SC14CVMDECT datasheet(16/57 Pages) DIALOG

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Datasheet

Revision 3.0

28-Jul-2015

CFR0011-120-00-FM Rev 5

16 of 57

SC14CVMDECT SF

Cordless Voice Module

FINAL

4.4 AUDIO ROUTING

4.4.1 FP audio routing

Figure 10 shows the audio routing for an FP. Input and

output signals are supported both for the internal codec

and the PCM, and the Air interface supports G.726

(32 kbit/s ADPCM) and G.722 (64 kbit/s ADPCM). The

internal software supports up to 4 audio channels

simultaneously. Supported sample rates are 8 kHz and

16 kHz.

FP does not support acoustic or line echo cancellation.

4.4.2 FP audio level adjustment

The internal codec audio levels can be controlled with

the parameters MicGain and LsrGain.

The MicGain range is 0 to 30 dB in steps of 2 dB and a

value of -128 will mute the input signal, default is 0 dB.

The LsrGain range is +2 dB to -12 dB in steps of 2 dB,

default is +2 dB. See document reference[1].

4.4.3 PP audio routing

Figure 11 and Figure 12 show the different audio rout-

ing modes of a PP. Figure 11 shows an overall audio

routing and Figure 12 shows the detailed audio routing

for the speakerphone of PP (FP does not support

speakerphone).

4.4.4 PP audio codec adjustment

The audio codec settings for the loudspeaker and

microphone must be pre-configured in the VES for

each mode. The VES parameter fields for

Audio.Earp.xxx

Audio.Heads.xxx

Audio.SpkPh.xxx

have a default value and maybe fine-tuned for the

application. See document reference [4].

4.4.5 General audio adjustment

For each audio mode, the receive (RLR) and transmit

(SLR) audio paths must be adjusted. RLR and SLR are

adjusted in the registers in the VES for each audio

state; see document reference [4]. Figure 13 shows

this image.

4.4.6 PP volume

The PP supports 6 volume steps, which are VES con-

figurable through parameter fields Audio.Earp.Vol.xxx,

the Audio.Heads.Vol.xxx and Audio.SpkPh.Vol.xxx.

The volume steps must be set initially in the VES dur-

ing production; see document reference [4].

4.4.7 PP audio equalization

To enable adjustments of the frequency response the

PP contains four programmable filters: 2 in RX direc-

tion and 2 in TX direction (see Figure 11).

By default these filters are loaded with bypass coeffi-

cients. These can be modified by loading new coeffi-

cients via API commands.

Equalizer filters are part of the audio routes for all audio

modes and are placed as shown in Figure 11.

For a detailed description of the filter functionality refer

to the API documentation; see document reference [2].

Figure 10: FP audio routing

Mask &

Shift

G726

Encoder

G726

Encoder

G726

Encoder

G726

Encoder

Mac

G726

Encoder

G726

Encoder

G726

Encoder

G726

Decoder

Mac

G726

Encoder

G726

Encoder

G726

Encoder

G722

Encoder

Mac

G726

Encoder

G726

Encoder

G726

Encoder

G722

Decoder

Mac

Unit

Soft Mute

(bit errors on air interface)

IoCtrl

PCMx

Codec

PCMx

Out

Codec

Out

Mask &

Shift

Mask &

Shift

Mask &

Shift

G711

Decoder

G711

Decoder

G711

Decoder

G711

Decoder

CWB

Unpack

CWB

Unpack

CWB

Unpack

CWB

Unpack

IoCtrl

Mask &

Shift

Mask &

Shift

Mask &

Shift

Mask &

Shift

G711

Decoder

G711

Decoder

G711

Decoder

G711

Encoder

CWB

Unpack

CWB

Unpack

CWB

Unpack

CWB

Pack

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