Title:
DIGITAL POWER AMPLIFIER, SPEAKER DRIVING SYSTEM, AND SPEAKER DRIVING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/195995
Kind Code:
A1
Abstract:
An operational amplifier (12) outputs a signal obtained by integrating sums of first audio signals inputted to an inverted input terminal and feedback signals outputted from a power amplification unit (14). A pulse width modulation unit (13) generates a PWM signal by pulse-width modulating the output from the operational amplifier (12). A demodulation unit (15) demodulates the PWM signal and generates a second audio signal (Sout) which is to be supplied to a speaker (50a) and which includes an audio signal band and a high-frequency band of the PWM signal higher than the audio signal band. A high-pass filter (25) removes a low-frequency component including the audio signal band in a current of the second audio signal. A current feedback circuit (26) feeds back a current component of the second audio signal, from which the low-frequency component has been removed, so as to be added to the first audio signal.
Inventors:
IGARI TOSHIFUMI (JP)
Application Number:
PCT/JP2021/046715
Publication Date:
September 22, 2022
Filing Date:
December 17, 2021
Export Citation:
Assignee:
JVCKENWOOD CORP (JP)
International Classes:
H04R3/00; H03F1/52; H03F3/217; H03F3/38; H03F3/68
Foreign References:
| JP2018088575A | 2018-06-07 | |||
| JP2016072877A | 2016-05-09 | |||
| JP2016072876A | 2016-05-09 |
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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