Speech recognition
AssigneeCirrus Logic, Inc.
InventorsJohn Paul Lesso, Robert James Hatfield
Life of this patent
Estimating the term…
Abstract
A speech recognition system comprises: an input, for receiving an input signal from at least one microphone; a first buffer, for storing the input signal; a noise reduction block, for receiving the input signal and generating a noise reduced input signal; a speech recognition engine, for receiving either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block; and a selection circuit for directing either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block to the speech recognition engine.
Claims4
A speech recognition system, comprising:
- an input, for receiving an input signal from at least one microphone;
- a first buffer, for storing the input signal;
- a noise reduction block, for receiving the input signal and generating a noise reduced input signal;
- a speech recognition engine, for receiving either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block;
- and
- a selection circuit for selecting between passing either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block to the speech recognition engine;
- wherein the speech recognition system has a pass-phrase validation function for determining from the input signal whether a trigger phrase has been spoken by an authorised user of the system, wherein the selection circuit is controlled to select passing the noise reduced input signal from the noise reduction block to the speech recognition engine only after the pass-phrase validation function has determined that the trigger phrase has been spoken by the authorised user of the system.
An integrated circuit for use in a speech recognition system, comprising:
- an input, for receiving an input signal from at least one microphone;
- a first buffer, for storing the input signal as a buffered input signal;
- a noise reduction block comprising a second buffer, for receiving the input signal and generating a buffered noise reduced input signal;
- and
- a selection circuit for selecting between passing either the buffered input signal or the buffered noise reduced input signal, such that either the stored input signal can be routed from the first buffer to a speech recognition engine, or the buffered noise reduced input signal can be routed from the second buffer to the speech recognition engine;
- wherein the speech recognition system has a pass-phrase validation function for determining from the input signal whether a trigger phrase has been spoken by an authorised user of the system, wherein the selection circuit is controlled to select passing the buffered noise reduced input signal from the noise reduction block to the speech recognition engine only after the pass-phrase validation function has determined that the trigger phrase has been spoken by the authorised user of the system.
Dependencies are inferred from the claim text.