| 摘要 |
A broadcast acknowledgement method and system wherein a digital information signal, generated in order to indicate the content with regard to a present broadcast program (for example, a commercial broadcast program on television, radio or CATV), is superimposed on the voice signal of said program for broadcast and the composite signal transmitted to the receiving station, where it is processed to retrieve the digital information signal. Thereby, it can be confirmed whether or not the particular program has been broadcast or not. The method generally comprises the steps of removing the particular frequency band of the voice signal, generating the digital information signal by using some of the desired frequency signals within the particular frequency band of the voice signal, superimposing the digital information signal on the voice signal, transmitting the composite signal, extracting the digital information signal from the received signal at the receiving side, and processing the digital information signal so extracted to identify the particular program broadcast, and thus to obtain broadcast acknowledgement information such as sponsor's name, performers' name, time of broadcasting, etc. The broadcast acknowledgement system comprises, in several embodiments, a voice amplifier, band elimination filters, digital information generation circuit, various signal generators, and a mixing circuit; and, in another embodiment, a voice amplifier, band elimination filters, a digital information generation circuit, and a selector circuit.
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