JPS62221227A - Signal transmission system - Google Patents

Abstract

PURPOSE:To make a timer circuit, which sets the operation time of a repeating transmission means, unnecessary by setting the call signal transmission time of a transmitter to a value slightly longer than the sum of the interval of interrupted reception of a repeater and that of a receiver. CONSTITUTION:A transmission time t1 of the call signal in a transmitter 1 is made slightly longer than the sum of an interval t2 of interrupted reception of a repeater 3 and an interval t3 of that of a receiver 2. Even if the call signal is transmitted just after the end of the interrupted reception period of the repeater 3 and a transmission time t4 of the repeated call signal transmitted from the repeater 3 is t1-t2, the repeated call signal is detected surely by the receiver 2 because the transmission time t4 is slightly longer than the interval of interrupted reception of the receiver 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a signal transmission system that transmits signals between a transmitter and a receiver via a repeater.

[Background Art] Conventionally, this type of signal transmission system, in which signals are transmitted between a transmitter and a receiver via a repeater, continues for a certain period of time t1 when a call switch is pressed. a transmitter equipped with a transmitting means for transmitting a calling signal;
y4: A relay comprising a relay receiving means that operates intermittently for a short period of time at fixed time intervals t2 to check the calling signal, and a relay transmitting means that transmits a relay calling signal that continues for a fixed time t4 when the calling signal is detected. and a receiver having 3% receiving means for checking a relay paging signal by operating for a short period of time at regular time intervals, and an annunciation means for notifying a paging detection when a relay paging signal is detected. It was configured. By the way, as mentioned above, the reception
In the conventional example in which the receiving means of the transmitter and the repeater are operated intermittently to reduce power consumption, it is necessary to set the transmission time tl@t4 in consideration of the intermittent reception interval h*h, and the transmitter It is necessary to provide a timer circuit for setting the transmission time t+vt4 of each call signal in the repeater. The device requires a timer circuit for setting the intermittent reception interval L2 and a timer circuit for setting the transmission time, complicating the circuit configuration and making it troublesome to set the transmission and reception timing.

[Objective of the Invention 1 The present invention has been made in view of the above points, and its purpose is to reduce the power consumption of the repeater as much as possible, and to simplify the circuit configuration of the repeater. An object of the present invention is to provide a signal transmission system in which transmission and reception timing can be easily set.

[Disclosure of the Invention] (Embodiment) Fig. 1 shows a schematic configuration of an embodiment of the present invention, which includes a transmitting means that continuously transmits a calling signal for a certain period of time t1 when the calling switch SW is pressed. , a transmitter 1 equipped with a transmitter 1, a relay receiving means that operates intermittently for a short time at fixed time intervals t2 to check the calling signal, and a relay receiving means that transmits the relay calling signal from when the calling signal is detected until the calling signal is no longer detected. a repeater 3 equipped with a relay transmitting means for transmitting, a receiving means for operating for a short period of time at fixed time intervals t to check the relay paging signal, and a notification for notifying the detection of a paging when a relay paging signal is detected. It consists of a receiver 2 equipped with means, t, ri, + t,
It is set to be slightly larger than . In the embodiment, the transmitter 1 and the uplink receiver 2 are integrated to form the transmitter/receiver A and B, and the repeater 3 has uplink and uplink receivers.
A relay reception means and a relay transmission means are provided for the downlink M, and the transmission and reception frequencies f, , f2 of the transceiver A and the transmission and reception frequencies jlkr3-f4 are set to different frequencies. Further, a DC power source E is applied to the transceivers A and B via a power control path 6'.

FIG. 2 is a circuit diagram showing a specific configuration example of the repeater 3, in which an uplink relay circuit 4a and a downlink relay circuit 4b are arranged in parallel, and each relay circuit is controlled by an intermittent timing generation circuit 5 and a power supply control circuit 6. The relay circuits 4a and 4b, which control the operation of the relay receiving means and the relay receiving means of 4 at 4 b, include filters F, -F, RF amplifier AMP, and crystal oscillation circuit X. O
l-X 02, multiplier circuit X1, X! , mixer MX,
, MX, , IF amplifier AMP2, carrier detection circuit CD
, RF output circuit OUT, crystal oscillation circuit XO, multiplier circuit X+, and filter Fs form a local oscillation circuit for receiver 6.
2. Transmission station f with multiplier circuit X2 and V filter F
f1s5i! A vibration circuit is formed. The circuit configuration and basic operation of both relay circuits 4at4b are completely the same, and only the operation timing and operation frequency are different, and the operation frequency of each part is as indicated in the figure.

The operation of the embodiment will be described below with reference to FIG.

Now, when the call switch SW of one transceiver A is pressed and an on-pulse as shown in FIG. 3(a) is obtained, the transmitting means of the transmitter 1 operates for a fixed time t1, As shown in b), the uplink relay circuit 4 of the repeater 3 transmits the calling signal continuously for a certain period of time t1.
The relay receiving means a performs short-term absenteeism at fixed time intervals t2 as shown in FIG. When a paging signal is detected, the relay transmission means is immediately activated to transmit a relay paging signal until the paging signal is no longer detected, as shown in FIG. 3(d). . Next, the receiving means of the receiver 2 operates for a short time at fixed time intervals t as shown in FIG. 3(e) to check the relay paging signal, and when the relay paging signal is detected, The notification means for notifying the detection of a call is operated, and the
), a notification sound is generated to notify that there is a call. Here, in the embodiment, the transmission time t1 of the paging signal in the transmitter 1 is set to the intermittent reception interval L2 of the repeater 3 and the intermittent reception interval t of the receiver 2.
, is set to be slightly larger than the sum of (t2+ts), so the paging signal is transmitted immediately after the end of the intermittent reception period of the relay device 3, and the transmission time of the relay paging signal transmitted from the relay device 3 is Even when L4 becomes tl-2, this transmission time is slightly longer than the intermittent reception interval of receiver 2, so that receiver 2 can reliably detect the relay paging signal. In this case, repeater 3
Since the operating time of the relay transmitting means is set to the minimum necessary, the power consumption of the repeater 3 can be minimized, and there is no need for a timer circuit to set the operating time of the relay transmitting means. The circuit configuration of No. 3 can be simplified, and the transmission/reception timing of the repeater 3 can be easily set.

[Effects of the Invention 1] As described above, the present invention includes a transmitter having a transmitting means that continuously sends out a calling signal for a certain period of time t1 when a calling switch is pressed, and a transmitter that has a value of Jt-, a repeater comprising a relay receiving means that operates intermittently for a short period of time to check the paging signal; and a relay transmitting means that transmits the relay paging signal from when the paging signal is detected until the paging signal is no longer detected; Aperture [,,
and a receiver equipped with a receiving means that operates for a short time to check the relay paging signal and a notifying means that notifies the detection of the paging when the relay paging signal is detected. Since it is set to be slightly larger than , the operating time of the relay transmission means of the repeater can be set to the minimum necessary and the power consumption of the repeater can be reduced as much as possible.
Moreover, since there is no need for a timer circuit for setting the operating time of the relay transmission means, there are advantages in that the circuit configuration of the repeater can be simplified and the transmission and reception timing can be easily set.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of the main part of the same, and FIG. 3 is an explanatory diagram of the operation of the same. SW is a call switch, 1 is a transmitter, 2 is a receiver, and 3 is a repeater.

Claims (1)

[Claims] (1) A certain period of time t_ when the call switch is pressed
a transmitter equipped with a transmitting means that continuously transmits a calling signal for 1 time, a relay receiving means that operates intermittently for a short time at fixed time intervals t_2 to check the calling signal; a repeater comprising a relay transmitting means for transmitting a relay paging signal until the relay paging signal is no longer detected; a receiving means for operating for a short period of time at a fixed time interval t_3 to check the relay paging signal; and when the relay paging signal is detected. and a receiver equipped with a notification means for notifying call detection, and t_1 to t_2+
A signal transmission system characterized in that the signal transmission system is set to be slightly larger than t_3.