H - Electricity – 03 – G
Patent
H - Electricity
03
G
333/28
H03G 5/00 (2006.01) H03G 5/02 (2006.01)
Patent
CA 1223050
EQUALIZER NETWORKS AND METHODS OF DEVELOPING SCALING COEFFICIENTS THEREFOR Abstract of the Disclosure An adjustable equalizer network comprises a series chain of N all pass amplifier stages driving M minimum phase shift transversal filters connected to a final summing circuit that includes means to adjust each filter output to obtain a ripple free predetermined frequency response over a given frequency range. Each filter includes N+1 scaling circuits connected to an intermediate summing circuit; the scaling circuits have scaling coefficients, of magnitude and sign determined by Fourier analysis and an appropriate truncation function, such that the filter has a pass band representative of one of M contiguous bands conjointly encom- passing the frequency range. The adjustable equalizer, once adjusted for a desired frequency response, may be supplied with a DC reference input and used to determine the contri- bution (magnitude and sign) to the frequency response from each tap on the all pass chain, thus developing a set of N+1 scaling coefficients for a simplified equalizer network, com- prising the all pass chain with just one set of N+1 scaling circuits, that duplicates the response characteristic of the more complex adjustable equalizer. Some embodiments incor- porate digital programming and control of the frequency response characteristic.
464508
Industrial Research Products Inc.
Macrae & Co.
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