JPH0527314B2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to an image reproduction system.

(Prior Art) Conventionally, devices that use reproduced image signals obtained by reproduction devices that reproduce image signals include television receivers, printers, transmitting devices that transmit image signals electronically using telephone lines, etc. There is.

Incidentally, in recent years, there has been remarkable progress in systems using color image signals, and the development of recording and reproducing devices such as color video tape recorders, color still image recording and reproducing devices, color printers, and color image signal transmitting devices is progressing. .

Further, recording and reproducing devices for color image signals are generally capable of recording and reproducing not only color image signals but also black and white (monochrome) image signals.

However, when trying to supply a black and white image signal reproduced by such a color recording/reproducing device to a color printer or a color image signal transmitting device for printing or electronic transmission, the time required for printing or transmission is longer than the color image signal. The amount of time it takes to do this is the same as when dealing with other documents, and this creates a major obstacle in speeding up office work and in improving operability.

(Objective) In view of the above-mentioned drawbacks, it is an object of the present invention to provide a system that can speed up and simplify processing in a device that handles reproduced image signals obtained by a reproduction device.

(Examples) The present invention will be described in detail below using examples. Note that the citation of the following examples does not limit the scope of the present invention, and the present invention can be modified as appropriate within the scope of the claims.

FIG. 1 is a diagram showing an image reproduction system as an embodiment of the first invention of the present application. In this embodiment, the first invention of the present application is applied to a system including a reproducing device that obtains a still image signal by reproducing one field of an image signal recorded as a still image on a circular track of a recording medium. be.

In FIG. 1, 1 is a playback device, 2 is a printer as another device, and 3 is a transmitter as another device. First, the playback device 1 will be explained. 4 is a magnetic sheet, and on a circular track on the sheet 4, image signals for one field are recorded.
5 is a motor that rotates the seat 4 at a predetermined speed;
is a magnetic head that traces on the magnetic sheet 4.

Here, the sheet 4 is rotated at the same rotational speed as during recording, and the same circular track is continuously reproduced by the magnetic head 6, thereby obtaining a reproduced still image signal. The image signal reproduced by the head 6 is amplified by a reproduction amplifier 7 and then supplied to a luminance signal/chrominance signal (Y-C) separation circuit 8. The image signal format currently recorded is a multiplex of a luminance signal that is FM modulated in a high frequency band and a color signal that is a line sequential color difference signal that is FM modulated in a low frequency band. shall be.

The Y-C separation circuit 8 separates the FM modulated luminance signal and the
An FM modulated line sequential color difference signal is obtained, the FM modulated luminance signal is supplied to an FM demodulation circuit 9, and the FM modulated line sequential color difference signal is supplied to an FM demodulation circuit 10, respectively.
The reproduced luminance signal obtained by the FM demodulation circuit 28 is supplied to the process circuit 11. In addition to the well-known clamp circuit and de-emphasis circuit, the process circuit 11 includes a circuit that compensates for discontinuity in the horizontal synchronizing signal that occurs when one field of image signals is continuously reproduced. The reproduced luminance signal obtained by the process circuit 11 is supplied to the encoder circuit 12.

On the other hand, the reproduced line-sequential color difference signal obtained by the FM demodulation circuit 10 is supplied to the process circuit 13. The process circuit 13 is a circuit that synchronizes line sequential signals,
It includes a circuit that compensates for the discontinuity of the horizontal synchronization signal mentioned above. Two color difference signals obtained by the process circuit 13, for example, B (blue)-Y and R (red)-Y, are supplied to the encoder circuit 12.

The line-sequential color difference signal reproduced by the FM demodulation circuit 10 is also supplied to the level detection circuit 14. The level detection circuit 14 determines whether the image signal being reproduced is a monochrome image signal or a color image signal by detecting the level of the reproduced color signal. When the detection circuit 14 discriminates the type of image signal in this way, the discrimination signal output from this circuit 14 is sent to the output terminals 15, 15' and the sequence circuit 16.
is supplied to The sequence circuit 16 controls each part of the signal processing circuit according to this discrimination signal. For example, when the reproduced image signal is a monochrome image signal, the processing circuit 13 is controlled to perform processing such as cutting off the transmission path of the color signal processing system. Also, encoder circuit 1
2 supplies a television signal such as an NTSC signal to output terminals 17 and 17'.

The image signal output to the terminal 17 is supplied to the signal processing circuit 20 via the input terminal 18 of the printer 2. On the other hand, the aforementioned discrimination signal outputted to the terminal 15 is supplied to the sequence circuit 21 of the printer 2 via the input terminal 19. The sequence circuit 21 processes the signal processing circuit 20 and the printer section 2 according to the discrimination signal.
Control 2. That is, the signal processing method in the signal processing circuit 20 and the printer are designed such that when the image signal input to the signal processing circuit 20 is a monochrome image signal, the time required to print an image in the printer unit 22 can be shortened compared to when the image signal is a color image signal. The timing of printing in the unit 22 is controlled. Furthermore, the supply of power to the color signal processing portion of the signal processing circuit 20 is stopped. By doing so, it is possible to shorten the image printing time and further reduce power consumption.

Further, the image signal output to the terminal 17 is supplied to the signal processing circuit 25 via the input terminal 23 of the transmitting device 3. On the other hand, the aforementioned discrimination signal outputted to the terminal 15 is supplied to the sequence circuit 26 of the transmitter 3 via the input terminal 24. Sequence circuit 26
controls the signal processing circuit 25 and the transmitting circuit 27 according to the discrimination signal. That is, when the image signal input to the signal processing circuit 20 is a black and white image signal, the signal processing circuit 25 The signal processing method and the transmission timing in the transmission circuit 27 are controlled. For example, during a period in which a color information signal is being transmitted when a color image signal is being transmitted, a luminance information signal is also transmitted when a monochrome image signal is being transmitted. Furthermore, the supply of power to the color signal processing portion of the signal processing circuit 20 is stopped. The signal transmitted by the transmitting circuit 27 is supplied from an output terminal 28 to a receiving device via, for example, a telephone line. With such a configuration, it is possible to shorten the image transmission time and reduce power consumption.

FIG. 2 is a diagram showing a reproducing device in an image reproducing system as another embodiment of the first invention of the present application. The configurations of other devices can be similar to the system shown in FIG. 1, and the drawings and explanations will be omitted. Components in the reproducing apparatus shown in FIG. 2 that are similar to those of the reproducing apparatus 1 shown in FIG.

In FIG. 2, during the vertical blanking period of the image signal for one screen written on the circular track of the magnetic sheet 4, the type of image (color image signal or monochrome image signal, furthermore, the adjustment It is assumed that a discrimination signal is FM-modulated and multiplexed together with a luminance signal. FM
The discrimination signal is multiplexed in the vertical blanking period of the reproduced luminance signal demodulated by the demodulation circuit 9. The discrimination signal reproducing circuit 29 separates the discrimination signal, generates a discrimination signal similar to that generated by the level detection circuit 14 in the system of FIG. .

Even in a system using a playback device having such a configuration, effects similar to those of the system shown in FIG. 1 can be obtained. Furthermore, when the reproduced image signal is a binary image signal, the printer 2
By operating the sequence circuit 21 of the printer 2 and the sequence circuit 26 of the transmitting device 26, the printing time in the printer 2 and the transmitting time in the transmitting device 3 are further shortened. Note that the discrimination signal is not limited to being multiplexed in the vertical blanking period of the image signal, but may be multiplexed in other parts such as the horizontal blanking period, or in other bands such as the extremely low frequency band. It may be recorded on another medium.

FIG. 3 is a diagram showing a reproducing device in an image reproducing system as an embodiment of the second invention of the present application. The configurations of other devices can be similar to the system shown in FIG. 1, and the drawings and explanations will be omitted. Further, in the reproducing apparatus shown in FIG. 3, the same components as those of the reproducing apparatus 1 shown in FIG.

In FIG. 3, 30 is a mode selection circuit;
Select the type of image signal to output. A selection signal output from the mode selection circuit 30 is supplied to the sequence circuit 16, and the sequence circuit 16 controls each signal processing circuit in the device according to this selection signal.

First, when a color image signal is selected, the gate circuit 31 is rendered conductive, and the line-sequential color difference signal demodulated by the FM demodulation circuit 10 is supplied to the process circuit 13 as it is. In addition, the switch 32 is
The output luminance signal of the process circuit 11 is output to the encoder circuit 12 as it is. When a black and white image signal is selected, the gate circuit 31
is rendered non-conductive, the color signal transmission system is cut off, and the FM demodulation circuit 10 and process circuit 13
Stop supplying power to unnecessary parts such as Further, when a binary image signal is selected, the switch 32 is connected to the B terminal, and the output luminance signal of the process circuit 11 is binarized and supplied to the encoder circuit 12. In addition, the FM demodulation circuit 9 and the process circuit 11
The luminance signal is prevented from passing through a portion of the luminance signal processing circuit that is related only to the demodulation property.

The selection signal, which is the output of the mode selection circuit 30, is supplied to other devices via terminals 17, 17' and functions similarly to the discrimination signal in the system shown in FIGS. 1 and 2. This allows printer 2
can reduce printing time,
In the transmitter 3, the transmission time can be shortened. For example, when a color image signal is selected, the print time is 3 to 4 minutes as before, and the transmission time is 10 to 20 minutes when using a public telephone line, but 2.
When a digital image signal is selected, the printing time can be reduced to 1 minute or less, and the transmission time can be reduced to 1 minute or less.

In the above-described system, circuits conventionally known in this type of system, such as a dropout compensation circuit, are omitted for the sake of simplicity.

(Effects) As described below with reference to embodiments, the present invention provides an image reproduction system that can always maximize the speed of processing in a device that handles reproduced image signals obtained by a reproduction device. Also, the power consumption of the system can be minimized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an image reproduction system as an embodiment of the first invention of the present application, and FIG.
FIG. 3 is a diagram showing a reproducing device in an image reproducing system as an embodiment of the second invention of the present application. 1 is a playback device, 2 is a printer as another device, 3 is a transmitter as another device, 6 is a head, 7 is an amplifier, 9 and 10 are FM demodulation circuits, 1
1 and 13 are process circuits, 14 is a level detection circuit, 16 is a sequence circuit of the reproduction device, 20 is a signal processing circuit of the printer, 21 is a sequence circuit of the printer, 25 is a signal processing circuit of the transmitting device, 26
29 is a sequence circuit of the transmitting circuit, 29 is a discrimination signal reproducing circuit, 30 is a mode selection circuit, 31 is a gate circuit, 32 is a switch, and 33 is a binarization circuit.

Claims (1)

[Scope of Claims] 1. A reproducing device including a reproducing means for reproducing an image signal, and a determining means for determining whether the image signal reproduced by the reproducing means is a color image signal or a monochrome image signal, and reproduction from the reproducing device. A signal receiving device, which includes a signal processing means for converting the signal form of the reproduced image signal reproduced by the reproduction means, and a control means for switching the processing means of the signal processing means according to the determination result of the determination means. An image reproduction system comprising: and other equipment. 2. A reproducing device including a reproducing means for reproducing an image signal and a selection means for selecting whether the image signal to be output is a color image signal or a monochrome image signal, and a signal format of the reproduced image signal from the reproducing device. An image reproduction system comprising: a signal processing means for converting; and another device including a control means for switching a processing method of the signal processing means according to a selection by the selection means.