发明名称 |
Transversal filter for use in a digital subscriber line transmission interface |
摘要 |
A transversal filter has a transfer function for which a zero point occurs outside a unit circle on z plane and thus the output waveform has a ringing characteristic having a change from negative to positive around a precursor and before a main cursor and is associated and integrated with another transversal filter, thereby forming a waveform shaping decimation filter or a pulse shaping high-pass filter. The waveform decimation filter can eliminate a high frequency noise, changes a high frequency input data to a low frequency output data, and performs a waveform shaping operation. Therefore it cannot require a pulse shaping filter separated from the decimation filter. The pulse shaping high-pass filter includes a pulse shaping filter whose number of the taps is decreased and performs high-pass filter function. A pulse shaping filter whose number of the taps is decreased can be used separately from the high-pass filter.
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申请公布号 |
US5367540(A) |
申请公布日期 |
1994.11.22 |
申请号 |
US19930004895 |
申请日期 |
1993.01.19 |
申请人 |
FUJITSU LIMITED |
发明人 |
KAKUISHI, MITSUO;MIKYOSHI, SEIJI;ITOKAWA, HIROAKI;KOIZUMI, NOBUKAZU;AWATA, YUTAKA;KUROSAKI, YUKO |
分类号 |
H03H17/04;(IPC1-7):H04B1/10 |
主分类号 |
H03H17/04 |
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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