Rainbow Electronics DS2130Q User Manual
Page 7
DS2130Q
041295 7/22
VOICE CONTROL REGISTER Figure 4
(MSB)
(LSB)
CP/EX
CXS1
CPD1
CXRST
CXLB
U/A
CXS2
CXS3
SYMBOL
POSITION
NAME AND DESCRIPTION
CP/EX
VCR.7
Compression/expansion select.
1 = compress (record)
0 = expand (playback)
CXS1
VCR.6
Compression/expansion bit rate select 1; see Table 2.
CPD1
VCR.5
Compression/Expansion power-down 1.
0 = Compression/expansion enabled
1 = Compression/expansion disabled
CXRST
VCR.4
Compression/expansion algorithm reset.
0 = normal operation
1 = reset algorithm to initial coefficients
CXLB
VCR.3
Compression/expansion interface loopback.
0 = normal operation
1 = bypass selected channel
U/A
VCR.2
PCM input/output data format.
0 = A-Law
1 =
µ
-Law
CXS2
VCR.1
Compression/Expansion bit rate select 2; see Table 2.
CXS3
VCR.0
Compression/Expansion bit rate select 3.
COMPRESSION/EXPANSION BIT RATE SELECT Table 2
ALGORITHM SELECTED
CXS1
CXS2
CXS3
64Kbps to/from 32Kbps
0
0
0
64Kbps to/from 24Kbps
1
1
0
64Kbps to/from 16Kbps
0
1
0
Reserved for future operation
1
0
0
64Kbps to/from 16Kbps
1
0
0
1
64Kbps to/from 12Kbps
1
1
1
1
64Kbps to/from 8Kbps
1
0
1
1
64Kbps to/from 64Kbps
(PCM Bypass mode)
1
0
1
NOTE:
1. These reduced bandwidth modes use an internal low-pass filter at 1.7 KHz to permit a lower bit rate. The
normal bandwidth otherwise is 300 Hz to 3.4 KHz due to the filters typically present in the codec/filter device
used with the DS2130.