JPH0563669A - Transmission system for synchronizing signal - Google Patents

Abstract

PURPOSE:To attain multiplexing and transmission of a carrier synchronizing signal onto a stereo signal through a stereo signal transmission line. CONSTITUTION:This system consists of a transmission section comprising a distributer 2 distributing a carrier synchronizing signal (c) outputted from a reference signal generator 1, an audio multiplexer 3 and a stereo matrix circuit 4 used to multiplex and transmit the distributed carrier synchronizing signal (d) and stereo signals a, b, and of a reception section comprising a stereo matrix circuit 7 used to demultiplex the sent signal, a low pass filter 8 and a band pass or a high pass filter 9. Thus, an existing stereo transmission line 6 is used to easily multiplex/demultiplex the carrier synchronizing signal (c) on/from the stereo signals a, b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereo signal transmission circuit, and more particularly to a transmission system having a function of multiplexing carrier wave synchronizing signals for performing medium-wave synchronous broadcasting.

[0002]

2. Description of the Related Art Carrier wave synchronizing signals have not been multiplexed in conventional stereo signal transmission lines.

[0003]

There has been a problem that a carrier line synchronizing signal has not been multiplexed in a stereo signal transmission line in the related art, so that a new transmission line must be added.

[0004]

According to the present invention, there is provided a synchronizing signal transmission system comprising a distributor for multiplexing a carrier synchronizing signal for medium-wave synchronous broadcasting on a stereo signal transmission line, an audio multiplexer and a stereo matrix circuit. , Equipped with a filter for separation.

[0005]

The present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram of an embodiment of the present invention. The carrier synchronizing signal c output from the reference signal generator 1 is a distributor 2
Audio signal (L) distributed by the d audio multiplexer 3
a and the audio signal (R) b.

The multiplexed signal e and the multiplexed signal f output from the audio multiplexer 3 are the audio signal a within the stereo signal transmission band s, as shown in the diagram showing the frequency arrangement of the multiplexed signals e and f in FIG.
Alternatively, the carrier synchronization signal d is multiplexed with b and outputted, and inputted to the stereo matrix circuit 4, respectively, and converted into the sum signal g and the difference signal h. The sum signal g and the difference signal h are voice distributed 5
Are distributed in accordance with the number of stations performing medium-wave synchronous broadcasting, and the sum signal i and the difference signal j are input and transmitted to the stereo transmission line 6, respectively.

The sum signal i and the difference signal j transmitted by the stereo transmission line 6 are converted into a multiple signal k and a multiple signal 1 by a stereo matrix circuit 7, respectively, and are converted into audio signals m and n by a low-pass filter 8 respectively. Alternatively, the high-pass filter 9 separates the carrier wave synchronization signal c and the carrier wave generator 10 outputs the carrier wave p synchronized with the carrier wave synchronization signal c.

The AM stereo exciter 11 inputs a voice signal q and a carrier wave r into the medium-wave broadcasting machine according to the input voice signals m and n and the carrier wave or the reference signal p, respectively.
The stations B and B can perform AM stereo synchronous broadcasting in synchronization with the carrier wave synchronization signal c.

[0010]

As described above, the present invention provides a distributor / voice multiplexer for multiplexing a carrier synchronizing signal into a stereo signal, a low pass filter for separating from a stereo matrix circuit, a band or high pass filter. By adding a device, there is an effect that the carrier synchronization signal can be easily multiplexed and separated in the conventional stereo transmission line.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a frequency array of multiplexed signals e or f.

[Explanation of symbols]

 1 Reference Signal Generator 2 Distributor 3 Audio Multiplexer 4 Stereo Matrix Circuit 5 Audio Distributor 6 Stereo Transmission Line 7 Stereo Matrix Circuit 8 Low-pass Filter 9 Band or High-pass Filter 10 Carrier Generator 11 AM Stereo Exciter 12 Medium Wave broadcaster a Audio signal (L) b Audio signal (R) c and d Carrier wave synchronization signal e Multiplex signal (a + d) f Multiplex signal (b + d) g Sum signal (a + b + c) h Difference signal (a−b + (c / 2) -C / 2)) i sum signal j difference signal k multiplexed signal (g + h = 2a + c) l multiplexed signal (gh = 2b + c) m audio signal (a) n audio signal (b) o carrier synchronization signal p carrier or reference Signal q voice signal r carrier s stereo signal transmission band

Claims (1)

[Claims] 1. A stereo signal transmission line is provided with a distributor for multiplexing a carrier wave synchronization signal for medium-wave synchronous broadcasting, an audio multiplexer and a stereo matrix circuit, and a filter for separation. And the synchronization signal transmission method.