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SSB AUDIO PROCESSING (Figure 60)
Audio processing is performed by IC 7651, located on the SSB (Small Signal Board).
Baseband audio is fed to the signal processor on Pin 50. R-SC1_AV1-IN, L-SC1_AV1-IN, R-
SC2_AV2-IN, and L-SC2_AV2-IN are fed to the IC on Pins 44, 45, 41, and 42. PIP audio
from the PIP/DW board is input on Pin 47. The selected AV inputs can be output on Pins 25
and 26 or can be sent to the Sound processor via the Left and Right A/D (Analog to Digital)
converters. The Sound processor selects between the output of the Demodulator or the
selected AV input for processing. The Sound processing includes Volume, Equalizer,
Balance, Loudness, Incredible Sound, and Virtual Dolby. The digitized audio is output on Pin
5 to the System board to an Audio Delay circuit. The signal is returned to the IC on Pin 6.
Due to the time required for the video processing, it is necessary to delay the audio to obtain
the proper sync. The Main Speaker signal is output on Pins 20 and 21. The signal is
buffered and fed to ICs 7653 and 7652. ICs 7653 and 7652 connect the Speaker Amplifier to
the Center Channel audio from Pin 22 or the Main audio from Pins 20 and 21. If the Center
Channel audio has been selected for the Main Speakers, the MON-OUT (R-CL_VL-OUT and
L-CL_VL-OUT) are connected to Pins 20 and 21. If the output on Pins 20 and 21 is selected,
the MON-OUT is connected to the outputs on Pins 25 and 26. Selected Headphone signal is
output on Pins 17 and 18. SW (Sub Woofer) audio is output on Pin 23.
Page 69
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