发明名称 |
AUDIO SIGNAL AMPLIFICATION DEVICE |
摘要 |
An audio signal amplification device of the disclosure includes: a delta-sigma modulation part configured to resample an input digital audio signal with a quantization number smaller than a quantization number of the digital audio signal; a pulse-width modulation part configured to convert an output signal from the delta-sigma modulation part into a pulse-width modulation signal which sets a gradation of the output signal in an amplitude direction at a gradation of a pulse width; a power amplification part configured to perform power amplification on an output signal from the pulse-width modulation part; a low-pass filter configured to diminish a component higher than a predetermined cutoff frequency, in an output signal from the power amplification part, and to output the resultant signal; and a correction processing part configured to generate a correction signal for correcting the digital audio signal. The correction processing part includes a switch configured to control coupling of the correction processing part to the low-pass filter. When the switch is on, the correction processing part couples a loudspeaker to the low-pass filter, and generates the correction signal. |
申请公布号 |
US2016323669(A1) |
申请公布日期 |
2016.11.03 |
申请号 |
US201615206274 |
申请日期 |
2016.07.10 |
申请人 |
Panasonic Intellectual Property Management Co., Ltd. |
发明人 |
IWATA KAZUYA |
分类号 |
H04R3/04;G10L21/0208;H03F3/183;H03F3/217;H03F1/34 |
主分类号 |
H04R3/04 |
代理机构 |
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代理人 |
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主权项 |
1. An audio signal amplification device comprising:
a delta-sigma modulation part configured to resample an input digital audio signal with a quantization number smaller than a quantization number of the digital audio signal; a pulse-width modulation part configured to convert an output signal from the delta-sigma modulation part into a pulse-width modulation signal which sets a gradation of the output signal in an amplitude direction at a gradation of a pulse width; a power amplification part configured to perform power amplification on an output signal from the pulse-width modulation part; a low-pass filter configured to diminish a component higher than a predetermined cutoff frequency, in an output signal from the power amplification part, and to output the resultant signal; and a correction processing part configured to generate a correction signal for correcting the digital audio signal, wherein the correction processing part includes a switch configured to control coupling of the correction processing part to the low-pass filter, and when the switch is on, the correction processing part couples to the low-pass filter, and generates the correction signal. |
地址 |
Osaka JP |