JPH04144386A - Nonlinear emphasis circuit and nonlinear de-emphasis circuit - Google Patents

Abstract

PURPOSE:To set an emphasis constant individually to a luminance signal and a chrominance signal of an input TDM signal and to ensure a required S/N by applying nonlinear emphasis processing to the signal in time division. CONSTITUTION:A TDM(time division multiplex) signal fed to an input terminal 1 is divided into two systems and fed to a nonlinear emphasis circuit 2 for Y(luminance signal) and a nonlinear emphasis circuit 4 for C(chrominance signal). The delay time of an output signal of the nonlinear emphasis circuit 2 for Y(luminance signal) is matched with an output signal of the nonlinear emphasis circuit 4 for C(chrominance signal) by a delay circuit 3 and they are fed to a switch circuit 5. The switch circuit 5 selects an output signal of the delay circuit in the case of a luminance signal in the TDM signal and an output signal of the nonlinear emphasis circuit 4 for C(chrominance signal) in the case of the chrominance signal by using a control signal fed from other input terminal 6 and outputs the selected signal to an output terminal 7. In this case, the emphasis constant is individually set to the luminance signal and the chrominance signal in the input TDM signal to ensure the required S/N.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a nonlinear emphasis circuit and a nonlinear Regarding de-emphasis circuit.

Conventional technology Conventionally, non-linear emphasis circuits and non-linear de-emphasis circuits have been widely introduced in home VTRs and other devices to prevent inversion phenomena in FM modulation and demodulation systems and improve the S/N ratio (signal-to-noise ratio) in the mid-high range. (for example, NHK Home Video Technology plOO-102: edited by Japan-Thursday Broadcasting Corporation).

Additionally, phase line emphasis and phase line de-emphasis are also known as means for minimizing the deterioration of contour waveforms due to crimping after emphasis (
For example, JP-A-53-131814 phase plane linear emphasis circuit).

FIG. 10 is a block diagram of a conventionally used phase linear nonlinear emphasis circuit, and FIG. 11 is a block diagram of a conventionally used phase linear nonlinear deemphasis circuit.

In the phase linear nonlinear emphasis circuit, as shown in FIG. 10, the input signal supplied to the input terminal 149 is divided into two systems, one of which is sent to the delay circuit 150, and the other is sent to the transversal high-pass circuit. It is supplied to a filter (abbreviated as HP F) 152. The transversal high-pass filter 152 extracts high frequency components contained in the input signal, and its phase characteristic is flat. The output signal of the transversal type high-pass filter 152 is amplitude-limited by a limiter [53] and then supplied to an addition amount adjustment circuit 154, which amplifies or amplifies the output signal of the limiter 153 by a certain factor depending on the desired amount of emphasis. Attenuated. Addition M adjustment circuit 15
The output signal of No. 4 is added to the input signal that has passed through the delay circuit 150 by an adder 151, and is taken out from an output terminal 155 as an emphasized signal. The delay circuit 150 is provided to prevent a time difference between the output of the addition amount adjustment circuit and the input signal.

Next, in the conventional phase linear non-linear de-emphasis circuit shown in FIG. is supplied to a transversal high-pass filter 159.

The transversal high-pass filter 159 extracts high frequency components contained in the input signal, and its phase characteristic is flat. After the output signal of this transversal type high-pass filter 159 is amplitude limited by a limiter 160, it is supplied to a subtraction amount adjustment circuit 161, and the output signal of the limiter 160 is amplified or attenuated by a certain factor depending on the desired de-emphasis amount. be done. The output signal of the subtraction amount adjustment circuit 161 is subtracted by the subtracter 15B from the input signal that has passed through the delay circuit 157, and is taken out from the output terminal 162 as the de-emphasized original signal.

The delay circuit 157 is provided to prevent a time difference between the output of the subtraction amount adjustment circuit and the input signal.

Problems to be Solved by the Invention In such conventional VTRs, since the S/N of the reproduced video signal deteriorates in the high frequency range, in addition to the main emphasis circuit, a non-linear emphasis circuit and a non-linear de-emphasis circuit are conventionally used. It has been introduced since. This non-linear emphasis circuit changes the amount of emphasis according to the level of the input signal during recording, increasing the amount of emphasis at low levels where noise is easily noticeable visually, and increasing the amount of emphasis at high levels where noise is not noticeable. The amount is reduced to prevent the reversal phenomenon, and a non-linear de-emphasis circuit is used to perform the reverse process during playback.

The nonlinear emphasis circuit uses a phase linear type in addition to the conventional CR type.

The phase linear type non-linear emphasis circuit has a flat delay characteristic on the frequency axis, and has a shoe 1- added before and after the edge of the reproduced image, and its peak is half that of the CR type non-linear emphasis circuit. It becomes a dispersed form.

Therefore, compared to the CR type, the noise suppression area is wider.
Since waveform deterioration after demodulation in the case of limiter is dispersed before and after etching, visual image quality deterioration can actually be kept to a minimum.

'', the effects of phase linear nonlinear emphasis are great, and transversal filters are well known as such phase linear filters.

However, in the CR shadow forming phase linear type nonlinear emphasis circuit as described in the conventional technology, the input TDM
(Time division multiplexing) Since it is not possible to set emphasis constants separately for the luminance signal and chromaticity (g =) of the A signal, the S/N of the color signal is insufficient, resulting in image quality deterioration. The S/N value of the chromaticity signal is the S/N value of the luminance signal.
It is generally known from image quality evaluation that it is necessary to make the N value 4 to 5 dB larger than the N value.

The present invention solves the above problems and performs time-division non-linear emphasis processing to input 1" DM
It is possible to secure the necessary S/N by setting emphasis constants for the luminance signal and chromaticity signal separately, and also configures a transversal type high-pass filter in the phase linear type non-linear emphasis circuit. We provide non-linear emphasis and de-emphasis circuits that make it possible to downsize the circuit by sharing the delay element between the luminance signal processing system and chrominance signal processing system, as well as the emphasis and de-emphasis sides. It is intended to.

Means for Solving the Problems In order to achieve the above object, the present invention has a circuit configuration as shown below. The invention according to claim (1) is a nonlinear emphasis circuit configured to process an input signal in a time-division manner.

The invention according to claim (2) is a nonlinear de-emphasis circuit configured to process an input signal in a time-division manner.

The invention of claim (3) is a transversal high-pass device comprising N delay elements (N is an integer of 2 or more) for extracting high frequency components contained in a TDM signal obtained by time-division of a video signal in claim (1). A filter, a nonlinear circuit (abbreviated as a limiter) that limits the amplitude of its high frequency component, and a delay circuit having approximately the same amount of delay as that generated by the transversal high-pass filter and the nonlinear circuit. a transversal high-pass filter consisting of M delay elements (M is an integer of 2 or more) that extracts high frequency components contained in the input TDM signal; A nonlinear circuit that limits the amplitude of the high frequency component; 1. The system includes two systems: a system including an adder circuit that adds a nonlinear circuit output to an input signal that has passed through a delay circuit having approximately the same amount of delay as that generated by the transversal high-pass filter and the nonlinear circuit; , is a phase linear type nonlinear emphasis circuit configured to have a switch circuit for selectively outputting the outputs of the two systems according to the luminance signal and the chromaticity signal of the input TDM signal.

The invention of claim (4) is, in claim (2),
A transversal high-pass filter consisting of N delay elements (N is an integer of 2 or more) that extracts high frequency components contained in the DM signal, a J1 linear circuit that limits the amplitude of the high frequency components, and the transversal high-pass filter that limits the amplitude of the high frequency components. a system having a subtraction circuit that subtracts the output of the nonlinear circuit from an input signal that has passed through a delay circuit having approximately the same amount of delay as that generated by the high-pass filter and the nonlinear circuit;
a transversal high-pass filter consisting of M delay elements (M is an integer of 2 or more) for extracting high-frequency components contained in the DM signal η; a nonlinear circuit for limiting the amplitude of the high-frequency components; and the transversal high-pass filter. A system including a filter and a subtraction circuit that subtracts the nonlinear circuit output from an input signal that has passed through a delay circuit having approximately the same amount of delay as the amount of delay generated by the nonlinear circuit; This is a phase linear nonlinear de-emphasis circuit configured to include a switch circuit for selectively outputting the output of the input TDM signal depending on whether the input TDM signal is a luminance signal or a chromaticity signal.

The invention of claim (5) is, in claim (1),
A transversal high-pass filter consisting of N delay elements (N is an integer of 2 or more) that extracts high frequency components included in the DM signal, a nonlinear circuit that limits the amplitude of the high frequency components, and a nonlinear circuit that A system having an adder circuit that adds a nonlinear circuit output to the filter intermediate tap output signal that has passed through a delay circuit having approximately the same amount of delay as the delay amount, and M delays that extract high frequency components included in the input TDM signal. A Herans-Herssal type bypass filter consisting of an element (M is an integer of 2 or more), a nonlinear circuit that limits the amplitude of the high frequency component, and a delay having approximately the same amount of delay as that generated by the nonlinear circuit. It has two systems: a system including an adder circuit that adds the nonlinear circuit output to the filter intermediate tap output signal that has passed through the circuit, and the output of the two systems is input to the luminance signal time and color included in the TDM newsletter. The device is configured to have a switch circuit for selectively outputting the signal depending on the degree signal.
This is a phase linear type non-linear emphasis circuit.

The invention of claim (6) provides that, in claim (2), input 1
” A transverse reel type high-pass filter consisting of N delay elements (N is an integer of 2 or more) that extracts high frequency components contained in the DM signal, a nonlinear circuit that limits the amplitude of the high frequency component, and the nonlinear circuit. a system having a subtraction circuit that subtracts the nonlinear circuit output from the filter intermediate tap output signal that has passed through a delay circuit having approximately the same amount of delay as that generated by the input T''I);
A transvarial high-pass filter consisting of M delay elements (M is an integer of 2 or more) that extracts high frequency components contained in M signals, a 31゜ linear circuit that limits the amplitude of the high frequency components, and the nonlinear circuit. The system includes a subtraction circuit that correlates the nonlinear circuit output from the filter intermediate tap output signal that has passed through a delay circuit having approximately the same amount of delay as that generated in the above two systems. This is a phase linear non-linear de-emphasis circuit configured to include a switch circuit for selectively outputting the output of the system depending on the luminance signal or chromaticity signal included in the input TDM signal.

The invention of claim (7) is defined as claim (3) or claim (5).
) is a phase linear type nonlinear emphasis circuit configured so that the delay element constituting the transversal type high-pass filter is shared by two systems.

The invention of claim (8) is defined as claim (4) or claim (6).
) is a phase linear non-linear de-emphasis circuit configured so that the delay element constituting the transversal high-pass filter is shared by two systems.

The invention of claim (9) provides a phase linear type non-linear emphasis circuit according to claim (1) and a phase linear type non-linear de-emphasis circuit according to claim (8), in which a delay element constituting a transvarial high-pass filter is provided. These are a phase-linear type non-linear emphasis circuit and a phase-linear type non-linear de-emphasis circuit configured to be used in both an emphasis circuit and a de-emphasis circuit.

Operation The present invention secures the necessary S/N by setting emphasis constants individually for the luminance signal and chromaticity signal included in the input TDM signal by performing non-linear emphasis processing in a time-sharing manner using the above-described configuration. Furthermore, in phase-linear nonlinear emphasis circuits, the delay elements that make up the transversal high-pass filter can be shared between the luminance signal processing system and chrominance signal processing system, as well as the emphasis side and de-emphasis side. The present invention provides a nonlinear emphasis circuit and a de-emphasis circuit that can be made smaller in size by doing so, and the effects thereof are significant.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram in an embodiment of the invention of claim (1).

In Figure 1, the TDM (time division multiplexed) signal input to input terminal 1 is divided into two systems: nonlinear emphasis circuit 2 for Y (luminance signal) and nonlinear emphasis circuit 2 for C (chromaticity signal). The signal is supplied to the emphasis circuit 4. The output signal of the Y nonlinear emphasis circuit 2 is combined in delay time with the output signal of the C nonlinear emphasis circuit 4 by a delay circuit 3, and then supplied to the switch circuit 5.

The switch circuit 5 uses a control signal supplied from another input terminal 6 to output the output signal of the delay circuit 3 when the TDM signal is a luminance signal, and the output signal of the C nonlinear emphasis circuit 4 when the TDM signal is a chromaticity signal. is configured to be supplied to the output terminal 7.

In this embodiment, the switch circuit 5 is connected to the output terminal 7.
However, it was placed directly after input terminal 1, and the TDM
When the signal is a luminance signal, the signal may be supplied to the Y nonlinear emphasis circuit 2, and when it is a chrominance signal, the signal may be supplied to the C nonlinear emphasis circuit 4.

Further, this configuration is effective in both analog and digital systems.

FIG. 2 is a block diagram in an embodiment of the invention of claim (2).

In FIG. 2, the emphasized TD input to the input terminal 8
The M signal is divided into two systems: Y nonlinear de-emphasis circuit 9 and C non-linear de-emphasis circuit 1.
1. The output signal of the Y non-linear de-emphasis circuit 9 is combined in delay time with the output signal from the C-use non-linear de-emphasis circuit 11 by a delay circuit 10, and then supplied to the muco switch circuit 12.

The switch circuit 12 uses a control signal supplied from an input terminal 13 to output the output signal of the delay circuit 10 when the TDM signal to be emphasized is a luminance signal, and output the output signal of the C nonlinear de-emphasis circuit 11 when the signal is a chromaticity signal. A signal is supplied to the output terminal 14. In this embodiment, the switch circuit 12 is placed immediately before the output terminal 14, but it is placed immediately after the input terminal 8, and when the luminance signal is the TDM signal to be emphasized, the color signal is sent to the Y nonlinear de-emphasis circuit 9. When the signal is a degree signal, the signal may be supplied to the C nonlinear de-emphasis circuit 11.

Further, this configuration is effective in both analog and digital systems.

FIG. 3 is a bronch diagram in an embodiment of the invention of claim (3).

In FIG. 3, the TDM signal supplied to the input terminal 15 is simultaneously supplied to two systems of phase linear nonlinear emphasis circuits, one for luminance signals and one for chromaticity signals. As for the chromaticity signal system, one is supplied to the delay circuit I6, and the other is supplied to the transversal type C high-pass filter 18. High pass filter 18 for transversal type C
extracts the high frequency components contained in the input signal.
Its phase characteristics are flat. The amplitude of this high-pass filter output is limited by a limiter (nonlinear circuit) 19.

The output signal of the limiter 19 is supplied to an addition amount adjustment circuit 20. The addition amount adjustment circuit 20 is a circuit that amplifies or attenuates the output signal of the limiter 19 by a certain magnification depending on a desired amount of emphasis. The output signal of the addition amount adjustment circuit 20 is added to the signal that has passed through the delay circuit 6 by an adder 17.

The delay circuit 16 corrects so that there is no time difference between the input signal and the output J signal of the addition amount adjustment circuit 20.

Regarding the luminance signal system, one side goes to the delay circuit 22, and the other side goes to the transversal type Y high-pass filter 24.
supplied to The transpersal type Y high-pass filter 24 extracts high frequency components contained in the input signal, and its phase characteristic is flat. The amplitude of this signal is limited by a mink 25 at the output of the high-pass filter 24.

The output signal of the limiter 25 is supplied to the addition amount adjustment circuit 2G. The addition amount adjustment circuit 26 is a circuit that amplifies or attenuates the output signal of the limiter 25 by a certain magnification depending on a desired amount of emphasis. The output signal of the addition amount adjustment circuit 26 is added to the signal that has passed through the delay circuit 22 by an adder 23. The delay circuit 22 corrects so that there is no time difference between the input signal and the output signal of the addition amount adjustment circuit 26.

The outputs of the adder 17 and the adder 23 are sent to the delay circuit 2, respectively.
1 and is supplied to the delay circuit 27. The delay circuit 21 and the delay circuit 27 each have a delay time of 0 to a certain time, and correct so that a time difference between the outputs of the adder 17 and the adder 23 does not occur. The outputs of the delay circuit 21 and the delay circuit 27 are supplied to a switch circuit 28. The switch circuit 28 is
By the control signal supplied from the input terminal 29, the TDM
When the signal is a luminance signal, the output signal of the delay circuit 27 is supplied to the output terminal 30, and when the signal is a chromaticity signal, the output signal of the delay circuit 21 is supplied to the output terminal 30.

In this embodiment, the switch circuit 28 outputs ◇:
Although it was placed immediately before the input terminal I5, it is placed immediately after the input terminal I5, and when the brightness signal is a TDM signal, the system for the brightness signal, that is, the delay circuit 22, and the HPF 2 for the transversal type Y.
4, in the case of a chromaticity signal, the system for chromaticity signal, that is, the delay circuit 1
6 and transversal type C HP F l 8.

Further, this configuration is effective for both analog and digital systems.

FIG. 4 is a block diagram in an embodiment of the invention of claim (4).

In FIG. 4, the emphasized T supplied to the input terminal 31
The DM signal is first simultaneously supplied to two phase linear nonlinear emphasis circuits, one for luminance signals and one for chromaticity signals. Regarding the chromaticity signal system, one is supplied to a delay circuit 32, and the other is supplied to a transversal type C high-pass filter 34. 1 to Lanceversal type C bypass filter 34 extracts high frequency components contained in the input signal, and its phase characteristic is flat. The amplitude of this high-pass filter output is limited by the mink 35.

The output signal of the limiter 35 is supplied to the subtraction adjustment circuit 3G. The subtraction adjustment circuit 36 is a circuit that amplifies or attenuates the output signal of the limiter 35 by a certain factor depending on a desired de-emphasis amount. The output signal of the subtraction adjustment circuit 36 is subtracted from the signal passed through the delay circuit 32 by a subtracter 33. The delay circuit 32 corrects so that there is no time difference between the input signal and the output signal of the inter-subtraction adjustment circuit 36.

As for the luminance signal system, one goes to the delay circuit 38, and the other goes to the transversal type Y high-pass filter 40.
supplied to 1 to Lanceversal type Y bypass filter 40 extracts high frequency components contained in the input signal, and its phase characteristic is flat. The output of this high-pass filter 40 is amplitude limited by a limiter 41. The output signal of the limiter 41 is supplied to an inter-subtraction adjustment circuit 42. The subtraction adjustment circuit 42 is a circuit that amplifies or attenuates the output signal of the limiter 41 by a certain factor in accordance with the desired de-emphasis. The output signal of the subtraction adjustment circuit 42 is subtracted from the signal passed through the delay circuit 38 by a subtracter 39. The delay circuit 38 corrects so that there is no time difference between the input signal and the output signal of the inter-subtraction adjustment circuit 42. The outputs of the subtracter 33 and the subtracter 39 are
The signals are supplied to delay circuit 37 and delay circuit 43, respectively. The delay circuit 37 and the delay circuit 43 each have a delay time of 0 to a certain time, and correct so that a time difference between the outputs of the subtracter 33 and the subtracter 39 does not occur.

The outputs of the delay circuit 37 and the delay circuit 43 are connected to the switch circuit 44.
supplied to The switch circuit 44 outputs the output signal of the delay circuit 43 when the TDM signal to be emphasized is a luminance signal, and outputs the output signal of the delay circuit 37 when the signal is a chromaticity signal, according to a control signal supplied from an input terminal 45. It supplies 4G.

In this embodiment, the switch circuit 44 is placed immediately before the output terminal 46, but it is placed immediately after the input terminal 31.
When the luminance signal in the TDM signal to be emphasized is a luminance signal system, that is, the delay circuit 38 and the HPF 40 for transversal type Y, when it is a chromaticity signal, it is sent to the chromaticity signal system, that is, the delay circuit 32 and for transversal type C. HP F
It is also possible to supply a signal to 34.

Further, this configuration is effective in both analog and digital systems.

The embodiments of the invention claimed in claims (5) and (6) are modifications of the configurations of the embodiments claimed in claims (3) and (4). In claims (3) and (4), as shown by the broken line in FIG. , claim (5) and claim (6)
), the output of the addition amount (subtraction amount) adjustment circuit 63 is the intermediate tap output (output side of the delay element 50) of the transversal filter, as shown by the dashed line in FIG.
Addition and subtraction are performed between the two, and can be easily realized. In this case, the delay time of the delay circuit 64 can be significantly shortened, which is particularly effective when an analog delay line is used. Hereinafter, the examples will be omitted because they are similar to the examples of claims (3) and (4).

Furthermore, this configuration is effective for both analog and digital systems.

FIG. 6 is a block diagram in an embodiment of the invention of claim (7).

In FIG. 6, the TDM signal supplied to the input terminal 67 is a chromaticity signal composed of delay elements 68 to 73, adders 85 to 87 and 93, coefficient circuits 88 to 90, and inversion circuit 91. 1-Lance Parsal type high-pass filter.

A high-pass filter output is then obtained as the output of the adder 93. This transversal high-pass filter extracts high frequency components contained in an input signal, and its phase characteristics are flat. The amplitude of this high-pass filter output is limited by a limiter 94. limiter 94
The output signal is supplied to the addition amount adjustment circuit 95. The addition amount adjustment circuit 95 is a circuit that amplifies or attenuates the output signal of the limiter 94 by a certain magnification depending on a desired amount of emphasis. The output signal of the addition amount adjustment circuit 95 is added to the signal that has passed through the delay circuit 92 by an adder 96. The delay circuit 92 corrects so that there is no time difference between the filter intermediate tap output signal and the output signal of the addition amount adjustment circuit 95.

Meanwhile, at the same time, the TDM signal supplied to input terminal 67 is transmitted to delay elements 69 to 72, adders 74, 75, and 80, coefficient circuits 76 and 77, and inverting circuit 78.
A transversal type high-pass filter for the luminance signal is supplied with a high-pass filter output. The high-frequency component contained in the input signal is extracted, and its phase characteristic is flat.The output of this high-pass filter is amplitude-limited by a limiter 81.The output signal of the limiter 81 is supplied to an addition amount adjustment circuit 82. Ru.

The addition amount adjustment circuit 82 is a circuit that amplitudes or attenuates the output signal of the limiter 81 by a certain magnification depending on a desired amount of emphasis. The output signal of the addition amount adjustment circuit 82 is added to the signal that has passed through the delay circuit 79 by an adder 83. The delay circuit 79 corrects so that there is no time difference between the filter intermediate tap output signal and the output signal of the addition R adjustment circuit 82.

The outputs of the adder 83 and the adder 96 are sent to the delay circuit 8, respectively.
4 and is supplied to the delay circuit 97. The delay circuit 84 and the delay circuit 97 each have a delay time of 0 to a certain time, and are used to correct so that a time difference between the outputs of the adder 83 and the adder 96 does not occur. The outputs of delay circuit 84 and delay circuit 97 are supplied to switch circuit 98 . The switch circuit 98 is
By the control signal supplied from the input terminal 99, the TDM
When the signal is a luminance signal, the output signal of the delay circuit 84 is supplied to the output terminal 100, and when the signal is a chromaticity signal, the output signal of the delay circuit 97 is supplied to the output terminal 100.

Note that similar effects can be obtained even with the configuration shown in FIG.

Further, the input signals of the delay circuits 79 and 92 in FIG. 6 and the delay circuits 141 and 142 in FIG. 8 may be supplied from the input terminal 67.

Further, this configuration is effective in both analog and digital systems.

FIG. 7 is a block diagram in an embodiment of the invention of claim (8).

In FIG. 7, the emphasized TDM signal supplied to input terminal 101 is transmitted to delay elements 102 to 109, adders 123 to 126 and 133, and coefficient circuits 127 to 13.
0, and an anti-i circuit 131, which is supplied to a transversal high-pass filter for chromaticity signals. A high-pass filter output is then obtained as the output of the adder 133. This transversal high-pass filter extracts high frequency components contained in an input signal, and its phase characteristics are flat. The amplitude of this high-pass filter output is limited by a limiter 134. The output signal of the limiter 134 is supplied to a subtraction amount adjustment circuit 135. The subtraction amount adjustment circuit 135 is a circuit that amplifies or attenuates the output signal of the limiter 134 by a certain factor depending on a desired de-emphasis amount. Subtraction N adjustment circuit 13
The output signal No. 5 is subtracted from the signal passed through the delay circuit 132 by a subtracter 136. The delay circuit 132 corrects so that there is no time difference between the filter intermediate tap output signal and the output I/H signal of the relative arithmetic adjustment circuit 135.

Meanwhile, at the same time, the emphasized TDM signal supplied to the input terminal 101 is transmitted to the delay elements 103 to 108, the adders 110 to 112 and 118, and the coefficient circuit 11.
3 to 115 and an inverting circuit 116, the transversal type high-pass filter for luminance signals is also supplied.

A high-pass filter output is then obtained at the output of the adder 118. This 1 to lance bar to Knoll type bypass filter extracts high frequency components contained in the input signal, and its phase characteristic is flat. The amplitude of this high-pass filter output is limited by a limiter 119. The output signal of the limiter 119 is supplied to a subtraction amount adjustment circuit 120. The subtraction amount adjustment circuit 120 is a circuit that amplifies or attenuates the output signal of the limiter 119 by a certain factor depending on a desired de-emphasis amount. Subtraction amount adjustment circuit 12
The output signal of 0 is subtracted from the signal passed through the delay circuit 117 by a subtracter 121 . The delay circuit 117 corrects so that there is no time difference between the filter intermediate tap output signal and the output signal of the subtraction amount adjustment circuit 120.

The outputs of subtracter 121 and subtracter 136 are supplied to delay circuit 122 and delay circuit 137, respectively.

The delay circuit 122 and the delay circuit 137 each have a delay time of 0 to - constant time, and correct so that a time difference between the outputs of the subtracter 121 and the subtracter 136 does not occur. The outputs of the delay circuit] 22 and the delay circuit 137 are connected to the switch circuit 138.
supplied to The switch circuit 138 has an input terminal 139
The emphasized TD
When the M signal is a luminance signal, the output signal of the delay circuit 122 is supplied to the output terminal 140, and when it is a chromaticity signal, the output signal of the delay circuit 137 is supplied to the output terminal 140.

Note that similar effects can be obtained even with the configuration shown in FIG.

Further, the input signals of the seventh delay circuit 117 and 132 and the delay circuits 145 and 146 in FIG. 9 may be supplied from the input terminal 101.

Further, this configuration is effective in both analog and digital systems.

As stated in claim (9), in the phase linear type non-linear emphasis circuit and the phase point Ha type non-linear de-emphasis circuit, the delay element constituting the transversal type high-pass filter is used in the emphasis circuit and the de-emphasis circuit. It is also easily possible to share the circuit, and in this case, the present invention can significantly reduce the size of the circuit.

Further, this configuration is effective in both analog and digital systems.

Effects of the Invention As is clear from the above embodiments, according to the present invention, by time-sharing nonlinear emphasis processing, emphasis constants are set individually for the luminance signal and chromaticity signal of the input TDM signal, and necessary In addition, in a phase-linear type non-linear emphasis circuit, the delay elements that make up the transversal type high-pass filter are connected to the luminance signal processing system, the chromaticity signal processing system, and the emphasis side. The present invention provides a nonlinear emphasis circuit and a de-emphasis circuit that can be used in common on the de-emphasis and de-emphasis sides to reduce the size of the circuit, and the effect is significant.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the invention of claim (1), Fig. 2 is a block diagram of an embodiment of the invention of claim (2), and Fig. 3 is a block diagram of an embodiment of the invention of claim (3). FIG. 4 is a block diagram of an embodiment of the invention according to claim (4), and FIG. 5 is a block diagram of an embodiment of the invention according to claim (5) and claim (6). Block diagrams, FIGS. 6 and 8 are block diagrams of an embodiment of the invention of force, and FIGS. 7 and 9 are block diagrams of an embodiment of the invention of claim (8). The figure is a block diagram of a conventional example of a phase-linear nonlinear enhancement circuit.
FIG. 11 is a block diagram of a conventional example of a phase linear nonlinear de-emphasis circuit. 2...Nonlinear emphasis circuit for Y (luminance signal), 4...Nonlinear emphasis circuit for C (chromaticity signal), 3...Delay circuit, 5...
...Switch circuit, 9...Nonlinear de-emphasis circuit for Y, 10...Delay circuit, 11.
...Nonlinear de-emphasis circuit for C, 12
...Switch circuit, 1.6.22...
Delay circuit, 17.23... Adder, 18...
...For transformer high-→norm type C, HPF, 192
5...Limiter, 24...Transversal type Y HP T? , 28... switch circuit, 32.38... delay circuit, 33.39...
...Subtractor, 34...Transversal type C
IIPF, 35, 4]...Limiter, 40.
...HP F, 44 for transversal type Y...
...Switch circuit, 48-53...Delay element, 62...Limiter, 64...Delay circuit, 65...Addition (subtraction) Vessel, 68-・73・
...Delay element, 94.81...Limiter, 79° path, 98...Switch circuit, 10 delay element, 119,134...136... ...
- Subtractor, 117.13138...Switch circuit, 141145.146...Delay circuit.

Claims (9)

[Claims] (1) A nonlinear emphasis circuit that has means for time-divisionally processing input signals. (2) A nonlinear de-emphasis circuit having means for time-divisionally processing an input signal. (3) a transversal high-pass filter consisting of N delay elements (N is an integer of 2 or more) for extracting high frequency components contained in the input TDM signal; a nonlinear circuit for limiting the amplitude of the high frequency components; a system having an adder circuit that adds a nonlinear circuit output to an input signal that has passed through a delay circuit having approximately the same amount of delay as that generated by a high-pass filter and the nonlinear circuit; A transversal high-pass filter consisting of M delay elements (M is an integer of 2 or more) to be taken out, a nonlinear circuit that limits the amplitude of its high frequency component, and a delay occurring in the transversal high-pass filter and the nonlinear circuit. The system has two systems: a system having an adder circuit that adds the output of the nonlinear circuit to the input signal that has passed through the delay circuit with almost the same amount of delay as the amount of delay, and the output of the two systems is used as the luminance signal of the input TDM signal. 2. The nonlinear emphasis circuit according to claim 1, further comprising a switch circuit for selectively outputting a chromaticity signal depending on the time of the chromaticity signal, and having a phase linear type. (4) a transversal high-pass filter consisting of N delay elements (N is an integer of 2 or more) for extracting high frequency components contained in the input TDM signal; a nonlinear circuit for limiting the amplitude of the high frequency components; a subtraction circuit that subtracts a nonlinear circuit output from an input signal that has passed through a delay circuit having approximately the same amount of delay as that generated by a high-pass filter and the nonlinear circuit; A transversal high-pass filter consisting of M delay elements (M is an integer of 2 or more) to be taken out, a nonlinear circuit that limits the amplitude of its high frequency component, and a delay occurring in the transversal high-pass filter and the nonlinear circuit. The system has two systems: a subtraction circuit that subtracts the nonlinear circuit output from the input signal that has passed through the delay circuit with approximately the same delay amount as the input TDM signal, and the output of the two systems is used as the luminance signal of the input TDM signal. 3. The non-linear de-emphasis circuit according to claim 2, wherein the non-linear de-emphasis circuit is of a phase linear type and includes a switch circuit for selectively outputting the chromaticity signal. (5) A transversal high-pass filter consisting of N delay elements (N is an integer of 2 or more) that extracts high frequency components contained in the input TDM signal, a nonlinear circuit that limits the amplitude of the high frequency component, and the nonlinear circuit. a system having an adder circuit that adds a nonlinear circuit output to the filter intermediate tap output signal that has passed through a delay circuit having approximately the same amount of delay as that generated by the input TDM signal; delay elements (M is 2
A transversal high-pass filter consisting of a transversal high-pass filter (an integer greater than or equal to 100%), a nonlinear circuit that limits the amplitude of the high frequency component, and a delay circuit with approximately the same amount of delay as that generated by the nonlinear circuit, and an intermediate part of the filter. It has two systems: a system including an adder circuit that adds the nonlinear circuit output to the tap output signal, and the outputs of the two systems are input T.
2. The nonlinear emphasis circuit according to claim 1, further comprising a switch circuit for selectively outputting a luminance signal and a chromaticity signal of the DM signal, and having a phase linear type. (6) A transversal high-pass filter consisting of N delay elements (N is an integer of 2 or more) that extracts high frequency components contained in the input TDM signal, a nonlinear circuit that limits the amplitude of the high frequency component, and the nonlinear circuit. a system having a subtraction circuit that subtracts a nonlinear circuit output from the filter intermediate tap output signal that has passed through a delay circuit having approximately the same amount of delay as the amount of delay that occurs in the input TDM signal; a transversal high-pass filter consisting of delay elements (M is an integer of 2 or more), a nonlinear circuit that limits the amplitude of the high frequency component, and a delay having approximately the same amount of delay as that generated by the nonlinear circuit. It has two systems: a subtraction circuit that subtracts the nonlinear circuit output from the filter intermediate tap output signal that has passed through the circuit, and the outputs of the two systems are used to input the TDM signal for the luminance signal and the chromaticity signal. 3. The non-linear de-emphasis circuit according to claim 2, further comprising a switch circuit for selectively outputting the output according to the phase linear de-emphasis circuit. (7) The nonlinear emphasis circuit according to claim (3) or claim (5), wherein the delay element constituting the transversal high-pass filter is shared by two systems. (8) The nonlinear de-emphasis circuit according to claim (4) or claim (6), wherein the delay element constituting the transversal high-pass filter is shared by two systems. (9) The non-linear emphasis circuit and non-linear de-emphasis circuit according to claim (7) or (8), wherein the delay element constituting the transversal high-pass filter is shared by the emphasis circuit and the de-emphasis circuit.