CN2845351Y - Set-top box with audio power amplifying circuit inside - Google Patents
Set-top box with audio power amplifying circuit inside Download PDFInfo
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- CN2845351Y CN2845351Y CNU200520125588XU CN200520125588U CN2845351Y CN 2845351 Y CN2845351 Y CN 2845351Y CN U200520125588X U CNU200520125588X U CN U200520125588XU CN 200520125588 U CN200520125588 U CN 200520125588U CN 2845351 Y CN2845351 Y CN 2845351Y
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Abstract
The utility model discloses a set-top box with a built-in audio power amplifying circuit. The utility model comprises a CPU, a DC power supply, an audio signal input end and a power amplifying circuit, wherein the input end of the power amplifying circuit is connected with the audio signal input end, and the output end of the power amplifying circuit is connected with a loudspeaker; the mute sound signal output end of the CPU is connected with the power supply end of the power amplifying circuit through a switching circuit, and whether the power amplifying circuit is powered or not is determined according to the received mute sound signals so as to achieve the output and stop of accompanying sound signals so that the existing digital set-top box has the function of audio play. When a user selects and watches TV programs, the mute sound of the set-top box can be conveniently achieved through a remote controller so as to guarantee the normal watch of the TV programs; when the user selects and watches radio broadcasting, radio programs can be normally played without switching on a TV or a sounding device, which effectively economizes energy sources and raises the actual application value of the set-top box.
Description
Technical field
The utility model relates to a kind of improvement of set-top box circuit, specifically, relates to a kind of audio power amplifier circuit that is built in the set-top box circuit.
Background technology
At present, television broadcasting signal becomes digital signal from analog-signal transitions gradually, in order to allow the normal TV reception of user that uses simulated television, top box of digital machine arises at the historic moment, and kind is also various day by day, comprises digital TV set-top box, set top box for satellite receiver, IPTV set-top box etc.For existing these set-top box, only can come display image and play sound by terminal equipments such as television set, sound equipments, set-top box itself does not have the function of voice playing.Because set-top box and playing audio/video are difficult to accomplish interlock, this has just limited the usefulness of set-top box greatly.Such as, cable TV subscriber when using the broadcasting of set-top box listening to audio, the image displaying part of its television set on-state of also having to be in, this has just caused unnecessary energy waste.
Summary of the invention
The utility model is in order to solve set-top box itself in the prior art owing to do not possess the voice playing function, thereby make the user when listening to audio is broadcasted, have to television set is in on-state, the energy waste problem that is caused, a kind of novel set-top box with built-in audio power amplifier circuit is provided, by built-in audio power amplifier circuit and miniature loudspeaker in existing set-top box, make set-top box not connect external television, under the situation of terminal equipments such as sound equipment, also can realize the accurate output of audio signal, thereby effectively expanded the application function of set-top box, saved the energy.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of set-top box with built-in audio power amplifier circuit, comprise CPU, DC power supply and audio signal input end, in described set-top box circuit, also include a power amplification circuit, the input of described power amplification circuit connects audio signal input end, output connects loud speaker, the mute signal output of CPU links to each other with described power amplification circuit, the output of power controlling amplifying circuit with end.
As the further qualification to technique scheme, the mute signal output of described CPU can be connected the quiet end of power amplification circuit, and the sound accompaniment that power amplification circuit is blocked its output according to the mute signal that receives is exported, and realizes quiet; Can also be connected the power supply end of power amplification circuit by switching circuit, according to the decision of the mute signal that receives whether to the power amplification circuit power supply, and then the output that realizes audio signal with end.The second way that adopts the utility model realizes the quiet control to set-top box, the specific implementation method is: the mute signal output of CPU connects the control end of a controllable switch element, the gating end connects the power supply end of power amplification circuit, and exports high-level DC voltage or control its ground connection to the power supply end of power amplification circuit according to the on off state of controllable switch element.
As further limiting again to technique scheme, described controllable switch element adopts a NPN type triode to realize, the base stage of described NPN type triode connects the mute signal output of CPU, and through pull-up resistor connection one+5V DC power supply, grounded emitter, collector electrode connects described+5V DC power supply through a relay, and the normally opened contact of described relay is connected between the power supply end of one+16V DC power supply and power amplification circuit.Be parallel with a switching diode at described relay two ends, the positive pole of described switching diode connects the collector electrode of NPN type triode, negative pole connection+5V DC power supply.
Fixed as the further again elder generation to technique scheme, the sound accompaniment output of described set-top box inside is connected the input of described power amplification circuit with coupling capacitance by the emitter follower of standard.Described power amplification circuit adopts an integrated amplifier chip to realize, its input and power supply end are respectively hung oneself, and the resistance and the electric capacity of connection are formed filter network ground connection in the lump.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is by setting up audio power amplifier circuit and loud speaker in existing set-top box circuit, the audio signal that set-top box receives is carried out exporting by loud speaker after the processing and amplifying, and then make existing top box of digital machine have the voice playing function.When the user selects to listen to station broadcast, can turn on the normal broadcast that television set or stereo set just can be realized program of radio station, thereby effectively avoid the waste of the energy, improved the actual application value of set-top box.When the user selects TV reception, can realize the quiet of set-top box easily by remote controller, thereby guarantee normally watching of TV programme.
Description of drawings
Fig. 1 is the theory diagram of audio power amplifier circuit in the utility model;
Fig. 2 is the concrete circuit connection diagram of Fig. 1.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
The utility model has been set up audio power amplifier circuit as shown in Figure 1 in order to realize the sound accompaniment output function of top box of digital machine in the set-top box circuit.The audio signal of the input receiving set up box inside of power amplifier carries out being connected by its output after the processing and amplifying input of loud speaker BL1 to it, provides audio frequency output by loud speaker BL1 to the user.When the user selects TV reception or require set-top box quiet, CPU ends by the triode V1 of its GPIO mouth output low level mute signal control as switch element, to power amplifier output mute signal, block its sound accompaniment output, realize the mute function of set-top box.The concrete line connecting relation of described power amplifier is referring to shown in Figure 2.
Among Fig. 2, power amplifier adopts an integrated amplifier chip N1 to realize, the sound accompaniment output of set-top box inside is connected to the input IN of power amplifier chip N1 through resistance R 1 and coupling capacitance C3 by emitter follower (figure part omitted) one side of standard, the filter network ground connection of forming via parallel resistor R2 and capacitor C 2 on the other hand, the wave interference of making an uproar in the filtering audio signal.The mute signal MUTE of CPU output connects the base stage of NPN type triode V1 through resistance R 6, the grounded emitter of described triode V1, collector electrode is through relay R L1 connection+5V DC power supply, be parallel with switching diode VD1 at the two ends of described relay R L1 coil, its normally opened contact is connected+the power supply end VCC of 16V DC power supply and power amplifier chip N1 between.When the user selects by set-top box broadcast station broadcast, the quiet pin MUTE output high level signal of CPU, triode V1 conducting, + 5V DC power supply is by the collector and emitter ground connection of relay R L1, triode V1, constitute the loop, the normally opened contact closure of relay R L1 ,+16V power supply is after rc filter circuit R4, C6 filtering, and N1 provides working power for the power amplifier chip.After described power amplifier chip N1 carried out processing and amplifying with the audio signal that receives, OUT exported to loud speaker BL1 by its output, realized effective output of sound.Top box of digital machine generally all has two-way sound accompaniment output, realizes that for reducing cost and being convenient to set-top box disclosed in the utility model only selects road L voice-grade channel wherein to handle.Realize the two-way output of audio signal, only need on the R voice-grade channel of another road, set up identical power amplifier and can realize that the two-way of audio signal reliably exports.
When the user selects to watch TV programme or require set-top box quiet, press the independent mute button that is provided with on the remote controller, CPU is changed to low level with its quiet pin MUTE, triode V1 ends, relay R L1 outage, its normally opened contact disconnects, + 16V power supply stops described power amplifier chip N1 power supply, power amplifier chip N1 quits work, the blocking-up audio signal is by loud speaker BL 1 output, thereby realize the mute function of set-top box, the assurance audio signal is guaranteed normally watching of TV programme by the output of terminal equipments such as television set or sound equipment.
Because set-top box of the present utility model has possessed the sound accompaniment output function, therefore,, can realize the timing prompting function of set-top box easily in conjunction with the timing function of existing set-top box.In the actions menu of set-top box, increase the options of inner sound accompaniment switch, the switch of internal loudspeaker is set with this; And the options of timed power on/off, comprise be provided with switching time, timing start-up is provided with etc., realizes regularly prompting function by the audio power amplifier circuit.On the indication panel of set-top box, increased independently indicator light, to show the operation of difference in functionality.
The utility model has been realized the sound accompaniment output function of set-top box by adopting above-mentioned simple circuit configuration, make the user when selecting to listen to station broadcast, can turn on television set or stereo set and just can realize the normal broadcast of program of radio station, thereby effectively avoided the waste of the energy, and make set-top box possess the miscellaneous function of regularly reminding, strengthened the practicality of top box of digital machine.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 (8)
1. set-top box with built-in audio power amplifier circuit, comprise CPU, DC power supply and audio signal input end, it is characterized in that: in described set-top box circuit, also include a power amplification circuit, the input of described power amplification circuit connects audio signal input end, output connects loud speaker, the mute signal output of CPU links to each other with described power amplification circuit, the output of power controlling amplifying circuit with end.
2. the set-top box with built-in audio power amplifier circuit according to claim 1 is characterized in that: the mute signal output of described CPU connects the quiet end of power amplification circuit.
3. the set-top box with built-in audio power amplifier circuit according to claim 1 is characterized in that: the mute signal output of described CPU connects the power supply end of power amplification circuit through a controllable switch element; The control end of described controllable switch element connects the mute signal output of CPU, its gating end connects the power supply end of power amplification circuit, and exports high-level DC voltage or control its ground connection to the power supply end of power amplification circuit according to the on off state of controllable switch element.
4. the set-top box with built-in audio power amplifier circuit according to claim 3, it is characterized in that: described controllable switch element adopts a NPN type triode to realize, the base stage of described NPN type triode connects the mute signal output of CPU, and connect a direct current power supply through pull-up resistor, grounded emitter, collector electrode connects described DC power supply on the one hand, connects the power supply end of power amplification circuit on the other hand.
5. the set-top box with built-in audio power amplifier circuit according to claim 4, it is characterized in that: the collector electrode of described NPN type triode connects described DC power supply through a relay, and the normally opened contact of described relay is connected between the power supply end of another DC power supply and power amplification circuit.
6. the set-top box with built-in audio power amplifier circuit according to claim 5, it is characterized in that: be parallel with a switching diode at described relay two ends, the positive pole of described switching diode connects the collector electrode of NPN type triode, and negative pole connects described DC power supply.
7. according to claim 5 or 6 described set-top box with built-in audio power amplifier circuit, it is characterized in that: the sound accompaniment output of described set-top box inside is connected the input of described power amplification circuit with coupling capacitance by the emitter follower of standard.
8. the set-top box with built-in audio power amplifier circuit according to claim 7 is characterized in that: described power amplification circuit adopts an integrated amplifier chip to realize, its power supply end is formed filter network ground connection through parallel resistor and electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200520125588XU CN2845351Y (en) | 2005-12-07 | 2005-12-07 | Set-top box with audio power amplifying circuit inside |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200520125588XU CN2845351Y (en) | 2005-12-07 | 2005-12-07 | Set-top box with audio power amplifying circuit inside |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2845351Y true CN2845351Y (en) | 2006-12-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200520125588XU Expired - Fee Related CN2845351Y (en) | 2005-12-07 | 2005-12-07 | Set-top box with audio power amplifying circuit inside |
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| Country | Link |
|---|---|
| CN (1) | CN2845351Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812092A (en) * | 2014-02-25 | 2014-05-21 | 天津市畅悦电子科技有限公司 | Protection circuit for high-power audio output horn |
-
2005
- 2005-12-07 CN CNU200520125588XU patent/CN2845351Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812092A (en) * | 2014-02-25 | 2014-05-21 | 天津市畅悦电子科技有限公司 | Protection circuit for high-power audio output horn |
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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 |