Pseudo-stereo circuit
US6636608B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 3, 1998 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Nov 3, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S5/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pseudo-stereo circuit is provided which processes an input monophonic signal into stereophic audio signals. A phase-shift circuit shifts a phase of the input monophonic signal by a phase shift amount that depends upon a frequency of the monophonic signal, to produce an output signal having a gain with respect to the input monophonic signal which is equal to or larger than a predetermined level over an entire frequency band thereof, and reaches a peak at a frequency at which the phase shift amount of the output signal with respect to the input monophonic signal assumes a value equal or closer to −&pgr;. A mixing circuit produces a first mixed signal by mixing a signal obtained by inverting a phase of the output signal of the phase-shift circuit with the input monophonic signal by a first mixing ratio, and produces a second mixed signal obtained by mixing the output signal of the phase-shift circuit with the input monophonic signal by a second mixing ratio. The mixing circuit generates the first mixed signal as a first audio signal carried by one of left and right channels that provide stereophonic audio signals, and generates the second mixed signal as a second audio signal …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.