JPS62146086A - High definition television receiver - Google Patents

Abstract

PURPOSE:To detect a position of a malfunction without using a measuring instrument by providing a test clip for selectively taking out input and output data of respective circuits and a change over circuit for selectively outputting luminance data formed by a modulation processing and the data of the clip to an analog converting circuit. CONSTITUTION:In order to detect the position of the malfunction, when a switch 17 is turned on, the change over circuit 14 outputs the data of an input terminal 13 to the converting circuit 9 instead of the luminance data of a decoder circuit 8. The input and output data of the respective circuits 4-11 taken out by selectively clipping the input and output pins of the respective circuits 4-11 by the clip 16, is inputted to the input terminal 13 through a test lead 16. According, on a picture tube 12, the picture based on the input and output data is displayed and by comparing the picture on the picture tube 12 based on the respective data, whether the circuit is normally operated or not and there is a bit error in the input and output data or not are simply discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-definition television receiver that receives and demodulates a high-definition television broadcast signal formed by band compression α.

[Conventional technology]

Conventionally, the baseband standard for high-definition television broadcast signals has been tentatively set at 112 scanning lines by the Japan Broadcasting Corporation (NHKI).
5 lines, field frequency 60Hz, interlace ratio 2:1. It has been proposed to set the luminance signal band to 20 MHz.

Furthermore, it is being considered that high-definition television broadcasting may be carried out using one channel of a broadcasting satellite.

By the way, in the transmission standard of the broadcasting satellite, the signal band of the l channel is set to 27MH2, and the transmission method is set to an analog conversion circuit.

Therefore, a high-definition television broadcast signal needs to be formed by band-compressing a baseband signal.

A new band compression method for forming high-definition television broadcast signals was developed by NHK, and a high-definition television receiver that receives high-definition television broadcast signals formed based on this method has also been developed. .

By the way, the above-mentioned new band compression method uses multiple sub-Nyquist sampling coding, which is a type of dot interlace method.
This is a method that performs bandwidth compression processing on baseband signals using the 3-ampling-encoding method. As described in the preliminary paper ``New transmission method for high-definition television'', band compression H and luminance of sub-Nyquist sampling that goes around in 4 fields and time axis multiplexing of color signals and color signals are performed. A high-definition television broadcast signal in the form of a signal (TCI signal) is formed.

On the other hand, a high-definition television receiver that receives this type of high-definition television broadcast signal is known from the journal Nikkei Electronics J (1988) published by Nikkei McGraw-Hill, Inc.
As described in Figure 43 on page 116 of the March 12, 1984 issue, and in the Technical Report of the Television Society of Japan, "High-Definition Television Transmission System" TEB891-5, dated October 20, 1988, As shown in Fig. 5, it has been proposed that the received high-definition television broadcast signal be digitally converted to 1/4 format, and in order to perform the reproduction processing digitally.
The digital data of the received high-definition television broadcast signal is output from the digital conversion section 11) to the separation section 12).

Roughly speaking, the output data of the variable A section + 11 inputted to the separation section 121 is separated into video, audio, aJ vector, and other data, and the separated video data is sent to the digital video processing section (31). The motion vector data is input to the region interpolation circuit (413) and the motion region interpolation circuit (5), and the motion vector data is manually input to the still region interpolation circuit (41).

And stationary area interpolation time II′i! Part 1 (4) is provided with 2 field memories for interpolating still areas using 4 fields of video data, and 1 field memory for interpolating slight curvature of still images. A temporal filter is provided, and interframe interpolation using a field memory and temporal interpolation using a temporal filter are performed based on control of motion vector data.

In addition, the dynamic area coulometric circuit (6) performs motion area complement 1 processing using the inputted current field video data.

Furthermore, the video data that has passed through the still area interpolation circuit (4) is input to the motion detection port (6), and the detection circuit (6) detects the inter-frame difference 711) of the input video data. do.

The video data via both sleeve circuits 141 and 151 and the detection data of the detection circuit (6) are input to the mixing circuit f75 (7), and the mixing circuit (7) detects the movement of the detection circuit (6). Based on the ratio between both sleeves circuit +4
1, 1510 video data are mixed and synthesized, and video data obtained by interpolating still areas and moving areas is output.

By the way, the video data output from the mixing circuit (7) includes a luminance signal and a chrominance signal that are time-axis multiplexed.

Therefore, the video data output from the mixing circuit (7) is
I input to the decoder circuit (8), and the decoder circuit (8)
The input video data is demodulated by the decoder circuit MTa2 to 3-step analog conversion circuit (9), α00
In (11), luminance data Y and two types of color data CM and Cw formed by demodulating the video data are output.

Then, through the analog conversion of the converters 1(9) to fil+, an analog luminance signal 1 electrical signal for displaying the received Southern Definition TV signal is formed, and the analog #
- The brightness signal 0 signal is output to the picture tube (121) of the display section, and the reception screen of the high-definition television signal is displayed on the picture tube (17J).

In Figure 2.45, in order to explain only the video processing, the audio α4! which demodulates the audio data is used. M6 etc. are omitted.

[Problem that the invention seeks to solve]

By the way, the processing unit (3) is the converting unit fi+ as described above.
Each circuit (4) to (1
11 is typically formed using a variety of commercially available digital integrated circuits.

Since each circuit (4) to (11) is formed using a large number of integrated circuits, the number of integrated circuits forming the processing section (3) exceeds 2000, for example.

On the other hand, if a malfunction occurs in each time of @ burial (3); 烙(41~+Ill etc.) and a normal reception screen cannot be obtained,
Normally, a measurement device such as a synchroscope or logic analyzer is used to observe the waveforms of input and output data of each circuit (4) to (11) and to simulate logic errors to discover malfunctioning locations.

3. For example, when observing waveforms using a synchroscope, the input and output data of each circuit (4) to (11) are
It is necessary to perform analog conversion using an analog conversion device that is installed separately from the receiver, and to send and pick up the analog signals of the input and output data of each time 11&+41 to +Ill formed by the analog conversion to a synchroscope. .

Therefore, a relatively large measuring device is required to find malfunctioning locations.

Furthermore, the input and output data of each circuit (41 to (11)) are
For example, since it consists of 8-bit digital data, it is difficult to determine whether or not it is operating normally even if you observe the waveform and detect logic errors using a measurement device, and it is difficult to determine whether the device is operating normally or not. There are problems that make this difficult.

The technical object of the present invention is to enable finding malfunctioning locations without using a measuring device or the like.

[Means for solving problems]

This invention has been made in the following manner with the above-mentioned points in mind.

(Part 1) A digital conversion unit that digitally converts a received signal of a high-quality television broadcast signal formed by band compression processing of multiple sub-Nyquist sampling encoding, and interpolation processing of video data output from the conversion unit; a digital video processing section that performs demodulation processing, converts the luminance and color data formed by the demodulation processing into analog data by a final-stage analog conversion circuit, and outputs analog m degree B and color signals; In a high-definition television receiver equipped with a picture tube that displays an image of a signal,
A test clip for selectively extracting input and output data of each circuit of the processing section, and a test clip provided at the front stage of the analog converter circuit, and a test clip for extracting the tftl and tkl data formed by the demodulation process by a switching operation. The high-definition television receiver is characterized by comprising an analog conversion data switching circuit for selectively outputting data and data to the analog conversion circuit.

a digital converter that digitally converts a received signal of a high-definition television broadcast signal formed by
At the same time, the luminance and color data formed by the demodulation process are converted into analog data by an analog conversion circuit in the final stage.
a digital video processing unit that outputs analog luminance WE and color signals; and an image receiving unit that displays images of the luminance 3 and color signals.
In a high-definition television receiver equipped with U, at least a memory in which test 611% image data consisting of digital data of still images such as color bars is stored in advance, and the digital conversion section and the processing section are connected. The digital change +11L is provided between the
a data switching circuit for selectively outputting the output data of the processing section and the test video data; a test clip for selectively outputting the input and output data of each circuit of the processing section;
An analog conversion data switching circuit is provided upstream of the analog conversion circuit and selectively outputs the luminance data formed by the demodulation and the clip data to the analog conversion circuit by a switching operation. This is a high-definition television receiver featuring the following features:

[Function] If a malfunction occurs due to a malfunction, the input and output data of each circuit of the DigiMole video ash burial section selectively extracted by the test clip is transferred via the built-in analog conversion data switching circuit. Each circuit person inputs into an analog conversion circuit into a picture tube.

The output data screen will be displayed.

In addition, the processing data 17I call circuit generates, instead of the image data of the received one word output from the digital converter,
If the test video data in the memory is input to the digital video processing section, the image will be received based on the demodulated luminance and color data and the data of the test clip.

[Example] Next, the present invention will be explained in detail with reference to FIGS. 1 to 4 showing its implementation sequence.

(Embodiment 1) First, FIG. 1 and FIG. 2 showing Embodiment 1 will be explained.

In Fig. 41B, the same symbols as in Fig. 5 indicate the same things, and the difference is between the decoder circuit (8) and the conversion circuit (9) provided at the final stage of the Q-converter (3). In between, an analog conversion data switching circuit 1 (141) is provided which selectively outputs the bright 1 current data Y of the decoder circuit (8) and the data of the test input terminal (1) by switching the operation switch described later. The test lead (test clip (101) connected to the terminal (131) and the conversion circuit (
14) The operating switch for switching operation is +7 tff.

3. The switching circuit (141) is formed, for example, by a multiplexer circuit.

In addition, the clip tl (it) consists of a so-called IC clip, and each time 1 tower (4) to (111
It has a clip terminal whose number of bits of input and output data is equal to 1, say 8 bits, and is connected to an input terminal (131) consisting of a test lead (151 connected to an IC connector, etc.).

Zarani, switch (17I is cut 1 Aoi! Package raku: 141
One end connected to the terminal is connected to the main source pin (10B) via a pull-up resistor, and the other end is grounded.

The switch [171 is held off during normal use, and at this time, based on the high-level switching side image signal output from the switch [181 to the switching circuit (14)], the switching times, ! 1141 is the luminance data Y of the decoder circuit (8)
is output to converter 1 (9).

Therefore, during normal use, the operation is similar to that shown in FIG.
+21 is displayed.

Next, when a malfunction in the processing section (3) is detected by observing both sides of the reception panel, the switch 1171 is turned on to find the malfunction, and the switching circuit +141 is turned on by turning the switch +171 off. However, instead of the luminance data from the decoder circuit (8), data from the human power terminal Q31 is output to the conversion circuit (9).

On the other hand, each circuit (
4) By selectively sandwiching the input and output pins of (11), each circuit! The input and output data of 41 to (11) are selectively taken out, and the input and output data of each circuit (41 to (11)) that could not be taken out from the clip (161) is input by valve the test lead (15). It is input to Be1ako+131.

Therefore, the picture tube +121 displays a screen based on the input and output data of each circuit (4) to Ill taken out by the clip 1161.

For example, as shown in FIG. 2, when the input data of the capture circuit 151 is extracted by the clip tlE, in this case,
The input data of the interpolation circuit (6) is input to the input terminal (13), and both sides based on the input data of the interpolation circuit (6) are displayed on the picture tube (121).

Next, when the output data of the clip (interpolated by 161 @15) is extracted, the picture tube (12+) has an interpolation circuit (
A screen based on the output data of step 5) is displayed.

By comparing the screens of the picture tube +121 based on the input and output data of the supplementary circuit (6), it is possible to determine whether the interpolation circuit (6) is operating properly or not.
It is easily determined whether there is a bit error in the output data.

Therefore, by repeating the same comparison as in the case of the fi circuit 16) for each circuit 14) to (11),
Each time, the operating status of each (41 to (11)) can be easily determined.
, Based on this discrimination, malfunctioning parts can be easily detected,
The display screen power of the picture tube T121), etc., without performing waveform observation using a measurement device such as a synchroscope, etc.
'2! The malfunctioning part of the L-embedded part (3) can be easily shown.

In the past, since the test lead (151) can be removed from the input terminal f131, during normal use, remove the test lead (1ω from the input polarizer (131) and connect the test lead (151 to the input terminal 031) only when necessary. do it.

By the way, the clip ilG, for example, each circuit 14) to 1
11) It may be formed by a single signal clip with a fixed number of bits of input and output data.
7ftl(it) If only one or several bits of the input/output data are extracted without extracting all the bits of the input/output data,
It is also possible to detect the state of each bit of input and output data.

(Other Examples) Next, Figure 3 and Figure 4 showing other implementation sequences will be described.

8 in FIG. 3, the same symbols as in FIG. The output data of the converter fi+ and the memory (1
9) is provided with a 6-minute data interval t2I+ for selectively outputting the test video data.

2. Switching circuit cl! ll is the switching time a 114+ (
! :Similarly, it is formed by an integrated circuit for multiflexors, for example.

In addition, the switch is connected to the cutting circuit ρ9, and the low resistance resistor for pull-up is connected to the positive 4 source terminal (10B).
#ic4, and the other end is grounded.

Furthermore, the signal format of the test video data of memo IJ t191 is the one-word format of the output data of the first conversion section fil,
That is, it is set to the TCI signal format.

The switch i+71.1201 is held off during normal use, and at this time, the switching circuit (211 The output data of the conversion section i11 is output to the processing section 12) and also to the input IW data 9W writing section (9) of the switching circuit (141 is the decoder + ci1, i1, and each C8).

Therefore, during normal use, the operation is the same as in the case shown in FIG.
It will be displayed on 17J.

Next, when a malfunction occurs in the processing section (3), first turn on the switch j, and by switching the switch Qα, the OFF: Moxibustion time; Then, the test central image data in the memory (19) is output to the separation unit (2).

Separation part 12171) to 1 part (31 to 1 part for testing)
The hidden image data is output, and at this time '6 of cut t embedding (3)
In the steps [4] to (11), the test video data is analyzed for 1 minute and then obtained, and the decoder is processed for 1 time (8 times).
) The brightness rK and color data Y, CN, CW of the test video data are output to the power S and conversion circuits (9) to (11), and the image of the test video data is output to the receiver 1aIW (121, for example, as shown in FIG. As shown in FIG. 1, since the image is clearly visible, it is simply determined whether the image displayed at 11121 is normal or not.

When a still image such as a curler bar is displayed based on the test video data, if the displayed image is normal, the malfunction may be in the front stage of the processing section (3) or in the interpolation stage 1 (6). It is specified in the part related to the interpolation process of the dynamic domain.

On the other hand, if the displayed still image of the test video data is not normal, the malfunction location will not be identified.

In other words, a preliminary detection of a malfunctioning portion can be performed from a still image of test video data based only on the ON state of the switch.

After performing the preliminary detection, the switch 11
71 and the specified interpolation 1gl path (6
) or the input and output data of each circuit (4) to (+11) to the clip u
If the images are selectively taken out using Q, malfunctions can be detected at a glance by comparing both display surfaces of the picture tube (121) based on the input and output data.

For example, by turning on only the switch, the picture tube ++2
If the still image displayed in 1 is not normal, the interpolation circuit (4)
If you take out the input and output data sequentially, the receiver (127if
1121 displays screens for input and output data of the first correction circuit (4) based on the test video data,
At this time, the operating state of the interpolation circuit (4) can be easily determined by comparing the screens of both data, and malfunctioning locations can be detected by performing the same determination for circuits that are not related to the interpolation process in the @ area. .

In addition, by providing the memory (additional switch circuit Q11), when detecting the malfunction 11i1, instead of using the received high-definition television broadcast signal, it is not affected by the reception status, etc. Detection can be performed using test video data whose contents are known in advance, and clip OQ can be used to preliminarily detect malfunctioning parts before extracting the input and output data of each time (Raku 141 to Kuchi 1). 1, and the location of malfunction can be found more easily than in the case of FIG. 1 without using the measurement circuit 3 or an image signal generator such as a color bar.

3. It goes without saying that the test video data stored in the memory (sub-memory) can be formed from various types of still image data such as multi-burst or ramp waveform data.

In addition, test video data consisting of a combination of still image data and moving image data is stored in the memory (191).

For example, test video data consisting of a combination of still image data of the color bar in Fig. 44 and data of a moving image of a small circle that moves once on the still image may be stored in advance. When only the picture tube (1
Depending on whether both the still image and the moving image displayed in 21 are normal, or whether only one of them is normal, malfunctioning parts can be roughly identified at intervals,
Furthermore, malfunctioning locations can be detected even more easily.

[Effects of the Invention] As described above, the high-definition television receiver of the present invention has the following effects.

(Part 1) By setting the analog conversion 1 negative data switching time 1 t+41 g and test clip tlG, the picture tube tt
From the display screen 21, it is possible to easily detect malfunction 1 at the same location.

(Part 2) In addition to the above, the memo IJ
From the display screen D), it is possible to more easily detect malfunctioning locations.

[Brief explanation of drawings]

1 to 4 show an embodiment of the high-definition television receiver of the present invention, FIG. 1 is a diagram illustrating the operation of the first embodiment, and FIG. 45 is a block diagram of a conventional high-definition television receiver. be. ill...Digital conversion section, (3)...Digital video processing section, (9)...Analog variation circuit, 121...
・Reception (2) tube, 1141...Analog conversion data switching circuit, Heater, (IG...Test clip, (19)...
Memory, ρ1)...Made-in data switching circuit. Agent: Patent Attorney Fuji 1) Ryotabe No. 42

Claims (2)

[Claims] (1) A digital conversion unit that digitally converts the received signal of a high-quality television broadcast signal formed by band compression processing of multiple sub-Nyquist sampling encoding, and interpolation processing and demodulation of the video data output from the conversion unit. a digital video processing section which processes the luminance and color data formed by the demodulation processing and converts the luminance and color data formed by the demodulation processing into analog in a final stage analog conversion circuit, and outputs analog luminance and color signals; In a high-definition television receiver equipped with a picture tube for displaying color signal images, a test clip is provided for selectively extracting input and output data of each circuit of the processing section, and a test clip is provided at a stage before the analog conversion circuit. , an analog conversion data switching circuit that selectively outputs the luminance data formed by the demodulation processing and the data of the clip to the analog conversion circuit by a switching operation. receiver. (2) A digital conversion unit that digitally converts the received signal of a high-quality television broadcast signal formed by band compression processing of multiple sub-Nyquist sampling encoding, and a digital conversion unit that performs interpolation processing, demodulation processing, etc. of video data in the conversion unit. a digital video processing section which converts the luminance and color data formed by the demodulation process into analog in a final-stage analog conversion circuit and outputs analog luminance and color signals; In a high-definition television receiver equipped with a picture tube for displaying images, a memory in which test video data consisting of digital data of still images such as at least color bars is stored in advance, the digital conversion section and the processing section; a processing data switching circuit provided between the processing data switching circuit and selectively outputting the output data of the digital conversion section and the test video data by a switching operation;
A test clip for selectively extracting input and output data of each circuit of the processing section, and a test clip provided before the analog converter circuit, and a test clip that is provided at a stage before the analog conversion circuit, and is configured to combine the brightness data formed by the demodulation process with the data of the clip by a switching operation. and an analog conversion data switching circuit that selectively outputs the data to the analog conversion circuit.