Remote-control system for coin-operated phonographs
US4413260A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1981 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Aug 31, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A coin-operated phonograph in which certain functions are remotely controlled. A transmitter is provided for transmitting a number of modulated carrier signals, including an up volume signal and a down volume signal. The phonograph carries a multi-channel receiver that is adapted for receiving the carrier signals transmitted by the transmitter. A detector is connected to the receiver for detecting the modulated carrier signals. An amplifier with gain control is provided and is controlled in accordance with receipt of the modulated carrier signals. A manually-operable volume control switch is carried by the phonograph and may be used instead of the transmitter to control the gain of the amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.