CN2054956U - Multi-purpose aural transmitter - Google Patents

Abstract

The utility model relates to an emission device which is used for the listening of TV accompanying sound signal with the use of radios and radio-recorders. The emission device fetches the accompanying sound signal of TV from accompanying sound circuits and sends out through radio waves after the conversion and magnification by electronic circuits, and adjusts the frequency of the sound signal of TV within the receiving frequency scope of the radio, and the radio can receive the signals which are send by the emission device. When a plurality of people watch TV programs or listen to music in one room, in order to avoid influencing and interfering other people to study, read, chat, etc. The use of a multi-purpose accompanying sound emitter, one or a plurality of people can listen to TV programs accompanying sound or the music which is played by the radio in one area, and the radio does not need any change.

Description

Multi-purpose aural transmitter

The invention belongs to a kind of multipurpose sound transmitter.It can take out the audio signal of television set (recorder, electronic organ etc.) from television audio circuit, change through electronic circuit, amplifying the back goes out with radio wave transmission, simultaneously its frequency is adjusted in the broadcast receiver receive frequency range, receive the television field frame of arbitrary channel with regard to available broadcast receiver, also can change the sound accompaniment of receiving other TV programme with the conversion of the television channel of being viewed and admired.

At present, domestic and television set, radio-cassette player, electronic organ import all do not have wireless sound accompaniment to transmit and receive device.General television set (radio-cassette player, electronic organ) has only an earphone jack, be equipped with one pair of insert earphone (wired) at random, its objective is when watching TV programme for same room one people, for activities such as the study that avoids interference other people, the talks of working and receive a visitor, insert earphone can be inserted television set or recorder jack.One people appreciates TV programme or listens to the music of dulect audio tape.But the line of common insert earphone has only one meter long, is unfavorable for the sound equipment of sound accompaniment of distance reception TV programme and radio-cassette player.Though can adopt the method for line spreading, exist limitation, not only inconvenience but also not attractive in appearance, and have only a jack, and can only be with one pair of earphone one people to appreciate, can't resolve the requirement that many people listen to.

The objective of the invention is to provide a kind of novel TV sound accompaniment emitter.This device volume is little, handsome in appearance, circuit is simple, with low cost, easy to use.This device can take out television audio signals from sound accompaniment circuit, after the electronic circuit conversion is amplified, go out with radio wave transmission, receive its signal with broadcast receiver again, by this device, make general common broadcast receiver possess two kinds of functions: 1. program that can the broadcast listening radio station; 2. can listen to television set (radio-cassette player, electronic organ etc.) audio signal.The amplitude modulation broadcast receiver that one Daepori is logical is mixed a transmitter, inserts the television set jack with this transmitter, and just radius is the television field frame of listening to of being satisfied with in 5 meters the scope in the family; With this transmitter insert recorder earphone jack just can be in a room or next room listen to the dulect music that recorder emits with broadcast receiver and do not send the movable sounds such as disturbing other people rest, reading, study, talk; Insert the electronic organ earphone jack with this transmitter, two people can people teaching, and a people plays the musical instrument on the spot and is independent of each other and disturbs other people.Because common broadcast receiver generally all has earphone jack, insert earphone to be plugged, wireless loud speaker just can not send any sound.When in electronic teaching, using, can add 1～2 grade of amplifying circuit again, increase transmitting power, just can create a good teaching environment that quietly, is not affected.In addition, also the structure division of this transmitter can be removed, and circuit part directly is contained in the interior sound accompaniment circuit of television set (radio-cassette player, electronic organ etc.), by a change over switch, broadcast receiver just can be received the audio signal of television set (radio-cassette player, electronic organ).Because this device is a radio transmission, thereby is not subjected to any restriction of room, furnishings, can many people utilize broadcast receiver (adding earphone) to listen in the same area.Broadcast receiver need not done the change on any structure or the circuit yet, simultaneously to broadcast receiver also without any injurious effects, but increased wireless function.2 people or 3 people think to utilize simultaneously this broadcast receiver to listen to television field frame if having only a broadcast receiver, broadcast receiver can be changed a little, that is: near former broadcast receiver earphone jack, be connected in series 1～2 earphone jack again and mix the demand that the just available broadcast receiver of insert earphone satisfies two to three people, this change there is not harm to broadcast receiver yet, sound can reduce a bit a little when just 2～3 people plugged insert earphone simultaneously, and can open big wireless volume switch to remedy this deficiency this moment.With broadcast receiver when only plugging in an insert earphone and do not do to change preceding not the same, this change generally has the people of an electrician, radio knowledge to be competent at.

Task of the present invention to finish mode as follows: the parts of multipurpose sound transmitter and circuit board all are assembled in the plastic casing of a good looking appearance, open bonnet during use earlier, 5 of 1.5 volts at two joints of packing into ^#Battery, the end with plug cord inserts the transmitter jack then, and at this moment the light-emitting diode on the transmitter is shinny, and the on of expression transmitter supply can be come into operation.Pull out transmitter antenna, the other end plug with plug cord inserts television set or recorder earphone jack then, and be placed on medium wave band to wireless band switch this moment, and its tuning change at quarter dish is transferred to 1400KH ₂About, suitably rotate wireless direction and the tuning turn-knob of fine setting broadcast receiver, make television audio signals or the recorder output signal received the strongest, the most clear.Adjust the broadcast receiver volume switch, make volume moderate, but the audio signal of the TV programme play of uppick television set just, and with the conversion of television channel, the also corresponding conversion of the audio signal that broadcast receiver is received.This carrier of transmitter frequency is at 530KH ₂～22MH ₂Several different frequencies of interior branch, and fine-tuning its frequency, this anti-neighbours's phase mutual interference.Its operation principle is: 1.5 volts the battery of two joints of packing into, insert the transmitter signal input socket with an end of plug cord, at this moment K switch ₁Connect light-emitting diode D ₁Pass through resistance R ₁Flow through electric current, the shinny expression power connection of diode, transmitter enters operating state.This moment, the other end with plug cord inserted in television set or the recorder earphone jack, and its audio signal just is input in the transmitter by plug cord, socket.Signal is just through capacitor C ₁Be coupled to transformer T ₁Elementary, transform to secondaryly again by transformer, be modulated to L ₁Oscillator signal on, again through L ₁Be coupled to L ₂On, the bundle of lines signal is launched through the sky.BG ₁, BG ₂, R ₃, R ₄, C ₂, C ₃, C ₄Form an astatic multivibrator, regulate C ₄Can change the frequency of oscillator, the electromagnetic wave of the certain frequency that it produced passes through L as the carrier wave of transmitter signal ₁Through modulation transformer input signal is modulated on the carrier wave again, through L ₂Launch, generally carrier signal all is transferred on the wireless medium wave band,, be convenient to receive the signal of transmitter like this because the broadcast receiver that generally uses in the family all possesses medium wave band.

Below in conjunction with the drawings and Examples structure invention is described in further detail.

Fig. 1 is a structural front view of the present invention.

Fig. 2 is a structure vertical view of the present invention.

Fig. 3 is that signal input and output plug of the present invention connects line chart.

Fig. 4 is circuit theory diagrams of the present invention.

In conjunction with the accompanying drawings 1, the shell (1) of the multipurpose sound transmitter of duroplasts moulded section has two batteries fixedly turn-knob (2), (3) on the top panel of shell.

In conjunction with the accompanying drawings 2, the signal input socket switch (4) of holding concurrently, the display window (6) of antenna (5) light-emitting diode, back shroud (7), components and parts all are welded on the printed circuit board (PCB), and circuit board is assemblied in the plastic casing.

Claims (2)

1, the aural transmitting circuit of forming by an astatic multivibrator, wherein power supply E ₁And K switch ₁And resistance R ₂With capacitor C ₅Be in series, the anode of light-emitting diode connects resistance R ₂And capacitor C ₅, negative terminal and resistance R ₁Be in series, they all are connected between power supply and the ground, when power connection, and K switch ₁Connect, supply voltage is to outer member C ₅Discharge and recharge light-emitting diode D ₁Electric current pass through resistance R ₁Flow through diode D ₁Shinny, transmitter enters operating state, coupling capacitor C ₁Be connected the elementary of modulation transformer, secondary wiring circle L ₁, triode BG ₁, BG ₂Resistance R ₃, R ₄, capacitor C ₂, C ₃, C ₄Form astatic multivibrator, regulate C ₄Can change the frequency of oscillator, coil L ₂One termination antenna, a termination ground wire makes the electromagnetic wave that produces certain frequency come radiation by antenna and ground wire, it is characterized in that audio signal is through capacitor C ₁, transformer T ₁Joining frequency of oscillation is 530KH ₂～22MH ₂The input of astatic multivibrator carries out the signal modulation in the scope, and this modulation signal is again through output winding L ₂Antenna is launched with the form of radiobeam.

2,, it is characterized in that circuit part can directly be installed in the sound accompaniment circuit of television set or recorder, realizes the wireless transmission of audio signal by a change over switch according to the aural transmitting circuit described in the claim 1.

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