MICROPHONE CIRCUIT ASSEMBLY AND SYSTEM WITH SPEECH RECOGNITION
First Claim
1. A microphone circuit assembly for connection to an external application processor, comprising:
- a microphone preamplifier comprising an input terminal for receipt of a microphone signal,an analog-to-digital converter configured for receipt of an output signal of the microphone preamplifier and generation of corresponding microphone signal samples at a first predetermined sample rate,a speech feature extractor configured for receipt and processing of predetermined blocks of the microphone signal samples to extract speech feature vectors representing speech features of the microphone signal samples,a speech vocabulary comprising a target word or target phrase of human speech encoded as a set of target feature vectors,a controller comprising a decision circuit configured to compare the speech feature vectors generated by the speech feature extractor with the target feature vectors to detect the target speech word or phrase,the controller being configured to generate a recognition signal on an externally accessible output terminal in response to a recognized target word or phrase in the microphone signal samples.
4 Assignments
0 Petitions
Accused Products
Abstract
A microphone circuit assembly for an external application processor, such as a programmable Digital Signal Processor, may include a microphone preamplifier and analog-to-digital converter to generate microphone signal samples at a first predetermined sample rate. A speech feature extractor is configured for receipt and processing of predetermined blocks of the microphone signal samples to extract speech feature vectors representing speech features of the microphone signal samples. The microphone circuit assembly may include a speech vocabulary comprising a target word or target phrase of human speech encoded as a set of target feature vectors and a decision circuit is configured to compare the speech feature vectors generated by the speech feature extractor with the target feature vectors to detect the target speech word or phrase.
68 Citations
27 Claims
-
1. A microphone circuit assembly for connection to an external application processor, comprising:
-
a microphone preamplifier comprising an input terminal for receipt of a microphone signal, an analog-to-digital converter configured for receipt of an output signal of the microphone preamplifier and generation of corresponding microphone signal samples at a first predetermined sample rate, a speech feature extractor configured for receipt and processing of predetermined blocks of the microphone signal samples to extract speech feature vectors representing speech features of the microphone signal samples, a speech vocabulary comprising a target word or target phrase of human speech encoded as a set of target feature vectors, a controller comprising a decision circuit configured to compare the speech feature vectors generated by the speech feature extractor with the target feature vectors to detect the target speech word or phrase, the controller being configured to generate a recognition signal on an externally accessible output terminal in response to a recognized target word or phrase in the microphone signal samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification