发明授权
- 专利标题: Pulse width modulator and pulse width modulation method
- 专利标题(中): 脉宽调制器和脉宽调制方法
-
申请号: US10464485申请日: 2003-06-19
-
公开(公告)号: US07224728B2公开(公告)日: 2007-05-29
- 发明人: Mitsuya Komamura
- 申请人: Mitsuya Komamura
- 申请人地址: JP Tokyo
- 专利权人: Pioneer Corporation
- 当前专利权人: Pioneer Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Arent Fox LLP
- 优先权: JP2002-188319 20020627
- 主分类号: H03K7/08
- IPC分类号: H03K7/08
摘要:
A pulse width modulator for producing a PWM signal having reduced nonlinear distortion through interpolation processing with fewer computation steps is provided. The computational processing, W={1+α(X2−X1)}{0.25 (X1+X2)}+0.5, is performed in accordance with successive sample values (X1, X2) in a PCM data train to determine a weighting factor (W). The computational processing, Xq=0.5·X0(W2−W)+X1(1−W2)+0.5·X2(W2+W), is performed using the sample values (X1, X2), a sample value (X0) previous to the sample value (X1), and the weighting factor (W) to thereby determine an interpolated sample value (Xq) having an amplitude close to that of an original analog signal (X(t)) generating the PCM data train. A point in time (tq) at which a reference signal (R(t)) takes on the interpolated sample value (Xq) is then determined to produce a PWM signal (Spwm) which is logically inverted at the point in time (tq).
公开/授权文献
- US20040213343A1 Pulse width modulator and pulse width modulation method 公开/授权日:2004-10-28
信息查询