Instruction Manual

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

0 0 1

64Kbps to/from 12Kbps

1 1 1

64Kbps to/from 8Kbps

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.