Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic loudspeaker
Reexamination Certificate
2007-03-14
2011-12-20
Menz, Douglas (Department: 2891)
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With electrostatic loudspeaker
C381S111000
Reexamination Certificate
active
08081779
ABSTRACT:
An object is to provide an audio circuit in which flow of excessive current through a capacitive speaker and a drive circuit thereof can be prevented while degradation of sound quality of high-pitched tones is suppressed. The audio circuit for driving a capacitive speaker includes: a weighting circuit for performing weighting in conformity with frequency components of an audio signal; and a signal-voltage limiting compression circuit for compressing a signal, which is input to the drive amplifier or which has been output from the drive circuit, at a prescribed compression ratio in accordance with a difference voltage between the output signal of the weighting circuit and a preset threshold voltage when the weighted signal exceeds the threshold voltage. Alternatively, the audio circuit is provided with a signal-voltage limiting compression circuit for passing, with amplitudes unchanged, signal components below a prescribed frequency contained in the signal reproduced by the capacitive speaker and compressing amplitudes of signal components not less than the prescribed frequency at a prescribed compression ratio.
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Supplementary European Search Report for EP 07 73 8568 completed Sep. 21, 2011.
Hosokawa Satoshi
Kuroda Jun
Mori Ukyo
Murata Yukio
Menz Douglas
NEC Corporation
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