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US 5,548,286 AGranted
Analogue and digital convertors using pulse edge modulators with non-linearity error correction
AssigneeB & W Loudspeakers Limited
InventorPeter G. Craven
Life of this patent
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Abstract
A signal convertor comprising a pulse modulator, and a modifier for modifying the signal input thereto in dependence upon the error in previous values of the output thereof, to reduce the effects of said error within a desired signal band.
Claims14
A signal convertor comprising:
- a pulse edge modulator having an input and providing an output, and means, responsive to any error in previous values of said modulator output, for modifying said input to said pulse edge modulator thereby reducing effects of said any error within a desired signal band.
A signal converter comprising:
- a pulse edge modulator controlled by an output of a quantizer, the quantizer having a processed input, said input processed in dependence upon said quantizer output, by a non-linear stage for reducing effects of any non-linearity due to the pulse edge modulator over a predetermined signal frequency band.
A signal converter comprising:
- a signal input,
- a quantizer,
- a feedback network around said quantizer for reducing quantizer noise in a desired frequency band relative to a spectrum of said quantizer which would be exhibited without said feedback network, and
- a pulse modulator, responsive to an output of said quantizer, for providing output of predetermined amplitude pulses, where times of occurrence of edges of said pulses are controlled, by including means for reducing the noise within said desired band by said pulse modulator.
1 more element
A signal convertor including:
- a pulse edge modulator, and
- digital memory means for storing data related to distortion present in an output of said modulator in response to varying input signal levels.
A signal converter which includes:
- a pulse modulator producing pulses having edges, temporal positions of said edges are controlled in dependence upon a value of a digital input to the converter, look-up table means storing a plurality of correction values, said look-up table being addressed in dependence upon a digital input, and means for differentially delaying one of said digital input and an output of said look-up table means, said look-up table means output combined with each digital input to reduce any error generated by the pulse modulator in response to said digital input.
A signal converter which includes:
- a pulse modulator producing pulses having edges, temporal positions of said edges are controlled in dependence upon a value of a digital input to the converter,
- look-up table means storing a plurality of correction values, said look-up table being addressed in dependence upon a digital input, and
- means for differentially delaying one of said digital input and an output of said look-up table means, said look-up table means output is connected to said pulse modulator to reduce any error generated by the pulse modulator in response to said digital input.
Dependencies are inferred from the claim text.