JPS60128725A - Radio communication equipment - Google Patents

Abstract

PURPOSE:To reduce the transmission power without causing head break phenomena at a transmission/reception switching time by starting a device in accordance with the operation of a transmission/reception switching means to transmit interruptedly a carrier wave at a prescribed period and releasing an interrupted transmission means in accordance with the operation of an audio signal discriminating means. CONSTITUTION:When a PTT button 14 is operated to connect a switching contact 14C and a make contact 14b, one input side of an AND circuit 10 is made active, and the other input side of the AND circuit 10 is made active through an inverter 9, and an astable multivibrator 11 is oscillated, and a high-frequency transmitting power circuit 5 radiates the interrupted carrier wave from an antenna 7. When an audio signal is generated by a mike 1, the output side of a VOX circuit 8 is made active, and an interrupted transmission control signal switch 12 is operated to switch an interrupted transmission control signal to a reference potential point. Therefore, a transmission signal modulated by the audio signal is radiated from the high-frequency transmitting power circuit 5 through the antenna 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention also relates to a wireless communication device that uses radio wave types such as AM and FM that emit carrier waves.

Conventionally, the radio wave formats of wireless communication devices include radio wave formats such as AM and FM that emit a carrier wave even when a signal is received (hereinafter referred to as AM, FM, etc.), and radio wave formats such as SSB that emit a modulated wave only when a signal is present. There is a radio wave type that does not emit radio waves when there is no signal. In addition, the transmission/reception switching means includes a manual switching means by operating the transmission/reception switching electric key and an automatic switching means depending on the presence or absence of an audio signal.
X) and Hiseis Operation (VOX),
Incorporated into wireless communication equipment.

When you operate the transmit/receive switch key on the unit and switch from reception to transmission, a carrier wave is emitted for AM, FM, etc.

The other party's wireless communication device is waiting for reception, and when there is no desired radio wave to be received, the squelch circuit is inactive and closed, cutting off the main path of the reception system to the speaker. When a carrier wave is sent out from this device, the squelch circuit of the other party's wireless communication device operates and opens, forming a main path to the speaker. In addition, a viziranzo may be lit to indicate that the desired radio wave has been received. When you operate the transmit/receive switch key on this unit to switch from transmitting to receiving, this unit's wireless communication device will stop transmitting carrier waves to the other party's wireless communication device while waiting for reception. The squelch circuit of the other party's wireless communication device that is receiving the audio signal closes due to the interruption of the carrier wave, cutting off the main path of the receiving system to the speaker. The wireless communication device on the device side is on standby for reception, the squelch circuit is closed, and the main receiving path to the speaker on the device side is cut off. Note that the squelch circuit is provided with a recovery delay type time constant circuit to prevent malfunction even if the level of the desired signal fluctuates due to noise or the like and becomes below a certain limit value. The OJ resistor for squelch is installed so that the above-mentioned fixed limit can be changed.

Mobile radio JFI with 13 portable radio stations and built-in batteries
Devices such as Nobuiso and cordless telephones that are always on standby for receiving f! −; In order to reduce power consumption, it is possible to use either rapid reception standby or intermittent reception standby as necessary.
There are t plans. On the other hand, in a transceiver that is used in a different state from that of a cordless telephone, the power consumption ratio between the receiving circuit and the transmitting circuit, including the reception standby IJ and IJ, is larger for the transmitting circuit, resulting in a total consumption of 71S, which reduces power. In order to achieve this, it is desirable to reduce the power consumption of the transmission system circuit.

Therefore, the vO radiated to the high frequency transmission power only when there is a signal.
Although an It is designed to perform transmission/reception switching operations.

Therefore, it is difficult to reduce the power consumption related to the transmission system circuit.

The purpose of the present invention is to solve the above-mentioned problems.
Reduced power consumption by not emitting continuous carrier waves during silent periods during transmission) 1! The purpose is to provide a ζ-ray communication device.

An embodiment of a wireless communication device according to the present invention will be described below with reference to the drawings.

In the figure, 1 is a microphone and 2 is an amplifier.

The main path of the transmission system is microphone 1, amplifier 2, intermediate frequency circuit 3,
It is composed of a high frequency circuit 4 and a high frequency transmission power circuit 5, and the power supply for the transmission system circuit is the closed switching contact 14c of the PTT button 14.
and is supplied from terminal E via make contact 14b. When a power switch (not shown) provided in the power supply circuit 13 is turned on, power to the receiving circuit 15 is supplied through a switching contact 14C1 and a break contact 14a of the PTT button 14. While waiting for reception, when the desired radio wave is received, antenna 1,
Transmission/reception switching switch, terrorist switching contact 6c, break contact 6
a. The audio signal received from the speaker 16 via the receiving circuit 15 is output.

The intermittent transmission means is composed of a VOX circuit 8 and an unstable multi-byte break 11. When the PTT button 14 is operated and the switching contact 14c and the make contact 14b are closed, one input side of the AND circuit IO becomes active. When no audio signal is generated by the microphone 1, the output side of the VOXN path 8 remains inactive.

Therefore, fl of the AND circuit 10 is connected via the inverter 9.
:, +When the input side of the force is active, the unstable multi-wave break 11 oscillates and transmits an intermittent transmission control signal at high frequency through the make contact 12a and switching contact 12c of the intermittent transmission control signal switch 2. It is output to the control 9A1 terminal of the power circuit 5. High frequency transmission power circuit 5 radiates a carrier wave from antenna 7 . When an audio signal is generated by microphone l, VOX
The output side of the circuit 8 becomes active and the intermittent transmission control signal switch 1
2 is activated, and the intermittent transmission control signal is switched to the reference potential point.

Therefore, a transmission signal modulated by the audio signal is radiated from the high frequency transmission power circuit 5 via the antenna 7. The other party's wireless communication device is on standby for reception, the squelch circuit is in an inactive state with no carrier wave, and the squelch circuit is closed and the main path of the receiving system to the speaker is blocked or attenuated. When an intermittent carrier wave is received, the squelch circuit operates and opens to form the main path to the speaker. Since the squelch circuit is provided with a time constant circuit to prevent malfunction, it continues to operate following the intermittent transmitted carrier waves without recovery until it receives the modulated wave. Therefore, when the modulated wave is received, the squelch circuit remains open, so that the phenomenon of partial loss of the audio signal does not occur.

The wireless communication device according to the present invention includes an intermittent transmission means that is activated in response to the operation of the transmission/reception switching means and listens to and transmits a carrier wave at a predetermined cycle, and an intermittent transmission means that is activated in response to the operation of the audio signal identification means. Since the system is equipped with a recovery means for recovery, it has a feature in that the general transmission wave is transmitted intermittently when there is no voice. Therefore, there is an effect of reducing transmission power without causing a head-off phenomenon when switching between transmission and reception.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a wireless communication device according to the present invention. In the figure, l is a microphone, 2 is an amplifier, 3 is an intermediate frequency circuit, 4 is a high frequency circuit, 5 is a high frequency transmission power circuit, 6 is a transmitting/receiving switch, 7 is an antenna, 8 is a cable X circuit, 9 is an inverter. 10 is an AND circuit, 11 is an unstable multivibrator, 12 is an intermittent transmission control signal switch, 13 is a power supply circuit, 14 is a PTT button, 15 is a receiving circuit, and 16 is a speaker. Patent applicant Yaesu Musen Co., Ltd.

Claims (1)

[Claims] l. A radio communication device comprising an audio signal identification means, a transmission/reception switching means, and a high frequency transmission means for emitting a carrier wave in accordance with the operation of the transmission/reception switching means, which is activated in response to the operation of the transmission/reception switching means. an intermittent transmitting means for transmitting the carrier wave intermittently at a predetermined cycle; and a restoring means for restoring the intermittent transmitting means activated in response to the operation of the voice signal identifying means. A wireless communication device O characterized in that it is configured to output intermittent carrier waves from high frequency transmitting means when a signal is not identified.