JPS6342753Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a speech transmitter in combination with a transmitter and a microphone.

For example, if a cash transport vehicle is robbed, it is necessary to use a microphone to secretly communicate that an emergency has occurred. In this case, if you speak directly into the microphone, your voice will be heard by the microphone. Also, if you speak in a low voice so as not to leak your voice, the other party will not be able to hear you. Furthermore, in order to use electrical audio signals instead of audio, it is necessary to modify the structure of the microphone so that the audio signals can be electrically connected to the microphone. However, it is not permitted to modify certification equipment such as simple radios, and if such modifications are made, government permission is of course required, which is virtually impossible. Therefore, in the past, it has been impossible to secretly transmit calls using verification equipment such as simple radios.

The purpose of this invention is to provide a voice transmitting device that can electrically transmit a voice secretly as an audio output signal of a microphone without modifying the microphone itself or speaking into the microphone.

Next, this invention will be explained based on examples and with reference to the drawings.

FIG. 1 is a block diagram showing a microphone hanger and a circuit block according to the present invention. In this figure, reference numeral 1 denotes a hanger body, inside of which a microphone 2 can be placed as shown in the figure.
Below the hanger body 1 is a signal line that transmits the audio signal sent from the microphone 2 to the transmitter 20, and a control signal that is sent from the microphone 2 and sets the transmitter 20 to the transmission mode by operating a press-to-talk switch, which will be described later. A microphone cable 3 having a control line for sending out is connected.
And 21 indicates a microphone element. A solenoid 4 serving as a transmission/reception mode switching means is installed on the side of the hanger body 1, and a press-to-talk switch 6 attached to the tip of the drive shaft of the solenoid 4 or the microphone 2 can be pressed.

When pressed, this press-to-talk switch 6 sends a control signal (PTT signal) to the transmitter 20 via the microphone cable 3, setting the transmitter 20 to a transmission mode so that the microphone 2 can transmit speech. It is meant to be.

On the other hand, the electromagnetic coupler 5 is attached so as to surround the outer peripheral surface of the microphone cable 3. Electromagnetic coupler 5
As shown in FIG. 2, the coil is wound around a semicircular or U-shaped core to form an electromagnetic coil. With this shape, the microphone cable 3 can be easily attached to the outer peripheral surface. When a start operation such as a voice operation by giving a predetermined voice or a button operation is performed, a control signal is sent out in the signal generating section 10. This signal generating section 10 is branched and connected to a transmission signal section 12 and a solenoid drive circuit 13 via a control signal processing section 11 . The transmit signal section 12 is connected to the electromagnetic coupler 5, while the solenoid drive circuit 13 is connected to the solenoid 4. 14
is provided on the transmitter 20 and the microphone cable 3
This is an amplifier connected to the signal line from.

When the signal generating section 10 is operated to start by voice operation or other operation, a start command signal is sent from the signal generating section 10 to the control signal processing section 11. Then, a drive signal is sent from the control signal processing section, passes through the solenoid drive circuit 13, drives the solenoid 4, and turns on the press-to-talk switch 6. At the same time, this drive signal is transmitted to a transmission signal section 12 of, for example, a tape recorder, a voice synthesizer, etc., from which a predetermined voice signal or a synthesized voice signal is supplied to the electromagnetic coupler 5. At this time, a current indicating the above-mentioned audio signal or synthesized audio signal flows through the microphone cable 3, and the microphone cable 3
A speech signal or a synthesized speech signal is induced and input to the speech signal. As a result, an electrical audio signal or a synthetic audio signal can be transmitted without directly inputting audio to the microphone 2.

FIG. 3 is a diagram explaining the principle of this invention, and shows that such a cable has a certain characteristic impedance, and this ground wire 16 and core wire 1
If a magnetic field of the same phase is applied to 5, this core wire 1 will always
A voltage is generated between the ground wire 16 and the ground wire 16. This proposal attempts to amplify the signal indicated by the voltage generated here as a microphone signal.

Therefore, according to this invention, audio signals can be electrically processed without modifying the microphone or speaking into the microphone. Therefore, confidential transmissions are also possible. According to this invention, the microphone to be applied may be one with a coil or one without a coil such as a crystal microphone. Further, the press-to-talk switch shown in the embodiment of the present invention can be omitted, for example, if the transmitter side is kept in the transmitting state.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of the microphone hanger and circuit block of this invention, FIG. 2 is a detailed view of the electromagnetic coupling coil, and FIG. 3 is a diagram explaining the principle of this invention. 1...Hanger body, 2...Microphone, 3...
…Microphone cable, 4…Solenoid, 5
...Magnetic coupler, 6...Press-to-talk switch.

Claims (1)

[Claims for Utility Model Registration] A microphone that provides an audio signal to a signal line provided in a microphone cable, and a transceiver that is connected to the microphone cable and transmits an audio signal that is input via the signal line. The transmitting device is used in combination, and includes a signal generating section that outputs a control signal when a predetermined operation is performed, and a transmitting section that outputs a pre-stored voice as a transmitting signal when the control signal is input. a speech signal section; a transmitting/receiving mode switching means for setting the transceiver to a transmitting state when the control signal is input; and a transmitting/receiving mode switching means attached to the microphone cable so as to surround the outer circumferential surface thereof to perform electromagnetic coupling with the microphone cable. A transmitting device having an electromagnetic coupler.