JPS6297440A - Television synchronizing broadcast equipment - Google Patents

Abstract

PURPOSE:To facilitate synchronizing broadcast even when a reception station and a transmission station are separated by separating a synchronizing broadcast equipment into the reception section and the transmission section and sending a synchronizing signal together with an IF signal via a transmission line between them. CONSTITUTION:A part of a signal received by a receiver 2 in the reception station is extracted, it is used as a reference signal 7 and inputted to a synchronizing broadcast signal adaptor 12, which synthesizes the frequency and the result is outputted as a synchronizing signal 13. The synchronizing signal 13 is synthesized with an output IF signal 17 of the receiver 2 by a synthesizer 11 and sent to a transmission station through a transmission line 14. In the transmission station, a branching filter 15 branches the synthesized signal into an IF signal 18 and a synchronizing signal 16, the IF signal 18 is inputted to a transmitter 4, and sent, and the synchronizing signal 16 is inputted to a synchronizing broadcast signal adaptor 19, where the signal is subjected to phase comparison with a comparison signal 8 extracted from an output signal 5 and its output signal 10 controls a local oscillator 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synchronized broadcasting device for television relay broadcasting.

[Conventional technology]

FIG. 2 shows a conventional synchronous broadcasting device of this type. In the figure, (1) is the received input signal, (2) is the receiver,
(3) is a transmitter that converts and amplifies the IF multiplied signal (4 (IF multiplied signal 3) which is the output of the receiver (2) as a transmission output signal fζ, and 15) is the output signal of the transmitter (4). , (6) is a synchronous broadcasting device, and (7) is a reference signal that is a frequency reference source for synchronous broadcasting.
6) Outputting to a synchronous broadcasting device. (8) is the transmitter (4
) is extracted from a part of the output signal (5) of the synchronous broadcasting device (6).
0ze feedback comparison signal, (9) is a local oscillator (hereinafter simply referred to as local oscillator) of the transmitter (4), and al is a control voltage signal that controls the output frequency of the local oscillator (9).

Next, the operation will be explained. The receiver (2) converts the received input signal (1) into an IF signal (3). Furthermore, this IF signal +31 is transmitted as a transmitter (from 4 days onwards, it is converted to a transmission frequency, amplified and output signal 15). The frequency conversion of the transmitter (4) is performed by converting the local frequency of the local oscillator (9) and the I
This is done from the F-multiply signal 3) and 1 above, but it is assumed that this local oscillator (9) has a voltage controlled crystal oscillator (hereinafter referred to as VC/TCXO). On the other hand, a part of the received input signal (1) is extracted from the receiver +21 and inputted as a reference signal (7) to the synchronous broadcasting device +6. Also, a part of the output signal (5) is taken out and inputted as a comparison signal (8). Inside the synchronous broadcasting device (6), the reference signal (7) and the comparison signal (8) are compared in phase, and the comparison output is sent to the control voltage signal port α.
As, the received input signal (
It is possible to synthesize an output signal (5) that follows the frequency stability of 1).

[Problems to be Solved by the Invention] The conventional synchronous broadcasting device has the above-mentioned configuration. However, in the television relay station Iζ, there is a problem that it cannot be used in the distribution box 1, where the receiving station where the receiving antenna and receiver are installed and the transmitting station where the transmitter and transmitting antenna are installed are separated. there were.

This invention has been made to solve the above-mentioned problems, and aims to obtain a synchronized broadcasting bag (a) that can easily perform fζ synchronized broadcasting even in a distribution box.

[Means for solving problems]

The synchronous broadcasting device according to the present invention (ζ) is such that the receiving side and the transmitting side of the synchronous broadcasting device are separated, and the synchronous signal as well as the IF multiplied signal is transmitted between them via a transmission line.

[Effect]

The receiving side device in this invention extracts and generates a synchronization signal from the received human input signal. Transmits and outputs a transmission output signal.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In FIG. 1, (1) is a received input signal, (21 is a receiver,
(171 is a receiver (IF multiplied signal 7 which is the output of 21), a part of the received human input signal is taken out at the receiver (21), tco reference signal, nz is a synchronous broadcast reception addition device, 113 is this reception addition The synchronization signal output from device J, ua, (I
ll is a synthesizer that combines the synchronization signal 111 and the IF multiplied signal 171, 041 is a transmission line from the receiving station to the transmitting station, (j5)
is a splitter that takes out the synchronization signal and the IF multiplied signal, (16) is the splitter (synchronization signal taken out by 151, +181 is the splitter (IF multiplied signal (4) taken out from 1ωCζ is the transmitter, 5) is the output signal of the transmitter (4), t9+ is the local oscillator of the transmitter (4), and q is the control voltage signal that controls the output frequency of the local oscillator (9). (1ω is the synchronous broadcast transmission addition The device (8) is a comparison signal that takes out a part of the output signal (5) of the transmission diagram (4) and returns it to the synchronous broadcast transmission additional device.

In such a configuration, at the receiving station, the reception input signal (1) is received from the second receiver, and the receiver internal fζ extracts a part of this signal and converts it into the reference signal ( In the synchronous broadcast receiving additional device u which inputs the synchronous broadcast receiving additional device port Cζ as 7), a certain frequency (for example, IMH2 or IOMI
(Z) and outputs it as a synchronous signal @11. Of course, this synchronization signal 1131 can be synthesized as one that follows the frequency stability of the received input signal (1).

This synchronization signal 113) is the output IF signal of the receiver (2)
+171 and synthesizer till, and transmission line 1
14) It is sent to the 111th place by a through-no.

At the transmitting station -C, this composite signal is first sent to the demultiplexer 1.
From 1511, IF double signal old and synchronization signal 11fil
The IF signal @ +181 which is separated by lζ is input to a transmitter (4), frequency converted and amplified, and transmitted as an output signal (5).

On the other hand, the synchronization signal 116) is transmitted by the synchronization broadcast transmission additional device 09
is input. Also, take out a part of the output signal (5),
A comparison signal (81 is inputted as Illζ. In the synchronized broadcast transmission additional device tall, the phase of the comparison signal (8) is compared using the synchronization signal U■ as a reference, and the comparison output is used as the control voltage signal OI to transmit the local oscillator (9). )'s VC/TCXO.

In this way, it is possible to create a transmission frequency that follows the frequency stability of the synchronization signal (161. In other words, the synchronization signal 1
By superimposing 1[9 on the transmission line III, it is possible to transmit an output signal (51) that follows the frequency stability of the received input signal (1).

In the above embodiment, a combiner (1υ) and a demultiplexer +151 were used to superimpose the signal on the IF doubler Uη, but of course a separate transmission line may be provided.Also, the frequency of the synchronization signal (13) may be different from the high frequency. However, if the frequency is divided to, for example, 25i (H7), the separate transmission line does not need to be a coaxial cable, and an electric wire can also be used.

〔Effect of the invention〕

As described above, EζAccording to this invention, the receiving side and the transmitting side of the synchronous broadcasting device are separated, and they are connected by a transmission line.
Becomes Noh.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a television synchronous broadcasting apparatus according to an embodiment E of the present invention, and FIG. 2 is a system diagram of a conventional television synchronous broadcasting apparatus. In Figure Cζ, (2) is the receiver, (4) is the transmitter, and (9
) is a local oscillator, (11) is a combiner, (121 is a synchronous broadcast reception additional device, 05) is a branching type, and t19) is a synchronous broadcast transmission addition device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] The received TV signal is converted into an IF signal by the receiver, and this IF signal is converted by the transmitter into a transmitted TV signal having frequency stability equal to the carrier wave of the received TV signal, amplified, and transmitted. In a television synchronized broadcasting device for television relay, the reception T is transmitted to the receiver side.
A synchronizing signal extracting means extracts and generates a synchronizing signal serving as a reference for frequency stability from the V signal, and a synthesizing means weight-synthesizes the synchronizing signal extracted and generated by the extracting means with the IF signal and sends it to the transmission line. , on the other hand, separating means for separating and outputting the IF signal and synchronization signal transmitted via the transmission path to the transmitter side; A television synchronized broadcasting apparatus characterized by comprising comparison control means for comparing and controlling the local oscillation frequency of the transmitter according to the comparison output.