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US 4,284,846 AGranted
System and method for sound recognition
OwnerJohn Marleyinventor
Life of this patent
Estimating the term…
Abstract
Sounds produced by human or mechanical sources are recognized by comparison of certain waveform characteristic ratios with prestored ratios. Transitions and transition glides of characteristics are used to select certain stored groups of ratios for comparing.
Claims10
A method for producing a signal representing a characteristic sound contained in a stream of sound signals, said method comprising the steps of:
- (a) producing a first sequence of analog signals representing said sound signals;
- (b) operating upon said first sequence of analog signals to detect portions of said analog signals undergoing major slope changes and producing a sequence of digital pulses, the edges of said digital pulses corresponding in time to the beginnings and ends of said portions of said analog signals;
- (c) operating upon said sequence of digital pulses to detect major slope transistions of said analog signals;
- (d) measuring time intervals between predermined ones of said detected major slope transitions;
- (e) computing a plurality of waveform characteristic ratios between predetermined ones of said time intervals;
- (f) comparing said waveform characteristic ratios with a plurality of stored characteristic ratios to determine if said waveform characteristic ratios match any of said stored characteristic ratios;
- and
- (g) producing a signal representing a sound corresponding to a matching one of said characteristic ratios.
5 more elements
A system for producing a signal representing a characteristic sound contained in a stream of sound signals, said system comprising:
- (a) first means for producing a first sequence of analog signals representing said sound signals;
- (b) means for operating upon said first sequence of analog signals to detect portions of said analog signals undergoing major slope changes and producing a sequence of digital pulses, the edges of said digital pulses corresponding in time substantially to the beginnings and ends of said portions of said analog signals;
- (c) means for operating upon said sequence of digital pulses to detect major slope transitions of said analog signals;
- (d) means for measuring time intervals between predetermined ones of said detected major slope transitions;
- (e) means for computing a plurality of waveform characteristic ratios between predetermined ones of said time intervals;
- (f) means for comparing said waveform characteristic ratios with a plurality of stored characteristic ratios to determine if said waveform characteristic ratios match any of said stored characteristic ratios;
- and
- (g) means for producing a signal representing a sound corresponding to a matching one of said characteristic ratios.
5 more elements
Dependencies are inferred from the claim text.