초록 ▼

A system insensitive to nonspeech sounds utilizes a pair of spatially separated microphones to obtain the direction of origin of speech signals from a common sound source. The speech signal from each microphone is transformed into a pulse representative signal having a rapid increase responsive to p

A system insensitive to nonspeech sounds utilizes a pair of spatially separated microphones to obtain the direction of origin of speech signals from a common sound source. The speech signal from each microphone is transformed into a pulse representative signal having a rapid increase responsive to pitch peaks of energy from the sound source. The cross correlation of these pulses accurately reflects the phase relationship between the speech signals arriving at the microphones. The cross correlation is implemented as time interval histograms which are periodically read to identify the direction of the common sound source.

대표청구항 ▼

A signal processing arrangement having first and second spatially separated sound detecting devices responsive to sound from a common sound source, the arrangement comprising: means for providing a first pulse and a second pulse corresponding to an energy burst of sound detected in the detecting dev

A signal processing arrangement having first and second spatially separated sound detecting devices responsive to sound from a common sound source, the arrangement comprising: means for providing a first pulse and a second pulse corresponding to an energy burst of sound detected in the detecting devices, the first and second pulses respectively originating from the first and second sound detecting devices; means jointly responsive to the first and second pulse for determining a phase relationship between the energy burst of sound; and both a predetermined sound threshold level and energy burst storage means, an output signal reflecting the origin of the common sound source being provided in response to both the phase relationship of the energy bursts and the accumulated value of multiple energy bursts within a predetermined time period exceeding the value of the predetermined sound threshold level.