JPS58219843A - Signal transmitter - Google Patents

Abstract

PURPOSE:To make electric power consume in accordance with the transmitting capacity of a signal to be transmitted, by supplying electric power to a power amplifier circuit only for a period including the time intervals during which a carrier signal modulated by the signal to be transmitted is to be transmitted. CONSTITUTION:A continuous modulated carrier 5 is bursted by an ON/OFF controlling signal 7 in an amplitude modulator 30. The ON/OFF controlling signal 7 is converted into another ON/OFF controlling signal 33 so as to include a burst-like modulated carrier 31 on the time axis while the ON period of a power supply by a waveform converting circuit 32. In accordance with the ON/ OFF controlling signal 33, a power supply line 22 is switched by an ON/OFF switching circuit 20 to supply electric power to a signal power amplifier circuit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a first device that modulates a carrier signal with a first signal to be transmitted and continuously transmits the modulated carrier signal; Regarding a multiplex communication system that performs mutual communication with a plurality of second devices that modulate a carrier string signal with a signal and intermittently send out the modulated carrier wave signal, in particular, The present invention relates to a signal transmitting device included in an apparatus.

A typical example of the above-mentioned multiplex communication system is a two-time division multiplex digital signal multidirectional multiplex communication system.

As shown in FIG. 1, a time-division digital signal multidirectional multiplex communication system consists of one first device M (hereinafter referred to as a master station device) and a plurality of second devices A, B, O, D.
', E (hereinafter referred to as a slave station device) is a system that enables simultaneous communication.

In this system, the master station uses a time-series multiplexed signal (Tim
e Divfsion Multiplexed Si
gnal (hereinafter referred to as TDM signal) is radially transmitted by a wide beam antenna. In addition, similar signals are sent from the slave stations in bursts as shown in Figure 2 A, B, C, D, and E, and the signals do not overlap each other in the master station receiving section.
It is as if the signal sent from one transmitting device was received.

In this way, simultaneous communication between one master station device and a plurality of slave station devices is made possible.

The basic configuration of a conventional signal transmitting device provided in a slave station device in this communication system is schematically shown in FIG.

In FIG. 3, input signal 1 is a TDM signal in which signals to be transmitted are time-division multiplexed. This signal 1 modulates a carrier signal 3 generated by a carrier signal generator 4 in a modulator 2 .

The output signal 5 of the modulator 2 is turned on and off at a desired period and time by a signal on/off control signal 7 in a signal on/off circuit 6 (or an amplitude modulation circuit).
A burst-like signal 8 such as is generated. This signal 8
is amplified by the signal power amplification circuit 9, and the amplified burst signal 10 is sent out to the master station via the antenna 11.

In this figure, a line 12 indicates a power supply line from a power supply circuit 14 having a positive or negative polarity for operating the signal power amplification circuit 9.

The power amplification circuit 9 is always supplied with power from the power supply line 12 to the signal power amplification circuit 9, even though the signal to be actually amplified and transmitted is an intermittent multiple signal like A shown in FIG. has been done.

For this reason, conventional signal transmitting devices for slave station devices.

Similar to the case where the master station device transmits a signal as shown in M in FIG. 2, there is a drawback that power is constantly consumed during operation of the device. Furthermore, as a result, there is also a drawback that the reliability of the circuit elements deteriorates due to the amount of heat consumed.

An object of the present invention is to provide a signal transmitting device for a slave station device that eliminates the above-mentioned drawbacks.

The signal transmitting device of the present invention includes a power supply control circuit (corresponding to 20 in FIG. 4 and a circuit including 20 and 62 in FIG. 5) that intermittently controls the power supply to the power amplifier circuit 9. ), and the power supply control circuit has:
Power is supplied to the transmitting amplifier circuit 9.

It is characterized by control.

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 4, there is shown a signal transmitting device for a slave station device according to a first embodiment of the present invention.

In this embodiment as well, as in the case of FIG. The signal is amplified and sent to the master station via the antenna 11. The difference between the signal transmission device of this embodiment and the conventional device is that in order to convert the modulated carrier wave signal 5 into a burst signal, the power supply line 12 to the signal power amplifier circuit 9 is turned on and off in the on/off switching circuit 20. , based on the control of the signal on/off control signal 7.

In this way, by intermittent power supply to the signal power amplifying circuit 9 using the on/off control signal 7, a modulated burst signal as shown in FIG. 2, for example, A is obtained. The amplifier circuit 9 does not consume power. Since the power consumption is determined in proportion to the burst signal transmission time, that is, the amount of signal information to be transmitted, it is sufficient that the circuit performance corresponds to the functions that the nine circuits should perform.

The configuration shown in FIG. 4 shows the simplest embodiment of the present invention, and with such simple signal on/off control, the burst-like modulated carrier wave signal 10 becomes as shown in FIG. , the transient waveform when the signal is turned on and off cannot be sufficiently controlled, and the spectrum of the signal 10 may be spread, or the waveform may continue to be disturbed when it is turned off, which may cause interference with other slave station burst signals.

In such a case, a configuration as shown in FIG. 6 can be considered as a configuration of the signal transmitting device for the slave station device. The signal transmitting device for a slave station device according to the second embodiment of the present invention shown in FIG. 6 transmits continuous modulated carrier waves 5 as shown in FIG.
In the amplitude modulator 30, the modulated carrier wave is bursted by an on/off control signal 7 having a waveform as shown in FIG. This signal is shown in FIG. 731. and,
The on/off control signal 7 is converted by the waveform conversion circuit 32 as shown in FIG. 733.

A burst modulated carrier wave 31 is generated when the power is turned on.

It is converted into another on/off control signal 33 that includes on the time axis. This on/off control signal 33 controls switching of the power supply line 12 in the on/off switching circuit 20 . In this way, the power consumption in the signal power amplification circuit 9 has the same effect as the configuration shown in FIG. By controlling the waveform of the on/off switching circuit 20, it is possible to perform good waveform control.

As explained above, according to the present invention, it is possible to configure the signal power amplifier circuit 9 which consumes power according to the amount of signal transmission to be transmitted, and at the same time reduces the power consumption of the signal transmitter. This has the advantage of improving reliability.

It goes without saying that the present invention also includes modifications to the above-mentioned embodiments. for example.

Regarding the input signal 1 in FIGS. 4 and 6, various signal configurations can be considered in addition to a double signal configuration.
,

[Brief explanation of the drawing]

Figure 1 is a diagram showing the configuration of a time-division digital signal multidirectional multiplex communication system, and Figure 2 shows the temporal relationship of signals sent from the master station device M, slave station devices A, and E in Figure 1. figure,
FIG. 6 is a block diagram showing a conventional signal transmitting device provided in the slave station device of FIG. 1, and FIG. 4 shows a signal transmitting device for the slave station device according to the first embodiment of the present invention. FIG. 5 is a waveform diagram showing the signal 10 of FIG. 4, and FIG. 6 is a block diagram showing a signal transmitting device for a slave station device according to a second embodiment of the present invention. FIG. 7 is a waveform diagram showing signals 5, 7, 31, and 33 in FIG. 2...Modulator, 4...Carrier signal generator, 6...
Signal on/off circuit, 9... Signal power amplification circuit, 11.
... Antenna, 12... Power supply line, 14... Power supply circuit, 20... On/off switching circuit, 60... Amplitude modulator, 32... Waveform conversion circuit. 'Figure 1 - Figure 2 Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] 1. Modulating a carrier signal with a first signal to be transmitted;
one first transmitting the modulated carrier signal continuously;
and a plurality of second devices that modulate a carrier wave signal with a second signal to be transmitted and intermittently transmit the modulated carrier wave signals, in a multiplex communication system that performs mutual communication. The signal transmitting device included in the second device includes a power amplifying circuit that amplifies the power of a carrier signal modulated by the second signal to be transmitted, and a power that intermittently controls power supply to the power amplifying circuit. It has a supply control circuit. A signal transmitting device characterized in that the power supply control circuit controls so that power is supplied to the second width circuit to be transmitted.