Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1996-06-11
1999-03-02
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 1, H04R 500
Patent
active
058781455
ABSTRACT:
Acoustic signals received by the ears are controlled by feeding back and filtering the signal to be applied to the speaker, rather than by use of a feedforward filter. The feedback filter may incorporate an electrical model of the speaker-to-ear transfer function to force the ear signals to a desired ratio of amplitudes and phases as a function of the frequency. The signals to be output to the right and left channels are fed back through a filter to obtain a feedback signal. The feedback signal is subtracted from one input channel and added to the other input channel to provide the output signals. This technique may be used both in stereo spreading and in three-dimensional localization of a monaural sound source. By using feedback instead of feedforward, the system can be readily adapted to different playback environments. Through a simple adjustment of the electrical model of the speaker-to-ear transfer functions, this system automatically provides the desired ear signals. Since the adjustment simply changes a model, it is possible dynamically to adapt the model to suit the position of the listener. For a simple low-cost stereo spreading system, the filter can be a simple feedback system where several transfer functions are reduced to a single filter.
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Analog Devices Inc.
Kuntz Curtis A.
Lee Ping W
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