Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2011-06-28
2011-06-28
Kuntz, Curtis (Department: 2614)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S097000, C381S313000, C381S356000
Reexamination Certificate
active
07970152
ABSTRACT:
The phase differences of microphones of a hearing aid microphone are to be reduced. To do this, the level of an output signal of a directional microphone is compared with an omnidirectional signal. If the level of the output signal of the differential directional microphone is above the level of the omnidirectional signal, this level difference is minimized by an adaptive, frequency-selective transit time compensation in individual frequency bands and phase matching of the microphones is thus achieved. By means of an alternative method, microphone matching is achieved in that the measurable delay of the two microphone signals is adaptively limited in individual frequency bands to a maximum value corresponding to the sound transit time between the microphones. Phase matching without knowing the position of a sound source can thus be achieved.
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Fischer Eghart
Puder Henning
Elbin Jesse A
Kuntz Curtis
Siemens Audiologische Technik GmbH
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