JPH11112951A - Image signal transmitter and receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive image transmitter and receiver by converting a format of the second parallel digital image signal into the first parallel digital image signal and multiplexing the second parallel digital image signal format- converted during a digital blanking period of the first parallel digital image signal. SOLUTION: For a total of 30 bits of a HDTV digital YPbPr signal outputted from a digital HDTVYPbPr signal source 100, a HDGTV digital Pb signal 10 bits and a Pr signal 10 bits applies a two-time division multiplexing and is converted in to a signal of HDTV digital YPbPr signal total of 20 bits in a PbPr time division multiplexing means 101. An input of a format conversion means 103 is an NTSC digital signal of 14.3 MHz 10-bit parallel nonperiodically and outputs an HDTV digital signal of parallel of 20-bit unit of 74.25/1.001 MHz.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal transmitting apparatus and an image signal receiving apparatus for serializing and transmitting a parallel digital image signal, and more particularly to a first parallel digital image signal, for example, an HDTV (high definition) parallel digital image. The present invention relates to an image signal transmitting apparatus and an image signal receiving apparatus which transmit a signal and a second parallel digital image signal, for example, image signals of different formats such as an NTSC parallel digital image signal, through a single image signal transmission line.

[0002]

2. Description of the Related Art Hitherto, as this type of image signal transmitting apparatus and image signal receiving apparatus, there have been those shown in FIGS. Figure 5 shows HDTV parallel digital YPbP
FIG. 6 is a block diagram showing an example of a conventional serial digital image signal transmitting apparatus for converting an r signal into a serial digital signal and transmitting the signal. FIG. 6 shows a serial digital signal transmitted from the image signal transmitting apparatus shown in FIG. FIG. 11 is a block diagram showing an example of a serial digital image signal receiving device that receives and converts it into a conventional HDTV parallel digital YPbPr signal.

First, a configuration of the above-described conventional image signal transmitting apparatus will be described with reference to FIG. In FIG. 5, 4
00 has a sampling frequency of 74.25 / 1.001MH
z 10-bit HDTV digital Y signal and HDTV with a sampling frequency of 37.125 / 1.001 MHz
A digital HDTVYPbPr signal source having 10 bits of a digital Pb signal and a 10-bit HDTV digital Pr signal having a sampling frequency of 37.125 / 1.001 MHz, and 401 is a digital HDTVYPbPr signal source 4
PbPr time-division multiplexing means for time-division multiplexing the HDTV digital Pb signal and the HDTV digital Pr signal out of the 30-bit output signal 00 to convert it to 20 bits of the HDTV digital YPbPr signal having a sampling frequency of 74.25 / 1.001 MHz. is there.

[0004] Reference numeral 402 denotes a PbPr time division multiplexing means 4.
A parallel / serial conversion means (abbreviated as P / S conversion means) for serializing a parallel output 20-bit signal of No. 01 and converting it to a serial digital electric signal of about 1.5 Gbps, 403 denotes a serial output of the parallel / serial conversion means 402 This is an electric / optical signal converting means (abbreviated as E / O converting means) which converts a digital electric signal into an optical signal and outputs the optical signal from the image signal transmitting apparatus.

Next, a configuration of the conventional image signal receiving apparatus will be described with reference to FIG. In FIG. 6, 5
Reference numeral 00 denotes an optical / electrical signal converting means (abbreviated as O / E converting means) for converting an optical signal input to the image signal receiving apparatus shown in FIG. 6 into a serial digital electric signal of about 1.5 Gbps, and 501 denotes an optical / electrical signal. Serial / parallel conversion means (abbreviated as S / P conversion means) for converting a serial digital electric signal output from the electric signal conversion means 500 into a 20-bit HDTV digital YPbPr signal having a sampling frequency of 74.25 / 1.001 MHz; Reference numeral 502 denotes a 20-bit output YP of the serial / parallel conversion means 501.
PbPr separation means for converting the bPr signal into a 30-bit YPbPr signal by time-division separation of the PbPr signal, and 503 a digital HDTVYPbPr signal for outputting the output of the PbPr separation means 502 as an HDTV digital YPbPr signal output of the image signal receiving apparatus of FIG. Output.

Next, an operation of the conventional image signal receiving apparatus will be described with reference to FIG. In FIG. 5, an HD having a sampling frequency of 74.25 / 1.001 MHz is used.
A 10-bit TV digital Y signal, a 10-bit HDTV digital Pb signal having a sampling frequency of 37.125 / 1.001 MHz, and a sampling frequency of 37.125 / 1.001 MHz.
The 30-bit output signal of the digital HDTVYPbPr signal source 400, which is composed of 10 bits of the 125 / 1.001 MHz HDTV digital Pr signal, passes through the PbPr time-division multiplexing means 401 to output the HDTV digital Pb signal and the H signal.
The DTV digital Pr signal is time-division multiplexed and converted into a 20-bit YPbPr signal having a sampling frequency of 74.25 / 1.001 MHz.

The PbPr time division multiplexing means 401
The bit output signal is output from a parallel / serial converter (P / S
(Abbreviated as conversion means) 402 and serialized to about 1.
It is converted into a 5 Gbps serial digital signal. The serial digital signal, which is an electric signal, is converted into an optical signal through an electric / optical signal converting means (abbreviated as E / O converting means) 403, and is output from the image signal transmitting apparatus of FIG.

The operation of the conventional image signal receiving apparatus will be described with reference to FIG. The optical signal input to the receiving apparatus of FIG. 6 is converted into a serial digital signal of about 1.5 Gbps by an optical / electrical signal converter (abbreviated as O / E converter) 500. The serial digital signal output from the optical / electrical signal conversion means 500 is a serial / digital signal.
Parallel conversion means (abbreviated as S / P conversion means) 501
Sampling frequency 74.25 / 1.001MH
z is converted to a 20-bit HDTV digital YPbPr signal.

The serial / parallel conversion means 501
The bit output HDTV digital YPbPr signal is
The PbPr signal is time-division separated by the bPr
It is converted to a 0-bit HDTV digital YPbPr signal. The output of the PbPr separation means 502 is the digital HDTVYPbPr signal output 503 as the HDTV digital YPbPr signal output of the image signal receiving apparatus of FIG.
Output from

[0010]

The above-mentioned conventional first parallel digital image signal, for example, an HDTV digital Y having a sampling frequency of 74.25 / 1.001 MHz.
In a serial digital image signal transmitting device and a serial digital image signal receiving device for transmitting and receiving a PbPr signal, a second parallel digital image signal of a different format, for example, an NTSC digital signal cannot be transmitted at the same time. Separate serial transmission means and serial reception means are required, resulting in high costs. In addition, it is necessary to prepare one or more transmission paths such as optical fibers separately. Was expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has a serial digital image signal transmitting device and a serial digital image signal receiving device for transmitting and receiving a first parallel digital image signal. Inexpensive image signal transmitting apparatus and image signal receiving apparatus capable of simultaneously transmitting and receiving second parallel digital image signals of other different formats without providing separate systems of serial transmitting means and serial receiving means. The purpose is to do.

[0012]

In order to solve the above-mentioned conventional problems, an image signal transmitting apparatus according to the present invention converts a format of a second parallel digital image signal into a format of a first parallel digital image signal. Converting means for converting the format of the first parallel digital image signal into a digital blanking period (digital line blanking period, digital field blanking period, or digital line blanking period and digital field blanking period); Multiplexing means for multiplexing parallel digital image signals.

The first parallel digital image signal is multiplexed during the digital blanking period of the first parallel digital image signal and the second parallel digital image signal is transmitted. And a second parallel digital image signal having a format different from that of the first embodiment.

An image signal receiving apparatus according to the present invention solves the above-mentioned conventional problems by providing a digital blanking period (digital line blanking period, digital field blanking period, or digital line blanking period) of a first parallel digital image signal. Separating means for separating the second parallel digital image signal converted from the first parallel digital image signal format from the first parallel digital image signal format (the ranking period and the digital field blanking period); And a format conversion means for converting the format of the second parallel digital image signal into the original format of the second parallel digital image signal.

By simultaneously receiving the second parallel digital image signal multiplexed during the digital blanking period of the first parallel digital image signal, the first parallel digital image signal can be used by the first serial digital image signal receiving apparatus.
And a second parallel digital image signal having a different format can be received at the same time.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a first parallel digital image signal generating first parallel digital image signal.
A second parallel digital image signal source for generating a second parallel digital image signal having a format different from that of the first parallel digital image signal; Format conversion means for inputting and converting into the same format as the first parallel digital image signal, and a second parallel digital image signal whose format has been converted during the digital blanking period of the first parallel digital image signal And a parallel / serial conversion means for converting the multiplexed first parallel digital image signal into a serial digital signal. The two parallel digital image signals of mutually different formats are simultaneously converted into one.
It is designed to be transmitted by the transmission means of the system,
By transmitting the second parallel digital image signal multiplexed in the digital blanking period of the first parallel digital image signal, a format different from that of the first parallel digital image signal is transmitted through one serial digital image signal transmitting device. And the second parallel digital image signal can be transmitted at the same time.

According to a second aspect of the present invention, in the digital blanking period of the first parallel digital image signal, the number of samples per unit time is A, and one sample is B bits. Assuming that the total number of samples per unit time of the parallel digital image signal is D and one sample is E bits, (A × B) ≧ (D × E)
Is established, and the second parallel digital image signal can be multiplexed and transmitted without excess or shortage throughout the digital blanking period of the first parallel digital image signal.

According to a third aspect of the present invention, there is provided a first parallel digital image obtained by multiplexing a second parallel digital image signal obtained by converting a received serial digital signal into the same format as the first parallel digital image signal. Serial / parallel conversion means for converting into a signal,
Image signal separating means for separating the multiplexed second parallel digital image signal from the digital blanking period of the first parallel digital image signal; And a format conversion means for converting the parallel digital image signal into a second parallel digital image signal having a different format from the parallel digital image signal. And simultaneously receiving the second parallel digital image signals multiplexed during the digital blanking period of the first parallel digital image signal, thereby receiving one system of serial digital image signals. No. using equipment An effect that can receive the parallel digital image signal format different from the second parallel digital image signal at the same time of.

According to a fourth aspect of the present invention, in the digital blanking period of the first parallel digital image signal, the number of samples per unit time is A, one sample is B bits, and the second parallel digital image signal is B bits. Assuming that the total number of samples per unit time of the parallel digital image signal is D and one sample is E bits, (A × B) ≧ (D × E)
Is established, and the second parallel digital image signal is multiplexed, and the first parallel digital image signal can be received throughout the digital blanking period.

According to a fifth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 1250. Of the parallel digital image signal
This has the effect of being applicable to an image signal transmitting apparatus in which the number of scanning lines per frame is 1250.

The invention according to claim 6 of the present invention is such that the number of scanning lines per frame of the first parallel digital image signal is 1250. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal receiving apparatus in which the number of scanning lines per frame is 1250.

According to a seventh aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 1125. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal transmitting apparatus in which the number of scanning lines per frame is 1125.

According to an eighth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 1125. Of the parallel digital image signal
This has the effect of being applicable to an image signal receiving apparatus in which the number of scanning lines per frame is 1125.

According to a ninth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 750,
The present invention has an effect that it can be applied to an image signal transmitting apparatus in which the number of scanning lines per frame of the first parallel digital image signal is 750.

According to a tenth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 750. Of the parallel digital image signal
This has the effect of being applicable to an image signal receiving apparatus in which the number of scanning lines per frame is 750.

According to an eleventh aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 625. Of the parallel digital image signal
This has the effect of being applicable to an image signal transmitting apparatus in which the number of scanning lines per frame is 625.

According to a twelfth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 625. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal receiving apparatus in which the number of scanning lines per frame is 625.

According to a thirteenth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 525. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal transmitting apparatus in which the number of scanning lines per frame is 525.

According to a fourteenth aspect of the present invention, the number of scanning lines per frame of the first parallel digital image signal is 525. Of the parallel digital image signal
This has the effect of being applicable to an image signal receiving apparatus in which the number of scanning lines per frame is 525.

According to a fifteenth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 1250. Of the parallel digital image signal
This has the effect of being applicable to an image signal transmitting apparatus in which the number of scanning lines per frame is 1250.

According to a sixteenth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 1250. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal receiving apparatus in which the number of scanning lines per frame is 1250.

According to a seventeenth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 1125. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal transmitting apparatus in which the number of scanning lines per frame is 1125.

According to an eighteenth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 1125. Of the parallel digital image signal
This has the effect of being applicable to an image signal receiving apparatus in which the number of scanning lines per frame is 1125.

According to a nineteenth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 750. Of the parallel digital image signal
This has the effect of being applicable to an image signal transmitting apparatus in which the number of scanning lines per frame is 750.

According to a twentieth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 750. Of the parallel digital image signal
This has the effect of being applicable to an image signal receiving apparatus in which the number of scanning lines per frame is 750.

According to a twenty-first aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 625. Of the parallel digital image signal
This has the effect of being applicable to an image signal transmitting apparatus in which the number of scanning lines per frame is 625.

According to a twenty-second aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 625. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal receiving apparatus in which the number of scanning lines per frame is 625.

According to a twenty-third aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 525. Of the parallel digital image signal
This has an effect that the present invention can be applied to an image signal transmitting apparatus in which the number of scanning lines per frame is 525.

According to a twenty-fourth aspect of the present invention, the number of scanning lines per frame of the second parallel digital image signal is 525. Of the parallel digital image signal
This has the effect of being applicable to an image signal receiving apparatus in which the number of scanning lines per frame is 525.

According to a twenty-fifth aspect of the present invention, the first parallel digital image signal is a compressed image signal in which the number of samples per unit time is reduced by a compression means. The digital signal transmitted per hit can be reduced and transmitted.

According to a twenty-sixth aspect of the present invention, the first parallel digital image signal is a compressed image signal in which the number of samples per unit time is reduced by a compression means. The digital signal received per hit can be reduced and received.

According to a twenty-seventh aspect of the present invention, the second parallel digital image signal is a compressed image signal in which the number of samples per unit time is reduced by a compression means. The second parallel digital image signal multiplexed and transmitted during the digital blanking period of the parallel digital image signal can be reduced and transmitted.

According to a twenty-eighth aspect of the present invention, the second parallel digital image signal is a compressed image signal in which the number of samples per unit time is reduced by a compression means. The second parallel digital image signal multiplexed and received in the digital blanking period of the parallel digital image signal can be reduced and received.

According to a twenty-ninth aspect of the present invention, the digital blanking period of the first parallel digital image signal is a digital line blanking period, a digital field blanking period, or a digital line blanking period and a digital field blanking period. This is a blanking period, and the digital blanking of the first parallel digital image signal multiplexed for transmission is performed in accordance with the size of the second parallel digital image signal multiplexed on the first parallel digital image signal. The ranking period can be selected from a digital line blanking period, a digital field blanking period, or a digital line blanking period and a digital field blanking period.

According to a thirtieth aspect of the present invention, the digital blanking period of the first parallel digital image signal is a digital line blanking period, a digital field blanking period, or a digital line blanking period and a digital field blanking period. A blanking period, and a digital line blanking period of the received first parallel digital image signal according to the size of the second parallel digital image signal to be multiplexed on the first parallel digital image signal; The second parallel digital image signal can be separated from a digital field blanking period or a digital blanking period selected from a digital line blanking period and a digital field blanking period. Cormorant having an effect.

According to a thirty-first aspect of the present invention, there is provided the image signal transmitting apparatus according to the first aspect and the image signal receiving apparatus according to the third aspect. The first parallel digital image signal obtained by multiplexing the first parallel digital image signal during the digital blanking period is converted into a serial digital signal and transmitted through one transmission means. The signal is converted into a first parallel digital image signal obtained by multiplexing the second parallel digital image signal, and the second parallel digital image signal is separated from the first parallel digital image signal. Multiplexed during the digital blanking period of the first parallel digital image signal, Transmitting and receiving digital digital image signals, thereby simultaneously transmitting and receiving the first parallel digital image signal and a second parallel digital image signal having a different format through a single system of serial digital image signal transmitting device and image signal receiving device. Has the effect of being able to

According to the invention of claim 32 of the present invention, the first
Generating a second parallel digital image signal having a format different from that of the first parallel digital image signal, and converting the second parallel digital image signal into the first parallel digital image signal. And multiplexes the second parallel digital image signal whose format has been converted during the digital blanking period of the first parallel digital image signal, and multiplexes the multiplexed first parallel digital image signal. The method comprises the steps of converting into a serial digital signal, wherein two parallel digital image signals of mutually different formats are simultaneously transmitted by one transmission means, and the digital signal of the first parallel digital image signal is transmitted. Multiplex on the ranking period Transmitting the first parallel digital image signal and the second parallel digital image signal having a different format from the first serial digital image signal transmitting apparatus simultaneously. Having.

According to a thirty-third aspect of the present invention, a first parallel digital image is obtained by multiplexing a second parallel digital image signal obtained by converting a received serial digital signal into the same format as the first parallel digital image signal. And converting the multiplexed second parallel digital image signal from the digital blanking period of the first parallel digital image signal, and inputting the separated second parallel digital image signal to the first parallel digital image signal. And a step of converting the parallel digital image signal into a second parallel digital image signal having a different format from the parallel digital image signal. To receive at the same time By receiving the second parallel digital image signal multiplexed in the digital blanking period of the first parallel digital image signal at the same time,
This has the effect that the first parallel digital image signal and the second parallel digital image signal in a different format can be simultaneously received using one serial digital image signal receiving device.

The invention as set forth in claim 34 of the present invention is characterized in that:
Converting a second parallel digital image signal having a format different from that of the first parallel digital image signal into the same format as the first parallel digital image signal, during the digital blanking period of the first parallel digital image signal. A process of multiplexing the second parallel digital image signal whose format has been converted,
A process for converting the multiplexed first parallel digital image signal into a serial digital signal and transmitting the serial digital signal is a computer-readable recording medium storing a program for causing a computer to execute the process.
Multiplexed during the digital blanking period of the parallel digital image signal and transmits the second parallel digital image signal, so that the second parallel digital image signal is transmitted through one system of serial digital image signal transmitting device and has a format different from that of the first parallel digital image signal. There is an effect that a program capable of transmitting the two parallel digital image signals simultaneously can be stored in a recording medium and read by another computer.

According to a thirty-fifth aspect of the present invention, there is provided a first parallel digital multiplexing apparatus which receives a serial digital signal and multiplexes a second parallel digital image signal converted into the same format as the first parallel digital image signal. A process of converting into an image signal, a process of separating the multiplexed second parallel digital image signal from a digital blanking period of the first parallel digital image signal, and inputting the separated second parallel digital image signal. A process for converting the first parallel digital image signal into a second parallel digital image signal having a format different from that of the first parallel digital image signal is a computer-readable recording medium storing a program for causing a computer to execute the first parallel digital image signal. Digital block of parallel digital image signal Simultaneously receiving the second parallel digital image signal multiplexed during the linking period, the second parallel digital image having a format different from that of the first parallel digital image signal using one serial digital image signal receiving device. It has an effect that a program capable of simultaneously receiving a signal and a program can be stored in a recording medium and read by another computer.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings and FIGS. FIG. 1 is a block diagram illustrating a configuration of an image signal transmitting apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram illustrating a configuration of an image signal receiving apparatus according to an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing a format of an HDTV digital line used in the image signal transmitting device and the image signal receiving device shown in FIG. 4, and FIG. 4 shows digital line blanking and digital line blanking used in the image signal transmitting device and the image signal receiving device shown in FIGS. FIG. 3 is a diagram illustrating a format of one frame including digital field blanking.

First, the configuration of the image signal transmitting apparatus according to the embodiment of the present invention will be described with reference to FIG.
In this embodiment, an HDTV (high definition) digital YPbPr is used as the first parallel digital image signal.
An image signal is used, and an NTSC parallel digital signal, so-called D2, is used as the second parallel digital image signal.
Use format signal. Of course, any other type of image signal can be freely used as the first and second parallel digital image signals.

In FIG. 1, reference numeral 100 denotes a 10-bit HDTV digital Y signal having a sampling frequency of 74.25 / 1.001 MHz, and a sampling frequency of 37.12.
5 / 1.001MHz HDTV digital Pb signal 10
Bits and the sampling frequency is 37.125 / 1.0
A digital HDTVYPbPr signal source (including, for example, a camera or a video) as a first parallel digital image signal source that outputs a 10-bit 01 MHz HDTV digital Pr signal, and 101 is a digital HDTVY
Of the total 30 bits of the HDTV digital YPbPr signal output from the PbPr signal source 100, 10 bits of the HDTV digital Pb signal and 10 bits of the Pr signal are 2 bits.
PbPr time-division multiplexing means for performing time-division multiplexing and converting into a total of 20-bit HDTV digital YPbPr signal.

Reference numeral 102 denotes a sampling frequency.
Digital NTSC as a second parallel digital image signal source for outputting 10 bits of a 3 MHz NTSC signal
This NTSC signal is 910 samples / 1
Lines, 525 lines / frame (including the field blanking period), the total number of samples per frame is 477,750, and 103 is a digital NTSC
This is format conversion means for format-converting the 10-bit NTSC signal output from the signal source 102 into a 20-bit 74.25 / 1.001 MHz signal. In this embodiment, one frame is set as a unit time,
The unit time may be another time, for example, one field.

Reference numeral 104 denotes PbPr time division multiplexing means 1
20-bit HDTV digital Y output from 01
The 20-bit parallel NTSC digital signal (238, 238) output from the format conversion means 103 in the digital line blanking undefined word data (301,500 samples / 1 frame, which will be described later with reference to FIG. 3) in the format of the PbPr signal. 875 samples /
20 frames parallel HDTV by multiplexing 1 frame)
Image signal multiplexing means for outputting a digital signal.

Reference numeral 105 denotes a sampling frequency output from the image signal multiplexing means 104 of 74.25 / 1.001 MHz.
And a parallel / serial conversion means (abbreviated as P / S conversion means) having a conversion ratio of 20: 1 for converting a 20-bit parallel HDTV digital signal into a serial digital signal (electric signal) of about 1.5 Gbps. /
Electrical / optical signal converting means (abbreviated as E / O converting means) for converting a serial digital signal (electric signal) output from the serial converting means 105 to an optical signal of 1.5 Gbps.
The optical signal output from the electrical / optical signal conversion means 106 is a transmission signal transmitted from the image signal transmitting apparatus shown in FIG.

Next, the operation of the image signal transmitting apparatus according to the embodiment of the present invention will be described with reference to FIG.
The digital HDTVYPbPr signal source 100 includes a 10-bit HDTV digital Y signal having a sampling frequency of 74.25 / 1.001 MHz and a sampling frequency of 3 bits.
7.125 / 1.001 MHz HDTV digital Pb
10 bits of signal and sampling frequency of 37.125
/ 10 001 MHz 10-bit HDTV digital Pr signal.

Digital HDTVYPbPr signal source 10
A total of 30 bits of the HDTV digital YPbPr signal output from 0 are converted into 10 bits of the HDTV digital Pb signal and Pr by the PbPr time division multiplexing means 101.
The 10 bits of the signal are time-division multiplexed and converted to a total of 20 bits of the HDTV digital YPbPr signal.

Here, before continuing the description of the operation of the image signal transmitting apparatus shown in FIG. 1, referring to FIG. 3, the format of the 20-bit parallel HDTV digital signal output from PbPr time division multiplexing means 101 will be described. Will be described. The 20-bit parallel HDTV digital signal output from the PbPr time-division multiplexing means 101 is, for example, BTAS-002A “1125/60 HDTV”.
Video Signal Coding and Bit Parallel Interface Standard "
And BTAS-004A "1125/60 HDTV
It has digital line blanking as defined in "Bit Serial Interface Standard for Signals". As shown in FIG. 3, the digital line of the format of the HDTV digital signal has 2200 samples (in FIG. 3, T indicates the number of samples per line.
The same shall apply hereinafter), and a digital effective line (19
20 (T) and digital line blanking (280 samples (T)).

Further, in FIG. 3, the digital line blanking (280 samples) in the present embodiment is an EAV (End Active Video) of four samples.
o), two samples of line number data, two samples of error detection code data, and four samples of SAV (Sta
rt Active Video) and 268 samples of undefined word data. HD
Since the TV digital signal is 1125 lines / 1 frame (the entire period of one frame including the digital effective area and the digital field blanking period), the output of the PbPr time division multiplexing means 101 shown in FIG. The total number of undefined word samples per frame of the signal is 301,5
00 samples.

Referring to FIG. 4, the structure of a format of one frame including digital line blanking and digital field blanking used in the present embodiment will be described. The structure of one frame shown in FIG. 4 is basically the same as the structure of the format shown in FIG.
One frame is composed of two fields: a field for odd-numbered scanning (digital effective area shown at the top) and a field for even-numbered scanning (digital effective area shown at the bottom), and 192 per line between each digital effective area.
Zero sample digital field blanking is included. That is, digital blanking includes digital line blanking and digital field blanking, and either or both can be used. In the present embodiment, only digital line blanking is used.

Returning to the description of the operation of the image signal transmitting apparatus shown in FIG. 1, the digital NTSC signal source 102 shown in FIG. 1 outputs a 10-bit parallel NTSC digital signal having a sampling frequency of 14.3 MHz. This N
TSC digital signal is 910 samples / line, 5
The total number of samples per frame is 477,750 for 25 lines / frame (including the line and field blanking periods). Digital NTSC signal source 1
The 10-bit parallel NTSC digital signal output from 02 is sent to the format conversion means 103, where the format is converted to a 74.25 / 1.001 MHz 20-bit parallel NTSC digital signal.

The format conversion means 103 uses a memory. The input is performed at any time in units of 10.3 MHz at 10 bits, and the output is performed at 74.25 / 1.001 MHz in 20 bits, and a 20-bit parallel HDTV digital signal is output. , And is performed only at the timing of the digital line blanking period of the HDTV digital signal. The number of samples per frame of the NTSC digital signal output from the format converter 103 is 238,875 samples as described above. Therefore, the image signal multiplexing means 104 outputs the digital line blanking undefined word data (301,500 samples / l) of the 20-bit parallel HDTV digital signal output from the PbPr time division multiplexing means 101.
20-bit parallel NTSC digital signal (2
38,875 samples / frame)
20-bit parallel HD that multiplexes C digital signals
It outputs TV digital signals.

Here, the digital blanking period (digital line blanking period in the present embodiment) of the HDTV digital signal as the first parallel digital image signal is per unit time (one frame in the present embodiment). Is A (in the present embodiment,
Undefined word data sample count 268 x line count 112
5 = 301,500), one sample is B bits (10
), And the total number of samples per unit time of the NTSC digital signal as the second parallel digital image signal is D (in the present embodiment, the number of samples is 910).
X number of lines 525/2 = 238,875, a 10-bit unit is converted to a 20-bit unit, so it is halved)
If one sample is E bits (10 bits), (A ×
If the relationship of B) ≧ (D × E) holds, the NTSC digital signal can be sufficiently multiplexed in the digital line blanking period of the HDTV digital signal.

The sampling frequency output from the image signal multiplexing means 104 is 20.
The bit-parallel HDTV digital signal is input to a parallel / serial conversion means 105 having a conversion ratio of 20: 1, and is converted into a serial digital signal of about 1.5 Gbps. The serial digital signal (electric signal) output from the parallel / serial conversion means 105 is input to the electric / optical signal conversion means 106 and converted into a 1.5 Gbps optical signal. The optical signal output from the electric / optical signal conversion means 106 becomes a serial digital transmission signal transmitted from the image signal transmitting apparatus shown in FIG. 1, and is transmitted to one system of serial transmitting means (not shown) including an optical fiber cable and the like. Transmitted to the image signal receiving device via

The image signal transmitting apparatus according to the present embodiment shown in FIG. 1 inputs a multiplexed sampling frequency of 14.3 MHz 10-bit parallel NTSC digital signal to the format conversion means 103 as needed.
25 / 1.001 MHz is converted into 20-bit units, and the converted 20-bit parallel NTSC digital signal is converted into 2 bits.
The output is performed only at the timing of the digital line blanking period of the 0-bit parallel HDTV digital signal, and the image signal multiplexing means 104 multiplexes the NTSC digital signal output from the format conversion means 103 with the digital line blanking of the HDTV digital signal. This allows the HDTV digital YPbPr signal and the NTSC digital signal to be simultaneously transmitted as serial digital transmission signals to the image signal receiving device via one system of serial digital transmission means including an optical fiber cable or the like. did.

Next, the configuration of the image signal receiving apparatus according to the embodiment of the present invention will be described with reference to FIG.
2, reference numeral 200 denotes a 1.5 Gbps serial digital signal (electrical signal) converted from a 1.5 Gbps optical signal input to the image signal receiving apparatus according to the present embodiment shown in FIG.
An optical / electrical signal converting means (abbreviated as O / E converting means) 201 for converting the serial digital signal output from the optical / electrical signal converting means 200 into a sampling frequency of 74.25 / 1.001 MHz 20 bits Serial / parallel conversion means (abbreviated as S / P conversion means) having a conversion ratio of 1:20 for converting into a parallel HDTV digital signal.

Reference numeral 202 denotes a 20-bit parallel HDTV output from the serial / parallel conversion means 201.
A 20-bit parallel NTSC digital signal (238, 87) converted from a digital signal into a 20-bit format and multiplexed with digital line blanking of a 20-bit parallel HDTV digital signal.
5 samples / 1 frame) and NTS
20-bit parallel H from which C digital signal is separated
Image signal separating means for outputting the DTV digital YPbPr signal to the PbPr time division separating means 203.

Reference numeral 203 denotes a 10-bit parallel HDTV digital Pb signal obtained by converting the HDTV digital PbPr signal, which is time-division multiplexed into 10 bits into 20 bits, out of the 20-bit parallel HDTV digital YPbPr signal output from the image signal separating means 202. And a 10-bit parallel HDTV digital Pr signal for a total of 3
PbPr time-division separating means for outputting a 0-bit parallel HDTV digital YPbPr signal;
30-bit parallel HD output from time-division separating means 203
The TV digital YPbPr signal is converted to a digital signal H output as the output of the HDTV parallel digital YPbPr signal of the image signal receiving apparatus in the embodiment shown in FIG.
DTVYPbPr signal output.

Reference numeral 205 denotes an image signal separating means 202 in which the sampling frequency separated from the 20-bit parallel HDTV digital signal is 74.25 / 1.0.
A format conversion means 206 for converting a 01 MHz 20-bit parallel NTSC digital signal into a sampling frequency 14.3 MHz 10-bit parallel NTSC digital signal. Reference numeral 206 denotes a 10-bit parallel NTSC digital signal output from the format conversion means 205 in FIG. Of the image signal receiving apparatus according to the present embodiment shown in FIG.
This is a digital NTSC signal output which is output as an output of a 0-bit parallel NTSC digital signal.

Next, the operation of the image signal transmitting apparatus according to the embodiment of the present invention will be described with reference to FIG.
The image signal is transmitted from the image signal transmitting apparatus according to the present embodiment shown in FIG. 1 via a transmission system (not shown) including an optical fiber cable and the like, and is transmitted to the image signal receiving apparatus according to the present embodiment shown in FIG. The inputted 1.5 Gbps optical signal is converted into a 1.5 Gbps serial digital signal (electric signal) by the optical / electric signal conversion means 200. The serial digital signal output from the optical / electrical signal conversion means 200 is converted into a serial / parallel conversion means 2 having a conversion ratio of 1:20.
01, the sampling frequency is 74.25 / 1.
001 MHz is converted to a 20-bit parallel HDTV digital signal.

In the image signal separating means 202, the NTSC digital signal (238, 238) is converted into a 20-bit format and multiplexed on the digital line blanking of the 20-bit parallel HDTV digital signal.
(875 samples / 1 frame) output from the serial / parallel conversion means 201
It is separated from TV digital signals and NTSC
20-bit parallel HD with separated digital signals
The TV digital YPbPr signal is output to the PbPr time division separation means 203.

The 2 output from the image signal separating means 202
The 0-bit parallel HDTV digital YPbPr signal is obtained by dividing the HDTV digital PbPr signal, which has been time-division multiplexed into 10 bits by the PbPr time-division separating means 203, into a 10-bit parallel HDTV digital Pb signal and 1 bit.
30-bit parallel HDTV digital Y separated into 0-bit parallel HDTV digital Pr signal
The PbPr signal is output. The 30-bit parallel HDTV digital YPbPr signal output from the PbPr time-division separating means 203 is the HDTV digital YPbPr of the image signal receiving apparatus according to the present embodiment shown in FIG.
Digital HDTVYPbP as parallel signal output
The signal is output from the r signal output 204.

The sampling frequency of the 20-bit parallel NTSC digital signal separated from the 20-bit parallel HDTV digital signal by the image signal separating means 202 is converted to the sampling frequency 14.3 by the format conversion means 205.
MHz Converted to a 10-bit parallel NTSC digital signal. The 10-bit parallel NTSC digital signal output from the format conversion means 205 is
N of the image signal receiving apparatus according to the present embodiment shown in FIG.
The digital NTSC signal output 206 is output as a parallel output of the TSC digital signal.

In the image signal receiving apparatus according to the present embodiment shown in FIG. 2, the sampling frequency multiplexed on the digital line blanking of the 20-bit parallel HDTV digital signal is 74.25 / 1.001 MHz.
The 20-bit parallel NTSC digital signal is separated by the image signal separating means 202 and converted into a 10-bit parallel NTSC digital signal by the format conversion means 205 at a sampling frequency of 14.3 MHz, thereby outputting the HDTV digital YPb.
HDTV digital YPbPr using Pr signal serial receiving means (image signal receiving apparatus in the present embodiment)
The signal and the NTSC digital signal can be received simultaneously.

By combining the image signal transmitting apparatus and the image signal receiving apparatus according to the present embodiment, a first parallel digital image signal (HDTV (High Definition) digital YPbPr image signal) and a second parallel digital image signal (NTSC parallel image signal) are obtained. A digital signal) is combined to form a serial digital signal, and an image signal transmitting and receiving system configured to be transmitted through one transmission unit can be constructed.

In the above description, the first parallel digital image signal is an HDTV digital YPbPr image signal, and the second parallel digital image signal is an NTSC parallel digital image signal. An image signal in which the number of samples per unit time is reduced by using a compression means such as MPEG2 can be obtained. In any case, the same effect can be obtained.
Even when the digital blanking period is short, the second parallel digital image signal can be multiplexed there.

In the above embodiment, when the NTSC digital image signal is multiplexed with the HDTV digital YPbPr image signal and transmitted, the HDTV digital YPbPr image signal is transmitted.
Multiplexing is performed using only the digital line blanking period (or area) of the Pr image signal.
The multiplexing may be performed using only the digital field blanking period (or area) of the V digital YPbPr image signal, or may be performed using both the digital line and digital field blanking periods (or area). good.

In the present embodiment described above, the number of scanning lines per frame of the first parallel digital image signal is 1125, but
In addition, 1250 lines, 750 lines, 625 lines, and 525 lines may be used, and the number of scanning lines per frame of the second parallel digital image signal is 525 in this embodiment. However, other 1250
, 1125, 750, and 625 lines may be used.

Further, the image signal transmitting apparatus and the image signal receiving apparatus in the present embodiment described above may be realized by hardware or software, and in particular, each of the image signal transmitting apparatus and the image signal receiving apparatus The components (means) can be individually realized by hardware or software. In particular, when the processing of each unit in the image signal transmitting device or the image signal receiving device of the present embodiment is realized by a software program, the operation of each unit of the image signal transmitting device and the image signal receiving device in the present embodiment is performed. May be a program for executing the processing described in the description.

[0081]

The present invention is configured as described above, and in particular,
By multiplexing and transmitting and receiving a second parallel digital image signal of another different format during a digital blanking period of the first parallel digital image signal, a separate system of serial digital image signal transmitting and receiving apparatus Inexpensive image signal transmitting device and image signal receiving device capable of simultaneously transmitting and receiving another system of second parallel digital image signals using one system of serial digital image signal transmitting and receiving device without providing An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image signal transmitting apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an image signal receiving apparatus according to the embodiment of the present invention.

FIG. 3 is a diagram showing a format of an HDTV digital line used in the image signal transmitting device and the image signal receiving device shown in FIGS. 1 and 2;

FIG. 4 is a diagram showing a format of one frame including digital line blanking and digital field blanking used in the image signal transmitting device and the image signal receiving device shown in FIGS. 1 and 2;

FIG. 5 is a block diagram showing an example of a conventional serial digital image signal transmitting apparatus for converting an HDTV parallel digital YPbPr signal into a serial digital signal and transmitting the serial digital signal;

6 is a block diagram showing an example of a conventional serial digital image signal receiving apparatus for receiving a serial digital signal transmitted from the image signal transmitting apparatus shown in FIG. 5 and converting the serial digital signal into an HDTV parallel digital YPbPr signal.

[Explanation of symbols]

100, 400 Digital HDTVYPbPr signal source 101, 401 PbPr time division multiplexing means 102 Digital NTSC signal source 103, 205 Format conversion means 104 Image signal multiplexing means 105, 402 Parallel / serial conversion means 106, 403 Electric / optical signal conversion means 200, 500 optical / electrical signal conversion means 201, 501 serial / parallel conversion means 202 image signal separation means 204, 503 digital HDTVYPbPr signal output 206 digital NTSC signal output 203 PbPr time division separation means 502 PbPr separation means

Claims (35)

[Claims] A first parallel digital image signal source for generating a first parallel digital image signal;
A second parallel digital image signal source for generating a second parallel digital image signal having a format different from that of the first parallel digital image signal; and a first parallel digital image signal receiving the second parallel digital image signal. Format conversion means for converting into the same format as the first parallel digital image signal; image signal multiplexing means for multiplexing the second parallel digital image signal whose format has been converted during the digital blanking period of the first parallel digital image signal; And a parallel / serial conversion means for converting the first parallel digital image signal into a serial digital signal, wherein two parallel digital image signals in mutually different formats are simultaneously transmitted by one transmission means. Image signal transmission equipment . 2. A digital blanking period of the first parallel digital image signal, wherein the number of samples per unit time is A and one sample is B bits, and 2. The image signal transmitting apparatus according to claim 1, wherein, when the total number of samples is D and one sample is E bits, a relationship of (A × B) ≧ (D × E) is satisfied. 3. A first multiplexed second parallel digital image signal obtained by converting a received serial digital signal into the same format as the first parallel digital image signal.
Serial / parallel conversion means for converting the multiplexed second parallel digital image signal from a digital blanking period of the first parallel digital image signal; Format conversion means for receiving the converted second parallel digital image signal and converting it into a second parallel digital image signal having a format different from that of the first parallel digital image signal. An image signal receiving apparatus, wherein a serial digital signal in which image signals are multiplexed is simultaneously received via one system of receiving means. 4. The digital blanking period of the first parallel digital image signal is such that the number of samples per unit time is A, and one sample is B bits, and the number of samples per unit time is B bits. 4. The image signal receiving apparatus according to claim 3, wherein, when the total number of samples is D and one sample is E bits, a relationship of (A × B) ≧ (D × E) is satisfied. 5. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of the first parallel digital image signal is 1250. 6. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said first parallel digital image signal is 1250. 7. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said first parallel digital image signal is 1125. 8. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said first parallel digital image signal is 1125. 9. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said first parallel digital image signal is 750. 10. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said first parallel digital image signal is 750. 11. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said first parallel digital image signal is 625. 12. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said first parallel digital image signal is 625. 13. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said first parallel digital image signal is 525. 14. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said first parallel digital image signal is 525. 15. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said second parallel digital image signal is 1250. 16. An image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said second parallel digital image signal is 1250. 17. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said second parallel digital image signal is 1125. 18. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said second parallel digital image signal is 1125. 19. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said second parallel digital image signal is 750. 20. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said second parallel digital image signal is 750. 21. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said second parallel digital image signal is 625. 22. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said second parallel digital image signal is 625. 23. The image signal transmitting apparatus according to claim 1, wherein the number of scanning lines per frame of said second parallel digital image signal is 525. 24. The image signal receiving apparatus according to claim 3, wherein the number of scanning lines per frame of said second parallel digital image signal is 525. 25. The apparatus according to claim 1, wherein said first parallel digital image signal is a compressed image signal obtained by reducing the number of samples per unit time by a compression means.
The image signal transmitting apparatus according to 5, 7, 9, 11, or 13. 26. The apparatus according to claim 3, wherein said first parallel digital image signal is a compressed image signal obtained by reducing the number of samples per unit time by a compression means.
The image signal receiving apparatus according to 6, 8, 10, 12, or 14. 27. The apparatus according to claim 1, wherein said second parallel digital image signal is a compressed image signal obtained by reducing the number of samples per unit time by a compression means.
The image signal transmitting device according to 15, 17, 19, 21 or 23. 28. The apparatus according to claim 3, wherein said second parallel digital image signal is a compressed image signal obtained by reducing the number of samples per unit time by a compression means.
The image signal receiving device according to 16, 18, 20, 22, or 24. 29. The digital blanking period of the first parallel digital image signal is a digital line blanking period, a digital field blanking period, or a digital line blanking period and a digital field blanking period. Claims 1, 2, 5, 7, 9, 11, 13, 15, 1
The image signal transmitting device according to 7, 19, 21 or 23. 30. The digital blanking period of the first parallel digital image signal is a digital line blanking period, a digital field blanking period, or a digital line blanking period and a digital field blanking period. Claims 3, 4, 6, 8, 10, 12, 14, 16, 1
The image signal receiving device according to 8, 20, 22, or 24. 31. An image signal transmitting apparatus according to claim 1, wherein said image signal transmitting apparatus transmits said second parallel digital image signal in a digital blanking period. The first multiplexed
Is converted into a serial digital signal and transmitted through a single transmission means. In the image signal receiving device, the received serial digital signal is multiplexed with the second parallel digital image signal to form a first parallel digital image signal. Wherein the second parallel digital image signal is separated from the first parallel digital image signal. 32. A method for generating a first parallel digital image signal, generating a second parallel digital image signal having a format different from that of the first parallel digital image signal, and converting the second parallel digital image signal to the second parallel digital image signal. The first parallel digital image signal is converted into the same format as the first parallel digital image signal, and the format-converted second parallel digital image signal is multiplexed during the digital blanking period of the first parallel digital image signal. An image signal transmitting method comprising: converting one parallel digital image signal into a serial digital signal; and simultaneously transmitting two parallel digital image signals of mutually different formats by one transmission means. 33. A receiving serial digital signal, comprising:
The second parallel digital image signal converted into the same format as that of the first parallel digital image signal is converted into a multiplexed first parallel digital image signal, and the multiplexed second digital image signal is converted from the digital blanking period of the first parallel digital image signal. Separating the two parallel digital image signals and converting the separated second parallel digital image signal into a second parallel digital image signal having a format different from that of the first parallel digital image signal. An image signal receiving method, comprising: receiving serial digital signals obtained by multiplexing two parallel digital image signals of mutually different formats via a single system of receiving means at the same time. 34. A process for converting a second parallel digital image signal having a format different from that of the first parallel digital image signal into the same format as the first parallel digital image signal; Performing a process of multiplexing the second parallel digital image signal whose format has been converted during the digital blanking period and a process of converting the multiplexed first parallel digital image signal into a serial digital signal and transmitting the serial digital signal to a computer. A computer-readable recording medium on which a program for causing a computer to record is recorded. 35. Receiving a serial digital signal and
Converting a second parallel digital image signal, which has been converted into the same format as that of the first parallel digital image signal, into a multiplexed first parallel digital image signal; and performing the multiplexing from the digital blanking period of the first parallel digital image signal. A process of separating a second parallel digital image signal, a process of inputting the separated second parallel digital image signal, and converting the second parallel digital image signal into a second parallel digital image signal having a format different from that of the first parallel digital image signal; Computer-readable recording medium that stores a program for causing a computer to execute the program.