Method and system of processing 5.1-channel signals for stereo replay using binaural corner impulse response
AssigneeWATA Electronics Co., LTD
InventorsRen Xu, Litang Gu
Life of this patent
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Abstract
A down-mixing method of 5.1 audio input channels for two channel replay by DRC processing of the LFE and the LS and RS channel signal before mixing, and by filtering LS and RS channels with BRTFs measured from placing a loud speaker at a corner of a room and measuring head at the diagonal corner of the room.
Claims24
A method for down-mixing audio signals from a 5.1-channel input having a channel L, a channel R, a channel C, a channel LFE, a channel LS and a channel RS, comprising the steps of:
- about a −3 dB DRC (dynamic range compression) processing of the LFE channel signals using a DRC circuit before mixing,
- about a respectively +3 dB boosting of the LS and the RS channel signals using an amplifying circuit;
- and
- then about a −3 dB DRC processing respectively of the boosted LS and RS channel signals using a DRC circuit.
A method for down-mixing audio signals from a 5.1-channel input having a channel L, a channel R, a channel C, a channel LFE, a channel LS and a channel RS, comprising the steps of:
- down-mixing said audio signals from each of respective 5.1 channels, outputting a left channel L′ audio signal and a right channel R′ audio signal wherein said L′ and R′ audio signals are defined by a formula as follows:
- L′=L+0.707C+∇(LFE)+∇[1.414(GCLS+GIRS)]
- R′=R+0.707C+∇(LFE)+∇[1.1414(GILS+GCRS)]
- wherein operator ∇ represents a −3 dB DRC processing, GC and GI respectively represents a combined result of a process of crosstalk cancellation and a process of generating binaural signals, 0.707 represents a attenuation of −3 dB in signal magnitude, 1.414 represents an enhancement of +3 dB in signal magnitude, L, R, C, LFE, LS, and RS respectively represents signal magnitude of each respective corresponding channel.
A binaural replay system for playing audio signals from a 5.1-channel input having a channel L, a channel R, a channel C, a channel LFE, a channel LS and a channel RS, said system comprising:
- an audio compressor unit for a −3 dB DRC processing of the LFE channel signals before mixing;
- an amplifier circuit for a respectively +3 dB boosting of the LS and the RS channel signals;
- and
- a compressor circuit for a −3 dB DRC processing respectively of the boosted LS and RS channel signals.
A binaural replay system for replaying audio signals from a 5.1-channel input having a channel L, a channel R, a channel C, a channel LFE, a channel LS and a channel RS, comprising:
- an electronic processing unit for down-mixing said audio signals of respective 5.1 channels, outputting a left channel L′ audio signal and a right channel R′ audio signal wherein said L′ and R′ audio signals are defined by a formula as follows:
- L′=L+0.707C+∇(LFE)+∇[1.414(GCLS+GIRS)]
- R′=R+0.707C+∇(LFE)+∇[1.1414(GILS+GCRS)]
- wherein operator ∇ represents a −3 dB DRC processing, GC and GI respectively represents a combined result of a crosstalk cancellation process and a process of generating binaural signals, 0.707 and 1.414 respectively represents a attenuation of −3 dB in signal magnitude and an enhancement +3 dB in signal magnitude, L, R, C, LFE, LS, and RS respectively represents signal magnitude of each respective corresponding channel.
Dependencies are inferred from the claim text.