JPH0575979A - Resample dislocation detecting method - Google Patents

Abstract

PURPOSE:To provide the method to detect the resample dislocation of a MUSE signal. CONSTITUTION:The section of respective sample points of the signal of a VITS area superimposed on a quantized MUSE signal is interpolated by at least one interpolating point or above, and for example, from the maximum value of the value to interpolate a sample point Y1 and a sample point Y2, the point (DELTA mark) without any resample dislocation is obtained, and the resample dislocation is detected from the Y1 point and a DELTA mark point. The interpolation may be performed at plural points.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resample shift detecting method for detecting a resample shift at the time of quantization in transmission of a MUSE signal known as one of high definition image signals.

[0002]

2. Description of the Related Art In recent years, technical development of high-definition images has been active, but the quality of transmitting the image signals is an important issue.

When transmitting a high definition image signal, the MUSE signal is offset-sampled and transmitted, and the receiving side interpolates the offset samples to reproduce the original signal.

2 and 3 show the VITS of the MUSE signal.
The signal of the area is shown in a waveform diagram. In the figure, in the MUSE signal, the signal in the VITS region has a negative polarity on the first line and a positive polarity on the second line.
101 samples are overlapped up to 6 samples.

The signal in the VITS area is offset by a unit time for each frame, as shown in FIGS. When quantizing, the sample points when the unit time is offset are indicated by the circles in FIG. 5, and the sample points when the unit time is not offset are indicated by the crosses in FIG. By interpolating the sample points of FIGS. 4 and 5, the impulse signal shown in FIG. 6 can be obtained. The impulse signal shown in FIG. 6 shows the VITS signal in the case where there is no re-sampling and its sampling point.

FIG. 1 shows the VIT when there is a resample deviation.
The S signal is shown in a waveform diagram. That is, the relative position between the sample points indicated by □ and the sample points indicated by + in the figure is deviated from the ideal relationship between the sample points shown in FIG. In this case, the VITS signal is reproduced differently from the original signal.

[0007]

In such MUSE signal transmission, the re-sampling shift in offset sampling is a major factor causing image quality deterioration. Detecting this resample shift is an important issue in the decoding process of the MUSE signal.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for detecting resample deviation.

[0009]

In order to achieve the above object, the present invention provides a V superposed on a quantized MUSE signal.
The difference between the interpolation point and the sample point corresponding to the peak value of the VITS area signal obtained by tracing the signal in the VITS area by sequentially interpolating the sample points of the signal in the ITS area with at least one interpolation point To the resample shift detecting method for detecting the resample shift in the quantization of the MUSE signal.

[0010]

According to the present invention, in the above method, the sampling points are sequentially interpolated to trace the signal in the VITS area, and the deviation between the interpolation point corresponding to the peak point of the signal in the VITS area and the sampling point corresponds to the resample deviation. ..

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for detecting a resample shift of a MUSE signal according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a waveform diagram showing an example of sample points when there is a resample shift. In the figure, the + mark corresponds to the X mark in FIG. 4, and the □ mark corresponds to the ◯ mark in FIG. Also △
The mark indicates a sample point corresponding to the case where the signal in the VITS area is quantized without resample shift. Here, as shown in FIG. 1, the □ mark and the adjacent + mark are interpolated.

As an interpolation method, first, an interpolation formula between each sample is created by using the sample values of □ mark and + mark in FIG. For example, the interpolation formula is a mixed spline interpolation formula represented by the following equation (1).

[0013]

[Equation 1]

In equation (1), X0, X1, X2, X
3 is a value at each sample point, U is a parameter for dividing X1 and X2, and X is an interpolated value obtained at the point of the parameter U.

When the interpolation formula represented by the equation (1) is made to correspond to FIG. 1, the + sample point next to the Δ mark is X1 (hereinafter referred to as Y1) and the □ sample point next to it is X0 ( (Hereinafter referred to as Y0), the □ sample point next to the △ mark is X2
(Hereinafter referred to as Y2), the + mark sample point next to it is X3.
(Hereinafter referred to as Y3). Now, when the interpolation value between Y1 and Y2 is obtained using U as a parameter, the interpolation value draws a curve between Y1 and Y2 in FIG.

The maximum value of X at this time is the position of the Δ mark in FIG. 1, and the corresponding parameter U is the resample deviation.

As described above, according to the resample deviation detecting method of the embodiment of the present invention, at least one or more interpolation points between the respective sample points of the signal in the VITS area superimposed on the quantized MUSE signal are sequentially arranged. The signal in the VITS region is interpolated and traced, and the resample deviation in the quantization of the MUSE signal is detected from the difference between the interpolation point and the sample point corresponding to the peak value of the VITS region signal obtained by tracing. By using the sample deviation detection method,
Resample deviation can be detected.

[0018]

As is apparent from the above embodiments, the VITS region signal is obtained by sequentially interpolating at at least one or more interpolation points between each sample point of the VITS region signal superimposed on the quantized MUSE signal. And a resample shift detecting method for detecting the resample shift in the quantization of the MUSE signal from the difference between the interpolation point and the sample point corresponding to the peak value of the VITS region signal obtained by tracing. As a result, it is possible to detect a resample shift associated with the quantization of the MUSE signal, and prevent deterioration of image quality.

[Brief description of drawings]

FIG. 1 is a waveform diagram showing interpolation of a signal in a VITS area when there is a resample deviation.

FIG. 2 is a waveform diagram showing a first line signal of a signal in the VITS area.

FIG. 3 is a waveform diagram showing a second line signal of a signal in the VITS area.

FIG. 4 is a waveform diagram showing sampling points without offset in a signal in the VITS region.

FIG. 5 is a waveform diagram showing offset sampling points in a signal in the VITS region.

FIG. 6 is a waveform diagram showing a signal in which a signal in the VITS region is interpolated when there is no resample deviation.

[Explanation of symbols]

 Y0, Y1, Y2, Y3 Sample points △ Interpolated points corresponding to peaks among interpolated points

Claims (1)

[Claims] 1. V superposed on a quantized MUSE signal
The difference between the interpolation point and the sample point corresponding to the peak value of the VITS area signal obtained by tracing the signal in the VITS area by sequentially interpolating the sample points of the signal in the ITS area with at least one interpolation point To a resample shift detecting method for detecting a resample shift in the quantization of the MUSE signal.