Method to determine the transfer characteristic of a...

Details Method to determine the transfer characteristic of a... Method to determine the transfer characteristic of a...

2005-03-08

2005-03-08

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S122000

Reexamination Certificate

active

06865275

ABSTRACT:
Two output signals (O1aand O1b) of a microphone system (1) depend in different manner on the angle of incidence (φ) of acoustic signals and are divided one by the other (7). A mathematical product of the ratio (A7) and a weighting factor (α) is saturated (12) and subtracted from a signal value (A) which can be fed into the system. The subtraction remainder is multiplied (13) by that output signal from the microphone system (1) which also generates the denominator signal for the division (7). Depending on the weighting factor (a) of the saturation value (B) and on the subtraction value (A), a desired directional characteristic is implemented between the resultant signal (Sout) of the said multiplication and the angle of incidence (φ) of acoustic signals impacting the microphone system (1).

REFERENCES:
patent: 4752961 (1988-06-01), Kahn
patent: 5289544 (1994-02-01), Franklin
patent: 5473701 (1995-12-01), Cezanne et al.
patent: 2 242 790 (1974-03-01), None
patent: 197 30 878 (1998-01-01), None
patent: 2 076 152 (1981-11-01), None

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