Method and apparatus for combining a wireless receiver and a non-wireless receiver
US6717533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2001 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Mar 3, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R5/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A vehicular audio system receives audio inputs from audio sources and a radio receiver. Analog audio is converted to digital, and digital audio remains natural digital. The receiver front end converts a radio signal to an intermediate frequency then an ADC converts that to a digital signal. The inputs that are converted to digital are selectively mixed with each other and with the natural digital signals. This allows for sounds from multiple sources to be heard simultaneously so that a telephone ring may be provided without requiring background music to be interrupted and for uses such as voice by microphone over a music tape. A reference frequency to the receiver front end of 7.2 MHz is particularly beneficial for noise reduction and consequent mixing of digital audio at 48 KHz, the standard frequency for typical digital audio inputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.