US 10,373,608 B2Granted

Time-based frequency tuning of analog-to-information feature extraction

AssigneeTexas Instruments Incorporated

InventorsZhenyong Zhang, Wei Ma

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Abstract

A sound recognition system including time-dependent analog filtered feature extraction and sequencing. An analog front end (AFE) in the system receives input analog signals, such as signals representing an audio input to a microphone. Features in the input signal are extracted, by measuring such attributes as zero crossing events and total energy in filtered versions of the signal with different frequency characteristics at different times during the audio event. In one embodiment, a tunable analog filter is controlled to change its frequency characteristics at different times during the event. In another embodiment, multiple analog filters with different filter characteristics filter the input signal in parallel, and signal features are extracted from each filtered signal; a multiplexer selects the desired features at different times during the event.

Claims8

Dependent claims

An audio recognition circuit, comprising:

a first analog filter for filtering an analog signal using a first frequency characteristic over a first interval of a particular duration;
a second analog filter for filtering the analog signal using a second frequency characteristic different from the first frequency characteristic over a second interval of the particular duration differing from the first interval of the particular duration;
first feature extraction circuitry for extracting a first analog signal feature from the analog signal filtered by the first analog filter and corresponding to the first interval;
second feature extraction circuitry for extracting a second analog signal feature from the analog signal filtered by the second analog filter and corresponding to the second interval;
a multiplexer for outputting a feature sequence comprising the extracted first and second analog signal features;
an analog-to-digital converter for digitizing the feature sequence;
and
an event trigger for issuing an event trigger signal responsive to the feature sequence matching a particular feature sequence according to a matching criterion.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/920,210Filed 22 Oct 2015
Published: US 2017/0116980 A127 Apr 2017
Granted: 6 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G10L 15/02
Speech recognition: feature extraction for speech recognition; Selection of recognition unit
G10L 15/22
Speech recognition: procedures used during a speech recognition process, e.g. man-machine dialogue
G10L 15/30
Constructional details of speech recognition systems: distributed recognition, e.g. in client-server systems, for mobile phones or network…
G10L 15/32
Constructional details of speech recognition systems: multiple recognisers used in sequence or in parallel; Score combination systems therefor,…

Family

US 2017/0116980 A1Pre-grant publication · published 27 Apr 2017
US 10,373,608 B2This patent

From the US filing history. Foreign family members aren’t listed.

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