JPH01252028A - Radiotelephony system - Google Patents

Abstract

PURPOSE:To reduce current consumption by stopping power supply to an angle modulator at the time of waiting reception even when a power source is supplied to a telephone system main body to the angle modulator which adds and modulates a modulating signal to a phase synchronizing loop. CONSTITUTION:When the radiotelephony system main body is in a turning-on condition and a wait receiving condition and a call operating or incoming signal is recognized by a control part 7, a switch 6 is turned on and the power source is supplied to an angle modulator 3. Simultaneously, a timer is set and when a prescribed time lapses, a switch 2 is turned on and the modulating signal is inputted to the angle modulator 3. Thus, an access signal is transmitted through an input terminal 1, the switch 2, the modulator 3, a power amplifier 4 and an antenna 5 to a base station, which is not shown in a figure, and normal calling is executed. After that, when the calling is ended, a signal to turn off the power source of the modulator 3 is outputted from the control part 7 and the switches 6 and 2 are turned off. Then, only the modulator 3 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a radio telephone device such as a car telephone 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 radio 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 also turned on.
There was a problem in that the modulator operated even when not transmitting, and the current consumption increased during standby. This has an impact on the problem that when operating on a battery, such as a portable radio telephone device, the battery usage time is shortened.

For this reason, it may be possible to control the modulator so that it is not powered on in conjunction with the timing of transmission, that is, in standby mode when no transmission is performed.

(Issue 8 to be solved by the invention) However, since it takes a predetermined time for the phase-locked loop that constitutes the modulator to establish synchronization with the frequency to be transmitted, it is necessary to synchronize with the transmission timing as described above. If you control the power supply to the modulator by controlling the power supply to the modulator, the modulation operation will be performed before the phase-locked loop starts up, which may cause malfunction of the modulator or cause problems such as unnecessary waves being radiated. arise.

The present invention has been made based on the above circumstances, and provides a wireless telephone device that can reduce the current consumption during standby, when the modulator is inactive, without causing any problems. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a radio telephone device equipped with an angle modulator that adds and modulates a signal to be modulated in a phase-locked loop. , in a standby state in which power is supplied to the main body of the wireless telephone device, at the time of reception, the power supply to the angle modulator is stopped, and at the time of starting transmission, power is supplied to the angle modulator, and at least the angle modulation is performed. The present invention is characterized in that the signal to be modulated is added to the phase-locked loop after a period of time for establishing phase locking of the phase-locked loop constituting the device.

(Function) According to the present invention, the power supply to the angle modulator is stopped during reception when the wireless telephone device is in standby mode while power is being supplied to it. The current consumption can be significantly reduced when the receiver is turned on.

In addition, since power is supplied to the angle modulator at the start of transmission and the signal to be modulated is added to the phase-locked loop after a predetermined period of time, the modulator may malfunction or unnecessary waves may be radiated. The problem will disappear.

(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 into which a signal to be modulated is input, 2 is a switch, and 3 is an angle modulator composed of a phase locked loop. Also, 4 is a power amplifier (PA), 5
6 is an antenna, 6 is a switch for controlling the power supply to the angle modulator 3, and 7 is a control unit (LOG).

The angle modulator 3 includes an oscillator 31 and a phase comparator (PD) 32
, a low pass filter (LPF) 33, an adder 34, a voltage controlled oscillator (VCO) 35, and a frequency divider (1/N) 36, and the signal to be modulated output from the input terminal 1 described above is FM modulated. If so, the signal is input to an adder 34 provided between the low-pass filter 33 and the voltage-controlled oscillator 35.

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. The control unit 7 controls the on/off switching timing of the switch 2 and the switch 6.

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

First, when the wireless telephone device is in the on state, the standby mode is activated by a user operation (calling operation) (step 1), such as when the handset is off-hook or when a dial button is operated, or when an incoming signal is received. When the control unit 7 recognizes (step 2), the control unit 7 turns on the switch 6 and supplies power to the modulator 3 (step 3).
) and set a timer (T seconds) (Step 4)
.

After T seconds have passed (step 5), the control unit 7 turns on the switch 2 (step 6), and inputs the signal to be modulated into the modulator 3.

This allows the access signal to be sent to input terminal 1, switch 2,
The signal is transmitted to a base station (not shown) via the modulator 3, power amplifier 4, and antenna 5 (step 7), and thereafter, a normal telephone conversation is performed.

Note that the above-mentioned T seconds is set to a value larger than the time required for the phase-locked loop forming the modulator 3 to establish synchronization.

After this, an operation such as putting the handset on-hook (call termination) is performed (step 8), and when a signal accompanying this operation is output to the control unit 7, the power supply to the modulator 3 is turned off and modulation is started. The switch 6 and the switch 2 are turned off by the control unit 7 so as to stop the output signal (
Step 9).

In this embodiment, as described above, the switch 6 is set to turn off the power to the modulator 3 during reception when the main body of the wireless telephone device is powered on and no transmission is being performed. is turned off, making it possible to significantly reduce current consumption during standby mode.

In addition, since the signal to be modulated is added to the modulator 3 after the synchronization of the phase-locked loop that constitutes the modulator 3 is established, problems such as the modulator 3 malfunctioning and unnecessary waves being radiated can occur. will disappear.

Note that in the embodiment described above, the signal to be modulated is
In the case of modulation, the signal is input to the adder 34 provided between the low-pass filter 33 and the voltage controlled oscillator 35, but in the case of PM modulation, the signal is input to the phase comparator 32.
An adder 34 may be provided between the input signal and the low-pass filter 33, and the signal may be input to the adder 34 for PM modulation.

[Effects of the Invention] As explained above, the radio telephone device of the present invention can reduce the current consumption without any problem during standby mode in which 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...Control unit Applicant Toshiba Corporation Agent Patent attorney Sasa Suyama - Figure 2

Claims (1)

[Claims] In a radio telephone device equipped with an angle modulator that adds and modulates a signal to be modulated to a phase-locked loop, the angle is Stop the power supply to the modulator, and at the start of transmission, supply power to the angle modulator, and at least after the time period for establishing phase synchronization of the phase-locked loop constituting the angle modulator has elapsed, the phase A radio telephone device characterized in that the signal to be modulated is added to a synchronous loop.