JP3069574U - External control voice transmitter for radio - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] To provide a circumscribed voice control transmitter of a wireless device, which does not require a battery and is not affected by reception of a back signal. A circumscribed voice control transmitter is connected to a circuit from a circumscribed receiver A by shunt resistors R1 and R2. A point
The point E is connected in series and the resistance value below the transmission critical point can transmit the radio signal. Since the insignificant current obtained at point A is used for the voice control circuit, a circuit that consumes very little current is designed. The most important of these voice control circuits is the microphone, which is a skin contact sensitive microphone that has low current consumption, small volume, large output signal, and isolates background noise. Because it senses vibration from human skin and converts it into voltage,
Completely isolates background noise.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a circumscribed sound control transmitter of a wireless device which does not require a battery and is not disturbed by the reception of the back.

[0002]

[Prior art]

 A conventional wireless device has a structure in which a PTT, which is a switch for transmitting a voice, must be manually pressed when transmitting a voice. For this reason, drivers such as airplanes, ships, cars, motorcycles, traffic police, fire brigade, rescue teams, work vehicles at factories and construction sites, etc., operate the handle with one hand and at the same time with the other hand. I use a wireless transmitter. Such a one-handed steering operation has a risk of causing an accident by being distracted by the wireless transmitter. For this reason, wireless devices that can transmit without using hands are now on the market. Such radios are classified into a type in which an external terminal and an infinite output current can be used for an external circuit, and a type in which an external power supply terminal is not provided.

[0003]

[Problems to be solved by the invention]

 However, the latter type, which does not have an external power supply terminal, occupies an absolute number in the market, because a battery is used in the voice control transmitter, so that acid or alkali is easily generated from the battery, and the circuit is corroded and destroyed. Have the problem that In addition, since the battery has a limited life, there is also a problem that the battery is not used when the user wants to use the battery and must wait for charging or replace the battery.

[0004] On the other hand, both the former and latter types have a problem in using a transmitter for voice control. In other words, since the air-conduction open-type microphone is used, all background noises other than the user's voice are picked up, and the voice control transmitter frequently malfunctions. When there is a need for a voice-controlled transmitter, there are many situations where the sound of the back is loud or the wind cuts off. Therefore, the problem of picking up all the background noise greatly hinders the practicality of the radio.

[0005] Therefore, an object of the present invention is to provide a circumscribed voice control transmitter of a wireless device, which does not require a battery and does not receive reception interference from the back.

[0006]

[Means for Solving the Problems]

 In order to achieve the above objective, the external voice control transmitter of the wireless device adopts the following power supply security method. From the point A of the circumscribed handset, a connection is made to a point in the circuit requiring a power supply by the shunt resistors R1, R2. Point A of the external handset of a general radio is connected to the internal power supply VCC using a load resistor RA. The original purpose is to supply the current used by the external condenser microphone, and when the manual switch of the external PTT is pressed, the output signal is amplified at that point and the carrier wave is modulated. The potential difference generated at that point is transmitted to the voltage differential switch circuit, and a radio signal can be transmitted by opening and closing the switch. By connecting point A and point E of the common circuit in series, a resistor having a value less than the transmission critical point can transmit a radio signal. The resistance varies depending on the model, but it is between about 10 kΩ and 220 kΩ. If it is desired to use the current obtained by point A for the external voice control circuit, the total resistance of the circuit must not be less than the resistance below the transmission critical point. Taking a wireless device on the market as an example, between A and E is connected by a resistor having a transmission critical point of 82 kΩ or less, and can transmit a signal. As a result, the total resistance of the external voice control transmitter must not be less than 82 kΩ. A safer design would be to minimize the total electrical resistance of the circuit to 100kΩ, and if a 100kΩ resistor was connected between A and E, the voltage across it would drop to 4.2V and the current through the resistor would be calculated 42 μA, in other words, the current obtained by the external voice control transmitter of the wireless device If this external voice control circuit is supplied, the consumption current is 42 μA. As described above, since the insignificant current obtained at point A is used in the voice control circuit of the present invention, it is necessary to design a circuit that consumes very little current. By increasing the series load resistance of each class of amplifying components in this circuit as much as possible, the consumption current can be reduced.

The most important of the voice control circuits is a microphone. Among the microphones on the market, a microphone that consumes very little current, has a small volume, has a large output signal, and isolates background noise. Only the skin-touch sensitive piezoelectric microphone satisfies the conditions of the present invention. As shown in FIG. 3, this microphone is made of two enameled voltage chips 5 and 6, both sides of which are metal-plated and facing each other. Becomes One side is in contact with the metal plate 3, the other side of the metal plate emits one electrode by a lead, the other side is in contact with the signal metal conductive chip 7, and the other side of the metal conductive chip 7 is also conductive. Make another electrode. The enameled voltage chips 5 and 6 are installed in the circular containers 1 and 2, and a spring 8 is installed in front of the circular containers to support the enameled voltage chip. There is a space on the back side of the circular container where the circuit board 4 is to be placed. The conductors of the electrodes of the voltage chip are soldered on the space, and the audio signal is output by the power transmission line 9 and the parts of the audio circuit are removed there. To amplify the signal and match the impedance. The front of this microphone is in contact with the throat, cheeks, chest, etc., which resonate and vibrate slightly when a person speaks, and the microphone outputs a voice signal. This microphone completely senses vibration from human skin and converts it into voltage, thus completely isolating the background noise. This microphone uses a piezoelectric element, so it can output the maximum audio signal without using the current used.

[0008]

[Embodiment of the invention]

 As shown in FIG. 1 and FIG. 2, point A (= point A on the wireless device side) in the embodiment of the circumscribed voice control transmitter of the wireless device according to the present invention is connected to point A of the voice control circuit. ing. Point A on the radio side is connected to the point where power is required in the circuit by the shunt resistors R1 and R2, and further passes through the audio filter of the condenser to separate radio waves of different frequencies and send them to the circuit. The audio signal is divided into two circuits at the input point C of the skin contact sensitive piezoelectric microphone. One is sent to the output point D of the audio signal output matching circuit through the capacitor C1. The audio signal after impedance matching is sent to the signal input point A of the microphone of the radio. The other is sent to the point F of the audio control signal amplifier circuit through the capacitor C2. The amplified audio signal is sent to the input point G of the positive voltage rectifier circuit, and is sent from the output point of the rectifier circuit to the input point H of the voice control transmission / reception circuit. Thus, the completed voice is transmitted.

The point B of the speaker of the external telephone receiver is divided into two circuits after connection with the point B of the audio signal control circuit. One is passed directly through points J2 and E and directly input to the speaker of the handset. The other is connected in series to a resistor R3 and a capacitor C3, input to the point L, and sent to the point M of the negative voltage doubler rectifier circuit which gives priority to the transmission of the other party. The signal to which a reverse voltage is applied through the N point of the output point is sent again to the H point of the voice control transmission / reception circuit, and the voice is transmitted by cutting off the voice signal control circuit. This voice signal control circuit can switch on the circuit only after the other party has finished transmitting while the other party is transmitting, and can prioritize the other party's transmission. This circuit can also be opened and closed manually.

[0010] In addition to the main circuit of the above-described audio signal control circuit, peripheral circuits and components are as follows. Mic-1 is a skin contact sensitive piezoelectric microphone. The microphone removes background noise and voice and provides a voice control transmission signal. J1 is the input point of the microphone. J2 is the output point of the speaker of the receiver. J1 and J2 can use one stereoscopic handset. VR-1 is a variable resistance resistor for voice control transmission, which can be changed to a different resistance value by switching a step-type switch.

S-1 is a delay circuit for voice control transmission. This circuit is an alternative to a variable resistor. S-2 is a switch for manual transmission. If one wants to manually transmit this voice signal control circuit, the sensitivity of the voice control transmission must be set to a minimum. By opening and closing S-3, it is possible to operate whether to give priority to the transmission of the other party.

[0012] The audio signal output matching circuit and the audio signal control transmission / reception circuit are connected in series to prevent consumption of current at points K and I. However, only a small number of models have low resistance, so parallel connection must be adopted. The dotted line a in FIG. 2 is connected in series and parallel for convenience. In addition, the circumscribed terminals of a small number of models, automobiles, and seats have independent power supplies, and can be connected to, for example, point A1 in a dotted line section b. If it is desired to further reduce the size of the voice controller, the first-class voice amplifier circuit in section c can be moved into the circuit of the skin contact sensitive piezoelectric microphone.

[0013]

[Effect of the invention]

 According to the present invention, it is possible to output a higher audio signal voltage than a general microphone without using current. This effectively reduces the current consumption of the voice control circuit, completely eliminates the need for batteries, and picks up voice signals even when closed. It also isolates the background noise, does not interfere with reception, and can achieve the best results with the least number of components and most efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of the present invention.

FIG. 2 is a basic circuit diagram of the present invention.

FIG. 3 is a side view of the skin contact sensitive piezoelectric microphone used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circular container 2 Circular container 3 Metal plate 4 Electric circuit board 5 Enamel voltage chip 6 Enamel voltage chip 7 Metal conductive chip 8 Spring 9 Transmission line

Claims (1)

[Utility model registration claims] An audio signal control circuit capable of obtaining power from an external power supply terminal without using a battery, and a radio device for obtaining power from a terminal of an external condenser microphone using a shunt resistor. An external voice control transmitter for a wireless device capable of outputting a high voice signal voltage without using current when used in combination with a skin contact sensitive piezoelectric microphone constituted by a piezoelectric element.