JPH05130574A - Television signal conversion device - Google Patents

Abstract

PURPOSE:To output a signal which is inputted at the same time by switching the high definition television signals of two systems, and converting one signal to a standard television signal and outputting it. CONSTITUTION:The high definition television signals which are inputted from an external BS tuner are inputted to input terminals A and B and a switching circuit 3 selects one of them. Then the selected signal is converted by a signal processing circuit 11 into the current standard television signal, which is outputted from a terminal C. Thus, the circuit 3 selects and converts one of the high definition television signals into the current standard television signal, and the inputted signal is outputted at the same time. Thus, a connection with external equipment is smoothly made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to MUSE which is a plurality of input high definition television signals (MUSE signals).
(Multipul Sub Nyquist Sam
plc Encoding signal is selected and NTSC (National Television), which is the current standard television signal, is selected.
l Television System Commi
The present invention relates to a television signal conversion device having a function of converting a signal into a Ttee signal and outputting a signal input at the same time as it is.

[0002]

2. Description of the Related Art In recent years, as a high-definition television transmission system, a transmission different from the current standard television signal (NTSC signal), which is a conventional television signal, such as a MUSE signal for transmitting one image by sampling four fields. The system television signals have been developed and used. As a result, high definition television signals (MUSE
It has become necessary to convert a signal) into a current standard television signal (NTSC signal) and reproduce it on a conventional television receiver.

A conventional television signal converter will be described below. FIG. 3 shows a schematic block diagram of a conventional television signal converter. In FIG. 3, 1
Is an external BS (Broadcasting Satellite)
A signal processing circuit for converting a high-definition television signal (MUSE signal) input from a tuner (not shown) through a terminal A into a current standard television signal (NTSC signal), 2 is input through a terminal A. A high-definition television signal (MUSE signal) is output from the terminal B as it is as a buffer circuit, and the terminal C connects the current standard television signal (NTSC signal) output from the signal processing circuit 1 to an external monitor (not shown). It is a terminal for doing.

The operation of the television signal converter having the above-described structure will be described below. In FIG. 3, a high-definition television signal (MUSE signal) input from an external BS tuner is input from an input terminal A, and the signal processing circuit 1 outputs a current standard television signal (N
The high-definition television signal (MUSE signal), which is converted into a TSC signal) and output to an external monitor through the terminal C, and at the same time is input from the input terminal A, has its output enhanced by the buffer circuit 2, It will be output to the device.

[0005]

However, in the above-mentioned conventional television signal converting apparatus, when there are two or more external BS tuners, a high-definition television signal (MUSE) is used.
There is a problem that an arbitrary high-definition television signal (MUSE signal) cannot be selected because there is only one system of (signal) input terminal.

The present invention solves the above-mentioned problems of the prior art by providing a plurality of input high definition television signals (MUSE).
It is an object of the present invention to provide a television signal conversion device having a function of selecting a signal) with a simple structure, converting it into a current standard television signal, and outputting a signal input at the same time as it is.

[0007]

In order to achieve the above object, a television signal converter of the present invention inputs a high-definition television signal (MUSE signal) and converts it into a current standard television signal (NTSC signal). A signal processing circuit,
A buffer circuit that outputs the input high-definition television signal (MUSE signal) as it is, and another high-definition television signal (MUSE signal) that is input to obtain a high-definition television signal (MUSE signal) of 2 systems. A switching circuit for selecting one of them is provided.

[0008]

Therefore, according to the television signal converter of the present invention, a high-definition television signal (MUSE signal) is obtained.
It has a function of inputting and selecting a plurality of signals, converting them into NTSC signals which are the current standard television signals, and outputting the signals input at the same time as they are.

[0009]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, parts common to those of the conventional example shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. Reference numeral 3 selects a high-definition television signal (MUSE signal) input from an external BS tuner (not shown) through a terminal D and a high-definition television signal (MUSE signal) from a terminal A, and a signal processing circuit 1 It is a switching circuit for outputting to.

The operation of the television signal converter having the above structure will be described. High-definition television signal (MUS
E signal) is input from the input terminal A, and similarly, a high-definition television signal (MUSE signal) is also input from the input terminal D, and either one is selected by the switching circuit 3, and the signal processing circuit 1 uses the current standard. Television signal (NT
(SC signal) is converted and output to the external monitor through the terminal C. At this time, a high-definition television signal (MUSE signal) input through the terminal A is output from the buffer circuit 2 through the terminal B to the outside.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG.

In FIG. 2, the same parts as those of the first embodiment and the conventional example shown in FIGS. 1 and 3 are designated by the same reference numerals and their detailed description will be omitted. In this configuration, the high-definition television signal (MUSE signal) is input to the buffer circuit 2 from the incoming terminal A and the input terminal D, and 4 is a switching circuit that selects the output of the buffer circuit 2. is there.

The operation of the television signal converting apparatus of the second embodiment having the above configuration will be described.

A high-definition television signal (MUSE signal) input from an external BS tuner is input from an input terminal A, and a high-definition television signal (MUSE signal) is also input from an input terminal D, and switching is performed. Either one is selected by the circuit 3 and converted into the current standard television signal (NTSC signal) by the signal processing circuit 1 and the terminal C is selected.
Will be output to an external monitor through. Further, at this time, a high-definition television signal (MUSE signal) input through the terminals A and D is input to the switching circuit 4 by being urged to the buffer circuit 2, one of which is selected and output to the outside through the terminal B. become.

[0016]

As described above, a plurality of high-definition television signals (M
USE signal) is selected and converted into a current standard television signal, and a function to output the input signal at the same time is provided as it is, whereby connection with an external device becomes smooth.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a television signal converter according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram of a television signal conversion device according to a second embodiment of the present invention.

FIG. 3 is a schematic block diagram of a conventional television signal conversion device.

[Explanation of symbols]

1 signal processing circuit 2 buffer circuit 3 switching circuit 4 switching circuit A input terminal for high-definition television signal (MUSE signal) B input terminal for current standard television signal (NTSC signal) C output terminal for external monitor D high-definition television Signal (MUSE signal) input terminal

Claims (2)

[Claims] 1. A signal processing circuit for inputting a high-definition television signal (MUSE signal) and converting it to a current standard television signal (NTSC signal), and outputting the inputted high-definition television signal (MUSE signal) as it is. A buffer circuit and a switching circuit for inputting another high-definition television signal (MUSE signal) and selecting one of the two high-definition television signals (MUSE signals). A high-definition television signal (MUSE signal) is switched, and either one is converted into a current standard television signal (NTSC signal), and a function for outputting the converted signal is provided. 2. A buffer circuit which outputs a high-definition television signal (MUSE signal) as it is, and a switching circuit for selecting one of the two-definition high-definition television signal (MUSE signal). A high-definition television signal (MUSE signal) is switched, either one is converted into a current standard television signal (NTSC signal) and output, and either one is output as it is. 1. The television signal converter according to 1.