Panasonic GP 31, Техническое руководство

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4. Audio Circuit
Outline
Three sound modulations available in GP-31 chassis which are STEREO, AV
STEREO and MONO. Depending upon the version of the UOC IC601 and MSP IC2101
used, gives different sound modulation.
4.1 Audio Processor
Two different sound processors are used in GP-31. IC2101 is used as Sound
Processor and IC2301 as Audio Amplifier.
4.1.1 Sound Processor (IC2101)
Outline
The IC2101 is a single-chip multi-standard sound processor covers the sound
processing of all analog TV-standards worldwide, as well as the NICAM digital sound
standards. The full TV sound processing, starting with analog sound IF signal-in, down to
processed analog AF-out, is performed on this single chip.
For STEREO model, audio signals from AV terminals are fed to pin 53 & 54
(AV1), pin 56 & 57 (AV2) and pin 47 & 48 (YUV) of MSP IC2101 for sound processing.
SIF signal from UOC IC601 pin 33 is fed to pin 67 of IC2101. The audio signals are then
fed to Audio amplifier IC2301 before output to loudspeakers.
For AV STEREO model, audio signals from AV terminals are fed to pin 53 & 54
(AV1), pin 56 & 57 (AV2) and pin 47 & 48 (YUV) of MSP IC2101. SIF signal is from
UOC IC601 pin 48 is fed to pin 60 of IC2101. The audio signals are then fed to Audio
amplifier IC2301 before output to loudspeakers.
As for MONO model, audio signals are fed directly to pin 28 (AV1 Left-channel)
and pin 29 (AV2 Right-channel) of UOC IC601 for sound processing. The audio output
is then fed to Audio amplifier IC2301A for amplification before loudspeakers via pin 48
of IC601.
4.1.2 Audio Amplifier (IC2301 & IC2301A)
Outline
The audio signal from IC2101 is amplified by IC2301 and passes it to loudspeakers.