Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic
Patent
1996-09-25
1998-09-15
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Pseudo stereophonic
381 25, H04S 500
Patent
active
058091491
ABSTRACT:
An apparent location of a sound source is controlled in azimuth and range to a listener of the sound using headphones by a range control block that has variable amplitude scalers and a time delay and by an azimuth control block that also has variable amplitude scalers and time delays. An input audio signal is fed in to the range control block and the values of the scalers and the taps on the delay buffers are read out of look-up tables in a controller that is addressed by an azimuth index value corresponding to any location on a circle surrounding the headphone wearer. Several range control blocks and azimuth control blocks can be provided depending on the number of input audio signals to be located. All of the range and azimuth control is provided by the range control blocks and azimuth control blocks so that the resultant signals require only a fixed number of filters regardless of the number of input audio signals to provide the signal processing. Such signal processing is accomplished using front and back early reflection filters, left and right reverberation filters, and front and back azimuth filters having a head related transfer function.
REFERENCES:
patent: 5371799 (1994-12-01), Lowe et al.
patent: 5436975 (1995-07-01), Lowe et al.
Cashion Terry
Williams Simon
Isen Forester W.
QSound Labs, Inc.
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