发明授权
- 专利标题: Digital broadcasting receiver
- 专利标题(中): 数字广播接收机
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申请号: US09554690申请日: 2000-05-18
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公开(公告)号: US06748037B1公开(公告)日: 2004-06-08
- 发明人: Hisakazu Katoh , Akinori Hashimoto , Kenichi Shiraishi , Akihiro Horii , Shoji Matuda
- 申请人: Hisakazu Katoh , Akinori Hashimoto , Kenichi Shiraishi , Akihiro Horii , Shoji Matuda
- 优先权: JP9/348719 19971204
- 主分类号: H04L2706
- IPC分类号: H04L2706
摘要:
A digital broadcasting receiver is provided which can reproduce a carrier quickly and capture a desired signal at high speed. A carrier reproduction phase error detection circuit (6) detects a phase error voltage in accordance with a demodulation output obtained by demodulating a demodulated wave of a modulated wave during a predetermined section in a header section. A peak number calculation circuit (92) calculates an error frequency between a desired reception frequency and a reproduction carrier frequency in accordance with the phase error voltage. A differential coefficient calculation circuit (94) calculates the polarity of the error frequency. A step frequency control circuit (96) converts the calculated error frequency having the calculated polarity into a step frequency width for automatic frequency control. The reproduction carrier frequency is scanned at the converted step frequency width until a frame sync is established after the frame sync is detected. It is therefore possible to reproduce the carrier quickly and capture the desired signal at high speed.