Amplifiers – Signal feedback – Frequency responsive feedback means
Patent
1982-04-28
1985-01-15
Mullins, James B.
Amplifiers
Signal feedback
Frequency responsive feedback means
330294, H03F 132
Patent
active
044940742
ABSTRACT:
Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm providing a feedback signal that is combined with the input electrical signal to be reproduced by the headphones to provide a combined signal that is power amplified for driving the diaphragm.
REFERENCES:
Ralph Smith, "Circuits Devices and Systems", pp. 744-745.
Bose Corporation
Hieken Charles
Mullins James B.
Wan G.
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