CN2845358Y - Sound controlling circuit and TV set therewith - Google Patents
Sound controlling circuit and TV set therewith Download PDFInfo
- Publication number
- CN2845358Y CN2845358Y CN 200520125564 CN200520125564U CN2845358Y CN 2845358 Y CN2845358 Y CN 2845358Y CN 200520125564 CN200520125564 CN 200520125564 CN 200520125564 U CN200520125564 U CN 200520125564U CN 2845358 Y CN2845358 Y CN 2845358Y
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- power amplifier
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- Control Of Amplification And Gain Control (AREA)
Abstract
The utility model discloses a sound controlling circuit and TV set therewith, which includes a CPU and a power amplifying block. A 3.3 V pulse signal output by the CPU generates a 5 V reverse-phase pulse signal after the treatment of the reverse-phase amplifying circuit composed of a triode, a pull-up resistor and a direct current power supply of +5 V, generates a sound controlling voltage within the range of 0V to 5V via integration circuit composed of a resistor and a capacitance according to different duty ratios of the pulse, and is connected to the volume control pin of the power amplifying block; as a consequence, the available accommodation of the output sound volume of the TV set is realized. The sound controlling circuit of the utility model has simple structure, low cost and realizes the conversion from the 3.3V pulse voltage output by the CPU to the voltage of 0V to 5V, which satisfies the demand of the volume control pin of the power amplifying block on the input voltage range as a consequence; on the premise of not using a sound effect processing chip, the utility model realizes the available accommodation of the sound volume of the TV set.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of improvement of television audio control circuit.
Background technology
At present, in the CRT of digital high-definition series model tv product, the sound accompaniment control circuit generally all is to adopt CPU to realize adjusting to the loud speaker output volume by iic bus control audio process chip.Why increase the audio process chip, be because the impulse wave of common its output of CPU is generally 3.3V, realize that the volume control pin of the power amplifier piece that volume is regulated then needs to import the d. c. voltage signal of 0V～5V, this just need increase level shifting circuit between CPU and power amplifier piece, to satisfy the input requirement of power amplifier piece.Described audio process chip connects CPU by iic bus, receives the command signal that CPU sends, and not only can export the required dc level signal of volume control pin that satisfies the power amplifier piece, but also can realize left and right acoustic channels balance and other audio processing capacities.But, for some present low-grade television sets, because its needs realize that simple volume adjusting function gets final product, so if still adopt the sort circuit syndeton to realize the control of volume, will cause the rising of equipment cost, thereby reduce the competitiveness of tv product on market.And for the audio process chip that can realize multiple processing capacity, this also is a kind of waste of resource undoubtedly.Therefore, how designing a level shifting circuit and satisfy level conversion requirement between CPU and the power amplifier piece, thereby avoid the use of audio process chip, is main goal of the invention of the present utility model with the cost that reduces equipment.
Summary of the invention
The utility model is in order to solve the problem that equipment cost raises, the market competitiveness reduces that available technology adopting audio process chip realizes that tv volume control is brought, a kind of novel TV machine sound accompaniment control circuit is provided, by adopting simple separating component overlap joint, the 3.3V pulse wave signal of CPU output is converted to the sound accompaniment control voltage of 0V to 5V, and then has realized effective control tv volume.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of sound accompaniment control circuit and have the television set of described control circuit, comprise CPU and power amplifier piece, the pulse wave signal of described CPU output connects the control end of a controllable switch element, the gating end one end ground connection of described controllable switch element, the other end connects a direct current power supply through pull-up resistor on the one hand, the volume control pin that connects described power amplifier piece on the other hand through an integrating circuit, and then realization is to the adjusting of television set output volume.
As further qualification to technique scheme, described controllable switch element adopts a NPN type triode to realize, the base stage of described triode connects the impulse wave output of CPU, grounded emitter, collector electrode connects described DC power supply through pull-up resistor on the one hand, connects the volume control pin of described power amplifier piece on the other hand through integrating circuit.The pulse wave signal of described CPU output is the 3.3V pulse wave signal, and the voltage of described DC power supply is+5V.
As further limiting again to technique scheme, described integrating circuit is connected realization by a resistance with electric capacity, wherein, one end of described resistance connects the collector electrode of NPN type triode, the other end connects the volume control pin of described power amplifier piece on the one hand, on the other hand through described capacity earth, and then realize the 3.3V pulse wave signal of CPU output is converted to the voltage signal of 0V to 5V, finish effective control tv volume.
Compared with prior art, advantage of the present utility model and good effect are: the utility model by with the 3.3V pulse wave signal of CPU output via triode, pull-up resistor and+after see-saw circuit that the 5V DC power supply is formed is handled, generate the rp pulse ripple signal of 5V, the integrating circuit of forming through resistance and electric capacity different according to the impulse wave duty ratio again, generate the sound accompaniment control voltage of 0V to 5V, be connected to the volume control pin of power amplifier piece, thereby realized effective adjusting of television set output volume.Sound accompaniment control circuit of the present utility model is simple in structure, with low cost, realized of the conversion of the 3.3V pulse voltage of CPU output to 0V～5V voltage, thereby satisfied of the requirement of the volume control pin of power amplifier piece to input voltage range, under the prerequisite of not using the audio process chip, realized effective adjusting of tv volume.
Description of drawings
Fig. 1 is the schematic diagram of the utility model television audio control circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Among Fig. 1, the 3.3V impulse wave control signal of CPU output connects the base stage of NPN type triode V001 through resistance R 1, the grounded emitter of described NPN type triode V001, collector electrode is on the one hand through pull-up resistor R2 connection+5V DC power supply, and the integrating circuit of forming through resistance R 3 and capacitor C 106 is connected the volume control pin of power amplifier piece on the other hand.Because the signal of CPU output is a pulse wave signal, so triode V001 conducting high level the time, its collector voltage is dragged down, the output low level signal; When impulse wave was low level, triode V001 ended, and collector voltage remains on+5V, so, from the signal of the collector electrode of triode V001 output be+the anti-phase amplification pulse signal of 5V.The integrating circuit that resistance R 3 and capacitor C 106 formed with triode V001 output+the 5V pulse wave signal is converted into the voltage signal in 0～5V scope, output to the volume control pin of power amplifier piece, CPU recently controls the magnitude of voltage of integrating circuit output by the duty of adjusting impulse wave, thereby reaches the purpose of control audio power amplifier piece volume.
The utility model has been realized the conversion of 3.3V impulse wave voltage to the 0～5V range of voltages of CPU output by adopting above-mentioned simple circuit configuration, under the prerequisite of not using special audio process chip, realized effective adjusting of tv volume, thereby simplified circuit structure, reduce cost, improved the competitiveness of product in market.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. sound accompaniment control circuit, comprise CPU and power amplifier piece, it is characterized in that: the pulse wave signal of described CPU output connects the control end of a controllable switch element, the gating end one end ground connection of described controllable switch element, the other end connects a direct current power supply through pull-up resistor on the one hand, the volume control pin that connects described power amplifier piece on the other hand through an integrating circuit, and then realization is to the adjusting of television set output volume.
2. sound accompaniment control circuit according to claim 1, it is characterized in that: described controllable switch element adopts a NPN type triode to realize, the base stage of described triode connects the impulse wave output of CPU, grounded emitter, collector electrode connects described DC power supply through pull-up resistor on the one hand, connects the volume control pin of described power amplifier piece on the other hand through integrating circuit.
3. sound accompaniment control circuit according to claim 1 and 2, it is characterized in that: described integrating circuit is connected realization by a resistance with electric capacity, wherein, one end of described resistance connects the collector electrode of NPN type triode, the other end connects the volume control pin of described power amplifier piece on the one hand, on the other hand through described capacity earth.
4. sound accompaniment control circuit according to claim 3 is characterized in that: the pulse wave signal of described CPU output is the 3.3V pulse wave signal.
5. sound accompaniment control circuit according to claim 4 is characterized in that: the voltage of described DC power supply is+5V.
6. television set with described sound accompaniment control circuit, comprise CPU and power amplifier piece, it is characterized in that: the pulse wave signal of described CPU output connects the control end of a controllable switch element, the gating end one end ground connection of described controllable switch element, the other end connects a direct current power supply through pull-up resistor on the one hand, the volume control pin that connects described power amplifier piece on the other hand through an integrating circuit, and then realization is to the adjusting of television set output volume.
7. television set according to claim 6, it is characterized in that: described controllable switch element adopts a NPN type triode to realize, the base stage of described triode connects the impulse wave output of CPU, grounded emitter, collector electrode connects described DC power supply through pull-up resistor on the one hand, connects the volume control pin of described power amplifier piece on the other hand through integrating circuit.
8. according to claim 6 or 7 described television sets, it is characterized in that: described integrating circuit is connected realization by a resistance with electric capacity, wherein, one end of described resistance connects the collector electrode of NPN type triode, the other end connects the volume control pin of described power amplifier piece on the one hand, on the other hand through described capacity earth.
9. television set according to claim 8 is characterized in that: the pulse wave signal of described CPU output is the 3.3V pulse wave signal.
10. television set according to claim 9 is characterized in that: the voltage of described DC power supply is+5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520125564 CN2845358Y (en) | 2005-12-05 | 2005-12-05 | Sound controlling circuit and TV set therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520125564 CN2845358Y (en) | 2005-12-05 | 2005-12-05 | Sound controlling circuit and TV set therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2845358Y true CN2845358Y (en) | 2006-12-06 |
Family
ID=37487300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520125564 Expired - Fee Related CN2845358Y (en) | 2005-12-05 | 2005-12-05 | Sound controlling circuit and TV set therewith |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2845358Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103258510A (en) * | 2012-05-07 | 2013-08-21 | 深圳Tcl新技术有限公司 | Method and device for backlight driving protection |
| CN103701456A (en) * | 2013-12-30 | 2014-04-02 | 京信通信***（中国）有限公司 | Power amplifier external interface circuit |
| CN106878863A (en) * | 2017-03-03 | 2017-06-20 | 广东欧珀移动通信有限公司 | The voltage adjusting method of power supply and power amplification system and power amplification system |
| CN108364523A (en) * | 2018-05-16 | 2018-08-03 | 广东电网有限责任公司 | High-voltage cable positioning simulation system |
-
2005
- 2005-12-05 CN CN 200520125564 patent/CN2845358Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103258510A (en) * | 2012-05-07 | 2013-08-21 | 深圳Tcl新技术有限公司 | Method and device for backlight driving protection |
| CN103258510B (en) * | 2012-05-07 | 2015-07-01 | 深圳Tcl新技术有限公司 | Method and device for backlight driving protection |
| CN103701456A (en) * | 2013-12-30 | 2014-04-02 | 京信通信***（中国）有限公司 | Power amplifier external interface circuit |
| CN106878863A (en) * | 2017-03-03 | 2017-06-20 | 广东欧珀移动通信有限公司 | The voltage adjusting method of power supply and power amplification system and power amplification system |
| CN108364523A (en) * | 2018-05-16 | 2018-08-03 | 广东电网有限责任公司 | High-voltage cable positioning simulation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |