CN102572643A

CN102572643A - Plosive eliminating circuit

Info

Publication number: CN102572643A
Application number: CN2010106125229A
Authority: CN
Inventors: 欧进崇
Original assignee: Premier Image Technology China Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Premier Image Technology China Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2010-12-29
Filing date: 2010-12-29
Publication date: 2012-07-11
Anticipated expiration: 2030-12-29
Also published as: CN102572643B

Abstract

The invention provides a plosive eliminating circuit, which comprises a control module, a filtering circuit and a switching tube. The control module comprises a sound processing unit and is provided with a signal end connected with the sound processing unit and a control end. The filtering circuit comprises a first resistor, a first capacitor and a second resistor. The first capacitor is connected between the first resistor and the second resistor, the other end of the first resistor is connected with the signal end, and the other end of the second resistor is connected with the ground. The switching tube comprises a first end, a second end and a third end controlling disconnection and connection of the first end and the second end, the firs tend is connected between the first capacitor and the second resistor, and the third end is connected with the control end. The control end controls the switching tube to be connected after powering up and controls the switch tube to be closed before powering down so as to prevent plosive from being output from the second end.

Description

Plosive is eliminated circuit

Technical field

The present invention relates to a kind of circuit engineering, particularly a kind of plosive is eliminated circuit.

Background technology

At present, it is more and more to have a portable type electronic product of audio output function.Yet a lot of portable type electronic products can produce a plosive in switching on and shutting down moments, and reason is that the sound processing unit of portable type electronic product in the moment that powers on or cut off the power supply, can produce a unusual pulse.How eliminate aspect this abnormal pulsers, some is to carry out from the inner aspect of sound processing unit, and some is to carry out from the peripheral circuit aspect of output.But, traditional no matter be positioned at all more complicated of structure that sound processing unit outside or inner plosive eliminate circuit.

Summary of the invention

In view of this, be necessary to provide a kind of plosive simple in structure to eliminate circuit.

A kind of plosive is eliminated circuit, and it comprises a control module, a filter circuit and a switching tube; Said control module comprises a sound processing unit, and this control module has the signal end and the control end that are connected with said sound processing unit; Said filter circuit comprises one first resistance, one first electric capacity and one second resistance; Said first electric capacity is connected between said first resistance and second resistance, and the other end of said first resistance is connected with said signal end, the other end ground connection of said second resistance; Said switching tube comprises the 3rd end of the break-make of one first end, one second end and control first end and second end, and said first end is connected between said first electric capacity and second resistance, and said the 3rd end is connected with said control end.

Plosive provided by the invention is eliminated the circuit control module in the back control switch pipe conducting that powers on, and the control switch pipe is closed before outage, thereby prevents second end output from said switching tube of plosive that said sound processing unit produces.

Description of drawings

Fig. 1 is the circuit diagram that the plosive that provides of first embodiment of the invention is eliminated circuit.

Fig. 2 is the circuit diagram that the plosive that provides of second embodiment of the invention is eliminated circuit.

The main element symbol description

Plosive is eliminated circuit 100,100a

Control module 10

Processor 11

Sound processing unit 111

Signal end 12

Control end 13

Reseting module 14

Chip 141 resets

Filter circuit 20

First resistance R 1

Second resistance R 2

First capacitor C 1

Switching tube 30

The first end D

The second end S

The 3rd end G

The 3rd resistance R 3

The 4th resistance R 4

Second capacitor C 2

The 3rd capacitor C 3

Embodiment

Below will combine accompanying drawing that the present invention is done further detailed description.

As shown in Figure 1; For a kind of plosive that first embodiment of the invention provides is eliminated circuit 100; It comprises a control module 10, a filter circuit 20 and a switching tube 30; Said filter circuit 20 is connected between said control module 10 and the switching tube 30, and said control module 10 is used for the break-make of control switch pipe 30.

Said control module 10 comprises a processor 11, is provided with a sound processing unit 111 in the said processor 11.Said control module 10 has the control end 13 that the signal end 12 and that is connected with said sound processing unit 111 is connected with said processor 11.One digital audio signal is handled the back from said signal end 12 outputs through said sound processing unit 111.

Said filter circuit 20 comprises one first resistance R 1, one first capacitor C 1 and one second resistance R 2.Said first capacitor C 1 is connected between said first resistance R 1 and second resistance R 2, and the other end of said first resistance R 1 is connected with said signal end 12, the other end ground connection of said second resistance R 2.

Said switching tube 30 comprises the 3rd end G of the break-make of one first end D, one second end S and control first an end D and the second end S, and the said first end D is connected between said first capacitor C 1 and second resistance R 2, and said the 3rd end G is connected with said control end 13.In this execution mode, said switching tube 30 is the N-channel MOS pipe, and wherein the first end D is drain electrode, and the second end S is a source electrode, and the 3rd utmost point G is a grid.

In this execution mode, said plosive is eliminated circuit 100 and is also comprised one the 3rd resistance R 3 and one the 4th resistance R 4.One end of said the 3rd resistance R 3 is connected other end ground connection with the second end S of said switching tube 30.One end of said the 4th resistance R 4 is connected other end ground connection with the 3rd end G of said switching tube 30.

In said processor 11 power up, the control end 13 that is connected with said processor 11 keeps low level, and said switching tube 30 is in off-state.The pulse signal that the signal end 12 that said sound processing unit 111 is connected is exported in power up can not be from the second end S output of said switching tube 30.When said processor 11 power on accomplish and postpone a period of time after, from said control end 13 output high level, control said switching tube 30 conductings, from the voice signal of said signal end 12 outputs through the second end S of said switching tube 30 output.In said processor 11 power process,, control said switching tube 30 and break off from said control end 13 first output low levels.The pulse signal that said signal end 12 is produced in power process can not be from said second end S output.

As shown in Figure 2; For a kind of plosive that second embodiment of the invention provides is eliminated circuit 100a; The difference that the plosive that the said plosive elimination circuit 100a and first execution mode provide is eliminated circuit 100 is: said control module 10 also comprises a reseting module 14, and said control end 13 is connected with said reseting module 14.

Said reseting module 14 comprises reset chip 141, one second capacitor C 2 and one the 3rd capacitor C 3.The said chip 141 that resets comprises OUT end, vdd terminal, VSS end and CD end.Said OUT end is connected with said control end 13.Said the 3rd capacitor C 3 is connected between vdd terminal and the VSS end, and said vdd terminal is connected with a power end 112 of said processor 11, said VSS end ground connection.One end of said second capacitor C 2 is connected other end ground connection with said CD end.

In said processor 11 power up, the said chip 141 that resets postpones the output high level after the said pulse signal of said signal end 12 outputs.In said processor 11 power process, said chip 141 output low level before the said pulse signal of said signal end 12 outputs that resets.In this execution mode, capacitance that can be through adjusting second capacitor C 2 is with adjustment reset the OUT end output high level and the low level time point of chip 141.

It is understandable that, for the person of ordinary skill of the art, can make change and the distortion that other various pictures are answered by technical conceive according to the present invention, and all these change the protection range that all should belong to claim of the present invention with distortion.

Claims

1. a plosive is eliminated circuit, and it comprises a control module, a filter circuit and a switching tube; Said control module comprises a sound processing unit, and this control module has the signal end and the control end that are connected with said sound processing unit; Said filter circuit comprises one first resistance, one first electric capacity and one second resistance; Said first electric capacity is connected between said first resistance and second resistance, and the other end of said first resistance is connected with said signal end, the other end ground connection of said second resistance; Said switching tube comprises the 3rd end of the break-make of one first end, one second end and control first end and second end, and said first end is connected between said first electric capacity and second resistance, and said the 3rd end is connected with said control end.

2. plosive as claimed in claim 1 is eliminated circuit, and it is characterized in that: said control module comprises a processor, and it is inner that said sound processing unit is arranged on said processor, and said control end is connected with said processor.

3. plosive as claimed in claim 1 is eliminated circuit, and it is characterized in that: said control module comprises a processor and a reseting module, and it is inner that said sound processing unit is arranged on said processor, and said control end is connected with said reseting module.

4. plosive as claimed in claim 3 is eliminated circuit, it is characterized in that: said reseting module comprises reset chip, one second electric capacity and one the 3rd electric capacity; The said chip that resets comprises OUT end, vdd terminal, VSS end and CD end; Said OUT end is connected with said control end; Said the 3rd electric capacity is connected between vdd terminal and the VSS end, and said vdd terminal is connected with a power end of said processor, said VSS end ground connection; One end of said second electric capacity is connected other end ground connection with said CD end.

5. plosive as claimed in claim 1 is eliminated circuit, it is characterized in that: said plosive is eliminated circuit and is also comprised one the 3rd resistance and one the 4th resistance; One end of said the 3rd resistance is connected other end ground connection with second end of said switching tube; One end of said the 4th resistance is connected other end ground connection with the 3rd end of said switching tube.

6. plosive as claimed in claim 1 is eliminated circuit, and it is characterized in that: said switching tube is the N-channel MOS pipe, and wherein first end is drain electrode, and second end is a source electrode, the 3rd grid very.