VAD detection apparatus and method of operation the same
First Claim
1. A method in a microphone assembly including an acoustic sensor and a voice activity detector on an integrated circuit coupled to an external-device interface of the microphone assembly, the method comprising:
- receiving acoustic energy at the acoustic sensor;
filtering data representative of the acoustic energy into a plurality of bands;
obtaining a power estimate for at least one of the plurality of bands,the power estimate including a first estimate based on relatively fast changes in a power metric of the data representative of the acoustic energy and a second estimate based on relatively slow changes in a power metric of the data representative of the acoustic energy;
determining whether voice activity is present in the acoustic energy based on the power estimate for the at least one band.
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Accused Products
Abstract
A microphone assembly includes an acoustic sensor and a voice activity detector on an integrated circuit coupled to an external-device interface. The acoustic sensor produces an electrical signal representative of acoustic energy detected by the sensor. A filter bank separates data representative of the acoustic energy into a plurality of frequency bands. A power tracker obtains a power estimate for at least one band, including a first estimate based on relatively fast changes in a power metric of the data and a second estimate based on relatively slow changes in a power metric of the data. The presence of voice activity in the electrical signal is based upon the power estimate.
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Citations
20 Claims
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1. A method in a microphone assembly including an acoustic sensor and a voice activity detector on an integrated circuit coupled to an external-device interface of the microphone assembly, the method comprising:
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receiving acoustic energy at the acoustic sensor; filtering data representative of the acoustic energy into a plurality of bands; obtaining a power estimate for at least one of the plurality of bands, the power estimate including a first estimate based on relatively fast changes in a power metric of the data representative of the acoustic energy and a second estimate based on relatively slow changes in a power metric of the data representative of the acoustic energy; determining whether voice activity is present in the acoustic energy based on the power estimate for the at least one band. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A microphone assembly having an external-device interface, the microphone assembly comprising:
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an acoustic sensor having an acoustic input and an electrical output; a filter bank having an input coupled to the electrical output of the transducer, the filter bank configured to filter data representative of energy detected by the acoustic sensor into a plurality of frequency bands; a power tracker having an input coupled to an output of the filter bank, the power tracker configured to obtain a power estimate for at least one of the plurality of frequency bands, the power estimate including a first estimate based on relatively fast changes in a power metric of the data representative of the acoustic energy and a second estimate based on relatively slow changes in a power metric of the data representative of the acoustic energy; a comparison entity coupled to the output of the power tracker, the comparison entity configured to determine whether voice activity is present in the data representative of acoustic energy based upon the power estimate; and a signal generator configured to generate a wake up signal upon determining that voice activity is present in the data representative of acoustic energy. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A microphone assembly having an external-device interface, the microphone assembly comprising:
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an acoustic sensor having an acoustic input and an electrical output; an analog to digital (A/D) converter coupled to the acoustic sensor, the A/D converter configured to generate a data representative of an electrical signal generated by the acoustic sensor; a processor coupled to the A/D converter, the processor configured to; filter the data representative of the electrical signal into a plurality of bands; obtain a power estimate for at least one of the plurality of bands, the power estimate including a first estimate based on relatively fast changes in a power metric of the data representative of the acoustic energy and a second estimate based on relatively slow changes in a power metric of the data representative of the acoustic energy; determine whether voice activity is present in the data representative of the electrical signal based upon the power estimate; and generate a wake up signal upon determining that voice activity is present in the data representative of the electrical signal. - View Dependent Claims (17, 18, 19, 20)
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Specification