User`s manual

Page 55
DVSI Confidential Proprietary
USB-3000™
User’s Manual Version 1.6a
Section 6 –Appendix
Digital Voice Systems, Inc.
The Speech Compression Specialists
41 4400 4400 0
42 4800 4800 0
43 6400 6400 0
44 7200 7200 0
45 8000 8000 0
46 9600 9600 0
47 2700 2450 250
48 3600 3350 250
49 4000 3750 250
50 4800 4550 250
51 4400 2450 1950
52 4800 2450 2350
53 6000 2450 3550
54 7200 2450 4750
55 4000 2600 1400
56 4800 3600 1200
57 4800 4000 800
58 6400 4000 2400
59 7200 4400 2800
60 8000 4000 4000
61 9600 3600 6000
Rate Index 62 is interoperable with TerreStar satellite terrestrial mobile network
62 2450 2450 0
Rate Index 63 is interoperable with TerreStar / GlobalStar mobile satellite network
63 4000 4000 0
Table 16 Standard Rat
6.2. File Form
The usb3kcom.exe program uses three types of files for storing input and/or output data transferred to/from the
USB-3000™. The three (3) file formats are as follows:
1. PCM File Type. A PCM file is a binary file that contains 16-bit PCM speech samples sampled at 8 kHz.
The file does not contain any header information. It contains only speech data. The data may be input
Each speech sample occupies two successive bytes in the
ant 8-bits of the PCM sample and the second byte contains
the most significant 8-bits of the PCM sample. To illustrate this assume that the following 16-bit PCM
0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000, 0x8000
The order in which the bytes are read from the file is as follows:
0x01, 0x00, 0x02, 0x00, 0x04, 0x00, 0x08, 0x00,
0x10, 0x00, 0x20, 0x00, 0x40, 0x00, 0x80, 0x00,
0x00, 0x01, 0x00, 0x02, 0x00, 0x04, 0x00, 0x08,
0x00, 0x10, 0x00, 0x20, 0x00, 0x40, 0x00, 0x80.
e Table for AMBE-3000™ Vocoder Chip (by index number)
ats
to the encoder or output from the decoder.
file. The first byte contains the least signific
samples are stored in a PCM file: