Carrying auxiliary data within audio signals
AssigneeLinear Acoustic, Inc.
InventorTim J. Carroll
Life of this patent
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Abstract
A system for inserting auxiliary data into an audio channel that carries an audio signal includes a modulator configured to convert an auxiliary data signal into a modulated auxiliary data signal that has a passband within the audio channel's passband. The system for inserting auxiliary data into an audio channel that carries an audio signal further includes summing means configured to combine the modulated auxiliary data signal and the audio signal into a combination signal to be carried in the audio channel.
Claims20
A machine comprising:
- a system configured to insert auxiliary data into an audio channel that carries an audio signal, the system including:
- a modulator configured to convert an auxiliary data signal into a modulated auxiliary data signal having a passband within the audio channel's passband but outside the audio signal's passband;
- and
- summing means configured to combine the modulated auxiliary data signal and the audio signal into a combination signal to be carried in the audio channel.
A machine comprising:
- a system configured to extract auxiliary data from an audio channel, the system including:
- a first filter configured to receive a combination signal including an audio signal and a modulated auxiliary data signal, where the modulated auxiliary data signal has a passband within the audio channel's passband and outside the audio signal's passband, and where the first filter is further configured to attenuate frequencies outside the modulated auxiliary data signal's passband to substantially obtain the modulated auxiliary data signal;
- and
- a demodulator configured to convert the modulated auxiliary data signal into an auxiliary data signal encoding the auxiliary data.
A method of inserting metadata to be carried within audio signals, the method comprising:
- receiving an audio signal;
- receiving a metadata signal;
- transforming the metadata signal into a modulated metadata signal having a passband within the audio passband and not overlapping the audio signal's passband;
- and
- combining the modulated metadata signal and the audio signal to form a combination signal incorporating the metadata signal and the audio signal.
A method of extracting metadata carried within audio signals, the method comprising:
- receiving a combination signal including an audio signal and a modulated metadata signal encoding the metadata, where the modulated metadata signal has a passband within the audio passband and not overlapping the audio signal's passband;
- filtering the combination signal to separate the audio signal and the modulated metadata signal;
- and
- demodulating the modulated metadata signal.
Dependencies are inferred from the claim text.