JPH05137081A - Device and method for reproducing transmission signal - Google Patents

Abstract

PURPOSE:To surely eliminate crosstalk between a reproduced video signal and a multiplex signal or the ghost of the multiplex signal by extracting a crosstalk signal between the multiplex signal and a video signal, and controlling the tap coefficient of a two-input wave equalization means. CONSTITUTION:The multiplex signal from an orthogonal synchronous detection circuit 112 and the video signal from a video detection circuit 107 are inputted to a two-input wave equalization circuit 118 via A/D conversion circuits 116, 117, respectively. A control part 123 outputs the control signal of the circuit 118 by processing the output signal of a wave extraction circuit 122 based on the identification signal of a sequence control part 121. The circuit 118 inputs the video signal under the control of the control part 123, and eliminates the crosstalk by controlling the tap coefficient located at a time when the crosstalk of the video signal included in the multiplex signal is generated. After that, the ghost is eliminated by controlling the tap coefficient located at a time when the ghost of the multiplex signal is generated, and the multiplex signal is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission system, and more particularly to a transmission signal reproducing apparatus and a transmission signal reproducing method which are effective for receiving a transmission signal which multiplexes another signal on a current television broadcast signal.

[0002]

2. Description of the Related Art As a method of multiplexing another signal on a television signal, a quadrature modulation in which a carrier having a quadrature relationship with a video carrier is modulated with other information and is combined with a video carrier modulated with the video signal for transmission. The scheme is known.

[0003] However, this method is based on the 1988 National Television Society National Conference Proceedings published by the Television Society of Japan, pages 329 to 330, page 15-8, "Examination of waveform equalization in the EDTV system with video carrier quadrature modulation". As discussed in (1), a signal having different information (hereinafter referred to as a signal to be multiplexed) due to imbalance of characteristics of filters on the transmitting side and receiving side, deviation of detection of the receiver, and ghost interference. Crosstalk occurs between the video signal and the multiplex signal). It is necessary to use a waveform equalization technique to remove this crosstalk.

An example of removing this crosstalk is described in Japanese Patent Application Laid-Open No. 63-109676.
Known reference signals are inserted into the video signal and the multiplexed signal in advance, and the two orthogonal signals are received on the receiving side.
Two demodulated signals separated and demodulated by synchronous detection with the axis detection phase are passed through two delay lines with taps,
It uses a two-dimensional transversal filter that synthesizes each delayed signal with an appropriate weight determined using the received reference signal.

An example of the reference signals known to the video signal and the multiplex signal is an example of 21--9 "Orthogonal" on pages 375 to 376 of the Proceedings of the 1990 National Conference of the Television Society published by the Television Society. As discussed in "Waveform Equalization of Wide Television System by Modulation", first-generation EDTV
The 8-field sequence transmitted by broadcasting is to transmit sinX / X in the same period for multiplex signals.

Regarding the reference signal of the 8-field sequence transmitted in the first generation EDTV broadcasting, the technical report VOL. 13, NO. 32 (June 1989), pp. 19-24, "GCR Signaling Specification Settings". In this paper, a sinX / X bar waveform is used as a reference signal (Ghost Cancel Reference) for ghost elimination.
This signal is called a ce signal and is hereinafter abbreviated as GCR signal), and is transmitted by a method called an 8-field sequence having a pattern in which the GCR signal and the pedestal signal make a cycle in 8 fields. The signal inserted in the previous line is VIT (V
optical interval test) signal, which has a fixed pattern in at least even and odd fields.

[0007]

However, in the above-mentioned prior art, a method of extracting crosstalk or the like generated between a reproduced video signal and a multiplexed signal, which corresponds to the 8-field sequence transmission method, is described. I didn't.

An object of the present invention is, in the case of an 8-field sequence transmission method, a reference signal of a video signal which crosstalks a reproduced multiplex signal from the video signal, and a reference of a multiplex signal which crosstalks a reproduced video signal from the multiplex signal. signal,
Alternatively, a method for stably extracting a reference signal of a reproduced multiplex signal and its ghost is shown, and a transmission signal reproduction device and a transmission signal reproduction method capable of reliably removing crosstalk or ghost are provided. It is in.

[0009]

In order to achieve the above-mentioned object, according to the present invention, the reproduced first signal and second signal are reproduced.
After inputting the signal of and delaying with the delay line with tap,
The second signal is combined with desired weights and the second signal is converted into the second signal.
The first two-input waveform equalizing means for removing crosstalk from the first signal included in the first signal and outputting the first reference signal from the reproduced first signal. A first waveform extracting means for extracting and outputting an existing signal portion, and the reproduced second signal or the first two
From the second signal output from the input waveform equalizing means,
Second waveform extracting means for extracting and outputting a first signal portion, which is included in the second signal as the crosstalk, in which the crosstalk signal based on the first reference signal exists, and the first waveform extracting means. The type or polarity of the first reference signal is identified from the output of the waveform extracting means, and a first control signal for extracting the crosstalk signal included in the first signal portion is generated from the identification result. Control signal generating means and the first signal portion output from the second waveform extracting means, and the crosstalk signal based on the output of the control signal generating means from the first signal portion. And a control means for setting the tap coefficient of the first two-input waveform equalization means.

Further, the reproduced second signal is input, delayed by a delay line with a tap, and then combined with a desired weight, and the second signal is added to the second signal. The ghost of the included second signal is removed, and output from the waveform equalizing means and the reproduced second signal or the second signal output from the waveform equalizing means. Second waveform extraction for extracting and outputting a ghost signal according to the second reference signal and a second signal portion in which the second reference signal exists, which is included in the second signal as the ghost Means and the output of the first waveform extracting means to identify the type or polarity of the first reference signal, and from the identification result, the second reference signal and the ghost included in the second signal portion. Control for generating a second control signal for extracting a signal Signal generating means and the second signal portion output from the second waveform extracting means are input, and the second reference signal is output from the second signal portion based on the output of the control signal generating means. And a control means for extracting the ghost signal and setting the tap coefficient of the waveform equalization means.

Furthermore, the regenerated first signal and second signal are input, delayed by a delay line with a tap, and then combined with desired weights to synthesize the first signal, Second two-input waveform equalizing means for removing crosstalk from the second signal included in the first signal and outputting the same, and the reproduced first signal or the second signal. Of 2
From the first signal output from the input waveform equalizing means,
Second waveform extracting means for extracting and outputting a third signal portion, which is included in the first signal as the crosstalk, in which the crosstalk signal by the second reference signal exists, and the first waveform extracting means. The type or polarity of the first reference signal is identified from the output of the waveform extracting means, and a third control signal for extracting the crosstalk signal included in the third signal portion is generated from the identification result. Control signal generating means and the third signal portion output from the second waveform extracting means, and based on the output of the control signal generating means from the third signal portion, the crosstalk signal. And a control means for setting the tap coefficient of the second two-input waveform equalization means.

[0012]

The first waveform extracting means extracts the signal portion in which the first reference signal exists from the reproduced first signal.

The second waveform extracting means includes the first two
From the second signal output from the input waveform equalizing means,
From the first signal portion in which the crosstalk signal based on the first reference signal is present, which is included in the second signal as the crosstalk, or the second signal output from the waveform equalizing means. A second signal portion in which a ghost signal according to the second reference signal and the second reference signal, which are included in the second signal as the ghost, are present,
Alternatively, from the first signal output from the second two-input waveform equalizing means, there is a crosstalk signal based on the second reference signal, which is included in the first signal as the crosstalk. And a third signal portion.

The control signal generating means identifies the type or polarity of the first reference signal from the output of the first waveform extracting means, and based on the identification result, the cross included in the first signal portion. The type or polarity of the first reference signal is identified from the first control signal for extracting the talk signal or the output of the first waveform extracting means, and the second signal portion is identified from the identification result. A second control signal for extracting the second reference signal and the ghost signal included in, or identifying the type or polarity of the first reference signal from the output of the first waveform extracting means, And a third control signal for extracting the crosstalk signal included in the third signal portion from the identification result.

The control means inputs the first signal portion output from the second waveform extracting means, and based on the output of the first control signal generating means from the first signal portion, The crosstalk signal is extracted, or the second signal portion output from the second waveform extracting means is input, and based on the output of the second control signal generating means from the second signal portion. To extract the second reference signal and the ghost signal, or input the third signal portion output from the second waveform extracting means, and to output the control signal from the third signal portion. Based on the output of the generating means,
The crosstalk signal is extracted, and the tap coefficient of the first two-input waveform equalizer, the waveform equalizer, or the second two-input waveform equalizer is set.

Therefore, according to the present invention, the first and second control signals are generated based on the first reference signal included in the first signal, so that the first reference signal is generated. Is stably extracted, the crosstalk signal based on the first reference signal included in the second signal, the ghost signal based on the second reference signal included in the second signal, and the second reference signal The crosstalk signal based on the second reference signal included in the first signal can also be stably extracted.

Si when the first signal is a video signal and the first reference signal is an 8-field sequence transmission method.
If the nX / X bar GCR signal and the pedestal signal, the second signal is a multiplexed signal, and the second reference signal is a reference signal of the multiplexed signal, the multiplexed signal may be multiplexed at a lower level than the video signal. Since there are many, the sinX / X bar GCR signal is easier to detect than the reference signal of the multiplex signal.

As described above, it is possible to provide a transmission signal reproducing apparatus and a transmission signal reproducing method for video signals and multiplex signals, which can reliably remove crosstalk or ghost.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a transmission signal reproducing apparatus as a first embodiment of the present invention. In FIG. 1, a carrier wave having an orthogonal relationship with a video carrier wave is modulated with other information (hereinafter referred to as a multiplexed signal), and an 8-field sequence transmission method is used.
nX / X bar receives a transmission signal that is transmitted by being combined with a video carrier modulated with a video signal to which a GCR signal is added,
It is something to play.

In FIG. 1, 101 is an antenna and 102
Is a high frequency amplifier circuit, 103 is a frequency conversion circuit, 104 is a local oscillation circuit, 105 is a tuning control circuit, 106 is a Nyquist filter, 107 is a video signal detection circuit, 108 is an audio FM detection circuit, 109 is an audio signal output terminal, 110 is a video signal output terminal, 111 is a band pass filter (hereinafter,
(Abbreviated as BPF), 112 is a quadrature synchronous detection circuit, 113 is a timing generation circuit, 114 is a multiple signal output terminal, 11
5 is a low-pass filter (hereinafter abbreviated as LPF), 11
6, 117 are analog / digital conversion circuits (hereinafter referred to as A
/ D conversion circuit), 118 is a 2-input waveform equalization circuit,
Reference numeral 119 denotes a digital / analog conversion circuit (hereinafter referred to as D / A).
(Abbreviated as conversion circuit), 120 and 122 are waveform extraction circuits, 1
Reference numeral 21 is a sequence control unit, and 123 is a control unit.

A high frequency amplifier circuit 102 amplifies a television signal input from the antenna 101, and a frequency conversion circuit 103 converts it to an intermediate frequency for demodulation. The tuning of the television signal is performed by controlling the frequency of the local oscillation circuit 104 added to the frequency conversion circuit 103 by the tuning control circuit 105. From the converted intermediate frequency signal,
Nyquist filter 10 which has a Nyquist characteristic centered on a video signal carrier and extracts a video signal band
A signal in the video signal band is obtained at 6, and the video signal detection circuit 107
The signal is amplified and detected at to obtain a video signal at the video signal output terminal 110.

The audio signal band is amplified and detected by the audio FM detection circuit 108 from the video signal detection circuit 107 to obtain an audio signal at the audio signal output terminal 109.

In addition to the above, in order to demodulate a multiple signal,
The multiplexed signal band is extracted from the output of the frequency conversion circuit 103 by the BPF 111 having a symmetrical amplitude characteristic with respect to the video signal carrier, and is detected by the quadrature synchronous detection circuit 112 to obtain a multiplexed signal.

On the other hand, the video signal detected and demodulated by the video detection circuit 107 is passed through the LPF 115 to obtain a video signal in the same band as the multiplexed signal.

The video signal in the same band as the multiplexed signal and the multiplexed signal are converted into digital signals by A / D conversion circuits 116 and 117, respectively, and input to a 2-input waveform equalization circuit 118.

The two-input waveform equalization circuit 118 outputs a video signal in the same band as the multiplexed signal even if crosstalk from the video signal occurs in the multiplexed signal output from the quadrature synchronous detection circuit 112 due to a ghost or the like. By weighting according to the crosstalk, the crosstalk is removed and a good multiplexed signal is obtained.

The control of the 2-input waveform equalization circuit 118 is performed as follows. From the output of the 2-input waveform equalization circuit 118, the waveform extraction circuit 122 extracts the multiplexed signal of the sin X / X bar GCR signal period and the pedestal signal period sent from the transmitting side by the 8-field sequence transmission method.
In the multiplexed signal in this period, the sinX / X bar GCR signal of the video signal and the pedestal signal crosstalk due to various causes.

On the other hand, from the video signal in the same band as the multiplexed signal output from the A / D conversion circuit 116, sin X / X bar G
The waveform extracting circuit 120 extracts the CR signal and the pedestal signal. From the output of the waveform extraction circuit 120, the sequence control unit 121 identifies the cycle of the 8-field sequence and outputs the identification signal.

The control unit 123 processes the output signal of the waveform extraction circuit 122 based on the identification signal of the sequence control unit 121 and outputs the control signal of the two-input waveform equalization circuit 118.

The timing generation circuit 113 has the LPF 11
A field identification signal, a horizontal synchronizing signal, a vertical synchronizing signal, etc. are detected from the video signal in the same band as the multiplex signal which is five outputs, and the waveform extracting circuit 120, the sequence control unit 121, the waveform extracting circuit 122, the control unit 123, etc. Generate the timing signal of.

The embodiment of FIG. 1 has an effect that crosstalk from a video signal to a multiplexed signal can be removed with a simple structure. The input of the timing generation circuit 113 may be before the LPF 115.

In the transmission signal reproducing apparatus of FIG. 1, important processing blocks will be described below.

FIG. 2 illustrates one embodiment of the 2-input waveform equalization circuit 118. 2 (a) is a serial connection type,
FIG. 2B is a parallel connection type, and includes 201, 202, and 20.
7, 208 are input terminals, 203, 209 are output terminals, 2
Reference numerals 04, 206, 210 and 211 denote transversal filters (hereinafter abbreviated as TRF), and 205 and 212 denote addition circuits. First, the transversal filters 204, 2
06, 210 and 211 will be described.

301 is an input terminal, 302 is an output terminal, 3
Reference numerals 03 to 308 are delay circuits, 309 to 315 are multiplication circuits, 316 to 323 are addition circuits, and K1 to K7.
Is a tap coefficient of the multiplication circuit.

The transversal filter of FIG. 3 is a general block diagram, in which the tap coefficients K1 to K7 of the multiplication circuits 309 to 315 connected to the delay circuits 303 to 308 are given according to the distortion generation time of the input. Adder circuit 3
Distortion is removed by adding from 16 to 323.

That is, the transversal filter of FIG. 3 has a function of removing distortion of each input signal.

In the two-input waveform equalization circuit of FIG. 2A, a multiplexed signal is input from the input terminal 201 and a video signal is input from the input terminal 202, and the TRF 204 causes crosstalk of the video signal included in the multiplexed signal. The tap coefficient located at time is controlled to create a signal having a phase opposite to the crosstalk of the video signal, and the addition circuit 205 adds the signal to the multiplexed signal to remove the crosstalk. After that, the TRF 206 controls the tap coefficient located at the occurrence time of the ghost of the multiple signal,
Create a signal with the opposite phase to the multiplex signal, remove the ghost,
The multiplexed signal is obtained at the output terminal 203.

In the two-input waveform equalization circuit of FIG. 2B, the video signal from the input terminal 208 is added to the multiplexed signal with the input terminal 207 by the adder circuit 212, and the crosstalk from the multiplexed video signal is generated. Can be removed and output to the output terminal 209. Also, although the calculation of the tap coefficient becomes complicated, crosstalk from the video signal of the multiplexed signal is removed by the video signal from which distortion such as ghost of the video signal has been removed,
Further, it is possible to obtain the multiplexed signal from which distortion caused by the ghost of the multiplexed signal is removed at the output terminal 209. here,
The reference signal of the video signal added to the transmission signal to be received and reproduced and the reference signal of the multiplexed signal will be described with reference to FIG.

FIG. 4 shows sinX of the 8-field sequence transmission method implemented in the current clear vision broadcasting.
/ X bar GCR signal and pedestal signal are shown by waveforms from S1 to S8, and an example of a reference signal for multiple signals is shown from P1 to P
Shown by 8.

The numbers S1 to S8 and P1 to P8 indicate fields, and the reference signal of the video signal is 8 fields.
The reference signal of the multiplex signal has one cycle in four fields.

The waveform of the reference signal of the multiplexed signal will be described with reference to FIG. 5 (a) is a sinX / X signal having the same band as the multiplexed signal, and FIG. 5 (b) delays the sinX / X waveform of FIG. It is a thing. FIG. 5C is obtained by subtracting the waveform of FIG. 5B from the waveform of FIG. It should be noted that the fixed time T takes a value that is the reciprocal of the band of the multiplexed signal.

Here, the waveform of FIG. 5C is used as the waveform of the reference signal of the multiplex signal, and will be referred to as an orthogonal GCR signal hereinafter. The characteristic of the quadrature GCR signal is that it has no DC component.

In P1 to P8 of FIG. 4, FIG.
If the waveform having the same polarity as the waveform of No. 2 is indicated by + and the waveform of the opposite characteristic is indicated by-, 8 fields are transmitted in the order of +-+++-+.

The reference signal shown in FIG. 4 is extracted using the following arithmetic expression. Sgcr = (1/4) {(S1-S5) + (S6-S2) + (S3-S7) + (S8-S4)} (Equation 1) Pgcr = (1/4) {(P1-P3) + (P4-P2) + (P5-P7) + (P8-P6)} (Equation 2) where Sgcr is the reference signal of the video signal after calculation (hereinafter referred to as the video signal reference signal), Pgcr Is a reference signal of the multiplexed signal after calculation (hereinafter referred to as a reference signal for multiplexed signal).

By performing the operations of (Equation 1) and (Equation 2), the influence of crosstalk between the video signal and the multiplex signal is canceled, and the reference signal for the video signal and the reference signal for the multiplex signal are independently provided. Can be extracted. FIG. 6 shows an embodiment of the sequence control unit 121 and the control unit 123 corresponding to the reference signal of FIG.

The same reference numerals as those in FIG.
Is a video signal waveform input terminal, 602 is a multiple signal waveform input terminal, 603 is a tap coefficient output terminal, 604 is a bar waveform detection unit, 605 is a sequence detection unit, 606 and 613 are polarity normalization units, and 607 and 614 are addition units. , 608, 615
Is a waveform storage unit, 609 and 616 are switch units, 610 is a 1-clock difference unit, 611 is a tap coefficient setting unit, 61
2, 618 is a sequence counter unit, 617 is a waveform reproducing unit, 619 is a video signal crosstalk reproducing unit of a video signal reference signal, 620 is a multiple signal reference signal reproducing unit, 621.
Is an output signal of the bar waveform detection unit 604, 622 is an output signal of the sequence detection unit 605 input to the sequence counter units 612 and 618, and 623 is an output signal of the sequence detection unit 605 input to the polarity normalization unit 613. ..

The operation of FIG. 6 will be described with reference to FIG. Figure 7
6 is a timing chart for explaining the operation of FIG.

FIG. 7A shows a field identification signal generated by the timing generation circuit 113, FIG. 7B shows an output signal 621 of the bar waveform detecting section 604, and FIG. 7C shows sequence counter sections 612 and 618. The output signal 622 of the sequence detection unit 605 that is input, and FIG. 7D is the output signal 623 of the sequence detection unit 605 that is input to the polarity normalization unit 613.

In FIG. 6, the output of the waveform extraction circuit 120 is input to the video signal waveform input terminal 601, and the bar waveform detection unit 604 detects the field in which the sinX / X bar GCR signal is inserted. That is, in FIG. 4, S1,
The portions S3, S6 and S8 are detected. The output of the bar waveform detection unit 604 is input to the sequence detection unit 605.

In the sequence detector 605, the signal 6 having one cycle in 8 fields S1 to S8 in FIG.
22 is generated. For example, in FIG. 7, FIG.
7 is obtained by taking the exclusive OR of the field identification signal of FIG. 7 and the output signal 621 of the bar waveform detection unit of FIG.
4 field HIGH as in (c), 4 field L
A signal 622 having one cycle in 8 fields of OW is obtained.

Further, the sequence detector 605 generates a signal 623 for discriminating between a waveform having the same polarity as the waveform of FIG. 5C and a waveform having the opposite polarity. In FIG. 4, P1, P
3, P5, P8 (S1, S3, S5, S8) field portions and P2, P3, P6, P7 (S2, S3, S
6, S7) field portion. For example, signal 62
3 is obtained by setting the signal of FIG. 7 (c) to the opposite polarity and delaying it by 2 fields in FIG.

On the other hand, the output of the waveform extraction circuit 122 is input to the multiplex signal waveform input terminal 602 and sent to the video signal crosstalk reproduction section 619 and the multiplex signal reference signal reproduction section 620.

In the video signal crosstalk reproducing section 619,
The same operation as that for reproducing the video signal reference signal is performed. That is, the processing is the same as the calculation of (Equation 1).

The polarity normalization unit 606 receives the signal 621 and sets the polarity of the sinX / X bar GCR signal during the period to the positive polarity and the polarity during the pedestal signal to the negative polarity.

The output signal of the polarity normalization unit 606 is added to the addition unit 6
07, the output of the waveform storage unit 608 is added, and the result is stored in the waveform storage unit 608 to perform integration processing.

The sequence counter unit 612 receives the signal 62
2, the number of fields is measured from the beginning of the 8-field sequence, the waveform storage unit 608 is reset by a multiple of 8, the switch unit 609 is closed, and the signal that has been integrated and stored until then is sent to the 1-clock difference unit 610. Forward.

By the above 8-field sequence operation, the crosstalk of the orthogonal GCR signal is erased,
The video signal crosstalk reproducing unit 619 extracts the video signal crosstalk of the video signal reference signal without crosstalk from the multiplexed signal.

The one-clock difference section 610 subtracts the signal one clock data before the input signal from the input signal, which is equivalent to the differential processing. By this processing, the sinX / X bar signal is converted into a sinX / X signal.

In the multiple signal reference signal reproducing section 620,
The same process as the calculation of (Equation 2) is performed to reproduce the multiple signal reference signal.

The polarity normalization unit 613 receives the signal 623 so that the polarities of the orthogonal GCR signals are all the same.
The input signal is rotated normally or inverted.

The output signal of the polarity normalizer 613 is added to the adder 6
14, the output of the waveform storage unit 615 is added, and the result is stored in the waveform storage unit 615 to perform integration processing.

The sequence counter section 618 outputs the signal 62
2 from the beginning of the 8-field sequence, or a half cycle of the 8-field sequence (4 fields)
The waveform storage unit 615 is reset at a multiple of 8 or a multiple of 4, and the switch unit 616 is closed, and the signal integrated and stored until then is transferred to the waveform reproduction unit 617.

By the above operation, the reference signal reproducing unit 620 for multiplex signal extracts the reference signal for multiplex signal without crosstalk from the video signal.

The waveform reproducing section 617 converts the reference signal for multiple signals into a sinX / X signal.

FIG. 8 shows an embodiment of the waveform reproducing section 617. Reference numeral 801 is an input terminal, 802 is an output terminal, 803 is a subtraction unit, and 804 is a delay unit. The delay time of the delay unit 804 is the same as that shown in FIG.

From the signal input from the input terminal 801,
A signal obtained by delaying the output of the subtraction unit 803 by the delay time 804 by the delay time T is subtracted by the subtraction unit 803. The process of FIG. 8 is the reverse process of the process of FIG.

In the tap coefficient setting unit 611, the video signal crosstalk of the video signal reference signal passed through the 1-clock difference unit 610 and the multiplexed signal reference signal passed through the waveform reproduction unit 617 are input, and the 2-input waveform, etc. The tap coefficient of the digitization circuit 118 is set.

According to the embodiment shown in FIG. 6, the sequence control unit 121 and the control unit 123 can be configured by a simple processing method, and the addition unit 607 and the waveform storage unit 608 can be used.
The calculation unit including the addition unit 614 and the waveform storage unit 615 has an effect of removing noise included in the signal by increasing the number of calculations. Note that, in FIG. 6, the signal path of the output signal of the timing generation circuit 113 is not shown for the sake of simplicity of the drawing.
In addition, the 1-clock difference unit 610 or the waveform reproduction unit 6
A configuration not using 17 is also possible.

FIG. 9 shows another embodiment of the sequence control section 121 and the control section 123 corresponding to the reference signal of FIG. The same reference numerals as those in FIGS. 1 and 6 denote the same functions.
Reference numerals 905 and 909 denote 4-field delay units, 902 and 90.
6, 912 are subtraction units, 903 is a polarity determination unit, 904 is a polarity timing unit, 907 and 913 are polarity normalization units, 90
Reference numerals 8 and 914 denote a noise removal unit, 910 a two-field delay unit, 911 an addition unit, 915 an output signal of the subtraction unit 902, 916 an output signal of the subtraction unit 912, 917 an output signal of the polarity determination unit 903, and 918 Polarity timing unit 90
4 output signal.

The operation of FIG. 9 will be described with reference to FIG. FIG. 10 is a timing chart for explaining the operation of FIG.

FIG. 10A shows the output signal 9 of the subtractor 902.
15, FIG. 10B shows an output signal 916 of the subtraction unit 912,
10C shows an output signal 917 of the polarity discriminating unit 903, and FIG. 10D shows an output signal 918 of the polarity timing unit 904.
Is.

In FIG. 9, the output of the waveform extraction circuit 120 is input to the video signal waveform input terminal 601, and the subtraction unit 902 outputs the signal of four fields before, which is the output of the four-field delay unit 901, from the input signal. Subtract. That is, the operation in () in (Equation 1) is performed, and sin
The difference between the X / X bar GCR signal and the pedestal signal is determined. This output signal 915 is a reference signal for video signals, but as shown in FIG.
The polarity is inverted between positive and negative depending on whether the pedestal signal is subtracted from the R signal or the sinX / X bar GCR signal is subtracted from the pedestal signal.

The polarity discriminating section 903 discriminates the polarity of the signal 915, as shown in FIG.

On the other hand, the output of the waveform extracting circuit 122 is input to the multiplex signal waveform input terminal 602 and sent to the video signal crosstalk reproducing section 619 and the multiplex signal reference signal reproducing section 620.

In the video signal crosstalk reproducing section 619,
The same operation as that for reproducing the video signal reference signal is performed. In FIG. 9, the same processing as that in () in (Equation 1) is performed.

4-field delay section 905 and subtraction section 906
Is the same as the operation of the 4-field delay unit 901 and the subtraction unit 902, and the crosstalk of the video signal reference signal is extracted from the output of the subtraction unit 906. However, like the signal 915, the polarity of the crosstalk of the video signal reference signal is inverted between positive and negative.

The polarity normalization unit 907 inverts the output signal of the subtraction unit 906 by using the signal 917 as a control signal, makes the crosstalk polarity of the video signal reference signal the same, and outputs it to the noise removal unit 908.

By the above operation, the crosstalk quadrature GCR signal is erased by subtraction processing with the signal delayed by four fields, so that the video signal crosstalk reproduction unit 6
At 19, the video signal crosstalk of the video signal reference signal without the crosstalk of the orthogonal GCR signal is extracted.

In the multiple signal reference signal reproducing section 620 of FIG. 9, the orthogonal GCR signal and the orthogonal GC delayed by 4 fields are used.
The R signal is subjected to addition processing, and further, the quadrature GCR signal delayed by two fields is subjected to subtraction processing, which is a method of reproducing the multiple signal reference signal. When a signal delayed by 4 fields is subjected to addition processing, a quadrature GCR signal having a double amplitude is obtained, and when subtraction processing is performed with a signal further delayed by 2 fields, a quadrature GCR signal having a quadruple amplitude is obtained.
The signal is obtained.

By this processing, even if the GCR signal of the video signal crosstalks, the crosstalked GCR signal is generated.
The signal can be erased.

The input output of the waveform extraction circuit 122 is
The adding section 911 adds the signal delayed by 4 fields by the 4 field delay section 909. Further, the subtraction unit 912 subtracts the signal delayed by two fields in the two-field delay unit 910 from the output of the addition unit 911.

The output signal 916 of the subtraction unit 912 is shown in FIG.
As shown in, the quadrature GCR signal is inverted into positive and negative. This polarity has one cycle in four fields of + --- and is synchronized with the eight-field sequence of the video signal. Utilizing this point, the polarity timing unit 904 produces the timing signal shown in FIG. 10D from the output signal 917 of the polarity determination unit 903 shown in FIG. 10C. As a control signal of the polarity normalization unit 913,
The polarity of the signal 916 shown in FIG.
The polarity of the CR signal is made constant, and the CR signal is output to the noise removing unit 914.

By the above operation, the multiple signal reference signal reproducing section 620 extracts the multiple signal reference signal without crosstalk from the video signal.

The noise removing sections 908 and 914 add and integrate the crosstalk of the video signal reference signal and the multiple signal reference signal, respectively, to remove the influence of noise.

According to the embodiment of FIG. 9, when the period of the 8-field sequence is detected, sinX / X bar GC
Since the difference signal between the R signal and the pedestal signal is used, the ghost of the horizontal synchronizing signal and the video signal GC are affected by the crosstalk of the orthogonal GCR signal or when there is a ghost.
Since it is possible to cancel the influence of the ghost of the video signal on the line before the R signal insertion line, there is an effect that the crosstalk of the video signal reference signal and the multiple signal reference signal can be stably extracted. .. In addition, in FIG.
In order to eliminate the complexity of the drawing, the timing generation circuit 11
The signal path of the output signal of No. 3 is not shown. In addition, the 1-clock difference unit 610 or the waveform reproduction unit 61
A configuration not using 7 is also possible.

Another embodiment of the present invention will be shown below in FIG. In FIG. 11, a carrier having an orthogonal relationship with a video carrier is modulated with other information (hereinafter referred to as a multiplexed signal), and is modulated with a video signal to which a sinX / X bar GCR signal is added by an 8-field sequence transmission method. It receives and reproduces a transmission signal that is synthesized with a video carrier and transmitted.

The same reference numerals as those in FIG.
Reference numeral 1 is a bandpass filter, and 1102 is a quadrature synchronous detection circuit. The difference from FIG. 1 is that the output of the Nyquist filter 106 has the same frequency characteristics as the BPF 111.
A quadrature synchronous detection circuit 1102 detects and demodulates through F1101 to obtain a video signal in the same band as the multiplexed signal. The quadrature synchronous detection circuit 1102 simultaneously detects and demodulates the multiplexed signal from the output of the BPF 111.

The demodulated video signal in the same band as the multiplexed signal and the multiplexed signal are respectively the A / D conversion circuits 116 and 1
It is output to 17.

The output of the quadrature synchronous detection circuit 1102,
Video signals in the same band as the multiplexed signal are simultaneously output to the timing generation circuit 113.

In the embodiment shown in FIG. 11, the video signal output terminal 1
Since the video signal output from 10 and the video signal in the same band as the multiplex signal used for crosstalk removal can be detected independently, there is an effect that each can be demodulated with optimum performance. The timing generation circuit 1
The input of 13 may be a video signal output from the video signal detection circuit 107.

Another embodiment of the present invention is shown in FIG. Figure 1
Reference numeral 2 is an image in which a carrier having an orthogonal relationship with a video carrier is modulated with other information (hereinafter referred to as a multiplexed signal), and the video is modulated with a sinX / X bar GCR signal added by an 8-field sequence transmission method. It receives and reproduces a transmission signal that is transmitted by being combined with a carrier wave.

The same reference numerals as those in FIGS. 1 and 11 denote the same functions, and 1201 is an analog / digital conversion circuit (hereinafter,
(Abbreviated as A / D conversion circuit) 1202 is a waveform equalization circuit, 1
Reference numeral 203 denotes a digital / analog conversion circuit (hereinafter referred to as D / A).
1204 is a control unit.

The embodiment of FIG. 12 is similar to the embodiment of FIG. 1 except that the video signal output from the video signal detection circuit 107 is
Converted into a digital signal through the D conversion circuit 1201,
The waveform equalization circuit 1202 removes ghosts and corrects the waveform distortion due to the transmission line characteristics, and outputs it through the D / A conversion circuit 1203. In response to this, the waveform extraction circuit 120 extracts the sinX / X bar GCR signal and the pedestal signal from the output of the waveform equalization circuit 1202, and the sequence control unit 121 of FIG. It is also used as a control unit 1204 that controls the above.

In the embodiment shown in FIG. 12, since the control section of the waveform equalizing circuit for the video signal can identify the period of the 8-field sequence of the video signal and the like to obtain the identification signal, an efficient circuit configuration can be obtained. There is an effect that can be. The input of the timing generation circuit 113 is an LPF.
A video signal in the multiple signal band which is the output of 115 may be used.

FIG. 13 shows the waveform equalizing circuit 1202 of FIG.
FIG. Reference numeral 1301 is an input terminal, 1302 is an output terminal, 1303 and 1305 are transversal filters (hereinafter abbreviated as TRF), and 1304 is an adder circuit. The TRFs 1303 and 1305 have the configuration shown in FIG. 3, for example.

A video signal is input from the input terminal 1301,
TRF1303 recursive filter from -1μs to + 1μ
The proximity ghost of about s is removed, and then the adder circuit 13
04 and TRF1305 with a recursive filter +
The ghost of about 1 μs to +40 μs is removed.

The embodiment of FIG. 13 has the effect of suppressing the generation of grandchild ghosts and removing ghosts.

An example of the control unit 1204 shown in FIG. 12 is shown in FIG. The same reference numerals as those in FIG. 6 indicate the same functions, and 1
401 is a polarity normalization unit, 1402 is an addition unit, 1403 is a waveform storage unit, 1404 is a switch unit, 1405 is a 1-clock difference unit, 1406 is a tap coefficient setting unit, 1407 is a sequence counter unit, 1408 is a tap coefficient output terminal, Reference numeral 1409 is a video signal reference signal reproducing unit.

The polarity normalization unit 1401, the addition unit 1402,
The waveform storage unit 1403, the switch unit 1404, the 1-clock difference unit 1405, and the sequence counter unit 1407 have a polarity normalization unit 606, an addition unit 607, a waveform storage unit 608, a switch unit 609, and a 1-clock difference unit 61, respectively.
0, which has the same function as the sequence counter unit 612.

The reference signal reproducing section 140 for the video signal of FIG.
9 performs the same operation as the combination of the video signal crosstalk reproduction unit 619 of the video signal reference signal and the sequence control unit 121 of FIG. 6, and the video signal reference signal reproduction unit 1409.
As the output of the video signal, the reference signal for the video signal is obtained, and the 1-clock difference unit 1405 performs 1-clock difference, and the tap coefficient setting unit 1
At 406, the tap coefficient of the waveform equalization circuit 1202 is set.

According to the embodiment shown in FIG. 14, the control units 123 and 1204 can be configured by a simple processing method, and the addition unit 607 and the waveform storage unit 608, the addition unit 614 and the waveform storage unit 615, Adder 1402 and waveform storage 140
The arithmetic unit configured by 3 has an effect of removing noise included in the signal by increasing the number of calculations. Note that in FIG. 14, the signal path of the output signal of the timing generation circuit 113 is not shown for the sake of simplicity of the drawing. In addition, the 1-clock difference unit 61
0, waveform reproducing section 617, or 1-clock difference section 14
A configuration not using 05 is also conceivable.

Another embodiment of the control unit 1204 shown in FIG. 12 is shown in FIG. The same reference numerals as those in FIGS. 1, 6, 9, and 14 indicate the same functions, and 1501 is a polarity normalization unit, and 150.
2 is a noise removing unit.

Polarity normalizing section 1501 and noise removing section 15
02 has the same function as the polarity normalization unit 907 and the noise removal unit 908, respectively.

The reference signal reproducing section 140 for the video signal of FIG.
9 performs the same operation as the combination of the video signal crosstalk reproducing unit 619 of the video signal reference signal and the sequence control unit 121 of FIG. 9, and the video signal reference signal reproducing unit 1409.
As the output of the video signal, the reference signal for the video signal is obtained, and the 1-clock difference unit 1405 performs 1-clock difference, and the tap coefficient setting unit 1
At 406, the tap coefficient of the waveform equalization circuit 1202 is set.

According to the embodiment shown in FIG. 15, when the period of the 8-field sequence is detected, the sinX / X bar G
Since the difference signal between the CR signal and the pedestal signal is used,
When there is an influence of crosstalk of the quadrature GCR signal or a ghost, the ghost of the horizontal synchronizing signal or the video signal G
Since it is possible to cancel the influence of the ghost of the video signal on the line preceding the CR signal insertion line, as a result, it is possible to stably extract the crosstalk of the video signal reference signal and the multiple signal reference signal. .. Note that in FIG. 15, the signal path of the output signal of the timing generation circuit 113 is not shown for the sake of simplicity of the drawing.
Further, a configuration in which the 1-clock difference unit 610, the waveform reproduction unit 617, or the 1-clock difference unit 1405 is not used is also possible.

Another embodiment of the present invention is shown in FIG. Figure 1
Reference numeral 6 is an image modulated with a video signal to which a sinX / X bar GCR signal is added by an 8-field sequence transmission method by modulating a carrier having an orthogonal relationship with the video carrier with other information (hereinafter referred to as a multiplex signal). It receives and reproduces a transmission signal that is transmitted by being combined with a carrier wave. 1 and 1
1, the same reference numerals as those in FIG. 12 indicate the same functions. The embodiment of FIG. 16 is an application of the embodiment of FIG. 12 to the embodiment of FIG.

In the embodiment of FIG. 16, the video signal output terminal 1
Since the video signal output from 10 and the video signal in the same band as the multiplex signal used for crosstalk removal can be detected independently, there is an effect that each can be demodulated with optimum performance. Further, since the control section of the waveform equalizing circuit of the video signal can identify the period of the 8-field sequence of the video signal and the like to obtain the identification signal, there is an effect that an efficient circuit configuration can be achieved. .. The input of the timing generation circuit 113 may be the video signal of the multiple signal band which is the output of the quadrature synchronous detection circuit 1102.

Another embodiment of the present invention is shown in FIG. Figure 1
Reference numeral 7 is a video image obtained by modulating a carrier wave having an orthogonal relationship with a video carrier wave with another information (hereinafter referred to as a multiplex signal), and a video signal to which a sinX / X bar GCR signal is added by an 8-field sequence transmission method. It receives and reproduces a transmission signal that is transmitted by being combined with a carrier wave. 1 and 1
The same reference numeral as 2 indicates the same function, and 1701 is a two-input waveform equalization circuit.

The embodiment of FIG. 17 is similar to the embodiment of FIG. 1 except that the video signal output from the video signal detection circuit 107 is
Converted into a digital signal through the D conversion circuit 1201,
The 2-input waveform equalization circuit 1701 removes ghosts and corrects waveform distortion due to transmission line characteristics, and removes crosstalk from the multiplexed signal to the video signal.
The output is made through 03. In response to this, the waveform extraction circuit 120 causes the 2-input waveform equalization circuit 17
The sinX / X bar GCR signal and the pedestal signal are extracted from the output of 01, and the sequence control unit 121 of FIG.
It is also used as a control unit 1204 that controls the two-input waveform equalization circuit 1701 in FIG.

In the embodiment shown in FIG. 17, the control section of the two-input waveform equalization circuit for the video signal can identify the period of the 8-field sequence of the video signal and the like to obtain the identification signal, which is efficient. There is an effect that a circuit configuration can be obtained. The input of the timing generation circuit 113 is L
A video signal in the multiple signal band output from the PF 115 may be used.

FIG. 18 shows an embodiment of the controller 1204 shown in FIG. The same reference numerals as those in FIGS. 6 and 14 indicate the same functions. 1801 is a polarity normalization unit, 1802 is an addition unit, 1
Reference numeral 803 is a waveform storage unit, 1804 is a switch unit, and 1805.
Is a waveform reproducing unit, 1806 is a tap coefficient setting unit, 1807.
Is a sequence counter unit, and 1808 is a multiple signal crosstalk reproducing unit for multiple signal reference signals.

The polarity normalization unit 1801, the addition unit 1802,
The waveform storage unit 1803, the switch unit 1804, the waveform reproduction unit 1805, and the sequence counter unit 1807 have a polarity normalization unit 613, an addition unit 614, and a waveform storage unit 6, respectively.
15, the switch unit 616, the waveform reproducing unit 617, and the sequence counter unit 618 have the same functions.

The multiple signal crosstalk reproducing unit 1808 of the multiple signal reference signal of FIG. 18 operates in the same manner as the multiple signal reference signal reproducing unit 620 of FIG. 6, and the multiple signal crosstalk reproducing unit of the multiple signal reference signal. As the output of 1808, the multiplex signal crosstalk of the multiplex signal reference signal is obtained, the waveform is reproduced by the waveform reproducing section 1805, and the tap coefficient setting section 1806 is obtained.
Then, the tap coefficient of the 2-input waveform equalization circuit 1701 is set using the outputs of the 1-clock difference unit 1405 and the waveform reproduction unit 1805.

According to the embodiment shown in FIG. 18, the control units 123 and 1204 can be configured by a simple processing method, and the addition unit 607 and the waveform storage unit 608, the addition unit 614 and the waveform storage unit 615, Adder 1402 and waveform storage 140
3. The calculation unit including the addition unit 1802 and the waveform storage unit 1803 has an effect of removing noise included in the signal by increasing the number of calculations. In addition,
In FIG. 18, the signal path of the output signal of the timing generation circuit 113 is not shown for the sake of simplicity of the drawing. Also, the 1-clock difference unit 610 and the waveform reproduction unit 6
17, a configuration not using the 1-clock difference unit 1405 or the waveform reproducing unit 1805 is also conceivable.

FIG. 19 shows another embodiment of the control unit 1204 shown in FIG. 1, FIG. 6, FIG. 9, FIG. 14, and FIG.
1901 indicates the same function, 1901 is a 4-field delay unit, 1902 is a 2-field delay unit, 1903 is an addition unit, 1904 is a subtraction unit, 1905 is a polarity normalization unit, 1
Reference numeral 906 is a noise removing unit.

A 4-field delay unit 1901, a 2-field delay unit 1902, an addition unit 1903, a subtraction unit 1904,
The polarity normalization unit 1905 and the noise removal unit 1906 have a 4-field delay unit 909, a 2-field delay unit 910, an addition unit 911, a subtraction unit 912, and a polarity normalization unit 9 respectively.
13. It has the same function as the noise removal unit 914.

The multiple signal crosstalk reproducing unit 1808 of the multiple signal reference signal of FIG. 19 operates in the same manner as the multiple signal reference signal reproducing unit 620 of FIG. 9, and the multiple signal crosstalk reproducing unit of the multiple signal reference signal. As the output of 1808, the multiplexed signal crosstalk of the multiplexed signal reference signal is obtained, the noise is removed by the noise removal unit 1906, and then the waveform reproduction unit 1
The waveform is reproduced at 805, and 1 is set at the tap coefficient setting unit 1806.
Using the outputs of the clock difference unit 1405 and the waveform reproduction unit 1805, the tap coefficient of the 2-input waveform equalization circuit 1701 is set.

According to the embodiment shown in FIG. 19, when the period of the 8-field sequence is detected, the sinX / X bar G
Since the difference signal between the CR signal and the pedestal signal is used,
When there is an influence of crosstalk of the quadrature GCR signal or a ghost, the ghost of the horizontal synchronizing signal or the video signal G
Since it is possible to cancel the influence of the ghost of the video signal on the line preceding the CR signal insertion line, as a result, it is possible to stably extract the crosstalk of the video signal reference signal and the multiple signal reference signal. .. Note that FIG. 19 does not show the signal path of the output signal of the timing generation circuit 113 for the sake of simplicity of the drawing.
Also, the 1-clock difference unit 610, the waveform reproduction unit 617,
Clock difference unit 1405 or waveform reproduction unit 1805
A configuration that does not use is also possible.

Another embodiment of the present invention is shown in FIG. Figure 2
0 is a video that is modulated by a video signal to which a sinX / X bar GCR signal is added by an 8-field sequence transmission method by modulating a carrier having an orthogonal relationship with a video carrier with other information (hereinafter referred to as a multiplex signal). It receives and reproduces a transmission signal that is transmitted by being combined with a carrier wave. 1 and 1
1, FIG. 12, and FIG. 17 indicate the same functions. Figure 2
The embodiment of No. 0 is an application of the embodiment of FIG. 17 to the embodiment of FIG.

In the embodiment of FIG. 20, the video signal output terminal 1
Since the video signal output from 10 and the video signal in the same band as the multiplex signal used for crosstalk removal can be detected independently, there is an effect that each can be demodulated with optimum performance. In addition, since the identification signal can be obtained by identifying the period of the 8-field sequence of the video signal from the control unit of the 2-input waveform equalization circuit for the video signal, it is possible to obtain an efficient circuit configuration. There is. The input of the timing generation circuit 113 may be the video signal of the multiple signal band which is the output of the quadrature synchronous detection circuit 1102.

[0121]

According to the present invention, since the multiplexed signal is often multiplexed at a level lower than that of the video signal, the reference signal of the video signal is more resistant to disturbance than the reference signal of the multiplexed signal, and thus is included in the video signal. By detecting the reference signal of the video signal and creating a control signal therefrom, a crosstalk signal by the reference signal of the video signal included in the multiplex signal and the ghost signal by the reference signal of the multiplex signal included in the multiplex signal It is possible to stably extract the reference signal of the multiplex signal and the crosstalk signal included in the video signal by the reference signal of the multiplex signal.

Further, from the above, there is an effect that the crosstalk generated between the reproduced multiplex signal and the video signal or the ghost of the multiplex signal can be surely removed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a transmission signal reproducing device as a first embodiment of the present invention.

FIG. 2 is a block diagram showing a specific example of the two-input waveform equalization circuit shown in FIG.

FIG. 3 is a block diagram showing a specific example of the transversal filter shown in FIG.

FIG. 4 is a waveform diagram showing a specific example of a reference signal of a video signal and a multiplexed signal.

FIG. 5 is a waveform diagram showing a specific example of a reference signal of a multiplexed signal.

6 is a block diagram showing a specific example of a sequence controller and a controller shown in FIG.

7 is a timing chart for explaining the operation of the sequence control unit in FIG.

8 is a block diagram showing a specific example of the waveform reproducing section shown in FIG.

9 is a block diagram showing another specific example of the sequence controller and the controller shown in FIG.

10 is a timing chart for explaining the operation of the sequence control unit in FIG.

FIG. 11 is a block diagram showing a transmission signal reproducing device as a second embodiment of the present invention.

FIG. 12 is a block diagram showing a transmission signal reproducing device as a third embodiment of the present invention.

13 is a block diagram showing a specific example of the waveform equalization circuit shown in FIG.

14 is a block diagram showing a specific example of a control unit shown in FIG.

FIG. 15 is a block diagram showing another specific example of the control unit shown in FIG.

FIG. 16 is a block diagram showing a transmission signal reproducing device as a fourth embodiment of the present invention.

FIG. 17 is a block diagram showing a transmission signal reproducing device as a fifth embodiment of the present invention.

18 is a block diagram showing a specific example of a control unit shown in FIG.

19 is a block diagram showing another specific example of the control unit shown in FIG.

FIG. 20 is a block diagram showing a transmission signal reproducing device as a sixth embodiment of the present invention.

[Explanation of symbols]

106 ... Nyquist filter, 107 ... Video signal detection circuit, 111 ... Band pass filter, 112 ... Quadrature synchronous detection circuit, 113 ... Timing generation circuit, 115 ... Low pass filter, 118 ... Two input waveform equalization circuit, 120 ... Waveform Extraction circuit, 121 ... Sequence control section, 122 ... Waveform extraction section, 123 ... Control section, 604 ... Bar waveform detection section, 605 ... Sequence detection section, 606 ... Polarity normalization section, 607 ... Addition section, 608 ... Waveform storage section , 609 ... Switch part, 610 ... 1-clock difference part, 611 ... Tap coefficient setting part, 612 ... Sequence counter part, 613 ... Polarity normalization part, 614 ... Addition part, 615 ... Waveform storage part, 616 ... Switch part, 617 ... Waveform reproducing section, 618 ... Sequence counter section, 619 ... Video signal reference signal video signal clock Stoke reproduction section, 620 ... Multiplex signal reference signal reproduction section, 901 ... 4 field delay section, 902 ... Subtraction section, 903 ... Polarity determination section, 904 ... Polarity timing section, 905 ... 4 field delay section, 906 ... Subtraction section, 907 ... Polarity normalization section, 908 ... Noise removal section, 909 ... 4 field delay section, 910 ... 2 field delay section, 911 ... Addition section, 912 ... Subtraction section, 913 ... Polarization normalization section, 914 ... Noise removal section, 1101 ... Band pass filter, 1102 ... Quadrature synchronous detection circuit, 1202 ... Waveform equalization circuit, 1204 ... Control section, 1401 ... Polarization normalization section, 1402 ... Addition section, 1403 ... Waveform storage section, 1404 ... Switch section, 1405 ... 1-clock difference unit, 1406 ... Tap coefficient setting unit, 1407 ... Sequence counter unit, 1409 ... Video signal No. reference signal reproduction unit, 1501 ... Polarity normalization unit, 1502 ... Noise removal unit, 1701 ... Two-input waveform equalization circuit, 1801 ... Polarity normalization unit, 1802 ... Addition unit, 1803 ... Waveform storage unit, 1804 ... Switch 1805 ... Waveform reproducing unit, 1806 ... Tap coefficient setting unit, 1807 ... Sequence counter unit, 1808 ... Multiplex signal crosstalk reproducing unit of multiple signal reference signal, 1901 ... 4 field delay unit, 1902 ... 2 field delay unit, 1903 ... Addition unit, 1904 ... Subtraction unit, 1905 ... Polarity normalization unit, 1906 ... Noise removal unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Noda 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Stock company, Hitachi Media Video Media Laboratory (72) Inventor Noritaka Hotta 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi Image Information System Co., Ltd.

Claims (10)

[Claims] 1. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. And a second carrier wave modulated by the second signal are combined to reproduce the first signal and the second signal from the multiplex-transmitted transmission signal. The first signal and the second signal are input, delayed by a delay line with a tap, combined with desired weights, and the second signal is included in the second signal. The two-input waveform equalizing means for removing crosstalk from the first signal to be output, and extracting the signal portion in which the first reference signal is present from the reproduced first signal, First waveform extracting means for outputting, the reproduced second signal, the two input waveforms, etc. A second signal is extracted from the second signal output from the means, and a signal portion in which the crosstalk signal based on the first reference signal is included, which is included in the second signal as the crosstalk, is extracted and output. Control for identifying the type or polarity of the first reference signal from the output of the waveform extracting means and the first waveform extracting means, and extracting the crosstalk signal included in the signal portion from the identification result. Control signal generating means for generating a signal and the signal portion output from the second waveform extracting means are input, and the crosstalk signal is extracted from the signal portion based on the output of the control signal generating means. And a control means for setting the tap coefficient of the two-input waveform equalization means. 2. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. And a second carrier wave modulated by the second signal are combined to reproduce the first signal and the second signal from the multiplex-transmitted transmission signal. The second signal is input, delayed by a delay line with a tap, and then weighted with a desired weight to synthesize the second signal.
Waveform equalizing means for removing the ghost of the second signal contained in the second signal and outputting the signal, and the first reference signal from the reproduced first signal. A first waveform extracting means for extracting and outputting an existing signal portion, and the second signal reproduced from the second signal or the second signal output from the waveform equalizing means. Second waveform extracting means for extracting and outputting a ghost signal by the second reference signal and a signal portion in which the second reference signal exists, which is included as the ghost therein; The type or polarity of the first reference signal is identified from the output of the waveform extracting means, and a control signal for extracting the second reference signal and the ghost signal included in the signal portion is generated from the identification result. Control signal generating means, and the second waveform The signal portion output from the extraction means is input, the second reference signal and the ghost signal are extracted from the signal portion based on the output of the control signal generation means, and the tap of the waveform equalization means is extracted. A transmission signal reproducing apparatus comprising: a control unit that sets a coefficient. 3. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. And a second carrier wave modulated by the second signal are combined to reproduce the first signal and the second signal from the multiplex-transmitted transmission signal. The first signal and the second signal are input, delayed by a delay line with a tap, added with desired weights and combined, and the first signal is included in the first signal. The two-input waveform equalizing means for removing the crosstalk from the second signal to be output, and the signal portion in which the first reference signal is present are extracted from the reproduced first signal. First waveform extracting means for outputting the reproduced first signal, the second input waveform, or the like A second portion for extracting and outputting a signal portion in which a crosstalk signal based on the second reference signal, which is included as the crosstalk in the first signal, is extracted from the first signal output from the means. Control for identifying the type or polarity of the first reference signal from the output of the waveform extracting means and the first waveform extracting means, and extracting the crosstalk signal included in the signal portion from the identification result. Control signal generating means for generating a signal and the signal portion output from the second waveform extracting means are input, and the crosstalk signal is extracted from the signal portion based on the output of the control signal generating means. And a control means for setting the tap coefficient of the two-input waveform equalization means. 4. The transmission signal reproducing apparatus according to claim 1, 2 or 3, wherein the reproduced first signal is input, delayed by a delay line with taps, and then combined with a desired weight. And the first
And a waveform equalization means for removing the ghost of the first signal contained in the first signal and outputting the signal, and the first waveform extraction means outputs the waveform equalization means from the waveform equalization means. From the first signal, a signal portion in which the ghost signal according to the first reference signal and the first reference signal, which are included as the ghost in the first signal, are present,
The control signal generating means identifies the type or polarity of the first reference signal from the output of the first waveform extracting means,
A control signal for extracting the first reference signal and the ghost signal included in the signal portion is generated from the identification result, the identification result is also output, and output from the first waveform extracting unit. Control for inputting the signal portion, extracting the first reference signal and the ghost signal from the signal portion based on the output of the control signal generating means, and setting the tap coefficient of the waveform equalizing means. And a means for reproducing a transmission signal. 5. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by combining a second carrier wave modulated with a second signal, the reproduced first signal By inputting the 1st signal and the 2nd signal to the 2-input waveform equalization, delaying them with a tapped delay line, combining with a desired weight, and outputting the 2nd signal, A method of removing crosstalk from the first signal included in the second signal, comprising extracting a signal portion in which the first reference signal is present from the reproduced first signal. Waveform extraction process and the reproduced second signal or the two-input waveform equalization From said second signal via, it said included as crosstalk in the second signal, the second to extract the existing signal portion of the cross-talk signal by the first reference signal
Waveform extraction step, and the type or polarity of the first reference signal extracted in the first waveform extraction step is identified, and from the identification result,
A control signal generating process for generating a control signal for extracting the crosstalk signal included in the signal part, and a control signal generating process for generating the control signal from the signal part extracted in the second waveform extracting process. The crosstalk signal is extracted based on a control signal,
And a tap coefficient setting step for setting a tap coefficient for input waveform equalization. 6. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by combining a second carrier wave modulated with a second signal, the reproduced first signal The second signal is input to the waveform equalizer, delayed by a delay line with a tap, and then combined with a desired weight, and the second signal is output, so that the second signal is included in the second signal. A method for removing ghosts of the second signal, the first waveform extracting step of extracting a signal portion in which the first reference signal exists from the reproduced first signal; From the second signal or the second signal via the waveform equalization, the second signal A second waveform extracting step of extracting a signal portion in which a ghost signal by the second reference signal and a signal portion in which the second reference signal is present, which signal is included in the signal as the ghost, The type or polarity of the first reference signal extracted in the first waveform extraction step is identified, and from the identification result,
A control signal generating process for generating a control signal for extracting the second reference signal and the ghost signal included in the signal part; and the control from the signal part extracted in the second waveform extracting process. A tap coefficient setting step of extracting the second reference signal and the ghost signal based on a control signal generated in the signal generating step and setting a tap coefficient for the waveform equalization. Transmission signal reproduction method. 7. A first carrier modulated with a first signal having a first reference signal inserted therein and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by combining a second carrier wave modulated with a second signal, the reproduced first signal By inputting the 1st signal and the 2nd signal to the 2-input waveform equalization, delaying them with a tapped delay line, combining them with a desired weight, and outputting the 1st signal, A method of removing crosstalk from the second signal contained in the first signal, comprising extracting a signal portion in which the first reference signal is present from the reproduced first signal. Waveform extraction process, and the reproduced first signal or the two-input waveform equalization From said first signal via, it said included as crosstalk in the first signal, a second extracting an existing signal portion of the crosstalk signal by the second reference signal
Waveform extraction step, and the type or polarity of the first reference signal extracted in the first waveform extraction step is identified, and from the identification result,
A control signal generating process for generating a control signal for extracting the crosstalk signal included in the signal part, and a control signal generating process for generating the control signal from the signal part extracted in the second waveform extracting process. The crosstalk signal is extracted based on a control signal,
And a tap coefficient setting step for setting a tap coefficient for input waveform equalization. 8. The transmission signal reproducing method according to claim 5, 6 or 7, wherein the reproduced first signal is inputted to waveform equalization, and after delaying with a tapped delay line, a desired signal is obtained. In the method of removing the ghost of the first signal contained in the first signal by combining the weighted signals of the first signal and outputting the first signal, the first waveform extracting step comprises: The existence of a ghost signal according to the first reference signal and the first reference signal included as the ghost in the first signal from the first signal output from the waveform equalizing means. The signal part,
Wherein the control signal generating step identifies the type or polarity of the first reference signal from the output of the first waveform extracting means,
A control signal for extracting the first reference signal and the ghost signal included in the signal portion is generated from the identification result, and the identification result is also output, which is extracted in the first waveform extraction process. A tap coefficient setting step of extracting the first reference signal and the ghost signal from the signal portion based on a control signal generated in the control signal generating step and setting a tap coefficient for the waveform equalization. A method for reproducing a transmission signal, which comprises: 9. The transmission signal reproducing device according to claim 1, 2, 3 or 4, wherein the first signal is a video signal and the second signal is a signal different from the video signal. Characterized transmission signal reproducing device. 10. The transmission signal reproducing method according to claim 5, 6, 7 or 8, wherein the first signal is a video signal and the second signal is a signal different from the video signal. Characterized transmission signal reproduction method.