发明名称 |
Carrier phase controller for a receiver of phase modulated signals |
摘要 |
A simplified carrier phase control apparatus used in a modem for demodulating a quadrature amplitude modulated data signal, to correct phase jitters of a carrier signal due to a 50 Hz or a 60 Hz frequency of the commercial power supply, and its harmonic wave frequency components. The carrier phase control apparatus has a predictive filter for predicting a carrier phase jitter, the predictive filter composed of band-pass filters with center frequencies of 50 Hz and 60 Hz, and a circuit where the output signals of the band-pass filters are multiplied by the coefficients and added linearly.
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申请公布号 |
US4926499(A) |
申请公布日期 |
1990.05.15 |
申请号 |
US19870122318 |
申请日期 |
1987.11.18 |
申请人 |
HITACHI, LTD. |
发明人 |
KOBAYASHI, NAOYA;OHNISHI, MAKOTO;KOKURYO, YOSHIRO |
分类号 |
H03H15/00;H04B3/04;H04L27/00;H04L27/233;H04L27/38 |
主分类号 |
H03H15/00 |
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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