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US 4,905,283 AGranted
Surround decoder
AssigneeSanyo Electric Co., Ltd.
InventorsTsutomu Ishikawa, Ryuichi Ogawa, Masaya Tanno, Fumio Tosaka
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Abstract
A surround-decoder comprises terminals to which left and right stereo input signals are applied, a decoder for processing the left and the right stereo input signals to provide left and right stereo output signals, a center output signal and a surround output signal, circuits for detecting the left and the right stereo input signals to be monaural signals, and a switch responsive to an output signal of the detecting circuit for cutting off an output of a surround signal from the decoder.
Claims5
A surround-decoder comprising:
- means for providing left and right stereo input signals,
- decoder means for receiving said left and right stereo input signals to generate left and right stereo output signals, a center output signal and a surround output signal,
- detectihg means for detecting said left and right stereo input signals to be monaural signals, and
- means responsive to said detecting means for cutting off said surround signal from said decoder means.
1 more element
Dependencies are inferred from the claim text.