Test sequences for the GSM half rate speech codec

3GPP TS 46.007 V9.0.0 (2009-12)
Technical Specification
3rd Generation Partnership Project;
Technical Specification Group Services and System Aspects;
Half rate speech;
Test sequences for the GSM half rate speech codec
(Release 9)


 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, codec, speech, testing

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Contents
 TOC \o "1-9" Foreword	 PAGEREF _Toc248306882 \h 4
1	Scope	 PAGEREF _Toc248306883 \h 6
2	References	 PAGEREF _Toc248306884 \h 6
3	Definitions and abbreviations	 PAGEREF _Toc248306885 \h 6
3.1	Definitions	 PAGEREF _Toc248306886 \h 6
3.2	Abbreviations	 PAGEREF _Toc248306887 \h 7
4	General	 PAGEREF _Toc248306888 \h 7
5	Test sequence format	 PAGEREF _Toc248306889 \h 7
5.1	File format	 PAGEREF _Toc248306890 \h 7
5.2	Codec homing	 PAGEREF _Toc248306891 \h 8
6	Speech codec test sequences	 PAGEREF _Toc248306892 \h 8
6.1	Codec configuration	 PAGEREF _Toc248306893 \h 8
6.2	Speech codec test sequences	 PAGEREF _Toc248306894 \h 9
6.2.1	Speech encoder test sequences	 PAGEREF _Toc248306895 \h 9
6.2.2	Speech decoder test sequences	 PAGEREF _Toc248306896 \h 9
6.2.3	Codec homing sequence	 PAGEREF _Toc248306897 \h 9
7	DTX test sequences	 PAGEREF _Toc248306898 \h 10
7.1	Codec configuration	 PAGEREF _Toc248306899 \h 10
7.2	DTX test sequences	 PAGEREF _Toc248306900 \h 10
7.2.1	Predictor values computation	 PAGEREF _Toc248306901 \h 10
7.2.2	Spectral comparison	 PAGEREF _Toc248306902 \h 11
7.2.3	Threshold adaptation	 PAGEREF _Toc248306903 \h 11
7.2.4	Periodicity detection	 PAGEREF _Toc248306904 \h 11
7.2.5	Tone detection	 PAGEREF _Toc248306905 \h 11
7.2.6	Safety and initialization	 PAGEREF _Toc248306906 \h 11
7.2.7	Comfort noise test sequence	 PAGEREF _Toc248306907 \h 11
7.2.8	Real speech and tones	 PAGEREF _Toc248306908 \h 11
8	Sequences for finding the 20 ms framing of the GSM half rate speech encoder	 PAGEREF _Toc248306909 \h 12
8.1	Bit synchronization	 PAGEREF _Toc248306910 \h 12
8.2	Frame synchronization	 PAGEREF _Toc248306911 \h 12
8.3	Formats and sizes of the synchronization sequences	 PAGEREF _Toc248306912 \h 13
9	Trau Testing with 8 Bit A- and µ-law PCM Test Sequences	 PAGEREF _Toc248306913 \h 14
10	Test sequences for the GSM half rate speech codec	 PAGEREF _Toc248306914 \h 15
Annex A (informative):	Change history	 PAGEREF _Toc248306915 \h 16

Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
An electronic attachment accompanies the present document, containing test sequences for a bit exact implementation of the half rate speech transcoder.
Archive en_300968v080001p0.ZIP which accompanies the present document contains compressed files which are labelled as follows:
Disks24.zip	Clause 10: Test sequences for the GSM half rate speech codec; Disks 2 and 4 (GSM 06.07).
Disks135.zip	Clause 10: Test sequences for the GSM half rate speech codec; Disks 1, 3 and 5 (GSM 06.07).
Disks6A.zip	Clause 10: Test sequences for the GSM half rate speech codec; Disks 6 and 10 (GSM 06.07).
Disks7B.zip	Clause 10: Test sequences for the GSM half rate speech codec; Disks 7 and 11 (GSM 06.07).
Disks89.zip	Clause 10: Test sequences for the GSM half rate speech codec; Disks 8 and 9 (GSM 06.07).
The present document specifies the half rate speech traffic channels for the Digital cellular telecommunications system.
The present document specifies the digital test sequences for the GSM half rate speech codec for the digital cellular telecommunications system. The present document, is part of a series covering the half rate speech traffic channels as described below:
GSM 06.02	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speech processing functions".
GSM 06.06	"Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI‑C code for the GSM half rate speech codec".
GSM 06.07	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Test sequences for the GSM half rate speech codec".
GSM 06.20	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speech transcoding".
GSM 06.21	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels".
GSM 06.22	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfort noise aspects for half rate speech traffic channels".
GSM 06.41	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels".
GSM 06.42	"Digital cellular telecommunications system (Phase 2+); Half rate speech; Voice Activity Detector (VAD) for half rate speech traffic channels".
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 half rate speech codec. These sequences test for a bit exact implementation of the half rate speech transcoder (GSM 06.20 [2]), Voice Activity Detector (GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and the discontinuous transmission (GSM 06.41 [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 telecommunications system (Phase 2+); Abbreviations and acronyms".
[2]	GSM 06.20: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speech transcoding".
[3]	GSM 06.21: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Substitution and muting of lost frame for half rate speech traffic channels".
[4]	GSM 06.22: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfort noise aspects for half rate speech traffic channels".
[5]	GSM 06.41: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels".
[6]	GSM 06.42: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Voice Activity Detector (VAD) for half rate speech traffic channels".
[7]	GSM 06.06: "Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI‑C code for the GSM half rate speech codec".
[8]	GSM 06.02: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speech coding functions".
3	Definitions and abbreviations
3.1	Definitions
Definition of terms used in the present document can be found in GSM 06.20 [2], GSM 06.21 [3], GSM 06.22 [4], GSM 06.41 [5] and GSM 06.42 [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 clause, see GSM 01.04 [1].
4	General
Digital test sequences are necessary to test for a bit exact implementation of the half rate speech transcoder (GSM 06.20 [2]), Voice Activity Detector (GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and the discontinuous transmission (GSM 06.41 [5]).
The test sequences may also be used to verify installations of the ANSI C code in GSM 06.06 [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 synchronization is obtained between the test sequences and the speech codec under test.
Clause 9 describes the optional 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.
Electronic copies of the digital test sequences are provided as clause 10, these digital test sequences are contained in archive en_300968v080001p0.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 half rate speech transcoder (GSM 06.20 [2]), Voice Activity Detector (GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and the discontinuous transmission (GSM 06.41 [5]).
5.1	File format
The test sequence files are provided in archive en_300968v080001p0.ZIP which accompanies the present document.
Following decompression, by execution of the 11 "disk*.exe" files, four types of file are provided:
‑	Files for input to the GSM half rate speech encoder:	*.INP
‑	Files for comparison with the encoder output:	*.COD
‑	Files for input to the GSM half rate speech decoder:	*.DEC
‑	Files for comparison with the decoder output:	*.OUT
Tables 1, 2, 3 and 4 define the formats of the four types of file. Each parameter in these tables is contained in a 16 bit word except for the samples of the 8 bit PCM test sequences, which are contained in an 8 bit word each. The left or right justification is indicated in the tables. The size and location of speech parameters in the encoder output (*.COD) and decoder input files (*.DEC) are described in GSM 06.20 [2].
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 06.06 [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 type approval, 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 06.06 [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 type approval, 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 words
Justification
Speech
Speech parameters to the channel encoder
18
 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/words
Justification
Speech parameters
Speech parameters to the channel encoder
18 words
 Right
BFI flag
UFI flag
SID flag
TAF flag
Bad Frame Indicator
Unreliable Frame Indicator
SIlence Descriptor
Time Alignment Flag
1 bit / 1 word
1 bit / 1 word
2 bits / 1 word
1 bit / 1 word
Right
Right
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 half rate speech transcoder (GSM 06.20 [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
Three encoder input sequences are provided:
‑	SEQ01.INP ‑ Sequence for exercising the LPC vector quantization codebooks;
‑	SEQ02.INP ‑ Sequence for exercising the long term predictor codebooks;
‑	SEQ03.INP ‑ Sequence for exercising the remaining excitation codebooks.
The SEQ01.INP sequence causes the GSM half rate speech encoder to select every vector in the three reflection coefficient vector quantizers at least once. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the SEQ01.COD sequence.
The SEQ02.INP sequence causes the encoder to select at least once every quantization level in the eight bit table of long term filter lags for the first subframe, and every quantization level in the four bit delta lag quantizer for subframes 2, 3, and 4. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the SEQ02.COD sequence.
The SEQ03.INP sequence causes the encoder to select each of the quantization levels at least once for the remaining GSM half rate speech coder parameters: R0 (frame energy), the soft interpolation decision for the LPC coefficients, the four voicing modes, the gain vectors (GSP0) for each of the voicing modes, and the voiced and unvoiced VSELP codebooks. The only exception to this is that two GSP0 levels in the unvoiced mode are not selected. However, these levels are exercised in the GSM half rate speech decoder as described below. In a correct implementation, the resulting speech encoder output parameters shall be identical to those specified in the SEQ03.COD sequence.
6.2.2	Speech decoder test sequences
Four speech decoder input sequences are provided:
‑	SEQ01.DEC;
‑	SEQ02.DEC;
‑	SEQ03.DEC;
‑	SEQ04.DEC.
The SEQ01.DEC, SEQ02.DEC, and SEQ03.DEC sequences test the operation of the GSM half rate speech decoder in the absence of channel errors. They are derived from the corresponding SEQXX.INP sequences. In a correct implementation, the resulting speech decoder output shall be identical to the SEQ01.OUT, SEQ02.OUT, and SEQ03.OUT sequences, respectively. Together, these three sequences exercise every quantization level in every codebook in the decoder, with the exception of two GSP0 levels in the unvoiced mode.
The SEQ04.DEC sequence is designed to test the GSM half rate speech decoder under conditions which can result from channel errors. In particular, it is the decoding of LTP lags at the lag table boundaries, given delta lag codes which if incorrectly decoded would point outside the eight bit lag table, that is being tested. Also, the two remaining GSP0 levels in the unvoiced mode are exercised by this sequence. In a correct implementation, the resulting speech decoder output shall be identical to the SEQ04.OUT sequence.
6.2.3	Codec homing sequence
In addition to the test sequences described above, two homing sequences are provided to assist in codec type approval testing. SEQ05.INP contains one encoder‑homing‑frame. SEQ05.DEC contains one decoder‑homing‑frame. The use of these sequences is described in GSM 06.02 [8].
Table 5: Location and size of speech codec test sequences
Disk No.
File Name
No. of frames
Size (bytes)
1
1
2
2
SEQ01.INP
SEQ01.COD
SEQ01.DEC
SEQ01.OUT

2 359
754 880
94 360
103 796
754 880
1
1
2
2
SEQ02.INP
SEQ02.COD
SEQ02.DEC
SEQ02.OUT

781
249 920
31 240
34 364
249 920
1
1
2
2
SEQ03.INP
SEQ03.COD
SEQ03.DEC
SEQ03.OUT

413
132 160
16 520
18 172
132 160
2
2
SEQ04.DEC
SEQ04.OUT
76

3 344
24 320
1
2
SEQ05.INP
SEQ05.DEC
1
320
44

7	DTX test sequences
This clause describes the test sequences designed to exercise the VAD algorithm (GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and discontinuous transmission (GSM 06.41 [5]).
7.1	Codec configuration
The VAD, comfort noise and discontinuous transmission shall be tested in conjunction with the speech encoder [2]). The speech encoder shall be configured to operate in the DTX mode defined in GSM 06.22 [4].
7.2	DTX test sequences
Each DTX test sequence consists of four files:
‑	Files for input to the GSM half rate speech encoder:	*.INP
‑	Files for comparison with the encoder output	*.COD
‑	Files for input to the GSM half 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 06.42 [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 06.42 [6] is tested by the following test sequence:
‑	DTX01.*
7.2.3	Threshold adaptation
The threshold adaptation algorithm described in GSM 06.42 [6] is tested by the following test sequence:
‑	DTX02.*
7.2.4	Periodicity detection
The periodicity detection algorithm described in GSM 06.42 [6] is tested by the following test sequence:
‑	DTX03.*
7.2.5	Tone detection
The tone detection algorithm described in GSM 06.42 [6] is tested by the following test sequence:
‑	DTX04.*
7.2.6	Safety and initialization
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 06.42 [6]. This sequence also checks the initialization of thvad and the rvad array:
‑	DTX05.*
7.2.7	Comfort noise test sequence
The test sequences described in sub‑clauses 7.2.2 to 7.2.6 are designed to exercise the VAD described in GSM 06.42 [6] and the discontinuous transmission described in GSM 06.41 [5]. The following test sequence is defined to exercise the comfort noise algorithm described in GSM 06.22 [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
3
DTX01
460
147 200
18 400
20 240
147 200
3
DTX02
886
283 520
35 440
38 984
283 520
3
DTX03
125
40 000
5 000
5 500
40 000
3
DTX04
317
101 440
12 680
13 948
101 440
3
DTX05
37
11 840
1 480
1 628
11 840
4
DTX06
240
76 800
9 600
10 560
76 800
4
DTX07
1 188
380 160
47 520
52 272
380 160

8	Sequences for finding the 20 ms framing of the GSM half 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 synchronization sequences. This procedure can be used for MS as well as for network side.
Synchronization can be achieved in two steps. First, bit synchronization has to be found. In a second step, frame synchronization can be determined. This procedure takes advantage of the codec homing feature of the half 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 synchronization
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 synchronization, 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 synchronization, after a maximum of 13 trials bit synchronization 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 synchronization is found, and the first step can be terminated.
The reason why three consecutive encoder homing frames are needed is that frame synchronization 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 synchronization
Once bit synchronization is found, frame synchronization 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 synchronization 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 synchronization 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 synchronization 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 synchronization 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 synchronization 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 synchronization 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 consists of 3 encoder reset frames and the special synchronization 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) = (18 + 2) * 2 bytes = 40 bytes
Table 7 summarizes this information.
Table 7: Location, size and justification of synchronization sequences
Disk No.
Purpose of Sequence
Name of Sequence
No. of Frames
Size in Bytes
Justification
5
Bit Synchronization
BITSYNC.INP
39
1 2480
Left
5
Frame Synchronization (input)
SEQSYNC.INP
4
1 280
Left
5
Frame Synchronization (output)
SYNC000.COD
SYNC001.COD
SYNC002.COD
"
"
"
SYNC159.COD
1
1
1
"
"
"
1
40
40
40
"
"
"
40
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 option, the speech codec tests can be performed with A/μ law compressed 8 bit PCM test sequences on the A interface. These 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 clause 6.2.2. are then used to produce the output sequences *-X.OUT, which are A- or µ-law 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 provided in archive en_300968v080001p0.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)
6/7
6/7
6/7
SEQ01-X.INP
SEQ01-X.COD
SEQ01-X.OUT

2 359
377 440 
94 360
377 440
6/7
6/7
6/7
SEQ02-X.INP
SEQ02-X.COD
SEQ02-X.OUT

781
124 960
31 240
124 960
6/7
6/7
6/7
SEQ03-X.INP
SEQ03-X.COD
SEQ03-X.OUT

413
66 080 
16 520
66 080
6/7
SEQ04-X.OUT
76
12 160 
6/7
SEQ05-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
8/9
DTX01-X
460
73 600
18 400
73 600
8/9
DTX02-X
886
141 760
35 440
141 760
8/9
DTX03-X
125
20 000
5 000
20 000
8/9
DTX04-X
317
 50 720
12 680
50 720
8/9
DTX05-X
37
5 920
1 480
5 920
8/9
DTX06-X
240
38 400
9 600
38 400
8/9
DTX07-X
1 188
190 080
47 520
190 080

In addition to the testsequences 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 compressed8 bit PCM test sequences
Disk No.
Purpose of Sequence
Name of Sequence
No. of Frames
Size in Bytes
Justification
10/11
Frame Synchronization (input)
SEQSYNCX.INP
4
640
-
10/11
Frame Synchronization (output)
SYNC000X.COD
SYNC001X.COD
SYNC002X.COD
"
"
"
SYNC159X.COD
1
1
1
"
"
"
1
40
40
40
"
"
"
40
Right
Right
Right
"
"
"
Right

10	Test sequences for the GSM half rate speech codec
NOTE:	This clause is contained in archive en_300968v080001p0.ZIP which accompanies the present document.
Annex A (informative):
Change history

Change history
SMG No.
TDoc. No.
CR. No.
Section affected
New version
Subject/Comments
SMG#16



4.0.3
ETSI Publication
SMG#20



5.0.1
Release 1996 version
SMG#23
97-737
A003

5.1.1
UAP60 and Supplementary notes on 06.06 Call Graph Changes
SMG#27



6.0.0
Release 1997 version
SMG#28



6.0.1
ETSI Publication
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




8.0.1
Update to Version 8.0.1 for Publication


Change history
DateTSG #TSG Doc.CRRevSubject/CommentOldNew03-200111Version for Release 44.0.006-200216Version for Release 54.0.05.0.012-200426Version for Release 65.0.06.0.006-200736Version for Release 76.0.07.0.012-200842Version for Release 87.0.08.0.012-200946Version for Release 98.0.09.0.0




















 STYLEREF ZA 3GPP TS 46.007 V9.0.0 (2009-12)
 PAGE 3
 STYLEREF ZGSM Release 9


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