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8
Audio Processing
U32603 The IF processor takes the tuner IF signal and processes it, separating audio, video, and IF carrier. The separated audio is in wide band audio (WBA) and is sent to U31701 stereo decoder.
U31701 The stereo decoder is IIC bus controlled and takes the WBA from the IF processor and detects mono or stereo signals and processes each channel (right and left). Secondary Audio Programing (SAP) is also decoded in U31701. The right channel is sent to audio switch U11401 and the left channel is sent to U11400.
9 U11400 / U11401 Right and Left channel audio switch switches between tuner audio and auxiliary audio inputs.
U11800 The TVB or tone volume balance IC is IIC bus controlled that processes the right and left channel audio and passes it through the SRS processing. All volume, balance, and tone adjustments are done in the TVB. After SRS processing the TVB sends the audio to the audio outputs.
10 SRS (Sound Retrieval System) processing is accomplished by filtering, phase inversion and summing circuits of U11700, U11701, and U11702. When the SRS process is turned off, the gain and frequency response of both the sum and difference signals are flat. This renders normal stereo channels at the right and left audio outputs.
U11901 /U 1902 Left and Right audio outputs are class D amplifiers that take the audio signals from the TVB (Right & Left) and amplify the signals. The amplified signals are then sent to the speakers.