Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent
1993-02-16
1994-01-04
Peng, John K.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
381 25, 381 71, 381 72, 381183, H04R 110
Patent
active
052767400
ABSTRACT:
An earphone device includes an acoustic tube having an inner diameter substantially identical to that of the external auditory canal has an ear mounting portion at one end and an acoustic non-reflecting portion at the outer end. An earphone unit and an internal microphone unit are mounted on the periphery of the acoustic tube adjacent each other and communicate with the interior of the acoustic tube with their respective vibration plates facing inwardly of the tube. The phase of the signal representing the external noise in the acoustic tube picked up by the internal microphone unit is reversed and combined with the audio signal fed to the earphone unit. The earphone device also includes an external microphone unit on the outside of the acoustic tube and a variable ratio mixing circuit for mixing the input audio program signal, the reversed phase signal obtained from the internal microphone unit, and the signal from the external microphone unit, so that external sounds can be heard without removing the earphone device.
REFERENCES:
patent: 4173715 (1979-11-01), Gosman
patent: 4455675 (1984-06-01), Bose et al.
patent: 4833719 (1989-05-01), Carme et al.
patent: 4864610 (1989-09-01), Stevens
patent: 4972492 (1990-11-01), Tanaka et al.
patent: 5001763 (1991-03-01), Moseley
patent: 5022486 (1991-06-01), Miura et al.
Iida Yasuhiro
Inanaga Kiyofumi
Kimura Akira
Sogawa Hiroyuki
Eslinger Lewis H.
Lefkowitz Edward
Maioli Jay H.
Peng John K.
Sony Corporation
LandOfFree
Earphone device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Earphone device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Earphone device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-313654