CMX608 datasheet(51/70 Pages) CMLMICRO

51 / 70 page

RALCWI Vocoder

CMX608/CMX618/CMX638

 2014 CML Microsystems Plc

D/608_18_38/11

5.10.5.

16-bit Read-Only Registers

PLEVEL register address $31

Peak Level

This read-only register contains the peak sample value of the last 20ms frame of audio collected

for encoding. This peak sample value will be available for every 20ms frame, regardless of

whether multiple frame or single frame format is selected. Bit 6 of the STATUS register ($40) will

be set to '1' (and a C-BUS interrupt generated, if enabled) when this register is updated. This value

is only updated when the facility is turned on, by writing $09 to the service request (SVCREQ)

be ensured by keeping the Peak Level below 16384, i.e. bit 14 of the PLEVEL register should not

become set to '1'.

DFRAMEDATA register address $37

Type

Data

This read-only register contains extra information about the last 20ms frame of audio that was

decoded. The data in this register becomes valid after bit 2 in the STATUS register ($40) is set. If

this data is required, it should be read as soon as possible after it becomes valid. When decoding

multi-frame packets, once one frame is decoded, then the next frame will be processed.

For

packets of voice frames, this will happen at a rate of approximately once every 6ms, but for

packets of single tones or DTMF, the rate will be approximately once every 300µs.

The Vocoder can detect frames containing either voice, DTMF, or single tones depending on

which bits are set in the VCTRL register ($11). If the Vocoder is set up to detect DTMF and/or

single tones in the vocoded frames, the DTMF code or the single tone frequency will be reported in

this register.

Bits 0 to 11

This field contains either the DTMF code (bits 0 to 3) or the single tone frequency

Data

that was detected in the audio stream.

Bits 12 to 13

Reserved. The value of these two bits should be ignored.

Bits 14 to 15

This field indicates what sort of data is contained in the data field, as shown in the

Type

table below:

Bit 15

Bit 14

Data Type

The frame was encoded audio. The data field should be ignored.

The frame contained DTMF. The data field contains the DTMF code in bits 0

to 3 (bit 3 is the msb). All other bits should be ignored. The format of the

DTMF data is specified by bit 7 (DTMFF) of the VCFG register ($07).

Please refer to section 6.2 for the bit patterns.

The frame contained a single tone. The data field contains the single tone's

frequency in Hz. The frequency value has a resolution of 32Hz and bit 11 is

the msb.

Not used.

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