JPH04252686A - High grade television receiver - Google Patents

Abstract

PURPOSE:To obtain an appropriate signal processing by providing a deciding means for the kind of an input signal and switching automatically a signal processing mode of the inside, in an EDTV receiver. CONSTITUTION:In a signal processing circuit 27, at the time of MUSE signal processing mode, an input switching circuit 25 selects and leads out the NTSC video signal of progressive scanning, therefore, a Y/C separation, a video processing, a chrominance signal processing, etc., are performed, and R, G and B signals are obtained. Subsequently, they are supplied to a double speed converting circuit 28, but the circuit 28 is switched in advance to a state that the signal is allowed to pass through as it is by a deciding signal J, therefore, these signals are led out to an output terminal 29. On the other hand, when the deciding signal J does not show the MUSE signal processing mode, the circuit 25 selects the interlaced scanning NTSC video signal of an input terminal 24 and supplies it to the circuit 27. In this case, the circuit 27 executes various processings by a clock corresponding to the interlaced scanning. The R, G and B signals obtained thereby are inputted to the circuit 28. In the circuit 28, a double speed conversion processing is executed, and by doubling the number of scanning lines, a signal of progressive scanning is outputted, and it becomes a signal applied to an EDTV screen.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-definition television receiver that is effective when a high-definition television receiver is used in combination with a MUSE/NTSC converter capable of receiving and processing MUSE signals.

0002

[Prior art] High-definition broadcasting in Japan is based on MUSE (
Multiple Sub-Nyqist Samp
A band compression method called a ring encoding method is employed. It is planned that satellite broadcasting will be carried out using this method, but in order to receive this broadcast signal, M
A USE decoder is required. On the other hand, MUSE
A MUSE/NTSC converter has also been developed that receives a NTSC signal and converts it into an NTSC signal that can be played on an NTSC receiver.

FIG. 3 shows the MUSE/NTSC converter 1.
This is a schematic configuration example. M received by BS tuner
The USE signal is sent to the system conversion circuit 32 via the input terminal 31.
is input. The format conversion circuit 32 performs interpolation processing, scanning line number conversion processing, etc. on the MSUE signal and converts it into an NTSC signal. In this case, the interlaced scanning NTSC video signal P
1 and a progressively scanned NTSC video signal P2. Furthermore, the system conversion circuit 32 is provided with an identification function for identifying whether or not a MUSE signal is input from the terminal 31, and outputs a control signal. This control signal is given to the switching circuit 33. When the control signal indicates MUSE signal input, the switching circuit 33 selects the interlaced scanning NT output from the system conversion circuit 32.
SC signal P1 and audio signal S1 are selected and output terminal 35
, 36. When the control signal does not indicate MUSE signal input, interlaced scanning N is output from terminals 37 and 38.
It is determined that a TSC video signal and an audio signal are being input, and these signals are output to output terminals 35 and 36, respectively. The system conversion circuit 32 also has a keyed AFC pulse output terminal 39 for performing keyed AFC in the BS tuner.
can be output to.

FIGS. 4, 5, and 6 are MUSE/N
FIG. 2 is a block diagram showing an example of how the TSC down converter 1 is used. The output from the BS tuner 41 is MUSE/NT
It is guided to the SC converter 1. The combination in Figure 4 is MU
This is an example in which the output from the SE/NTSC converter 1 is supplied to the NTSC receiver 42. The combination in Figure 5 is MU
This is an example in which the output from the SE/NTSC converter 1 is supplied to a high definition television (EDTV) receiver 43. The EDTV receiver 43 receives a progressively scanned NTSC video signal,
Can receive interlaced scanning NTSC video signals,
Video can be played back by switching to either mode. In this case, the processing mode of the EDTV receiver 43 is switched by the user, and when an interlaced scanning NTSC video signal is input, a double speed conversion function for converting to progressive scanning is activated. FIG. 6 shows an example of a combination in which an interlaced scanning NTSC video signal is introduced directly from a BS tuner.

[0005]

[Problem to be Solved by the Invention] In the above-described EDTV receiver, it is possible to automatically determine whether a progressive scanning NTSC video signal or an interlaced scanning NTSC video signal is being output from the MUSE/NTSC converter. I don't have the means. Therefore, the user manually switches the signal processing mode of the EDTV receiver, which is complicated to handle. In addition, there are various problems such as users who are not familiar with how to handle the system may mistake it for a system failure.

Therefore, the present invention provides an EDTV receiver with means for determining the type of input signal, automatically performs the determination, switches the internal signal processing mode, and provides a high-definition system capable of obtaining appropriate signal processing. The object of the present invention is to provide a television receiving device.

[0007]

[Means for Solving the Problems] The present invention is capable of receiving a MUSE system video signal and a first NTSC video signal, and when receiving a MUSE system high-definition television signal, this signal is converted into an interlaced scanning video signal. a converter capable of converting and outputting a second NTSC video signal and a progressively scanned third NTSC video signal, and outputting this signal as it is when receiving the first NTSC video signal; the second NTSC video signal of scanning or the first NTSC video signal and the third NTSC video signal of progressive scanning;
SC video signals can be received at separate input terminals, and when processing the first or second NTSC video signal of interlaced scanning, a double speed conversion function of the scanning signal is operated to convert the number of scanning lines. Equipped with an EDTV receiver that can

As means for automatically operating the double speed conversion function in the EDTV receiver, a signal output from a synchronization signal circuit inside the converter is guided, and it is determined whether or not this signal includes a double speed synchronization signal. a synchronization signal determination circuit,

When the judgment output of this synchronization signal judgment circuit indicates that there is a double-speed synchronization signal, the signal of the third NTSC video signal input terminal is selected and guided to the internal processing circuit, and the judgment signal indicates that there is no double-speed synchronization signal. When indicating the above, the apparatus includes a switching means for selecting the signal of the first or second NTSC video signal input terminal and guiding it to the double speed conversion circuit section.

0010

[Operation] With the above means, the double speed conversion processing mode of the EDTV receiver is automatically switched on and off, thereby eliminating the inconvenience of operation.

[0011]

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

FIG. 1 shows an embodiment of the present invention. Reference numeral 11 denotes a MUSE/NTSC converter, and an input terminal 12 receives a MUSE signal, which is a detected output from a BS tuner. This MUSE signal is processed by the video processing circuit 13 as NTSC video signals P2 (525/1:1) and P1 (525/1:1).
5/2:1) and input to the mixing circuit 14. The video processing circuit 13 also creates a control signal CN indicating whether or not the MUSE signal is being received, and outputs it to the output terminal 15. Furthermore, some signals (synchronization signals, control data, etc.) processed by the video processing circuit 13 are
The signal is input to the synchronization signal circuit 16. The synchronization signal circuit 16 is
A synchronization signal is created according to the type of input signal and is supplied to the mixing circuit 14. Also, the synchronization signal circuit 1
6 can output to the output terminal 17 a keyed AFC pulse for performing keyed AFC in the BS tuner.

When receiving the MUSE signal, the synchronization signal circuit 16 creates a synchronization signal and supplies it to the mixing circuit 14, adding an appropriate synchronization signal to each of the NTSC video signals P1 and P2. The video signal P2 output from the mixing circuit 14 is led out to the output terminal 18, and the video signal P1 is supplied to the switching circuit 19. The switching circuit 19 has a terminal 20
An NTSC video signal from a BS tuner is also introduced via the BS tuner. This is because the BS tuner can receive and output a normal NTSC video signal in addition to the MUSE signal. The switching circuit 19 selectively derives one of the inputs, and the switching is performed using the control signal C.
It is being executed by N. When in the MUSE signal reception mode, the video signal P1 is selected and led to the output terminal 21, and the MUSE signal is
When the USE signal is not received, the video signal at the input terminal 20 is selected and output to the output terminal 21.

On the other hand, 22 is an EDTV receiver, specifically showing an input switching section. The input terminal 23 has M
Output terminal of USE/NTSC decoder 11 (525/1
:1 video signal is obtained) is connected to the input terminal 24, and an output terminal 21 (525/2:1 video signal is obtained) is connected to the input terminal 24. Input terminals 23 and 24 are connected to an input switching circuit 25. Further, the input terminal 23 is connected to a synchronization signal detection circuit 26. The synchronizing signal detection circuit 26 determines whether a progressive scanning NTSC video signal or another signal is being input to the input terminal 23. This corresponds to determining whether the MUSE signal is being processed (received) in the MUSE/NTSCS converter 11. Synchronization detection circuit 26
When a sequentially scanned NTSC video signal is input, a determination is made based on the frequency of the synchronizing signal, and a determination signal J is output. This determination signal is supplied to the control terminal of the switching circuit 25, and also to the operation on/off control terminal of the double speed conversion circuit (which doubles the number of scanning lines) inside the EDTV receiver.

The switching circuit 25 determines whether the determination signal J is MUSE
When indicating the signal processing mode, the progressive scanning NTSC video signal from the input terminal 23 is selected and the signal processing circuit 2 of the next stage is selected.
7, and when indicating that the MUSE signal processing mode is not set, the interlaced scanning NTSC video signal from the input terminal 24 is selected and controlled to be supplied to the next stage signal processing circuit 27. In the signal processing circuit 27, when in the MUSE signal processing mode, the input switching circuit 25 selectively derives the sequential scanning NTSC video signal, so Y/C separation, video processing, color signal processing, etc. are performed, and R, G , B signal is obtained. The signals are then supplied to the double speed conversion circuit 28, but at this time, since the double speed conversion circuit 28 is switched to a state where the signals are passed through as is by the determination signal J, these signals are led out to the output terminal 29. On the other hand, the determination signal J is M
When the USE signal processing mode is not indicated, the input switching circuit 25 selects the interlaced scanning NTSC video signal of the input terminal 24 and supplies it to the signal processing circuit 27. At this time, the signal processing circuit 27 performs various processes using a clock according to interlaced scanning. The R, G, and B signals obtained here are input to the double speed conversion circuit 28. In the double speed conversion circuit 28,
At this time, a double-speed conversion process is performed to double the number of scanning lines and output a progressive scanning signal, thereby making the signal suitable for the EDTV screen.

As described above, the internal processing circuit of the EDTV receiver processes the following signals depending on whether the input signal is a progressive scanning NTSC video signal or an interlaced scanning NTSC video signal.
The internal signal processing mode changes automatically.

The invention is not limited to the above embodiments. FIG. 2 shows another embodiment of the invention. In the above embodiment, when the EDTV receiver 22 side monitors whether or not a double-speed frequency synchronization signal is obtained from the synchronization signal circuit 16 inside the MUSE/NTSC converter 11, the video signal input to the input terminal 23 is It was used as. However, in the embodiment of FIG. 2, the synchronization signal from the synchronization signal circuit 16 is supplied to the terminal 51 of the EDTV receiver 22 through an independent path, and the synchronization signal here is sent to the synchronization signal detection circuit 26.
We are trying to monitor it. The other parts are the same as those in the previous embodiment and are therefore given the same reference numerals.

[0018]

[Effects of the Invention] As explained above, this invention
A means for determining the type of input signal is provided in the V receiver, and the internal signal processing mode can be switched by automatically determining the type of input signal, thereby obtaining appropriate signal processing.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram showing another embodiment of the invention.

FIG. 3 is a block diagram showing a conventional MUSE/NTSC converter.

FIG. 4 is a diagram showing the layout of a receiving device centering on a MUSE/NTSC converter.

FIG. 5 is a diagram showing another layout of a receiving device centering on a MUSE/NTSC converter.

FIG. 6 is a diagram showing still another layout of a receiving device centering on a MUSE/NTSC converter.

[Explanation of symbols]

11...MUSE/NTSC converter, 13...video processing circuit, 14...mixing circuit, 16...synchronizing signal circuit, 19...switching circuit, 26...synchronizing signal detection circuit, 27...signal processing circuit, 28...double speed conversion circuit.

Claims (1)

[Claims] Claim 1: MUSE system video signal and first NTSC
When a high-definition MUSE television signal is received, this signal is sent to a second NTSC video signal of interlaced scanning and a third NTSC video signal of progressive scanning.
The first N
A converter that outputs this signal as it is when receiving a TSC video signal, and a second NTS for interlaced scanning.
C video signal or the first NTSC video signal and the third NTSC video signal of progressive scanning can be received at separate input terminals, and the first or second NTSC video signal of interlaced scanning can be received at separate input terminals.
When processing an NTSC video signal, the EDTV receiver is equipped with an EDTV receiver capable of operating a scanning signal double-speed conversion function to convert the number of scanning lines, and the double-speed conversion function in the EDTV receiver is automatically activated. The operating means includes a synchronization signal determination circuit that receives a signal output from a synchronization signal circuit inside the converter and determines whether or not this signal includes a double-speed synchronization signal, and a determination output of this synchronization signal determination circuit. When the double-speed synchronization signal is present, the signal of the third NTSC video signal input terminal is selected and guided to the internal processing circuit, and when the determination signal indicates that the double-speed synchronization signal is absent, the signal of the first or second NTSC video signal input terminal is selected. 1. A high-definition television receiver comprising switching means for selecting a signal at a video signal input terminal and guiding the selected signal to a double speed conversion circuit section.