CMX608 datasheet(47/70 Pages) CMLMICRO

47 / 70 page

RALCWI Vocoder

CMX608/CMX618/CMX638

 2014 CML Microsystems Plc

D/608_18_38/11

Bit 5

Decoder DTMF Detect: If this bit is set to '1' the decoder will detect the special

DDTMFD

DTMF frames. If DTMF is detected, the 4 bit DTMF code will be placed in the

DFRAMEDATA register ($37). If a special DTMF frame is not detected, the frame

will be passed on to the next decoding stage.

If this bit is cleared to '0', special DTMF frame detection will not be done and the

frame will be passed on to the next decoding stage.

Bit 6

Decoder DTMF Generate: If this bit is set to '1' and the decoder is detecting the

DDTMFG

special DTMF frames, the decoder will generate the DTMF tones in the output

audio stream.

The level of the generated DTMF may be controlled by the

DTMFATTEN register ($0A).

If this bit is cleared to '0', DTMF tones will not be generated.

This bit is ignored if DTMFD is cleared to '0'.

Bit 7

Decoder STD Detect: If this bit is set to '1' the decoder will detect the special STD

DSTDD

frames. If an STD frame is detected, the frequency (in Hz) will be placed in the

DFRAMEDATA register ($37). If a special STD frame is not detected, the frame

will be passed on to the next decoding stage. See section 6.4 for further details.

If this bit is cleared to '0', special STD frame detection will not be done and the

frame will be passed on to the next decoding stage.

Bit 8

Decoder STD Generate: If this bit is set to '1' and the decoder is detecting the

DSTDG

special STD frames, the decoder will generate the detected tone in the output

audio stream.

If this bit is cleared to '0', the detected single tone will not be generated. This bit is

ignored if DSTDD is cleared to '0'. See section 6.4 for further details.

Bit 9

Decoder STD Priority: Controls the order of frame processing in the decoder.

DSTDP

Single tone detection and DTMF detection are separate states that are performed

on the input frames before being given to the Vocoder to decode.

If this bit is set to '1' the decoder will first try and detect a special STD frame

before a special DTMF frame.

If this bit is cleared to '0', the decoder will first try and detect a special DTMF

frame before a special STD frame.

This bit is only significant if both DSTDD and DDTMFD bits are set to '1'. If either

bit is cleared to '0', then the DSTDP bit is ignored.

Bit 10

This bit must be cleared to '0' for correct operation.

Bit 11

Encoder DTMF Detect: If this bit is set to '1' the encoder will try and detect DTMF

EDTMFD

tones in the input audio stream. If DTMF is detected, the encoder will form a

special DTMF frame and place the detected DTMF code in the EFRAMEDATA

stage.

If this bit is cleared to '0', no DTMF detection will be attempted.

If this bit is set to '1', then the DDTMFD bit in the decoder at the other end of the

channel should also be set to '1'.

CMX608 数据表(PDF) 47 Page - CML Microcircuits

CMX608 数据表(HTML) 47 Page - CML Microcircuits

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