CN2119053U

CN2119053U - Sound controller for microphone and earphone of intercom

Info

Publication number: CN2119053U
Application number: CN 92207481
Authority: CN
Inventors: 周颖平; 刘海涛; 殷胜; 原群; 李书旺
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-21
Filing date: 1992-04-21
Publication date: 1992-10-14

Abstract

The utility model relates to a sound controller for a microphone and an earphone of a wireless intercom, which is suitable for simplex and quasi-duplex single machine use. The utility model replaces the PTT key operation of the original intercom with a voice control, and a microphone/ear speaker bilateral transducer which is plugged in people's auricle can accomplish the acoustoelectric and electroacoustic bilateral switching. A standard receiving and sending signal two-four wire converting circuit can accomplish a four-two wire converting between an intercom sending MIC, receiving SP and the bilateral transducer. A sound controlled electronic switching circuit is controlled by voice and can send the intercom PTT DC control signal into the ground, and user's voice can be emitted by an intercom modulation circuit. The utility model has the advantage of simple structure, which can completely release the both hands and can not be affected by environmental noise.

Description

Sound controller for microphone and earphone of intercom

The utility model relates to a kind of telecommunication transmitting device, relates to a kind of Mike/earphone acoustic control device of wireless interspeaker or rather.

Existing wireless interspeaker all contains SP and MIC standard jacks, but external loudspeaker and microphone; The PTT button is arranged, post a letter when pressing, collect mail when unclamping, feel use inconvenience owing to not liberating both hands.

The purpose of this utility model is a kind of intercom Mike/earphone acoustic control device that can free both hands when using intercom fully of design, when posting a letter, the acoustic control device receives voice signal and starts the intercom transmitting circuit automatically and the MIC of intercom passed in speech, is equivalent to press originally the operation of PTT key; During the collection of letters, the acoustic control device can not receive voice signal, and intercom SP sends the other side's voice signal, is equivalent to unclamp originally the operation of PTT key.

The utility model is made up of three functional parts: bidrectional transducer MIC/SP(Mike/earphone), and plug is finished the bi-directional conversion of sound-electricity, electricity-sound in user's auricle, a pair of lead-in wire of not only having posted a letter but also having collected mail is arranged; Standard transceiver two-four line change-over circuits are finished MIC, the SP that is used to collect mail and the conversion of four-two wires between the bidrectional transducer pair of lead wires that intercom is used to post a letter; Sound controling switch circuit when the user posts a letter, is subjected to speech control that intercom PTT dc control signal is gone into ground, and voiceband user send the emission of intercom modulation circuit.

Describe technology of the present utility model in detail below in conjunction with the embodiment accompanying drawing.

Accompanying drawing 1 is the MIC/SP acoustic control device electrical schematic diagram of intercom.

Accompanying drawing 2 is the MIC/SP acoustic control device of intercom and the connection diagram of intercom.

Referring to accompanying drawing 1, frame of broken lines 1 is the MIC/SP bidrectional transducer, and frame 2 is standard transceiver two-four line change-over circuits, and frame 3 is the acoustic control electronic switch.

MIC/SP bidrectional transducer shown in the frame 1, it is a kind of common electro-acoustic element, the piezo ceramic element that contains two different direction of vibration, finish acoustic-electric conversion and electroacoustic conversion respectively, therefore existing microphone function has ear-phone function again, when making microphone, acoustoelectric element impression be through the vibration of brains muscle, bone conduction by people's phonatory organ to people ear, thereby can eliminate the ambient noise that conventional microphone is introduced effectively, can adopt common headphones in the enforcement, pair of lead wires is arranged to functional part 2, wherein a lead-in wire is a ground wire.

Standard transceiver two-four line change-over circuits shown in the frame 2, the electronics differential system that is connected into by transmit amplifier A2, reception amplifier A1, resistance R 2-R8 constitutes, and finishes the function of transceiver hybrid coil, makes the sending and receiving of acoustic control device adopt couple of conductor.Embodiment A 1, A2 are the backward crossover stream amplifiers, adopt dual operational amplifier 4558.

When posting a letter, the MIC/SP bidrectional transducer is experienced voice signal, one the tunnel delivers to transmit amplifier A2 through resistance R 6, another road is through resistance R 4, R3 delivers to reception amplifier A1, because the output of A2 is also through resistance R 7, R5, R2 adds to A1, and the process R4 next with bidrectional transducer, 180 ° of the positive good jobs of the same signal phase of R3, both offset, thereby the voice signal that only has transmit amplifier A2 output to have the MIC/SP bidrectional transducer to send, through resistance R 8, capacitor C 2, plug 22 are delivered to intercom MIC mouth, under sound controling switch circuit control, voice signal is modulated, emission, resistance R 8 is used to regulate the work frequency deviation of emission.

During the collection of letters, the other side's speech by intercom SP mouth is through plug 21, capacitor C 1 is coupled to two-four line change-over circuits 2, voice signal one tunnel is delivered to reception amplifier A1 through resistance R 2, and another road adds to the input of A2 through resistance R 5, because the output of A1 also adds to the input of A2 through resistance R 6, with 180 ° of the positive good jobs of same signal of A1 output, both offset, thereby the A2 no-output, and the MIC/SP bidrectional transducer receives the other side's speech of A1 output.

Above-mentioned electronics differential system is finished the conversion of two-four lines, and the acoustic control device is towards a side of intercom, and a pair of line is received, and a pair of line is sent out (ground wire altogether); Towards a side of MIC/SP bidrectional transducer, a pair of line is not only sent out but also receive.Resistance R 2, R3 decision A1 gain, resistance R 5, R6, R7 decision A2 gain, wherein R5, R6 also determine to receive/rejection ratio, the ten termination fixed potential VA of transport and placing device A1, A2, take from the resistor voltage divider circuit of A4 end in the frame 3, A1, A2 use single supply laminated cell 9V.

Audio-switch shown in the frame 3, by operational amplifier A 3, A4(double operational 4558), time-base circuit NE555, resistance R W, R9-R15, capacitor C 3-C6, diode D1, D2, triode T1 and analog switch K constitute, be connected on after the transmit amplifier A2, A3 is common AC amplifier, D1, D2 are the audio frequency rectifier, RW, C4 constitute the RC integrating circuit, be used to adjust the acoustic control response time, A4 is connected into voltage comparator, the NE555 time-base circuit is connected into monostable flipflop, analog switch K is equivalent to the PTT button of intercom, and R15 is the PTT load resistance.

During the collection of letters, A2, A3 no-output, A4 exports high potential, and transistor T 1 ends, and it is low level that monostable flipflop keeps stable state, and analog switch K disconnects, and is equivalent to unclamp the PTT button, and the user receives the other side's speech, and the acoustic control device is in information receiving state.

When posting a letter, the voiceband user signal of A2 output, one the tunnel through R8, C2 etc. directly send the intercom modulation, another road is coupled to A3 through capacitor C 6 and amplifies, through D1, the D2 rectification obtains the direct voltage of a positive polarity, RW, the effect of C4 is time-delay, present embodiment is adjusted into 5-10ms to the acoustic control response time, and when voltage surpassed VA on C4, the A4 output state flip was a low level, the T1 conducting, trigger monostable flipflop output high level transient state, analog switch K closure is connected intercom PTT key circuit, the PTT dc control signal is gone into ground, be equivalent to press the operation of intercom PTT key.The acoustic control device is in the state of posting a letter, the time of NE555 output high level transient state is by T1, R14, C5 decision, present embodiment is adjusted into 20ms, as long as the user talks always, and when speech is no more than 20ms at interval, A4 output just remains low level, the T1 conducting, C5 is in discharge condition always, and NE555 also exports high level transient state always, intercom just keeps the state of posting a letter, as long as the user rings off more than the 20ms, this moment, the last charging voltage of C5 resetted monostable flipflop because T1 ends, disconnect K, intercom stops to post a letter.

Referring to accompanying drawing 2, A is a wireless interspeaker, and B is that acoustic control device, C are earphone, is that four lines are connected (common ground wire is arranged) between A and B, and

plug

21,22 inserts respectively in the SP, MIC jack of intercom A, and for the two wires is connected, wherein one is common ground wire between B and C.

What the utility model adopted is standard transceiver two-four line change-over circuits, except can adopting the electronics differential system, also can adopt the circuit and the integrated chip of other type, and A1-A4 also can adopt four-operational amplifier such as RM324 etc.

The wireless talkback unit that the utility model is suitable for single worker, quasi-duplex uses, and do not change the original performance and the parameter of intercom, can be made into the appearance structure of similar beeper, carry with intercom, the earphone plug is in auricle, post a letter, collect mail by language control intercom, liberated both hands fully, very posted a letter naturally, collect mail, and can eliminate influence of environmental noise, in the king-sized operation of noise workshop, also can use, promotional value and application prospect are arranged.

Claims

1, a kind of Mike of intercom/earphone acoustic control device is characterized in that comprising:

1) has and finish Mike/earphone bidrectional transducer that acoustic-electric conversion and electroacoustic are changed, a pair of lead-in wire of not only having posted a letter but also having collected mail is arranged;

2) MIC that is used to post a letter that finishes intercom is arranged, standard transceiver two-four line change-over circuits of four-two wires conversion between SP that is used to collect mail and described Mike/earphone bidrectional transducer pair of lead wires;

3) there is the voice signal that receives described MIC/SP bidrectional transducer output to control the acoustic control electronic switching circuit of intercom PTT button ground connection.

2, the Mike of a kind of intercom according to claim 1/earphone acoustic control device is characterized in that described MIC/SP bidrectional transducer is a common headphones.

3, the Mike of a kind of intercom according to claim 1/earphone acoustic control device is characterized in that described standard transceiver two-four line change-over circuits are by transmit amplifier, the electronics differential system that reception amplifier, resistance are connected into.

4, according to the Mike/earphone acoustic control device of claim 1 or 3 described a kind of intercoms, it is characterized in that described acoustic control electronic switching circuit is connected on after described two-four line change-over circuit reception amplifiers, is linked in sequence and is formed by backward crossover stream amplifier, diode audio frequency rectification circuit, RC integrating circuit, voltage comparator, triode, monostable flipflop, PTT analog switch.