Download Minimum Performance Specification for the Enhanced

C.S0018-D v1.0
Value in Packet File
Rate
Data Bits per Frame
3 = 0x0003
1/2
80
1 = 0x0001
1/8
16
0 = 0x0000
Blank
0
Erasure
0
14 = 0x000e
1
4
Unused bits are set to 0. For example, in a Rate 1/8 frame, the packet file will contain the word
0x0100 (byte-swapped 0x0001) followed by one 16-bit word containing the 16 data bits for the frame
(in byte-swapped form), followed by ten 16-bit words containing all zero bits.
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3.3.4
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This section describes the C simulation of the speech codec specified by [1]. The speech codec C
simulation is based on finite precision, fixed-point arithmetic operations and is recommended to be
used as a reference codec to verify the performance of a bit-exact EVRC-WB implementation of the
fixed-point C simulation of a test codec. The bit-exact EVRC-WB codec, along with the appropriate
test vectors to verify the bit-exactness performance, are included in the associated Software
Distribution.
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3.3.4.1
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This section describes the C program files which are provided in the associated software distribution
for this document.
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3.3.4.2
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The source code for the fixed-point codec simulation has been written in C++ and can be compiled
using any general purpose compiler such as the GNU G++ compiler and make utility.
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3
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Fixed-Point Bit-Exact Codec for SO 70
Fixed-Point Codec Program Files
Compiling the Fixed-Point Codec Simulation
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Two GCC compatible makefiles have been included in the /build directory. Typing “make” in the /build
directory will compile and link the code and create the executable file called Evrc_wb_fx
(Evrc_wb_fx.exe on Win32 systems), which will be placed in the /build directory. The included
makefiles may require some user modification for a particular hardware platform and/or operating
system.
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3.3.4.3
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The EVRC-WB executable files use command line arguments to receive all information regarding
input and output files and various parameters used during execution.
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Running the Fixed-Point Codec Simulation
Executing Evrc_wb_fx with no command line arguments will display a brief description of the required
and optional command line arguments. The options are described below:
-i infn (required)
Specifies the name of the input speech file, or the name of the input
packet file if only decoding is being performed (see the -d option below).
-o outf (required)
Specifies the name of the output speech file, or the name of the output
packet file if only encoding is being performed (see the -e option below).
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