发明公开
- 专利标题: Digital-to-analog converter device
- 专利标题(中): 数字到模拟转换器设备
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申请号: EP84101289申请日: 1984-02-08
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公开(公告)号: EP0118762A3公开(公告)日: 1988-06-08
- 发明人: Kobayashi, Masaharu Hitachi-Hachimanyama , Noguchi, Takaharu , Nishimura, Keizo , Tanaka, Hiromichi , Nishida, Masami , Arai, Takao
- 申请人: HITACHI, LTD.
- 专利权人: HITACHI, LTD.
- 当前专利权人: HITACHI, LTD.
- 优先权: JP4065883 19830314
- 主分类号: H03K13/02
- IPC分类号: H03K13/02
摘要:
A digital-to-analog converter device for PCM signals at different sampling frequencies (f s1 , f s2 . f s3 ) comprises a signal converter (6a) which expands the frequency distance between a PCM signal band and a side band by converting the sampling frequencies associated with the PCM signals to be reproduced into higher fequencies (2f s1 , 2f s2 ; f s3 ') ' With this signal converter, a single low-pass filter (4a) can be simplfied, having a gradual ramp cut-off characteristic for removal of the side band wherein a pass band cut-off frequency and a stop band cut-off frequency can be adapted for low pass filtering of the PCM signals at different sampling frequencies.
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