JPH01220920A - Radio telephone set - Google Patents

Abstract

PURPOSE:To reduce the current consumption in the standby state by stopping the power supply to an angular modulator in the standby reception state where a power supply of the radio telephone set main body is supplied. CONSTITUTION:When the transmission is finished, the operation such as on-hook of handset is implemented, a signal attended with the operation is outputted to a controller 7 and a switch 6 is turned off by the controller 7 so as to turn off the power supply of an angular modulator 3, and a switch 6 is turned off. by the controller 7 so as to turn off the power supply of the angular modulator 3. When the power supply of the radio telephone set main body is turned on, the switch 6 is turned off so as to turn off the power supply of the angular modulator 3 in the standby state reception. Thus, the current consumption in the standby state or the like is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a radio telephone device such as a zero-vehicle talking device or a portable radio telephone device.

(Prior Art) In recent years, wireless telephone devices such as car telephone devices and portable radio telephone devices have become widespread.

The conventional wireless telephone device described above is configured such that when the main body of the device is powered on, the modulator also operates in conjunction with this.

In this way, in conventional wireless telephone devices, when the main body of the device is turned on, the modulator is turned on in conjunction with the device, so even when not transmitting, the modulator is operating, so the standby time is There was a problem in that the current consumption increased.

(Problems to be Solved by the Invention) As described above, in conventional radio telephone devices, when the power to the main body of the device is turned on, the power to the modulator is turned on even when the modulator is not in use. The problem with the receiver was that it consumed a lot of current at certain times. This poses a problem in that when operating on a battery, such as in a portable radio telephone device, the battery usage time is shortened.

The present invention is intended to solve the above-mentioned conventional problems,
It is an object of the present invention to provide a wireless telephone device that can significantly reduce current consumption during standby when the modulator is inactive.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a radio telephone device including an angle modulator that modulates a signal to be modulated by adding it to a phase-locked loop. In a standby state in which power is being supplied to the main body of the wireless telephone device, the power supply to the angle modulator is stopped when receiving reception.

(Function) According to the present invention, the power supply to the angle modulator is stopped during reception when the main body of the wireless telephone device is in standby state where power is being supplied, so that the modulator is in an inactive state. The current consumption during standby can be significantly reduced.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram for explaining a wireless telephone device according to an embodiment of the present invention.

In the figure, 1 is an input terminal T52 into which a signal to be modulated is input, a switch, 3 is an angle modulator composed of a phase-locked loop, 4 is a power amplifier (PA), 5 is an antenna, 6
7 is a control unit; and 8 is a lock detector that detects whether the phase locked loop of the angle modulator 3 is locked.

The angle modulator 3 includes an oscillator 9 and a phase comparator (PLL) 10
, low pass filter (LPF) 11, adder 12, VC
O13, a frequency divider 14, and the input terminal 1 mentioned above.
If the signal to be modulated output from is FM modulated,
The signal is input to an adder 12 provided between the low-pass filter 11 and VC013.

A signal to be modulated that is input to an input terminal 1 is supplied to an angle modulator 3 via a switch 2 . The signal modulated by the modulator 3 is transmitted via a power amplifier 4 and an antenna 5. Power for the modulator 3 is supplied via a switch 6. When the switch 6 is turned on and starts operating, the lock detector 8 detects whether the phase locked loop of the modulator 3 is locked. The control unit 7 monitors the output of the detector 8 and determines when to start modulation.

Next, the operation of the above-mentioned radio telephone device will be explained using the flowchart shown in FIG.

First, when the main body of the wireless telephone device is in the on state and receives a standby, the control unit 7 puts the modulator 3 into the operating state by the user's operation, such as when the handset is off-hook or when the dial button is operated. When the necessity is recognized, the switch 6 is turned on to turn on the modulator 3 (step 1).

The control unit 7 also supplements the control channel with information from the receiver (step 2). Next, the control unit 7 determines whether the captured control channel is free (step 3).
. Then, if the control channel is free, the detector 8
Based on the output signal, it is determined whether the phase comparator 10 is locked (step 4). At this time, if the phase comparator 10 is locked, the signal to be modulated is sent to the adder 12 to be modulated and transmitted via the power amplifier 4 and antenna 5.

After that, when the transmission is finished, an operation such as putting the handset on-hook is performed, and a signal accompanying this operation is output to the controller 7, which turns off the power supply to the angle modulator 3. Then, the switch 6 is turned on by the controller 7.

Therefore, in this embodiment, when the main body of the wireless telephone device is powered on, the switch 6 is turned off so as to turn off the power to the angle modulator 3 when receiving a standby signal in which no transmission is being performed. Therefore, it is possible to significantly reduce the current consumption during standby.

Note that the time for the modulator 3 to lock varies from several 100 m5 to about 1 second after the power is turned on. Also, channel acquisition (step 2), is the channel free? In the process of (step 3), variations typically occur on the order of several 100 m5 to several seconds depending on the relationship with the base station. Therefore, if the processing time for channel acquisition and channel availability confirmation is longer than the lock time of the modulator 3, transmission can be performed immediately after the processing is completed, and if the lock time is longer than the processing time, transmission can be performed immediately after locking. Further, when a call is received, power supply to the angle modulator 3 is started based on the received call signal. Therefore, the operating time can be approximately the same as that of a conventional radiotelephone device in which the modulator is always kept on.

In the embodiment described above, the signal to be modulated is
When performing M modulation, the signal is passed through a low-pass filter 11 and V
The adder 12 is provided between the phase comparator 10 and the low-pass filter 11, and the adder 12 is input between the phase comparator 10 and the low-pass filter 11. It is also possible to configure the signal to be input to 12 and subjected to PM modulation.

Further, in the above-described embodiment, signals for off-hook operation and dial operation of the handset are output to the controller 7, and the controller 7 controls turning on and off of the switch 6. However, a timer is provided. This timer turns on the power of the wireless telephone device, and activates the timer when the above-mentioned off-hook operation or dial operation associated with transmission is not performed, or when transmission is completed, Control is performed so that the power supply to the angle modulator 3 is stopped when the above-mentioned handset off-hook operation or dial operation is not performed while this timer is counting a predetermined time and the timer reaches the time limit. The switch 6 may be turned off by the device 7.

[Effects of the Invention] As explained above, the wireless telephone device of the present invention is configured such that the power supply to the angle modulator is stopped during standby while power is being supplied to the main body of the wireless telephone device. This makes it possible to significantly reduce current consumption during standby, when the modulator is inactive.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a radio telephone device according to an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of the radio telephone device of FIG. 1... Input terminal, 2.6... Switch, 3... Angle modulator, 7... Controller, 8... Lock detector, 1
0... th place comparator, 12... adder. Applicant Toshiba Corporation Representative Patent Attorney Sasa Suyama −

Claims (1)

[Claims] (1) In a radio telephone device equipped with an angle modulator that modulates a signal to be modulated by adding it to a phase-locked loop, when the radio telephone device itself is in standby reception with power being supplied, the angle modulator is A wireless telephone device characterized in that the supply of power is stopped.