User's Manual

PCS3_HD_v01.000
Confidential / Preliminary
Page 74 of 101 2013-10-21
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PCS3 Hardware Interface Description
6.7 Electrical Characteristics of the Voiceband Part
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Echo
canceller,
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Noise
suppresson
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with
one or two
Micro-
phones
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Filter
flat gain=0dB
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6.7.2 Audio Programming Model
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The audio programming model shows how the signal path can be influenced by varying AT
command parameters: AT^SNFI allows to set the parameters <micAmp1>, and<mic TxVol>,
whereas the parameters <cdcRxGain>, <stGain> and <rxVol> can be adjusted
with AT^SNFO.
For more information on the AT commands and parameters see Section 6.7.1
and [1].
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If the digital audio interface (PCM) is selected, the parameters <micAmp1>, and <cdcRxGain>
have no influence; because they are not involved in the signal paths.(PCS3 didn’t support I2S)
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Application
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Digital logical channels:
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gain=0dB
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<io>
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gain=0dB
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Aux MIC
Main MIC
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Speaker
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Codec
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I
2
S right channel
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I
2
S left channel / PCM mono
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4
PCM mono
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I
2
S left channel
4
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PCM /
I
2
S
Interface
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I
2
S
Interface
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1
3
2
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<micTxVol>
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Speech
coder
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VMIC
Codec
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MIC
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Microphon
e
feeding
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EP
<micAmp1>
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A
D
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<cdcRxGain>
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D
gain=0dB
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PCM
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1
3
2
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<stGain>
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3
2
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<rxVol>
Filter
Speech
coder
32 Ohms
A
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flat gain=0dB
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Module
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Red: Audio mode parameters adjustable by AT commands
Orange: Selectable Audio Mode Parameter - on request adjustable by Cinterion
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Figure 34: Audio programming model