CN201515435U - Digital television set-top box with sound-source broadcast function - Google Patents
Digital television set-top box with sound-source broadcast function Download PDFInfo
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- CN201515435U CN201515435U CN2009203101263U CN200920310126U CN201515435U CN 201515435 U CN201515435 U CN 201515435U CN 2009203101263 U CN2009203101263 U CN 2009203101263U CN 200920310126 U CN200920310126 U CN 200920310126U CN 201515435 U CN201515435 U CN 201515435U
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- amplifier module
- power amplifier
- top box
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Abstract
The utility model discloses a digital television set-top box with sound-source broadcast function, which comprises an input interface for digital broadcast signals or digital television signals, a demodulating decoder, a signal processor, an output interface for audio and video signals, a power module and a television set-top box casing. An audio amplifier module, a central processing unit and a loudspeaker are arranged in the television set-top box casing; the audio input end of the audio amplifier module and the audio output end of the signal processor are connected; the control end of the audio amplifier module is connected with the central processing unit; and the output end of the audio amplifier module is connected with the loudspeaker. The set-top box is particularly suitable for various regional broadcast services with directional and emergency requirements, such as regional broadcast, emergency notices, telephone conferences, etc. in countryside and large-scale industrial and mining establishments. The utility model is an innovation for digital television set-top boxes, which has the advantages of low hardware cost and strong practicability, and is particularly suitable for being popularized in digital television system in the countryside.
Description
Technical field
The utility model relates to cable digital TV set-top box equipment, particularly a kind of digital TV set-top box that the source of sound broadcast capability is arranged.
Background technology
Cable digital TV set-top box receives the radiofrequency signal from the HFC cable TV network, set-top box is extracted channel encoded signal from transport layer, finish channel demodulation, the source coded signal of reduction compression then, recover original sound, video flowing, finish reception, the parsing of data service and multiple application simultaneously.Idiographic flow: tuner receives the radiofrequency signal from wired network, finishes channel-decoding by qam demodulator, isolates the transmission stream (TS) that comprises sound, video and other data message from carrier wave.Distinguish different programs by demultiplexing, extract corresponding sound, video flowing and data flow, through MPEG-2 decoding and the corresponding software of resolving, finish the reduction of digital information again.Through video d/a and audio frequency D/A conversion, output simulation sound, vision signal, thus make common simulated color television watch high-quality digital TV image and sound accompaniment, can listen to digital broadcast program by television set and active audio amplifier etc.For pay TV, the Conditional Access Module of set-top box is implemented descrambling to sound, video flowing, and adopts the smart card that contains recognition user information, normally watches to guarantee validated user.
Can show from above-mentioned introduction, cable digital TV set-top box in the market is the intermediate equipment that allows the common simulation colour TV can watch Digital Television as a kind of, if not connecting terminal equipment such as colour TV (active audio amplifier etc.), the audient just can not listen to and watch digital information, thus, make the use of Digital Television in various regional broadcast services be subjected to very big restriction.
The utility model content
The purpose of this utility model is to provide a kind of when not enabling the terminal audio ﹠ video equipment for the deficiency that solves above-mentioned technology, by cable TV network, can independently finish the digital TV set-top box that the source of sound broadcast capability is arranged that is subjected to Headend control by set-top box.
In order to achieve the above object, a kind of digital TV set-top box that the source of sound broadcast capability is arranged that the utility model provides, it comprises digital broadcasting or digital television signal input interface, the demodulating and decoding device, signal processor, the AV signal output interface, power module and TV set-top box housing, it is characterized in that in the TV set-top box housing, being provided with audio frequency power amplifier module, central processing unit and loud speaker, the audio input end of audio frequency power amplifier module is connected with the audio output of signal processor, the control end of audio frequency power amplifier module is connected with central processing unit, and the output of audio frequency power amplifier module is connected with loud speaker.Described audio frequency power amplifier module adopts the BTL bridge amplification circuit, and described loud speaker is a 3W power loud speaker, the 3W power loud speaker that the audio frequency power amplifier module driving machine top box of BTL bridge amplification circuit is built-in.Be provided with the low-power consumption shutdown mode in the described audio frequency power amplifier module, when speaker portion was not worked, when promptly not enabling broadcast capability, power amplifier module was in shutdown mode, and its energy consumption only is 0.0035mW.
Described audio frequency power amplifier module with the control of low-power consumption shutdown mode, its circuit mainly is made up of power amplifier module U1, resistor R 1, R2, R3 and coupling capacitance C1, power amplifier module U1 finishes the power amplification to audio signal, and R1, R2 form the gain controlling of power amplifier module; By the 5_Pin output simulated audio signal of the chip U2 of signal processor, this signal is the signal input part (IN-) of power amplifier module U1 through the 6_Pin that coupling capacitance C1 inserts power amplifier module U1; Audio signal is amplified through power amplifier module U1, from the 3_Pin of power amplifier module U1 and the audio-signal-driven loud speaker operate as normal after the 5_Pin output amplification; The 1_Pin of power amplifier module U1 is the shutdown mode control end of audio frequency power amplifier module, insert the 1_Pin (EN) of power amplifier module U1 by the 183_Pin output control signal of the chip U3 of central processing unit, power amplifier module U1 is a mode of operation when this control signal is high level, the audio signal that i.e. output is amplified, the loud speaker broadcast, power amplifier module U1 is a shutdown mode when this control signal is low level, loud speaker is not worked, thereby realizes that central processing unit is the work or the control of shutdown mode to audio frequency power amplifier module.
The digital TV set-top box that the source of sound broadcast capability is arranged that the utility model provides, under the control of central processing unit, broadcasted content is controlled by the digital TV front-end system fully, accomplish the opening and closing of point-to-point control broadcast function, set-top box teleview or the situation of standby under, all can accept the instruction of digital TV front-end system, broadcast in real time by the control of set-top box central processing unit; Behind the off-the-air, set-top box central processing unit output control signal makes power amplifier module be in shutdown mode, and loud speaker quits work, and set-top box automatically restores to original state.
During work, digital broadcasting or digital television signal are received by set-top box and form simulated audio signal after demodulating and decoding and signal processing, thereby simulated audio signal is handled rear drive loud speaker realization set-top box broadcast function through power amplifier module.
The realization of broadcasting function controlled: this set-top box receives the digital broadcast signal that has control command of certain the specific frequency that is sent by the digital television system front end, in aforesaid audio signal, software control by this machine realizes the set-top box automatically switching channels, no matter promptly set-top box is to be in to watch a certain TV programme or set-top box is in holding state at that time, under the software control of this machine, automatically switch to built-in sound source broadcast state, the central processing unit output control signal (high level) of set-top box, open the power amplifier module operate as normal, the loud speaker broadcast.Central processing unit output control signal (low level) makes power amplifier module be in shutdown mode behind the off-the-air, and loud speaker quits work, and set-top box automatically restores to original state.
The digital TV set-top box that the source of sound broadcast capability is arranged that the utility model provides, built-in source of sound broadcast capability can be realized controlled broadcasting by the built-in source of sound broadcast system of set-top box when not enabling terminal audio ﹠ video equipment (as television set, active audio amplifier etc.).By cable TV network, independently finish the various broadcast capabilitys that are subjected to Headend control by set-top box.
The utility model is specially adapted to the audient is had the various regional broadcast services of directed and emergent demand, as the application scenario of rural area and large-scale industrial and mineral cable TV subscriber's regional broadcast, emergent notice, videoconference or the like.Be a kind of innovation and application of digital TV set-top box, hardware cost is low, practical, in today that Digital Television is popularized energetically, but especially has generalization in the rural area digital television system.
Description of drawings
Fig. 1 is that structural representation is formed in each unit of the utility model embodiment;
Fig. 2 is embodiment audio frequency power amplifier module circuit theory diagrams.
Embodiment
The utility model will be further described in conjunction with the accompanying drawings below by embodiment.
As Fig. 1, shown in Figure 2, a kind of digital TV set-top box that the source of sound broadcast capability is arranged that present embodiment is described, it comprises digital broadcasting or digital television signal input interface 1, demodulating and decoding device 2, signal processor 3, AV signal output interface 4, power module 5 and TV set-top box housing 6, in TV set-top box housing 6, be provided with audio frequency power amplifier module 7, central processing unit 8 and loud speaker 9, the audio input end 7-1 of audio frequency power amplifier module 7 is connected with the audio output 3-1 of signal processor 3, the control end 7-2 of audio frequency power amplifier module 7 is connected with central processing unit 8, and the output 7-3 of audio frequency power amplifier module 7 is connected with loud speaker 9.Described audio frequency power amplifier module 7 adopts the BTL bridge amplification circuit, and described loud speaker 9 can adopt 3W power loud speaker, the built-in 3W power loud speaker 9 of audio frequency power amplifier module 7 driving machine top boxs of BTL bridge amplification circuit.Be provided with the low-power consumption shutdown mode in the described audio frequency power amplifier module 7, when loud speaker 9 was not worked, when promptly not enabling broadcast capability, audio frequency power amplifier module 7 was in shutdown mode, and its energy consumption only is 0.0035mW.
Shown in Figure 2 is the circuit theory diagrams with audio frequency power amplifier module 7 of low-power consumption shutdown mode control, described audio frequency power amplifier module 7, its circuit mainly is made up of power amplifier module U1, resistor R 1, R2, R3 and coupling capacitance C1, power amplifier module U1 finishes the power amplification to audio signal, and R1, R2 form the gain controlling of power amplifier module; By the 5_Pin output simulated audio signal of the chip U2 of signal processor, this signal is the signal input part (IN-) of power amplifier module U1 through the 6_Pin that coupling capacitance C1 inserts power amplifier module U1; Audio signal is amplified through power amplifier module U1, from the 3_Pin of power amplifier module U1 and the audio-signal-driven loud speaker operate as normal after the 5_Pin output amplification; The 1_Pin of power amplifier module U1 is the shutdown mode control end of audio frequency power amplifier module 7, insert the 1_Pin (EN) of power amplifier module U1 by the 183_Pin output control signal of the chip U3 of central processing unit 8, power amplifier module U1 is a mode of operation when this control signal is high level, the audio signal that i.e. output is amplified, loud speaker 9 broadcasts, power amplifier module U1 is a shutdown mode when this control signal is low level, loud speaker 9 is not worked, thereby realizes that 8 pairs of audio frequency power amplifier module 7 of central processing unit are the work or the control of shutdown mode.
Claims (4)
1.
A kind of digital TV set-top box that the source of sound broadcast capability is arranged, it comprises digital broadcasting or digital television signal input interface, demodulating and decoding device, signal processor, AV signal output interface, power module and TV set-top box housing, it is characterized in that in the TV set-top box housing, being provided with audio frequency power amplifier module, central processing unit and loud speaker, the audio input end of audio frequency power amplifier module is connected with the audio output of signal processor, the control end of audio frequency power amplifier module is connected with central processing unit, and the output of audio frequency power amplifier module is connected with loud speaker.
2.
The digital TV set-top box that the source of sound broadcast capability is arranged according to claim 1, it is characterized in that described audio frequency power amplifier module adopts the BTL bridge amplification circuit, described loud speaker is a 3W power loud speaker, the 3W power loud speaker that the audio frequency power amplifier module driving machine top box of BTL bridge amplification circuit is built-in.
3.
The digital TV set-top box that the source of sound broadcast capability is arranged according to claim 1 and 2 is characterized in that being provided with in the described audio frequency power amplifier module low-power consumption shutdown mode.
4.
The digital TV set-top box that the source of sound broadcast capability is arranged according to claim 1 and 2, it is characterized in that described audio frequency power amplifier module, its circuit mainly is made up of power amplifier module U1, resistor R 1, R2, R3 and coupling capacitance C1, power amplifier module U1 finishes the power amplification to audio signal, and R1, R2 form the gain controlling of power amplifier module; By the 5_Pin output simulated audio signal of the chip U2 of signal processor, this signal is the signal input part (IN-) of power amplifier module U1 through the 6_Pin that coupling capacitance C1 inserts power amplifier module U1; Audio signal is amplified through power amplifier module U1, from the 3_Pin of power amplifier module U1 and the audio-signal-driven loud speaker operate as normal after the 5_Pin output amplification; The 1_Pin of power amplifier module U1 is the shutdown mode control end of audio frequency power amplifier module, insert the 1_Pin (EN) of power amplifier module U1 by the 183_Pin output control signal of the chip U3 of central processing unit 8, power amplifier module U1 is a mode of operation when this control signal is high level, the audio signal that i.e. output is amplified, the loud speaker broadcast, power amplifier module U1 is a shutdown mode when this control signal is low level, loud speaker is not worked, thereby realizes that central processing unit is the work or the control of shutdown mode to audio frequency power amplifier module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203101263U CN201515435U (en) | 2009-09-11 | 2009-09-11 | Digital television set-top box with sound-source broadcast function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203101263U CN201515435U (en) | 2009-09-11 | 2009-09-11 | Digital television set-top box with sound-source broadcast function |
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| Publication Number | Publication Date |
|---|---|
| CN201515435U true CN201515435U (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203101263U Expired - Fee Related CN201515435U (en) | 2009-09-11 | 2009-09-11 | Digital television set-top box with sound-source broadcast function |
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| CN (1) | CN201515435U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533385A (en) * | 2012-07-03 | 2014-01-22 | 成都华塑电子技术开发有限公司 | Method for realizing intelligent emergency broadcast on ground digital television system |
-
2009
- 2009-09-11 CN CN2009203101263U patent/CN201515435U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533385A (en) * | 2012-07-03 | 2014-01-22 | 成都华塑电子技术开发有限公司 | Method for realizing intelligent emergency broadcast on ground digital television system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100623 Termination date: 20140911 |
|
| EXPY | Termination of patent right or utility model |