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US 11,323,130 B2Granted
Infinite impulse response filters with dithering and methods of operation thereof
AssigneeSTMicroelectronics S.r.l.
InventorRyo Tsutsui
Life of this patent
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Abstract
A method of filtering includes generating a random value by a random number generator circuit, filtering a first signal by a first filter to form a filtered first signal, dithering the filtered first signal using the random value to form a dithered first signal, filtering a second signal by a second filter to form a filtered second signal, and dithering the filtered second signal using the random value to form a dithered second signal.
Claims20
A method of filtering comprising:
- generating a random value by a random number generator circuit;
- filtering a first signal by a first filter to form a filtered first signal;
- dithering the filtered first signal using the random value to form a dithered first signal;
- filtering a second signal by a second filter to form a filtered second signal;
- and
- dithering the filtered second signal using the same random value to form a dithered second signal.
3 more elements
A multichannel infinite impulse response (IIR) filter comprising:
- a plurality of channels comprising a first channel and a second channel;
- and
- a random number generator circuit comprising a first output coupled to a first filter of the first channel and a second output coupled to a second filter of the second channel, the random number generator circuit configured to generate a same random value at both the first output and the second output.
A method of multistage filtering comprising:
- generating a random value by a random number generator circuit;
- filtering a first signal using a first filter stage to form a filtered first signal;
- dithering the filtered first signal using the random value to form a dithered first signal;
- filtering the dithered first signal using a second filter stage to form a filtered second signal;
- and
- dithering the filtered second signal using the same random value to form a dithered second signal.
3 more elements
Dependencies are inferred from the claim text.