JP3087354B2 - Multiplex signal reproduction device and video signal processing device - Google Patents

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 multiplex transmission system for multiplexing other information with an existing television signal and receiving and reproducing the multiplexed transmission signal.
The present invention relates to a raw device and a video signal processing device .

[0002]

2. Description of the Related Art Conventionally, as a method of multiplexing other information with a television signal, as described in Japanese Patent Application Laid-Open No. 63-36694, a quadrature carrier having a quadrature phase relationship with a video carrier is used as another information. 2. Description of the Related Art A quadrature modulation method in which a modulated signal is combined with a video carrier modulated by a video signal and transmitted is known.

[0003] On the other hand, the 1989 National Convention of the Institute of Television Engineers, pp. 307 to 308 13-12
Examination and experiment of wide aspect image transmission system, and 1
As described in pp. 359 to 360 of the 990 Annual Conference of the Institute of Television Engineers of Japan, 21-1 Comparison of various widening systems from current receivers, the 2nd generation E
A wide aspect of a television screen is being studied as a DTV. Various widening methods are letter box method,
It can be roughly divided into the side panel method and the intermediate method,
Here, a letter box system related to the present invention will be briefly described with reference to FIG. FIG. 4 is a schematic diagram of a television screen in which the horizontal direction indicates the horizontal scanning direction and the vertical direction indicates the vertical scanning direction. Reference numeral 401 denotes an upper mask portion, 402 denotes a lower mask portion, and 403 denotes a television image display portion. The 16: 9 wide aspect image will be displayed in some form on the display of the current 4: 3 aspect NTSC receiver, and the letterbox method is considered as one of the display methods. The letter box method is a method in which the left and right sides of a wide aspect image are displayed on a full screen as a display portion 403 and the upper and lower mask portions 401 and 402 are blank portions as shown in FIG.

[0004] One method of realizing the letterbox method is described in "Prototype Production of 21-8 Letterbox Type Wide EDTV Encoder / Decoder" in the 1990 Annual Conference of the Institute of Television Engineers of Japan, pp. 373-374. According to this, the vertical and temporal auxiliary signals are multiplexed and transmitted to the upper and lower mask portions and the luminance and horizontal high-definition information are multiplexed to the display portion, so that the dynamic resolution and the horizontal resolution are improved simultaneously with the widening.

[0005] Furthermore, a report combining the letterbox system and the quadrature modulation system is reported in the 1991 Technical Report of the Institute of Television Engineers of Japan, Vol. 15, No. 32 pages 7 to 12 are described in a prototype experiment of an EDTV that combines high-quality wide images and digital audio. This report describes combinations of video signals and multiplexed signals as shown in the following (a) and (b). (A) A quadrature modulation method in which a quadrature carrier having a quadrature phase relationship with a video carrier is modulated with other information (hereinafter, referred to as a multiplexed signal), combined with a video carrier modulated with a letterbox video signal, and transmitted. (B) A quadrature carrier having a quadrature relationship with a video carrier is modulated by a multiplex signal, and a vertical-time auxiliary signal is multiplexed on upper and lower mask portions of a letterbox system (hereinafter, a signal multiplexed on these mask portions is a mask portion multiplexed signal). A quadrature modulation method in which luminance horizontal high definition information is combined with a video carrier modulated by a video signal multiplexed and transmitted on a display portion and transmitted.

[0006]

In the above-mentioned prior art combining the letterbox system and the quadrature modulation system, the receiver was not described in detail. Hereinafter, a receiver that performs stable demodulation will be considered.

In the quadrature modulation method, crosstalk occurs between the multiplexed signal and the video signal due to an imbalance in the characteristics of the filters on the transmission side and the reception side, a shift in the detection axis of the receiver, and a ghost disturbance. Considering these phenomena,
The following points should be noted when considering the use of the quadrature modulation method together with the letterbox method or the intermediate method.

(1) When the mask portion multiplex signal is not multiplexed in the mask portion, there is no problem even if the crosstalk from the multiplex signal in the mask portion slightly increases. (2) In the case where the mask portion multiplexed signal is multiplexed in the mask portion, it is desirable that the crosstalk from the multiplexed signal in the mask portion be small. (3) The modulation degree of the video signal is low in the mask portion.

It is an object of the present invention to take advantage of the fact that the degree of modulation of the mask portion is low in the case of a video signal of the letter box system shown in (3) above, in particular, of the above-mentioned points of interest, and is orthogonal to the letter box system or the like. Optimal when using a modulation method together,
A multiplex signal reproducing apparatus and a multiplex signal reproducing apparatus for receiving multiplex signals transmitted by orthogonal multiplexing, which are less affected by ghosts, video signals, etc.
It is to provide a signal processing device.

[0010]

Means for Solving the Problems In order to achieve the above object, the present invention has the following configuration. The configuration consists of a quadrature carrier having a quadrature phase relationship with a video carrier, which is modulated by a multiplexed signal, combined with a video carrier modulated by a video signal such as a letter-box method, and a quadrature multiplex transmission signal is received and reproduced. A mask part detecting means for receiving and reproducing a video signal of the letterbox system or the like to detect an upper and lower mask part of the letterbox system, and a horizontal synchronizing signal or a clock signal of a digital circuit in the receiver at the upper and lower mask parts. Control signal reproducing means for reproducing, or carrier reproducing means for reproducing a carrier wave for synchronous detection.

[0011]

The mask portion detecting means receives and reproduces a video signal of the letter box method or the like to detect upper and lower mask parts of the letter box method or the like, and the control signal reproducing means or the carrier wave reproducing means horizontally synchronizes the upper and lower mask parts. It reproduces a signal or a clock signal of a digital circuit in a receiver, or reproduces a carrier wave for synchronous detection.

Since the degree of modulation of the video signal is low in the mask portion, the influence of a ghost or a change in the video signal is small, so that the horizontal synchronizing signal and the clock signal reproduced from the color burst are stably demodulated and received and reproduced. Since the control signal of the multiplexed signal obtained as described above and the carrier wave reproduction for synchronous detection can be stably performed, the multiplexed signal can be demodulated stably.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention. FIG. 1 is a diagram for receiving a signal transmitted by orthogonally modulating a letterbox video signal and a multiplexed signal.

In FIG. 1, reference numeral 101 denotes an antenna;
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 detection circuit, 108 is an audio signal detection circuit, 109 is an audio signal output terminal, 110 Is a video signal output terminal, 111 is a band pass filter (hereinafter referred to as BPF
, 112 is a synchronous detection circuit, 113 is a signal processing circuit, 114 is a multiplexed signal output terminal, 115 is a synchronous detection circuit, 116 is a mask part detection circuit, and 117 is a signal reproduction circuit.

A television signal input from an antenna 101 is amplified by a high-frequency amplifier circuit 102 and frequency-converted in a frequency conversion circuit 103 by a signal from a local oscillation circuit 104. At this time, the tuning is performed by converting the signal frequency of the local oscillation circuit 104 by the tuning control circuit 105.

Next, the signal output from the frequency conversion circuit 103 is input to a Nyquist filter 106, where a necessary band is extracted. The signal output from the Nyquist filter 106 is demodulated by the video detection circuit 107,
A video signal is obtained at a video signal output terminal 110. at the same time,
An audio carrier of the television signal whose frequency has been converted to 4.5 MHz is extracted and input to the audio detection circuit 108. Then, FM detection is performed, and an audio signal is obtained at an audio signal output terminal 109.

On the other hand, the signal output from the frequency conversion circuit 103 extracts a necessary band by the BPF 111, and the multiplexed signal is demodulated by the synchronous detection circuit 112.

The demodulated video signal output from the video detection circuit 107 is of a letterbox system. The video signal is input to a synchronization detection circuit 115 to reproduce a horizontal synchronization signal, a vertical synchronization signal, and the like. Partial detection circuit 116
To obtain a timing signal indicating the upper and lower mask portions of the letterbox system. The signal reproducing circuit 117 reproduces a clock signal or the like during the period of the upper and lower mask portions by this timing signal, and outputs it to the signal processing circuit 113. The signal processing circuit 113 uses the output signal of the signal reproduction circuit 117 as a master clock when performing digital processing, for example, on the multiplexed signal demodulated by the synchronous detection circuit 112, and performs decoding processing, error correction processing, waveform processing, and the like. Various signal processing such as conversion processing is performed, and the multiplexed signal after the signal processing is output to the multiplexed signal output terminal 114.

The embodiment of FIG. 1 has an effect that the operation of the signal processing circuit 113 using the clock signal can be performed stably.

FIG. 2 shows an embodiment of the signal reproducing circuit 117.

The same reference numerals as those in FIG.
Is a burst extraction circuit, 202 is a phase comparison circuit, and 203,
206 is a switch circuit, 204 and 205 are low-pass filters (hereinafter abbreviated as LPF), 207 is a voltage-controlled oscillator (hereinafter abbreviated as VCO), 208 is a frequency divider, 209 is a video signal input terminal, and 210 is a mask timing. An input terminal 211 is a clock signal output terminal. Phase comparison circuit 202, LPF 204 or LPF 205, VCO2
07, a frequency dividing circuit 208 constitutes a PLL circuit, and reproduces a chrominance subcarrier from the burst signal extracted by the burst extracting circuit 201. The VCO 207 oscillates at a frequency, for example, four times the frequency of the chrominance subcarrier, and divides the frequency by four in the frequency divider 208 and returns it to the phase comparator 202. At this time, the output of the mask portion detection circuit 116 is used to switch the switch circuits 203, 20.
6 is controlled to switch the LPFs 204 and 205 between the mask part and the display part of the letterbox system, and to obtain the optimum loop characteristics in each of them.

As described above, if the output of the VCO 207 is used as a clock signal, the clock signal can be stably reproduced.

Another embodiment of the signal processing circuit 117 is shown in FIG.

1 and 2 denote the same functions.
301 is a sample and hold circuit (hereinafter abbreviated as S / H), and 302 is a low-pass filter (hereinafter abbreviated as LPF).
It is.

In the mask portion, since the degree of modulation of the video signal is low, the influence of a ghost or a change in the video signal is small. Therefore, in the embodiment of FIG. 3, since only the mask portion is extracted by the S / H 301 using the output of the mask portion detection circuit 116 and the PLL loop is formed, the clock signal can be stably reproduced. There is an effect that can be done.

FIG. 5 is a block diagram showing a transmission signal reproducing apparatus according to another embodiment of the present invention. 1 denote the same functions, and 501 denotes a synchronization detection circuit. In the embodiment shown in FIG. 5, the synchronization detection operation of the synchronization detection circuit 501 is performed only in the upper and lower mask portions.

FIG. 6 shows an embodiment of the synchronization detecting circuit 501. 5 denote the same functions, 601 denotes a synchronization separation circuit, 602 denotes a phase comparison circuit, 603 and 606 denote switch circuits, and 604 and 605 denote low-pass filters (hereinafter L).
607), a voltage controlled oscillator (hereinafter abbreviated as VCO), 608 is a video signal input terminal, 609 is a mask portion timing input terminal, and 610 is a synchronization signal output terminal.

A phase comparator 602, LPF 604 or LPF 605, and VCO 607 constitute a PLL circuit, and reproduces a horizontal synchronizing signal from the composite sync separated by the sync separator 601. At this time, the output of the mask portion detection circuit 116 is used to
The LPFs 604 and 605 are switched between the mask portion and the display portion of the letterbox system by controlling the LPFs 606 and 606, respectively, so as to obtain the optimum loop characteristics.

Thus, there is an effect that the horizontal synchronizing signal can be demodulated stably.

Another embodiment of the synchronization detecting circuit 501 is shown in FIG. The same reference numerals as those in FIGS.
Denotes a sample and hold circuit (hereinafter abbreviated as S / H), 70
Reference numeral 2 denotes a low-pass filter (hereinafter abbreviated as LPF).

Since the degree of modulation of the video signal is low in the mask portion, ghosts and changes in the video signal are less affected. Therefore, in the embodiment of FIG. 7, since information of only the mask portion is extracted by the S / H 701 using the output of the mask portion detection circuit 116 to form a PLL loop, the horizontal synchronization signal can be stably demodulated. There is an effect that can be.

FIG. 8 is a block diagram showing a transmission signal reproducing apparatus according to another embodiment of the present invention. 1 and 5 denote the same functions, and 801 denotes a signal processing circuit. In the embodiment of FIG. 8, not only the output signal of the signal reproducing circuit 117 but also the
The signal processing operation of the signal processing circuit 801 is performed using the output signal of the synchronization detection circuit 501. The output signal of the signal reproduction circuit 117 is used as a master clock for performing digital processing, for example, and the output signal of the synchronization detection circuit 501 is used as a timing signal for signal processing synchronized with the horizontal scanning period, for example. , Extraction of a specific horizontal scanning period and switching of processing, decoding processing, error correction processing,
Various signal processing such as waveform equalization processing is performed, and the multiplexed signal after signal processing is output to the multiplexed signal output terminal 114.

In the embodiment shown in FIG. 8, there is an effect that the operation of the signal processing circuit 801 using the clock signal and the synchronization signal can be performed stably.

FIG. 9 is a block diagram showing a transmission signal reproducing apparatus according to another embodiment of the present invention. 1 and 5 denote the same functions, and 901 denotes a signal processing circuit. In the embodiment of FIG. 9, the demodulated video signal output from the video detection circuit 107 and the multiplexed signal demodulated by the synchronous detection circuit 112 are input to the signal processing circuit 901. As in the case of FIG. 8, the signal processing circuit 901 receives the output signal of the signal reproduction circuit 117 and the output signal of the synchronization detection circuit 501, and performs signal processing such as crosstalk elimination and ghost elimination. A video signal after signal processing and a multiplexed signal are output to a terminal 110 and a multiplexed signal output terminal 114, respectively.

In the embodiment shown in FIG. 9, there is an effect that the operation of the signal processing circuit 901 using the clock signal and the synchronization signal can be performed stably.

FIG. 10 is a block diagram showing a transmission signal reproducing apparatus according to another embodiment of the present invention. 1, 5, and 9 indicate the same functions, and 1001 indicates a multiplication circuit.
2, a carrier recovery circuit; 1003, a low-pass filter (hereinafter abbreviated as LPF); a multiplication circuit 1001, a carrier recovery circuit 1002, and a LPF 1003;
Constituting No. 2.

In the embodiment shown in FIG. 10, the carrier recovery operation of the carrier recovery circuit 1002 constituting the synchronous detection circuit 112 is performed only in the upper and lower mask portions.

One embodiment of the carrier recovery circuit 1002 is shown in FIG.
It is shown in FIG. The same reference numerals as those in FIG.
1 is an orthogonal intermediate frequency (hereinafter abbreviated as orthogonal IF) signal input terminal, 1102 is a mask portion timing input terminal, 11
03 and 1106 are switch circuits, 1104 and 1105 are low-pass filters (hereinafter abbreviated as LPF), 1107 is a voltage controlled oscillator (hereinafter abbreviated as VCO), and 1108 is a carrier output terminal.

A PLL circuit is composed of the multiplying circuit 1001, LPF 1104 or LPF 1105, and VCO 1107, and reproduces a carrier from a quadrature IF signal. At this time,
The switch circuits 1103 and 1106 are controlled using the output of the mask part detection circuit 116 to switch the LPFs 1104 and 1105 between the mask part and the display part of the letterbox method, and to achieve the optimum loop characteristics in each of them. Note that the multiplying circuit 1001 also serves as a synchronous detection operation for demodulating a multiplex signal.

Thus, there is an effect that the carrier can be stably reproduced with a simple configuration.

FIG. 12 shows another embodiment of the carrier recovery circuit 1002. 10 and 11 denote the same functions, 1201 denotes a sample and hold circuit (hereinafter abbreviated as S / H), and 1202 denotes a low-pass filter (hereinafter abbreviated as LPF).

Since the degree of modulation of the video signal is low in the mask portion, ghosts and changes in the video signal are less affected. Therefore, in the embodiment of FIG.
Since the information of only the mask portion is extracted by the S / H 1201 using the output of (1) and the PLL loop is configured, there is an effect that the carrier can be stably reproduced.

FIG. 13 is a block diagram showing a transmission signal reproducing apparatus according to another embodiment of the present invention. 1, 5, 9, and 10 indicate the same functions, and 1301 forms a carrier recovery circuit. The embodiment shown in FIG.
The carrier recovery operation of the carrier recovery circuit 1301 of the second embodiment is performed only in the upper and lower mask portions.

One embodiment of the carrier recovery circuit 1301 is shown in FIG.
It is shown in FIG. 11 and 13 denote the same functions, and 1401 denotes a phase comparison circuit. Phase comparison circuit 14
01, LPF1104 or LPF1105, VCO1
A PLL circuit is configured at 107 and reproduces a carrier from the orthogonal IF signal. At this time, the mask portion detection circuit 116
The switch circuits 1103 and 1106 are controlled by using the output of L and L in the mask portion and the display portion of the letter box system.
The PFs 1104 and 1105 are switched so that the respective loop characteristics are optimized.

Compared with the embodiment of FIG. 11, the phase comparison circuit 1401 of the PLL circuit for carrier wave reproduction can be dedicated, so that there is an effect that the carrier wave can be accurately and stably reproduced.

FIG. 15 shows another embodiment of the carrier recovery circuit 1301. 11, 12, 13 and 14 have the same functions. Since the degree of modulation of the video signal is low in the mask portion, ghosts and changes in the video signal are less affected. Therefore, in the embodiment of FIG. 12, the information of only the mask portion is extracted by the S / H 1201 using the output of the mask portion detection circuit 116 to form a PLL loop, and the phase comparison of the carrier wave recovery PLL circuit is performed. Circuit 14
Since 01 can be dedicated, there is an effect that the carrier can be accurately and stably reproduced.

FIG. 16 is a block diagram showing a transmission signal reproducing apparatus according to another embodiment of the present invention. 1, 5, 9, and 10 denote the same functions, 1601 denotes a synchronous detection circuit, 1602 denotes a carrier recovery circuit, and the synchronous detection circuit 1601 and the carrier recovery circuit 1602 use the video detection circuit 10.
7 is constituted.

In the embodiment shown in FIG. 16, the carrier recovery operation of the carrier recovery circuit 1602 constituting the video detection circuit 107 is performed only in the upper and lower mask portions.

One embodiment of the carrier recovery circuit 1602 is shown in FIG.
FIG. The same reference numerals as those in FIG.
1 is an intermediate frequency (hereinafter abbreviated as IF) signal input terminal,
702 is a phase comparison circuit, 1703 and 1706 are switch circuits, 1704 and 1705 are low-pass filters (hereinafter L
PF), 1707 is a voltage controlled oscillator (hereinafter VCO)
, 1708 is a π / 2 phase shift circuit, 1709 is a mask portion timing input terminal, and 1710 is a carrier wave output terminal.

A PLL circuit is constituted by the phase comparison circuit 1702, LPF 1704 or LPF 1705, VCO 1707, and π / 2 phase shift circuit 1708, and reproduces a carrier from an IF signal. At this time, the switch circuits 1703 and 1706 are controlled using the output of the mask portion detection circuit 116, and the LP portion is switched between the letter box type mask portion and the display portion.
F1704 and F1705 are switched to make the loop characteristics optimal in each case.

Thus, there is an effect that the carrier can be stably reproduced.

Another embodiment of the carrier recovery circuit 1602 is shown in FIG. 16 and 17 indicate the same function, 1801 is a sample and hold circuit (hereinafter abbreviated as S / H), and 1802 is a low- pass filter (hereinafter abbreviated as LPF).

Since the degree of modulation of the video signal is low in the mask portion, ghosts and changes in the video signal are less affected. Therefore, in the embodiment of FIG.
Since the information of only the mask portion is extracted by the S / H 1801 using the output of (1) and the PLL loop is formed, there is an effect that the carrier can be stably reproduced.

[0054]

According to the present invention, (a) a quadrature carrier having a quadrature phase relationship with a video carrier is modulated by a multiplexed signal, and combined with a video carrier modulated by a video signal of a letterbox system or the like and transmitted. A quadrature modulation method, (b) a quadrature carrier having a quadrature phase relationship with a video carrier is modulated by a multiplex signal,
A quadrature modulation method that combines a letterbox method and a quadrature modulation method, such as a quadrature modulation method that combines and transmits a mask part multiplexed signal on the upper and lower mask parts with a video carrier modulated by a video signal multiplexed and transmitted In this case, attention is paid to the fact that crosstalk occurs between a video signal of the letter box system or the like and a multiplexed signal, and the following effects are obtained.

Utilizing the fact that the degree of modulation of the video signal is low in the upper and lower mask portions in the letterbox system, intermediate system, etc., a stable horizontal synchronizing signal or clock signal is reproduced, or a carrier wave is reproduced for synchronous detection. Etc. can be performed stably, so that multiplexing is less affected by ghosts and video signals.
Signal reproduction device and video signal processing device.
You.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific example of a signal reproduction circuit 117 in FIG.

FIG. 3 is a block diagram showing a specific example of a signal reproducing circuit 117 in FIG.

FIG. 4 is a schematic diagram of a letter box type screen.

FIG. 5 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

6 is a block diagram illustrating a specific example of a synchronization detection circuit 501 in FIG.

FIG. 7 is a block diagram showing a specific example of a synchronization detection circuit 501 in FIG.

FIG. 8 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

FIG. 9 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

FIG. 10 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

11 is a block diagram showing a specific example of a carrier recovery circuit 1002 in FIG.

12 is a block diagram showing a specific example of a carrier recovery circuit 1002 in FIG.

FIG. 13 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

14 is a block diagram showing a specific example of a carrier recovery circuit 1301 in FIG.

FIG. 15 is a block diagram showing a specific example of a carrier recovery circuit 1301 in FIG.

FIG. 16 is a block diagram of a transmission signal reproducing apparatus according to an embodiment of the present invention.

17 is a block diagram illustrating a specific example of a carrier recovery circuit 1602 in FIG.

FIG. 18 is a block diagram showing a specific example of a carrier recovery circuit 1602 in FIG.

[Explanation of symbols]

 Reference numeral 113: signal processing circuit, 115: synchronization detection circuit, 116: mask part detection circuit, 117: signal reproduction circuit, 201: burst extraction circuit, 202: phase comparison circuit, 203: switch circuit, 204: LPF, 205: LPF, 206: switch circuit, 207: VCO, 208: frequency divider circuit, 301: S / H, 501: synchronization detection circuit, 601: synchronization separation circuit, 602: phase comparison circuit, 603: switch circuit, 604: LPF, 605 ... LPF, 606: switch circuit, 607: VCO, 701: S / H, 801: signal processing circuit, 901: signal processing circuit, 1001: multiplication circuit, 1002: carrier wave reproduction circuit, 1103: switch circuit, 1104: LPF, 1105 ... LPF, 1106 switch circuit, 1107 VCO, 1201 S / H, 1301 carrier recovery circuit, 1401 phase comparison circuit, 1602 carrier recovery circuit, 1702 phase comparison circuit, 1703 switch circuit, 1704 LPF, 1705 LPF, 1706 switch circuit, 1707 VCO, 1708 ... Π / 2 phase shift circuit, 1801.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Masahiro Kageyama, Norihiro Suzuki, Kazuo Ishikura, Takahiko Fukinuki "A Study on Scanning Line Conversion in Letterbox Wide TV", Television Society Technical Report, January 1990 30th, Vol. 14, No. 8, pp. 31-36 (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N ^7/ 025-7/088 H04J 11/00

Claims (10)

(57) [Claims] A left sideband amplitude-modulated wide aspect image is displayed on the left and right sides to fill a 4: 3 aspect screen, and is orthogonal to a video carrier of a video signal serving as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing apparatus for receiving and reproducing a transmission signal in which another signal is multiplexed and transmitted by a carrier wave, and outputs another multiplexed transmission signal by detecting the received transmission signal with the orthogonal carrier wave. Synchronous detection means, video signal demodulation means for outputting a video signal by detecting the received transmission signal with the video carrier, and displaying the display portion from the output signal of the video signal demodulation means.
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an output portion; and a negative-feedback type video signal processing means for reproducing a horizontal synchronizing signal from the output signal of the video signal demodulating means. A phase error signal is input to the negative feedback loop, and a response characteristic variable low-pass filter means for determining a response characteristic of the phase negative feedback loop is used, and the timing signal as an output signal of the detection means is used.
And a response characteristic of the response characteristic variable low-pass filter means.
The first response characteristic except for the first detection part.
In the first detection part, the response is compared with the first response characteristic.
A second response characteristic having a slow characteristic, or the second response characteristic
The first response characteristic is set as the first response characteristic in the detection part of
Outside, the second response characteristic is slower than the first response characteristic.
And a switching means for setting the response characteristics of the multiplexed signal. 2. The left and right sides of a wide aspect image subjected to vestigial sideband amplitude modulation are displayed in a full 4: 3 aspect screen, and are orthogonal to the video carrier of the video signal as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing apparatus for receiving and reproducing a transmission signal in which another signal is multiplexed and transmitted by a carrier wave, and outputs another multiplexed transmission signal by detecting the received transmission signal with the orthogonal carrier wave. Synchronous detection means, video signal demodulation means for outputting a video signal by detecting the received transmission signal with the video carrier, and displaying the display portion from the output signal of the video signal demodulation means.
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an output portion; and a negative-feedback type video signal processing means for reproducing a horizontal synchronizing signal from the output signal of the video signal demodulating means. A sample and hold unit to which a phase error signal is input and a timing signal which is an output signal of the detection unit are used in a negative feedback loop .
And the sample period of the sample and hold means is
Except for the first detection part, the hold period is set to the first detection part.
Or the sample period as the second detection.
The outgoing portion and the hold period are other than the second detection portion.
Multiplexed signal reproducing apparatus characterized by comprising: a control means. 3. The left and right sides of a wide aspect image modulated with residual sideband amplitude modulation are fully displayed in a 4: 3 aspect screen, and are orthogonal to the video carrier of the video signal as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing apparatus for receiving and reproducing a transmission signal in which another signal is multiplexed and transmitted by a carrier wave, and outputs another multiplexed transmission signal by detecting the received transmission signal with the orthogonal carrier wave. Synchronous detection means, video signal demodulation means for outputting a video signal by detecting the received transmission signal with the video carrier, and displaying the display portion from the output signal of the video signal demodulation means.
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an output portion; and a video signal processing means of a phase negative feedback type for reproducing a clock signal synchronized with a video subcarrier from an output signal of the video signal demodulating means. A phase error signal is input to a phase negative feedback loop of the signal processing unit, and a response characteristic variable low-pass filter unit that determines a response characteristic of the phase negative feedback loop is used. The timing signal that is an output signal of the detection unit is used.
And a response characteristic of the response characteristic variable low-pass filter means.
The first response characteristic except for the first detection part.
In the first detection part, the response is compared with the first response characteristic.
A second response characteristic having a slow characteristic, or the second response characteristic
The first response characteristic is set as the first response characteristic in the detection part of
Outside, the second response characteristic is slower than the first response characteristic.
And a switching means for setting the response characteristics of the multiplexed signal. 4. The left and right sides of a wide-aspect image subjected to vestigial sideband amplitude modulation are displayed in a full 4: 3 aspect screen, and are orthogonal to the video carrier of the video signal as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing apparatus for receiving and reproducing a transmission signal in which another signal is multiplexed and transmitted by a carrier wave, and outputs another multiplexed transmission signal by detecting the received transmission signal with the orthogonal carrier wave. Synchronous detection means, video signal demodulation means for outputting a video signal by detecting the received transmission signal with the video carrier, and displaying the display portion from the output signal of the video signal demodulation means.
1 is detected as the detection portion or the upper mask
It detects the part or the lower mask portion as the second detection portion
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an output portion; and a video signal processing means of a phase negative feedback type for reproducing a clock signal synchronized with a video subcarrier from an output signal of the video signal demodulating means. A sample and hold unit to which a phase error signal is input and a timing signal which is an output signal of the detection unit are used in a phase negative feedback loop of the signal processing unit .
And the sample period of the sample and hold means is
Except for the first detection part, the hold period is set to the first detection part.
Or the sample period as the second detection.
The outgoing portion and the hold period are other than the second detection portion.
Multiplexed signal reproducing apparatus characterized by comprising: a control means. 5. The left and right sides of a residual sideband amplitude-modulated wide aspect image are displayed to fill a 4: 3 aspect screen, and are orthogonal to the video carrier of the video signal as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing device that receives and reproduces a transmission signal obtained by multiplexing and transmitting another signal with a carrier wave, a video signal demodulation unit that outputs a video signal by detecting the received transmission signal with the video carrier wave, From the output signal of the video signal demodulating means, the display portion is
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an outgoing part; multiplying means for multiplying the received transmission signal by a demodulated orthogonal carrier; removing unnecessary bands from an output signal of the multiplying means, and multiplexing another signal. Filter means for outputting, and an output signal of the multiplying means as a phase error signal,
A quadrature carrier regenerating means for reconstructing the demodulated quadrature carrier, which constitutes the multiplying means and a phase negative feedback loop, wherein the phase error signal is input to the quadrature carrier regenerating means, and a response of the phase negative feedback loop Response characteristic variable low-pass filter means for determining characteristics, and the timing signal which is an output signal of the detection means.
And a response characteristic of the response characteristic variable low-pass filter means.
The first response characteristic except for the first detection part.
In the first detection part, the response is compared with the first response characteristic.
A second response characteristic having a slow characteristic, or the second response characteristic
The first response characteristic is set as the first response characteristic in the detection part of
Outside, the second response characteristic is slower than the first response characteristic.
And a switching means for setting the response characteristics of the multiplexed signal. 6. The left and right sides of a wide aspect image modulated with residual sideband amplitude modulation are fully displayed in a 4: 3 aspect screen, and are orthogonal to a video carrier of a video signal serving as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing device that receives and reproduces a transmission signal obtained by multiplexing and transmitting another signal with a carrier wave, a video signal demodulation unit that outputs a video signal by detecting the received transmission signal with the video carrier wave, From the output signal of the video signal demodulating means, the display portion is
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an outgoing part; multiplying means for multiplying the received transmission signal by a demodulated orthogonal carrier; removing unnecessary bands from an output signal of the multiplying means, and multiplexing another signal. Filter means for outputting, and an output signal of the multiplying means, and a quadrature carrier regenerating means for reconstructing the demodulated quadrature carrier, which constitutes a phase negative feedback loop with the multiplying means. A sample and hold unit to which a phase error signal extracted from an output signal of the multiplication unit is input, and the timing signal which is an output signal of the detection unit.
And the sample period of the sample and hold means is
Except for the first detection part, the hold period is set to the first detection part.
Or the sample period as the second detection.
The outgoing portion and the hold period are other than the second detection portion.
Multiplexed signal reproducing apparatus characterized by comprising: a control means. 7. The left and right sides of a wide aspect image modulated with residual sideband amplitude modulation are fully displayed in a 4: 3 aspect screen, and are orthogonal to the video carrier of the video signal as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing device that receives and reproduces a transmission signal obtained by multiplexing and transmitting another signal with a carrier wave, a video signal demodulation unit that outputs a video signal by detecting the received transmission signal with the video carrier wave, From the output signal of the video signal demodulating means, the display portion is
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an outgoing portion; synchronous detection means for outputting another signal multiplexed by detecting the received transmission signal with a demodulated quadrature carrier; and Phase-negative-feedback type quadrature carrier recovery means for reproducing the demodulated quadrature carrier phase-synchronized with the orthogonal carrier wave, wherein a phase error signal is input to a phase negative feedback loop of the quadrature carrier recovery means, Response characteristic variable low-pass filter means for determining the response characteristic of the feedback loop, and the timing signal which is an output signal of the detection means.
And a response characteristic of the response characteristic variable low-pass filter means.
The first response characteristic except for the first detection part.
In the first detection part, the response is compared with the first response characteristic.
A second response characteristic having a slow characteristic, or the second response characteristic
The first response characteristic is set as the first response characteristic in the detection part of
Outside, the second response characteristic is slower than the first response characteristic.
And a switching means for setting the response characteristics of the multiplexed signal. 8. The left and right sides of a wide aspect image subjected to vestigial sideband amplitude modulation are fully displayed in a 4: 3 aspect screen, and are orthogonal to a video carrier of a video signal serving as a display portion, an upper mask portion, and a lower mask portion. A multiplex signal reproducing device that receives and reproduces a transmission signal obtained by multiplexing and transmitting another signal with a carrier wave, a video signal demodulation unit that outputs a video signal by detecting the received transmission signal with the video carrier wave, From the output signal of the video signal demodulating means, the display portion is
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an outgoing portion; synchronous detection means for outputting another signal multiplexed by detecting the received transmission signal with a demodulated quadrature carrier; and A phase negative feedback type quadrature carrier regenerating means for regenerating the demodulated quadrature carrier which is phase-synchronized with the orthogonal carrier, wherein the phase error signal is input to a phase negative feedback loop of the quadrature carrier regenerating means. Means, and the timing signal which is an output signal of the detection means is used.
And the sample period of the sample and hold means is
Except for the first detection part, the hold period is set to the first detection part.
Or the sample period as the second detection.
The outgoing portion and the hold period are other than the second detection portion.
Multiplexed signal reproducing apparatus characterized by comprising: a control means. 9. A video carrier wave is modulated by a video signal having a display portion, an upper mask portion, and a lower mask portion by displaying the left and right sides of a wide aspect image which has been subjected to residual sideband amplitude modulation to a 4: 3 aspect screen. A video signal processing apparatus for receiving and reproducing a transmitted signal transmitted by the apparatus, comprising: a video signal demodulating means for outputting a video signal by detecting a demodulated video carrier from the received transmission signal; and A phase negative feedback type video carrier reproducing means for reproducing the demodulated video carrier phase-synchronized with the video carrier ; and outputting the display portion from the output signal of the video signal demodulating means.
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an output portion , wherein a phase error signal is input to a phase negative feedback loop of the video carrier reproducing means, and a response characteristic variable low band which determines a response characteristic of the phase negative feedback loop. Using a pass filter means and the timing signal which is an output signal of the detection means.
And a response characteristic of the response characteristic variable low-pass filter means.
The first response characteristic except for the first detection part.
In the first detection part, the response is compared with the first response characteristic.
A second response characteristic having a slow characteristic, or the second response characteristic
The first response characteristic is set as the first response characteristic in the detection part of
Outside, the second response characteristic is slower than the first response characteristic.
And a switching means for setting a response characteristic of the video signal. 10. A video carrier wave is modulated by a video signal having a display portion, an upper mask portion, and a lower mask portion by displaying the left and right sides of a wide aspect image which has been subjected to residual sideband amplitude modulation to a 4: 3 aspect screen. A video signal processing apparatus for receiving and reproducing a transmitted signal transmitted by the apparatus, comprising: a video signal demodulating means for outputting a video signal by detecting a demodulated video carrier from the received transmission signal; and A phase negative feedback type video carrier reproducing means for reproducing the demodulated video carrier phase-synchronized with the video carrier ; and outputting the display portion from the output signal of the video signal demodulating means.
1 is detected as the detection portion or the upper mask
Part or the lower mask part as a second detection part.
The first detection portion or the second detection
Detecting means for outputting a timing signal indicating an output portion; a sample and hold means for inputting a phase error signal to a phase negative feedback loop of the video carrier reproducing means; and an output signal of the detecting means. Use timing signal
And the sample period of the sample and hold means is
Except for the first detection part, the hold period is set to the first detection part.
Or the sample period as the second detection.
The outgoing portion and the hold period are other than the second detection portion.
A video signal processing apparatus characterized by comprising: a control means.