JPH06217169A - Transmission signal reproducing device - Google Patents

Abstract

PURPOSE:To obtain a transmission signal reproducing device equipped with a waveform equalizing means in which the removing time of a stroke can be shortened in an orthogonal modulation system. CONSTITUTION:This device is constituted of a video signal pre-processing means 108 which operates the processing of a GCR signal to a video detection output, orthogonal crosstalk signal pre-processing means 115 which operates the similar processing to an orthogonal detection output, two input waveform equalizing means 117 at the succeeding stage of those pre-processing means, and control means 118 which controls the two input waveform equalizing means. Then, the signal processing is operated at the preceding stage of the two input equalizing means, so that the control of the two input waveform equalizing means can be attained by using the signal as it is each time. Thus, the transmission signal reproducing device in which the crosstalk removing time can be shortened is obtained.

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 effective for receiving a transmission signal which multiplexes another signal with 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, due to imbalance of characteristics of filters on the transmitting side and the receiving side, deviation of detection axis of the receiver, and ghost interference)
It may be simply referred to as a multiplexed signal in the sense of a signal to be multiplexed. ) And the video signal crosstalk occurs. A waveform equalization technique must be used to remove this crosstalk.

As an example of removing this crosstalk, as described in Japanese Patent Laid-Open No. 63-109676, known reference signals are inserted in advance in the video signal and the multiplex signal, respectively, and the receiving side is used. , Two demodulated signals separated and demodulated by synchronous detection with two orthogonal detection phases are passed through two delay lines with taps, and each delayed signal is received using a received reference signal. Combining with given weight 2
Some use a three-dimensional transversal filter.

An example of known reference signals inserted into the video signal and the multiplex signal is, for example, pages 375 to 376 of the Proceedings of the National Conference of the Television Society of 1990 published by the Institute of Television Engineers of Japan.
As discussed in 21-9 "Waveform Equalization of Wide Television System by Quadrature Modulation" on page 21, the 8-field sequence transmitted in the first generation EDTV broadcast for the video signal and sinX / There is a method of transmitting X in the same period.

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, as a reference signal for ghost removal on the broadcasting station side, as shown in FIG. 8 (a), an 8-field sequence GCR (Ghos
t Cancel Reference) signal is shown, and the signal inserted in the preceding line is VIT (V
optical Interval Test) signal, which has a fixed pattern in at least even and odd fields.

An example of a method for detecting and removing a ghost from the GCR signal is also described in the Technical Report of the Television Society of Japan, VOL. 13, NO. 32 (1989
(June 2010), "GCR-Compliant Ghost Cancellers" on pages 31-36. In this paper, in order to detect the distortion of the transmission line from the GCR signal without the distortion of the preceding line being mixed, signals for 8 fields are used, and (S1-S5) + (S6-S2) + (S3-S7) + (S8-S4) ... (Equation 1) is performed to decode the transmission sequence of the GCR signal or to perform a subtraction process by shifting the decoded waveform called differential by one sampling clock ( (Also referred to as one clock difference) to obtain a reference sinX / X pulse shape waveform, and calculate the difference from the sinX / X pulse in the ghost-free state prepared on the receiver side.
Find the error signal due to the ghost. If necessary, the GCR signal, sinX / X pulse, or error signal is noise-removed. Based on this error signal, the tap coefficient of the ghost elimination transversal filter is calculated and updated. This operation is repeated many times, and finally the ghost is removed.

[0008]

The above-mentioned conventional technique has a problem that the time required for ghost removal becomes long due to the processing time of 8 fields and noise removal.

The reason is as follows. When removing the ghost, since the characteristics of the transversal filter are different before and after the update of the tap coefficient, the correlation of the distortion superimposed on the GCR signal disappears. Therefore, if the arithmetic processing as shown in the above (Equation 1) is performed using the signals before and after the tap coefficient update, the ghost which is an error signal will be erroneously detected. Therefore, the decoding operation is performed every time the tap coefficient is updated. However, processing time for 8 fields and noise removal time are required, and as a result, the ghost removal time becomes long.

Similarly, in the crosstalk removal of the quadrature modulation method, the removal time becomes long because the crosstalk is detected and removed by using this GCR signal, or the sequence of the crosstalked signal such as the GCR signal is removed. The problem is that it is difficult to process.

An object of the present invention is to provide a quadrature modulation system in which a carrier having a quadrature relationship with a video carrier is modulated with other information, and is synthesized with a video carrier modulated with a video signal for transmission.
Waveforms that can shorten the crosstalk removal time and the distortion removal time due to the ghost of multiple signals to receive and reproduce those signals in good quality and stably, and improve the certainty of the processing operation of the reference signal sequence processing. It is to provide a transmission signal reproducing device having an equalizing means.

[0012]

The above-mentioned object is transmitted.
Video signal detection means for synchronously detecting signals to obtain video signals
And a field for discriminating the field of the reference signal of the video signal.
Field determination means and signal processing on the reference signal of the video signal
Video reference signal pre-processing means and removes transmission distortion of video signal
Waveform equalizing means and a first control for controlling the waveform equalizing means.
Control means and the transmitted signal are synchronously detected and orthogonal detection is performed.
The quadrature detection means that obtains the force and the image obtained by the quadrature detection output.
A quadrature clock that performs signal processing on the signal in the reference signal period of the image signal.
Band of output of stalk signal pre-processing means and waveform equalization means
A low-pass filter that limits the
2-input waveform equalization means for removing the crosstalk of
And a second control means for controlling the force waveform equalization means.
Can be achieved by

[0013]

In the field discriminating means, the control signal according to the transmission sequence of the reference signal of the video signal and the control signal according to the transmission sequence of the reference signal of the multiplex signal are based on the code signal from the video reference signal preprocessing means. And output.

The video reference signal preprocessing means decodes the transmission sequence of the reference signal from the detected video signal, and performs difference processing and noise removal processing as necessary to preprocess the reference signal. And the sign signal are output.

In the waveform equalizing means, a removal signal for removing transmission distortion such as ghost is generated from the video signal obtained by pre-processing the reference signal by using a transversal filter,
The video signal with transmission distortion removed is output.

The first control means detects an error due to transmission distortion by comparing the output of the waveform equalization means with an internal reference signal prepared in advance without distortion, and a transversal filter of the waveform equalization means. The tap coefficient of is calculated and updated. By repeating this operation, the transmission distortion of the output of the waveform equalizer can be removed.

The quadrature crosstalk signal preprocessing means decodes the transmission sequence of the reference signal of the video signal from the signal obtained at the quadrature detection output, and performs difference processing and noise removal processing as necessary to perform the reference processing. A signal obtained by preprocessing the signal in the signal period is output.

In the two-input waveform equalizing means, a removal signal for removing distortion due to crosstalk is generated from a video signal whose output has been band-limited by a low-pass filter by using a transversal filter, and a reference signal is generated. A multiplex signal in which distortion due to crosstalk is removed from the multiplex signal obtained by preprocessing the period signal is output.

The second control means detects the amount of crosstalk from the output of the two-input waveform equalizing means, calculates the tap coefficient of the transversal filter of the two-input waveform equalizing means, and updates it. By repeating this operation, the distortion due to the crosstalk of the output of the two-input waveform equalizing means can be removed.

By this means, it is possible to always obtain a reference signal that has been subjected to transmission sequence decoding processing, difference processing, or noise removal processing before the waveform equalizer and the two-input waveform equalizer, so that the tap coefficient can be updated. It is not necessary to perform these processes each time, and the time required to remove transmission distortion and distortion due to crosstalk can be shortened.

Further, since the polarity of the reference signal in the current field is always discriminated from the transmission sequence of the reference signal of the video signal, the reliability of the transmission sequence decoding process in the video signal preprocessing means and the orthogonal crosstalk signal preprocessing means is ensured. Can be improved.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

First, FIGS. 7 and 8 show the GC for orthogonal multiplex signals.
An example of the R signal is shown. In orthogonal multiplexing, the television society journal VOL. 42. No. 9 (September 1988), pp. 979 to 986, "On Digital Audio Signal Multiplexing System and Compatibility for Current NTSC Television Broadcasting"
From the viewpoint of compatibility, the interference with the video signal is reduced by modulating the low-frequency signal of the orthogonal multiplex signal using the time-series difference, as shown in FIG. This time-series difference is obtained by subjecting general binary data to delay subtraction processing for one data period.

As a signal having the same spectrum as this signal, a signal obtained by subjecting a sinX / X signal to a delay subtraction process for a time corresponding to one period of data can be considered. The signal waveform is shown in FIG. 7A, and the signal spectrum of the waveform is shown in FIG. 7B.

The signal represented by this waveform is used as a G signal for orthogonal multiplexing.
Assuming a CR signal waveform, consider its transmission sequence. A transmission sequence that does not interfere with the ghost detection of a ghost elimination receiver that uses the GCR signal, and that can also eliminate the influence from the GCR signal, due to the relationship with the 8-field sequence GCR signal implemented in the current Clear Vision broadcasting. Is desirable.

Regarding the GCR signal processing in the ghost detection of the current clear vision broadcasting compatible ghost elimination receiver, see "Clear Vision Handbook", pages 171 to 172, edited by the Clear Vision Promotion Council published in October 1990. As described above, a case where a bar signal is obtained by delaying and subtracting a signal in the GCR signal period by 4 fields and controlling the polarity of the signal is also introduced. Considering this processing, even if the GCR signal for orthogonal multiplexing crosstalks with the GCR signal of the video signal due to a ghost or the like, it is considered that a sequence that can be removed by the 4-field delay subtraction processing is preferable.

On the contrary, when the GCR signal for orthogonal multiplexing is taken in, the G of the video signal is reduced by the ghost or the like.
A sequence that can be removed even if the CR signal crosstalks is considered to be good. At this time, the quadrature multiplex signal band is limited to the range in which the both sidebands of the television signal transmitted by the vestigial sideband amplitude modulation exist, and therefore the color signal band of the NTSC signal is not included.

From the above consideration, the sequence of the GCR signal for orthogonal multiplexing is determined by the television conference magazine VOL. 46.
No. 5 (May 1992) pp. 639 to 644, "Reduction of crosstalk of digital audio signals orthogonally multiplexed on video carrier and reference signal for orthogonal multiplexing" Transmission system completed by 4 fields Thought it was good.

The sequence of this transmission method is shown in FIG.

Further, FIG. 8 (a) shows the 8-field sequence GCR signal implemented in the current clear vision broadcasting by the waveforms of S1 (801) to S8 (808), and FIG. 8 (b) shows orthogonal signals. An example of a GCR signal for multiplexing is P1
It is shown from (809) to P8 (816).

In FIG. 8B, when the waveform having the same polarity as that of FIG. 7 is represented by + and the waveform having the opposite characteristic is represented by −, P1 to P8 are transmitted in 8 fields in the order of + −− +++ −− +. . If this GCR signal is subtracted by a signal delayed by 4 fields, it is deleted, and even if the GCR signal for orthogonal multiplexing crosstalks to the GCR signal of the video signal due to ghosts, etc., the ghost detection of the ghost elimination receiver compatible with the current clear vision broadcasting is detected. Hard to interfere with. Further, when the GCR signal for orthogonal multiplexing is taken out, a signal delayed by two fields is subjected to a subtraction process to obtain a GCR signal for quadrature multiplexing of ++ which has a double amplitude, and a signal delayed by four fields. When the addition processing is performed, a GCR signal for quadrature multiplexing of quadruple amplitude with a quadruple amplitude is obtained. With this processing, even if the GCR signal of the video signal crosstalks, GCR
GC crosstalking from signal field sequence
The R signal can be erased.

All of the following embodiments will be described as examples in which the above-mentioned GCR signal is used.

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

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 a video signal preprocessing circuit, 109 is a field discrimination circuit, 11
0 is a video signal waveform equalization circuit, 111 is a video signal control circuit, 112 is a video signal output terminal, 113 is a bandpass filter, 114 is a quadrature detection circuit, 115 is a quadrature crosstalk signal preprocessing circuit, 116 is a lowpass filter, 11
7 is a 2-input waveform equalization circuit, 118 is a multiple signal control circuit,
Reference numeral 119 is a multiple signal output terminal, and 120 is a timing generation circuit.

Further, the processing subsequent to the video signal detection circuit 107 and the quadrature detection circuit 114 is generally constituted by a digital signal processing circuit, and the following description will also be made on the premise of digital signal processing. However, the A / D conversion circuit and the like are omitted in the figure in order to avoid complication.

A television signal input from the antenna 101 is amplified by a high frequency amplifier circuit 102 and converted by a frequency conversion circuit 103 into an intermediate frequency for demodulation. The selection 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
Amplify and detect at to obtain video signal.

In the detected video signal, the video signal preprocessing circuit 108 decodes the transmission sequence of the GCR signal in accordance with the control signal from the field discrimination circuit 109, and the line before the line in which the GCR signal is inserted is decoded. And the crosstalk from the multi-signal GCR signal are eliminated. At this time, a code signal indicating the polarity of the GCR signal is sent to the field discrimination circuit 109. Furthermore, for the signal obtained by decoding the transmission sequence, for example, difference processing,
After performing noise removal processing and the like, the processed GCR signal is inserted into the video signal and output to the video signal waveform equalization circuit 110.

In the field discriminating circuit 109, a control signal according to the transmission sequence of the reference signal of the video signal is supplied to the video signal preprocessing circuit 108 and the orthogonal crosstalk signal preprocessing based on the code signal from the video signal preprocessing circuit 108. Supply to the circuit 115.

In the video signal waveform equalization circuit 110 and the video signal control circuit 111, first, the tap coefficient of the transversal filter in the video signal waveform equalization circuit 110 is initialized and the like from the video signal preprocessing circuit 108. Of the video signal of
The signal of the R signal period is taken into the video signal control circuit 111. The video signal control circuit 111 detects an error due to transmission distortion by comparing the captured waveform with a GCR signal in a distortion-free state prepared in advance, and detects the tap coefficient of the transversal filter in the video signal waveform equalization circuit 110. Is calculated and updated. After that, the waveform in which the transmission distortion is reduced is taken in by the removal signal generated by the transversal filter, and the same operation is repeated to finally obtain the video signal in which the transmission distortion is removed. The video signal from which the transmission distortion has been removed is output to the video signal output terminal 112 and the low pass filter 116.

On the other hand, a signal in the multiple signal band is extracted from the signal converted to the intermediate frequency by the frequency conversion circuit 103 by the bandpass filter 113 having a symmetrical amplitude characteristic about the video signal carrier, and the quadrature detection circuit 114 performs amplification detection. To obtain multiple signals.

From the detected multiplexed signal, the orthogonal crosstalk signal preprocessing circuit 116 extracts the crosstalk component from the video signal. That is, when there is crosstalk from the video signal, the transmission sequence of the GCR signal of the video signal is decoded according to the control signal from the field discrimination circuit 109, so that the GCR signal of the video signal is generated during the GCR signal. Appears as crosstalk.
After this signal is subjected to, for example, difference processing and noise removal processing, the processed GCR signal is inserted into the multiplexed signal and output to the two-input waveform equalization circuit 117.

In the two-input waveform equalization circuit 117 and the multiple signal control circuit 118, first, the tap coefficient of the transversal filter in the two-input waveform equalization circuit 117 is initialized to perform the orthogonal crosstalk signal preprocessing circuit. 11
The multiplexed signal from 5 is passed as it is, and the signal in the GCR signal period is taken into the multiplexed signal control circuit 118 as a signal before crosstalk removal. In the multiple signal control circuit 118,
The amount of crosstalk is detected from the captured waveform, and the tap coefficient of the transversal filter in the two-input waveform equalization circuit 117 is calculated and updated. Then, the distortion signal due to the crosstalk is reduced by the removal signal generated by the transversal filter using the video signal from the video signal waveform equalization circuit 110 whose band is limited by the low-pass filter 116 having the same pass band as the multiplex signal band. . After that, a waveform in which distortion due to crosstalk is reduced is taken in, and the same operation is repeated to finally obtain a multiplexed signal from which distortion due to crosstalk is removed. The multiplexed signal from which distortion due to crosstalk has been removed is output to the multiplexed signal output terminal 119.

The timing generation circuit 120 outputs timing signals, clocks, etc. required by each circuit from the detected video signal and the detected multiplexed signal.

FIG. 2 shows a block diagram of a configuration example of the video signal preprocessing circuit 108.

In FIG. 2, 201 is a video detection circuit 10.
7 is a video signal input terminal, 202 is a 4-field delay circuit, 203 is a subtractor, 204 is an inverting circuit, 205, 2
08 is a switch, 206 is a difference processing circuit, 207 is a noise removal circuit, 209 is a code signal output terminal to the field discrimination circuit 109, and 210 is a video signal waveform equalization circuit 110.
To a video signal output terminal, reference numeral 211 denotes a video signal control circuit 11
Reference numeral 1 is a control signal input terminal, and 212 is a control signal input terminal from the field discrimination circuit 109.

The video signal input from the video detection circuit 107 via the video signal input terminal 201 is distributed to the 4-field delay circuit 202, the subtractor 203 and the switch 208.

The subtractor 203 subtracts the signal which is delayed by the 4-field delay circuit 202 and which is four fields before and the current signal. At this time, the sign signal of the subtracted GCR signal is output to the field discrimination circuit 109 via the sign signal output terminal 209.

The switch 205 is the field discrimination circuit 1
In accordance with the control signal input from the control signal input terminal 212 from 09, for example, the output of the subtractor 203 is selected in the field in which the polarity of the GCR signal is positive, and the signal inverted by the inversion circuit 204 in the negative field is selected. This makes it possible to always obtain GCR signals having the same polarity for each field.

The difference processing circuit 206 performs so-called 2-clock difference processing, for example, subtracting the signal input from the switch 205 and the signal delayed by two sample clocks,
A differential waveform (sinX / X) is obtained as a GCR signal.

The noise removing circuit 207 performs, for example, generally well-known field recursive noise removal on the signal from the difference processing circuit 206, and outputs it to the switch 208.

The switch 208 is for the video signal control circuit 11
1 according to the control signal input from the control signal input terminal 211 from the noise removal circuit 2 during the GCR signal period.
The video signal from the video signal input terminal 201 is selected during the other video period. As a result, a video signal pre-processed only in the GCR signal period necessary for the waveform equalization processing in the subsequent stage is obtained and output to the video signal waveform equalization circuit 110 via the video signal output terminal 210.

FIG. 3 shows a block diagram of a configuration example of the orthogonal crosstalk signal preprocessing circuit 115.

In FIG. 3, 301 is a quadrature detection circuit 11.
Multiplexed signal input terminal from 4, 302 is a 4-field delay circuit, 303 is a subtractor, 304 is an inverting circuit, 305, 3
Reference numeral 08 is a switch, 306 is a difference processing circuit, 307 is a noise removing circuit, 309 is a multiple signal output terminal to the two-input waveform equalizing circuit 117, 310 is a control signal input terminal from the multiple signal control circuit 118, and 311 is a field discrimination. Circuit 10
9 is a control signal input terminal.

The multiplexed signal input from the quadrature detection circuit 114 via the multiplexed signal input terminal 301 is distributed to the 4-field delay circuit 302, the subtractor 303 and the switch 308.

After that, the same processing as that of the video signal preprocessing circuit 108 shown in FIG. 2 is performed to insert the GCR signal of the video signal appearing due to the crosstalk into the multiplex signal, and the 2 signal is output via the multiplex signal output terminal 309. Input waveform equalization circuit 117
Output to. This makes it possible to obtain a multiplexed signal that has been preprocessed only during the GCR signal period necessary for the post-stage crosstalk removal processing.

As described above, as shown in FIGS. 2 and 3, the video signal preprocessing circuit 108 and the quadrature crosstalk signal preprocessing circuit 115 perform the difference processing, the noise removal processing, etc., and the polarities are always matched in each field. Since it is possible to obtain a video signal and a multiplexed signal with the inserted GCR signal, in the waveform equalization processing and crosstalk removal processing in the subsequent stage, code processing, difference processing, and noise removal are performed in the above sequence each time the tap coefficient is updated. There is no need to perform processing.

In addition, since the noise reduction circuits 207 and 307 in FIGS. 2 and 3 can set the noise improvement degree independently, the waveform equalization processing and the crosstalk removal processing in the subsequent stage are performed in a time division manner. In some cases, it is possible to increase the degree of noise improvement of the noise removal circuit (longer time constant) in the pre-processing circuit necessary for later processing.

FIG. 4 shows a block diagram of a configuration example of the field discrimination circuit 109.

In FIG. 4, 401 is a code signal input terminal from the video signal preprocessing circuit 108, 402 is a field clock input terminal from the timing generation circuit 120, and 4 is a field clock input terminal.
03 is a polarity detection circuit, 404, 405, 406, 407
Is a register, 408 and 409 are AND circuits, and 410 is O
R circuits 411 are control signal output terminals to the video signal preprocessing circuit 108 and the orthogonal crosstalk signal preprocessing circuit 115.

In the polarity detection circuit 403, the polarity of the GCR signal is, for example, if the number of positive codes is larger than a preset number with respect to the code signal input from the video signal preprocessing circuit 108 via the code signal input terminal 401. Is determined to be a positive (bar waveform) field, and if less is determined to be a negative (pedestal waveform) field. And
A signal encoded as 1 is output in the positive field, and a signal encoded as 0 is output in the negative field.

Registers 404, 405, 406, 407
Holds the output of the polarity detection circuit 403 by sequentially delaying it in units of one field. That is, one field before the current field from register 404, register 4
Two fields before from 05, three fields before from register 406, and four fields before from register 407.
It outputs the polarity of each CR signal.

Now, for example, in the field of FIG. 8A, the polarity of the GCR signal is positive, that is, S1, S3, S.
Consider the case of S6 and S8. As can be seen from FIG. 8, if the current field is S1, the registers 404, 40
Signals of 1, 0, 1, and 0 are output from 5, 406, and 407, respectively. Further, when the current field is S3, 0, 1, 1, 0 is 0. When the current field is S6, 0, 0, 1, 0 is 0, and the current field is S8.
In the case of, 0, 1, 0, 0 is output. Therefore, the polarity of the GCR signal in the current field can be determined by decoding the combination of the four outputs. If the logic synthesis of the above combination is simplified, AND circuits 408, 4
09, OR circuit 410 and other combinations. That is, the output of the register 404 is 0, and the register 405
Output is 1, the output of the register 407 is 0, the output of the register 405 is 0, and the register 406
Is 1 and the output of the register 407 is 0, the polarity of the GCR signal in the current field is determined to be positive and 1 is output. This signal is a control signal output terminal 41.
1 to the video signal preprocessing circuit 108 and the orthogonal crosstalk signal preprocessing circuit 115.

In this way, by always discriminating the polarity in the current field from the GCR signal of the video signal, stable transmission sequence decoding processing can be performed.

FIG. 5 is a block diagram showing one structural example of the video signal waveform equalization circuit 110.

In FIG. 5, 501 is a video signal input terminal from the video signal preprocessing circuit 108, 502 is a control signal input terminal from the video signal control circuit 111, and 503 and 50.
4, 505, 516, 517, 518 are delay circuits, 50
6, 507, 508, 509, 519, 520, 52
1, 522 are multipliers, 510, 511, 512, 51
3, 514, 515, 523, 524, 525, 526
Is an adder and 527 is a video signal output terminal.

This configuration is a generally well-known waveform equalization circuit configuration, and is a cascade connection of a non-recursive filter and a recursive filter using a transversal filter. The non-recursive filter in the front stage removes the transmission distortion due to the ghost and the ghost with a short delay time, and the recursive filter in the subsequent stage removes the transmission distortion due to the ghost with a long delay time.

A signal for distortion removal is generated by applying a coefficient to the video signal input from the input terminal 501 via the control signal input terminal 502 to the multiplier of the tap corresponding to the delay time of each distortion. Signal is added to remove the distortion, and output from the output terminal 527.

FIG. 6 shows a block diagram of a configuration example of the two-input waveform equalization circuit 117.

In FIG. 6, 601 is a video signal input terminal from the low pass filter 116, 602 is a control signal input terminal from the multiplex signal control circuit 118, 603 is a multiplex signal input terminal from the orthogonal crosstalk signal preprocessing circuit 115, Reference numerals 604, 605, 606 and 607 denote delay circuits, 60
8, 609, 610, 611, 612 are multipliers, 61
3, 614, 615, 616, 617 and 618 are adders, and 619 is a multiple signal output terminal.

This is also a configuration using a general transversal filter. A signal for removing distortion is generated from the video signal input through the video signal input terminal 601 by giving a coefficient to the multiplier of the tap corresponding to the delay time of each distortion due to crosstalk through the control signal input terminal 602. Then, the distortion is removed by adding it to the multiplex signal input through the multiplex signal input terminal 603, and output from the multiplex signal output terminal 619.

As described above, according to this embodiment, the video signal control circuit 111 and the multiple signal control circuit 118 have already been subjected to the sequence decoding process, the difference process, and the noise removing process.
Since it is possible to constantly supply the video signal and the multiplexed signal in which the GCR signals having the same polarity are inserted for each field, it is necessary to perform the code processing, the difference processing, the noise removal processing, etc. in the above sequence every time the tap coefficient is updated. Therefore, it is possible to reduce the time required for the transmission distortion removal processing and the crosstalk removal processing.

In addition, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, since the noise improvement degrees of the noise removal circuits in the video signal preprocessing circuit 108 and the orthogonal crosstalk signal preprocessing circuit 115 can be set independently, the waveform equalization processing and the crosstalk removal in the subsequent stage can be performed. When the processing is performed in a time-division manner, there is an effect that the noise reduction degree of the noise removal circuit in the preprocessing circuit necessary for the processing performed later in time can be increased (the time constant can be lengthened).

FIG. 9 shows a block diagram of a transmission signal reproducing apparatus as a second embodiment of the present invention.

In FIG. 9, 901 is a field discrimination circuit, 902 is a quadrature signal preprocessing circuit, 903 is a switch,
Reference numeral 902 is a multiple signal waveform equalizing circuit, and 905 is a multiple signal control circuit. In addition, those having the same reference numerals as those in FIG. 1 have the same functions.

The present embodiment differs from the first embodiment in that a waveform equalizing circuit is also provided in the multiple signal system to obtain a multiple signal of higher quality.

In the field discriminating circuit 901, the control signal corresponding to the transmission sequence of the reference signal of the video signal is supplied to the video signal preprocessing circuit 108 and the orthogonal crosstalk signal preprocessing based on the code signal from the video signal preprocessing circuit 108. The control signal corresponding to the transmission sequence of the reference signal of the multiplex signal is supplied to the circuit 115 to the orthogonal signal preprocessing circuit 902.

The waveform equalization processing of the video signal is performed by the same method as in FIG.

On the other hand, the detected multiplexed signal is decoded in the quadrature signal preprocessing circuit 902 in accordance with the control signal from the field discrimination circuit 901 to decode the transmission sequence of the GCR signal of the multiplexed signal, and the line in which the GCR signal is inserted. From the front line and crosstalk from the GCR signal of the video signal are eliminated. Furthermore, after performing noise removal processing, etc., on the signal obtained by decoding the transmission sequence, the processed GCR signal is inserted into the multiplexed signal and output to the switch 903.

The switch 903 is a multiple signal control circuit 90.
The output of the quadrature signal pre-processing circuit 902 and the output of the quadrature crosstalk signal pre-processing circuit 115 are switched according to the control signal from the signal No. 5 and output to the two-input waveform equalization circuit 117.

In the 2-input waveform equalization circuit 117 and the multiplex signal control circuit 905, first, the switch 903 is controlled to select the output from the orthogonal crosstalk signal preprocessing circuit 115, and the inside of the 2-input waveform equalization circuit 117 is selected. Of the transversal filter is initialized, and the multiplexed signal from the orthogonal crosstalk signal preprocessing circuit 115 is allowed to pass through as it is.
The signal in the R signal period is fetched into the multiple signal control circuit 905. The multiple signal control circuit 905 detects the crosstalk amount from the captured waveform, calculates and updates the tap coefficient of the transversal filter in the two-input waveform equalization circuit 117. Then, the distortion signal due to the crosstalk is reduced by the removal signal generated by the transversal filter using the video signal from the video signal waveform equalization circuit 110 whose band is limited by the low-pass filter 116 having the same pass band as the multiplex signal band. . After that, a waveform in which distortion due to crosstalk is reduced is taken in, and the same operation is repeated to finally obtain a multiplexed signal from which distortion due to crosstalk is removed. The multiplexed signal from which distortion due to crosstalk has been removed is output to the multiplexed signal waveform equalization circuit 904.

In the multiple signal waveform equalization circuit 905,
Similar to the case of the video signal waveform equalization circuit 110, first, a signal in the GCR signal period as a signal before equalization is taken into the multiplex signal control circuit 905, and the taken-in waveform and the GCR signal in a distortion-free state prepared in advance. The error due to the transmission distortion is detected by comparing and the tap coefficient of the transversal filter is calculated and updated. After that, the waveform in which the transmission distortion is reduced is taken in by the removal signal generated by the transversal filter, and the same operation is repeated to finally obtain the signal in which the transmission distortion is removed.
The signal from which the transmission distortion has been removed is output to the multiplexed signal output terminal 119.

FIG. 10 is a block diagram showing a configuration example of the quadrature signal preprocessing circuit 902.

In FIG. 10, 1001 is a multiple signal input terminal from the quadrature video detection circuit 114, 1002 is a 2-field delay circuit, 1003 is a subtractor, 1004 is a 4-field delay circuit, 1005 is an adder, 1006 is an inverting circuit, Reference numerals 1007 and 1009 denote switches, 1008 a noise removal circuit, 1010 a multiple signal output terminal to the switch 903, 1011 a control signal input terminal from the multiple signal control circuit 905, and 1012 a control signal input terminal from the field determination circuit 901. is there.

The multiplexed signal input from the quadrature detection circuit 114 via the multiplexed signal input terminal 1001 is distributed to the 2-field delay circuit 1002, the subtractor 1003, and the switch 1009.

The subtracter 1003 subtracts the signal two fields before, which is delayed by the two-field delay circuit 1002, from the current signal.

The adder 1005 outputs the output of the subtractor 1003 and the output of the subtractor 1003 to the 4-field delay circuit 10.
The signal further delayed by 04 is added.

The switch 1007, in response to a control signal input from the field discrimination circuit 901 via the control signal input terminal 1012, outputs the output of the subtractor 1005 to a negative value in a field in which the polarity of the GCR signal of the multiplexed signal is positive, for example. In the field, the signal inverted by the inversion circuit 1006 is selected. This makes it possible to always obtain GCR signals having the same polarity for each field.

In the noise removing circuit 1008, the switch 1
The signal from 007 is subjected to, for example, generally well-known field recursive noise removal, and output to the switch 1009.

The switch 1009 is a multiple signal control circuit 9
In accordance with the control signal input from the control signal input terminal 051 through the control signal input terminal 1011, the output from the noise removing circuit 1008 is output during the GCR signal period of the multiplex signal, and the multiplex signal from the multiplex signal input terminal 1001 is output during the other signal periods. select. As a result, a pre-processed multiplexed signal is obtained only in the GCR signal period necessary for the waveform equalization process in the subsequent stage, and is output to the switch 903 via the multiplexed signal output terminal 1010.

As described above, the video signal preprocessing circuit 108, the quadrature signal preprocessing circuit 902, and the quadrature crosstalk signal preprocessing circuit 115 perform difference processing, noise removal processing, and the like, and the GCR whose polarities are always the same in each field.
Since it is possible to obtain a video signal and a multiplexed signal in which signals are inserted, in the waveform equalization processing and crosstalk removal processing in the subsequent stage, code processing, difference processing, noise removal processing, etc. are performed in the above sequence each time the tap coefficient is updated. You don't have to.

Further, the noise removing circuits 207, 307, 100 in the video signal preprocessing circuit 108, the orthogonal signal preprocessing circuit 902, and the orthogonal crosstalk signal preprocessing circuit 115.
8, the noise improvement degree can be set independently of each other. Therefore, in the case where the waveform equalization process and the crosstalk removal process in the subsequent stage are performed in a time-division manner, it is necessary to perform the process before the process performed later in time. It is also possible to increase the noise improvement degree of the noise removal circuit in the processing circuit (longer the time constant).

FIG. 11 is a block diagram showing one structural example of the field discrimination circuit 901.

In FIG. 11, 1101 is a code signal input terminal from the video signal pre-processing circuit 108, 1102 is a field clock input terminal from the timing generation circuit 120, 1103 is a polarity detection circuit, 1104, 1105, 1
106, 1107 are registers, 1108, 1109, 1
111 and 1112 are AND circuits, 1110 and 1113 are OR circuits, 1114 is an output terminal to the orthogonal signal preprocessing circuit 902, and 1115 is a control signal output terminal to the video signal preprocessing circuit 108 and the orthogonal crosstalk signal preprocessing circuit 115. Is.

In the field discriminating circuit 109 shown in FIG. 4, in addition to the control signal for transmission sequence decoding of the GCR signal of the video signal, a circuit for generating the control signal for sequence decoding of the GCR signal of the multiplexed signal is added. It is a thing.

Now, for example, in the field where the polarity of the GCR signal of the multiplexed signal in FIG. 8B is positive, that is, P1,
Consider the case of P4, P5, and P8. Similar to the field discrimination circuit 109 shown in FIG. 4, the current field is P1.
If (video signal is S1), registers 1104, 1
From 105, 1106, 1107, 1, 0,
Signals of 1 and 0 are output. If the current field is P4 (video signal is S4), 1, 0, 1, 1
However, when the current field is P5 (video signal is S5), 0, 1, 0, 1 is 0, and when the current field is P8 (video signal is S8), 0, 1, 0, 0 Is output. Therefore, the polarity of the GCR signal of the multiplex signal of the current field can be determined by decoding the combination of these four outputs. If the logic synthesis of the above combinations is simplified, AND circuits 1111 and 1112 and an OR circuit 1113 are used.
The combination is as follows. That is, the output of the register 1104 is 1, the output of the register 1105 is 0, and
The output of the register 1106 is 1, and the register 110
When the output of 4 is 0, the output of the register 1105 is 1 and the output of the register 1106 is 0, it is determined that the polarity of the GCR signal of the multiplexed signal of the current field is positive and 1 is output. This signal is a control signal output terminal 111.
4 to the multiplex signal preprocessing circuit 902.

In this way, the registers 1104 and 110
5, 1106 and 1107 are shared, and G of the video signal is always
By determining the polarities of the video signal and the multiplexed signal in the current field from the CR signal, stable transmission sequence decoding processing can be performed.

The multiple signal waveform equalization circuit 904 can be realized by a configuration similar to that shown in FIG.

The resultant signal is added to the multiplexed signal to remove the distortion, and output from the multiplexed signal output terminal 619. Also according to the present embodiment, the video signal control circuit 111 and the multiple signal control circuit 905 have already been subjected to the sequence decoding process, the difference process, and the noise removing process, and the GCR signal having the same polarity is inserted for each field. Since multiple signals can be constantly supplied, it is not necessary to perform code processing, difference processing, noise removal processing, etc. in the above sequence each time the tap coefficient is updated, and the time required for transmission distortion removal processing and crosstalk removal processing There is an effect that can shorten.

In addition, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, since the noise improvement degrees of the noise removal circuits in the video signal preprocessing circuit 108, the quadrature signal preprocessing circuit 902, and the quadrature crosstalk signal preprocessing circuit 115 can be set independently of each other, the waveforms in the subsequent stage can be set. When performing equalization processing and crosstalk removal processing in a time-sharing manner, increase the noise improvement degree (longer time constant) of the noise removal circuit in the preprocessing circuit, which is necessary for processing that is performed later in time. There is an effect that can be.

Furthermore, according to this embodiment, there is an effect that a higher quality multiplexed signal can be obtained.

FIG. 12 shows a block diagram of a transmission signal reproducing apparatus as a third embodiment of the present invention.

In FIG. 12, reference numeral 1201 denotes a timing generation circuit, which outputs a timing signal, a clock and the like required in each circuit from the detected video signal and the detected multiplexed signal. In addition, the same reference numerals as those in FIGS. 1 and 9 have the same functions.

This embodiment is different from the second embodiment in that the waveform equalizing circuit of the video signal is deleted and the circuit scale is increased when the reception environment is good enough that the transmission distortion of the video signal does not affect much. It is intended to reduce.

Also in this embodiment, the multiple signal control circuit 9 is used.
05 has already been sequence-decoded, difference-processed, and noise-removed processed.
Since the multiplex signal with the CR signal inserted can always be supplied, it is not necessary to perform code processing, difference processing, noise removal processing, etc. in the above sequence every time the tap coefficient is updated, and transmission distortion removal processing and crosstalk processing can be performed. This has the effect of reducing the time required for the removal process.

Further, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, since the noise improvement degree of the noise elimination circuit in the video signal preprocessing circuit 108, the quadrature signal preprocessing circuit 902, and the quadrature crosstalk signal preprocessing circuit 115 can be set independently of each other, the waveform of the subsequent stage can be set. When performing equalization processing and crosstalk removal processing in a time-sharing manner, increase the noise improvement degree (longer time constant) of the noise removal circuit in the preprocessing circuit, which is necessary for processing that is performed later in time. There is an effect that can be.

Furthermore, according to this embodiment, there is an effect that a good quality multiplexed signal can be obtained with a small circuit scale.

FIG. 13 shows a block diagram of a transmission signal reproducing apparatus as a fourth embodiment of the present invention.

In FIG. 13, 1301 is a Nyquist filter, 1302 is an in-phase detection circuit, 1303 is an in-phase signal preprocessing circuit, 1304 is a field discrimination circuit, 1305.
Is an in-phase signal waveform equalization circuit, and 1306 is an in-phase signal control circuit. In addition, those having the same reference numerals as those in FIG. 1 have the same functions.

This embodiment is different from the first embodiment in that the video signal system does not have a waveform equalizing circuit, that is, a circuit for reproducing a quadrature signal is added to an ordinary television receiver or the like.

A signal in the multiple signal band is extracted from the signal converted to the intermediate frequency by the frequency conversion circuit 103 by the bandpass filter 113 having the amplitude characteristic symmetrical with respect to the video signal carrier, and the in-phase detection is performed via the Nyquist filter 1301. A video signal in the same band as the multiplex signal is obtained by amplification and detection in the circuit 1302.

In the in-phase signal preprocessing circuit 1303, the GCR signal transmission sequence of the video signal is decoded according to the control signal from the field discrimination circuit 1304 in the same manner as the video signal preprocessing circuit 108 described above, and the GCR signal is inserted. From the previous line and the G of multiple signals
Eliminate crosstalk from CR signals. At this time, GC
The code signal indicating the polarity of the R signal is used as the field discrimination circuit 13
To 04. Further, the decoded signal of the transmission sequence is subjected to, for example, difference processing and noise removal processing, and then the processed GCR signal is inserted into the video signal and output to the waveform equalization circuit 1305.

In the field discriminating circuit 1304, similarly to the field discriminating circuit 109 described above, a control signal corresponding to the transmission sequence of the reference signal of the video signal is supplied to the in-phase signal based on the code signal from the in-phase signal preprocessing circuit 1303. Preprocessing circuit 1303 and orthogonal crosstalk signal preprocessing circuit 11
Output to 5.

In the in-phase signal waveform equalization circuit 1305 and the in-phase signal control circuit 1306, as in the case of the video signal waveform equalization circuit 110 and the video signal control circuit 111, first, the GCR signal is used as a signal before equalization. The period signal is taken into the in-phase signal control circuit 1306, an error due to transmission distortion is detected by comparing the taken-in waveform with a GCR signal in a distortion-free state prepared in advance, and the tap coefficient of the transversal filter is calculated. Update.
After that, the waveform in which the transmission distortion is reduced is taken in by the removal signal generated by the transversal filter, and the same operation is repeated to finally obtain the signal in which the transmission distortion is removed. The signal from which the transmission distortion has been removed is output to the 2-input waveform equalization circuit 117.

The 2-input waveform equalization circuit 117 removes the distortion due to crosstalk by the removal signal generated by the transversal filter using the video signal from the in-phase signal waveform equalization circuit 1305.

The in-phase signal preprocessing circuit 1303, the field discriminating circuit 1304, and the in-phase signal waveform equalizing circuit 1305 can be realized by the same configurations as those shown in FIGS. 2, 4 and 5, respectively.

Further, since the circuit of the in-phase signal system has only to handle the video signal in the same band as the multiplex signal, it is possible to set the system clock frequency to a low value, and the number of taps of the transversal filter can be greatly reduced. May be reduced to

Also in this embodiment, the common mode signal control circuit 1 is used.
306 and the multiple signal control circuit 905 have already been subjected to sequence decoding processing, difference processing, noise removal processing,
Since it is possible to constantly supply the video signal and the multiplexed signal in which the GCR signals having the same polarity are inserted for each field, it is necessary to perform the code processing, the difference processing, the noise removal processing, etc. in the above sequence every time the tap coefficient is updated. Therefore, there is an effect that the time required for the transmission distortion removal processing and the crosstalk removal processing can be shortened.

In addition, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, since the noise improvement degree of the noise elimination circuit in the in-phase signal preprocessing circuit 1303 and the quadrature crosstalk signal preprocessing circuit 115 can be set independently, the waveform equalization processing and the crosstalk in the subsequent stage can be performed. When the removal processing is performed in a time-division manner, there is an effect that the noise improvement degree of the noise removal circuit in the preprocessing circuit necessary for the processing performed later in time can be increased (the time constant can be lengthened). .

Further, according to this embodiment, there is an effect that the orthogonal signal reproducing function can be easily added to the existing television receiver or the like.

FIG. 14 shows a block diagram of a transmission signal reproducing apparatus as a fifth embodiment of the present invention.

In FIG. 14, reference numeral 1401 denotes a field discriminating circuit which, in the same manner as the field discriminating circuit 901, responds to the transmission sequence of the reference signal of the video signal based on the code signal from the in-phase signal preprocessing circuit 1303. To the in-phase signal preprocessing circuit 1303 and the quadrature crosstalk signal preprocessing circuit 115, and the quadrature signal preprocessing circuit 9 outputs a control signal corresponding to the transmission sequence of the reference signal of the multiplexed signal.
Supply to 02. In addition, the same reference numerals as those in FIGS. 1, 9 and 13 have the same functions.

The field discriminating circuit 1401 can be realized by the same structure as that shown in FIG.

Further, since the circuit of the in-phase signal system has only to handle the video signal in the same band as the multiplex signal, it is possible to set the system clock frequency to a low value, and the number of taps of the transversal filter can be greatly reduced. May be reduced to

This embodiment is different from the fourth embodiment in that a waveform equalizing circuit is also provided in the multiple signal system to obtain higher quality multiple signals.

Also in this embodiment, the in-phase signal control circuit 1 is used.
306 and the multiple signal control circuit 905 have already been subjected to sequence decoding processing, difference processing, noise removal processing,
Since it is possible to constantly supply the video signal and the multiplexed signal in which the GCR signals having the same polarity are inserted for each field, it is necessary to perform the code processing, the difference processing, the noise removal processing, etc. in the above sequence every time the tap coefficient is updated. Therefore, there is an effect that the time required for the transmission distortion removal processing and the crosstalk removal processing can be shortened.

Further, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, since the noise improvement degrees of the noise elimination circuits in the in-phase signal preprocessing circuit 1303, the quadrature signal preprocessing circuit 902, and the quadrature crosstalk signal preprocessing circuit 115 can be set independently of each other, the latter stage Waveform equalization,
When performing crosstalk removal processing in a time-sharing manner,
There is an effect that the degree of noise improvement of the noise removal circuit in the preprocessing circuit necessary for the processing performed later in time can be increased (the time constant can be lengthened).

Furthermore, according to this embodiment, the orthogonal signal reproducing function can be easily added to the existing television receiver and the like, and there is an effect that a higher quality multiplexed signal can be obtained.

FIG. 15 shows a block diagram of a transmission signal reproducing apparatus as a sixth embodiment of the present invention.

In FIG. 15, the same reference numerals as those in FIGS. 1, 9, 10, 13, and 14 have the same functions.

Further, since the circuit of the in-phase signal system has only to handle the video signal in the same band as the multiplex signal, it is possible to set the system clock frequency to a low value, and the number of taps of the transversal filter can be greatly reduced. May be reduced to

The present embodiment is different from the fifth embodiment in that the waveform equalization circuit for the in-phase signal is deleted when the reception environment is good such that the transmission distortion of the in-phase signal is not so much affected. It is intended to reduce the scale.

Also in this embodiment, the multiple signal control circuit 9
05 has already been sequence-decoded, difference-processed, and noise-removed processed.
Since the multiplex signal with the CR signal inserted can always be supplied, it is not necessary to perform code processing, difference processing, noise removal processing, etc. in the above sequence every time the tap coefficient is updated, and transmission distortion removal processing and crosstalk processing can be performed. This has the effect of reducing the time required for the removal process.

In addition, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Furthermore, since the noise improvement degrees of the noise elimination circuits in the in-phase signal preprocessing circuit 1303, the quadrature signal preprocessing circuit 902, and the quadrature crosstalk signal preprocessing circuit 115 can be set independently, the latter stage Waveform equalization,
When performing crosstalk removal processing in a time-sharing manner,
There is an effect that the degree of noise improvement of the noise removal circuit in the preprocessing circuit necessary for the processing performed later in time can be increased (the time constant can be lengthened).

Furthermore, according to the present embodiment, the quadrature signal reproducing function can be easily added to the existing television receiver and the like, and it is possible to obtain a good multiplexed signal with a small circuit scale. is there.

FIG. 16 shows a block diagram of a transmission signal reproducing apparatus as a seventh embodiment of the present invention.

In FIG. 16, reference numeral 1601 denotes a timing generation circuit, which outputs a timing signal, a clock and the like required in each circuit from the detected video signal and the detected multiplexed signal. In addition, the same reference numerals as those in FIGS. 1 and 13 have the same functions.

Further, since the circuit of the in-phase signal system has only to handle the video signal in the same band as the multiplex signal, it is possible to set the system clock frequency to a low value, and the number of taps of the transversal filter can be greatly reduced. May be reduced to

This embodiment is different from the fourth embodiment in that a circuit for quadrature signal reproduction is added to a television receiver or the like which already has a waveform equalizing circuit in the video signal system, that is, a ghost canceller. It is a thing.

Also in this embodiment, the video signal control circuit 1
11, common-mode signal control circuit 1306, multiplex signal control circuit 1
The sequence decoding process, the difference process, and the noise removal process have already been performed on 18 and G having the same polarity for each field.
Since the video signal and the multiplexed signal in which the CR signal is inserted can be constantly supplied, it is not necessary to perform code processing, difference processing, noise removal processing, etc. in the above sequence every time the tap coefficient is updated, and transmission distortion removal processing is performed. Thus, there is an effect that the time required for the crosstalk removal processing can be shortened.

Also, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, since the noise improvement degrees of the noise removal circuits in the video signal preprocessing circuit 108, the in-phase signal preprocessing circuit 1303, and the quadrature crosstalk signal preprocessing circuit 115 can be set independently of each other, the latter stage Waveform equalization,
When performing crosstalk removal processing in a time-sharing manner,
There is an effect that the degree of noise improvement of the noise removal circuit in the preprocessing circuit necessary for the processing performed later in time can be increased (the time constant can be lengthened).

Furthermore, according to this embodiment, there is an effect that the orthogonal signal reproducing function can be easily added to the existing television receiver having a built-in ghost canceller.

FIG. 17 shows a block diagram of a transmission signal reproducing apparatus as an eighth embodiment of the present invention.

In FIG. 17, those having the same reference numerals as those in FIGS. 1, 9, 13, 14, and 16 have the same functions.

Further, since the circuit of the in-phase signal system only needs to handle the video signal in the same band as the multiplex signal, it is possible to set the system clock frequency to a low value, and the number of taps of the transversal filter can be greatly reduced. May be reduced to

This embodiment is different from the seventh embodiment in that a waveform equalizing circuit is also provided in the multiple signal system to obtain a higher quality multiple signal.

Also in this embodiment, the video signal control circuit 1
11, in-phase signal control circuit 1306, multiplex signal control circuit 9
05 has already been sequence-decoded, difference-processed, and noise-removed processed.
Since the video signal and the multiplexed signal in which the CR signal is inserted can be constantly supplied, it is not necessary to perform code processing, difference processing, noise removal processing, etc. in the above sequence every time the tap coefficient is updated, and transmission distortion removal processing is performed. Thus, there is an effect that the time required for the crosstalk removal processing can be shortened.

In addition, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, the video signal preprocessing circuit 108, the in-phase signal preprocessing circuit 1303, the quadrature signal preprocessing circuit 902,
Since the degree of noise improvement of the noise removal circuit in the orthogonal crosstalk signal preprocessing circuit 115 can be set independently of each other, when the waveform equalization processing in the subsequent stage and the crosstalk removal processing are performed in time division, the time There is an effect that the degree of noise improvement of the noise removal circuit in the pre-processing circuit necessary for subsequent processing can be increased (the time constant is increased).

Furthermore, according to this embodiment, the orthogonal signal reproducing function can be easily added to the existing television receiver having a built-in ghost canceller, and a higher quality multiplexed signal can be obtained. There is.

FIG. 18 shows a block diagram of a transmission signal reproducing apparatus as a ninth embodiment of the present invention.

In FIG. 18, the same reference numerals as those in FIGS. 1, 9, 13, and 14 have the same functions.

Further, since the circuit of the in-phase signal system has only to handle the video signal in the same band as the multiplex signal, it is possible to set the system clock frequency to a low value, and the number of taps of the transversal filter can be greatly reduced. May be reduced to

This embodiment is different from the seventh embodiment in that the waveform equalization circuit for the in-phase signal is deleted when the reception environment is good such that the transmission distortion of the in-phase signal does not affect much. It is intended to reduce the scale.

Also in this embodiment, the video signal control circuit 1
11. Since the sequence signal decoding process, the difference process, and the noise removal process have already been performed on the multiplex signal control circuit 905, it is possible to constantly supply the video signal and the multiplex signal in which the GCR signals having the same polarity for each field are inserted. Since it is not necessary to perform code processing, difference processing, noise removal processing, etc. in the above sequence each time the tap coefficient is updated, there is an effect that the time required for transmission distortion removal processing and crosstalk removal processing can be shortened.

Further, the GCR signal of the video signal is always used for the GC
Since the polarity of the R signal in the current field can be determined, there is an effect that stable transmission sequence decoding processing can be performed.

Further, the video signal preprocessing circuit 108, the in-phase signal preprocessing circuit 1303, the quadrature signal preprocessing circuit 902,
Since the degree of noise improvement of the noise removal circuit in the orthogonal crosstalk signal preprocessing circuit 115 can be set independently of each other, when the waveform equalization processing in the subsequent stage and the crosstalk removal processing are performed in time division, the time There is an effect that the degree of noise improvement of the noise removal circuit in the pre-processing circuit necessary for subsequent processing can be increased (the time constant is increased).

Furthermore, according to the present embodiment, the orthogonal signal reproducing function can be easily added to the existing television receiver having a built-in ghost canceller, and a good multiplexed signal can be obtained with a small circuit scale. The effect is that you can do it.

Note that the above embodiment is a GC for orthogonal multiplexing.
Although the case of the sequence as shown in FIG. 8B is shown as the R signal, when it is transmitted in another sequence, the decoding circuit 111 in the field discrimination circuits 901 and 1401 is used.
The combination of 1, 1112, and 1113, the 2-field delay circuit 1002 in the quadrature signal preprocessing circuit 902, the subtractor 1003, the 4-field delay circuit 1004, and the adder 1
Since it can be easily dealt with by changing the combination of 005, the same effect as in the case of the present embodiment can be obtained.

[0166]

According to the present invention, the waveform equalizing means and 2
Since it is possible to obtain the reference signal that has been subjected to the transmission sequence decoding process, the difference process, or the noise removal process all the time before the input waveform equalizing means, it is not necessary to perform these processes each time the tap coefficient is updated. This has the effect of reducing the time required to remove distortion due to transmission distortion and crosstalk.

Since the polarity of the reference signal in the current field is always determined from the transmission sequence of the reference signal of the video signal, the certainty of the transmission sequence decoding process can be improved.

[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 configuration example of the video signal preprocessing circuit shown in FIG.

FIG. 3 is a block diagram showing a configuration example of a quadrature crosstalk signal preprocessing circuit shown in FIG.

FIG. 4 is a block diagram showing a configuration example of the field discrimination circuit shown in FIG.

5 is a block diagram showing a configuration example of the video signal waveform equalization circuit shown in FIG.

6 is a block diagram showing a configuration example of a two-input waveform equalization circuit shown in FIG.

FIG. 7 is a waveform diagram and a spectrum diagram showing a specific example of a reference signal of an orthogonal multiplex signal.

FIG. 8 is a waveform diagram showing a specific example of a reference signal of an orthogonal multiplex signal.

FIG. 9 is a block diagram showing a transmission signal reproducing device as a second embodiment of the present invention.

10 is a block diagram showing a configuration example of a quadrature signal preprocessing circuit shown in FIG.

11 is a block diagram showing a configuration example of the field discrimination circuit shown in FIG.

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

FIG. 13 is a block diagram showing a transmission signal reproducing device as a fourth embodiment of the present invention.

FIG. 14 is a block diagram showing a transmission signal reproducing device as a fifth embodiment of the present invention.

FIG. 15 is a block diagram showing a transmission signal reproducing device as a sixth embodiment of the present invention.

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

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

FIG. 18 is a block diagram showing a transmission signal reproducing device as a ninth embodiment of the present invention.

[Explanation of symbols]

 101 ... Antenna, 102 ... High frequency amplifier circuit, 103 ... Frequency conversion circuit, 104 ... Local oscillation circuit, 105 ... Tuning control circuit, 106 ... Nyquist filter, 107 ... Video signal detection circuit, 108 ... Video signal pre-processing circuit, 109 ... field discrimination circuit, 110 ... video signal waveform equalization circuit, 111 ... video signal control circuit, 112 ... video signal output terminal, 113 ... band pass filter, 114 ... quadrature detection circuit, 115 ... quadrature crosstalk signal pre-processing circuit, 116 ... Low-pass filter, 117 ... 2-input waveform equalization circuit, 118 ... Multiplex signal control circuit, 119 ... Multiplex signal output terminal, 120 ... Timing generation circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takatoshi Sugisugi 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Ltd.Inside the Hitachi Media Visual Media Research Institute (72) Inventor Noritaka Hotta 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock company Hitachi Image Information Systems (72) Inventor Tsutomu Noda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Video Media Research Institute (72) Inventor Toshiyuki Kurita 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Media Media Research Laboratories (72) Inventor Moriyoshi Akiyama 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Stock Company Hitachi Media Media Research Laboratories

Claims (21)

[Claims] 1. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detecting means (107) for obtaining a video signal, and a reference signal field judging means (109) for judging the field of the reference signal from the transmission sequence of the reference signal of the video signal obtained at the detection output of the video signal detecting means. A video reference signal preprocessing means for performing signal processing on the reference signal of the video signal obtained by the detection output of the video signal detection means according to the field determined by the reference signal field determination means, and outputting the processed signal ( 108) and the output signal of the video reference signal pre-processing means, and a transmission distortion due to a ghost of the video signal using a transversal filter. The first waveform equalizing means (11
0), and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling the tap coefficient of the transversal filter of the first waveform equalizer. Means (111), a quadrature detection means (114) for synchronously detecting the transmitted signal to obtain a quadrature detection output, and a detection output of the quadrature detection means according to the field determined by the reference signal field determination means. Orthogonal crosstalk signal preprocessing means (11) for performing signal processing on the signal of the obtained video signal in the reference signal period and outputting the processed signal.
5), a low-pass filter (116) for passing a low frequency component of the output signal of the first waveform equalizing means, an output signal of the low-pass filter and an output signal of the quadrature crosstalk signal pre-processing means Then, using a transversal filter, a two-input waveform equalizing means (1) for removing distortion due to crosstalk between the video signal and the orthogonal multiplex signal
17), and second control means (118) for detecting distortion due to crosstalk from the output signal of the two-input waveform equalizing means and controlling the tap coefficient of the transversal filter of the two-input waveform equalizing means, A transmission signal reproducing apparatus comprising: 2. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detecting means (107) for obtaining a video signal, and a reference signal field judging means (901) for judging the field of the reference signal from the transmission sequence of the reference signal of the video signal obtained at the detection output of the video signal detecting means. A video reference signal preprocessing means for performing signal processing on the reference signal of the video signal obtained by the detection output of the video signal detection means according to the field determined by the reference signal field determination means, and outputting the processed signal ( 108) and the output signal of the video reference signal pre-processing means, and a transmission distortion due to a ghost of the video signal using a transversal filter. The first waveform equalizing means (11
0), and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling the tap coefficient of the transversal filter of the first waveform equalizer. Means (111), a quadrature detection means (114) for synchronously detecting the transmitted signal to obtain a quadrature detection output, and a detection output of the quadrature detection means according to the field determined by the reference signal field determination means. A quadrature reference signal preprocessing unit (902) that performs signal processing on the obtained reference signal of the quadrature multiplexed signal and outputs the processed signal, and a quadrature detection unit of the quadrature detection unit according to the field determined by the reference signal field determination unit. Orthogonal crosstalk signal pre-processing means (11) for performing signal processing on the signal in the reference signal period of the video signal obtained at the detection output and outputting the processed signal.
5), selection means (903) for switching between the output signal of the orthogonal reference signal preprocessing means and the output signal of the orthogonal crosstalk signal preprocessing means, and the low frequency of the output signal of the first waveform equalization means. A low-pass filter (116) that allows components to pass, an output signal of the low-pass filter and an output signal of the selecting means are input, and a transversal filter is used to remove distortion due to crosstalk between the video signal and the orthogonal multiplex signal. A two-input waveform equalizing means (117) and a second waveform equalizing means for inputting an output signal of the two-input waveform equalizing means and removing transmission distortion due to ghost of a multiple signal using a transversal filter ( 904)
And detecting the distortion due to crosstalk and the transmission distortion due to the ghost of the multiplexed signal from the output signal of the two-input waveform equalizer and the output signal of the second waveform equalizer, and controlling the switching of the selector. And a second control means (905) for controlling the tap coefficient of the transversal filter of the two-input waveform equalizing means and the second waveform equalizing means. apparatus. 3. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detecting means (107) for obtaining a video signal, and a reference signal field judging means (901) for judging the field of the reference signal from the transmission sequence of the reference signal of the video signal obtained at the detection output of the video signal detecting means. A video reference signal preprocessing means for performing signal processing on the reference signal of the video signal obtained by the detection output of the video signal detection means according to the field determined by the reference signal field determination means, and outputting the processed signal ( 108), a quadrature detection means (114) for synchronously detecting the transmitted signal to obtain a quadrature detection output, and the reference signal field determination means. A quadrature reference signal preprocessing means (902) for subjecting the reference signal of the quadrature multiplexed signal obtained in the detection output of the quadrature detection means to a signal output according to the field and outputting the processed signal; Quadrature crosstalk signal preprocessing means (11) for subjecting the signal of the reference signal period of the obtained video signal to the detection output of the quadrature detection means in accordance with the field determined by the means, and outputting the processed signal.
5), selection means (903) for switching between the output signal of the orthogonal reference signal preprocessing means and the output signal of the orthogonal crosstalk signal preprocessing means, and a low frequency component of the output signal of the video reference signal preprocessing means. A low-pass filter (116) for passing the signal, an output signal of the low-pass filter and an output signal of the selecting means are input, and distortion due to crosstalk between the video signal and the orthogonal multiplex signal is removed using a transversal filter. An input waveform equalizing means (117); a waveform equalizing means (904) for inputting the output signals of the two-input waveform equalizing means and removing transmission distortion due to ghost of multiple signals using a transversal filter; Distortion due to crosstalk and ghost of multiple signals from the output signal of the two-input waveform equalizing means and the output signal of the waveform equalizing means. A control means (905) for detecting a transmission distortion due to which, controlling the switching of the selecting means, and controlling the tap coefficient of the transversal filter of the two-input waveform equalizing means and the waveform equalizing means. A transmission signal reproducing device characterized by: 4. A transmission signal reproducing apparatus for receiving and reproducing a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, by synchronously detecting the transmitted signal. A video signal detection means (107) for obtaining a video signal, a detection means (114, 1302) for synchronously detecting the transmitted signal to obtain a detection output in quadrature and an in-phase, and an in-phase detection output of the detection means. A reference signal field discriminating means (1304) for discriminating a field of the reference signal from the transmission sequence of the reference signal of the video signal, and an in-phase detection output of the detecting means according to the field discriminated by the reference signal field discriminating means. An in-phase reference signal pre-processing unit (1303) for performing signal processing on the reference signal of the video signal thus obtained and outputting the processed signal; Of the output signal, the first waveform equalizing means for removing channel distortion due to the ghost of the video signal using a transversal filter (130
5) and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling a tap coefficient of a transversal filter of the first waveform equalizer. Means (1306) and signal processing is performed on the signal in the reference signal period of the obtained video signal in the orthogonal detection output of the detection means according to the field determined by the reference signal field determination means, and the processed signal is output. Orthogonal crosstalk signal preprocessing means (11
5), and the output signal of the first waveform equalizing means and the output signal of the orthogonal crosstalk signal preprocessing means are input, and distortion due to crosstalk between the video signal and the orthogonal multiplex signal is used by using a transversal filter. And a two-input waveform equalizing means (117) for removing the signal, and detecting distortion due to crosstalk from the output signal of the two-input waveform equalizing means, and controlling the tap coefficient of the transversal filter of the two-input waveform equalizing means. A second control means (118); and a transmission signal reproducing device comprising: 5. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detection means (107) for obtaining a video signal, a detection means (114, 1302) for synchronously detecting the transmitted signal to obtain a detection output in quadrature and an in-phase, and an in-phase detection output of the detection means. A reference signal field discriminating means (1401) for discriminating a field of the reference signal from the transmission sequence of the reference signal of the video signal, and an in-phase detection output of the detecting means according to the field discriminated by the reference signal field discriminating means. An in-phase reference signal pre-processing unit (1303) for performing signal processing on the reference signal of the video signal thus obtained and outputting the processed signal; Of the output signal, the first waveform equalizing means for removing channel distortion due to the ghost of the video signal using a transversal filter (130
5) and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling a tap coefficient of a transversal filter of the first waveform equalizer. Means (1306) and a quadrature for subjecting the reference signal of the quadrature multiplexed signal obtained to the quadrature detection output of the detection means according to the field discriminated by the reference signal field discrimination means, and outputting the processed signal. Reference signal preprocessing means (902) and signal processing is performed on the signal in the reference signal period of the video signal obtained in the orthogonal detection output of the detection means according to the field discriminated by the reference signal field discrimination means, and processed. Orthogonal crosstalk signal preprocessing means (11)
5), selection means (903) for switching between the output signal of the quadrature reference signal preprocessing means and the output signal of the quadrature crosstalk signal preprocessing means, and the output signal of the first waveform equalization means and the selection. And an output signal of the means, and a two-input waveform equalizing means (117) for removing distortion due to crosstalk between the video signal and the orthogonal multiplex signal using a transversal filter; and an output of the two-input waveform equalizing means. Second waveform equalizing means (904) for inputting a signal and removing transmission distortion due to ghost of a multiple signal using a transversal filter
And detecting the distortion due to crosstalk and the transmission distortion due to the ghost of the multiplexed signal from the output signal of the two-input waveform equalizer and the output signal of the second waveform equalizer, and controlling the switching of the selector. And a second control means (905) for controlling the tap coefficient of the transversal filter of the two-input waveform equalizing means and the second waveform equalizing means. apparatus. 6. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detection means (107) for obtaining a video signal, a detection means (114, 1302) for synchronously detecting the transmitted signal to obtain a detection output in quadrature and an in-phase, and an in-phase detection output of the detection means. A reference signal field discriminating means (1401) for discriminating a field of the reference signal from the transmission sequence of the reference signal of the video signal, and an in-phase detection output of the detecting means according to the field discriminated by the reference signal field discriminating means. An in-phase reference signal preprocessing means (1303) for performing signal processing on the reference signal of the video signal thus obtained and outputting the processed signal; Quadrature reference signal preprocessing means (902) for subjecting the reference signal of the quadrature multiplexed signal obtained in the quadrature detection output of the detection means to signal processing according to the field determined by the means, and outputting the processed signal; Quadrature crosstalk signal pre-processing for subjecting the signal in the reference signal period of the obtained video signal to the orthogonal detection output of the detection means in accordance with the field discriminated by the reference signal field discrimination means, and outputting the processed signal Means (11
5), selecting means (903) for switching between the output signal of the quadrature reference signal preprocessing means and the output signal of the quadrature crosstalk signal preprocessing means, and the output signal of the in-phase reference signal preprocessing means and the selecting means. And an output signal of the two-input waveform equalizing means for removing distortion due to crosstalk between the video signal and the orthogonal multiplex signal by using a transversal filter. And a waveform equalizing means (904) for removing transmission distortion due to ghost of a multiplexed signal using a transversal filter, an output signal of the two-input waveform equalizing means and an output signal of the waveform equalizing means. From this, distortion due to crosstalk and transmission distortion due to ghost of multiple signals are detected, switching control of the selecting means is performed, and the two input waveforms are detected. And a control means (905) for controlling the tap coefficient of the transversal filter of the equalization means and the waveform equalization means. 7. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detecting means (107) for obtaining a video signal, and a first reference signal field determining means (step 1) for determining the field of the reference signal from the transmission sequence of the reference signal of the video signal obtained at the detection output of the video signal detecting means ( 109)
And a video reference signal for subjecting the reference signal of the video signal obtained by the detection output of the video signal detection means to signal processing according to the field determined by the first reference signal field determination means, and outputting the processed signal. A first waveform equalizing means (11) for inputting the output signal of the pre-processing means (108) and the video reference signal pre-processing means and removing transmission distortion due to ghost of the video signal using a transversal filter.
0), and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling the tap coefficient of the transversal filter of the first waveform equalizer. Means (111), detection means (114, 1302) for synchronously detecting the transmitted signal to obtain a quadrature and in-phase detection output, and a reference signal of the video signal obtained in the in-phase detection output of the detection means. Second reference signal field discriminating means (1304) for discriminating the field of the reference signal from the transmission sequence.
And an in-phase reference signal for subjecting the reference signal of the obtained video signal to the in-phase detection output of the detection means in accordance with the field determined by the second reference signal field determination means, and outputting the processed signal. A second waveform equalizing means (130) for inputting an output signal of the pre-processing means (1303) and the in-phase reference signal pre-processing means and removing transmission distortion due to a ghost of a video signal using a transversal filter.
5) and a second control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the second waveform equalizer and controlling a tap coefficient of a transversal filter of the second waveform equalizer. Means (1306) and the signal of the reference signal period of the video signal obtained in the orthogonal detection output of the detection means according to the field discriminated by the second reference signal field discrimination means, and processed. A quadrature crosstalk signal preprocessing means (115) for outputting a signal, an output signal of the second waveform equalization means and an output signal of the quadrature crosstalk signal preprocessing means are input, and a transversal filter is used. Two-input waveform equalizing means (117) for removing distortion due to crosstalk between the video signal and the orthogonal multiplex signal, and crosstalk from the output signal of the two-input waveform equalizing means. And a third control means (118) for detecting the distortion caused by the above and controlling the tap coefficient of the transversal filter of the two-input waveform equalization means. 8. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detecting means (107) for obtaining a video signal, and a first reference signal field determining means (step 1) for determining the field of the reference signal from the transmission sequence of the reference signal of the video signal obtained at the detection output of the video signal detecting means ( 109)
And a video reference signal for subjecting the reference signal of the video signal obtained by the detection output of the video signal detection means to signal processing according to the field determined by the first reference signal field determination means, and outputting the processed signal. A first waveform equalizing means (11) for inputting the output signal of the pre-processing means (108) and the video reference signal pre-processing means and removing transmission distortion due to ghost of the video signal using a transversal filter.
0), and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling the tap coefficient of the transversal filter of the first waveform equalizer. Means (111), detection means (114, 1302) for synchronously detecting the transmitted signal to obtain a quadrature and in-phase detection output, and a reference signal of the video signal obtained in the in-phase detection output of the detection means. Second reference signal field discriminating means (1401) for discriminating the field of the reference signal from the transmission sequence.
And an in-phase reference signal for subjecting the reference signal of the obtained video signal to the in-phase detection output of the detection means in accordance with the field determined by the second reference signal field determination means, and outputting the processed signal. A second waveform equalizing means (130) for inputting an output signal of the pre-processing means (1303) and the in-phase reference signal pre-processing means and removing transmission distortion due to a ghost of a video signal using a transversal filter.
5) and a second control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the second waveform equalizer and controlling a tap coefficient of a transversal filter of the second waveform equalizer. Means (1306) and the reference signal of the orthogonal multiplex signal obtained in the orthogonal detection output of the detection means in accordance with the field discriminated by the second reference signal field discrimination means, and the processed signal is A quadrature reference signal preprocessing means (902) for outputting, and a signal in the reference signal period of the video signal obtained in the quadrature detection output of the detection means according to the field discriminated by the second reference signal field discrimination means. Orthogonal crosstalk signal preprocessing means (115) for performing signal processing and outputting the processed signal, and an output signal of the orthogonal reference signal preprocessing means and the orthogonal crosstalk signal. Selection means (903) for switching between the output signal of the signal preprocessing means, the output signal of the second waveform equalization means and the output signal of the selection means are input, and the signals are orthogonal to the video signal using a transversal filter. A two-input waveform equalizing means (117) for removing distortion due to crosstalk with a multiple signal, and an output signal of the two-input waveform equalizing means, and a transmission distortion due to a ghost of the multiple signal using a transversal filter. Third waveform equalizing means for removing the noise (904)
And the output signal of the two-input waveform equalizer and the output signal of the third waveform equalizer, the distortion due to crosstalk and the transmission distortion due to the ghost of the multiplexed signal are detected, and the switching control of the selector is performed. And a third control means (905) for controlling the tap coefficient of the transversal filter of the two-input waveform equalization means and the third waveform equalization means. apparatus. 9. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and synchronously detects the transmitted signal. A video signal detecting means (107) for obtaining a video signal, and a first reference signal field determining means (step 1) for determining the field of the reference signal from the transmission sequence of the reference signal of the video signal obtained at the detection output of the video signal detecting means ( 109) and a video signal obtained by subjecting the reference signal of the obtained video signal to the detection output of the video signal detection means according to the field determined by the first reference signal field determination means, and outputting the processed signal. A reference signal pre-processing unit (108) and the output signal of the video reference signal pre-processing unit are input, and a ghost of a video signal or the like using a transversal filter. First waveform equalization means (11) for removing transmission distortion due to
0), and a first control for detecting a transmission distortion due to a ghost of a video signal from the output signal of the first waveform equalizer and controlling the tap coefficient of the transversal filter of the first waveform equalizer. Means (111), detection means (114, 1302) for synchronously detecting the transmitted signal to obtain a quadrature and in-phase detection output, and a reference signal of the video signal obtained in the in-phase detection output of the detection means. Second reference signal field discriminating means (1401) for discriminating the field of the reference signal from the transmission sequence.
And an in-phase reference signal for subjecting the reference signal of the obtained video signal to the in-phase detection output of the detection means in accordance with the field determined by the second reference signal field determination means, and outputting the processed signal. According to the field discriminated by the pre-processing means (1303) and the second reference signal field discriminating means, the reference signal of the orthogonal multiplex signal obtained in the orthogonal detection output of the detecting means is subjected to signal processing and processed. A quadrature reference signal pre-processing means (902) for outputting a signal, and a reference signal period of the video signal obtained in the quadrature detection output of the detection means in accordance with the field discriminated by the second reference signal field discrimination means. An orthogonal crosstalk signal preprocessing means (115) for subjecting the signal to signal processing and outputting the processed signal, an output signal of the orthogonal reference signal preprocessing means and the orthogonal clock. A selection unit (903) for switching between the output signal of the loss talk signal pre-processing unit and the output signal of the in-phase reference signal pre-processing unit and the output signal of the selection unit are input, and a transversal filter is used to orthogonalize the video signal. A two-input waveform equalizing means (117) for removing distortion due to crosstalk with a multiple signal, and an output signal of the two-input waveform equalizing means, and a transmission distortion due to a ghost of the multiple signal using a transversal filter. Second waveform equalization means (904) for removing
And detecting the distortion due to crosstalk and the transmission distortion due to the ghost of the multiplexed signal from the output signal of the two-input waveform equalizer and the output signal of the second waveform equalizer, and controlling the switching of the selector. And a second control means (905) for controlling the tap coefficient of the transversal filter of the two-input waveform equalizing means and the second waveform equalizing means. apparatus. 10. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and inputs the detected video signal, A first waveform equalizing means (110) for removing transmission distortion due to a ghost of a video signal using a transversal filter, and transmission distortion due to a ghost of a video signal from an output signal of the first waveform equalizing means. First control means (111) for detecting and controlling the tap coefficient of the transversal filter of the first waveform equalization means; and a low-pass for passing the low frequency component of the output signal of the first waveform equalization means. A filter (116), the output signal of the low-pass filter and the detected orthogonal multiplex signal are input, and a video signal and orthogonal multiplex signal are obtained using a transversal filter. And a two-input waveform equalization means (117) for removing distortion due to crosstalk between the two-input waveform equalization means and a transversal filter of the two-input waveform equalization means for detecting distortion due to crosstalk from the output signal of the two-input waveform equalization means. And a second control means (118) for controlling the tap coefficient of the transmission signal reproducing device. 11. A transmission signal reproducing apparatus for receiving and reproducing a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and inputting the detected video signal, A first waveform equalizing means (110) for removing transmission distortion due to a ghost of a video signal using a transversal filter, and transmission distortion due to a ghost of a video signal from an output signal of the first waveform equalizing means. First control means (111) for detecting and controlling the tap coefficient of the transversal filter of the first waveform equalization means; and a low-pass for passing the low frequency component of the output signal of the first waveform equalization means. A filter (116), the output signal of the low-pass filter and the detected orthogonal multiplex signal are input, and a video signal and orthogonal multiplex signal are obtained using a transversal filter. A two-input waveform equalization means (117) for removing distortion due to crosstalk with the input signal and an output signal of the two-input waveform equalization means are input, and a transversal filter is used to remove transmission distortion due to ghost of multiple signals. Second waveform equalizing means (904)
And detecting the distortion due to crosstalk and the transmission distortion due to the ghost of the multiplexed signal from the output signal of the two-input waveform equalizer and the output signal of the second waveform equalizer, and the two-input waveform equalizer. And a second control unit (905) for controlling the tap coefficient of the transversal filter of the second waveform equalization unit, and a transmission signal reproducing apparatus comprising: 12. A transmission signal reproducing apparatus which receives and reproduces a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, the detected video signal being inputted, A first waveform equalizer (1305) for removing transmission distortion due to a ghost of a video signal by using a transversal filter, and a transmission distortion due to a ghost of a video signal from an output signal of the first waveform equalizer. First control means (1306) for detecting and controlling the tap coefficient of the transversal filter of the first waveform equalization means; and an output signal of the first waveform equalization means and a detected orthogonal multiplex signal. And a 2-input waveform equalizing means (117) for removing distortion due to crosstalk between the video signal and the orthogonal multiplex signal using a transversal filter, and the 2 inputs Second control means (118) for detecting distortion due to crosstalk from the output signal of the waveform equalization means and controlling the tap coefficient of the transversal filter of the two-input waveform equalization means. Transmission signal reproducing device. 13. A transmission signal reproducing apparatus for receiving and reproducing a method of multiplex-transmitting another signal by a carrier orthogonal to a video carrier of a vestigial sideband amplitude-modulated video signal, and inputting the detected video signal, A first waveform equalizer (1305) for removing transmission distortion due to a ghost of a video signal by using a transversal filter, and a transmission distortion due to a ghost of a video signal from an output signal of the first waveform equalizer. First control means (1306) for detecting and controlling the tap coefficient of the transversal filter of the first waveform equalization means; and an output signal of the first waveform equalization means and a detected orthogonal multiplex signal. And a 2-input waveform equalizing means (117) for removing distortion due to crosstalk between the video signal and the orthogonal multiplex signal using a transversal filter, and the 2 inputs Second waveform equalizing means (904) for inputting the output signal of the waveform equalizing means and removing transmission distortion due to ghost of multiple signals using a transversal filter
And detecting the distortion due to crosstalk and the transmission distortion due to the ghost of the multiplexed signal from the output signal of the two-input waveform equalizer and the output signal of the second waveform equalizer, and the two-input waveform equalizer. And a second control unit (905) for controlling the tap coefficient of the transversal filter of the second waveform equalization unit, and a transmission signal reproducing apparatus comprising: 14. The transmission signal reproducing apparatus according to claim 1, wherein the video reference signal preprocessing means (108) and the orthogonal crosstalk signal preprocessing means (115) remove at least noise included in the reference signal. It is configured by a noise removing means, and the noise improvement degree of the orthogonal crosstalk signal pre-processing means noise removal means is set to a larger value than the noise improvement degree of the video reference signal pre-processing means noise removal means. Transmission signal reproducing device. 15. The transmission signal reproducing apparatus according to claim 2, wherein said video reference signal preprocessing means (108), said orthogonal reference signal preprocessing means (902) and said orthogonal crosstalk signal preprocessing means (115). , At least noise removal means for removing noise contained in the reference signal, and the noise removal means in the orthogonal crosstalk signal preprocessing means is more than the noise improvement degree of the noise removal means in the video reference signal preprocessing means. Further, the noise improvement degree is set to a value larger than the noise improvement degree of the noise removing means in the orthogonal reference signal preprocessing means than the noise improvement degree of the noise removing means in the orthogonal crosstalk signal preprocessing means. And a transmission signal reproducing device. 16. A transmission signal reproducing apparatus according to claim 3, wherein said video reference signal preprocessing means (108), said orthogonal reference signal preprocessing means (902) and said orthogonal crosstalk signal preprocessing means (115). , At least noise removal means for removing noise contained in the reference signal, noise improvement degree of the noise removal means in the video reference signal preprocessing means and noise of noise removal means in the orthogonal crosstalk signal preprocessing means A transmission signal reproducing apparatus, characterized in that the noise improvement degree of the noise removing means in the orthogonal reference signal preprocessing means is set to a value larger than the improvement degree. 17. The transmission signal reproducing apparatus according to claim 4 or 7, wherein at least the reference signal includes the in-phase reference signal preprocessing means (1303) and the quadrature crosstalk signal preprocessing means (115). The noise reduction means for eliminating noise is set, and the noise improvement degree of the orthogonal crosstalk signal preprocessing means noise removal means is set to a larger value than the noise improvement degree of the in-phase reference signal preprocessing means noise removal means. A transmission signal reproducing device characterized by the above. 18. The transmission signal reproducing device according to claim 5, wherein the in-phase reference signal preprocessing means (1303), the quadrature reference signal preprocessing means (902) and the quadrature crosstalk signal preprocessing means. (115) is composed of a noise removing means for removing at least noise contained in the reference signal, and the degree of noise improvement in the orthogonal crosstalk signal preprocessing means is higher than the noise improvement degree of the noise removing means in the in-phase reference signal preprocessing means. The noise improvement degree of the noise removing means is set to a value larger than the noise improvement degree of the noise removing means in the orthogonal reference signal preprocessing means than the noise improvement degree of the noise removing means in the orthogonal crosstalk signal preprocessing means. A transmission signal reproducing device characterized by: 19. The transmission signal reproducing apparatus according to claim 6 or 9, wherein said in-phase reference signal preprocessing means (1303), said quadrature reference signal preprocessing means (902) and said quadrature crosstalk signal preprocessing means. (115) is constituted by noise removing means for removing at least noise included in the reference signal, and the noise improvement degree of the noise removing means in the in-phase reference signal preprocessing means and the noise in the quadrature crosstalk signal preprocessing means A transmission signal reproducing apparatus characterized in that the noise improvement degree of the noise removing means in the orthogonal reference signal preprocessing means is set to a value larger than the noise improvement degree of the removing means. 20. A transmission signal reproducing apparatus according to claim 2, claim 3, claim 5, claim 6, claim 8, or claim 9, wherein said reference signal field discriminating means (901, 1401).
A polarity detection means (1103) for inputting the code signal from the video reference signal preprocessing means or the in-phase reference signal preprocessing means, detecting the polarity of the reference signal of the video signal and instructing the polarity signal, Registers (1104, 1105, 1) that hold the output polarity signals for at least four fields
106, 1107), a first decoder (1108, 1109, 1110) for outputting a control signal according to the transmission sequence of the reference signal of the video signal from the plurality of outputs of the register, and the multiple outputs from the plurality of outputs of the register. A second decoder (1111, 1112, 1113) for outputting a control signal according to the transmission sequence of the reference signal of the signal; 21. Claim 1 or Claim 2 or Claim 3 or Claim 4 or Claim 5 or Claim 6 or Claim 7 or Claim 8 or Claim 9.
In the transmission signal reproducing apparatus described in the above, the waveform equalization means (110, 904, 1305) is configured by a cascade connection of a non-recursive filter and a recursive filter using a transversal filter, and the two-input waveform equalization means. (117) is a non-recursive filter using a transversal filter, wherein the transmission signal reproducing device is characterized.