文件列表:

c-code\acelp.h (30419, 2016-02-22)
c-code\agc2.c (2338, 2015-08-12)
c-code\autocorr.c (2482, 2015-08-12)
c-code\az_isp.c (11758, 2015-08-12)
c-code\basic_op.h (3898, 2015-08-12)
c-code\basicop2.c (109627, 2015-08-12)
c-code\bits.c (13379, 2015-08-12)
c-code\bits.h (2580, 2015-08-12)
c-code\c2t64fx.c (11253, 2015-08-12)
c-code\c4t64fx.c (36203, 2015-08-12)
c-code\cnst.h (3304, 2015-08-12)
c-code\cod_main.c (63995, 2016-02-22)
c-code\cod_main.h (3386, 2015-08-12)
c-code\coder.c (10694, 2015-08-12)
c-code\convolve.c (1334, 2015-08-12)
c-code\cor_h_x.c (2316, 2015-08-12)
c-code\count.c (7059, 2015-08-12)
c-code\count.h (4928, 2015-08-12)
c-code\d_gain2.c (11448, 2015-08-12)
c-code\d2t64fx.c (2053, 2015-08-12)
c-code\d4t64fx.c (5750, 2015-08-12)
c-code\dec_main.c (42029, 2015-08-12)
c-code\dec_main.h (2663, 2015-08-12)
c-code\decim54.c (7816, 2015-08-12)
c-code\decoder.c (9150, 2015-08-12)
c-code\deemph.c (3615, 2015-08-12)
c-code\dtx.c (42433, 2015-08-12)
c-code\dtx.h (5093, 2015-08-12)
c-code\g_pitch.c (2143, 2015-08-12)
c-code\gpclip.c (4791, 2016-02-22)
c-code\grid100.tab (1952, 2015-08-12)
c-code\ham_wind.tab (3732, 2015-08-12)
c-code\homing.c (3480, 2015-08-12)
c-code\homing.tab (2930, 2015-08-12)
c-code\hp_wsp.c (5449, 2015-08-12)
c-code\hp400.c (4077, 2015-08-12)
c-code\hp50.c (4059, 2015-08-12)
c-code\hp6k.c (1897, 2015-08-12)
c-code\hp7k.c (1663, 2015-08-12)
c-code\int_lpc.c (1469, 2015-08-12)
... ...

==================================================================================== AMR Wideband Codec 3GPP TS26.173 / ITU-T G.722.2, Mar 20, 2007. Version 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.1.0, 13.0.0, 13.1.0, 14.0.0, 14.1.0, 15.0.0 ==================================================================================== These files represent the 3GPP/ITU AMR WB Speech Coder Bit-Exact C simulation. All code is written in ANSI-C. The system is implemented as two separate programs: coder Speech Encoder decoder Speech Decoder For encoding using the coder program, the input is a binary speech file (*.inp) and the output is a binary encoded parameter file (*.cod). For decoding using the decoder program, the input is a binary parameter file (*.cod) and the output is a binary synthesized speech file (*.out). FILE FORMATS: ============= The file format of the supplied binary data (*.inp, *.cod, *.out) is 16-bit binary data which is read and written in 16 bit words. The data is therefore platform DEPENDENT. The files contain only data, i.e., there is no header. The test files included in this package are "PC" format, meaning that the least signification byte of the 16-bit word comes first in the files. If the software is to be run on some other platform than PC, such as an HP (HP-UX) or a Sun, then binary files will need to be modified by swapping the byte order in the files. The input (*.inp) and output files (*.out) are 16-bit signed binary files with 16 kHz sampling rate with no headers. The Speech Encoder produces bitstream files which are as follows: For every 20 ms input speech frame, the encoded bitstream using default format or ITU format contains the following data: Using default format: Word16 TXRXFLAG Word16 FrameType Word16 Mode Word16 1st Databit Word16 2nd DataBit . . . Word16 Nth DataBit Using ITU format: Word16 SyncWord Word16 DataLen Word16 1st Databit Word16 2nd DataBit . . . Word16 Nth DataBit where the TXRXFLAG tells whether the frame is input from the speech encoder or from the output of the channel decoder. For Speech encoder the Flag is 0x6B21 and for channel decoder the flag is 0x6B20 The frametype tells whether the frame is speech, SID_FIRST, SID_UPDATE etc. The frame types are the same than used in the existing ETSI AMR narrow band codec. For more details on these frametype, refer to the AMR NB documentation. The mode can be from 0 to 8, corresponding bit rated from 6.6 kbit/s to 23.85 kbit/s. Finally, there is N databits where the N is the number of bits per frame for each mode. So for 6.6 kbit/s mode, there are 132 databits. Each bit is presented in the default format as follows: Bit 0 = -127, Bit 1 = 127. end in the ITU format as follows: Bit 0 = 0x007f, Bit 1 = 0x0081. The SyncWord from the encoder is always 0x6b21. If decoder receives SyncWord as 0x6b20 it indicates that the current frame was received in error (bad frame). The DataLen parameter gives the number of speech data bits in the frame. For example using dxt, DataLen for NO_DATA frames is zero, Each bit is presented as follows: Bit 0 = -127, Bit 1 = 127. When using the MIME file storage format the encoded bitstream file starts with 9-byte magic number "#!AMR-WB\n", followed by the following data for each 20 ms input speech frame UWord8 Frame header UWord8 1st speech data octet . . . UWord8 Nth speech data octet where the frame header includes mode information and the quality bit, and the speech data octets contain the packed and sorted encoded speech bits. See RFC3267 (sections 5.1 and 5.3) for the details of this format. INSTALLING THE SOFTWARE ======================= Installing the software on the PC: First unpack the testv.zip and the c-code.zip into your directory. After that you should have the following structure: *.bat *.inp *.cod *.out makefile.gcc *.c *.h *.tab readme.txt The package include makefile for gcc, which have been tested with gcc in Windows NT msdos-box. The code can be compiled in the dos-prompt by entering the directory c-code and typing the command: make -f makefile.gcc (assuming you have gcc installed) It is probably quite straightforward to use the same make file with other systems having gcc or a standard ANSI-C compiler with only small modifications. The codec has been also successfully compiled with the Microsoft Visual C++ version 6.0. RUNNING THE SOFTWARE ==================== The usage of the "coder" program is as follows: Usage: coder [-dtx] [-itu | -mime] The DTX is activated by typing the optional switch "-dtx". By default, the DTX is not active. The ITU bit stream format is activated by typing the optional switch "-itu". Alternatively, the MIME file storage format output can be activated by using optional switch "-mime". By default, neither the ITU nor the MIME format is active. The mode is from 0 to 8 correspond the following bit-rates: 0 = 6.6 kbit/s, 1 = 8.85 kbit/s, 2 = 12.65 kbit/s, 3 = 14.25 kbit/s, 4 = 15.85 kbit/s 5 = 18.25 kbit/s, 6 = 19.85 kbit/s, 7 = 23.05 kbit/s, 8 = 23.85 kbit/s The usage of the "decoder" program is as follows: Usage: decoder [-itu | -mime] The ITU bit stream format is activated by typing the optional switch "-itu". Alternatively, the MIME file storage format can be activated by using the switch "-mime". By default, neither the ITU nor the MIME format is active. TESTING THE SOFTWARE ==================== There are two verification scripts for PC: test_enc.bat for Speech Encoder test_dec.bat for Speech Decoder Both test all the 9 speech codec modes with DTX enabled using the default bitstream format. The compare commands at the end of this file should yield no differences.

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