Method and circuit for creating phantom sources using phase shifting circuitry
US5912975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1997 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Feb 14, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S1/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.