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Patent us6369855 Decoder surround gr sound circuits system Circuit amplifier decoding audio single seekic tone frequency dual
The 4 + 1 tone decoder 5.1 surround circuit diagram : simple surround sound decoder circuit External tone decoder wiring configuration speaker activating internal circuit figure board
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Patent US6369855 - Audio and video decoder circuit and system - Google
The 4 + 1 Tone Decoder
Index 182 - Amplifier Circuit - Circuit Diagram - SeekIC.com
Simple Circuit Design: Simple Surround Sound Decoder