Microphone unit comprising integrated speech analysis
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsJohn Paul LESSO, John Laurence MELANSON
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Abstract
A microphone unit has a transducer, for generating an electrical audio signal from a received acoustic signal; a speech coder, for obtaining compressed speech data from the audio signal; and a digital output, for supplying digital signals representing said compressed speech data. The speech coder may be a lossy speech coder, and may contain a bank of filters with centre frequencies that are non-uniformly spaced, for example mel frequencies.
Claims73
A microphone unit, comprising:
- a transducer, for generating an electrical audio signal from a received acoustic signal;
- a speech coder, for obtaining compressed speech data from the audio signal;
- and
- a digital output, for supplying digital signals representing said compressed speech data.
A microphone unit, comprising:
- a transducer, for generating an audio signal;
- a bit rate compression block, for obtaining bit-rate compressed data from the audio signal;
- and
- a digital output, for supplying digital signals representing said bit-rate compressed data.
A microphone unit, comprising:
- a transducer, for generating an audio signal;
- a speech feature extraction block, for obtaining speech feature values from the audio signal;
- and
- a digital output, for supplying digital signals representing said speech feature values.
A microphone unit, comprising:
- a transducer, for generating an audio output signal;
- a feature extraction block, for deriving speech features from the audio output signal;
- and
- a digital output, for driving digital data representing said speech features over a digital data line.
A microphone unit, comprising:
- a transducer, for generating an audio output signal;
- a feature extraction block, for deriving speech features from the audio output signal;
- and
- a digital output, having a first mode for driving digital data representing said audio output over a digital data line at a first data rate, and having a second mode for driving digital data representing said derived features over a digital data line at a second data rate.
A microphone unit, comprising:
- a transducer, for generating an audio output signal;
- a digitiser, for generating a stream of digitised values representing said audio output signal;
- a feature extraction block, for deriving speech features from the audio output signal;
- and
- a digital output, having a first mode for driving said stream of digitised values over a digital data line at a first data rate, and having a second mode for driving digital data representing said derived features over a digital data line at a second data rate.
A digital microphone capable of operating in two modes:
- a first ADC mode where the output is a digital version of the analogue input signal;
- and
- a second AIC mode where the output is coded using the fact that input signal has a sparse representation in a given domain.
An audio processing system, comprising:
- a microphone unit and an audio processing unit, wherein the microphone unit and the audio processing unit are connectable by means of a wired connection,
- wherein the microphone unit comprises:
- a transducer, for generating an audio output signal;
- a feature extraction block, for deriving speech features from the audio output signal;
- and
- a digital output, for driving digital data representing said speech features over the wired connection.
Dependencies are inferred from the claim text.