Test sequences for the GSM Enhanced Full Rate (EFR) speech codec

3GPP TS 46.054 V8.0.0 (2008-12)
Technical Specification
3rd Generation Partnership Project;
Technical Specification Group Services and System Aspects;
Test sequences for the GSM Enhanced Full Rate (EFR)
speech codec
(Release 8)


 EMBED Word.Picture.6  	
The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.	 
The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.	 
This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification.
Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organizational Partners' Publications Offices.



Keywords
GSM, speech, codec

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Contents
 TOC \o "1-9" Foreword	 PAGEREF _Toc217158162 \h 4
1	Scope	 PAGEREF _Toc217158163 \h 5
2	References	 PAGEREF _Toc217158164 \h 5
3	Definitions and abbreviations	 PAGEREF _Toc217158165 \h 6
3.1	Definitions	 PAGEREF _Toc217158166 \h 6
3.2	Abbreviations	 PAGEREF _Toc217158167 \h 6
4	General	 PAGEREF _Toc217158168 \h 6
5	Test sequence format	 PAGEREF _Toc217158169 \h 6
5.1	File format	 PAGEREF _Toc217158170 \h 6
5.2	Codec homing	 PAGEREF _Toc217158171 \h 7
6	Speech codec test sequences	 PAGEREF _Toc217158172 \h 8
6.1	Codec configuration	 PAGEREF _Toc217158173 \h 8
6.2	Speech codec test sequences	 PAGEREF _Toc217158174 \h 8
6.2.1	Speech encoder test sequences	 PAGEREF _Toc217158175 \h 8
6.2.2	Speech decoder test sequences	 PAGEREF _Toc217158176 \h 9
6.2.3	Codec homing sequence	 PAGEREF _Toc217158177 \h 9
7	DTX test sequences	 PAGEREF _Toc217158178 \h 11
7.1	Codec configuration	 PAGEREF _Toc217158179 \h 11
7.2	DTX test sequences	 PAGEREF _Toc217158180 \h 11
7.2.1	Predictor values computation	 PAGEREF _Toc217158181 \h 12
7.2.2	Spectral comparison	 PAGEREF _Toc217158182 \h 12
7.2.3	Threshold adaptation	 PAGEREF _Toc217158183 \h 12
7.2.4	Periodicity detection	 PAGEREF _Toc217158184 \h 12
7.2.5	Tone detection	 PAGEREF _Toc217158185 \h 12
7.2.6	Safety and initialisation	 PAGEREF _Toc217158186 \h 12
7.2.7	Comfort noise test sequence	 PAGEREF _Toc217158187 \h 12
7.2.8	Real speech and tones	 PAGEREF _Toc217158188 \h 12
8	Sequences for finding the 20 ms framing of the GSM enhanced full rate speech encoder	 PAGEREF _Toc217158189 \h 13
8.1	Bit synchronisation	 PAGEREF _Toc217158190 \h 13
8.2	Frame synchronisation	 PAGEREF _Toc217158191 \h 14
8.3	Formats and sizes of the synchronisation sequences	 PAGEREF _Toc217158192 \h 14
9	Trau Testing with 8 Bit A- and µ-law PCM Test Sequences	 PAGEREF _Toc217158193 \h 15
10	Alternative Enhanced Full Rate implementation using the Adaptive Multi Rate 12.2 kbit/s mode	 PAGEREF _Toc217158194 \h 17
Annex A (informative):	Change History	 PAGEREF _Toc217158195 \h 19

Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
Test sequences for a bit exact implementation of the Enhanced Full Rate (EFR) speech transcoder are contained in the archive files which accompany the present document.
The archive contains ZIP compressed files, as follows:
Disk1_8	Clause 10: Test sequences for the GSM Enhanced Full Rate (EFR) speech codec; Speech test sequences TEST0.xxx to TEST8.xxx.
Disk2_8	Clause 10: Test sequences for the GSM Enhanced Full Rate (EFR) speech codec; Speech test sequences TEST09.xxx to TEST16.xxx.
Disk3_8	Clause 10: Test sequences for the GSM Enhanced Full Rate (EFR) speech codec; Speech test sequences TEST17.xxx to TEST20.xxx, Codec homing and synchronisation sequences.
Disk4_8	Clause 10: Test sequences for the GSM Enhanced Full Rate (EFR) speech codec; DTX test sequences.
Disk5_8 to	Clause 10: Test sequences for the GSM Enhance Full Rate (EFR) speech codec; 8 bit 
Disk8_8	A- and µ-law compressed test sequences for alternative TRAU testing.
amr122_efr	Test sequences for the GSM-EFR speech codec using the Adaptive Multi-Rate (AMR) speech codec mode MR122 (GSM 06.74)
The present document specifies the digital test sequences for the GSM enhanced full rate speech codect for the digital cellular telecommunications system.
The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x	the first digit:
1	presented to TSG for information;
2	presented to TSG for approval;
3	or greater indicates TSG approved document under change control.
y	the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.
z	the third digit is incremented when editorial only changes have been incorporated in the document.
1	Scope
The present document specifies the digital test sequences for the GSM enhanced full rate speech codec. These sequences test for a bit exact implementation of the enhanced full rate speech transcoder (GSM 06.60 [2]), Voice Activity Detection (GSM 06.82 [6]), comfort noise (GSM 06.62 [4]) and the discontinuous transmission (GSM 06.81 [5]).
2	References
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
References are either specific (identified by date of publication, edition number, version number, etc.) or non‑specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies.  In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]	GSM 01.04: "Digital cellular telecommunication system (Phase 2+); Abbreviations and acronyms".
[2]	GSM 06.60: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR) speech transcoding".
[3]	GSM 06.61: "Digital cellular telecommunications system (Phase 2+); Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels".
[4]	GSM 06.62: "Digital cellular telecommunications system (Phase 2+); Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".
[5]	GSM 06.81: "Digital cellular telecommunications system (Phase 2+); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels".
[6]	GSM 06.82: "Digital cellular telecommunications system (Phase 2+); Voice Activity Detection (VAD) for Enhanced Full Rate (EFR) speech traffic channels".
[7]	GSM 06.53: "Digital cellular telecommunications system (Phase 2+); ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec".
[8]	GSM 06.51: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR) speech coding functions; General description".
3	Definitions and abbreviations
3.1	Definitions
Definition of terms used in the present document can be found in GSM 06.60 [2], GSM 06.61 [3], GSM 06.62 [4], GSM 06.81 [5] and GSM 06.82 [6].
3.2	Abbreviations
For the purposes of the present document, the following abbreviations apply:
ETS	European Telecommunication Standard
GSM	Global System for Mobile communications
For abbreviations not given in this subclause see GSM 01.04 [1].
4	General
Digital test sequences are necessary to test for a bit exact implementation of the enhanced full rate speech transcoder (GSM 06.60 [2]), Digital test Voice Activity Detection (GSM 06.82 [6]), comfort noise (GSM 06.62 [4]) and the discontinuous transmission (GSM 06.81 [5]).
The test sequences may also be used to verify installations of the ANSI C code in GSM 06.53 [7].
Clause 5 describes the format of the files which contain the digital test sequences. Clause 6 describes the test sequences for the speech transcoder. Clause 7 describes the test sequences for the VAD, comfort noise and discontinuous transmission.
Clause 8 describes the method by which synchronisation is obtained between the test sequences and the speech codec under test.
Clause 9 describes the alternative acceptance testing of the speech encoder and decoder in the TRAU by means of 8 bit A- or μ-law compressed test sequences on the A-Interface.
Test sequences for an alternative and fully interoperable implementation using as a basis the 12.2 kbit/s mode of the Adaptive Multi Rate speech coder are described in section 10.
Electronic copies of the digital test sequences are provided as clause 10, these digital test sequences are contained in the archive ts_100725v080100p0.zip which accompanies the present document.
5	Test sequence format
This clause provides information on the format of the digital test sequences for the GSM enhanced full rate speech transcoder (GSM 06.60 [2]), Voice Activity Detection (GSM 06.82 [6]), comfort noise (GSM 06.62 [4]) and the discontinuous transmission (GSM 06.81 [5]).
5.1	File format
The test sequence files are provided in archive ts_100725v080100p0.zip which accompanies the present document.
Following decompression, four types of file are provided:
-	Files for input to the GSM enhanced full rate speech encoder:	*.INP
-	Files for comparison with the encoder output:						*.COD
-	Files for input to the GSM enhanced full rate speech decoder:	*.DEC
-	Files for comparison with the decoder output:						*.OUT
The *.DEC files are generated from the corresponding *.COD files.
Tables 1, 2, 3 and 4 define the formats of the four types of file.
Each speech parameter within the speech frame of 244 bits/20 ms is contained in a serial string of 16 bit words, where each word contains the value of one bit of the parameter. In each string of n 16 bit words containing the n bits of a parameter, the most significant bit of the parameter is written first, and the least significant bit is written last. The bit value contained in a single 16 bit word is either 0x0000 or 0x0001 (right justified) for the binary values of “0” and “1”, respectively. See table 6 of GSM 06.60 [2] for the order of occurrence and bit allocation of speech parameters within the speech frame of 244 bits/20 ms.
The samples in the encoder input signal and in the decoder output signal are left justified.
5.2	Codec homing
Each *.INP file includes two homing frames at the start of the test sequence. The function of these frames is to reset the speech encoder state variables to their initial value. In the case of a correct installation of the ANSI-C simulation (GSM 06.53 [7]), all speech encoder output frames shall be identical to the corresponding frame in the *.COD file. In the case of a correct hardware implementation undergoing testing, the first speech encoder output frame is undefined and need not be identical to the first frame in the *.COD file, but all remaining speech encoder output frames shall be identical to the corresponding frames in the *.COD file.
Each *.DEC file includes two homing frames at the start of the test sequence. The function of these frames is to reset the speech decoder state variables to their initial value. In the case of a correct installation of the ANSI-C simulation (GSM 06.53 [7]), all speech decoder output frames shall be identical to the corresponding frame in the *.OUT file. In the case of a correct hardware implementation undergoing testing, the first speech decoder output frame is undefined and need not be identical to first frame in the *.OUT file, but all remaining speech decoder output frames shall be identical to the corresponding frames in the *.OUT file.
Table 1: Encoder input sequence (*.INP) format
Name
Description
No. of bits
Justification
s(n)
Encoder input signal
13
Left

Table 2: Encoder output sequence (*.COD) format
Name
Description 
No. of bits
Justification
Speech parameters




SPEECH
Serial stream of speech parameter bits to the channel encoder

244

Right
Additional information



VAD
SP
Voice activity detection flag
SP flag
1
1
Right
Right

Table 3: Decoder input sequence (*.DEC) format
Name
Description 
No. of bits
Justification
Additional information



BFI
Bad Frame Indicator flag
1
Right
Speech parameters




SPEECH
Serial stream of speech parameter bits to the channel encoder

244

Right
Additional information



SID
TAF
Silence Descriptor flag
Time Alignment Flag
1
1
Right
Right

Table 4: Decoder output sequence (*.OUT) format
Name
Description
No. of bits
Justification
s'(n)
Decoder output signal
13
Left

6	Speech codec test sequences
This clause describes the test sequences designed to exercise the GSM enhanced full rate speech transcoder (GSM 06.60 [2]).
6.1	Codec configuration
The speech encoder shall be configured to operate in the non-DTX mode. The VAD and SP flags shall be set to 1 at the speech encoder output.
6.2	Speech codec test sequences
Table 5 lists the location and size of the speech codec test sequences.
6.2.1	Speech encoder test sequences
Twenty-one encoder input sequences are provided. Note that for the input sequences TEST0.INP to TEST3.INP, the amplitude figures are given in 13-bit precision. The active speech levels are given in dBov.
-	TEST0.INP - Synthetic harmonic signal. The pitch delay varies slowly from 18 to 143.5 samples. The minimum and maximum amplitudes are -997 and +971.
-	TEST1.INP - Synthetic harmonic signal. The pitch delay varies slowly from 144 down to 18.5 samples. Amplitudes at saturation point -4096 and +4095.
-	TEST2.INP - Sinusoidal sweep varying from 150 Hz to 3400 Hz. Amplitudes ± 1250.
-	TEST3.INP - Sinusoidal sweep varying from 150 Hz to 3400 Hz. Amplitudes ± 4000.
-	TEST4.INP - Female speech, active speech level: -19.4 dBov, flat frequency response.
-	TEST5.INP - Male speech, active speech level: -18.7 dBov, flat frequency response.
-	TEST6.INP - Female speech, ambient noise, active speech level: -35.0 dBov, flat frequency response.
-	TEST7.INP - Female speech, ambient noise, active speech level: -25.0 dBov, flat frequency response.
-	TEST8.INP - Female speech, ambient noise, active speech level: -15.6 dBov, flat frequency response.
-	TEST9.INP - Female speech, car noise, active speech level: -35.5 dBov, flat frequency response.
-	TEST10.INP - Female speech, car noise, active speech level: -26.1 dBov, flat frequency response.
-	TEST11.INP - Female speech, car noise, active speech level: -15.8 dBov, flat frequency response.
-	TEST12.INP - Male speech, ambient noise, active speech level: -34.9 dBov, flat frequency response.
-	TEST13.INP - Male speech, ambient noise, active speech level: -24.8 dBov, flat frequency response.
-	TEST14.INP - Male speech, ambient noise, active speech level: -15.0 dBov, flat frequency response.
-	TEST15.INP - Male speech, babble noise, active speech level: -34.1 dBov, flat frequency response.
-	TEST16.INP - Male speech, babble noise, active speech level: -24.3 dBov, flat frequency response.
-	TEST17.INP - Male speech, babble noise, active speech level: -14.4 dBov, flat frequency response.
-	TEST18.INP - Female speech, ambient noise, active speech level: -26.0 dBov, modified IRS frequency response, with many zero frames.
-	TEST19.INP - Male speech, ambient noise, active speech level: -36.0 dBov, modified IRS frequency response, with many zero frames.
-	TEST20.INP - Sequence for exercising the LPC vector quantisation codebooks and ROM tables of the codec.
The TEST0.INP and TEST1.INP sequences were designed to test the pitch lag of the GSM enhanced full rate speech encoder. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the TEST0.COD and TEST1.COD sequences, respectively. 
The TEST2.INP and TEST3.INP sequences are particularly suited for testing the LPC analysis, as well as for finding saturation problems. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the TEST2.COD and TEST3.COD sequences, respectively.
The TEST4.INP and TEST5.INP sequences contain a lot of low-frequency components. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the TEST4.COD and TEST5.COD sequences, respectively.
The TEST18.INP and TEST19.INP sequences contain some “all zeros” frames (silence) in between segments of speech. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the TEST18.COD and TEST19.COD sequences, respectively.
The TEST20.INP sequence was designed to force the encoder to select each of the LPC code indices and each but one of the the ROM table indices of the codec.
The remaining sequences (TEST6.INP to TEST17.INP) were selected on the basis of bringing various input characteristics (background noise) and levels to the test sequence set. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the TEST6.COD to TEST17.COD sequences, respectively.
6.2.2	Speech decoder test sequences
Twenty-one speech decoder input sequences TESTXX.DEC (XX = 0..20) are provided. These are derived from the corresponding TESTXX.INP sequences. In a correct implementation, the resulting speech decoder output shall be identical to the corresponding TESTXX.OUT sequences.
6.2.3	Codec homing sequence
In addition to the test sequences described above, two homing sequences are provided to assist in codec testing. TEST21.INP contains one encoder-homing-frame. TEST21.DEC contains one decoder-homing-frame. The use of these sequences is described in GSM 06.51 [8].
Table 5: Location and size of speech codec test sequences
Disk No.
File Name
No. of frames
Size (bytes)
1/8
1/8
1/8
1/8
TEST0.INP
TEST0.COD
TEST0.DEC
TEST0.OUT

285
91 200
140 220
140 790
91 200
1/8
1/8
1/8
1/8
TEST1.INP
TEST1.COD
TEST1.DEC
TEST1.OUT

285
91 200
140 220
140 790
91 200
1/8
1/8
1/8
1/8
TEST2.INP
TEST2.COD
TEST2.DEC
TEST2.OUT

402
128 640
197 784
198 588
128 640
1/8
1/8
1/8
1/8
TEST3.INP
TEST3.COD
TEST3.DEC
TEST3.OUT

402
128 640
197 784
198 588
128 640
1/8
1/8
1/8
1/8
TEST4.INP
TEST4.COD
TEST4.DEC
TEST4.OUT

301
96 320
148 092
148 694
96 320
1/8
1/8
1/8
1/8
TEST5.INP
TEST5.COD
TEST5.DEC
TEST5.OUT

224
71 680
110 208
110 656
71 680
1/8
1/8
1/8
1/8
TEST6.INP
TEST6.COD
TEST6.DEC
TEST6.OUT

335
107 200
164 820
165 490
107 200
1/8
1/8
1/8
1/8
TEST7.INP
TEST7.COD
TEST7.DEC
TEST7.OUT

363
116 160
178 596
179 322
116 160
1/8
1/8
1/8
1/8
TEST8.INP
TEST8.COD
TEST8.DEC
TEST8.OUT

340
108 800
167 280
167 960
108 800
2/8
2/8
2/8
2/8
TEST9.INP
TEST9.COD
TEST9.DEC
TEST9.OUT

407
130 240
200 244
201 058
130 240
2/8
2/8
2/8
2/8
TEST10.INP
TEST10.COD
TEST10.DEC
TEST10.OUT

383
122 560
188 436
189 202
122 560
2/8
2/8
2/8
2/8
TEST11.INP
TEST11.COD
TEST11.DEC
TEST11.OUT

367
117 440
180 564
181 298
117 440
2/8
2/8
2/8
2/8
TEST12.INP
TEST12.COD
TEST12.DEC
TEST12.OUT

298
95 360
146 616
147 212
95 360
2/8
2/8
2/8
2/8
TEST13.INP
TEST13.COD
TEST13.DEC
TEST13.OUT

338
108 160
166 296
166 972
108 160
2/8
2/8
2/8
2/8
TEST14.INP
TEST14.COD
TEST14.DEC
TEST14.OUT

318
101 760
156 456
157 092
101 760




(continued)
Table 5 (concluded): Location and size of speech codec test sequences
Disk No.
File Name
No. of frames
Size (bytes)
2/8
2/8
2/8
2/8
TEST15.INP
TEST15.COD
TEST15.DEC
TEST15.OUT

328
104 960
161 376
162 032
104 960
2/8
2/8
2/8
2/8
TEST16.INP
TEST16.COD
TEST16.DEC
TEST16.OUT

354
113 280
174 168
174 876
113 280
3/8
3/8
3/8
3/8
TEST17.INP
TEST17.COD
TEST17.DEC
TEST17.OUT

316
101 120
155 472
156 104
101 120
3/8
3/8
3/8
3/8
TEST18.INP
TEST18.COD
TEST18.DEC
TEST18.OUT

402
128 640
197 784
198 588
128 640
3/8
3/8
3/8
3/8
TEST19.INP
TEST19.COD
TEST19.DEC
TEST19.OUT

402
128 640
197 784
198 588
128 640
3/8
3/8
3/8
3/8
TEST20.INP
TEST20.COD
TEST20.DEC
TEST20.OUT

631
201 920
310 452
311 714
201 920
3/8
3/8
TEST21.INP
TEST21.DEC
1
320
494

7	DTX test sequences
This subclause describes the test sequences designed to exercise the VAD algorithm (GSM 06.82 [6]), comfort noise (GSM 06.62 [4]) and discontinuous transmission (GSM 06.81 [5]).
7.1	Codec configuration
The VAD, comfort noise and discontinuous transmission shall be tested in conjunction with the speech encoder (GSM 06.60 [2]). The speech encoder shall be configured to operate in the DTX mode defined in GSM 06.62 [4]. 
7.2	DTX test sequences
Each DTX test sequence consists of four files:
-	Files for input to the GSM enhanced full rate speech encoder:	*.INP
-	Files for comparison with the encoder output:						*.COD
-	Files for input to the GSM enhanced full rate speech decoder:	*.DEC
-	Files for comparison with the decoder output:						*.OUT
The *.DEC files are generated from the corresponding *.COD files.
In a correct implementation, the speech encoder parameters generated by the *.INP file shall be identical to those specified in the *.COD file; and the speech decoder output generated by the *.DEC file shall be identical to that specified in the *.OUT file.
Table 6 lists the DTX test sequences and their size in frames.
7.2.1	Predictor values computation
The computation of the predictor values described in GSM 06.82 [6] is not tested explicitly, since the results from the computation are tested many times via the spectral comparison and threshold adaptation tests.
7.2.2	Spectral comparison
The spectral comparison algorithm described in GSM 06.82 [6] is tested by the following test sequence:
-	DTX01. *
7.2.3	Threshold adaptation
The threshold adaptation algorithm described in GSM 06.82 [6] is tested by the following test sequence:
-	DTX02. *
7.2.4	Periodicity detection
The periodicity detection algorithm described in GSM 06.82 [6] is tested by the following test sequence:
-	DTX03. *
7.2.5	Tone detection
The tone detection algorithm described in GSM 06.82 [6] is tested by the following test sequence:
-	DTX04. *
7.2.6	Safety and initialisation
This sequence checks the safety paths used to prevent zero values being passed to the norm function.  It checks the functions described in the adaptive filtering and energy computation, and the prediction values computation given in GSM 06.82 [6]. This sequence also checks the initialisation of thvad and the rvad array:
-	DTX05. *
7.2.7	Comfort noise test sequence
The test sequences described in sub-subclauses 7.2.2 to 7.2.6 are designed to exercise the VAD described in GSM 06.82 [6] and the discontinuous transmission described in GSM 06.81 [5]. The following test sequence is defined to exercise the comfort noise algorithm described in GSM 06.62 [4]:
-	DTX06.*
7.2.8	Real speech and tones
The test sequences cannot be guaranteed to find every possible error.  There is therefore a small possibility that an incorrect implementation produces the correct output for the test sequences, but fails with real signals. Consequently, an extra sequence is included, which consists of very clean speech, barely detectable speech and a swept frequency tone:
-	DTX07. *
NOTE:	Some of the DTX test sequences contain homing frames. The DTX test sequences are therefore only suitable for testing a single transcoding.
Table 6: Location and size of DTX test sequences




size
(bytes)

Disk No.
File Name
No. of Frames
*.INP
*.COD
*.DEC
*.OUT
4/8
DTX01
710
227 200
349 320
350 740
227 200
4/8
DTX02
933
298 560
459 036
460 902
298 560
4/8
DTX03
156
49 920
76 752
77 064
49 920
4/8
DTX04
245
78 400
120 540
121 030
78 400
4/8
DTX05
56
17 920
27 552
27 664
17 920
4/8
DTX06
771
246 720
379 332
380 874
246 720
4/8
DTX07
1188
380 160
584 496
586 872
380 160

8	Sequences for finding the 20 ms framing of the GSM enhanced full rate speech encoder
When testing the decoder, alignment of the test sequences used to the decoder framing is achieved by the air interface (testing of MS) or can be reached easily on the Abis-interface (testing on network side).
When testing the encoder, usually there is no information available about where the encoder starts its 20 ms segments of speech input to the encoder.
In the following, a procedure is described to find the 20 ms framing of the encoder using special synchronisation sequences. This procedure can be used for MS as well as for network side.
Synchronisation can be achieved in two steps. First, bit synchronisation has to be found. In a second step, frame synchronisation can be determined. This procedure takes advantage of the codec homing feature of the enhanced full rate codec, which puts the codec in a defined home state after the reception of the first homing frame. On the reception of further homing frames, the output of the codec is predefined and can be triggered to.
8.1	Bit synchronisation
The input to the speech encoder is a series of 13 bit long words (104 kbits/s, 13 bit linear PCM). When starting to test the speech encoder, no knowledge is available on bit synchronisation, i.e., where the encoder expects its least significant bits, and where it expects the most significant bits.
The encoder homing frame consists of 160 samples, all set to zero with the exception of the least significant bit, which is set to one (0 0000 0000 0001 binary, or 0x0008 hex if written into 16 bit words left justified). If two such encoder homing frames are input to the encoder consecutively, the decoder homing frame is expected at the output as a reaction of the second encoder homing frame.
Since there are only 13 possibilities for bit synchronisation, after a maximum of 13 trials bit synchronisation can be reached. In each trial three consecutive encoder homing frames are input to the encoder. If the decoder homing frame is not detected at the output, the relative bit position of the three input frames is shifted by one and another trial is performed. As soon as the decoder homing frame is detected at the output, bit synchronisation is found, and the first step can be terminated.
The reason why three consecutive encoder homing frames are needed is that frame synchronisation is not known at this stage. To be sure that the encoder reads two complete homing frames, three frames have to be input. Wherever the encoder has its 20 ms segmentation, it will always read at least two complete encoder homing frames.
An example of the 13 different frame triplets is given in sequence BITSYNC.INP (see table 7).
8.2	Frame synchronisation
Once bit synchronisation is found, frame synchronisation can be found by inputting one special frame that delivers 160 different output frames, depending on the 160 different positions that this frame can possibly have with respect to the encoder framing.
This special synchronisation frame was found by taking one input frame and shifting it through the positions 0 to 159. The corresponding 160 encoded speech frames were calculated and it was verified that all 160 output frames were different. When shifting the input synchronisation frame, the samples at the beginning were set to 0x0008 hex, which corresponds to the samples of the encoder homing frame.
Before inputting this special synchronisation frame to the encoder, again the encoder has to be reset by one encoder homing frame. A second encoder homing frame is needed to provoke a decoder homing frame at the output that can be triggered to. And since the framing of the encoder is not known at that stage, three encoder homing frames have to precede the special synchronisation frame to ensure that the encoder reads at least two homing frames, and at least one decoder homing frame is produced at the output, serving as a trigger for recording.
The special synchronisation frame preceded by the three encoder homing frames are given in SEQSYNC.INP. The corresponding 160 different output frames are given in SYNC000.COD through SYNC159.COD. The three digit number in the filename indicates the number of samples by which the input was retarded with respect to the encoder framing. By a corresponding shift in the opposite direction, alignment with the encoder framing can be reached.
8.3	Formats and sizes of the synchronisation sequences
BIT SYNC.INP:
This sequence consists of 13 frame triplets. It has the format of the speech encoder input test sequences (13 bit left justified with the three least significant bits set to zero). 
The size of it is therefore:
	SIZE (BITSYNC.INP) = 13 * 3 * 160 * 2 bytes = 12480 bytes
SEQSYNC.INP:
This sequence consist of 3 encoder reset frames and the special synchronisation frame. It has the format of the speech encoder input test sequences (13 bit left justified with the three least significant bits set to zero). 
The size of it is therefore:
	SIZE (SEQSYNC.INP) = 4 * 160 * 2 bytes = 1280 bytes
SYNCXXX.COD:
These sequences consists of 1 encoder output frame each. They have the format of the speech encoder output test sequences (16 bit words right justified). The values of the VAD and SP flags are set to one in these files.
The size of them is therefore:
	SIZE (SYNCXXX.COD) = (244 + 2) * 2 bytes = 492 bytes
Table 7 summarises this information.
Table 7: Location, size and justification of synchronisation sequences
Disk No.
Purpose of Sequence
Name of Sequence
No. of Frames
Size in Bytes
Justification    
3/8
Bit Synchronisation
BITSYNC.INP
39
1 2480
Left
3/8
Frame Synchronisation (input)
SEQSYNC.INP
4
1 280
Left
3/8
3/8
3/8
"
"
"
3/8
Frame Synchronisation (output)
SYNC000.COD
SYNC001.COD
SYNC002.COD
"
"
"
SYNC159.COD
1
1
1
"
"
"
1
492
492
492
"
"
"
492
Right
Right
Right
"
"
"
Right

9	Trau Testing with 8 Bit A- and µ-law PCM Test Sequences
In the previous clauses, tests for the  transcoder in the TRAU are described, using 13 bit linear test sequences. However, these 13 bit test sequences require a special interface in the TRAU and do not allow testing in the field. In most cases the TRAU has to be set in special mode before testing. 
As an alternative, the speech codec tests in the TRAU can be performed using A- or μ-law compressed 8 bit PCM test sequences on the A interface. For this purpose modified input test sequences (*-X.INP) are generated from the original sequences by A or μ law compression. As an input to the encoder they result in modified encoder output sequences (*-X.COD). The same  *.dec decoder input sequences as in subclause 6.2.2. are then used to produce the  output sequences *-X.OUT, which are A- or µ compressed.
The A- and µ-law compression and decompression does not change the homing frames at the encoder input. The format of all A- and μ-law PCM files *-X.INP and *-X.OUT is one sample (8 bit) per byte. The format of all other files is as described in clause 5.
All files are contained in archive ts_100725v080100p0.zip which accompanies the present document. The ‘X’ in the tables below with the filenames stands for A (A-law) and U (μ-law), respectively. The decoder input files *.dec are the same as in table 5 and are not described in this clause.
Table 8: Location and size of compressed 8 bit PCM speech codec test sequences
Disk No.
File Name
No. of frames
Size (bytes)
5-8/8
5-8/8
5-8/8
TEST0-X.INP
TEST0-X.COD
TEST0-X.OUT

285
45 600
140 220
45 600
5-8/8
5-8/8
5-8/8
TEST1-X.INP
TEST1-X.COD
TEST1-X.OUT

285
45 600
140 220
45 600
5-8/8
5-8/8
5-8/8
TEST2-X.INP
TEST2-X.COD
TEST2-X.OUT

402
64 320
197 784
64 320
5-8/8
5-8/8
5-8/8
TEST3-X.INP
TEST3-X.COD
TEST3-X.OUT

402
64 320
197 784
64 320
5-8/8
5-8/8
5-8/8
TEST4-X.INP
TEST4-X.COD
TEST4-X.OUT

301
48 160
148 092
48 160
5-8/8
5-8/8
5-8/8
TEST5-X.INP
TEST5-X.COD
TEST5-X.OUT

224
35 840
110 208
35 840
5-8/8
5-8/8
5-8/8
TEST6-X.INP
TEST6-X.COD
TEST6-X.OUT

335
53 600
164 820
53 600
5-8/8
5-8/8
5-8/8
TEST7-X.INP
TEST7-X.COD
TEST7-X.OUT

363
58 080
178 596
58 080
5-8/8
5-8/8
5-8/8
TEST8-X.INP
TEST8-X.COD
TEST8-X.OUT

340
54 400
167 280
54 400
5-8/8
5-8/8
5-8/8
TEST9-X.INP
TEST9-X.COD
TEST9-X.OUT

407
65 120
200 244
65 120
5-8/8
5-8/8
5-8/8
TEST10-X.INP
TEST10-X.COD
TEST10-X.OUT

383
61 280
188 436
61 280
5-8/8
5-8/8
5-8/8
TEST11-X.INP
TEST11-X.COD
TEST11-X.OUT

367
58 720
180 564
58 720
5-8/8
5-8/8
5-8/8
TEST12-X.INP
TEST12-X.COD
TEST12-X.OUT

298
47 680
146 616
47 680
5-8/8
5-8/8
5-8/8
TEST13-X.INP
TEST13-X.COD
TEST13-X.OUT

338
54 080
166 296
54 080
5-8/8
5-8/8
5-8/8
TEST14-X.INP
TEST14-X.COD
TEST14-X.OUT

318
50 880
156 456
50 880
5-8/8
5-8/8
5-8/8
TEST15-X.INP
TEST15-X.COD
TEST15-X.OUT

328
52 480
161 376
52 480
5-8/8
5-8/8
5-8/8
TEST16-X.INP
TEST16-X.COD
TEST16-X.OUT

354
56 640
174 168
56 640
5-8/8
5-8/8
5-8/8
TEST17-X.INP
TEST17-X.COD
TEST17-X.OUT

316
50 560
155 472
50 560
5-8/8
5-8/8
5-8/8
TEST18-X.INP
TEST18-X.COD
TEST18-X.OUT

402
64 320
197 784
64 320
5-8/8
5-8/8
5-8/8
TEST19-X.INP
TEST19-X.COD
TEST19-X.OUT

402
64 320
197 784
64 320
5-8/8
5-8/8
5-8/8
TEST20-X.INP
TEST20-X.COD
TEST20-X.OUT

631
100 960
310 452
100 960
5-8/8
TEST21-X.INP
1
160

Table 9: Location and size of compressed 8 bit PCM DTX test sequences




size
bytes
Disk No.
File Name
No. of Frames
*.INP
*.COD
*.OUT
5-8/8
DTX01-X
710
113 600
349 320
113 600
5-8/8
DTX02-X
933
149 280
459 036
149 280
5-8/8
DTX03-X
156
24 960
76 752
24 960
5-8/8
DTX04-X
245
39 200
120 540
39 200
5-8/8
DTX05-X
56
8 960
27 552
8 960
5-8/8
DTX06-X
771
123 360
379 332
123 360
5-8/8
DTX07-X
1188
190 080
584 496
190 080

In addition to the test sequences above, special input (seqsyncX.inp) and output (syncxxxX.cod) sequences for frame synchronization are provided. The X again stands for A and μ law compressed PCM. The synchronization procedure is described in clause 8.
Table 10: Location, size and justification of compressed 8 bit PCM test sequences
Disk No.
Purpose of Sequence
Name of Sequence
No. of Frames
Size in Bytes
Justification    
5-8/8
Frame Synchronisation (input)
SEQSYNCX.INP
4
640
-
5-8/8
5-8/8
5-8/8
"
"
"
5-8/8
Frame Synchronisation (output)
SYNC000X.COD
SYNC001X.COD
SYNC002X.COD
"
"
"
SYNC159X.COD
1
1
1
"
"
"
1
492
492
492
"
"
"
492
Right
Right
Right
"
"
"
Right

5-8/8
5-8/8
5-8/8
"
"
"
5-8/8
Frame Synchronisation (output)
SYNC000X.COD
SYNC001X.COD
SYNC002X.COD
"
"
"
SYNC159X.COD
1
1
1
"
"
"
1
492
492
492
"
"
"
492
Right
Right
Right
"
"
"
Right

10	Alternative Enhanced Full Rate implementation using the Adaptive Multi Rate 12.2 kbit/s mode
The 12.2 kbit/s mode of the Adaptive Multi Rate speech coder described in TS 26.071 is functionally equivalent to the GSM Enhanced Full Rate speech coder. An alternative implementation of the Enhanced Full Rate speech service based on the 12.2 kbit/s mode of the Adaptive Multi Rate coder is allowed. Alternative implementations shall implement the functionality specified in TS 26.071 for the 12.2 kbit/s mode, with the difference that the DTX transmission format from GSM 06.81, the comfort noise generation from GSM 06.62 and the decoder homing frame from GSM 06.60 shall be used.
The test sequences are derived from the corresponding AMR test sequences. The modifications that were made and the use of the respective sequences are described below. The input sequences are identical to the AMR test input sequences *.inp.
Speech codec test sequences
with DTX disabled 
             t00.inp ... t22.inp (encoder input, from TS 26.074)
             t00_efr.cod ... t22_efr.cod (encoder output)
             t00_efr.dec ... t22_efr.dec (decoder input)
             t00_efr.out ... t22_efr.out (decoder output)
             
with DTX enabled, VAD option 1
             Dtx1.inp ... Dtx4.inp (encoder input, from TS 26.074)
             Dtx1_efr.cod ... Dtx4_efr.cod (encoder output)
             Dtx1_efr.dec ... Dtx4_efr.dec (decoder input)
             Dtx1_efr.out ... Dtx4_efr.out (decoder output)
             
with DTX enabled, VAD option 2
             Dt21.inp .... Dt24.inp (encoder input, from TS 26.074)
             Dt21_efr.cod ... Dt24_efr.cod (encoder output)
             Dt21_efr.dec ... Dt24_efr.dec (decoder input)
             Dt21_efr.out ... Dt24_efr.out (decoder output)
The format of the *.cod files is identical to the GSM_EFR *.cod file format (244 Data Bits, VadFlag, SpFlag equaling 246 Words per 20ms frame). The format of the *.dec files is identical to the GSM_EFR *.dec file format, that is (Bfi, 244 Data Bits, Sid, Taf equaling 247 Words per frame (20ms).
In summary, the differences to the AMR Mode MR122 test sequences are:
DTX handling (VadFlag and SpFlag instead of TxType; different SID frames)
Decoder homing frame (Decoder homing frame for GSM_EFR is different than for AMR MR122).

Annex A (informative):
Change History

Change history
SMG No.
TDoc. No.
CR. No.
Section affected
New version
Subject/Comments
SMG#23



4.0.1
ETSI Publication
SMG#23



5.1.0
Release 1996 version
SMG#27



6.0.0
Release 1997 version
SMG#29



7.0.0
Release 1998 version




7.0.1
Version update to 7.0.1 for Publication
SMG#31



8.0.0
Release 1999 version
SMG#32
P-00-274
A006
4 and new 10
8.1.0
Alternative EFR implementation using the AMR 12.2 mode


Change history
DateTSG SA#TSG Doc.CRRevSubject/CommentOldNew12-200010SP-000573A011Correction to the test vectors of the alternative EFR version8.1.08.2.003-200111Version for Release 44.0.006-200216Version for Release 54.0.05.0.012-200426Version for Rejlease 65.0.06.0.006-200736Version for Release 76.0.07.0.012-200842Version for Release 87.0.08.0.0




















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 STYLEREF ZGSM Release 8


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