Pattern biasing for look-ahead delta sigma modulators
First Claim
1. A signal processing system comprising:
- a pattern biasing look-ahead delta sigma modulator, the pattern biasing look-ahead delta sigma modulator comprising;
a quantizer to determine a quantization output value from a selected output candidate vector, wherein the output candidate vector is selected from a set of output candidate vectors and at least one member of the set of output candidate vectors is biased to alter a probability of the biased output candidate vectors being selected by the quantizer.
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Abstract
Look-ahead delta sigma modulators of a signal processing system can selectively bias one or more output candidate vectors to alter the probability of selecting a biased output candidate vector(s) for determination of a quantization output value. The probability, within a range of error, of certain output candidate vectors being selected by a quantizer of the look-ahead delta sigma modulator can be determined. The output candidate vectors determine the quantization output values. Thus, altering the probability of selecting a certain output candidate(s) alters the probability of occurrence of a certain quantization output value(s). Detection of the altered probability allows an output signal to be identified. Identifying an output signal allows for many interesting operations including identifying a specific signal processing system source of the output signal and modifying processing of the output signal. Additionally, some quantization output values can be compressed more densely than others.
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Citations
24 Claims
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1. A signal processing system comprising:
a pattern biasing look-ahead delta sigma modulator, the pattern biasing look-ahead delta sigma modulator comprising; a quantizer to determine a quantization output value from a selected output candidate vector, wherein the output candidate vector is selected from a set of output candidate vectors and at least one member of the set of output candidate vectors is biased to alter a probability of the biased output candidate vectors being selected by the quantizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of processing an input signal with a look-ahead delta sigma modulator using at least one biased output candidate vector, wherein the look-ahead delta sigma modulator has a look-ahead depth greater than or equal to 2, the method comprising:
biasing at least one output candidate vector with a bias factor that alters a probability of each biased output candidate vector being selected by a quantizer to generate quantization output data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A signal processing system comprising:
a detector to receive a first signal and to detect an outcome probability of prescribed bit patterns, wherein the outcome probability of the prescribed bit patterns is determined by biasing prescribed output candidate patterns used by a look-ahead delta sigma modulator to generate a second signal from which the first signal is derived. - View Dependent Claims (23)
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24. An apparatus to process an input signal, the apparatus comprising:
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means for biasing at least one output candidate vector with a bias factor that alters a probability of each biased output candidate vector being selected by a quantizer to generate quantization output data, wherein each output candidate vector includes a potential current output value and at least one future quantization output value; and means for quantizing the input signal using a set of output candidate vectors that includes the biased output candidate vector.
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Specification