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US 6,788,789 B2Granted
Phase conversion surround circuitry
AssigneeVictor Company of Japan, Ltd.
InventorKazuhito Otsuka
Life of this patent
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Abstract
A phase-conversion surround circuitry gives surround effects to right- and left-channel audio signals. An audio difference signal between the right- and left-channel audio signals is delayed at a specific time constant. The delayed audio difference signal is combined with the right- and left-channel audio signals, thus composite audio signals being generated. The time constant is periodically varying under oscillation at frequency of 12 Hz or less.
Claims3
A phase-conversion surround circuitry to give surround effects to right- and left-channel audio signals, comprising:
- a phase delayer to delay an audio difference signal between the right- and left-channel audio signals, thus outputting a delayed audio difference signal;
- a combiner to combine the delayed audio difference signal with the right- and left-channel audio signals, thus outputting composite audio signals;
- and
- a controller to oscillate at frequency of 12 Hz or less to periodically vary a time constant of the phase delayer.
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