JP2671908B2 - 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 transmitting / receiving system.

[0002]

2. Description of the Related Art In a conventional MUSE signal transmission / reception system, as shown in FIG. 2, on the transmission side, an output from a TCI encoder 3 is branched so that a stationary system signal has a three-dimensional pre-filter 4 and a stationary system signal processing circuit. 5 performs signal processing and inputs to one end of the mixing circuit 31. Motion system signals are processed by the two-dimensional pre-filter 7 and motion system signal processing circuit 8 and input to the other end of the mixing circuit 31. There is. Also, T
The output from the CI encoder 3 is input to the motion detection circuit 30, the motion detection circuit 30 detects the amount of motion for each pixel, the coefficient corresponding to the amount of motion is output and input to the mixing circuit 31, and the mixing circuit 31 stops. A system signal and a motion system signal are multiplied by a coefficient, added, both signals are proportionally mixed and input to the frequency converter 32, and the frequency converter 32 performs inter-frame offset subsampling at 16.2 MHz, A MUSE signal in digital signal format is used, and the signal is transmitted after being subjected to transmission processing such as conversion processing to an analog signal.

On the receiving side, the transmitted MUSE signal is demodulated, received by an A / D converter having a sampling frequency of 16.2 MHz, etc., and then the image signal converted into a digital signal and extracted is input through an input terminal 33. Input, and the same input is branched, and the static system signal is reproduced by the static system signal reproducing circuit 14
And the signal is processed by the frequency converter 15 and then input to one end of the mixing circuit 20, and the motion system signal is processed by the motion system signal reproducing circuit 18 and the frequency converter 19 and then input to the other end of the mixing circuit 20. The branched image signal is input to the motion detecting circuit 16, the motion detecting circuit 16 detects the amount of motion of each pixel, and a coefficient corresponding to the amount of motion is output to output the frequency converter 17.
To the mixing circuit 20, and the mixing circuit 20 multiplies the stationary system signal and the motion system signal by a coefficient, and performs addition to add the stationary system signal and the motion system signal. Are proportionally mixed and input to the TCI decoder 21, which is then decoded into a luminance signal and a color difference signal by the TCI decoder 21 and input to the inverse matrix circuit 22, which is then converted into a primary color signal by the inverse matrix circuit 22. The image is reproduced by inputting it to a display or the like.

[0004]

In the conventional MUSE signal transmission / reception system, the stationary system signal and the motion system signal are proportionally mixed and the signal is sent out. Therefore, the motion detection circuit is required on the transmission side. , On the receiving side, there is a problem that motion detection cannot be performed accurately because the static system signal and the motion system signal are proportionally mixed. Also, since the static system signal and the motion system signal are mixed, the static area and motion There is also a problem that it is difficult to accurately reproduce the area.
According to the present invention, a stationary system signal and a motion system signal are transmitted as time-division signals, and the stationary system signal and the motion system signal are separated and reproduced separately on the reproducing side, thereby accurately reproducing the stationary region and the motion region. The purpose is to improve the playback image quality.

[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-sequential TCI signals, and the image signals are static system signal processing means (prefilter 4, static system signal processing circuit 5 and frequency converter 6 in FIG. 1), and motion system signal processing means. (In FIG. 1, the pre-filter 7, the motion system signal processing circuit 8 and the frequency converter 9) perform thinning-out processing respectively and input to the switch circuit 10, and the switch circuit 10 switches at a double speed to perform static system signal and motion system processing. The signal is transmitted as a time-divided signal, and on the receiving side, the input processing circuit 13 separates and outputs the static system signal and the motion system signal, the input of the static system signal is branched, and one of Enter the stop system signal reproducing circuit 14 and the other input to the motion detection circuit 16, the input of the motion system signal is input to the motion system signal reproducing circuit 18, the two reproduction circuit 14
And 18 respectively perform interpolation processing to reproduce the stationary system signal and the moving system signal, convert the sampling frequency, and mix circuit 2
0, outputs a coefficient according to the amount of motion detected by the motion detection circuit 16, converts the sampling frequency and inputs the mixed frequency to the mixing circuit 20, and the mixing circuit 20 reproduces the stationary system signal and the motion. The system signals are proportionally mixed to reproduce the MUSE signal. In addition, the switch circuit 10
In this case, the one that outputs the stationary system signal and the moving system signal in a time division manner is used by switching at about 32.4 MHz.

[0006]

According to the present invention, the MUSE signal is transmitted by the above-mentioned configuration, the stationary system signal and the motion system signal are separately processed on the transmitting side, and the two signals are time-divided by the switch circuit 10. In the receiving side, the input processing circuit 13 separates the static system signal and the moving system signal and reproduces them separately, and then proportionally mixes them to form an image signal. Unlike the case where the reproduction processing is performed on the signal in which the still system signal and the motion system signal are mixed, the still area and the motion area can be accurately reproduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, MUSE.
1 is a block diagram of an electric circuit of a signal transmission / reception system, and FIG.
The upper part shows the transmitting side and the lower part shows the receiving side. In the figure, the same parts as those shown in FIG. 2 are indicated by the same symbols. First, the transmitting side will be described below. Reference numeral 1 denotes a high-definition camera, which outputs an image captured by the high-definition camera 1 as RGB primary color signals, converts the primary color signals into digital signals, performs inverse gamma correction, etc., and then inputs them to a matrix circuit 2. Then, in the matrix circuit 2, the luminance signal and the color difference signals (Y, RY, B-
Y) is converted and output, and then input to the TCI encoder 3. The TCI encoder 3 encodes and outputs a color line-sequential TCI signal, and thereafter, the image signal is divided into a static system signal and a motion system signal for signal processing. The static system signal is input to the static system signal processing circuit 5 with its pass band limited by the three-dimensional pre-filter 4, and the static system signal processing circuit 5 performs inter-field offset sampling to thin out pixel data and to the frequency converter 6. The sampling frequency is converted to 16.2 MHz by the frequency converter 6 to form a static system signal, which is input to one end of the switch circuit 10.

The motion system signal is limited in pass band by the two-dimensional pre-filter 7 and input to the motion system signal processing circuit 8. The motion system signal processing circuit 8 performs line-to-line offset sampling to thin out pixel data and perform frequency conversion. The sampling frequency is converted to 16.2 MHz by the frequency converter 9 into a motion system signal, which is input to the other end of the switch circuit 10. The switch circuit 10 switches at a switching frequency of about 32.4 MHz, time-divisionally outputs the stationary system signal and the moving system signal through an output terminal 11, and outputs the output to a transmission line equalization process or an analog signal. The transmission processing such as the conversion processing is performed and the data is transmitted. Therefore, unlike the conventional case, the motion detection circuit and the mixing circuit are not required on the transmission side, the circuit of the device on the transmission side can be simplified, and when used in a camera-integrated VTR or the like, the switch circuit 10 and the output A recording system may be inserted between the terminals 11.

The receiving side demodulates the transmitted signal,
A signal obtained by time-division of the still system signal and the motion system signal, which is converted into a digital signal by the A / D converter having a sampling frequency of about 32.4 MHz and extracted, is input to the input processing circuit 13 via the input terminal 12. In the input processing circuit 13, a switching frequency of about 32.4 MHz is used so that the signals are alternately output from the output terminal and the stationary system signal of 16.2 MHz and the motion system signal of 16.2 MHz. Is output separately. In the conventional MUSE decoder, the input circuit before the interpolation processing of the image signal uses a signal with a sampling frequency of 16.2 Msample / sec, and it is possible to pass a signal of 32.4 Msample / sec there. And the demodulation circuit up to the input terminal 12 is a conventional M
The circuit of the USE decoder can be used. The stationary system signal is output from the output terminal, the same output is branched and one is input to the stationary system signal reproducing circuit 14,
The other is input to the motion detection circuit 16.

In the stationary system signal reproducing circuit 14, for example, 3
Inter-frame interpolation and inter-field interpolation are performed using a sampling frequency of 2.4 MHz, output, and input to the frequency converter 15, and the same frequency converter 15 outputs, for example, 48.
By converting to a sampling frequency of 6MHz,
The signal in the stationary area is reproduced and input to one end of the mixing circuit 20. Also, the motion system signal is output from the output terminal, and the same signal is output from the motion system signal reproducing circuit 18
To the same motion system signal reproduction circuit 18 and, for example, 3
Field interpolation processing is performed using a sampling frequency of 2.4 MHz, and the result is output and input to the frequency converter 19.
The same frequency converter 19 converts the signal to a sampling frequency of, for example, 48.6 MHz to reproduce the signal in the motion region and input it to the other end of the mixing circuit 20.

Further, the motion detection circuit 16 detects the amount of motion of each pixel from the input still system signal, outputs a coefficient corresponding to the amount of motion and inputs the coefficient to the frequency converter 17, which in turn outputs the same to the frequency converter 17. For example, the sampling frequency of 48.6 MHz is converted and input to the mixing circuit 20.
The mixing circuit 20 multiplies the signal in the still region by a coefficient according to the amount of motion of each pixel, and multiplies the signal in the moving region by a coefficient according to the amount of motion of each pixel and adds the product to the multiplication value. Accordingly, the signal in the still region and the signal in the moving region are proportionally mixed and output, and input to the TCI decoder 21, and the TCI decoder 21 decodes the luminance signal Y and the color difference signals RY and BY to output. The output is converted into an analog signal, input to the inverse matrix circuit 22, converted into RGB primary color signals by the inverse matrix circuit 22 and output, and the output is input to a display or the like to reproduce an image. I am trying to do it.

[0012]

As described above, according to the present invention, the stationary side signal and the moving side signal are separately processed on the transmitting side,
The switch circuit sends both signals as time-divided signals, eliminating the need for a motion detection circuit or mixing circuit on the transmission side, simplifying the circuit on the transmission side, and input processing on the reception side. The circuit separates the stationary system signal and the moving system signal and processes them separately for reproduction, so that the stationary area and the moving area can be accurately reproduced, and a MUSE signal transmission / reception system with good reproduced image quality can be provided. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electric circuit of a MUSE signal transmitting / receiving system showing an embodiment of the present invention.

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

[Explanation of symbols]

 1 camera 2 matrix circuit 3 TCI encoder 4 prefilter 5 stationary system signal processing circuit 6 frequency converter 7 prefilter 8 motion system signal processing circuit 9 frequency converter 10 switch circuit 11 output terminal 12 input terminal 13 input processing circuit 14 stationary system Signal reproduction circuit 15 Frequency converter 16 Motion detection circuit 17 Frequency converter 18 Motion signal reproduction circuit 19 Frequency converter 20 Mixing circuit 21 TCI decoder 22 Inverse matrix circuit 30 Motion detection circuit 31 Mixing circuit 32 Frequency converter 33 Input terminal

Claims (3)

(57) [Claims] 1. In a MUSE signal transmitting / receiving system,
On the transmission side, a stationary system signal processing means and a moving system signal processing means are provided for the image signal of the color line sequential TCI signal encoded by the TCI encoder, and the image signals are thinned out and input to the switch circuit. , The switching circuit switches at double speed and transmits the static system signal and the motion system signal as time-division signals, and on the receiving side, the input system circuit separates and outputs the static system signal and the motion system signal. Input to the stationary system signal reproduction circuit, the other to the motion detection circuit, and the motion system signal input to the motion system signal reproduction circuit. Inserting processing is performed to reproduce the still system signal and the motion system signal, and the reproduced still system signal and the motion system signal are mixed according to the amount of motion detected by the motion detection circuit to reproduce the MUSE signal. Special A MUSE signal transmission / reception system to be used 2. The stationary system signal processing means includes a three-dimensional pre-filter for limiting a pass band, a stationary system signal processing circuit for thinning out image signals, 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 prefilter for limiting a pass band, a motion system signal processing circuit for thinning out an image signal, and a frequency converter for converting a sampling frequency. Transmission and reception system. 3. The switch circuit comprises about 32.4 MHz.
2. The MUSE signal transmitting / receiving system according to claim 1, wherein the MUSE signal transmitting / receiving system is configured to output the stationary system signal and the moving system signal in a time-divisional manner by switching them by.