| 摘要 |
<p>An audio matching system for detecting matching of audio signals, the system comprising: a digital signature generation device (1) for generating signatures from an audio signal, the device comprising: a signal energy analyser (12) arranged to determine the energy level at each of one or more particular frequencies in a sampled data segment of the audio signal; an event detector (13) arranged to detect the occurrence of a predetermined event in the energy level of each said particular frequency of the sampled data segment; a signature generator (14) arranged to extract event data identifying a set of predetermined events detected by the event detector, the event data forming a digital signature for the sampled data segment; and a transmitter for transmitting the digital signature; and an audio signal comparing device (2) for comparing whether two audio signals match, the audio signal comparing device (2) comprising: a receiver (21) for receiving a said digital signature of an audio signal generated by the digital signature generation device (1); an event locator (23) arranged to use the event data of the received digital signature to locate corresponding portions of another sampled data segment of another audio signal; and an event analyser (24) arranged to analyse the corresponding portions located by the event locator (23) and to determine whether they match the predetermined events of the event data, to thereby determine whether the audio signals match.
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