| 摘要 |
The invention detects commercials interrupting television programs by comparing signals in a comparator (16) received from multiple regions (1, 6, 11) of a network. If one or more of the received signals differs from the other received signals by more than a preset amount, generating a signal via output (17) indicating the presence of a commercial. Because different commercials are inserted in different regions of a network, the signals are generally very similar during program transmission and very different during commercial transmission.
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