JPH0638131A - Television receiver - Google Patents

Abstract

(57) [Summary] [Purpose] High-quality video can always be provided regardless of whether MUSE broadcasting or NTSC pay broadcasting is received. [Structure] BS receiver 11 for receiving satellite broadcasting, bit stream output terminal T4, and FM detection output terminal T2
, AFC input terminal T3, composite video input terminal T5, and S video input terminal T6 for inputting S video signals
And a Y / C separation circuit for inputting a composite video signal from the composite video input terminal T5 to separate it into a luminance signal and a chrominance signal, and the video signal separated by this circuit or the S signal input from the S image input terminal T6. In a television receiver provided with a display processing unit for processing one of the video signals and displaying it on the screen, an MU for discriminating whether the satellite broadcast received by the BS receiving unit 11 is an NTSC broadcast or a MUSE broadcast.
The SE signal detector 15 and the Y / C separation circuit 12
A switching unit 14 which inputs the C-separated video signal and the S video signal from the S video input terminal, and selectively switches and outputs the detection signal from the MUSE signal detection unit 15.
And is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver having a satellite broadcast receiving function, in which a descrambler for decoding a pay broadcast and a MUSE-NTSC converter are used. In a configuration, the present invention relates to a television receiver capable of always displaying a high-quality image on a screen regardless of whether a pay broadcast or a MUSE broadcast is received.

[0002]

2. Description of the Related Art In recent years, the spread and spread of satellite broadcasting has been remarkable and the number of broadcasting channels has been increasing. Also, pay broadcasting has started in satellite broadcasting (hereinafter referred to as BS broadcasting). This pay broadcast is one in which a broadcast signal is scrambled and transmitted, and is released and received by a device (descrambler) which releases the broadcast signal, and is expected to become more popular in the future.

[0003] In addition, a high definition broadcast (hereinafter referred to as MUSE broadcast) of the MUSE system, which is a system different from the conventional NTSC system, has also started using BS broadcast. This M
A dedicated high-definition television receiver is required to receive USE broadcasting, but a conventional NTSC television receiver is connected by connecting a device (MUSE-NTSC converter) that converts a MUSE signal to an NTSC signal. It is also possible to receive at. The MUSE system has much higher image quality than the NTSC system broadcasting,
When an image is received by an NTSC television receiver via the MUSE-NTSC converter, the image quality is almost the same as the NTSC image quality.

However, in the MUSE system, the luminance signal and the chrominance signal are transmitted separately from the time of transmission.
Even when converted to the NTSC system via the USE-NTSC converter, a video signal in which the luminance signal (Y) and the color signal (C) are separated is output from the S video output terminal of the converter, which causes cross color interference. And dot interference will not occur. On the other hand, in NTSC pay broadcasting, after the composite video signal in which the luminance signal and the color signal are superimposed is descrambled through the descrambler,
Since the television receiver separates the luminance signal and the color signal, cross color interference or dot interference may occur.

In FIG. 3, a television receiver having a satellite broadcast receiving function, an NTSC pay broadcast decoding descrambler, and a MUSE-NTSC converter having an external input switching circuit are connected using a composite video signal cable. It is a block diagram of a case. FIG. 4 is a block diagram in which a television receiver with a satellite broadcast receiving function, an NTSC pay broadcast decoding descrambler, and a MUSE-NTSC converter having an external input switching circuit are connected using an S cable. is there.

In FIGS. 3 and 4, reference numeral 10 is NTS.
This is a television receiver with a C-system satellite broadcast receiving function. This television receiver 10 is connected to a BS antenna and is inputted from the outside by a BS receiver 11 composed of a BS tuner for receiving a BS broadcast. A Y / C separation circuit 12 that separates the composite video signal into a luminance signal (Y) and a chrominance signal (C), a video signal of the luminance signal and the chrominance signal that is separated by the Y / C separation circuit 12, or an external A display processing unit 13 for displaying and displaying the S video signal input from the device, and a BS antenna (including a BS converter)
The BS-IF signal from 20 is input, and the BS receiver 1
1, a BS input terminal T1 for supplying the signal to the No. 1 terminal, an FM detection output terminal T2 for outputting the FM detection signal from the BS receiver 11, and an AF from the MUSE-NTSC converter 30.
An AFC input terminal T3 for inputting a C signal, a bitstream output terminal T4 for outputting a bitstream signal from the BS receiver 11, and a composite video input terminal T5 for externally inputting a composite video signal.
And an S image input terminal T6 for inputting an S image signal of a luminance signal and a color signal from the outside.

The descrambler 40 receives the bit stream signal and the FM detection signal from the television receiver 10 and outputs a descrambled composite video signal. The descrambler 40 has an FM detection input terminal T21 for inputting the FM detection signal. A bit stream input terminal T22 for inputting a bit stream signal and a composite video output terminal T23 for outputting a descrambled composite video signal are provided.

The MUSE-NTSC converter 30 receives the FM detection signal (MUS) from the television receiver 10.
MUSE-N to input E signal) and convert to NTSC signal
The NTSC signal from the TSC conversion unit 31 and the MUSE-NTSC conversion unit 31 is input to the input terminal a to input the descrambler 4
Input the composite video signal from 0 to the input terminal b,
A composite video output switching section 32 for switching and outputting signals at the input terminals a and b, and a descrambler 40.
Y / C separation circuit 33 for inputting the composite video signal from and separating it into a luminance signal (Y) and a color signal (C).
And the NTSC from the MUSE-NTSC converter 31
The signal is input to the input terminal a, and Y from the Y / C separation circuit 33 is input.
/ C separated signal is input to input end b, and input ends a and b
Output switching unit 34 for switching and outputting the signal
And an FM detection input terminal T11 to which the FM detection signal from the television receiver 10 is input, and an AFC output terminal T to output the AFC signal from the MUSE-NTSC converter 30.
12, an FM detection output terminal T13 for directly outputting the FM detection signal to the descrambler 40, a composite video input terminal T14 for inputting a composite video signal from the descrambler 40, and a composite video from the output switching section 32. A composite video output terminal T15 for outputting a signal and an S video output terminal T16 for outputting the S video signal from the output switching section 34 are provided.

When the user receives the MUSE broadcast, the user switches the output switching units 32 and 34 to the input end a,
When receiving a TSC pay broadcast, switch to the input terminal b and watch.

Looking at the connection method between the input / output terminals, in FIGS. 3 and 4, between the bit stream input / output terminals T4 and T22, between the AFC input / output terminals T12 and T3,
Cables are connected between the FM detection input / output terminals T2 and T11, between T13 and T21, and between the composite video input / output terminals T23 and T14. Further, in FIG.
The composite video output terminal T15 of the USE-NTSC converter 30 and the composite video input terminal T5 of the television receiver 10 are connected using a composite video signal cable 51. In FIG. 4, the MU
The S video output terminal T16 of the SE-NTSC converter 30 and the S video input terminal T6 of the television receiver 10 are connected to S
Connection is made using a cable 52.

In the above structure, MUSE-NTSC
If the satellite broadcast received by the television receiver 10 is MUSE broadcast, the converter 30 outputs the MUSE signal to N
The signal converted into the TSC signal is output to the composite video output terminal T15 and the S video output terminal T16, and in the case of NTSC pay broadcasting, the composite video signal from the descrambler 40 is directly output to the composite video output terminal T15. From the S video output terminal T16, a signal obtained by Y / C separating the composite video signal from the descrambler 40 by the Y / C separation circuit 33 is output.

By the way, in FIG. 3, the composite video signal of the MUSE-NTSC converter 30 is input to the Y / C separation circuit 12 in the television receiver 10 by using the composite video terminals T15 and T5, and the luminance signal and the color are supplied. The signal is being separated. Therefore, the image quality is deteriorated as compared with the case where the S video terminals T16 and T6 are used as shown in FIG.

Further, in FIG. 4, when the MUSE broadcast is received, the image quality is higher than that in FIG. 3 because the S video terminals T16 and T6 are used, but when the NTSC pay broadcast is received, the MUSE broadcast is received. -NTSC converter 30 Y /
Since the C separation circuit 33 separates the luminance signal and the chrominance signal, the performance of the Y / C separation circuit 33 of the MUSE-NTSC converter 30 is inferior to that of the Y / C separation circuit 12 of the television receiver 10. Therefore, the image quality is inferior to that in FIG.

As described above, in the conventional techniques, it was impossible to receive the highest quality image at all times by either of the connection methods shown in FIGS. 3 and 4. Further, in order to improve these problems, the user has to manually switch the input, which is inconvenient.

[0015]

As described above, in the conventional technique, a high-quality image is automatically received both when receiving through the MUSE-NTSC converter and when receiving through the descrambler. It was impossible.

Therefore, in view of the above problems, the present invention provides a MU.
It is an object of the present invention to provide a television receiver capable of always displaying a high-quality image regardless of whether SE broadcasting or NTSC pay broadcasting is received.

[0017]

A television receiver according to the present invention comprises a BS receiver for receiving satellite broadcasting, a bit stream output terminal, an FM detection output terminal, and an AFC.
An input terminal, a composite video input terminal to which a composite video signal is externally input, and an S video input terminal to which a video signal divided into a luminance signal and a chrominance signal is externally input,
A Y / C separation circuit for inputting a composite video signal from the composite video input terminal and separating it into a luminance signal and a chrominance signal, and satellite broadcasting received by the BS receiver are NTS.
A broadcast signal detecting section for discriminating between C broadcast and MUSE broadcast,
A video signal divided into a luminance signal and a chrominance signal by the Y / C separation circuit and an S video signal from the S video input terminal are selectively switched and output, and the broadcast signal detection unit is a MUSE broadcast. When the S signal is detected, the S image signal from the S image input terminal is selected,
A television provided with a switching unit for selecting a video signal from the Y / C separation circuit when an SC broadcast is detected, and a display processing unit for displaying the signal selected by the switching unit and displaying it on the screen. The receiver and the bit stream output and FM detection output from this television receiver are input,
The satellite broadcast signal received by the BS receiver is generally B
In the case of S broadcasting and pay broadcasting, a descrambler that descrambles the FM detection signal and outputs it as a composite video signal to the composite video input terminal, and an FM detection output from the television receiver are input to the BS. The satellite broadcast signal received by the receiver is MU
If it is an SE signal, convert it to an NTSC signal,
MUS that outputs as an S video signal to the S video input terminal
It is characterized by comprising an E-NTSC converter.

[0018]

According to the present invention, since the MUSE broadcast is transmitted by separating the luminance signal (Y) and the color signal (C),
When receiving via the MUSE-NTSC converter, S and Y from the S video terminal are separated from each other.
When a general satellite broadcast or pay broadcast is received via a descrambler using a video signal, a signal obtained by separating a composite video signal from a composite video terminal by a Y / C separation circuit inside a television receiver is used. Therefore, it is possible to always display a high quality image on the screen.

[0019]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a block diagram showing a television receiver according to an embodiment of the present invention. The same parts as those in FIGS. 3 and 4 are designated by the same reference numerals for description.

In FIG. 1, a television receiver 10A having a satellite broadcast receiving function, a descrambler 40 for decoding NTSC pay broadcast, and an MUS having an external input switching circuit.
FIG. 7 is a block diagram in the case where the E-NTSC converter 30 is connected using a composite video signal cable 51 and an S cable 52.

A television receiver 10A with a satellite broadcast receiving function is connected to a BS antenna, a BS receiver 11 for receiving a BS broadcast, and a composite video signal externally input to a luminance signal (Y) and a color signal (C). ) Separated into Y /
The C separation circuit 12, the display processing section 13 for displaying and screen-displaying the video signal of the luminance signal and the chrominance signal separated by this circuit 12, or the S video signal inputted from the outside, and the BS receiving section 11 The MUSE signal detector that determines whether the BS broadcast is NTSC broadcast or MUSE broadcast, the Y / C separated signal of the composite video signal input to the composite video input terminal T5, and the signal input to the S video input terminal T6. Switching unit 14 that switches and supplies to the display processing unit 13, and BS antenna (including BS converter)
The BS-IF signal from 20 is input, and the BS receiver 1
1, a BS input terminal T1 for supplying the signal to the No. 1 terminal, an FM detection output terminal T2 for outputting the FM detection signal from the BS receiver 11, and an AF from the MUSE-NTSC converter 30.
An AFC input terminal T3 for inputting a C signal, a bitstream output terminal T4 for outputting a bitstream signal from the BS receiver 11, a composite video input terminal T5 for externally inputting a composite video signal, a luminance signal and a chrominance signal. And an S-video input terminal T6 for externally inputting the S-video signal.

The descrambler 40 receives the bit stream signal and the FM detection signal from the television receiver 10 and outputs a descrambled composite video signal. The descrambler 40 has an FM detection input terminal T21 for inputting the FM detection signal. A bit stream input terminal T22 for inputting a bit stream signal and a composite video output terminal T23 for outputting a descrambled composite video signal are provided.

The MUSE-NTSC converter 30 receives the FM detection signal (MUS) from the television receiver 10.
MUSE-N to input E signal) and convert to NTSC signal
The NTSC signal from the TSC conversion unit 31 and the MUSE-NTSC conversion unit 31 is input to the input terminal a to input the descrambler 4
Input the composite video signal from 0 to the input terminal b,
A composite video output switching section 32 for switching and outputting signals at the input terminals a and b, and a descrambler 40.
Y / C separation circuit 33 for inputting the composite video signal from and separating it into a luminance signal (Y) and a color signal (C).
And the NTSC from the MUSE-NTSC converter 31
The signal is input to the input terminal a, and Y from the Y / C separation circuit 33 is input.
/ C separated signal is input to input end b, and input ends a and b
Output switching unit 34 for switching and outputting the signal
And an FM detection input terminal T11 to which the FM detection signal from the television receiver 10 is input, and an AFC output terminal T to output the AFC signal from the MUSE-NTSC converter 30.
12, an FM detection output terminal T13 for directly outputting the FM detection signal to the descrambler 40, a composite video input terminal T14 for inputting a composite video signal from the descrambler 40, and a composite video from the output switching section 32. A composite video output terminal T15 for outputting a signal and an S video output terminal T16 for outputting the S video signal from the output switching section 34 are provided.

When the user receives the MUSE broadcast, the user switches the output switching units 32 and 34 to the input end a,
When receiving a TSC pay broadcast, switch to the input terminal b and watch.

In the above, the television receiver 10A
Between the FM detection output terminal T2 of the receiver and the FM detection input terminal T11 of the MUSE-NTSC converter 30, and the AF of the receiver 10A.
C input terminal T3 and converter 30 AFC output terminal T12
Between the bit stream output terminal T4 of the receiver 10A and the bit stream input terminal T22 of the descrambler 40,
Descrambler 40 composite video output terminal T23
And composite video input terminal T14 of converter 30
Between, the composite video output terminal T15 of the converter 30
Between the composite video input terminal T5 of the receiver 10A and
And the S video output terminal T16 of the converter 30 and the receiver 10
The S video input terminals T6 of A are connected to each other.

Next, the operation of this embodiment will be described. The BS broadcast received by the BS antenna 20 is the television receiver 10
It is input to A and received by the BS receiver 11. Here, the digital audio bit stream signal and the video FM detection signal are output to the descrambler 40, respectively.
The MUSE-NTS is included in the E-NTSC converter 30.
The FM detection signal is supplied to the C conversion unit 31, and the AFC signal is returned to the BS reception unit 11 of the receiver 10A.

When receiving the MUSE broadcast, the output switching units 32 and 34 are switched to the terminal a side in advance. In this case, the signal received by the BS receiver 11 is MUSE.
After being converted into an NTSC signal by the NTSC converter 30, it is supplied to the S image input terminal T6 of the receiver 10A through the terminal a of the output switching section 34, and the terminal a of the switching section 14
Entered in. At the same time, the NTSC signal converted by the MUSE-NTSC converter 30 is supplied to the composite video input terminal T5 of the receiver 10A through the terminal a of the output switching unit 32 and to the terminal b of the switching unit 14 through the Y / C separation circuit 12. Is entered. In this case, since the receiving unit 11 of the television receiver 10A receives the MUSE signal, the MUSE signal detecting unit 15 outputs a signal of a predetermined DC level (for example, 5 V), and the switching unit 14 uses this DC signal. Is switched to the terminal a side. Therefore, the switching unit 14 selects the S video input from the S video input terminal T6 when receiving the MUSE broadcast, and supplies it to the display processing unit 13.

When receiving general NTSC BS broadcasts and pay broadcasts, the output switching unit 32,
34 is switched to the terminal b side. In this case, BS
The pay broadcasting signal received by the receiver 11 is the descrambler 4
It is descrambled by 0 and input to the input terminal T14 of the MUSE-NTSC converter 30 as a composite video signal. The composite video signal input to the converter 30 is input to the composite video input terminal T5 of the receiver 10A through the terminal b of the output switching unit 32, and the terminal b of the switching unit 14 through the Y / C separation circuit 12.
Entered in. At the same time, the composite video signal input to the MUSE-NTSC converter 30 is Y / C separated by the Y / C separation circuit 33 inside the converter 30, and then the S image input of the receiver 10A is performed through the terminal b of the output switching unit 34. Input to the terminal T6 and the terminal a of the switching unit 14
Entered in. In this case, since the receiving unit 11 of the television receiver 10A receives a general BS broadcast signal or a pay broadcast signal, the MUSE signal detecting unit 15 outputs a 0V DC signal, and the switching unit 14 uses this signal. Is switched to the terminal b side. Therefore, the switching unit 14
Upon reception of pay broadcasting, a signal obtained by Y / C separating the composite video signal from the Y / C separation circuit 12 is selected and supplied to the display processing unit 13.

In this way, when the MUSE signal is received by the automatic switching of the switching unit 14, the high-quality S video terminals T16 and T6 are used, and general BS broadcasting and N broadcasting are performed.
When the TSC pay broadcast is received, the composite video signal terminals T15 and T5 are switched to use and the high performance Y / C separation circuit 12 inside the television receiver 10A is used.
Can be used.

In the embodiment of FIG. 1, when receiving a pay broadcast, the output switching unit 32 in the MUSE-NTSC converter 30 is switched to the terminal b side, and the switching unit 14 in the receiver 10A is switched to the terminal b. When receiving a MUSE broadcast, the output switching unit 34 is switched to the terminal a side, and the switching unit 14 inside the receiver 10A is switched to the terminal a.
Since it may be used by switching to the side, the following configuration may be adopted.

FIG. 2 is a block diagram showing another embodiment of the present invention. In the embodiment shown in FIG. 2, the output switching units 32 and 34 and the Y / C separation circuit 33 in FIG.
MUSE-NTSC of USE-NTSC converter 31 only
The converter 30A is configured, MUSE-NTS
The NTSC signal from the C converter 31 is directly input to the terminal a of the switching unit 14 in the receiver 10A through the S video output terminal T16, the S cable 52, and the S video input terminal T6, and the descrambler 40 descrambles the signal. The composite video signal thus obtained is input as it is to the terminal b of the switching unit 14 through the composite video input terminal T5, the composite video signal cable, and the Y / C separation circuit 12 in the receiver 10A. Other configurations are the same as those in FIG.

According to the above configuration, when the MUSE broadcast is received, the switching unit 14 is switched to the terminal a side by the high level signal from the MUSE signal detecting unit 15, so that the MU
The S video signal from the SE-NTSC converter 31 is directly supplied to the display processor 13. Further, when receiving a general BS broadcast or pay broadcast, the switching unit 14 is switched to the terminal b side by the low level signal from the MUSE signal detecting unit 15, so that the descrambled composite video signal from the descrambler 40 is received. Y / in machine 10A
It is Y / C separated by the C separation circuit 12 and supplied to the display processing unit 13. Therefore, the same effect as in the case of FIG. 1 can be obtained.

[0033]

As described above, according to the present invention, even if MUSE broadcasting is received by automatic switching, N
Even when a TSC broadcast is received, it is possible to always provide a high quality image.

[Brief description of drawings]

FIG. 1 is a block diagram showing a television receiver according to an embodiment of the present invention.

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

FIG. 3 is a block diagram showing an example of a connection method in a conventional television receiving device.

FIG. 4 is a block diagram showing another connection example in the conventional television receiving device.

[Explanation of symbols]

 10A ... Television receiver with satellite broadcasting receiving function 11 ... BS receiving section 12, 33 ... Y / C separation circuit 13 ... Display processing section 14 ... Switching section 15 ... MUSE signal detecting section (broadcast signal detecting section) 20 ... BS antenna 30, 30A ... MUSE-NTSC converter 31 ... MUSE-NTSC converter 32, 34 ... Output switching unit 40 ... Descrambler T5 ... Composite video input terminal T6 ... S video input terminal T15 ... Composite video output terminal T16 ... S video output terminal

Claims (1)

[Claims] 1. A BS receiver for receiving satellite broadcasting, a bit stream output terminal, an FM detection output terminal, an AFC input terminal, a composite video input terminal to which a composite video signal is externally input, a luminance signal and a color. The S video input terminal to which the video signal divided into the signals is externally input, the Y / C separation circuit which inputs the composite video signal from the composite video input terminal, and separates it into a luminance signal and a chrominance signal, and the BS receiving section are provided. The satellite broadcast received is NTSC
A broadcast signal detection unit for discriminating between broadcasting and MUSE broadcasting, a video signal divided into a luminance signal and a color signal by the Y / C separation circuit, and an S video signal from the S video input terminal are selectively switched and output. When the broadcast signal detector detects the MUSE broadcast, the S video signal from the S video input terminal is selected, and the broadcast signal detector selects the NTS signal.
A television provided with a switching unit for selecting a video signal from the Y / C separation circuit when C broadcast is detected, and a display processing unit for displaying the signal selected by the switching unit and displaying the screen. The receiver and the bit stream output and FM detection output from this television receiver are input, and when the satellite broadcast signal received by the BS receiver is a general BS broadcast or pay broadcast, the FM detection signal is received. A descrambler which descrambles and outputs a composite video signal to the composite video input terminal; and an FM detection output from the television receiver,
The satellite broadcast signal received by the BS receiver is MUSE.
A television receiver comprising a MUSE-NTSC converter which, when the signal is a signal, converts the signal into an NTSC signal and outputs the signal to the S-video input terminal as an S-video signal.