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AUDIO SIGNAL PATH
Audio Signal Processing
Figure 19
All Audio Processing is performed by 7651, which is located on the SSB. The Sound IF is fed to Pin 50 and to
the Sound Demodulator for decoding. The internal Switch selects between AV1, AV2, and AV3. The Audio is
digitally processed inside the IC to separate the Second Audio Program and process volume levels to maintain
a constant audio level if the user selects the AVL feature. The AUDIO-L and AUDIO-R are fed to the audio
amplifier on the Large Signal Board. The Headphone output on Pins 18 and 17 is fed to the Headphone
amplifier on the LSB. SC1_OUT-L and SC1_OUT_R on Pins 28 and 29 are fed to the monitor audio jacks on
the LSB. The AUDIO-SW, Subwoofer output, is fed to the LSB and then to the Subwoofer module. Audio
frequencies above 100 Hz are filtered out for this output. Volume levels are controlled in the Audio Processor
IC.
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