Apparatus for inhibiting transient noise of audio power amplifier

A technology of audio power and transient noise, applied in the parts of amplifying devices, amplifiers, and improving amplifiers to reduce temperature/power supply voltage changes, etc. , the effect of reducing the voltage swing amplitude

Active Publication Date: 2008-11-19
SPREADTRUM COMM (SHANGHAI) CO LTD
View PDF0 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if you want not to consume power in standby mode, but also want the circuit to respond quickly

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
  • Apparatus for inhibiting transient noise of audio power amplifier
  • Apparatus for inhibiting transient noise of audio power amplifier
  • Apparatus for inhibiting transient noise of audio power amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] image 3 The principle block of the device for suppressing transient noise of audio power amplifier of the present invention is shown. See image 3 , the audio power amplifier 101 has a first input terminal for receiving an input audio signal Vin, a second input terminal for receiving a power supply voltage VCC, a third input terminal for receiving a standby signal, and an output for providing an output audio signal terminal, and the output terminal is connected to the speaker module 111 through the pad 33 . The speaker module 111 is composed of a DC blocking capacitor Cout and a speaker 110 , wherein one end of the speaker 110 is grounded.

[0048] The noise suppression control signal generating module 37 includes a first input terminal pwrdn receiving a standby enabling signal for generating a standby signal, a second input terminal receivin...

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

The invention discloses a device which can restrain the transient noise of an audio power amplifier and can reduce or eliminate the click noise generated in the loudspeaker when the audio power amplifier is switched on or off, or enters or exits the standby mode. The technique proposal of the invention is that the device includes a noise restraining control signal generation module and a noise restraining module. In the noise restraining control signal generation module, a first input terminal receives standby mode enable signal; a second input terminal receives the power supply voltage; a first output terminal is connected with the output of the audio power amplifier and outputs the standby signal to the output of the audio power amplifier; a second output terminal outputs time sequence control signal. In the noise restraining module, the input of the module is connected with the second output terminal of the noise restraining control signal generation module to receive the time sequence control signal; a first output terminal is connected between the audio power amplifier and a blocking capacitor; a second output terminal is connected between the loudspeaker and the blocking capacitor to restrain the transient noise in the loudspeaker, which is generated by the audio transient signal output from the audio power amplifier. The device of the invention can be applied in the audio playing field.

Description

technical field [0001] The present invention relates to an audio frequency amplifying device, in particular to a device for suppressing transient noise generated by an audio frequency power amplifying device. Background technique [0002] Audio transients during the turn-on or turn-off of a single-supply audio power amplifier used to drive speakers (headphones or horns) can produce "clicks" or other strange transient noises in the speaker. As people's expectations of product performance increase, the absence of transient noise has become an important criterion for people to choose products, and thus is a key selling point of portable audio equipment. [0003] Generally, the power-on and power-off process of audio equipment will not be repeated. However, in portable applications, reducing power consumption is the key to extending battery life. When certain functional modules are not required to work, these modules are generally disabled. It's possible that features could fur...

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): H03F1/30H03F1/00
Inventor 张洵傅志军
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap