JPS62152272A - Picture signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform a high speed recording and reproducing on a tape by a base band signal without using a modulating operation by changing the polarity of the base band signal by using a synchronizing signal included in picture information. CONSTITUTION:A picture signal is inputted to a signal polarity converting device 4 and the polarity of the picture signal is changed according to the polarity of the synchronizing signal included in a picture reader. Then, the signal of the signal polarity converting device 4 and the synchronizing signal are recorded respectively on the tape by recording heads 6, 10. The signals recorded on the tape are reproduced respectively by reproducing heads 11, 13. Then, the polarity of the signal from the reproducing head 11 is changed according to the polarity of the synchronizing signal obtained by the reproducing head 13 by a signal polarity converting device 12. Thus, the base band signal can be recorded as it is at high speed without requiring an operation of the modulation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image signal recording and reproducing apparatus that records an image signal on a cassette tape and reproduces it as necessary to obtain the original image signal.

2. Description of the Related Art When recording image information, there is a need for a recording medium with a high recording speed and a large recording capacity since the amount of information is large. Conventionally, image recording/reproducing WiW using a hard disk has been used, but it has the drawback of being very expensive. On the other hand, a device using a cassette tape as an inexpensive recording medium with a large recording capacity is used for recording program data of a personal computer.

An example of the above-mentioned conventional recording/reproducing device will be described below with reference to the drawings.

FIG. 4 shows a conventional recording and reproducing apparatus using a cassette tape. In FIG. 4, l is an image reading device, 2 is F
SK modulation/demodulation circuit, 3 an equalizer circuit, 4 a recording/reproducing node, 5 a printer, and 6 a recording/reproducing device.

The operation of the recording/reproducing apparatus as described above will be explained below.

First, an image signal to be recorded taken in by the image reading device 1 is converted into a digital signal representing white and male, frequency modulated in the FSK modulation/demodulation circuit 2, and sent to the equalizer circuit 3 for recording and reproduction.

is recorded on a cassette tape via the card 4. In the case of reproduction, the reverse operation is performed, and the data recorded on the tape is outputted via the printer 5 as an image signal.

Problems to be Solved by the Invention However, with the above configuration, since FSK modulation is performed and recorded on tape, the band is more than twice as wide as that of a baseband signal, and the recording speed is limited at best due to the frequency characteristics of the tape. Currently, it is used at about 1200 bits/second. Therefore, when used as an image information recording/reproducing device, there is a problem in that the recording time is too long. Further, recording using a baseband signal can shorten the recording time, but since it contains a DC component, the recording waveform is deformed, making it unsuitable for tape recording in terms of error rate and the like.

In view of the above problems, the present invention provides a recording device that can record data on a tape without using modulation operations and shorten the recording time by removing the DC component from the baseband signal of image information. It is.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention is configured to change the polarity of the Heath hand signal by using a synchronization signal included in the image information. be.

Function: According to the present invention, image information can be recorded and reproduced from a tape at high speed using a baseband signal by using the above-described method without using a modulation operation.

Embodiment Hereinafter, an image signal recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a recording/reproducing apparatus in an embodiment of the present invention. In FIG. 1, 1 is an image reading device;
2 and 15 are buffer memories, 3 is a signal waveform conversion circuit, 4
and 12 are signal polarity conversion devices, 5.9.16 are input/output interfaces (hereinafter referred to as I10), 6 and 10 are recording heads, 7 is a synchronization signal generator, 8 and 14 are synchronization signal polarity determination circuits, +1 and 13 is a playback head, 17 is a printer section, 18 is a recording section, and 19 is a playback section.

Regarding the recording and reproducing device configured as above, the following is the second section.
The operation will be explained using FIGS. 3 and 4.

Consider a facsimile image signal as image information. First, the recording operation will be explained. An image reading device 1 reads a document, digitizes the image signal into white and black binary signals, and outputs the digital signals (see FIG. 2). This binary signal is stored once in the buffer memory 2 and is then stored in the signal waveform conversion circuit 3.
In order to suppress the signal frequency band in
Turn to Zero (hereinafter referred to as Nl'?Z)
The signal is converted into a code (FIG. 2(b)) and input to the signal polarity converter 4. The sync signal polarity determination circuit 8 judges the polarity of the sync signal (FIG. 2 (C)) generated by the sync signal generator 7. If the polarity is positive, the signal polarity converter 4 converts the image signal. The signal remains as it is, or if the polarity is negative, the polarity of the image signal is changed to generate a ternary signal (Figure 2 (e))
Output as . This signal is recorded on the second track of the cassette tape via the recording head 6. On the other hand, the synchronization signal generated by the synchronization signal generator 7 is l109
, are recorded on the first track of the cassette tape via the recording head 10.

Next, the playback operation will be explained. Information recorded on the cassette tape can be retrieved via playback heads 11 and 13. The reproducing head 13 retrieves the information recorded on the first track of the cassette tape, and the reproducing head 11 retrieves the information recorded on the second track of the cassette tape. Therefore, the ternary data signal is reproduced by the reproduction head 11 (FIG. 2(g)), and the synchronization signal obtained by the reproduction throat 13 (FIG. 2(f)).
) is input to the signal polarity converter 12 together with the signal (FIG. 2(h)) via the jlJl signal polarity determination circuit 14.

The signal polarity converter 12 converts the data signal (Fig. 2 (g)) as it is if the polarity of the synchronization signal (Fig. 2 ()) is positive, and converts the data signal (Fig. Figure 2 (
g) Output the polarity of ('IM 2 [o)]. This signal is once stored in the buffer memory ]5 and printed on paper by the printer 17 via <, &11016.

In this series of operations, the data signal recorded on the tape is converted into a white and black binary digital signal obtained by an image reading device (Fig. 3(a)), which is converted into NRZ encoded data signal (Fig. 3(b)). , is a ternary signal (Figure 3 (C)) whose polarity is changed according to the polarity of the synchronization signal.General N
While the RZ code contains a DC component, this signal does not have a DC component and there is no waveform deformation when recording on tape, so it can be recorded at high speed as a baseband signal without modulation, and the recording and playback time can be shortened. Shortening is possible. This device uses NRZ
Return to Zero code (
In the case of FIG. 3(a), it is also possible to record on tape without modulation by a similar operation. However, since the data frequency band is twice that of the NRZ code, the recording speed is halved (Fig. 3 te1. [fl). Also, bipolar code (Figure 3(d)
)) also does not contain a DC component and can be expected to produce similar results to this device. The image data signal of a facsimile machine has a large number of "white" parts, and the "white" data is usually expressed as "1" (positive logic) in consideration of the S/N ratio. Therefore, many continuous data strings of 1" are generated, and considering the frequency distribution of the data, the code proposed by this device has a higher distribution density in the low frequency range than when using a bipolar code (Figure 3 (g) ), (
hl) allows for faster recording.

As described above, according to this embodiment, the image signal is input,
a recording unit comprising a signal polarity converter that changes the polarity of a previous image signal according to the polarity of a synchronization signal of an image reading device; and a recording head that records the signal of the signal polarity conversion device and the synchronization signal on a tape, respectively; a playback head that plays back signals recorded on the tape; and a signal polarity converter that changes the polarity of the signal from the playback head in accordance with the polarity of a synchronization signal obtained by another playback head. By providing a reproducing section, the Heisshand signal can be recorded at high speed without requiring any so-called modulation operation.

Although the present embodiment has been described with reference to the case where a force-scented tape is used, oven reel tape or micro cassette tape may be used.

Further, in this embodiment, when the polarity of the synchronization signal is positive, the polarity of the image signal is not changed, and when the polarity is negative, the polarity is changed, but when the polarity of the synchronization signal is negative, the polarity of the image signal is not changed. , its polarity may be changed when it is positive.

Furthermore, in this embodiment, the synchronization signal was recorded on the first track of the tape, and the image signal was recorded on the second track, but the synchronization signal and image signal were also recorded in parallel on the other tracks, thereby substantially increasing the recording speed. It is also possible to increase

Furthermore, although the recording section 18 and the reproducing section 19 are shown independently in this embodiment, they are shown independently for the sake of explanation, and in reality, some circuits are commonly used in the recording section and the reproducing section.

, Effects of the Invention As described above, the present invention provides a signal polarity conversion device that receives an image signal as input and changes the polarity of the image signal according to the polarity of a synchronization signal of an image signal reading device, and the signal polarity conversion device. A recording section consisting of a recording element that records a device signal and the synchronization signal on a recording medium, a reproduction element that reproduces each signal recorded on the recording medium, and synchronization of the signals reproduced by the reproduction element. Signal polarity change 11 that changes the polarity of other reproduced signals depending on the polarity of the signal! ! The present invention provides an inexpensive image signal recording and reproducing device using a tape that can perform high-speed recording and reproducing using Heas hand signals without performing operations such as modulation when recording image signals by providing a reproducing section consisting of a device and a reproducing section. can do.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an image signal recording device according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram showing signal waveforms of each part in FIG. 1, and FIG. 3 (al to idl are code waveforms). Figure J Tsukasa (
81~(hl is a distribution diagram showing the frequency distribution, and FIG. 4 is a block diagram of a conventional recording/reproducing device. 1... Image reading device, 2.15...
・Panofa memory, 3... Signal waveform conversion circuit,
4.12...Signal polarity conversion device, 5. 9.
16... Human output interface (Ilo)
, 6.10... Record 1', 7...
Synchronous signal generator, 8.14... Same amount signal polarity determination circuit, 11.13... Reproduction head, 17.
...Printer section, 18... Recording section, 19
・・・・・・Reproduction Department. Name of agent: Patent attorney Toshio Nakao Haka 1 person 12 Figure 3

Claims (1)

[Claims] a signal polarity conversion device that receives an image signal and changes the polarity of the image signal according to the polarity of a synchronization signal of an image signal reading device; and a recording device that records the signal of the signal polarity conversion device and the synchronization signal on a recording medium. a recording section consisting of an element, a reproducing element that reproduces each signal recorded on the recording medium, and a signal that changes the polarity of another reproduced signal depending on the polarity of a synchronization signal of the signal reproduced by the reproducing element. An image signal recording and reproducing device comprising: a polarity converter; and a reproducing section comprising a polarity converter.