CN104539990B - Set-top box signal output control circuit and set top box - Google Patents
Set-top box signal output control circuit and set top box Download PDFInfo
- Publication number
- CN104539990B CN104539990B CN201410834838.0A CN201410834838A CN104539990B CN 104539990 B CN104539990 B CN 104539990B CN 201410834838 A CN201410834838 A CN 201410834838A CN 104539990 B CN104539990 B CN 104539990B
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- resistance
- comparator
- pdif
- external equipment
- resistor
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Telephone Function (AREA)
Abstract
The present invention relates to a kind of set-top box signal output control circuit and set top box, whether detection S/PDIF interfaces have external equipment insertion, according to level corresponding to detection output, whether external equipment insertion is had according to the electrical level judging of output, S/PDIF signals are exported if having, if stopping output S/PDIF signals without if, so that automatically when S/PDIF interfaces do not have external equipment to insert or user selects to close, the output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
Description
Technical field
The present invention relates to audio ＆ video equipment, more particularly to a kind of set-top box signal output control circuit and set top box.
Background technology
As a kind of equipment for connecting television set and outside source, it can change into the data signal of compression set top box
Television content, and being shown in television set, its content received in addition to image that simulated television can provide, sound,
More it is that electronic program guides, internet webpage, captions etc. data content can be received, is widely used.
Generally, set top box can meet the needs of different user equipped with coaxial S/PDIF interfaces as audio-video interface, supply
User uses.And set top box is generally also equipped with other audio-video interfaces such as HDMI, RCA, YPbPr, user may choose other
Output of the interface as audio frequency and video.Now, although coaxial S/PDIF interfaces are not used, master chip exports S/ all the time
PDIF signals are simultaneously transmitted to S/PDIF signal processing circuits, and this power consumption for just significantly increasing set top box, generating need not
The waste of energy wanted.
The content of the invention
In view of this, it is necessary to do not use master chip output S/PDIF signals to cause to waste for above-mentioned S/PDIF interfaces
The problem of, there is provided a kind of set-top box signal output control circuit and set top box.
A kind of set-top box signal output control circuit provided by the invention, including：Interface status detection unit and signal
Control unit；Whether the Interface status detection unit detection S/PDIF interfaces have external equipment insertion, and according to whether have outer
Level corresponding to equipment insertion output is connect to signaling control unit, the signaling control unit according to the electrical level judging of reception whether
There is external equipment insertion, S/PDIF signals are exported if having, if the stopping output S/PDIF signals without if.
Preferably, the Interface status detection unit includes on-off circuit and comparator unit；The on-off circuit and letter
The connection of number control unit, receives the control of signaling control unit, set Interface status detection unit as autosensing mode or
Artificial setting pattern, the comparator unit connecting valve circuit, in autosensing mode, automatic detection S/PDIF interfaces are
No have an external equipment insertion, and according to whether there is level corresponding to external equipment insertion output, in manually setting pattern according to
Level corresponding to setting output.
Preferably, the comparator unit detects that S/PDIF interfaces have external equipment insertion in autosensing mode
When export high level, export low level when being inserted without external equipment；The comparator unit manually setting pattern when, if
Artificial setting does not export S/PDIF signals and then exports low level.
Preferably, the on-off circuit includes the first electronic switch and the second electronic switch, and the comparator unit includes
Comparator, first resistor, second resistance, 3rd resistor and the 4th resistance；Described first electronic switch one end connects high potential,
One end connects comparator negative phase end, the second electronic switch one end ground connection, other end connection comparator negative phase end, the comparison
Device negative phase end connects S/PDIF interfaces, and 3rd resistor one end, 3rd resistor other end connection high potential, the first resistor
One end is grounded, and other end connection second resistance, the second resistance other end connects the 4th resistance, and the connection of the 4th resistance other end is compared
Device output end, the comparator positive terminal are connected between first resistor and second resistance.
Preferably, the high potential is 5V, first resistor is 150 Europe, second resistance is 50 Europe, 3rd resistor be 150 Europe,
4th resistance is 5.1K Europe.
A kind of set top box, including S/PDIF interfaces and signal output control circuit, the signal output control circuit bag
Include：Interface status detection unit and signaling control unit；Whether the Interface status detection unit detection S/PDIF interfaces have
External equipment inserts, and according to whether has level corresponding to external equipment insertion output to signaling control unit, the signal control
Whether unit processed has external equipment insertion according to the electrical level judging of reception, S/PDIF signals is exported if having, if stopping without if
Export S/PDIF signals.
Preferably, the Interface status detection unit includes on-off circuit and comparator unit；The on-off circuit and letter
The connection of number control unit, receives the control of signaling control unit, set Interface status detection unit as autosensing mode or
Artificial setting pattern, the comparator unit connecting valve circuit, in autosensing mode, automatic detection S/PDIF interfaces are
No have an external equipment insertion, and according to whether there is level corresponding to external equipment insertion output, in manually setting pattern according to
Level corresponding to setting output.
Preferably, the comparator unit detects that S/PDIF interfaces have external equipment insertion in autosensing mode
When export high level, export low level when being inserted without external equipment；The comparator unit manually setting pattern when, if
Artificial setting does not export S/PDIF signals and then exports low level.
Preferably, the on-off circuit includes the first electronic switch and the second electronic switch, and the comparator unit includes
Comparator, first resistor, second resistance, 3rd resistor and the 4th resistance；Described first electronic switch one end connects high potential,
One end connects comparator negative phase end, the second electronic switch one end ground connection, other end connection comparator negative phase end, the comparison
Device negative phase end connects S/PDIF interfaces, and 3rd resistor one end, 3rd resistor other end connection high potential, the first resistor
One end is grounded, and other end connection second resistance, the second resistance other end connects the 4th resistance, and the connection of the 4th resistance other end is compared
Device output end, the comparator positive terminal are connected between first resistor and second resistance.
Preferably, the high potential is 5V, first resistor is 150 Europe, second resistance is 50 Europe, 3rd resistor be 150 Europe,
4th resistance is 5.1K Europe.
Whether set-top box signal output control circuit and set top box of the present invention, detection S/PDIF interfaces have external equipment to insert
Enter, according to level corresponding to detection output, whether external equipment insertion is had according to the electrical level judging of output, S/ is exported if having
PDIF signals, if without if stop output S/PDIF signals, so as to automatically S/PDIF interfaces do not have external equipment insert or
When user selects to close, the output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
Brief description of the drawings
Fig. 1 is the structure chart of the set-top box signal output control circuit in one embodiment；
Fig. 2 is the concrete structure diagram of the set-top box signal output control circuit in one embodiment.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Fig. 1 is the structure chart of the set-top box signal output control circuit in one embodiment, and Fig. 2 is in one embodiment
The concrete structure diagram of set-top box signal output control circuit, as depicted in figs. 1 and 2, the set-top box signal output control circuit bag
Include：Interface status detection unit 100 and signaling control unit 200.Interface status detection unit 100 detects S/PDIF interfaces
It is no to have external equipment insertion, and according to whether have level corresponding to external equipment insertion output to signaling control unit 200.Signal
Whether control unit 200 has external equipment insertion according to the electrical level judging of reception, exported if having S/PDIF signals (and transmit to
S/PDIF signal processing circuits), if the stopping output S/PDIF signals without if.
In this embodiment, Interface status detection unit 100 includes on-off circuit 110 and comparator unit 120.Switch electricity
Road 110 is connected with signaling control unit 200, receives the control of signaling control unit 200, setting Interface status detection unit 100
For autosensing mode or manually set pattern.The connecting valve circuit 110 of comparator unit 120, in autosensing mode
Whether automatic detection S/PDIF interfaces have external equipment insertion, and according to whether have level corresponding to external equipment insertion output；
Manually setting pattern when according to setting output corresponding to level.
Further, comparator unit 120 detects that S/PDIF interfaces have external equipment insertion in autosensing mode
When export high level, export low level when being inserted without external equipment.Comparator unit 120 manually setting pattern when, if
Artificial setting does not export S/PDIF signals and then exports low level.
Further, on-off circuit 110 includes the first electronic switch S1 and the second electronic switch S2.Comparator unit
120 include comparator 121, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4.First electronic switch
S1 one end connects high potential, one end connection negative phase end of comparator 121.Second electronic switch S2 one end is grounded, other end connection ratio
Compared with the negative phase end of device 121.The negative phase end of comparator 121 connection S/PDIF interfaces, and 3rd resistor R3 one end, 3rd resistor R3 are another
End connection high potential.First resistor R1 one end is grounded, other end connection second resistance R2, second resistance R2 other ends connection the 4th
Resistance R4, the 4th resistance R4 other ends connection output end of comparator 121.The positive terminal of comparator 121 be connected to first resistor R1 and
Between second resistance R2.During autosensing mode, the first electronic switch S1 and the second electronic switch S2 receive signal control list
The control of member 200 is off.When there is external equipment insertion, the negative phase end level of comparator 121 is low level, and positive terminal is
High level, comparator 121 export high level, and signaling control unit 200 judges there is external equipment insertion after detecting high level, defeated
Go out S/PDIF signals.When no external equipment inserts, the negative phase end of comparator 121 is high level, and positive terminal is low level, is compared
Device 121 exports low level, and signaling control unit 200 judges no external equipment insertion after detecting low level, then do not export S/
PDIF signals.During artificial setting pattern, the first electronic switch S1 closures, the second electronic switch S2 disconnects.The negative phase end of comparator 121
For high level, positive terminal is low level, and comparator 121 exports low level, and signaling control unit 200 detects after low level then not
Export S/PDIF signals, so allow for user can self-defined S/PDIF signals according to demand output, then it is unwanted when
Wait the output for closing S/PDIF signals always.So, just there is no external equipment insertion or user's choosing in S/PDIF interfaces automatically
When selecting closing, the output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
In a preferred embodiment, high potential 5V, first resistor R1 are 150 Europe, second resistance R2 is 50 Europe, the 3rd
Resistance R3 is 150 Europe, the 4th resistance R4 is 5.1K Europe.Comparator 120 is LM393M comparators.
The set-top box signal output control circuit, whether detection S/PDIF interfaces have external equipment insertion, defeated according to detecting
Go out corresponding level, whether external equipment insertion is had according to the electrical level judging of output, S/PDIF signals are exported if having, if not having
Then stop output S/PDIF signals, so that automatically when S/PDIF interfaces do not have external equipment to insert or user selects to close,
The output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
Meanwhile the present invention also provides a kind of set top box.The set top box includes S/PDIF interfaces and signal output control electricity
Road.As depicted in figs. 1 and 2, the signal output control circuit includes：Interface status detection unit 100 and signaling control unit
200.Interface status detection unit 100 detects whether S/PDIF interfaces have external equipment insertion, and according to whether has external equipment
Level corresponding to output is inserted to signaling control unit 200.It is outer whether signaling control unit 200 has according to the electrical level judging of reception
Equipment insertion is connect, S/PDIF signals (and transmitting to S/PDIF signal processing circuits) are exported if having, if the stopping output without if
S/PDIF signals.
In this embodiment, Interface status detection unit 100 includes on-off circuit 110 and comparator unit 120.Switch electricity
Road 110 is connected with signaling control unit 200, receives the control of signaling control unit 200, setting Interface status detection unit 100
For autosensing mode or manually set pattern.The connecting valve circuit 110 of comparator unit 120, in autosensing mode
Whether automatic detection S/PDIF interfaces have external equipment insertion, and according to whether have level corresponding to external equipment insertion output；
Manually setting pattern when according to setting output corresponding to level.
Further, comparator unit 120 detects that S/PDIF interfaces have external equipment insertion in autosensing mode
When export high level, export low level when being inserted without external equipment.Comparator unit 120 manually setting pattern when, if
Artificial setting does not export S/PDIF signals and then exports low level.
Further, on-off circuit 110 includes the first electronic switch S1 and the second electronic switch S2.Comparator unit
120 include comparator 121, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4.First electronic switch
S1 one end connects high potential, one end connection negative phase end of comparator 121.Second electronic switch S2 one end is grounded, other end connection ratio
Compared with the negative phase end of device 121.The negative phase end of comparator 121 connection S/PDIF interfaces, and 3rd resistor R3 one end, 3rd resistor R3 are another
End connection high potential.First resistor R1 one end is grounded, other end connection second resistance R2, second resistance R2 other ends connection the 4th
Resistance R4, the 4th resistance R4 other ends connection output end of comparator 121.The positive terminal of comparator 121 be connected to first resistor R1 and
Between second resistance R2.During autosensing mode, the first electronic switch S1 and the second electronic switch S2 receive signal control list
The control of member 200 is off.When there is external equipment insertion, the negative phase end level of comparator 121 is low level, and positive terminal is
High level, comparator 121 export high level, and signaling control unit 200 judges there is external equipment insertion after detecting high level, defeated
Go out S/PDIF signals.When no external equipment inserts, the negative phase end of comparator 121 is high level, and positive terminal is low level, is compared
Device 121 exports low level, and signaling control unit 200 judges no external equipment insertion after detecting low level, then do not export S/
PDIF signals.During artificial setting pattern, the first electronic switch S1 closures, the second electronic switch S2 disconnects.The negative phase end of comparator 121
For high level, positive terminal is low level, and comparator 121 exports low level, and signaling control unit 200 detects after low level then not
Export S/PDIF signals, so allow for user can self-defined S/PDIF signals according to demand output, then it is unwanted when
Wait the output for closing S/PDIF signals always.So, just there is no external equipment insertion or user's choosing in S/PDIF interfaces automatically
When selecting closing, the output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
In a preferred embodiment, high potential 5V, first resistor R1 are 150 Europe, second resistance R2 is 50 Europe, the 3rd
Resistance R3 is 150 Europe, the 4th resistance R4 is 5.1K Europe.Comparator 120 is LM393M comparators.
The set top box, whether signal output control circuit detection S/PDIF interfaces have external equipment insertion, defeated according to detecting
Go out corresponding level, whether external equipment insertion is had according to the electrical level judging of output, S/PDIF signals are exported if having, if not having
Then stop output S/PDIF signals, so that automatically when S/PDIF interfaces do not have external equipment to insert or user selects to close,
The output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
Whether set-top box signal output control circuit and set top box of the present invention, detection S/PDIF interfaces have external equipment to insert
Enter, according to level corresponding to detection output, whether external equipment insertion is had according to the electrical level judging of output, S/ is exported if having
PDIF signals, if without if stop output S/PDIF signals, so as to automatically S/PDIF interfaces do not have external equipment insert or
When user selects to close, the output of S/PDIF signals is closed, the power consumption for reducing set top box avoids unnecessary waste of energy.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.
Claims (8)
- A kind of 1. set-top box signal output control circuit, it is characterised in that including：Interface status detection unit and signal control Unit；Whether the Interface status detection unit detection S/PDIF interfaces have external equipment insertion, and according to whether have external set To signaling control unit, it is outer whether the signaling control unit has level corresponding to standby insertion output according to the electrical level judging of reception Equipment insertion is connect, S/PDIF signals are exported if having, if the stopping output S/PDIF signals without if；The Interface status detection is single Member includes on-off circuit and comparator unit；The on-off circuit is connected with signaling control unit, receives signaling control unit Control, set Interface status detection unit and pattern is set as autosensing mode or manually, the comparator unit connection is opened Powered-down road, in autosensing mode, whether automatic detection S/PDIF interfaces have external equipment insertion, and according to whether have external Equipment insertion output corresponding to level, manually setting pattern when according to setting output corresponding to level.
- 2. set-top box signal output control circuit according to claim 1, it is characterised in that the comparator unit is certainly During dynamic detection pattern, detect and export high level when S/PDIF interfaces have external equipment insertion, it is defeated when being inserted without external equipment Go out low level；The comparator unit exports low in manually setting pattern if artificial setting does not export S/PDIF signals Level.
- 3. set-top box signal output control circuit according to claim 2, it is characterised in that the on-off circuit includes the One electronic switch and the second electronic switch, the comparator unit include comparator, first resistor, second resistance, 3rd resistor And the 4th resistance；Described first electronic switch one end connects high potential, one end connection comparator negative phase end, second electronics One end ground connection, other end connection comparator negative phase end are switched, the comparator negative phase end connects S/PDIF interfaces, and the 3rd electricity One end, 3rd resistor other end connection high potential are hindered, described first resistor one end is grounded, other end connection second resistance, and second The resistance other end connects the 4th resistance, the 4th resistance other end connection comparator output terminal, and the comparator positive terminal is connected to Between first resistor and second resistance.
- 4. set-top box signal output control circuit according to claim 3, it is characterised in that the high potential is 5V, the One resistance is 150 Europe, second resistance is 50 Europe, 3rd resistor is 150 Europe, the 4th resistance is 5.1K Europe.
- 5. a kind of set top box, including S/PDIF interfaces and signal output control circuit, it is characterised in that the signal output control Circuit processed includes：Interface status detection unit and signaling control unit；The Interface status detection unit detection S/PDIF connects Whether mouth has external equipment insertion, and according to whether has level corresponding to external equipment insertion output to signaling control unit, institute State whether signaling control unit has external equipment insertion according to the electrical level judging of reception, S/PDIF signals are exported if having, if not having Have and then stop output S/PDIF signals；The Interface status detection unit includes on-off circuit and comparator unit；The switch Circuit is connected with signaling control unit, receives the control of signaling control unit, sets Interface status detection unit as automatic detection Pattern manually sets pattern, the comparator unit connecting valve circuit, the automatic detection S/ in autosensing mode Whether PDIF interfaces have external equipment insertion, and according to whether level corresponding to having external equipment insertion output, is manually setting During pattern according to setting output corresponding to level.
- 6. set top box according to claim 5, it is characterised in that the comparator unit is in autosensing mode, inspection Measure S/PDIF interfaces and export high level when having external equipment insertion, low level is exported when being inserted without external equipment；The ratio Compared with device unit in manually setting pattern, low level is exported if artificial setting does not export S/PDIF signals.
- 7. set top box according to claim 6, it is characterised in that the on-off circuit includes the first electronic switch and second Electronic switch, the comparator unit include comparator, first resistor, second resistance, 3rd resistor and the 4th resistance；It is described First electronic switch one end connects high potential, and one end connection comparator negative phase end, described second electronic switch one end is grounded, another End connection comparator negative phase end, the comparator negative phase end connection S/PDIF interfaces, and 3rd resistor one end, 3rd resistor are another One end connects high potential, first resistor one end ground connection, other end connection second resistance, second resistance other end connection the 4th Resistance, the 4th resistance other end connection comparator output terminal, the comparator positive terminal are connected to first resistor and second resistance Between.
- 8. set top box according to claim 7, it is characterised in that the high potential is 5V, and first resistor is 150 Europe, the Two resistance are 50 Europe, 3rd resistor is 150 Europe, the 4th resistance is 5.1K Europe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834838.0A CN104539990B (en) | 2014-12-29 | 2014-12-29 | Set-top box signal output control circuit and set top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834838.0A CN104539990B (en) | 2014-12-29 | 2014-12-29 | Set-top box signal output control circuit and set top box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104539990A CN104539990A (en) | 2015-04-22 |
| CN104539990B true CN104539990B (en) | 2017-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410834838.0A Expired - Fee Related CN104539990B (en) | 2014-12-29 | 2014-12-29 | Set-top box signal output control circuit and set top box |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105208438B (en) * | 2015-09-24 | 2018-09-25 | 深圳市九洲电器有限公司 | Function switch circuit and gateway formula set-top box |
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|---|---|---|---|---|
| CN200944652Y (en) * | 2006-08-25 | 2007-09-05 | 海信集团有限公司 | Circuit and television for detecting output of the availability of interface signal |
| CN101959003A (en) * | 2009-07-16 | 2011-01-26 | 深圳市九洲电器有限公司 | SCART function selection switching control signal processing circuit and method |
| CN202121700U (en) * | 2011-06-30 | 2012-01-18 | 苏州冠捷科技有限公司 | Automatic signal source detection circuit for television set |
| CN202841486U (en) * | 2012-09-03 | 2013-03-27 | 广州市拓品电子科技有限公司 | Automatic switch device based on digital audio signals and used for audio device |
| CN202998373U (en) * | 2012-12-18 | 2013-06-12 | 罗艳 | Audio and video equipment intelligent power supply management system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2589065A1 (en) * | 2004-10-27 | 2006-05-04 | Superna Limited | Networked device control architecture |
-
2014
- 2014-12-29 CN CN201410834838.0A patent/CN104539990B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200944652Y (en) * | 2006-08-25 | 2007-09-05 | 海信集团有限公司 | Circuit and television for detecting output of the availability of interface signal |
| CN101959003A (en) * | 2009-07-16 | 2011-01-26 | 深圳市九洲电器有限公司 | SCART function selection switching control signal processing circuit and method |
| CN202121700U (en) * | 2011-06-30 | 2012-01-18 | 苏州冠捷科技有限公司 | Automatic signal source detection circuit for television set |
| CN202841486U (en) * | 2012-09-03 | 2013-03-27 | 广州市拓品电子科技有限公司 | Automatic switch device based on digital audio signals and used for audio device |
| CN202998373U (en) * | 2012-12-18 | 2013-06-12 | 罗艳 | Audio and video equipment intelligent power supply management system |
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| CN104539990A (en) | 2015-04-22 |
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Granted publication date: 20171229 Termination date: 20201229 |