JP4112707B2 - Signal switching device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal switching device capable of switching between two systems of a 1125 line system serial digital signal and a 525 line system serial digital signal.
[0002]
[Prior art]
In a general broadcasting system, both 1125-line television broadcasting and 525-line television broadcasting are possible. By the way, in recent years, digital signal processing technology has advanced remarkably, and accordingly, development of a broadcasting system has been actively carried out toward the start of digital broadcasting. When digital broadcasting is started, 1125-line television / 525-line television mixed broadcasting is possible.
[0003]
Therefore, as a broadcasting system, 1125 line system television broadcast and 525 line system television broadcast were separately processed using dedicated crosspoint devices, but one crosspoint device was used. In addition, there is a demand for a system that performs signal switching in accordance with 1125-line television broadcasting and 525-line television broadcasting.
[0004]
However, the frequency of the 1125-line serial digital signal by the 1125-line television broadcast is 1.5 GHz, and therefore, the crosspoint device must be provided with a reclocker or the like. Then, the cross point device becomes very expensive, and further, there arises a disadvantage that the power consumption increases. In addition, the 1.5 GHz electrical cross point device requires special work even when manufactured.
[0005]
[Problems to be solved by the invention]
As described above, in the broadcasting system, having a crosspoint device separately for the 1125 line system and the 525 line system increases the equipment cost, and the crosspoint device for the 1125 line system consumes power. It has the disadvantage of becoming larger.
[0006]
It is an object of the present invention to provide a signal switching processing device that can share a crosspoint device between a 1125-line serial digital signal and a 525-line serial digital signal, thereby reducing the cost and power consumption of the device. is there.
[0007]
[Means for Solving the Problems]
The present invention provides a 1125-line serial digital signal in which a plurality of parallel digital data having a fixed number of bits is arranged in series, and has a lower frequency than the 1125-line serial digital signal. The present invention is intended for a signal switching device that switches between a 525-line serial digital signal in which a plurality of parallel digital data having the number of bits is arranged in series.
[0008]
In order to achieve the above object, the same number of output terminals as the number of bits in the unit parallel digital data of the 1125 line system serial digital signal are provided, and the 1125 line system serial digital signal is input to the unit parallel digital data. First signal converting means for time-dividing a plurality of bits of data and converting the time-divided plurality of bits into a first parallel digital signal by simultaneously outputting the data strings from the output terminals corresponding to the number of bits. And the first parallel digital signal output by the first signal conversion means is time-divided into component block sequences that are different from each other, and the time-division component block sequence is serialized for each component block. After the conversion, the second signal conversion to be converted into the second parallel digital signal by simultaneously outputting each component separately. And a cross-point portion capable of switching signals at a frequency specified by at least the 525 line system serial digital signal, and is output from the second signal conversion means when the 1125 line system serial digital signal is input. A signal for switching the second parallel digital signal to be output through the cross-point portion and to output the 525-line serial digital signal through the cross-point portion when the 525-line serial digital signal is input. Switching means.
[0009]
According to this configuration, for a 1125 line system serial digital signal, a plurality of bits of data in the unit parallel digital data are time-divided and converted into a first parallel digital signal. The digital signal is time-divided into component block sequences that are different from each other, serialized for each component block with respect to this time-division component block sequence, and then output simultaneously for each component. 2 parallel digital signals.
[0010]
As a result, a single parallel point signal that can be switched at the frequency specified by the 525 line type serial digital signal is used, and the second parallel digital signal is passed through the cross point part when a 1125 line type serial digital signal is input. This cross-point portion can be shared by the 1125-line serial digital signal and the 525-line serial digital signal, and signal switching is facilitated. In addition, if the cross-point part is manufactured so as to operate in the vicinity of the frequency specified by the 525 line type 525/60 component or 4fsc composite serial digital signal, it can be manufactured using a conventional inexpensive device. It is possible to reduce the price and power consumption.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, an operation for performing signal conversion on an 1125-line serial digital signal according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a circuit configuration of a separation apparatus that performs signal conversion, and FIG. 2 shows signal timings indicating signal conversion operations.
[0012]
That is, as shown in FIG. 2A, the 1125-line serial digital signal input to the input terminal 11 in FIG. 1 is divided into, for example, four component blocks of Pb, Yc, Pr, Yo in the time direction (in FIG. For example, 10 bits of data are arranged in series in each block. The 1125-line serial digital signal is supplied to an S / P (serial / parallel) converter 12 having an output end for 10 bits in the unit block.
[0013]
As shown in FIG. 2B, the S / P converter 12 time-divides 10-bit data in the unit block and arranges it in parallel on the input 1125-line serial digital signal. By simultaneously outputting 10-bit data from the 10-bit output terminals, the 10-bit data is converted into a parallel digital signal having a 1/10 frequency at the time of input. The frequency in this case is 150 MHz because the input frequency is 1.5 GHz.
[0014]
Further, the parallel digital signal is supplied to a separation circuit 13 having four output terminals. As shown in FIG. 2 (c), the separation circuit 13 time-divides the input parallel digital signal into four kinds of component blocks Pb, Yc, Pr, and Yo, and the time-divided four components. The block signal sequence is output simultaneously for each component. At this time, the frequency of each output signal is a frequency of 37 MHz, which is 1/40 of the input signal.
[0015]
The four signals Pb, Yc, Pr, Yo output from the separation circuit 13 are serialized for each component block by the P / S converter 14 to be converted again into a 370 MHz serial signal. It is taken out by the output unit 15 having a number of output terminals.
[0016]
FIG. 3 shows an example of the circuit configuration of a composite apparatus that derives a 1125-line serial digital signal and a 525-line serial digital signal according to an embodiment of the present invention.
[0017]
In FIG. 3, reference numeral 21 denotes an input unit having four input terminals, and Pb, Yc, Pr, which are component blocks constituting the 1125 line system serial digital signal when the 1125 line system serial digital signal is input. The Yo signal is supplied. These Pb, Yc, Pr and Yo signals are converted into parallel digital signals by the S / P converter 22, respectively. The plurality of parallel digital signals are converted into the 1125 line system format by the composite circuit 23, restored to the 1125 line system serial digital signal at the time of input by the P / S converter 24, and thereafter taken out from the output terminal 25.
[0018]
On the other hand, when a 525-line serial digital signal is input, the four 525-line serial digital signals input to the input unit 21 are converted into parallel digital signals by the S / P converter 22, respectively. The S converter 26 again returns the four 525-line serial digital signals to the output terminal 27.
[0019]
The P / S converter 24 forcibly outputs a 1125 line black signal to the output terminal 25 during the 525 line serial digital signal processing, and the P / S converter 26 outputs a 1125 line serial signal. During digital signal processing, a 525 line black signal is forcibly output to the output terminal 27.
[0020]
The 525-line serial digital signal has a frequency of 270 MHz when the aspect ratio is 4: 3, and a frequency of 360 MHz when the aspect ratio is 16: 9.
[0021]
FIG. 4 shows an embodiment of the present invention in which the separation apparatus of FIG. 1 and the composite apparatus of FIG. 3 are used to perform signal switching between a 1125-line serial digital signal and a 525-line serial digital signal. An example of the circuit configuration of the used signal switching device is shown.
[0022]
In FIG. 4, the 1125-line serial digital signal is input to the input unit 31. The input unit 31 has n input terminals 311 to 31n, and the n input terminals 311 to 31n are connected to n separators (331 to 33n) 33, respectively. Each of the n separation devices (331 to 33n) 33 has four output ends, and these four output ends are connected to the cross point device 34, respectively.
[0023]
The operation from the input unit 31 to the crosspoint device 34 will be described. The 1125-line serial digital signal input to the input unit 31 is equivalent to 10 bits in the unit parallel digital data by the separation device 33. The data is time-divided and converted into a parallel digital signal in which the 10-bit data is output simultaneously. The parallel digital signal is time-divided into four component block signal sequences Pb, Yc, Pr, Yo, and then serialized for each component block and supplied to the crosspoint device 34 for each component block. . Such an operation is performed on n 1125-line serial digital signals.
[0024]
Since the cross point device 34 is connected to the input unit 35 having 4n input terminals for inputting 4n 525 line type serial digital signals having different channels, the input terminal thereof is connected to the 1125 line type serial digital signal. The number of signals and the number of 525 line type serial digital signals are 5n, and the number of output terminals is 4n. The apparatus performs signal switching in the vicinity of the frequency of the 525 line type serial digital signals. It is. That is, the crosspoint device 34 simultaneously passes and outputs the signals Pb, Yc, Pr, and Yo output from the n separators (331 to 33n) 33 during the signal processing of the 1125-line serial digital signal. At the time of signal processing of the line system serial digital signal, switching is performed so that the 525 line system serial digital signal supplied from the input unit 35 is directly passed and output.
[0025]
Next, the output side of the cross point device 34 will be described.
The 4n output terminals of the cross point device 34 are connected to n composite devices (361 to 36n) 36, respectively. Each of these n composite devices (361 to 36n) 36 has four input ends and five output ends. The output terminals of the n composite devices (361 to 36n) 36 are connected to correspond to the 5n output terminals of the output unit 37, respectively.
[0026]
Here, the operation from the crosspoint device 34 to the output unit 37 will be described. During the 1125-line serial digital signal processing, the signals Pb, Yc, Pr, Yo derived from the crosspoint device 34 are n composite devices. (361 to 36n) is supplied to one of 36, restored to an input 1125 line serial digital signal, and then taken out from one of the corresponding five output terminals in the output unit 37. It is. Such signal processing is also performed on 4n signals derived from the crosspoint device 34.
[0027]
In addition, when processing the 525-line serial digital signal, the four 525-line serial digital signals derived from the crosspoint device 34 pass through one of the n composite devices (361 to 36n) 36 as they are. After that, it is taken out from four of the corresponding five in the output unit 37. Such signal processing is also performed on 4n 525-line serial digital signals derived from the crosspoint device 34.
[0028]
Therefore, according to the above-described embodiment, first, the 10-bit data in the unit parallel digital data is time-divided by the separation device 33 with respect to the 1125-line serial digital signal of 1.5 GHz. The data is converted into a parallel digital signal of 150 MHz that is simultaneously output as bit data, and further, the parallel digital signal is time-divided into four component block signal sequences Pb, Yc, Pr, and Yo that are different from each other. The time-divided 4-component block sequence Pb, Yc, Pr, Yo is serialized for each component block, and then output for each component block simultaneously, so that the output Pb, Yc, Pr of the separating device 33 is output. , Yo are 370 MHz near the frequency specified by the 525-line serial digital signal.
[0029]
For this reason, a single crosspoint device 34 that can switch signals at a frequency specified by the 525-line serial digital signal is used, and the 4-component block given by the separation device 33 is processed during signal processing of the 1125-line serial digital signal. If the signals Pb, Yc, Pr, Yo are simultaneously passed through the crosspoint device 34 and output, the crosspoint device 34 can be shared by the 1125-line serial digital signal and the 525-line serial digital signal, and the signal switching is performed. Is also easier. Further, if the crosspoint device 34 is manufactured for the frequency band specified by the 525 line type serial digital signal, it can be manufactured using a conventional inexpensive device, so that the overall cost of the device is reduced and the device is used by the device. It becomes possible to reduce power consumption.
[0030]
In the above embodiment, an example of a 525/60 component serial digital signal has been described as a 525 line type serial digital signal. However, in addition to this, the present invention can be implemented even with a 4 fsc composite serial digital signal. It is.
[0031]
Further, the present invention is not necessarily limited to the scope of the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.
[0032]
【The invention's effect】
As described above in detail, according to the present invention, the 1125-line serial digital signal and the 525-line serial digital signal can be shared by the crosspoint device, thereby reducing the cost and power consumption of the device. A switching device can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a circuit configuration of a separation device that performs signal conversion on an 1125-line serial digital signal according to an embodiment of the present invention;
2 is a diagram showing signal timing indicating signal conversion operation of the separation device of FIG. 1 in the embodiment. FIG.
FIG. 3 is a diagram showing an example of a circuit configuration of a composite device that performs signal conversion on an 1125-line serial digital signal and a normal 525-line serial digital signal in the embodiment;
FIG. 4 is a diagram showing an example of a configuration of a signal switching device that performs signal switching between a 1125-line serial digital signal and a 525-line serial digital signal in the embodiment;
[Explanation of symbols]
12, 22 ... S / P converter,
13: separation circuit,
14, 24, 26 ... P / S converter,
23 ... Composite circuit,
31, 35 ... input section,
33. Separation device,
34 ... Crosspoint device,
36 ... Composite device,
37: Output unit.

Claims (4)

A 1125-line serial digital signal in which a plurality of parallel digital data having a fixed number of bits is arranged in series, and has a lower frequency than the 1125-line serial digital signal, and also has a fixed number of bits. In a signal switching device for switching between a 525 line type serial digital signal in which a plurality of parallel digital data are arranged in series,
The number of output terminals equal to the number of bits in the unit parallel digital data of the 1125 line type serial digital signal is input, and a plurality of bits of data in the unit parallel digital data are sometimes received by inputting the 1125 line type serial digital signal. A first signal converting means for dividing the data into a first parallel digital signal by dividing the plurality of time-divided data into the first parallel digital signals by simultaneously outputting from the output terminals corresponding to the number of bits;
The first parallel digital signal output by the first signal converting means is time-divided into component block sequences that are different from each other, and the time-division component block sequence is serialized for each component block. Then, a second signal conversion means for converting into a second parallel digital signal by simultaneously outputting each component,
A cross-point portion capable of switching signals at a frequency specified by at least the 525-line serial digital signal, and a second signal output from the second signal conversion means when the 1125-line serial digital signal is input. A signal switching unit that outputs a parallel digital signal through the cross point unit and switches the 525 line type serial digital signal to be output through the cross point unit when the 525 line type serial digital signal is input; ,
A P ( parallel ) / S (serial) converter for the 1125 line system and a P / S converter for the 525 line system, from the signal switching means at the time of signal input of the 1125 line system serial digital signal The output second parallel digital signal is restored to the 1125 line system serial digital signal at the time of input by the 1125 line system P / S converter, and the P / S conversion for the 525 line system is used. A 525 line system black signal is output by the device, and when the 525 line system serial digital signal is input, the 525 line system digital signal output from the signal switching means is converted to the P / S for the 525 line system. In addition to output from the converter, the P / S converter for the 1125 line system outputs a black signal of 525 line system. Signal switching apparatus characterized by comprising and an output means for force.   The second signal conversion means is configured to output the first signal output from the first signal conversion means when the 1125-line serial digital signal is composed of four component blocks of Pb, Yc, Pr, and Yo. The parallel digital signal is time-divided into four component block sequences Pb, Yc, Pr, Yo, and serialized for each component block with respect to the four component block sequences Pb, Yc, Pr, Yo. 2. A signal switching device according to claim 1, further comprising means for simultaneously outputting each component.   2. The signal switching device according to claim 1, wherein the 525-line serial digital signal is a 525/60 component serial digital signal.   2. The signal switching device according to claim 1, wherein the 525-line serial digital signal is a 4fsc composite serial digital signal.

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