Receiver addressable AM compatible digital broadcast system
US6128334A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1997 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Feb 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H2201/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention provides for a receiver addressable AM compatible digital broadcast system and method. The digital broadcast signal includes a plurality of digitally modulated signals and an analog signal. A transmitter useable within the system includes a data combiner for generating an aggregate digital data signal, and a waveform generator for forming the digital broadcast signal. A receiver useable within the system comprises a waveform detector for separating the signals and a data parser for separating the digitally modulated signals. The present invention further provides for a method of selectively transmitting data via a digital broadcast signal. The method includes forming the digital broadcast signal from an analog signal and a plurality of digitally modulated signals, transmitting and receiving the digital broadcast signal. The method further includes the steps of separating the analog signal from the digitally modulated signals, separating the digitally modulated signals, comparing a destination identification signal with an identification code, and passing a user defined message signal responsive to the destination identification digital signal corresponding to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.