Method and circuit for creating phantom sources using phase shif

Details Method and circuit for creating phantom sources using phase shif Method and circuit for creating phantom sources using phase shif

1997-02-14

1999-06-15

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Binaural and stereophonic

381 17, 381 28, 381 97, H04R 500

Patent

active

059129751

ABSTRACT:
In portable stereo radio receivers and television receivers, the loudspeakers therein may be separated only by a limited amount. This severely restricts the stereo image created by the loudspeakers. A circuit arrangement for creating an expanded stereo image may be incorporated in such receivers. This circuit arrangement includes, for each stereo channel, a first and a second all-pass 0.degree.-180.degree. phase shifter, wherein the first phase shifter shifts the input signal by 90.degree. at a frequency of 10 KHz, while the second phase shifter shifts the input signal by 90.degree. at a frequency of 100 Hz. The output from the first phase shifter in the left channel is combined with the output from the second phase shifter in the right channel to form the left channel output signal. Similarly, the output from the first phase shifter in the right channel is combined with the output from the second phase shifter in the left channel to form the right channel output signal.

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