发明授权
US5831488A Digital phase modulator formed with a fixed-point digital signal
processor
失效
数字相位调制器用定点数字信号处理器形成
- 专利标题： Digital phase modulator formed with a fixed-point digital signal processor
- 专利标题（中）： 数字相位调制器用定点数字信号处理器形成
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申请号： US801728申请日： 1996-06-27
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公开(公告)号： US5831488A公开(公告)日： 1998-11-03
- 发明人: Michio Nakajima , Weimin Sun
- 申请人： Michio Nakajima , Weimin Sun
- 申请人地址： JPX Osaka
- 专利权人： Icom Incorporated
- 当前专利权人： Icom Incorporated
- 当前专利权人地址： JPX Osaka
- 优先权： JPX8-008322 19960122
- 主分类号： H03H17/02
- IPC分类号： H03H17/02 ; H03C3/00 ; H04L27/20
摘要：
Data from an A/D converter is supplied to a fixed-point DSP. The fixed-point DSP adjusts the level of the data x so that computed results do not exceed .+-.1. In succession, for the i-th data x.sub.i, the fixed-point DSP computes cos .pi..multidot.x.sub.i when i=1, 5, . . . , -sin .pi..multidot.x.sub.i when i=2, 6, . . . , -cos .pi..multidot.x.sub.i when i=3, 7, . . . and sin .pi..multidot.x.sub.i when i=4, 8, . . . and outputs a digital phase modulated signal y(t) by outputting the computed results in order. Trigonometrical functions are computed by expanding them to a series so that the intermediate computed results do not exceed .+-.1.
公开/授权文献
- USD341017S Coin entry 公开/授权日：1993-11-02