TWI428027B - Image capturing device - Google Patents

Image capturing device Download PDF

Info

Publication number
TWI428027B
TWI428027B TW98141278A TW98141278A TWI428027B TW I428027 B TWI428027 B TW I428027B TW 98141278 A TW98141278 A TW 98141278A TW 98141278 A TW98141278 A TW 98141278A TW I428027 B TWI428027 B TW I428027B
Authority
TW
Taiwan
Prior art keywords
electronic
control
electronic switch
circuit
pop
Prior art date
Application number
TW98141278A
Other languages
Chinese (zh)
Other versions
TW201121340A (en
Inventor
Chin Chung Wang
Ching Liang Wang
Original Assignee
Hon Hai Prec Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hon Hai Prec Ind Co Ltd filed Critical Hon Hai Prec Ind Co Ltd
Priority to TW98141278A priority Critical patent/TWI428027B/en
Publication of TW201121340A publication Critical patent/TW201121340A/en
Application granted granted Critical
Publication of TWI428027B publication Critical patent/TWI428027B/en

Links

Description

Popping elimination circuit

The present invention relates to a pop-up cancellation circuit.

Today's audio playback devices, especially portable devices such as mobile phones and MP3 players, often have the problem of popping sounds at the moment of power on/off. The main reason is that the moment of switching on and off, the surge occurs due to voltage jumps. Voltage shock audio player.

However, most of today's pop-up cancellation circuits use integrated chips for pop-up cancellation, such as the MAX9890. Such integrated chips are relatively expensive and greatly increase the cost of the pop-up cancellation circuit.

In view of this, it is necessary to provide a low-cost pop-up cancellation circuit.

A pop-up cancellation circuit for canceling pops for an electronic device. The audio playback circuit includes a digital processor, an audio player, and a coupling capacitor coupled between the digital processor and the audio player. The digital processor is configured to output an audio signal. The coupling capacitor is used to couple the audio signal output by the digital processor to the audio player. The audio player is configured to convert an audio signal into an audio signal. The pop-up cancellation circuit further includes a controller and an initialization circuit. Said The controller includes a control end and an output end. The control terminal is coupled to the digital processor. The output terminal is configured to output a first control level when the electronic device is turned on or off, and a trip voltage is generated on the line between the coupling capacitor and the audio player. The initialization circuit includes a first electronic switch, and the first electronic switch includes a first control end, a first electronic end, and a second electronic end. The first control end is configured to control conduction and disconnection between the first electronic end and the second electronic end. A first control end of the first electronic switch is coupled to an output of the controller. A first electronic end of the first electronic switch is coupled to an input of the audio player. The second electronic end of the first electronic switch is grounded. The first control end of the first electronic switch controls the first electronic switch to be turned on when receiving the first control level. A voltage on a line between the coupling capacitor and the audio player is conducted to a first electronic end and a second electronic end of the first electronic switch to eliminate a popping phenomenon.

Compared with the prior art, the pop-up canceling circuit can eliminate the voltage on the line between the coupling capacitor and the audio player when the electronic device is just turned on or normally turned off or abnormally powered off by the initialization circuit. The popping sound produced by the jump. This eliminates the need for integrated wafers for pop-up cancellation and reduces the cost of pop-up cancellation circuitry.

100‧‧‧Phenomenon cancellation circuit

10‧‧‧Audio playback circuit

11‧‧‧Digital Processor

12‧‧‧Audio player

C‧‧‧Coupling capacitor

15‧‧‧ Controller

150‧‧‧Control terminal

151‧‧‧ Output

20‧‧‧Initialization circuit

R1‧‧‧first resistance

Q1‧‧‧First electronic switch

30‧‧‧Protection circuit

31‧‧‧Battery

Q2‧‧‧Second electronic switch

32‧‧‧Reset circuit

R2‧‧‧second resistance

1 is a circuit diagram of a pop-up cancel circuit provided by a preferred embodiment of the present invention.

The invention will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a pop-up cancellation circuit 100 according to a preferred embodiment of the present invention, which can be used in some electronic devices such as mobile phones, MP4s, and digital cameras. In this embodiment The electronic device is a digital camera (not shown). The pop-up cancellation circuit 100 is connected to the audio playback circuit 10 of the digital camera for eliminating the popping phenomenon when the digital camera is turned on and off. The pop-up cancellation circuit 100 includes a controller 15, an initialization circuit 20, and a protection circuit 30.

The audio playback circuit 10 includes a digital processor 11, an audio player 12, and a coupling capacitor C coupled between the digital processor 11 and the audio player 12. The digital processor 11 is configured to output an audio signal. The coupling capacitor C is used to couple the audio signal output by the digital processor 11 to the audio player 12. The audio player 12 is configured to convert an audio signal into an audio signal.

The controller 15 includes a control terminal 150 and an output terminal 151. The control terminal 150 is connected to the digital processor 11. The output terminal 151 is configured to output a first control level to the initialization circuit 20. In this embodiment, the first control level is a high level. It can be understood that the controller 15 and the digital processor 11 can be two independent components, and the controller 15 can be directly integrated on the digital processor 11, and is not limited to the embodiment. In the present embodiment, the controller 15 employs a central processing unit in a digital camera.

The initialization circuit 20 includes a first resistor R1 and a first electronic switch Q1. The first electronic switch Q1 includes a first control end, a first electronic end, and a second electronic end. The first control end is configured to control conduction and disconnection between the first electronic end and the second electronic end. In this embodiment, the first electronic switch Q1 is an NPN-type triode, and the base B, the collector C and the emitter E of the triode constitute a first control end and a first electronic end of the first electronic switch Q1, respectively. And a second electronic end. a first control end of the first electronic switch Q1 is connected to the controller 15 through the first resistor R1 The output end 151, the first electronic end of the first electronic switch Q1 is connected to the input end of the audio player 12. The second electronic end of the first electronic switch Q1 is grounded.

The protection circuit 30 includes a battery 31, a second electronic switch Q2, a reset circuit 32, and a second resistor R2. In this embodiment, the battery 31 is a clock battery in the digital camera. The second electronic switch Q2 includes a second control end, a third electronic end, and a fourth electronic end. The second control terminal is configured to control conduction and disconnection between the third electronic terminal and the fourth electronic terminal. In this embodiment, the second electronic switch Q2 is a PNP type triode, and the base B, the collector C and the emitter E of the triode constitute a second control end and a third electronic end of the second electronic switch Q2, respectively. And the fourth electronic end. The second control end of the second electronic switch Q2 is connected to the output end of the reset circuit 32 through the second resistor R2, and the third electronic end of the second electronic switch Q2 is connected to the controller 15 Output 151. The fourth electronic end of the second electronic switch Q2 is connected to the output end of the clock battery 31. The reset circuit 32 is for outputting a second control level. In this embodiment, the reset circuit 32 is a reset chip in the digital camera, and the second control level output by the reset circuit 32 is a low level.

When the digital camera integrated with the pop-up cancel circuit 100 is turned on, the controller 15 turns on the digital processor 11 to output an audio signal for a period of time, such as 10 milliseconds, and the output end 151 of the controller 15 outputs a first control. Leveling to the first control terminal of the first electronic switch Q1, the first control level causes the first electronic switch Q1 to be turned on. A trip voltage generated on the line between the coupling capacitor C and the audio player 12 due to the digital camera just turned on is conducted to the ground via the first electronic switch Q1. To eliminate the popping sound that is generated when you turn it on. When the controller 15 turns on the digital processor 11 to emit an audio signal for a period of time, such as 10 milliseconds, the output 151 of the controller 15 stops transmitting. At the first control level, the first electronic switch Q1 is turned off. The audio signal output by the digital processor 11 is coupled to the audio player 12 for playback via a coupling capacitor C.

When the digital camera is turned off, the controller 15 turns off the digital processor 11 to output the audio signal for a period of time, such as 10 milliseconds, and the output end 151 of the controller 15 outputs the first control level. A control level causes the first electronic switch Q1 to conduct. The trip voltage generated on the line between the coupling capacitor C and the audio player 12 due to the digital camera just turned off is conducted to the ground via the first electronic switch Q1 to eliminate the popping sound generated when the electronic device is turned off.

When the digital camera is abnormally powered off, one of the output pins of the reset circuit 32 outputs a second control level to the second control terminal of the second electronic switch Q2, and the second electronic switch Q2 is turned on, and the clock battery 31 is turned on. The output high-level second electronic switch Q2 flows to the first control end of the first electronic switch Q1, causing the first electronic switch Q1 to be turned on. Since the digital processor 11 just stops outputting the audio signal, the popping sound generated by the voltage between the coupling capacitor C and the audio player 12 due to the jump is turned on to the ground via the first electronic switch O1 to eliminate A popping sound generated when an electronic device is abnormally powered off.

The pop-up canceling circuit can eliminate the popping sound generated by the voltage on the line between the coupling capacitor and the audio player due to the jump when the electronic device is turned on or normally turned off by the initialization circuit. The protection circuit can also be used to eliminate the abnormal power-off of the electronic device. When the digital processor just stops outputting the audio signal, the voltage on the line between the coupling capacitor and the audio player is generated due to the jump. Sonic boom. The cost of the pop-up cancellation circuit design is reduced because there is no need to use an integrated chip for pop-up cancellation.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Phenomenon cancellation circuit

10‧‧‧Audio playback circuit

11‧‧‧Digital Processor

12‧‧‧Audio player

C‧‧‧Coupling capacitor

15‧‧‧ Controller

150‧‧‧Control terminal

151‧‧‧ Output

20‧‧‧Initialization circuit

R1‧‧‧first resistance

Q1‧‧‧First electronic switch

30‧‧‧Protection circuit

31‧‧‧Battery

Q2‧‧‧Second electronic switch

32‧‧‧Reset circuit

R2‧‧‧second resistance

Claims (8)

  1. A pop-up canceling circuit for canceling popping sound for an electronic device, the pop-up canceling circuit comprising an audio playing circuit, the audio playing circuit comprising a digital processor, an audio player and a digital processor coupled thereto a coupling capacitor with an audio player for outputting an audio signal, the coupling capacitor for coupling an audio signal output by the digital processor to an audio player, the audio player for using an audio signal Converting into audio signal playback, the improvement is as follows: further comprising a controller, an initialization circuit, the controller includes a control end and an output end, the control end is connected to the digital processor, and the output end is used Outputting a first control level when the electronic device is turned on or off, generating a trip voltage on the line between the coupling capacitor and the audio player, the initialization circuit including a first electronic switch, the first The electronic switch includes a first control end, a first electronic end, and a second electronic end, wherein the first control end is configured to control the first electronic end and the first Conducting and disconnecting between the electronic terminals, the first control end of the first electronic switch is connected to the output end of the controller, and the first electronic end of the first electronic switch is connected to the audio player Input, the second electronic end of the first electronic switch is grounded, and the first control end of the first electronic switch controls the first electronic switch to be turned on when receiving the first control level, the coupling A voltage on a line between the capacitor and the audio player is conducted to a ground via a first electronic end and a second electronic end of the first electronic switch to eliminate a popping phenomenon, the pop-up eliminating circuit further comprising a protection circuit The protection circuit includes a battery, a second electronic switch, and a reset circuit, and the second electronic switch includes a second control end, a third electronic end, and a fourth electronic The second control terminal is configured to control conduction and disconnection between the third electronic terminal and the fourth electronic terminal, and the second control terminal of the second electronic switch is connected to an output end of the reset circuit. a third electronic end of the second electronic switch is connected between the first output end of the controller and a first control end of the first electronic switch, and a fourth electronic end of the second electronic switch is connected to the The output end of the clock battery, when the electronic device is abnormally powered off, the reset circuit outputs a second control level to the second control end of the second electronic switch, the second electronic switch is turned on, and the battery outputs high power Passing the second electronic switch to the first control end of the first electronic switch, causing the first electronic switch to be turned on, and the voltage between the coupling capacitor and the audio player is conducted to the ground via the first electronic switch, To eliminate the popping phenomenon.
  2. The pop-up canceling circuit of claim 1, wherein: the first electronic switch is an NPN-type triode, and the base, the collector and the emitter of the triode constitute a first control of the first electronic switch, respectively. The end, the first electronic end and the second electronic end.
  3. The pop-up canceling circuit of claim 1, wherein the first control level is a high level.
  4. The pop-up canceling circuit of claim 1, wherein: the initializing circuit further comprises a first resistor, the first resistor is connected to the first control end of the first switching tube and the Between the first output of the controller.
  5. The pop-up canceling circuit of claim 1, wherein: the second electronic switch is a PNP-type triode, and the base, the collector and the emitter of the triode constitute a second control of the second electronic switch, respectively. The end, the third electronic end and the fourth electronic end.
  6. The pop-up canceling circuit according to claim 1, wherein: the second control The level is low.
  7. The pop-up canceling circuit of claim 1, wherein: the battery is a clock battery in the electronic device, and the reset circuit is a reset chip in the electronic device.
  8. The pop-up canceling circuit of claim 1, wherein: the protection circuit further comprises a second resistor, and the second control end of the second electronic switch is connected to the reset circuit through the second resistor The output.
TW98141278A 2009-12-03 2009-12-03 Image capturing device TWI428027B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW98141278A TWI428027B (en) 2009-12-03 2009-12-03 Image capturing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW98141278A TWI428027B (en) 2009-12-03 2009-12-03 Image capturing device

Publications (2)

Publication Number Publication Date
TW201121340A TW201121340A (en) 2011-06-16
TWI428027B true TWI428027B (en) 2014-02-21

Family

ID=45045533

Family Applications (1)

Application Number Title Priority Date Filing Date
TW98141278A TWI428027B (en) 2009-12-03 2009-12-03 Image capturing device

Country Status (1)

Country Link
TW (1) TWI428027B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108076417A (en) * 2016-11-18 2018-05-25 扬智科技股份有限公司 Output-stage circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200806068A (en) * 2006-07-05 2008-01-16 Asustek Comp Inc Anti-pop circuit
TWM339175U (en) * 2007-11-26 2008-08-21 Universal Scient Ind Co Ltd Cracking noise elimination circuit
TWM361837U (en) * 2008-10-31 2009-07-21 Cybertan Technology Inc Mute device capable of eliminating sonic boom
US20090208032A1 (en) * 2008-02-15 2009-08-20 Hon Hai Precision Industry Co., Ltd. Pop noise suppression apparatus and audio output system utilizing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200806068A (en) * 2006-07-05 2008-01-16 Asustek Comp Inc Anti-pop circuit
TWM339175U (en) * 2007-11-26 2008-08-21 Universal Scient Ind Co Ltd Cracking noise elimination circuit
US20090208032A1 (en) * 2008-02-15 2009-08-20 Hon Hai Precision Industry Co., Ltd. Pop noise suppression apparatus and audio output system utilizing the same
TWM361837U (en) * 2008-10-31 2009-07-21 Cybertan Technology Inc Mute device capable of eliminating sonic boom

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108076417A (en) * 2016-11-18 2018-05-25 扬智科技股份有限公司 Output-stage circuit
CN108076417B (en) * 2016-11-18 2020-09-01 扬智科技股份有限公司 Output stage circuit

Also Published As

Publication number Publication date
TW201121340A (en) 2011-06-16

Similar Documents

Publication Publication Date Title
US9167325B2 (en) Electronic devices with environmental sensors
KR102156452B1 (en) Method and device for reducing radio frequency interference of proximity and touch detection in mobile devices
US10181742B2 (en) Electronic device, charger within the electronic device, and detecting method for detecting abnormal status of connector of electronic device
US7917782B2 (en) Computer device having display device capable of being automatically turned off or turned on according to switch motion of host
KR100941044B1 (en) Overvoltage protection circuit and electronic device
KR101141268B1 (en) Apparatus and method for enabling digital and analog data communication over a data bus
KR102133087B1 (en) Method and device for capacitive near-field communication in mobile device
KR101190684B1 (en) A system and method for reducing standby power consumption
US8801443B2 (en) Audio jack with ESD protection
US20130101132A1 (en) Method and Device for Earphone and USB to Share Micro-USB Interface
KR20040065469A (en) Ear-microphone connection apparatus by using a interface connector of portable phone
EP2937901B1 (en) Electrostatic discharge protection circuit
KR101640465B1 (en) Method and apparatus for recognizing an accessory of a portable terminal
US8552691B2 (en) Charging circuit with function of avoiding battery pulling down voltage output from charging device and charging method thereof
KR101519316B1 (en) Audio interface self-adaptation device
CN106201124A (en) Close to the method and apparatus of the accuracy with the improvement touching detection in mobile device
JP2013187900A (en) Earphone jack drive circuit
TW200424910A (en) Interface device for automatically determining peripherals and electronic device having such a function
CA2599068C (en) Power line communications interface and surge protector
US7685448B2 (en) Computer system sleep/awake circuit
TW200507239A (en) ESD protection circuit having control circuit
JP3742474B2 (en) Computer system having an audio device
US20130279713A1 (en) Method and electronic device for determining headset line sequence
CN102790373B (en) Current foldback circuit and there is the electronic installation of this current foldback circuit
JP2009201097A (en) Crystal oscillator for surface mounting

Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees