Programmable general purpose analog filter
First Claim
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1. A programmable general purpose filter comprising:
- input signal sampler means, having an input terminal and a plurality of output terminals, each output terminal providing a sample of an input signal applied to said input terminal;
reference signal sampler means having an input terminal and a plurality of output terminals, the number of output terminals being equal to the number of output terminals contained in said input signal sampler, each output terminal corresponding to one of said output terminals of said input signal sampler and providing a sample of a reference signal applied to said input terminal;
a plurality of multipliers equal in number to the number of output terminals of said input signal sampler, each multiplier being coupled to an output terminal of said input signal sampler and to said corresponding output terminal of said reference signal sampler, each of said multipliers having an output terminal at which a signal representative of the multiplication of said input signal sample by said reference signal sample is provided; and
summation means coupled to each of said output terminals of said plurality of multipliers for providing a signal representative of the sum of the products of said input signal samples by said reference signal samples, said sum being the sampled output response to said sampled input signal of a programmed filter defined by said sampled reference signal.
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Abstract
A programmable transversal filter employig two charge transfer delay lines one for sampling a reference function, the samples providing the weighting factors for the transversal filter; the other for sampling an input signal to the filter. Each sample of the input signal is then multiplied by the appropriate weighting factor obtained from the sampling of the reference signal and all products are summed to obtain a sample of the filter output.
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Citations
9 Claims
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1. A programmable general purpose filter comprising:
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input signal sampler means, having an input terminal and a plurality of output terminals, each output terminal providing a sample of an input signal applied to said input terminal; reference signal sampler means having an input terminal and a plurality of output terminals, the number of output terminals being equal to the number of output terminals contained in said input signal sampler, each output terminal corresponding to one of said output terminals of said input signal sampler and providing a sample of a reference signal applied to said input terminal; a plurality of multipliers equal in number to the number of output terminals of said input signal sampler, each multiplier being coupled to an output terminal of said input signal sampler and to said corresponding output terminal of said reference signal sampler, each of said multipliers having an output terminal at which a signal representative of the multiplication of said input signal sample by said reference signal sample is provided; and summation means coupled to each of said output terminals of said plurality of multipliers for providing a signal representative of the sum of the products of said input signal samples by said reference signal samples, said sum being the sampled output response to said sampled input signal of a programmed filter defined by said sampled reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A signal multiplier comprising
first electronically controlled current means, having an input terminal, an output terminal, and a control terminal; -
second electronically controlled current means, having an input terminal, an output terminal, and a control terminal, said control terminal coupled to said control terminal of said first electronically controlled current means; third electronically controlled current means, having an input terminal, an output terminal, and a control terminal, said input terminal coupled to said input terminal of said first electronically controlled current means; fourth electronically controlled current means, having an input terminal, an output terminal, and a control terminal, said input terminal coupled to said input terminal of said second electronically controlled current means and said control terminal coupled to said control terminal of said third electronically controlled current means; difference amplifier means, having a first input terminal, a second input terminal, and an output terminal, the operation of which provides a signal at said output terminal representative of the difference between the signals at said first and second input terminals; said first input terminal coupled to said output terminals of said first and fourth electronically controlled current means so that the sum of the currents at said output terminals of said second and fourth electronically controlled current means is coupled to said first input terminal, said second input terminal coupled to said output terminals of said second and third electronically controlled current means so that the sum of the currents at said output terminals of said second and fourth electronically controlled current means is coupled to said input terminal, whereby a signal representative of the product of a first signal with a predetermined polarity and a second signal with a predetermined polarity appears at said output terminal when said first signal with said predetermined polarity is applied to said first input terminal of said first and third electronically controlled current means, said first signal with polarity opposite to said predetermined polarity appears at said input terminal of said second and fourth electronically controlled current means, said second signal with said predetermined polarity appears at said control terminals of said first and second electronically controlled current means and said second signal with polarity opposite to said predetermined polarity appears at said control terminals of said third and fourth electronically controlled current means. - View Dependent Claims (9)
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Specification