Data transmission system
US5725383A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 26, 1996 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Sep 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H2201/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a karaoke system, a central terminal and a plurality of karaoke terminals are connected by a coaxial cable. A polling modem modulates a polling signal to a predetermined channel signal and transmits it to a karaoke terminal and also receives a response signal (signal for responding as to whether a song has been requested) transmitted from the karaoke terminal in response to the polling signal. When a song is requested, the data transmission control portion retrieves the karaoke song data of the requested song from the memory, modulates it via the data transmission modem into an alternating current signal that differs from the channel of the polling signal, and transmits it to the karaoke terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.