CN2325945Y - Infrared stereophonic head phone for TV set - Google Patents

Abstract

The utility model relates to an infrared stereophonic head phone for a TV which comprises a switch 1, a volume button 2, a main body 3, a cell cover 4, an earphone bracket 5 and a sponge cover 6. The utility model is characterized in that the left and the right bodies are provided with an infra-red receiving window 7; the inner of the left and the right bodies are provided with an infra-red receiving circuit 8 which is respectively used for receiving left and right audio signals; the infra-red receiving circuit 8 is matched with an infrared transmittance circuit 9 which is arranged in the TV. The utility model can not interfere with the radio and broadcast. The utility model has the characteristics of simple structure, reliable performance, low cost and easy application.

Description

Used as television infrared ray stereophone

The utility model relates to a kind of earphone, particularly relates to a kind of used as television infrared ray stereophone.

In the information age of today, TV has become one of most important medium of information propagation.People have accounted for critical role from the information that video screen obtains, people can have such sensation, in in the dead of night, watch TV programme, because of the study of being afraid of to disturb household's rest or influencing children, have to volume is reduced, and the appreciation effect is had a greatly reduced quality, and can not appreciate program well because of environment is noisy sometimes.The best method that overcomes the above problems is exactly to be equipped with earphone to television set.People have brought into use the cable TV earphone before for many years for this reason, and wired earphone commonly used in the past uses inconvenience because of the connection that holding wire is arranged causes, and inconvenient several people uses simultaneously.In order to overcome above-mentioned defective, people have invented the used as television wireless headset.Use wireless headset that multiple mode is arranged, the Chang Yong mode that radio wave transmission is arranged wherein, this mode be because of radio broadcasting communication mutual interference mutually easy and on every side, even all can the root mutual interference when using simultaneously between neighbours, so should not advocate, promote.

The purpose of this utility model is to provide a kind of can not cause interference and simple in structure, dependable performance, cheap, easy to implement used as television infrared ray stereophone to wireless telecommunications and broadcasting.

The purpose of this utility model realizes as follows:

Used as television infrared ray stereophone comprises switch 1, sound volume button 2, fuselage 3, battery cover 4, ear frame 5 and sponge cover 6, it is characterized in that on left and right fuselage, being provided with infrared ray receiver window 7, be provided with in the left and right fuselage and be respectively applied for the infrared radiation receiving circuit 8 that receives the left and right sound channels audio signal, infrared radiation receiving circuit 8 matches with infrared transmitter 9 in being contained in television set.

Described infrared radiation receiving circuit 8 comprises left and right sound channels frequency- selective network 82,83, frequency discriminator 84,85, low discharging circuit 86,87 and the loudspeaker 88,89 that infrared ray receives amplifying circuit 81 and is attached thereto.

Described infrared transmitter 9 comprises the left and right sound channels audio frequency input circuit 91,92 that links to each other with the television set main circuit, the modulator 93,94 that links to each other with foregoing circuit, infrared transmitter 95,96, power supply 97 and central processing unit control switch 98.

Described infrared ray receiver window 7 is made by light-passing plastic.

Described infrared ray receives amplifying circuit 81 and is made up of four infrared receiver tube D1, D2, D3, D4 and triode Q1, Q2, Q3; Frequency- selective network 82,83 comprise capacitor C 7, C40, C41, C42, inductance L 5 and capacitor C 24, C43, C44,, C45, inductance L 7, L8; Frequency discriminator 84,85 comprises capacitor C 16, inductance L 2, resistance R 14, chip IC 1 and capacitor C 32, inductance L 4, resistance R 27, chip IC 2; Low discharging circuit 86,87 is included in chip IC 1, the IC2, and loudspeaker 88,89 are connected to the output that infrared ray receives amplifying circuit 81.

Described left and right audio frequency input circuit 91,92 comprises emitter follower Q01, Q10 and triode Q03, Q07; Modulator 93,94 adopts integrated circuit die I C01, IC02; Infrared transmitter 95,96 comprises triode Q04, Q05, Q08, Q09 and infrared diode LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12.

Operation principle of the present utility model is will be modulated into the FM signal of different frequency by the left and right acoustic channels audio signal that the television main central layer is sent here by infrared transmitter 9, by the emission of two-way infrared diode, realizes the wireless stereo emission.After receiving terminal then receives by the infrared receiver tube that is contained in the infrared radiation receiving circuit 8 in the earphone fuselage, FM signal is delivered to the demodulator of frequency separately respectively, demodulate the left and right acoustic channels audio signal.

The utility model has solved the problem that Radio earphone is easy to generate the phase mutual interference well.Because it is outdoor that infrared waves can not spread out of, therefore can not cause interference to communication on every side, broadcasting etc., the utility model circuit is simple in addition, dependable performance, and cheap, therefore have practical and popularizing value.

Fig. 1 is the utility model structural representation.

Fig. 2 is the infrared transmitter block diagram.

Fig. 3 is the infrared transmitter electrical schematic diagram.

Fig. 4 is an infrared ray line receiving circuit block diagram.

Fig. 5 is the infrared radiation receiving circuit electrical schematic diagram.

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in Figure 1, used as television infrared ray stereophone comprises switch 1, sound volume button 2, fuselage 3, battery cover 4, ear frame 5 and sponge cover 6, and said structure and existing earphone are roughly the same.Be provided with infrared ray receiver window 7 on left and right fuselage, be provided with in the left and right fuselage and be respectively applied for the infrared radiation receiving circuit 8 that receives the left and right sound channels audio signal, infrared radiation receiving circuit 8 matches with infrared transmitter 9 in being contained in television set.Above-mentioned infrared ray receiver window 7 is made by light-passing plastic, so that the FM signal that infrared transmitter 9 sends can be received smoothly by infrared radiation receiving circuit 8.Infrared radiation receiving circuit 8 is made wiring board and is contained in the fuselage, and infrared transmitter 9 is made wiring board and is contained in the television set.This earphone is controlled with mechanical switch 1 with No. 5 powered battery of two joints.When switch connection, luminous tube D5 is luminous, and indication circuit is in running order.

Described infrared radiation receiving circuit 8 as shown in Figure 4, it comprises left and right sound channels frequency- selective network 82,83, frequency discriminator 84,85, low discharging circuit 86,87 and the loudspeaker 88,89 that infrared ray receives amplifying circuit 81 and is attached thereto.Above-mentioned infrared ray receives amplifying circuit 81 and is made up of four infrared receiver tube D1, D2, D3, D4 and triode Q1, Q2, Q3; Frequency- selective network 82,83 comprises capacitor C 7, C40, C41, C42, inductance L 5 and capacitor C 24, C43, C44, C45, inductance L 7, L8; Frequency discriminator 84,85 comprises capacitor C 16, inductance L 2, resistance R 14, chip IC 1 and capacitor C 32, inductance L 4, resistance R 27, chip IC 2; Low discharging circuit 86,87 is included in chip IC 1, the IC2, and loudspeaker 88,89 are connected to the output that infrared ray receives amplifying circuit 81.Its circuit theory as shown in Figure 5, after four infrared receiver tube D1～D4 receive the FM signal of infrared transmitter 9 emissions, after triode Q1, Q2, Q3 input coupling are amplified, isolate the FM signal of left and right sound channels by frequency- selective network 82,83 separately.After the FM signal of left and right sound channels is amplified through Q4, Q5 and Q6, Q7 respectively, carry out frequency discrimination and low putting by frequency discriminator 84,85 and low discharging circuit 86,87 after, export the left and right sound channels signal respectively to loudspeaker 88,89, volume is regulated by potentiometer VR1.

Described infrared transmitter 9 as shown in Figure 2, it comprises the left and right sound channels audio frequency input circuit 91,92 that links to each other with the television set main circuit, the modulator 93,94 that links to each other with foregoing circuit, infrared transmitter 95,96, power supply 97 and central processing unit control switch 98.Above-mentioned left and right audio frequency input circuit 91,92 comprises emitter follower Q01, Q10 and triode Q03, Q07; Modulator 93,94 adopts integrated circuit die I C01, IC02; Infrared transmitter 95,96 comprises triode Q04, Q05, Q08, Q09 and infrared diode LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12.Its circuit theory as shown in Figure 3, wiring board interface P01 is connected to the television main central layer, its 1 pin connects the control switch signal, 2 pin earth connections, 3 pin connect+the 12V power supply, 4 pin connect left channel audio signal, 5 pin connect right channel audio signal, 6 pin switch through platform moment noise reduction.Wiring board interface P01 the 3rd pin provides+the 12V direct current, and one the tunnel delivers to infrared emission tube LED1～LED12 place, the power supply during as infrared.Another road process resistance R 29, R46, three utmost point Q06, after the voltage regulation filterings such as diode D01 and capacitor C 26, C27, output+8V direct current is supplied with integrated circuit die I C01, IC022 and other audio signal processing circuit.The left and right sides audio signal that 4,5 pin of wiring board interface P1 are sent here, respectively through amplifying by Q03, Q07 behind carried as side-arm device Q01, the Q10, signal after will amplifying is then sent into the modulator 93,94 that respectively is in and is carried out frequency modulation, and modulator adopts the two little power consumption phase-locked loop intergrated circuit of identical CMOS MCI4046BCT.Adjust and launch by triode Q04, Q05 and infrared diode LED1～LED6 after potentiometer VR01 is transferred to 210KHZ with the modulation frequency of L channel.Adjust and launch by triode Q08, Q09 and infrared diode LED7～LED12 after potentiometer VR02 is transferred to 355KHZ with the modulation frequency of R channel.When not using Infrared earphone, the main frame central layer is sent a high level signal here by 1 pin of interface P01 and is made triode Q02 conducting ,+8V no-output, thus the modulator outage is not worked, infrared emission tube ends.When using, 1 pin of interface P01 is a low level, and triode Q02 ends, normal output+8V voltage, circuit operate as normal.When using Infrared earphone, for the noise of moment of eliminating television set in the converted channel process, 6 pin in the interface have a control signal, in turntable moment, there is a high level to make triode Q11, Q12 conducting,, thereby reaches moment noise elimination purpose the interference signal shorted to earth of moment.

Claims (6)

1, a kind of used as television infrared ray stereophone, comprise switch (1), sound volume button (2), fuselage (3), battery cover (4), ear frame (5) and sponge cover (6), it is characterized in that on left and right fuselage, being provided with infrared ray receiver window (7), be provided with in the left and right fuselage and be respectively applied for the infrared radiation receiving circuit (8) that receives the left and right sound channels audio signal, infrared radiation receiving circuit (8) matches with infrared transmitter (9) in being contained in television set.

2, used as television infrared ray stereophone according to claim 1, it is characterized in that described infrared radiation receiving circuit (8) comprises left and right sound channels frequency-selective network (82), (83) that infrared ray receives amplifying circuit (81) and is attached thereto, frequency discriminator (84), (85), low discharging circuit (86), (87) and loudspeaker (88), (89).

3, used as television infrared ray stereophone according to claim 1, it is characterized in that described infrared transmitter (9) comprises left and right sound channels audio frequency input circuit (91), (92) that link to each other with the television set main circuit, the modulator that links to each other with foregoing circuit (93), (94), infrared transmitter (95), (96), power supply (97) and central processing unit control switch (98).

4, used as television infrared ray stereophone according to claim 1 is characterized in that described infrared ray receiver window (7) made by light-passing plastic.

5, used as television infrared ray stereophone according to claim 2 is characterized in that described infrared ray receives amplifying circuit (81) and is made up of four infrared receiver tube D1, D2, D3, D4 and triode Q1, Q2, Q3; Frequency-selective network (82), (83) comprise capacitor C 7, C40, C41, C42, inductance L 5 and capacitor C 24, C43, C44,, C45, inductance L 7, L8; Frequency discriminator (84), (85) comprise capacitor C 16, inductance L 2, resistance R 14, chip IC 1 and capacitor C 32, inductance L 4, resistance R 27, chip IC 2; Low discharging circuit (86), (87) are included in chip IC 1, the IC2, and loudspeaker (88), (89) are connected to the output that infrared ray receives amplifying circuit (81).

6, used as television infrared ray stereophone according to claim 3 is characterized in that described left and right audio frequency input circuit (91), (92) comprise emitter follower Q01, Q10 and triode Q03, Q07; Integrated circuit die I C01, IC02 are adopted in modulator (93), (94); Infrared transmitter (95), (96) comprise triode Q04, Q05, Q08, Q09 and infrared diode LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12.

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