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1. US20210409004 - LOW POWER BIQUAD SYSTEMS AND METHODS

Office
United States of America
Application Number 16917694
Application Date 30.06.2020
Publication Number 20210409004
Publication Date 30.12.2021
Publication Kind A1
IPC
H03H 17/02
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
02Frequency-selective networks
CPC
H03H 17/0248
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
02Frequency selective networks
0248Filters characterised by a particular frequency response or filtering method
Applicants Google LLC
Inventors Jens Kristian Poulsen
Title
(EN) LOW POWER BIQUAD SYSTEMS AND METHODS
Abstract
(EN)

Biquad stage systems and methods include receiving at biquad sections a signal sample, generating, by each biquad section, a pair of output values based on the signal sample, including a first value based on fixed-point processing path and a second value emulating a floating-point processing path, and accumulating the pair of output values from each of the plurality of biquad sections to generate an output signal. The biquad stage receives an N-bit input signal, which is processed by a biquad section. Delay elements delay the signal sample before input to other biquad sections. The delayed signal sample is input to the first processing path and the second processing path of a corresponding biquad stage. By performing the processing based on two paths, a more accurate result can be found when using a reduced word length in the multiply operations resulting in a lowering of the power consumption.


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