发明名称 |
APPARATUS AND METHOD FOR DIGITAL SIGNAL CONVERSION |
摘要 |
PROBLEM TO BE SOLVED: To generate a PWM signal more closely approximating a PWM signal with respect to a polarity inverted signal of an analog signal by interpolating a polarity inverted signal of an input digital signal to generate a second PWM signal, to obtain tri-state value PWM modulation for attaining reduction in even-order nonlinear distortion and the enhancement of power efficiency and to reduce quantization noise at an audible band when an input signal is a digital signal. SOLUTION: A digital signal converter 2 includes: an over-sampling circuit 21 for sampling a received digital signal by using a high frequency; a polarity inverting circuit 22 for inverting the polarity of the sampled digital signal; interpolation circuits (A)23 and (B)24 for interpolating the respective digital signals; noise shaping circuits (A)25 and (B)26 for shaping the noise of the interpolated signals; PWM conversion circuits (A)27 and (B)28 for applying PWM conversion to a signal whose noise is shaped; and a switching circuit 29 for driving a load on the basis of the PWM signals from the PWM conversion circuits (A)27 and (B)28. COPYRIGHT: (C)2004,JPO
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申请公布号 |
JP2004032501(A) |
申请公布日期 |
2004.01.29 |
申请号 |
JP20020187745 |
申请日期 |
2002.06.27 |
申请人 |
PIONEER ELECTRONIC CORP |
发明人 |
KOMAMURA TERUYA;YAMAUCHI KEIICHI |
分类号 |
H03M1/82;H03M3/02;H03M5/08;(IPC1-7):H03M3/02 |
主分类号 |
H03M1/82 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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