CN202889542U - Set top box with audio output function - Google Patents
Set top box with audio output function Download PDFInfo
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- CN202889542U CN202889542U CN 201220616006 CN201220616006U CN202889542U CN 202889542 U CN202889542 U CN 202889542U CN 201220616006 CN201220616006 CN 201220616006 CN 201220616006 U CN201220616006 U CN 201220616006U CN 202889542 U CN202889542 U CN 202889542U
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- top box
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Abstract
The utility model discloses a set top box with an audio output function. The set top box comprises an audio and video decoder, an audio amplifier and a speaker, wherein the audio amplifier receives an audio signal output by the audio and video decoder, and outputs to the speaker to carry out audio playing after carrying out power amplification treatment. An audio power amplifier output channel is arranged on a PCB (printed circuit board) of the set top box, so that the set top box product has a voice output function, and can meet the requirements of independently listening to the radio and emergency notification by the set top box; daily use of a user is facilitated when the application range of the set top box is expanded; the energy source is saved, and the set top box can better meet green and environment-friendly social development requirements compared with the traditional set top box design scheme.
Description
Technical field
The utility model belongs to the top box of digital machine technical field, specifically, relates to a kind of voicefrequency circuit design that is applied in the set-top box product.
Background technology
Along with the fast transformation of television broadcasting signal from analog signal to digital signal, be used for converting the digital television signal that TV and Radio Service sends to analog signal to satisfy user family's television set and receive and the top box of digital machine product of broadcast request is configured and uses by increasing TV user.Present set-top box product, its audio frequency output generally all is to adopt the small-signal audio frequency way of output, the weak signal of the players such as similar DVD, power is little, audio input end of necessary external power amplifier and loudspeaker apparatus or connecting TV machine, could realize the amplification output of audio signal by the voice-frequency channel in the television set, make people's ear can hear the sound accompaniment of program.
Obviously, this traditional audio frequency way of output, when the user receives radio broadcasting signal by set-top box, for example during the FM FM signal, also must turn on television set could normally listen to, thereby the unnecessary waste that causes electric energy, do not meet now energy-conservation, reduce discharging, the megatrend of green, environmental protection.
Summary of the invention
The purpose of this utility model is to provide a kind of set-top box with audio output function, so that the set-top box product can play sound separately the range of application of striking machine top box product, user friendly routine use.
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 audio output function, comprise audio/video decoder, audio frequency amplifier and loud speaker, described audio frequency amplifier receives the audio signal of audio/video decoder output, and after carrying out the power amplification processing, exports described loud speaker to and carry out the audio frequency broadcast.
Preferably, described audio frequency amplifier is selected to be communicated with L channel audio output or the right audio channel lead-out terminal of audio/video decoder by voice-frequency channel, receives the audio signal of a sound channel, carries out power amplifier output.
Further, include a positive-negative-positive triode in described voice-frequency channel, the base stage of described positive-negative-positive triode connects L channel audio output or the right audio channel lead-out terminal of audio/video decoder, and connects DC power supply by pull-up resistor; The emitter of described positive-negative-positive triode connects described DC power supply by current-limiting resistance, and connects the audio input end of audio frequency amplifier by capacitance; The grounded collector of described positive-negative-positive triode.
In order to realize the selection access of a channel audio signal, described voice-frequency channel comprises two, article one, be connected between the audio input end of L channel audio output of audio/video decoder and audio frequency amplifier, another is connected between the audio input end of the right audio channel lead-out terminal of audio/video decoder and audio frequency amplifier; All be in series with a gating switch in each bar voice-frequency channel, described gating switch is connected to voice-frequency channel and connects L channel audio output of audio/video decoder or a side of right audio channel lead-out terminal.By conducting of two gating switches is set, a shutoff is with gating voice-frequency channel wherein.
Further, described gating switch can be jumper wire device, also can be the pad for the welding zero resistance.
Preferably, the audio signal of exporting by described audio/video decoder is single-ended audio signal, and the audio input end of audio frequency amplifier is differential terminal; Described audio frequency amplifier receives the single-ended audio signal of audio/video decoder output by the audio input end of its negative polarity, the audio input end of positive polarity is by resistance and the capacity earth of series connection.
Further, described audio frequency amplifier output difference multi-voice frequency signal transfers to described loud speaker by magnetic bead and low pass filter, with the filtering electromagnetic interference, improves the audio frequency output quality.
Further again, the feeder ear of described audio frequency amplifier connects DC power supply, in order to guarantee the efficient of audio frequency amplifier, described DC power supply is passed through decoupling capacitor ground connection.
In order to realize the switch control to the set-top box audio output function, with the Enable Pin connection CPU of described audio frequency amplifier, receive the enable signal of CPU output; Described CPU can independently be arranged on the pcb board of set-top box, also can be built in the described audio/video decoder, namely adopts the audio/video decoder be integrated with CPU to carry out the PCB circuit design of set-top box, to simplify circuit structure.
Preferably, described audio frequency amplifier preferably adopts D class audio frequency power amplification chip; Described loud speaker preferably adopts miniature loudspeaker, with the rising of controller set-top box hardware cost.
Compared with prior art, advantage of the present utility model and good effect are: the utility model arranges the audio frequency power amplifier output channel by the pcb board in set-top box, so that the set-top box product has possessed the function of voice output, can satisfy the needs that utilize set-top box to listen to separately radio broadcasting and emergent notice, in striking machine top box range of application, make things convenient for user's routine use, saved the energy, compared the social development requirement that traditional set-top box design scheme more can satisfy environmental protection.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art.Apparently, the accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the set-top box with audio output function that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of Fig. 1 sound intermediate frequency output circuit.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described.Obviously, described embodiment only is a part of embodiment in the utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making all other embodiment that obtain under the creative work prerequisite, all belong to the scope of the utility model protection.
For the advantage that makes technical solutions of the utility model is clearer, below in conjunction with drawings and Examples the utility model is explained.
For the top box of digital machine product, reception and processing requirements in order to realize digital broadcast signal are provided with tuner, demodulation chip and audio/video decoder at its pcb board, referring to shown in Figure 1.Described tuner is used for received tv broadcast signal, and converts the demodulation chip that intermediate-freuqncy signal IF transfers to rear class to.After described demodulation chip carries out demodulation process to the intermediate-freuqncy signal IF that receives, form with data flow TS transfers to follow-up audio/video decoder, after utilizing the audio/video decoder realization that the decoding of audio and video data streams TS is processed, outputting video signal and low power audio signal, transfer to outside television set by the audio frequency and video lead-out terminal that is arranged on the set-top box, and then realize the broadcast output of audio/video program by television set.
In order to make set-top box have the function of output sound, the present embodiment has increased the audio frequency power amplifier output channel in the circuit design of set-top box, as shown in Figure 1.To be divided into two-way by the audio signal of audio/video decoder decoding output, one the tunnel transfers to the audio frequency and video lead-out terminal as usual, another road transfers to described audio frequency power amplifier output channel, carry out the power amplification processing of audio signal via described audio frequency power amplifier output channel after, drive loud speaker and play output.
Below in conjunction with Fig. 2 concrete assembling structure and the operation principle thereof of the audio frequency power amplifier output channel of the present embodiment are at length set forth.
Referring to shown in Figure 2, in the audio frequency power amplifier output channel of the present embodiment, be provided with audio frequency amplifier U9 and loud speaker J6.Described audio frequency amplifier U9 preferably adopts the D class audio frequency power amplification chip of low cost, high integration to carry out the specific design of audio frequency power amplifier output channel, receive the audio signal of audio/video decoder decoding output, and after it is carried out power amplification and process, drive loud speaker J6 and play sound.
In order to satisfy the Miniaturization Design requirement of set-top box, described loud speaker J6 preferably adopts Hz-KHz in the miniaturized loudspeakers of 0-10KHz, under the prerequisite that satisfies the voice output requirement, guarantees that the complete machine size of set-top box is unaffected.
Because the audio signal by audio/video decoder decoding output comprises left channel audio signal AUDIO_L and right channel audio signal AUDIO_R two-way, for the audio frequency amplifier U9 that only supports the access of one tunnel audio signal, can carry out power amplifier output by the audio signal of a sound channel of voice-frequency channel selective reception, that can satisfy equally sound normally listens to requirement.In order to satisfy the selection broadcast request of two channel audio signal, the present embodiment is between the audio input end of the L channel audio output of audio/video decoder and audio frequency amplifier U9, and design respectively a voice-frequency channel between the audio input end of the right audio channel lead-out terminal of audio/video decoder and audio frequency amplifier U9, by gating voice-frequency channel wherein, the selection of one tunnel audio signal is wherein play realizing.
In order to make things convenient for the gating of voice-frequency channel, the gating switch of in each bar voice-frequency channel, all connecting, jumper wire device or be used for the pad of welding zero resistance R104, R105 for example, be connected respectively in L channel audio output of voice-frequency channel connection audio/video decoder and a side of right audio channel lead-out terminal, as shown in Figure 2.When selecting to play left channel audio signal AUDIO_L, only will be communicated with the gating switch that L channel audio output of audio/video decoder is in series, for the design of selecting pad, zero resistance R105 directly can be welded on the pad, to realize the gating to this voice-frequency channel.In like manner, when selecting to play right channel audio signal AUDIO_R, only will be communicated with the gating switch that the right audio channel lead-out terminal of audio/video decoder is in series, and then the right channel audio signal AUDIO_R that the audio/video decoder decoding is exported transfers to audio frequency amplifier U9, and after carrying out the power amplification processing, play output by loud speaker J6.
In each bar voice-frequency channel, all be designed with the isolating amplifier circuit that cooperates peripheral circuit to form by positive-negative-positive triode Q10 or Q11, as shown in Figure 2, be used for the right channel audio signal AUDIO_R of audio/video decoder decoding output or left channel audio signal AUDIO_L are isolated and amplify processing.The present embodiment is only take the voice-frequency channel that connects R channel as example, and the assembling structure of described isolating amplifier circuit is specifically described.The base stage of positive-negative-positive triode Q10 is connected gating switch by resistance R 148, for example weld the pad of zero resistance R104, and connect DC power supply+5V_spk by pull-up resistor R145 respectively, by resistance R 149 ground connection.With the grounded collector of positive-negative-positive triode Q10, emitter connects the audio input end of audio frequency amplifier U9 on the one hand by resistance R 146, be connected DC power supply+5V_spk by current-limiting resistance R147 with filter inductance L3 on the other hand.When selecting to play right channel audio signal AUDIO_R, welding zero resistance R104, utilization by positive-negative-positive triode Q10 cooperate isolating amplifier circuit that peripheral circuit forms to right channel audio signal AUDIO_R isolate amplify processing with amplitude after, transfer to audio frequency amplifier U9 via capacitance C109 and current-limiting resistance R157.
Be single-ended audio signal for the audio signal by audio/video decoder output, and audio frequency amplifier U9 can only receive the situation of difference audio signal, the present embodiment adopts the audio input end IN-with the negative polarity of audio frequency amplifier U9 to be connected voice-frequency channel by capacitance C109 with current-limiting resistance R157, the audio input end IN+ of positive polarity is by the mode of resistance R 154 and capacitor C 108 ground connection, single-ended audio signal is configured to false difference audio signal, to satisfy the audio frequency access requirement of audio frequency amplifier U9.
Carry out power amplification by audio frequency amplifier U9 and process rear left channel audio signal or the right channel audio signal that generates, form with differential signal, the sub-OUT+ of difference audio output, OUT-via audio frequency amplifier U9 export loud speaker J6 to, externally play output to drive loud speaker J6.
In order to improve the quality of loud speaker J6 output sound, the present embodiment also is designed with magnetic bead FB26, FB27 and low pass filter in the audio transmission path of audio frequency amplifier U9 connection loud speaker J6, as shown in Figure 2.Described magnetic bead FB26, FB27 are connected on respectively between the sub-OUT+ of difference audio output, the OUT-and loud speaker J6 of audio frequency amplifier U9, are used for suppressing the electromagnetic noise of circuit; Adopt resistance R 152 and capacitor C 87, C106(or resistance R 88 and capacitor C 73, C110) form the RC low pass filter, be connected between the audio input end and ground of loud speaker J6, with the filtering High-frequency Interference.
In order to guarantee the operating efficiency of audio frequency amplifier U9, will be connected to for the DC power supply+5V_spk of audio frequency amplifier U9 power supply the feeder ear VDD of audio frequency amplifier U9 by decoupling capacitor C104, C105.Described decoupling capacitor C104, C105 are connected between DC power supply+5V_spk and the ground, are used for the conducted interference of filtering circuit.
For the sound output function of set-top box is realized switch control, the present embodiment utilizes the processor in the set-top box to receive user's operational order, and then generate Enable Pin/EN that effective or invalid enable signal SPEAKER_EN exports audio frequency amplifier U9 to, to realize the control that enables to audio frequency amplifier U9.The user illustrates: when need to or meet an urgent need notice by the independent broadcast listening of set-top box, sound output function by remote controller starter motor top box, processor is after receiving and parsing this operational order of user, export for example high level of effective enable signal SPEAKER_EN(), transfer to the base stage of a NPN type triode Q9, control described NPN type triode Q9 saturation conduction.Because the grounded emitter of described NPN type triode Q9, therefore the current potential with its collector electrode drags down, and the current potential that makes Enable Pin/EN of audio frequency amplifier U9 is low, and control audio frequency amplifier U9 starts operation, after the audio signal that receives carried out power amplification and process, drive loud speaker J6 and play out.Otherwise when the sound output function of user's closure plane top box, the invalid enable signal SPEAKER_EN(of processor output is low level for example), control NPN type triode Q9 cut-off.At this moment, DC power supply+5V_spk acts on Enable Pin/EN of audio frequency amplifier U9 by current-limiting resistance R151, R153, Enable Pin/EN of audio frequency amplifier U9 is set to invalid high level state, and then control audio frequency amplifier U9 is out of service, the blocking-up audio signal is to the output of loud speaker J6.
The set-top box of the present embodiment is by adopting D class audio frequency power amplifier chips to cooperate the loudspeaker design audio frequency power amplifier output circuit of miniaturization, not only reduced the power reguirements to the set-top box complete machine, and reduced peripheral components, avoided too much taking the PCB of set-top box space, keeping the set-top box impregnable while of original size, effectively controlled the increase of complete machine cost.
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 the variation that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement also should belong to protection range of the present utility model.
Claims (10)
1. set-top box with audio output function, it is characterized in that: comprise audio/video decoder, audio frequency amplifier and loud speaker, described audio frequency amplifier receives the audio signal of audio/video decoder output, and after carrying out the power amplification processing, exports described loud speaker to and carry out the audio frequency broadcast.
2. the set-top box with audio output function according to claim 1, it is characterized in that: described audio frequency amplifier is communicated with L channel audio output or the right audio channel lead-out terminal of audio/video decoder by voice-frequency channel, receives the audio signal of a sound channel.
3. the set-top box with audio output function according to claim 2, it is characterized in that: in described voice-frequency channel, include a positive-negative-positive triode, the base stage of described positive-negative-positive triode connects L channel audio output or the right audio channel lead-out terminal of audio/video decoder, and connects DC power supply by pull-up resistor; The emitter of described positive-negative-positive triode connects described DC power supply by current-limiting resistance, and connects the audio input end of audio frequency amplifier by capacitance; The grounded collector of described positive-negative-positive triode.
4. the set-top box with audio output function according to claim 2, it is characterized in that: described voice-frequency channel comprises two, article one, be connected between the audio input end of L channel audio output of audio/video decoder and audio frequency amplifier, another is connected between the audio input end of the right audio channel lead-out terminal of audio/video decoder and audio frequency amplifier; All be in series with a gating switch in each bar voice-frequency channel, described gating switch is connected to voice-frequency channel and connects L channel audio output of audio/video decoder or a side of right audio channel lead-out terminal.
5. the set-top box with audio output function according to claim 4 is characterized in that: described gating switch is jumper wire device or the pad that is used for the welding zero resistance.
6. each described set-top box with audio output function in 5 according to claim 1, it is characterized in that: the audio signal by described audio/video decoder output is single-ended audio signal, and the audio input end of audio frequency amplifier is differential terminal; Described audio frequency amplifier receives the single-ended audio signal of audio/video decoder output by the audio input end of its negative polarity, the audio input end of positive polarity is by resistance and the capacity earth of series connection.
7. the set-top box with audio output function according to claim 6, it is characterized in that: described audio frequency amplifier output difference multi-voice frequency signal transfers to described loud speaker by magnetic bead and low pass filter.
8. the set-top box with audio output function according to claim 6 is characterized in that: the feeder ear of described audio frequency amplifier connects DC power supply, and described DC power supply is by decoupling capacitor ground connection.
9. each described set-top box with audio output function in 5 according to claim 1, it is characterized in that: the Enable Pin of described audio frequency amplifier connects CPU, receives the enable signal of CPU output; Described CPU independently is arranged on the pcb board of set-top box or is built in the described audio/video decoder.
10. each described set-top box with audio output function in 5 according to claim 1, it is characterized in that: described audio frequency amplifier is D class audio frequency power amplification chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220616006 CN202889542U (en) | 2012-11-20 | 2012-11-20 | Set top box with audio output function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220616006 CN202889542U (en) | 2012-11-20 | 2012-11-20 | Set top box with audio output function |
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| CN202889542U true CN202889542U (en) | 2013-04-17 |
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| CN 201220616006 Expired - Fee Related CN202889542U (en) | 2012-11-20 | 2012-11-20 | Set top box with audio output function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017101360A1 (en) * | 2015-12-15 | 2017-06-22 | 乐视控股（北京）有限公司 | Set-top box apparatus with integrated loudspeaker box |
| CN108040314A (en) * | 2017-12-27 | 2018-05-15 | ***通信集团福建有限公司 | A kind of pattern of fusion intelligent sound box of the multichannel of flexibly configurable |
| CN109907035A (en) * | 2019-04-25 | 2019-06-21 | 杨敏 | A kind of orchard Intelligent acousto-optic bird-scaring unit |
-
2012
- 2012-11-20 CN CN 201220616006 patent/CN202889542U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017101360A1 (en) * | 2015-12-15 | 2017-06-22 | 乐视控股（北京）有限公司 | Set-top box apparatus with integrated loudspeaker box |
| CN108040314A (en) * | 2017-12-27 | 2018-05-15 | ***通信集团福建有限公司 | A kind of pattern of fusion intelligent sound box of the multichannel of flexibly configurable |
| CN109907035A (en) * | 2019-04-25 | 2019-06-21 | 杨敏 | A kind of orchard Intelligent acousto-optic bird-scaring unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20191120 |
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| CF01 | Termination of patent right due to non-payment of annual fee |