Unlock instant, AI-driven research and patent intelligence for your innovation.

Pop-up Noise Reduction In A Device

A device, integrator technology, applied in the field of calibration offset, which can solve problems such as difficult component matching, small size, and operational amplifier voltage offset

Inactive Publication Date: 2012-12-05
ST ERICSSON INDIA PVT +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, op amps often generate voltage offsets due to manufacturing defects
Also, due to the often small size of the components, it is difficult to achieve proper matching between components

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pop-up Noise Reduction In A Device
  • Pop-up Noise Reduction In A Device
  • Pop-up Noise Reduction In A Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The disclosed subject matter relates to schemes for reducing audible pop noise generated from speakers of electronic devices. Examples of electronic devices include cellular telephones, audio / video players, laptops, computing devices, and home entertainment systems. Each of these devices includes an audio subsystem having a speaker and an audio amplifier associated with the speaker. Popping noise can occur during device power-up or unmute for various reasons, including inherent mismatches in the components of the audio amplifier associated with the speaker. In one embodiment, a class D amplifier is used as an audio amplifier for providing amplification of an input audio signal. A class D amplifier as described herein includes an integrator in a feedback configuration, a modulation circuit including one or more comparators, and a driver circuit for driving a load such as a speaker.

[0013] The integrator receives the audio signal provided as input to the audio amplifi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio subsystem (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).

Description

technical field [0001] The present subject matter generally relates to reducing pop noise in a device, and more particularly to calibrating offset in a device. Background technique [0002] Electronic devices such as communication devices and home entertainment devices include audio subsystems for providing audio output. An audio subsystem typically includes an input device for providing audio signals, an audio amplifier for amplifying received audio signals, and one or more speakers for producing amplified sound. Audio amplifiers used to amplify audio signals are generally divided into different classes, including A, B, AB, C, and D. In particular, Class D amplifiers have the advantage of providing high-efficiency audio output with minimal power loss, and are therefore preferred in applications where power efficiency is important, such as in battery-powered and portable applications. [0003] Class D amplifiers are switching amplifiers and generally include an integrator,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03F1/30H03F3/217
CPCH03F1/305H03F3/217H03F1/30
Inventor 安基特·西德赫拉贾·普拉布·J希亚姆·索马亚尤拉·S
Owner ST ERICSSON INDIA PVT