Patent · US Active

Pop-up noise reduction in a device

US9025791B2 · kind B2 · utility

1Cited by

5References

19Claims

0Family size

Assignee

ST-ERICSSON SA · CH

Inventors

Ankit Seedher · Kanchinakote, IN
Raja J. Prabhu · Bengaluru, IN
Shyam Somayajula · Bengaluru, IN

Key dates

Filing date	Nov 30, 2009
Grant date	May 5, 2015
Priority date	—
Expiry date	Mar 31, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH03F1/305
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio sub-system (100) having an integrator (112) for amplifying an input signal (133) and a modulation circuit (114) including one or more comparators. The audio subsystem (100) is further provided with a feedback loop (142) across the integrator (112) and the modulation circuit (114) to calibrate an offsets outputs of the integrator (112) and the modulation circuit (114). The feedback loop (142) includes an integrator-offset loop (202) across the integrator (112) to calibrate an offset (136) in the output of the integrator (112), and an offset calibration loop (302) across the modulation circuit (114) to calibrate an offset (140) in the output of the modulation circuit (114).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.