Voice recognition system

Claim 2

A speech recognition system comprising: an audio sensing circuit conformed to provide a sequence of pulses each of a length corresponding to the length of an audio wave; buffer memory means conformed to receive and store a sequence of count codes each corresponding to the length of a respective one of said pulses; and sorting means operatively connected to receive said count codes from said buffer memory means and conformed to sort said count codes into preselected class intervals of count groups, said class intervals of count groups being selected to include a substantially equal number of pulses produced in the course of speech.

Claim 3

Apparatus according to claim 1 wherein: said audio sensing circuit includes a bandpass filter conformed to pass the frequency bands associated with human speech.

Claim 6

A method according to claim 3 wherein said step of producing a serial stream further comprises the steps of: accumulating said count codes to produce a sum thereof; dividing said sum by a predetermined integer number to produce segments of count codes; and selecting said serial stream of count codes from each segment.

Claim 7

A method according to claim 3 further comprising: comparing the count codes of a word uttered by the user and selected according to said segments and sorted according to said intervals with said stored selected and sorted count codes.

Claim 8

Apparatus for providing a predetermined response signal uniquely associated with the reception of a particular word uttered by a user comprising: a microphone deployed to sense the audio waves characterizing each said word for producing an electrical signal indicative thereof; filtering means connected to receive said electrical signal for producing an output signal attenuated in selected frequency components thereof; pulse generating means connected to said filtering means for producing a sequence of pulses each of a length corresponding to the duration between zero amplitude crossings of said output signal; and signal processing means connected to receive said sequence of pulses from said pulse generating means, said signal processing means including: (a) pulse length counting means connected to receive each said pulse for producing a count code byte of a code corresponding to the length of said pulse at the completion of each said pulse; (b) sorting means operatively connected to receive said count code bytes for sorting thereof into predetermined intervals of count code and for storing the number of bytes sorted in each said interval said count code intervals being each selected to include a substantially equal number of count bytes accumulated for all said byte number patterns; (c) memory means conformed to store reference byte number patterns in accordance with said intervals; and (d) comparison means connected to receive said byte numbers sorted in accordance with said intervals in said sorting means and said reference byte number patterns for producing said response signal upon a coincidence therebetween within a predetermined tolerance.

Claim 9

Apparatus for providing a predetermined response signal uniquely associated with the reception of a particular word uttered by a user comprising: a microphone deployed to sense the audio waves characterizing each said word for producing an electrical signal indicative thereof; filtering means connected to receive said electrical signal for producing an output signal attenuated in selected frequency components thereof; pulse generating means connected to said filtering means for producing a sequence of pulses each of a length corresponding to the duration between zero amplitude crossings of said output signal; and signal processing means connected to receive said sequence of pulses from said pulse generating means, said signal processing means including: (a) pulse length counting means connected to receive each said pulse for producing a count code byte of a code corresponding to the length of said pulse at the completion of each said pulse; (b) sorting means operatively connected to receive said count code bytes for sorting thereof into predetermined intervals of count code and for storing the number of bytes sorted in each said interval said count code intervals being each selected to include a substantially equal number of count bytes accumulated for all said byte number patterns; (c) memory means conformed to store reference byte number patterns in accordance with said intervals; and (d) comparison means connected to receive said byte numbers sorted in accordance with said intervals in said sorting means and said reference byte number patterns for producing said response signal upon a coincidence therebetween within a predetermined tolerance.

Claim 10

Apparatus according to claim 6 wherein: said filtering means is selected to pass frequencies between 300 and 3000 cycles per second and to attenuate all other frequencies.

Claim 11

Apparatus according to claim 7 wherein: said count code intervals are each selected to include a substantially equal number of count code bytes accumulated for all said byte number patterns.

Claim 12

Apparatus according to claim 8 wherein: said filtering means is selected to pass frequencies between 300 and 3000 cycles per second and to attenuate all other frequencies.