Audio Section; Audio Scheme; Figure 3-6 Diagram Of Audio Section - RCA RDR9000 Service Manual

Service Manual

3.3 Audio Section

3.3.1 Audio Scheme

The audio module is mainly for audio input and output. TLV320AIC29 (U3003) is used as the
audio codec to convert and process audio signal and digital signal. The Class AB BTL
amplifier TDA7297SA (U3009) is used to amplify the output audio signal.
EXT_MIC2
EXT_MIC1
26-Pin
Interface
Handset_Audio
RX_Audio
PA_Audio
 Two MIC Inputs
The system has two MIC inputs from the external interface. The selected MIC will enter the
noise reduction IC for noise elimination to ensure optimal audio fed to the audio codec. The
two MIC inputs can be sampled at the same time and can be transmitted with an independent
slot respectively.
R261
A_OUT1
MIC0
R261
A_OUT1
MIC0
AMP
SW
AMP
AF power AMP
INT
SPK+/-
AMP AMP
SW
AMP
AMP
AMP SW AMP SW

Figure 3-6 Diagram of Audio Section

IIS
Audio Codec
MICIN_HND
TLV320AIC29
IIS
Audio Codec
MICIN_HND
TLV320AIC29
SPK
SPK
CP_IN
OUT1 OUT2
SW
13
3. Baseband Section
MCASP
AXR8/15
(ACLKX)
OMAP-L138
MCASP
AXR8/15
(ACLKX)
OMAP-L138
Key
Voice
EPWM0B