Circuitry and method for detecting audio standard of sound intermediate frequency signal
US11165985B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 2021 |
| Grant date | Nov 2, 2021 |
| Priority date | — |
| Expiry date | Apr 18, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Circuitry for detecting an audio standard of a sound intermediate frequency signal includes an intermediate frequency to baseband circuit, a detection circuit and a demodulator/decoder. The intermediate frequency to baseband circuit is configured to process the sound intermediate frequency signal to generate a main tone and a sub-tone. The detection circuit is configured to determine if the sound intermediate frequency signal belongs to a first standard or a second standard according to if the sub-tone has a pilot signal or a digital frame, to generate a detection result. The demodulator/decoder is configured to demodulate/decode at least the main tone to generate an output audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.