Signa-delta modulation with offset
First Claim
1. An apparatus comprising:
- a summer configured to add an offset to input samples to generate intermediate samples; and
a sigma-delta modulator configured to perform noise shaping on the intermediate samples and provide output samples.
1 Assignment
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Accused Products
Abstract
Techniques for performing ΣΔ modulation with offset in order to reduce out-of-band quantization noise are described. In an exemplary oversampling DAC that implements ΣΔ modulation with offset, an interpolation filter performs upsampling and interpolation filtering on data samples to generate input samples. A summer adds an offset to the input samples to generate intermediate samples. The offset alters the characteristics of the quantization noise from a ΣΔ modulator and may be selected to obtain the desired quantization noise characteristics, to retain as much dynamic range as possible, and to simplify the removal of the offset. The ΣΔ modulator performs upsampling and noise shaping on the intermediate samples and provides output samples. An offset removal unit removes at least a portion of the offset from the output samples in the digital or analog domain. A DAC converts the output samples to analog.
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Citations
26 Claims
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1. An apparatus comprising:
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a summer configured to add an offset to input samples to generate intermediate samples; and a sigma-delta modulator configured to perform noise shaping on the intermediate samples and provide output samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An integrated circuit comprising:
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a summer configured to add an offset to input samples to generate intermediate samples; and a sigma-delta modulator configured to perform noise shaping on the intermediate samples and provide output samples. - View Dependent Claims (17, 18)
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19. A method comprising:
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adding an offset to input samples to generate intermediate samples; and performing noise shaping on the intermediate samples to generate output samples. - View Dependent Claims (20, 21, 22)
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23. An apparatus comprising:
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means for adding an offset to input samples to generate intermediate samples; and means for performing noise shaping on the intermediate samples to generate output samples. - View Dependent Claims (24, 25, 26)
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Specification