CN201323726Y

CN201323726Y - Vehicle-mounted audio device with wireless electric megaphone

Info

Publication number: CN201323726Y
Application number: CNU200820223198XU
Authority: CN
Inventors: 王文华
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-05
Filing date: 2008-12-05
Publication date: 2009-10-07
Anticipated expiration: 2018-12-05

Abstract

The utility model discloses a vehicle-mounted audio device with a wireless electric megaphone, which comprises an electric megaphone and an audio device. The electric megaphone is provided with a transmitter; the audio device is provided with a receiver and an antenna; and the transmitter and the receiver are connected with signals through the antenna. Because the receiver and the transmitter are used in the vehicle-mounted audio device and the receiver of the electric megaphone is provided with an automatic switching circuit of power amplification power; when the signal is received, the power supply of the receiver automatically starts; and when the signal is not received, the power supply of the receiver automatically shuts down. The receiver is provided with an automatic audio frequency conversion circuit, and when the signal is received, the automatic audio signal can be automatically converted to the receiver of the electric megaphone to output the audio signal. Because the transmitter and the receiver of the electric megaphone adopt the frequency modulation mode, and the oscillator of the transmitter adopts the crystal and the frequency doubling amplifier, the utility model has the advantages of wide frequency response, high fidelity and clear speech. Because the transmitter of the electric megaphone adopts the wireless transmission, the utility model can be conveniently and flexibly used, and is in particular applicable to various buses, station wagons and touring vehicles.

Description

Vehicular sound equipment with wireless megaphone

Technical field

The utility model relates to on-vehicle acoustic apparatus, particularly with the vehicular sound equipment of wireless megaphone.

Background technology

The use of the megaphone of present various vehicles, especially bus, station wagon and touring car, used megaphone all are to adopt wired connection.

Because of being subjected to the restriction of microphone connecting line, when ticket seller or the busy need of waiter are informed all passengers, then must get back to its dedicated seat, propaganda directed to communicate with cable microphone again; The vehicle that has then is connected with the line microphone and all installs, and says by ticket seller or waiter's mouth entirely and mouthful cries out, and brings very big inconvenience to ticket seller or waiter.

Summary of the invention

The purpose of this utility model is to provide the vehicular sound equipment with wireless megaphone, can make ticket seller or waiter can be in vehicle at random the direction all passengers propaganda directed to communicate, very convenient.

The technical solution of the utility model is as follows:

Vehicular sound equipment with wireless megaphone is characterized in that: comprise megaphone that is provided with transmitter and the sound equipment that is provided with receiver, antenna, described transmitter and receiver connects signal by antenna.

Described transmitter comprises microphone, microphone amplifier, local oscillation and octamonic amplifier, amplifier, described microphone, microphone amplifier, local oscillation and octamonic amplifier, amplifier are connected successively, and described microphone amplifier, local oscillation and octamonic amplifier, amplifier all are connected with power supply.

Described receiver comprises megaphone receiver, audio frequency automatic switch, amplifier power supply automatic switch, described megaphone receiver is connected with audio frequency automatic switch, amplifier power supply automatic switch respectively, and described megaphone receiver, audio frequency automatic switch, amplifier power supply automatic switch all are connected with power supply.

The local oscillation of described transmitter and the oscillator of octamonic amplifier adopt variable capacitance diode.

The utility model also is provided with the invisible antenna that uses for stereo sets such as broadcast receiver, VCD, DVD, is composed in series successively by antenna, impedance conversion and frequency-selector, signal amplifier and adapter, and signal amplifier connects power supply.Antenna adopts rectangular copper wire to make, and be embedded in the panel of stereo set, comprise when opening broadcast receiver, power supply inserts signal amplifier, amplifier is in running order: antenna receives signal, send into impedance transformer and carry out impedance conversion and frequency-selecting, signal is decontroled the signal of device after with frequency-selecting and is amplified, and adapter carries out impedance matching to signal amplifier and back level input.

Operation principle of the present utility model is as follows:

Transmitter of the present utility model uses the 3V DC power supply, press mains switch, power supply indicator is bright, transmitter is in running order: microphone receives ticket seller or waiter's voice, microphone amplifier amplifies voice signal, and microphone amplifier adopts constant current to amplify, therefore, the reduction of cell voltage can not make the sound of megaphone diminish; In local oscillation and octamonic amplifier circuit, use the crystal oscillator working frequency stable, make the more stable work of transmitter reliable; In the oscillator of transmitter, use variable capacitance diode to carry out voice and modulate and in amplifier, use octamonic amplifier, thereby obtain the maximum frequency deviation of modulation, amplifier will amplify through the high-frequency signal of ovennodulation, and delivers to antenna, by antenna signal is sent again;

Receiver of the present utility model is to insert the audio frequency automatic switch between the preamplifier of various sound equipments and power amplifier, the megaphone receiver receives the signal that emitter sends, the audio signal that the audio frequency automatic switch will be sent into power amplifier is transformed into the audio signal that the megaphone receiver is exported automatically, simultaneously, the amplifier power supply automatic switch is opened power amplifier power supply automatically, power amplifier carries out power amplification with signal, and delivers to loud speaker.

Advantage of the present utility model:

1, the utility model can make megaphone realize wireless penetration by the introducing of Receiver And Transmitter; On the megaphone receiver, be provided with the amplifier power supply automatic switching circuit, when receiving signal, open receiver power supply automatically; When not receiving signal, close receiver power supply automatically; On receiver, be provided with the audio frequency automatic switching circuit, when receiving signal, automatically audio signal be transformed into the audio signal of megaphone receiver output;

2, because the megaphone transmitter and receiver uses mode of frequency regulation, transmitting oscillator adopts crystal oscillator and octamonic amplifier, thereby the frequency response of this machine is wide, fidelity height, lamprophonia;

3, because the megaphone transmitter is to adopt wireless transmission, it is extremely convenient to use, and nimbly and freely, is particularly suitable for various buses, station wagon and touring car.

Description of drawings

Fig. 1 is the functional-block diagram of transmitter of the present utility model

Fig. 2 is the functional-block diagram of receiver of the present utility model

Fig. 3 is a transmitter circuitry schematic circuit of the present utility model

Fig. 4 is a receiver circuit schematic circuit of the present utility model

Fig. 5 is the functional-block diagram of invisible antenna of the present utility model

Fig. 6 is an invisible antenna circuit theory line map of the present utility model

Embodiment

Shown in Fig. 1-2, with the vehicular sound equipment of wireless megaphone, comprise megaphone that is provided with transmitter and the sound equipment that is provided with receiver, antenna, described transmitter and receiver connects signal by antenna.

As shown in Figure 3, the concrete structure of transmitter is as follows:

Anodal resistance R 1, the capacitor C 1 of connecting of microphone MIC, minus earth,

Potentiometer W1 decides arm and connects capacitor C 1, and swing arm connects capacitor C 2,

Triode BG1 base stage connects capacitor C 2, C3, R2, and collector electrode connects resistance R 3, triode BG2 base stage, and emitter connects resistance R 4,

Triode BG2 collector electrode connects resistance R 5, capacitor C 5, and emitter connects resistance R 6, R2, capacitor C 4,

Resistance R 7 one ends connect capacitor C 5, the other end connects variable capacitance diode D1, crystal oscillator J1,

Triode BG3 base stage connects crystal oscillator J1, resistance R 8, capacitor C 6, collector electrode connects 2 pin of capacitor C 8, high frequency transformer B1, and emitter connects resistance R 9, capacitor C 6, and collector electrode connects 2 pin of capacitor C 8, high frequency transformer B1, emitter connects resistance R 9, capacitor C 6, C7

1 pin of high frequency transformer B1 connects

capacitor C

8,2 pin and connects triode BG3 collector electrode,

capacitor C

8,3 pin connection triode BG4 base stage, and 4 pin connect resistance R 10, capacitor C 9,

Triode BG4 collector electrode connects 2 pin of capacitor C 10, high frequency transformer B2, grounded emitter,

1 pin of high frequency transformer B2 connects

capacitor C

10,2 pin and connects triode BG4 collector electrode,

capacitor C

10,3 pin connection triode BG5 base stage, and 4 pin connect resistance R 11, capacitor C 11,

Triode BG5 collector electrode connects capacitor C 12, C13, coil L1, grounded emitter,

Coil L2 connects capacitor C 13, antenna Y,

Resistance R 12 connects diode D2,

Anode Vcc connects K switch, K switch connects electrode line, electrode line connects 1 pin of resistance R 1, R3, R5, capacitor C 8, high frequency transformer B1,1 pin of resistance R 10, capacitor C 10, high frequency transformer B2, resistance R 11, capacitor C 12, coil L1, resistance R 12, capacitor C 14, C15

Battery cathode connects ground wire Vss, and ground wire connects the microphone negative pole, potentiometer is decided arm, capacitor C 3, resistance R 4, capacitor C 4, resistance R 6, variable capacitance diode D1, capacitor C 7, resistance R 9, capacitor C 9, triode BG4 emitter, capacitor C 11, triode BG5 emitter, diode D2, capacitor C 14, C15.

Should use 1.5 volts of batteries of two joints by transmitter.During use, the power-on K switch, power supply indicator D2 is bright, and the expression transmitter has entered operating state.

During use, the power-on switch, power supply indicator is bright, the voice signal of ticket seller or waiter's speech is after microphone MIC picks up, deliver to potentiometer W1 via capacitor C 1, regulate volume through potentiometer W3, by regulating volume potentiometer W3, changed by triode BG1, the amplifier that BG2 forms is to the amplification quantity of audio signal, changed the oscillating part modulation degree simultaneously, also changed the volume of receiver simultaneously, via triode BG1, signal after the amplifier that BG2 forms amplifies is by capacitor C 5, resistance R 7 is sent into crystal oscillator J1, variable capacitance diode D1 carries out frequency modulation(FM) to frequency of oscillation.

This machine oscillator is formed oscillator by triode BG3, capacitor C 6, transformer B1, crystal oscillator J1, variable capacitance diode D1, carries out frequency stabilization by crystal oscillator J1, and by transformer B1, triode BG4, transformer B2 frequency is carried out frequency multiplication, to obtain maximum frequency deviation.

High frequency amplifies by the high-frequency signal of triode BG5 after with frequency multiplication and amplifies, and the high-frequency signal after the amplification radiate via capacitor C 13, coil L2, antenna Y.

As shown in Figure 4, the concrete structure of receiver is as follows:

1 pin and 16 pin of receiving integrate circuit IC1 (TDA7021) meet capacitor C 1, C12 respectively, and the connection of all the other each pin of receiving integrate circuit IC1 is as follows:

2 pin connect capacitor C 2,

3 pin ground connection,

4 pin connect capacitor C 3, C4, coil L1,

5 pin connect capacitor C 3, C4, coil L1,

6 pin connect C5,

7 pin connect capacitor C 6, C7;

8 pin connect capacitor C 7,

9 pin connect resistance R 1,

10 pin connect capacitor C 8,

11 pin connect capacitor C 8,

12 pin connect capacitor C 9, and capacitor C 9 other ends connect reception antenna Y,

13 pin connect capacitor C 10,

14 pin connect resistance R 5, and the other end of resistance connects capacitor C 13,

15 pin connect capacitor C 11,

Triode BG1 base stage connects resistance R 1, R2, and collector electrode connects resistance R 3, and emitter connects power supply,

Triode BG2 base stage connects resistance R 3, and collector electrode connects power supply, and emitter connects resistance R 4,

Positive source connects power line through resistance R 8, and power line connects capacitor C 1, C2, C5, C6, C14, resistance R 2, triode BG1 emitter, triode BG2 collector electrode respectively,

Power cathode ground connection, ground wire connect capacitor C 10, C11, C12, C14, integrated circuit (IC) 1 (TDA7021) 3 pin respectively.

Switch integrated circuit IC2 (CD4066) 14 pin connect positive source, 7 pin, 10 pin and connect the power-polar region, and all the other each pin connect as follows:

1 pin connects preposition utmost point R output,

2 pin connect diode D2, power amplifier R input,

3 pin connect preposition utmost point L output,

4 pin connect diode D1, power amplifier L input,

5 pin connect resistance R 6, R9,11 pin of integrated circuit (IC) 2,13 pin,

6 pin connect 12 pin of resistance R 4, integrated circuit (IC) 2,

8 pin connect diode D1, D2,

9 pin connect resistance R 7, capacitor C 13,

11 pin connect resistance R 6, R9,5 pin of integrated circuit (IC) 2,13 pin,

12 pin connect 6 pin of resistance R 4, integrated circuit (IC) 2,

13 pin connect resistance R 6, R9,5 pin of integrated circuit (IC) 2,11 pin,

Triode BG3 base stage connection resistance R 9, collector electrode connect resistance R 10, emitter connects positive source,

Triode BG4 base stage connects resistance R 10, collector electrode connects diode D3, relay J 1 coil, grounded emitter,

Relay J 1 coil one end connects triode BG4 collector electrode, diode D3, another termination positive source, relay J 1 fixed contact and connects positive source, often starts the contact and connect power amplifier power supply,

The power-polar curve connects capacitor C 15, C16, integrated circuit (IC) 2D7 pin, 10 pin, and the positive source line connects 14 pin of resistance R 8, R6, R7, capacitor C 15, C16, diode D3, relay J 1 coil, relay J 1 fixed contact, integrated circuit (IC) 2.

Receiver transmission line principle explanation of the present utility model:

The signal that receiver receives is sent into 12 pin of integrated circuit (IC) 1 (TDA7021) via

capacitor C

9, and 12 pin of this integrated circuit are signal input part, and 14 pin are audio output, and 9 pin are the field intensity signal output, and 5 pin are external LC local oscillator end.

Audio signal after integrated circuit (IC) 1 (TDA7021) demodulation is exported by 14 pin, delivers to switch integrated circuit IC2 (CD4066) 9 pin through resistance R 5, capacitor C 13.

When integrated circuit (IC) 1 (TDA7021) receives with the corresponding transmitter signal of local oscillation signal, its 9 pin can be exported a field intensity signal, here, the switching voltage of this field intensity signal, go the opening and closing of each switch of control integrated circuit IC2 (CD4066) again by the open and close of triode BG1, BG2 as triode BG1, BG2.

Switch integrated circuit IC2 (CD4066) has 4 groups of switches, and wherein 1 pin, 2 pin, 13 pin are one group, and 3 pin, 4 pin, 5 pin are one group, and 8 pin, 9 pin, 6 pin are one group, and 10 pin, 11 pin, 12 pin are one group.

Here, wherein two group of 1 pin, 2 pin, 13 pin and 3 pin, 4 pin, 5 pin are set at normally closed with IC2 (4066), two group of 8 pin, 9 pin, 6 pin and 10 pin, 11 pin, 12 pin often are set at and open in addition, the retractable audio signal of prestage output, CD (or VCD, DVD etc.) audio signal are imported from 1 pin, 3 pin of IC2,2 pin, the output of 4 pin, the audio signal of receiving integrate circuit IC1 (TDA7021) is from the 9 pin input of IC2, the output of 10 pin.

When integrated circuit (IC) 1 (TDA7021) receives with the corresponding transmitter signal of local oscillation signal, the field intensity signal of 9 pin output makes triode BG1, BG2 conducting, the voltage of exporting after the triode conducting is sent into 6 pin, 12 pin of switch integrated circuit IC2 (CD4066) through resistance R 4, make normal open switch 8 pin, 9 pin and 10 pin, 11 pin be converted to normally closed, 8 pin, 9 foot controls transfer to when normally closed, and audio signal is sent into final-stage power amplifier respectively by 9 pin, 8 pin, diode D1, D2; 10 pin, 11 foot controls transfer to when normally closed, make normally closed switch 1 pin, 2 pin and 3 pin, 4 pin often be converted to and open, and disconnect preposition audio signal, make triode BG3, BG4 conducting simultaneously, when triode BG4 conducting, relay J 1 closure is connected the final-stage power amplifier power supply.

Shown in Fig. 5-6, the invisible antenna circuit is formed structure and is:

Antenna Y connects 1 pin, 3 pin of high frequency transformer B1,2 pin of B1,5 pin, 7 pin ground connection, and 4 pin of B1 connect capacitor C 1, and 6 pin of B1 connect capacitor C 2;

Triode BG1 base stage connects capacitor C 1, C2, C3, resistance R 1, R2, and triode BG1 collector electrode connects the base stage of resistance R 3 and triode BG2, grounded emitter;

Triode BG2 collector electrode connects resistance R 5, capacitor C 5, emitter connecting resistance R4, R2, R1, capacitor C 4;

Triode BG3 base stage connects resistance R 6, capacitor C 5, and collector electrode connects 3 pin of resistance R 7, capacitor C 7, C8, high frequency transformer B2, and emitter connects resistance R 8, capacitor C 6;

3 pin of high frequency transformer B2 connect the BG3 collector electrode, and 2 pin connect capacitor C 7, C8, and 1 pin connects capacitor C 7,4 pin and connects

capacitor C

9,5 pin ground connection,

Triode BG4 base stage connects resistance R 10, and collector electrode connects resistance R 1, R2, grounded emitter;

Positive source Vcc connects: 1 pin of resistance R 3, R5, R6, R7, capacitor C 7, high frequency transformer B2, capacitor C 10, C11;

Power cathode Vss earth connection, ground wire connects: 2 pin of high frequency transformer B1,5 pin, 7 pin, capacitor C 3 triode BG1 emitters, triode BG4 emitter, capacitor C 4, resistance R 4, capacitor C 6,

resistance R

8,5 pin of high frequency transformer B2, capacitor C 10, C11.

The operation principle of invisible antenna is:

Localpower inserts from the radio reception power supply, opens the broadcast receiver power supply, and this machine promptly enters operating state; The signal that antenna Y picks up is coupled to secondary through transformer B1, simultaneously, secondary coil and capacitor C 1, C2, C3 form high pass and the low pass frequency selection circuit signal after with frequency-selecting and deliver to triode BG1 base stage, signal amplifies the back through triode BG1, BG2 and delivers to the base stage of triode BG3 by capacitor C 5, and signal is delivered to wireless antenna input by the secondary and capacitor C 9 of transformer after the frequency-selecting amplification that triode and transformer B2, capacitor C 7, capacitor C 8 are formed.

The signal amplitude restriction of amplitude-modulated signal is finished by triode BG4, when amplitude-modulated signal reach a certain height, wireless AGC voltage raises, the AGC voltage of introducing from broadcast receiver makes triode BG4 conducting, thereby the base voltage of triode BG1 is descended, the amplification quantity of signal also descends thereupon, makes the amplitude of signal remain on a good stable amplitude.

Claims

1, with the vehicular sound equipment of wireless megaphone, it is characterized in that: comprise megaphone that is provided with transmitter and the sound equipment that is provided with receiver, antenna, described transmitter and receiver connects signal by antenna.

2, the vehicular sound equipment with wireless megaphone according to claim 1, it is characterized in that: described transmitter comprises microphone, microphone amplifier, local oscillation and octamonic amplifier, amplifier, described microphone, microphone amplifier, local oscillation and octamonic amplifier, amplifier are connected successively, and described microphone amplifier, local oscillation and octamonic amplifier, amplifier all are connected with power supply.

3, the vehicular sound equipment with wireless megaphone according to claim 1, it is characterized in that: described receiver comprises megaphone receiver, audio frequency automatic switch, amplifier power supply automatic switch, described megaphone receiver is connected with audio frequency automatic switch, amplifier power supply automatic switch respectively, and described megaphone receiver, audio frequency automatic switch, amplifier power supply automatic switch all are connected with power supply.

4, the vehicular sound equipment with wireless megaphone according to claim 2 is characterized in that: the local oscillation of described transmitter and the oscillator of octamonic amplifier adopt variable capacitance diode.

5, the vehicular sound equipment with wireless megaphone according to claim 1, it is characterized in that: this vehicular sound equipment also is provided with the invisible antenna that uses for stereo set, be composed in series successively by antenna, impedance conversion and frequency-selector, signal amplifier and adapter, signal amplifier connects power supply; Described antenna adopts rectangular copper wire to make, and is embedded in the panel of stereo set.