H - Electricity – 03 – H
Patent
H - Electricity
03
H
328/0.7
H03H 17/06 (2006.01) H04B 1/66 (2006.01)
Patent
CA 1255361
PHD 85 317 ABSTRACT: In order to reduce the cost and design efforts in the transmission and storage of signals, it is necessary to operate the analysing and synthesizing filter bank with a maximum sampling rate reduction. For the special case of a two-channel filter bank a solution is known which is com- monly referred to as quadrature-mirror filtering, in which the occurring spectral aliasing components are compensated for in the synthesizing filter bank. By interconnecting the above-mentioned two-channel filter banks in accordance with a tree structure, a filter bank having a larger number of channels and a maximum sampling rate reduction can be realized. For the case in which a maximum sampling rate reduction in the filter bank is not required, the combina- tion of a digital polyphase network and a discrete Fourier transform processor can alternatively be used. In order to enable a maximum sampling rate reduction also when the above-mentioned combination is used, the M complex sub- band signals resulting from dividing the input signal with the aid of a digital polyphase network can be subjected to a further sampling rate reduction by a staggered sampling rate reduction of the real and the imaginary sub-signals. As a result, the aliasing distortions occurring at the maximum sampling rate reduction can again be compensated for in the synthesizing filter bank.
504575
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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