JP3125896B2 - MUSE signal transmission / reception system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a MUSE signal transmission / reception system.

[0002]

2. Description of the Related Art In a conventional MUSE signal transmitting / receiving system, as shown in FIG. 2, an output from a TCI encoder 3 is branched on a transmitting side, and a static signal is converted into a three-dimensional prefilter 4 and a static signal processing circuit. 5, the signal is input to one end of the mixing circuit 31, and the motion-related signal is processed by the two-dimensional pre-filter 7 and the motion-related signal processing circuit 8 and input to the other end of the mixing circuit 31. I have. Also, T
The output from the CI encoder 3 is input to the motion detection circuit 30, the motion detection circuit 30 detects the motion amount for each pixel, outputs a coefficient corresponding to the motion amount, inputs the coefficient to the mixing circuit 31, and the static The system signal and the motion system signal are multiplied by coefficients, added, and both signals are proportionally mixed and input to the frequency converter 32. The frequency converter 32 performs inter-frame offset subsampling at 16.2 MHz. The MUSE signal is in the form of a digital signal, and the signal is subjected to transmission processing such as conversion processing to an analog signal and transmitted.

On the receiving side, the transmitted MUSE signal is demodulated and subjected to reception processing by an A / D converter or the like having a sampling frequency of 16.2 MHz. The static input signal is branched and the static input signal is supplied to the static input signal reproducing circuit 14.
After the signal processing is performed by the frequency converter 15, the signal is input to one end of the mixing circuit 16. The motion-based signal is processed by the motion-based signal reproduction circuit 20 and the frequency converter 21, and then input to the other end of the mixing circuit 16. The branched image signal is input to a motion detection circuit 17, the motion detection circuit 17 detects a motion amount for each pixel, outputs a coefficient corresponding to the motion amount, inputs the coefficient to a frequency converter 18, and outputs the coefficient to the frequency converter 18. The sampling frequency is input to the mixing circuit 16, and the static signal and the motion signal are multiplied by a coefficient in the mixing circuit 16, added, and the static signal and the motion signal are proportionally mixed. , And are decoded into a luminance signal and a color difference signal by a TCI decoder 22 and input to an inverse matrix circuit 23, where they are converted into primary color signals by an inverse matrix circuit 23, and are displayed based on the primary color signals. Type is to reproduce the image at equal.

[0004]

In the conventional MUSE signal transmission / reception system, a stationary system signal and a motion system signal are mixed in proportion and the signal is transmitted. Therefore, a motion detection circuit is required on the transmission side. However, on the receiving side, there is a problem that the motion detection cannot be accurately performed because the stationary system signal and the motion system signal are proportionally mixed. In addition, since the static system signal and the motion system signal are mixed, the static region and the motion system signal are mixed. There is also a problem that it is difficult to accurately reproduce the area.
According to the present invention, a still system signal and a motion system signal are separately transmitted, and a reproduction system reproduces a still system signal and a motion system signal separately, thereby accurately reproducing a still region and a motion region to improve reproduction image quality. The purpose is to do.

[0005]

FIG. 1 is an electric circuit block diagram of a MUSE signal transmitting / receiving system showing an embodiment of the present invention. As shown in FIG. The TCI encoder 3 encodes color line-sequentially into TCI signals, and converts the image signal into a static signal processing means (in FIG. 1, a pre-filter 4, a static signal processing circuit 5, and a frequency converter 6), and a motion signal processing means. (In FIG. 1, the pre-filter 7, the motion-related signal processing circuit 8, and the frequency converter 9) perform thinning-out processing and transmit them as a static signal and a motion-related signal. Input terminals 12 and 13 are provided to split the input of the static signal from the input terminal 12, one of which is input to the static signal reproducing circuit 14, the other is input to the motion detecting circuit 17, Input from the input terminal 13 of the system signal is input to the motion-system signal reproducing circuit 20, the two reproduction circuit 1
At 4 and 20, interpolation processing is performed to reproduce a static signal and a motion signal, respectively. The signals are input to frequency converters 15 and 21, respectively. And the motion detection circuit 17
A coefficient corresponding to the amount of motion detected in step (1) is output and input to the frequency converter 18, the sampling frequency is converted by the frequency converter 18 and input to the mixing circuit 16, and the reproduced static signal and motion signal are reproduced. Are proportionally mixed to reproduce the MUSE signal. Further, a switch 19 is provided between the input terminal 13 for the motion-system signal and the motion-system signal reproducing circuit 20, and an input from the input terminal 13 is input to one end of the switch 19, and an input of the static-system signal is input. When an input from the terminal 12 is applied to the other end of the switch 19 and a normal MUSE signal is received, the MUSE signal is input to the input terminal 12,
The output of the switch 19 is switched so that the input from the input terminal 12 is output from the switch 19 and is input to the motion signal reproduction circuit 20.

[0006]

According to the present invention, the MUSE signal is transmitted according to the above-described configuration. The transmitting side processes the stationary system signal and the motion system signal separately and transmits them. The motion-related signals are separately reproduced, and then proportionally mixed to form an image signal. As in the conventional case, the reproduction processing is performed on a signal obtained by mixing a static-related signal and a motion-related signal. Unlike this, the still region and the moving region can be accurately reproduced.

[0007]

FIG. 1 shows an embodiment of the present invention, MUSE.
FIG. 1 is an electric circuit block diagram of a signal transmitting / receiving system, and FIG.
The upper part shows the transmitting side, and the lower part shows the receiving side. In the figure, the same components as those shown in FIG. 2 are denoted by the same symbols. First, the transmitting side will be described below. Reference numeral 1 denotes a high-vision camera, which outputs an image captured from the high-vision camera 1 as RGB primary color signals, converts the primary color signals into digital signals, performs processing such as inverse gamma correction, and inputs the signals to the matrix circuit 2 Then, the luminance signal and the color difference signal (Y, RY, B-
Y), which is output and input to the TCI encoder 3. The TCI encoder 3 encodes and outputs a color line sequential TCI signal, and thereafter processes the image signal by dividing the image signal into a still system signal and a motion system signal. The stationary system signal is input to the stationary system signal processing circuit 5 after limiting the pass band by the three-dimensional pre-filter 4, and the static system signal processing circuit 5 performs offset sampling between fields, thins out pixel data, and provides the frequency converter 6. The signal is input, and the sampling frequency is converted to 16.2 MHz by the frequency converter 6 to obtain a static signal S, which is output from the output terminal 10.

The motion-system signal is input to a motion-system signal processing circuit 8 after limiting the pass band by a two-dimensional pre-filter 7, and the motion-system signal processing circuit 8 performs offset sampling between lines to thin out pixel data to perform frequency conversion. The frequency is converted into a motion system signal M by converting the sampling frequency to 16.2 MHz by the frequency converter 9 and output from the output terminal 11. The output from the output terminal 10 and the output terminal 11 is transmitted after performing transmission processing such as transmission path equalization processing and conversion processing to an analog signal. Therefore, unlike before,
A motion detection circuit and a mixing circuit are not required on the transmission side, so that the circuit of the transmission side device can be simplified. Alternatively, a recording system may be inserted between the frequency converter 9 and the output terminal 11.

On the receiving side, the transmitted signal is demodulated and converted into a digital signal by an A / D converter having a sampling frequency of 16.2 MHz, and the extracted static signal S and motion signal M are input to an input terminal. 12 and 13. The input from the input terminal 13 is input to one end of the switch 19, the input from the input terminal 12 is branched, and the branched first is input to the stationary system signal reproducing circuit 14, and the branched second is input. Is input to the motion detection circuit 17, and the branched third is input to the other end of the switch 19.
When a normal MUSE signal is received, the MUSE signal is input to the input terminal 12 and the switch 19 is switched so that the input from the input terminal 12 is input to the motion-related signal reproducing circuit 20, and the conventional MUSE signal is received. The MUSE signal can be reproduced by performing signal processing similar to that of the decoder.

According to the present invention, when reproducing a signal in which the static system signal S and the motion system signal M are separately transmitted, the static system signal S input from the input terminal 12 is input to the static system signal reproducing circuit 14. Then, the sampling frequency is converted by the static system signal reproducing circuit 14, subjected to frame interpolation and field interpolation processing, output and input to the frequency converter 15, and the sampling frequency is converted by the frequency converter 15. As a result, the signal in the stationary area is reproduced and the mixing circuit 16
Input to one end of Also, the input terminal 13
Is input to a motion-system signal reproducing circuit 20 via a switch 19, the motion-system signal reproducing circuit 20 converts the sampling frequency, performs a field interpolation process, and outputs the result. The signal is input to the frequency converter 21, and the sampling frequency is converted by the frequency converter 21, thereby reproducing the signal in the motion area and inputting the signal to the other end of the mixing circuit 16.

Further, the stationary system signal S inputted from the input terminal 12 is inputted to the motion detecting circuit 17, and the motion detecting circuit 1
7, a motion amount for each pixel is detected, a coefficient corresponding to the motion amount is output and input to the frequency converter 18, and the frequency converter 18
The sampling frequency is converted and input to the mixing circuit 16. The mixing circuit 16 multiplies the signal of the still region by a coefficient corresponding to the amount of motion of each pixel, and multiplies the signal of the moving region by a coefficient corresponding to the amount of motion of each pixel, and adds the multiplied value. Thus, the signals in the stationary area and the signals in the moving area are proportionally mixed and output, and input to the TCI decoder 22, where the luminance signal Y and the chrominance signal R are output.
-Y, BY, and outputs the same, and converts the output into an analog signal.
Is converted into RGB primary color signals by the inverse matrix circuit 23 and output. The output is input to a display or the like to reproduce an image.

[0012]

As described above, according to the present invention,
The MUSE signal is divided into a static signal and a motion signal and transmitted separately, so that a motion detecting circuit and a mixing circuit are not required on the transmitting side, and the circuit on the transmitting side can be simplified. On the receiving side, the still system signal and the motion system signal can be separately reproduced, and the still region and the moving region can be accurately reproduced, so that a MUSE signal transmitting / receiving system with good reproduction image quality can be provided.

[Brief description of the drawings]

FIG. 1 is an electric circuit block diagram of a MUSE signal transmission / reception system, showing one embodiment of the present invention.

FIG. 2 is an electric circuit block diagram of a MUSE signal transmission / reception system showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera 2 Matrix circuit 3 TCI encoder 4 Prefilter 5 Stationary signal processing circuit 6 Frequency converter 7 Prefilter 8 Motion system signal processing circuit 9 Frequency converter 10 Output terminal 11 Output terminal 12 Input terminal 13 Input terminal 14 Static system signal Reproduction circuit 15 Frequency converter 16 Mixing circuit 17 Motion detection circuit 18 Frequency converter 19 Switch 20 Motion system signal reproduction circuit 21 Frequency converter 22 TCI decoder 23 Inverse matrix circuit 30 Motion detection circuit 31 Mixing circuit 32 Frequency converter 33 Input Terminal

Claims (3)

(57) [Claims] In a MUSE signal transmitting / receiving system,
On the transmission side, a stationary system signal processing unit and a movement system signal processing unit are provided for an image signal of a color line sequential TCI signal encoded by the TCI encoder. System signal, and on the receiving side, input terminals for stationary system signal and motion system signal are provided,
The input from the input terminal of the static signal is branched, and one is input to the static signal reproducing circuit, the other is input to the motion detecting circuit, and the input from the input terminal of the motion signal is input to the motion signal reproducing circuit. Input, the two reproduction circuits respectively perform interpolation processing to reproduce a static signal and a motion signal, and the reproduced static signal and the motion signal are reproduced in accordance with the amount of motion detected by the motion detection circuit. A MUSE signal transmission / reception system, which reproduces a MUSE signal by mixing signals. 2. A switch is provided between an input terminal of the motion-system signal and a motion-system signal reproducing circuit, and an input from the input terminal of the motion-system signal is applied to one end of the switch, and the static system signal is provided. Input from the input terminal of the switch to the other end of the switch, when receiving a normal MUSE signal, input a MUSE signal to the input terminal of the static system signal, switch the output of the switch, 2. The MUSE signal transmission / reception system according to claim 1, wherein the input from the input terminal of the static system signal is output from the switch. 3. The motion system according to claim 1, wherein the stationary system signal processing means comprises a three-dimensional prefilter for limiting a pass band, a stationary system signal processing circuit for thinning out an image signal, and a frequency converter for converting a sampling frequency. 2. The MUSE signal according to claim 1, wherein the signal processing means comprises a two-dimensional pre-filter for limiting a pass band, a motion-based signal processing circuit for thinning out an image signal, and a frequency converter for converting a sampling frequency. Transmission / reception system.