发明授权
US5578948A Harmonic tone generator for low level input audio signals and small
amplitude input audio signals
失效
用于低电平输入音频信号和小幅度输入音频信号的谐波音产生器
- 专利标题： Harmonic tone generator for low level input audio signals and small amplitude input audio signals
- 专利标题（中）： 用于低电平输入音频信号和小幅度输入音频信号的谐波音产生器
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申请号： US819987申请日： 1992-01-13
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公开(公告)号： US5578948A公开(公告)日： 1996-11-26
- 发明人: Soichi Toyama
- 申请人： Soichi Toyama
- 申请人地址： JPX Tokyo
- 专利权人： Pioneer Electronic Corporation
- 当前专利权人： Pioneer Electronic Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX3-158915 19910628
- 主分类号： G10H1/12
- IPC分类号： G10H1/12 ; G10H1/16 ; G10K15/04 ; H03B19/00 ; H03B28/00 ; G10H7/00
摘要：
A harmonic tone generator produces a harmonics signal even for input audio signals of a small amplitude. Conversion of a digitized audio signal in accordance with a predetermined non-linear function is performed also for an audio signal of a small amplitude. According to the second aspect of the invention, a level difference between the digital audio signal level in the present sampling time and the audio signal level in the preceding sampling time is detected and the detected level difference is converted to an output value in accordance with a predetermined non-linear function by a non-linear converting circuit. The converted output value is accumulated. According to the third aspect of the invention, the detected level difference is converted to a function conversion output in accordance with a predetermined function by a non-linear converting circuit. A gain of an amplifier to amplify the audio signal in the present sampling time is changed in accordance with the function conversion output.
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