NOISE REDVIDING RECEIVER DEVICE

• Main Authors: SASAKI, TOORU, OKUBO MASASHI, KIMURA, AKIRA
• Format: Patent
• Language: English; Korean
• Published: 01.10.1998
• Edition: 6
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PHYSICS; SOUND-PRODUCING DEVICES

The present invention is concerned with a receiver device for converting electrical signal from a headphone, a telephone receiver or the like into acoustic signals and outputting these acoustic signals. More particularly, it relates to a noise reducing receive device in which acoustic signals in the vicinity of an electro-acoustic transducer element are converted by a microphone into electrical signals and negatively fed back to an amplifier circuit which is adapted for amplifying input electrical signals and supplying the amplified signals to the electro-acoustic transducer element. With the present noise reducing receiver device, the input electrical signals are amplified by the amplifier circuit and converted by the electro-acoustic transducer element into acoustic signals, which are output as output acoustic signals. A microphone, consisting of a pair of microphone units (16A,16B) having their diaphragms (16a,16b) disposed in proximity and in opposition to each other, is arranged in the vicinity of the electro-acoustic transducer element and adapted for converting the output acoustic signals and external noises into electrical signals, which are negatively fed back to the amplifier circuit via feedback circuit. The output acoustic signals may be heard at the desired noise reduction level by having the transfer function H of the electro-acoustic transducer element, the transfer function A of the amplifier circuit, the transfer function M of the microphone and the transfer function beta of the feedback circuit presettable within the range of ¦AHM beta ¦>>1.