Fixed coefficient high decimation filter
First Claim
Patent Images
1. A digital filter, comprising:
- (a) a decimation filter with a first filter input, a first filter output, and an adjustable decimation rate input, with the decimation rate of said decimation filter dependent upon said decimation rate input and with the gain of said decimation filter dependent upon said decimation rate;
(b) a multiplier with a multiplier input, a multiplicand input, and a product output, said multiplicand input coupled to said first filter output and said multiplier input with the reciprocal of said gain; and
(c) a fixed coefficient filter with second filter input coupled to said product output and with a second filter output.
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Abstract
A digital down converter with a programmable mixing down frequency and a programmable extraction bandwidth uses a ROM based sin/cos generator plus a programmable high decimation filter followed by a gain compensating scaling multiplier and a fixed FIR filter. Output format options are also programmable, and programming commands are serially loaded into registers. Various components may be isolated for efficient testing and also subsystem operation.
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Citations
12 Claims
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1. A digital filter, comprising:
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(a) a decimation filter with a first filter input, a first filter output, and an adjustable decimation rate input, with the decimation rate of said decimation filter dependent upon said decimation rate input and with the gain of said decimation filter dependent upon said decimation rate; (b) a multiplier with a multiplier input, a multiplicand input, and a product output, said multiplicand input coupled to said first filter output and said multiplier input with the reciprocal of said gain; and (c) a fixed coefficient filter with second filter input coupled to said product output and with a second filter output. - View Dependent Claims (2, 3, 4)
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5. A digital filter, comprising:
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a decimation filter with a first filter input, a first filter output, and an adjustable input decimation rate, and with the gain of said decimation filter dependent upon said decimation rate; a multiplier with a multiplier input, a multiplicand input, and a product output, said multiplicand input coupled to said first filter output and said multiplier providing gain compensation; and a fixed coefficient filter with second filter input coupled to said product output and with a second filter output. - View Dependent Claims (6, 7, 8)
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9. A digital filter, comprising:
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a decimation filter with a first filter input, a first filter output, and an adjustable decimation rate input; a multiplier with a multiplier input, a multiplicand input, and a product output, said multiplicand input coupled to said first filter output; and a fixed coefficient filter with second filter input coupled to said product output and with a second filter output. - View Dependent Claims (10, 11, 12)
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Specification