Multi-stage finite impulse response filter processing
First Claim
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1. A method of emulating an n-stage finite impulse response (FIR) filter, the method comprising:
- connecting an output of a one-stage finite impulse response (FIR) filter to an input of the one-stage FIR filter to form a feedback path; and
configuring the one-stage FIR filter to send a feedback signal along the feedback path, the feedback signal corresponding to an output data signal from at least one of a first stage of the n-stage FIR filter through an n−
1 stage of the n-stage FIR filter.
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Abstract
In one aspect, the invention is a method of emulating an n-stage finite impulse response (FIR) filter. The method includes connecting an output of a one-stage FIR filter to an input of the one-stage FIR filter to form a feedback path. The method also includes configuring the one-stage FIR filter to send a feedback signal along the feedback path. The feedback signal corresponds to an output data signal from at least one of a first stage of the n-stage FIR filter through an n−1 stage of the n-stage FIR filter.
51 Citations
27 Claims
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1. A method of emulating an n-stage finite impulse response (FIR) filter, the method comprising:
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connecting an output of a one-stage finite impulse response (FIR) filter to an input of the one-stage FIR filter to form a feedback path; and
configuring the one-stage FIR filter to send a feedback signal along the feedback path, the feedback signal corresponding to an output data signal from at least one of a first stage of the n-stage FIR filter through an n−
1 stage of the n-stage FIR filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An article comprising a machine-readable medium that stores executable instructions for emulating an n-stage finite impulse response (FIR) filter, the instructions causing a machine to:
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connect an output of a one-stage finite impulse response (FIR) filter to an input of the one-stage FIR filter to form a feedback path; and
configure the one-stage FIR filter to send a feedback signal along the feedback path, the feedback signal corresponding to an output data signal from at least one of a first stage of the n-stage FIR filter through an n−
1 stage of the n-stage FIR filter. - View Dependent Claims (13, 14, 15)
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16. An apparatus comprising:
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a memory that stores executable instructions for emulating an n-stage finite impulse response (FIR) filter; and
a processor that executes the instructions to;
connect an output of a one-stage finite impulse response (FIR) filter to an input of the one-stage FIR filter to form a feedback path; and
configure the one-stage FIR filter to send a feedback signal along the feedback path, the feedback signal corresponding to an output data signal from at least one of a first stage of the n-stage FIR filter through an n−
1 stage of the n-stage FIR filter. - View Dependent Claims (17, 18, 19)
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20. A finite impulse response (FIR) filter having an input and an output, the FIR filter comprising:
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a sample memory configured to receive sample data from the input of the FIR filter and feedback data;
an adder coupled to receive data from the sample memory;
a coefficient memory, configured to store FIR filter coefficient values, each of the FIR filter coefficient values corresponding to filter coefficient values for a particular stage of an n-stage FIR filter;
a multiplier configured to receive the sample data from the adder and the FIR filter coefficient values from the coefficient memory and to combine the sample data and the FIR filter coefficient values to generate a product signal;
an accumulator adapted to receive the product signal from the multiplier at an input thereof and to provide a FIR filter stage output signal corresponding to at least one of n stages of the n-stage FIR filter at an output thereof; and
a feedback signal path coupled between the output of the accumulator and the input of the sample memory and configured to provide the feedback data. - View Dependent Claims (21, 22, 23)
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24. A receiver in a side object detection system disposed in a vehicle, the receiver comprising:
an analog-to-digital converter comprising a finite impulse response (FIR) filter, the FIR comprising;
a sample memory configured to receive sample data from an input of the FIR filter and feedback data;
an adder coupled to receive data from the sample memory;
a coefficient memory configured to store FIR filter coefficient values, each of the FIR filter coefficient values corresponding to filter coefficient values for a particular stage of an n-stage FIR filter;
a multiplier configured to receive the sample data from the adder and the FIR filter coefficient values from the coefficient memory and to combine the sample data and the FIR filter coefficient values provided thereto to provide a product signal;
an accumulator configured to receive the product signal from the multiplier circuit at an input thereof and to provide a FIR filter stage output signal corresponding to at least one of n stages of the n-stage FIR filter at an output thereof; and
a feedback signal path coupled between the output of the accumulator and the input of the sample memory and configured to provide the feedback data. - View Dependent Claims (25, 26, 27)
Specification