Filter bank for frequency demultiplexing in multiple channels
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United States of America Patent
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Jan 23, 1990
Grant Date -
N/A
app pub date -
May 13, 1988
filing date -
May 14, 1987
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Expired
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Abstract
A filter bank for frequency demultiplexing or multiplexing, respectively, of L channel signals. The filter bank is composed of L transversal filters (non-recursive filters, that is filters having an impulse response of finite duration having complex valued coefficients, for real value input signals and complex value output signals and vice versa and a sampling rate at the output which is reduced or increased, respectively, by a factor of M. At least one of the L filters is realized by cascading at least two filters each having complex valued coefficients; in each one of these filters F.sub.1, . . . F.sub.q, . . . F.sub.Q, the sampling rate is reduced or increased, respectively, by a factor of M.sub.1 >1 and ##EQU1## In the case of demultiplexing, the filter bank is arranged so that the input filters of each cascade receives a real value input signal and puts out a complex value output signal. The other filters of each cascade each receive a complex value input signal and put out a complex value output signal. In the case of multiplexing, the filter bank is arranged so that the first Q-1 filters of each cascade receive a complex value input signal and put out a complex value output signal and the output filter of each cascade receive a complex value input signal and put out a real value output signal.
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Patent Owner(s)
- ANT NACHRICHTENTECHNIK GMBH
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Gockler, Heinz | Elbinger Strasse 52, D-7150 Backnang, DE | 19 | 238 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
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