TDM digital matrix intercom system
US5483528A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1994 |
| Grant date | Jan 9, 1996 |
| Priority date | — |
| Expiry date | Oct 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A time division multiplexing ("TDM") digital matrix intercom system for connecting intercom stations. The system includes a digital switching system receiving audio input communications signals from at least some of the intercom stations, and sending audio input communications signals to at least some of the intercom stations. The digital switching system includes a TDM system for broadcasting on a TDM bus multiple digital communications signals including such digital audio input signals. The TDM system includes one or more interfaces connecting intercom stations with the TDM bus. The system also includes a signal mixer which is capable of receiving from the TDM bus selected ones of the digital audio input signals, and creating and broadcasting on the TDM bus a custom mixed digital audio output communications signal which is a loudness weighted mix of such selected digital audio input signals with at least one of such selected signals optionally being given a larger weight corresponding to a louder volume than others of the selected signals. A custom mixed digital audio output signal thus may be routed to a selected one of the intercom stations as an audio output communications sig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.