DD232152A5 - METHOD FOR STORAGE AND RECOVERY ON VIDEO MEDIA OF STORED INFORMATION - Google Patents

Abstract

The object and the object of the invention are to enable the storage of a page or an image with the single limiting factor, that of the recording medium. The object is achieved by virtue of the fact that a data record which can be reproduced on a television receiver is effected by the control of a computer and during the recording of each data element a single code is inserted in the picture blanking bar representing the address or index table of the individual data element of the information ,

Description

65 104 13

Method for storage and retrieval of information stored on video media

Field of application of the invention

The invention relates to a method for storing and retrieving information stored on video media.

Characteristic of the known technical solutions

There is no system known and available that can save and retrieve individually addressed information frames in the form described herein. There are several forms of video editing devices, but they do not address themselves to the same problem; they are capable of accessing certain data in pictorial, graphic or textual form or a combination of these forms. There are also various forms of teletext wherein the information is transmitted in the video blanking interval of a television signal which is in the receiver in a page Text or graphic representations with very low resolution must be decoded.

Object of the invention

It is an object of the present invention to enable storage of a page or image with the single limiting factor, that of the recording medium.

Explanation of the essence of the invention

The invention is based on the object, a method for storage and retrieval stored on video media

/ ^ r n-4 Co

To provide information.

At present, using a low cost, half-inch helical scan video storage device results in a bandwidth of approximately 2.8 MHz, which is more than sufficient to render a high resolution image. A laser plate system could also be used in the same intended function; a recording device is available.

According to the invention, a data record which can be reproduced on a television receiver is carried out in accordance with the control of a computer, and during recording of the respective data item, a single code which is the address or index of that single information item is inserted in the picture blanking interval.

In the preferred embodiment, the index code is recorded on both the odd and even portions of the video signal derived from a color camera or other video source. The code is recorded during one line period, excluding the synchronization periods, and may also consist of eight binary digits of a header and 16 binary codes. This code of three eight digit binary digit words is recorded in a synchronous NRZ form onto the video signal at a speed of approximately 554.2 Kbps. This allows 5, us synchronization, 5 .us black shoulder before and after the signal, which takes 43.3AiS. There has been no need to use any other modulation techniques with respect to the code signal. This is mainly because the direct current

component of the code signal is obtained by the frequency modulation techniques peculiar to the video recording process.

The protection against tape damage can be achieved by a twenty-fold repetition of the data and address codes, d, h. by creating twenty memory fields of the same data as well as the code. At such a level of redundancy, this enables a storage capability of 4500 records on a 60 minute tape. Of course changing the memory array redundancy up to 10 memory arrays would result in a doubled capacity up to 9000 separate records. Using a three-hour standard band at the redundancy level with 20 memory fields, 13,500 records to be stored were allowed. For a one-hour laser video disc, where there is no wear on the storage media, a total of 90,000 records could be stored with no need for any redundancy. The index codes can be numeric series.

An xdexited band may consist of 200 seed pseudo-sets indicating the start, 4 500 actual records, and 200 pseudo-sentences indicating the end. The above indexed tape is made in accordance with the control of an external microcontroller or a timer device of the camera or other video source by supplying the synchronization information to the microcomputer.

In order to have access to a single record on an indexed tape, these precautions are required to pass the index code of the required record over one

Keyboard input. The software reads from the tape the index code of the present record and compares it with the input index code by subtracting one from the other. If the result is affirmative, the recorder is switched to fast-forward mode and pulses are read from the reel tables for a period of time substantially proportional to the result of the subtraction. Should the subtraction result be negative, the recorder is switched to the rewind mode and the pulses from the reel tables are read again for a period of time that is substantially proportional to the result. About five recordings before the required recording is stopped the recorder and another comparison is made; the comparisons are then continued record by record. If an agreement is detected between the inputted index code and the index code of the currently present record, the transport of the record is stopped and the required record is displayed. After a delay of three minutes, the recorder is put into the wait state, i. H. the tape is untied. This is done to prevent damage to the data and to protect the recording Z playback heads of the recording device. This would not be necessary with a laser plate system because there is no contact between the storage media and the readout device.

embodiment

In the following, individual arrangements for carrying out the invention will be described in its operation by embodiments and with reference to the accompanying drawings,

which represents a circuit and a block diagram of the system.

Referring to the drawing, a standard Z 80 microcoraputer 11 is used as the controller. The address and data buses 12, 13 are buffered by tri-state buffers 14, 15. The address bus is routed to a port decoder 16, a ROM address decoder 17, a serial Z 80 port device (SI 01) 18, and two parallel Z 80 port devices (pIO) 19A, 19B. The data bus 13 is fed to the ROM 20, the SIO 18 and the PIO chips 19A, 19B. An unbuffered control bus is also provided to power the above components.

The bus buffers 14, 15 include the three-state standard non-inverting octal buffers 74LS245; two of them are for the address buffer and one for the data buffer. This choice was made considering a low input load, a large input hysteresis, a small port to port propagating delay time (8 ns), and a lightweight circuit board design. All integrated TTL circuits are of the LS type to reduce the need for the power supply. It is not possible to use the leads of the video recorder due to the number of integrated circuits used. The gate input line of the address buffer 14 pin list is connected to the 5V power supply since the address bus is unidirectional. However, the gate input line 22 of the data bus 15 is connected to the NOR gate outputs of the port and ROM address decoders 16, 17, which provide a DIR signal to the bidirectional data buffer to also allow for interruptions to control the bus line.

-6-The available port addresses are as follows:

S.I.O 18-20-23 sixfold P.1,0 19A-24-27 sixfold P.I.O 19B-28-2B sixfold.

Since all of these integrated circuits have their own internal control registers, the address line Al is used for the A / B port selection, the address / selection line AO for control / data selection and the address lines 7-2 for the gate selection.

The port decoder 16 consists of a 3- to 8-line decoder 74LS138 24, a 4-port NOR gate 25 with two inputs 74LS00 and a 3-port NOR gate 26 with three inputs 74LS27. The operation of the port decoder 16 is as follows. The address lines A2-A5 are applied to the inputs of the decoder 24 74LS138 together with A6-A7 via the NOR gate 26 74LS27. Also, the IORQ signal is used, with the ports required being within the Z80 input-output address space for faster block transfer. The outputs of the 74 LS 138 decoder YO-Y3 are used directly as a CS signal for the port devices 18, 19A, 19B.

The ROM 20 is a 2732 EPROM and occupies the address trait D 000-D FFF sixfold. The ROM decoder 17 is composed of three TTL integrated circuits-a high-speed decoder 27 of the type 74 LS 138 having three to eight lines, a four-port NAND gate 28 of type 74LS00 and a triple NOR gate 29. The address lines A to A 14 are connected to the three binary select inputs of the decoder 27. The address line A 15 is with

the enable input Gl, while a signal MREQ is connected to the enable inputs G2A G2B. The output is taken from output Y5 and is then used as signal CS "for ROM 20. Examination of the binary structure at A12-A15 shows that the use of output Y5 results in a select signal over the exact address range DOOO-DFFF. In addition, another ROM blank should be requested, it is very easy to take the CS signals from Y5 to Y7, signal Y5 is also inverted by a NAND gate, and then passes through a NOR gate with port CS to to generate the data buffer signal DIR.

The serial port 18 consists of a half Z80-S · I.O. component with two flip-flops 41 of the type 74 LS74. The 780 S.I.O. device is basically a serial to parallel decoder, although in fact it is a high performance integrated circuit that includes its own control register (see Z80 3.1.0 Technical Manual Zilog). It is designed to use FF hex as the monosynchronous word in the synchronization mode. The data is transferred to the S.I.O. element using the OTIR instruction of the ^ 80 device after the frame sync pulse is detected. The data is held until CTS goes down; this signal is derived from the line synchronization shaping circuit.

When the internal data buffer TX of the S.I.O. element is filled, the WAIT line is pulled down to stop another data transfer until the buffer again has a blank. When the signal CTS drops, the data is transferred to a six-fold inverter 36 of the type 74LS14, which inverts the signal, which is then inserted into the

Video path is guided. The signal is inverted to bring the sync word to black level. During the receive mode, the frame sync pulse is detected by the playback video signal and the above method is reversed, and using a CMOS 4049 six times inverter 31, the signal is inverted and applied to the RX input of the SIO element 18 where it is Signal DCD is at the L level into which input buffer is being fed. If the INIR command of <Z 80 is used, the SIO element 18 reads the incoming data that will strip the leading FF header header; this data is stored in an intermediate buffer within the memory, where it is then converted to the desired delay for search purposes.

The devices used in the form of dual parallel ports 19A, 19B are integrated Z80-PI0 circuits (see Z-80 ΡΡΙΙΟΟ Technical Manual Manual Manual Manual Manual Manual Manual Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und und Port und Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port Port) structured an output with the following bit assignments:

P. I, O. 19A Port A

Bit O a F / S Synchronization in active upper state Bit 1 = s L / S Synchronization in active lower state Bit 2 a CTL Track pulse, active in lower state Bit 3 β Pause LED in active lower state Bit 4 β Recording mode rdy in active lower state

Bit 5 a pause mode rdy in active low state Bit 6 a tape reel - real table pulse Bit 7 a Head switchover, mode rdy playback

Port B

Bit 0 a Rewind output

Bit 1 = stop output

Bit 2 a Fast forward output

Bit 3 s pause output

Bit 4s recording output

Bit 5 a Playback Output

Bit 6 = slow forward output

Bit 7 β micro / VCR video switching output

P I.O. 19B Port A

Bit O = Ext comp rdy, active lower state

Port B

Bit O = Ext comp, active upper state Bit 1 a Delete text location (supress erase) Bit 2 a Alarm.

As can be seen from the above list, the VCR is controlled by the ports A and B of the P, I.O. circuits 19A and 19B.

It is necessary to synchronize the transmission of the data in the video signal to the line clock. Finally, a line synchronization shaping circuit 32 is provided. It includes two synchronous 4-bit binary counters 32A, 32B of the type 74LS161 which are interconnected in such a manner that using a delayed, delayed frame synchronization of the dual monostable network 23 of type 74LS123 as a load signal and stretched delayed line synchronization pulses the network 23 is generated as a clock signal, a signal which is synchronized with the halved system clock; this. Signal is now the CTS signal for the S, I, O »circuit 18.

This CTS signal consists of sixteen slow pulses as / fine block, about sixteen conduction periods after the frame sync pulse. During this time, the S.I.O. circuit 18 can transmit its data.

The dual monostable network 23 is supplied with the signals from the VCR via the transistor networks 41 and 42 and a quad NAND gate 21.

In order to automatically switch the display from that of the microcomputer to that of the video recorder, a four-way switch CMOS 4066 35 is provided. A signal is transmitted from PB7 to a transistor 40 of the type BC 107 and a switch pair of the four-way switch 35. The inverted signal is then applied to the other pair of switches of the four-way switch 35. In this way, it is possible to switch the video output as desired.

The video storage device may require a separate switch, e.g. B * if the internal microcontroller uses a highlighted handset. Two integrated circuits 39 in the form of a four-way switch 4066 are used for this function. The switched outputs are controlled via the contacts of the relevant switches in the video storage device.

The CTC device 33 is not used in the apparatus as described, but is intended to allow the apparatus to be coupled to another machine. Although in the described arrangement the apparatus is used exclusively with its own microcomputer, a means for interruptions in the event is available, so that the apparatus is arranged to share, for example, a minicomputer which also performs other tasks.

The described system operates with inexpensive video storage devices of the type of home video equipment and processes image information with a high information density in a fast reading time. It identifies the information on an image basis and not on a voice channel. It naturally processes text and graphics except images, but it works primarily in the field of image storage and image recovery, which has been a problem heretofore.

Although the individual arrangements described above include the use of a video recorder, there are no specific limitations within the concept of the invention that prevent its use with any system capable of recording a video signal. Therefore, it is intended that the use of a laser / optical disk system with read, erase, write facilities be within the scope of the invention. The process of acquiring individual images in the image blanking interval may be applied to any method of recording a video signal, such as phase transformation, wherein the phase of a material, e.g., tellurium suboxide doped with germanium indium lead, is of a highly reflective crystalline phase a less reflective, non-crystalline phase is changed under the action of a low-energy laser beam; magneto-optic, creating domains with reverse magnetization and the action of an applied vertical magnetic field in conjunction with a laser beam, which increases the separation locally beyond the Curie point of the base material terbium and iron-gadolinium-bismuth. In the latter case, the altered magnetic domain may be altered

Rotation of a polarized light beam may be displayed. Yet another form of laser plate may use the polymer dye technology. The actual methods used to store and recover the video signals are of little importance in themselves since the system of the invention operates on the video signal and does not depend on the media used to store the signal.

Modifications are easily made to accommodate the fact that the sand is basically a linear storage medium with the information applied to the laser / optical disks in a spiral shape. While in the present implementation the spacing between the records is a function of the record length, in a laser / optical disc system, the spacing between records is an angular calculation based on the instantaneous position of the read-write device and the position of the next , record to be taken into account. This is a considerable advantage in terms of access time; this is the time, so to speak, to get a new record, since it is not a big task to put a light read-write device back into position. The required hardware is generally present in the laser / optical disk system again, and a suitable interface between the existing electronic controls in the laser / optical disk system and the described system can be easily provided. "There is already a spare capacity in the described system for this purpose.

Claims (10)

He is entitled to claim A method of storing and retrieving video data, characterized in that a data record that can be reproduced on a television receiver is made by controlling a computer, and during the recording of each data item a single code is inserted in the picture blanking interval containing the address or index table represents the individual data element of the information. 2. The method according to item 1, characterized in that the index code is recorded on both the odd and the even portions of the video signal, which is derived from a television camera or other video source. Method according to items 1 or 2, characterized in that the index code is recorded during the line period which excludes the synchronization periods. 4. Method according to items 1 or 2, or 3, characterized in that the index code contains eight binary digits of the synchronization header and is applied directly to the video signal in a synchronous NRZ form. 5. Method according to one of the preceding points, characterized in that each data element and its index code is recorded at a plurality of times in order to obtain a protective redundancy level. 6. The method according to any one of the preceding points, characterized in that the recording medium is a video tape. Method according to one of the items 1 to 5, characterized in that the recording medium is a laser-written plate. 3. The method according to item 6, characterized in that the tape carries a guide series of pseudo-sentences to indicate its start, and to display a final series of pseudo-sentences around its end. 9, method according to the items 6 or 8, characterized in that the index codes of the recorded data elements are arranged in numerical order, and in that to find a single recorded data element, the index code of this data element is entered, for example by a keyboard, with the index code comparing the currently existing record and triggering the fast forward and backward movement of the tape in accordance with the arithmetic sign of the comparison result, which continues for a period of time substantially proportional to the result, until approaching the record to be recorded, whereupon more Compare recording for recording until a match is achieved and the record that has the comparison index code is displayed. 10. The method according to item 6 or 8 or 9, characterized in that, after a predetermined period of time has elapsed, the following indication of a retrieved recording of the tape is released. 11. The method according to item 7, characterized in that, to retrieve a single displayed data item, the index code of that record is entered, for example, by a keyboard and compared with the index code of the currently present record, and that the read-write device relative to the recording disk is shifted in accordance with an angle calculation which is based on the location of the instantaneous record and the reference position to be found, Apparatus for recording and retrieving data records reproducible on a television receiver or monitor, characterized by a video recording storage medium and means for writing data records to said medium and means for reading data records from said medium, a television camera or another video signal source for forming data records which are stored as video signals and which encode television picture periods of normal picture information, interlacing picture blanking intervals, means for forming an index code for insertion into the picture blanking intervals of each coded record, an index code uniquely identifying that record wherein said video signals and said inserted index code are recorded on said storage medium by said writing means, 13. means for entering the index code of a stored record to be retrieved and search means responsive to the input of an index code to search the stored sets on the record medium until a stored record having an image blanking interval is found and the index code matches the inputted code, with the stored record with the matching index code coming out of the record medium and regenerating the resulting one Video signal is transmitted to the television receiver or monitor, decoded and displayed. - For this 3 pages drawings -