JPH0530482A - High definition television receiver - Google Patents

Abstract

PURPOSE:To reduce the circuit scale and the cost by reducing the number of field memories required by a decoder. CONSTITUTION:A signal 7 of a field memory 6 in an inter-frame interpolation part 3 for inter-frame interpolation is delayed in a 4H delay line 30 by 4 lines and is expanded by a time expanding part 32 with respect to time, thereby supplying a MUSE (high definition television) signal 2 of one field before, which is required by a color difference signal inter-field interpolation part 34a in a color difference signal processing part 23, to this inter-field interpolation part 34a. The inter-field interpolation part is constituted to merely include a selector, and field memories required in a conventional device are reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a high-definition television receiver for demodulating a band-compressed high-definition television signal into an original wideband high-definition television signal and reproducing the signal. High-definition television receiver adapted to supply the signal outputted from the means and the signal delayed by one field period extracted from the cyclic processing path in the interframe interpolating means for the interfield interpolating means of the color difference signal. Regarding

[0002]

2. Description of the Related Art As a method of band-compressing a wideband high-definition television signal to a practical level for transmission, the original high-definition television signal is subjected to a sub-Nyquist sample that makes a round in four fields.
There is a qist Sampling Encoding system ("A new transmission system for high-definition television ~ MUSE
~ ", July 1984, NHK Giken Monthly Report, Vol. 27, No. 7).

FIG. 5 is a circuit diagram showing a conventional MUSE signal decoder for demodulating a band-compressed high-definition television signal (hereinafter referred to as MUSE signal) into an original broadband high-definition television signal. ..

The MUSE signal 2 is supplied to the input terminal 1 and input to the interframe interpolating section 3.

In the interframe interpolating section 3, the MUSE signal 2
The signal 1 field before and the signal 3 field before are interpolated in the field memory 6 to form the signal 7, and
The signal 2 fields before the MUSE signal 2 and the signal 4 fields before are interpolated in the field memory 8 to form a signal 9. Then, in the input switching circuit 4, the signal 4 fields before included in the signal 9 is replaced with a new MUSE.
The signal 2 is replaced, and the current signal and the signal two fields before are cyclically processed to obtain a signal 5 interpolated between frames.

The signal 5 is a 2-line delay line (2H delay line) 1
At 1, the signal 12 is delayed by 2 line periods. Traffic light 12
Is 1 for inter-field interpolation of the luminance signal processing unit 10.
It is supplied to a pre-filter 13 consisting of a 2 MHz low pass filter. The prefilter 13 extracts frequency components from 0 to 12 MHz and supplies it as a signal 14 to the frequency converter 15. The frequency converter 15 is 32 MHz
The rate signal 14 is converted into a 48 MHz rate signal 16 and supplied to the inter-field interpolation unit 17. The inter-field interpolation unit 17 interpolates the inter-field signal to obtain an inter-field interpolation signal 18. The inter-field interpolation signal 18 is a signal obtained by combining data for four fields of the input MUSE signal, and is input to the mixing circuit 36 of the luminance signal processing unit 10.

The signal 12 is the field interpolator 1
9 is also supplied. The field interpolation unit 19 obtains a signal 20 by field interpolation processing from only the data of the current field. The signal 20 is input to the frequency converter 21 and the time extension unit 24. The signal 20 input to the frequency converter 21 is converted into a signal of 48 MHz rate, that is, converted into the intra-field interpolation signal 22 and input to the mixing circuit 36 of the luminance signal processing unit 10. Also, the time extension unit 2
In 4, the signal 20 of 32 MHz rate is expanded into the color difference signal of 8 MHz rate and input to the mixing circuit 37 of the color difference signal processing unit 23 as the inter-field interpolation signal 25.

Further, the signal 5 is delayed for four lines by a four-line delay line (4H delay line) 26 for inter-field interpolation of the color difference signal processing unit 23, and is also supplied to the time expansion unit 28 as a signal 27. To be done. 32M in the time extension unit 28
Hz rate signal 27 is 8 MHz rate color difference signal 29
And is supplied to the inter-field interpolation unit 34. The inter-field interpolation unit 34 interpolates the inter-field signal to obtain an inter-field interpolation signal 35. The inter-field interpolation signal 35 is a signal obtained by combining data for four fields of the input MUSE signal, and is input to the mixing circuit 37 of the color difference signal processing unit 23.

The mixing circuit 36 of the luminance signal processing unit 10 changes the mixing ratio of the inter-field interpolation signal 18 and the intra-field interpolation signal 22 according to the motion detection signal 45 to obtain the luminance output signal 38, and outputs the luminance output. Output to the terminal 39.

The mixing circuit 37 of the color difference signal processing section 23 changes the mixing ratio of the inter-field interpolation signal 35 and the intra-field interpolation signal 25 according to the motion detection signal 43 to obtain the color difference output signal 40, and outputs the color difference output. Output to the terminal 41.

The motion detection signal 43 is generated by the motion detection section 42 to which the signal 5 is supplied, and the motion detection signal 45 is generated by the frequency converter 44 which converts the motion detection signal 43 into a 48 MHz rate.

FIG. 6 is a circuit diagram showing the structure of the inter-field interpolation unit 34 of the color difference signal processing unit 23. Input terminal 46
The signal 29 input to is delayed by one field period in the field memory 51 and output as the signal 52. The signal 52 and the signal 29 are alternately selected and output by the selector 48, and output to the output terminal 50 as the inter-field interpolation signal 35. As shown in FIG. 3, the selector 48 replaces the data at the position of x (non-sample point) in the line of the current field represented by the solid line with the upper and lower data (circle) of one field period before represented by the broken line. Select to interpolate with the created data. Switching signal is terminal 49
Given by.

[0013]

In this conventional MUSE signal decoder, two field memories are required because one to four fields before the signal is required in the cyclic processing of the interframe interpolation means. , The inter-field interpolation unit of the luminance signal and the chrominance signal requires a signal of one field period before, so that one field memory is required for each of the inter-frame interpolation unit and the inter-field interpolation unit. A total of four field memories are required. For this reason, it is difficult to reduce the circuit configuration and cost of the high-definition television receiver.

An object of the present invention is to eliminate the above-mentioned drawbacks, thereby reducing the number of field memories required as a decoder for MUSE signals, and reducing the circuit structure and cost, thereby providing a high-definition television. It is to provide a receiver.

[0015]

According to the present invention, an interframe interpolating means for interpolating an input high-definition television signal by a cyclic process using a field memory, and an output from the interframe interpolating means. Inter-field interpolation processing means for performing inter-field interpolation, field interpolation means for performing field interpolation, and inter-field interpolation processing means and the field for the color difference signal of the high-definition television signal In a high-definition television receiver including a mixing unit that adaptively mixes the output signal of the interpolation processing unit based on the motion detection signal of the high-definition television signal, the high-definition television signal before one field period. Is provided from the interframe interpolating means and is supplied to the interfield interpolating means.

[0016]

The signal supplying means extracts a high-definition television signal for one field period, which is required as the inter-field interpolating means, from the signal path in the inter-frame interpolating means and supplies it to the inter-field interpolating means of the color difference signal. ..

Therefore, it is not necessary to provide a field memory in the inter-field interpolating means, and the circuit scale and cost can be reduced.

[0018]

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

FIG. 1 is a block diagram showing a main part of a first embodiment of the present invention, showing a decoder for MUSE signals.

The first embodiment includes an input switching circuit 4, a field memory 6 and a field memory 8. The MUSE signal 2 is input from the input terminal 1 and interframe interpolation means for performing interframe interpolation by cyclic processing. Inter-frame interpolating section 3 and 2-line delay line (2H delay line) 11, pre-filter 13, frequency converter 15, inter-field interpolating section 17, field interpolating section 19, frequency converter 21,
And a mixing circuit 36, which performs inter-field interpolation and field interpolation on the brightness signal of the output signal 5 of the inter-frame interpolation section 3 by adapting to the motion detection signal 45, and the field. The interpolation unit 19, the time expansion unit 24, the 4-line delay line (4H delay line) 26, the time expansion unit 28, the 4-line delay line 30, the time expansion unit 32, the inter-field interpolation unit 34a, and the mixing circuit 37. Including the color difference signal processing unit 23 that performs interfield interpolation and field interpolation on the color difference signal of the output signal 5 of the interframe interpolation unit 3 by adapting to the motion detection signal 43, and the interframe interpolation unit 3 The output signal 5 of FIG. 1 is input and the motion detection signal 43 is output, and the frequency converter 44 that frequency-converts the motion detection signal 43 and outputs the motion detection signal 45 is provided.

FIG. 2 is a circuit diagram showing details of the inter-field interpolating section 34a of FIG. Inter-field insertion section 34a
Includes only the selector 48, not the field memory.

The feature of the present invention is that in FIG. 1, a 4-line delay line as a signal supply means for extracting the MUSE signal of one field period before from the interframe interpolating section 3 and supplying it to the interfield interpolating section 34a. 30 and the time extension unit 32 are provided, and the inter-field interpolating unit 34a has a configuration without a field memory as shown in FIG.

That is, the difference between the first embodiment and the conventional example shown in FIGS. 5 and 6 is the point described in the above-mentioned features of the present invention.

Therefore, the operation of the first embodiment will be described focusing on the part different from the conventional one. In FIG. 1, the signal 7 output from the field memory 6 of the interframe interpolating unit 3 is
The signal 31 is input to the 4-line delay line 30 and delayed for a period of 4 lines to be a signal 31, which is input to the time extension unit 32. In the time expansion unit 32, the 32 MHz signal 31 is expanded in time into the 8 MHz signal 33, which is input to the inter-field interpolation unit 34 a of the color difference signal processing unit 23.

In the inter-field interpolating section 34a, as shown in FIG.
Output signal 29 from the input terminal 47 and the output signal 33 from the time extension unit 32 input from the input terminal 47 are alternately selected and output by the selector 48 and output from the output terminal 50 as an inter-field interpolation signal 35. The selector 48 is shown in FIG.
As shown in FIG. 3, 1 shown by a broken line with respect to the position of the X mark (non-sample point) on the line of the current field shown by a solid line.
Select to interpolate the data created by the upper and lower data (circle) before the field period. The switching signal is given from the terminal 49. FIG. 4 is a block diagram showing the main part of the second embodiment of the present invention, showing a decoder. In the first embodiment of FIG. 1, the signal 7 is delayed by four lines by the four-line delay line as in the prior art, but the second embodiment of FIG. 4 is the signal which is the feature of the present invention. As a supply means, the capacity of the field memory 6a of the interframe interpolating unit 3 is adjusted to increase by 4 lines, and the signal 7a delayed by 4 line periods from the conventional output signal 7 is supplied via the time expanding unit 32. The data is input to the inter-field interpolating unit 34. In this second embodiment, compared with the first embodiment of FIG.
There is an advantage that one line delay line (4 line delay line 30 in the first embodiment of FIG. 1) can be deleted. In addition, in the second embodiment, the capacity of the field memory 6a is increased by four line periods, and the field memory 8 in the subsequent stage is
Although the signal 7a input to a is delayed by a period of four lines, the signal 9a input to the input switching circuit 4 is changed from the conventional one by reducing the capacity of the field memory 8a in the subsequent stage by four lines as compared with the conventional one. It can be the same as the example signal 9. Other parts are the same as those in the first embodiment.

[0026]

As described above, according to the present invention, the signal one field period before, which is supplied for the inter-field interpolation means of the color difference signal, is taken out from the signal path in the inter-frame interpolation means. Therefore, the field memory of the inter-field interpolation unit of the color difference signal is not required,
This has the effect of reducing the circuit scale and cost.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a main part of a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing details of an inter-field interpolating section a.

FIG. 3 is an explanatory diagram showing the operation of the selector.

FIG. 4 is a block diagram showing a main part of a second embodiment of the present invention.

FIG. 5 is a block configuration diagram showing a main part of a conventional example.

FIG. 6 is a circuit diagram showing details of the inter-field interpolation unit.

[Explanation of symbols]

1, 46, 47 Input terminal 2 MUSE signal 3 Interframe interpolator 4 Input switching circuit 5, 7, 7a, 9, 9a, 12, 14, 16, 20, 2
7, 29, 31, 33, 52 signal 6, 6a, 8, 8a, 51 field memory 10 luminance signal processing unit 11 2 line delay line (2H delay line) 13 prefilter 15, 21, 44 frequency converter 17, 34, 34a Inter-field interpolation section 18 Inter-field interpolation signal 19 Inter-field interpolation section 22, 25, 35 Inter-field interpolation signal 23 Color difference signal processing section 24, 28, 32 Time extension section 26, 30 4 line delay line (4H Delay line) 36, 37 Mixing circuit 38 Luminance output signal 39 Luminance output terminal 40 Color difference output signal 41 Color difference output terminal 42 Motion detection unit 43, 45 Motion detection signal 48 Selector 49 terminal 50 Output terminal

Claims (1)

Claim: What is claimed is: 1. An interframe interpolation means for interpolating an input high-definition television signal by a cyclic process using a field memory, and an interframe interpolation means for output. Inter-field interpolation processing means for performing inter-field interpolation and field interpolation means for performing field interpolation on the color difference signal of the high-definition television signal, the inter-field interpolation processing means and the field interior A high-definition television receiver comprising a mixing means for adaptively mixing the output signal of the insertion processing means based on the motion detection signal of the high-definition television signal, A high-quality television set, comprising signal supply means for taking out from the interframe interpolating means and supplying the interfield interpolating means. John receiver.