Audio identification system and method

A cellular telephone configured to capture an audio signal and transmit corresponding feature signals to a recognition site, the recognition site having a processor which receives the corresponding feature signals and compares them to a plurality of stored feature signals which correspond to song information, the cellular telephone comprising:

• a microphone receiving analog audio signals;
• an A/D converter converting the received analog audio signals to digital audio signals;
• a signal extractor processor disposed in said cellular telephone and configured to extract spectrally distinct feature signals from the digital audio signals;
• a memory disposed in said cellular telephone and configured to store the extracted feature signals;
• a terminal disposed in said cellular telephone and configured to transmit the stored extracted feature signals to the recognition site, and for receiving from the recognition site an identification signal which corresponds to the stored extracted feature signals.

A processor for an audio signal recognition system having a hand-held device and a recognition server, the hand-held device capturing audio signals and providing them to the processor, the recognition server (i) receiving from the processor extracted feature signals that correspond to the captured audio signals and (ii) comparing received extracted feature signals to a plurality of stored audio templates, the processor comprising:

• an interface for receiving the captured audio signals from the hand-held device;
• processing structure configured to (i) form extracted feature signals corresponding to the received captured audio signals, the extracted feature signals corresponding to different frequency bands of the captured audio signals, and (ii) zero-pad the extracted feature signals to extend the duration thereof;
• a memory for storing the extracted feature signals;
• and
• an activation device which causes the stored extracted feature signals to be sent to the recognition server.

Apparatus for an audio signal recognition system having a hand-held device and a processor, the hand-held device capturing audio signals and transmitting to the processor signals which correspond to the captured audio signals, the processor transmitting extracted feature signals to the apparatus, the apparatus comprising:

• an interface receiving the extracted feature signals from the processor;
• a memory storing a plurality of feature signal sets, each set corresponding to an entire audio recording;
• and
• processing circuitry which (i) receives the extracted feature signals, (ii) compares the extracted feature signals with the stored feature signal sets, (iii) provides recognition data corresponding to the comparison, (iv) compares the recognition data with prior recognition data, and (v) provides a recognition signal based on the later comparison.

A hand-held music capture device comprising:

• a microphone which receives a random portion of an analog audio signal;
• an analog-to-digital converter to convert the received portion of the audio signal into a digital signal;
• a signal processor which (i) receives a less than approximately six second portion of the digital signal and (ii) signal processes same into a digital time series representing the voltage waveform of the captured audio signal;
• a memory which stores the processed fixed-time portion of the digital signal that corresponds to less than a complete audio work;
• transmission structure which transmits the stored portion of the digital signal to a recognition processor;
• and
• indicia structure configured to indicate an identification signal provided by the recognition processor, said identification signal corresponding to the random portion of the analog audio signal.

A method of recognizing free-field audio signals, comprising the steps of:

• capturing free-field audio signals with a hand-held device having a microphone;
• transmitting signals corresponding to the captured free-field audio signals to a processor;
• transmitting from the processor to a recognition site, audio signal features which correspond to the signals transmitted to the processor;
• at least one of the hand-held device and the processor extracting a time series of spectrally distinct audio signal features from the captured free-field audio signals;
• storing data corresponding to a plurality of audio templates in a memory at the recognition site;
• matching the audio signal features received from the processor with at least one of the audio templates stored in the recognition site memory, using a recognition processor;
• and
• providing to the hand-held device a recognition signal which corresponds to at least one of the audio templates stored in the recognition site memory.