JPS5938864A - Generating circuit of recording position encoded signal of measured data, and its retrieving system - Google Patents

Abstract

PURPOSE:To generate a recording position encoded signal of a measured data by a simple and inexpensive constitution, by synthesizing a position encoded signal by giving a recognition bit by one each to the front and rear of encoded information from an encoded information generating circuit. CONSTITUTION:An output pulse of an oscillating circuit 11 is frequency-divided by a frequency-dividing circuit 12, and in accordance with this frequency-divided clock pulse, encoded information is generated from an encoded information generating circuit 20. On the other hand, a recognition bit to be given immediately before and immediately behind the encoded information is outputted from recognition bit generating circuits 31, 32. These recognition bit and encoded information are synthesized by a synthesizing circuit 33, and are outputted from an outputting circuit 40 through a parallel/series converting circuit 34 and a mixing circuit 35. A transmitted data is processed by a serial/parallel converting circuit 60, a latch 62, etc., and the recognition bit and the encoded information are outputted.

Description

[Detailed description of the invention] This invention relates to a generation circuit and its retrieval system.

Conventionally, mainly when analyzing measurement data, in order to know the location of the necessary data, encoded information is recorded in a data location search channel different from the channel in which the data is recorded, and the coded information is recorded when it is played back. I am trying to search for the location of data.

For example, simply coded information "olo" and "001" are placed in different locations on the same data location search channel.
Suppose that we have given . However, when reading those encoded information, it is impossible to identify them because there is only one signal that is both "1".

To deal with this, in the location search channel,
A search pulse signal is recorded at regular intervals from the first data recording position of the data recording medium, and when searching for a data position, the search pulse signal is recorded one by one from the first position of the data recording medium. All you have to do is count.

However, this method has the problem that every time new data is retrieved, the retrieval operation must be performed from the first location on the recording medium, which increases the retrieval time.

On the other hand, the following methods can be used to shorten the search time and perform an accurate search. That is, by using a wide pulse as a binary "1" and a narrow pulse as a binary "0", the coded information "01" is used.
There is a method for reliably distinguishing between "0" and "OOl".

However, when this method is used, a circuit for determining the width of the pulse is required, which increases the complexity of the search circuit and reduces the overall cost of the search circuit.
The problem is that this will result in an increase in

The present invention has been made by focusing on such conventional problems, and it is an object of the present invention to provide a measurement data recording position encoding signal generation circuit with a simple circuit configuration and low cost, and to search for the recording position. The purpose of the present invention is to provide a search system that takes a short time to complete and uses a simple and inexpensive search device.

In order to achieve such an object, the present invention provides a coded information generation circuit that generates coded information for position search, and a recognition bit for recording at a position equivalent to the recording position of each measurement data on a recording medium. A recognition pin that generates
The present invention is characterized in that it comprises a generation circuit and a synthesis circuit that adds the recognition bits one before and after the coded information to synthesize a position coded signal.

A second aspect of the present invention also provides a coded information generation circuit that generates coded information for position search and a recognition bit for recording at a position equivalent to the recording position of measurement data on a recording medium. a recognition bit 1--a generation circuit, a synthesis circuit that adds the recognition bits one before and after the encoded information to synthesize a position coded signal, and a recognition circuit that detects the recognition bit from the position coded signal during playback. A device comprising: a bit detection circuit; and a coded information detection circuit that detects a portion of the position coded signal excluding the recognition bit as coded information when the recognition bit detection circuit outputs the position coded signal. It is.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and shows a generation circuit for a measurement data recording position coded signal and its successor/detection circuit.

In the same figure, an output pulse of an oscillation circuit 1 which oscillates at a predetermined frequency is frequency-divided by a frequency dividing circuit 12, and based on the frequency-divided clock pulse OL, a coded information generating circuit 20 generates coded information 01. 5- Generate. This coded information CI is a predetermined pulse train, which is recorded at a position equivalent to the recording position of each measurement data on a recording medium such as a magnetic tape, and is used to search the position of the measurement data. It is.

On the other hand, the recognition bit 1 generation circuit 31 is a circuit that generates recognition bit 1 which is added immediately before the coded information CI. The recognition bit generation circuit 32 is a circuit that generates recognition bits 1-I2 that are added immediately after the encoded information OI. These two recognition bit generation circuits 31 and 32
The recognition pins 1-II and I2 generated by the above and the coded information CI are synthesized by a synthesis circuit 33. The output signal of this synthesis circuit 33 will be referred to as a position coded signal PC.

The output pulse train, which is the position coded signal PC of the combining circuit 33, is formed as a parallel signal, and if it is transmitted as is, a plurality of channels will be required only for the position coded signal PC. Therefore, this signal is converted into a serial signal by the parallel-to-serial conversion circuit 34. This parallel-to-serial conversion circuit 34 can be configured, for example, by a register from shift 1 to shift 1 by the clock signal Of. A mixing circuit 35 is provided that mixes the position coded signal PC, which is the output signal of the parallel-to-serial conversion circuit 34, and the clock signal OT, which is the output signal of the frequency dividing circuit 12. The output signal of this mixing circuit 35 will be referred to as a composite coded signal Co. An output circuit 40 is connected to the rear stage of this mixing circuit 35.

The output circuit 40 is, for example, a circuit for converting an electrical signal into an optical signal or a magnetic signal, and performs, for example, impedance conversion or current amplification in a form suitable for the transmission medium.

Each of the above circuits constitutes a measurement data recording position encoding signal generation circuit.

Further, on the playback/search device side, an input circuit 51 is provided which receives the composite coded signal from the output circuit 40 and converts the optical or magnetic signal into an electrical signal. After this, a separation circuit 52 is provided to separate the position coded signal PC and the clock signal OT, and each signal is waveform-shaped by a position coded signal shaping circuit 53 and a clock signal shaping circuit 54. ing. The waveform-shaped position coded signal PO and clock signal OL are applied to the serial/parallel conversion circuit 60.

Here, the serial/parallel conversion circuit 60 is composed of a shift register or the like, and has a function as a recognition pin 1 to detection circuit and a function as a coded information detection circuit. That is, at the time of playback, the recognition pin is extracted from the position coded signal PC.
-I], I2, and when the recognition bit 1~detection circuit outputs the part of the position coded signal PC excluding the recognition bits II and I2 as coded information CI. and a coded information detection circuit for detecting the encoded information.

Specifically, the signals from the first and final stages of the registers are sent to shift 1 as the serial/parallel conversion circuit 60.
1 is received, and the output of 61 to this ant game 1 is connected to the control pole 62c of the latch circuit 62. Further, the input terminal of the latch circuit 62 is connected to the output terminals of the serial-to-parallel conversion circuit 60 except for the first stage and the final stage. When the latch circuit 62 receives the output signal from the anime game 1-61, it inputs the coded information OI from the serial/parallel conversion circuit 60 and temporarily stores it. This reproduced coded information CI is decoded by a computer or the like (not shown).

Next, the operation of the above embodiment will be explained.

First, measurement data etc. are recorded on magnetic tape etc.
A case will be described in which coded information CI for position detection is recorded at a predetermined position on the magnetic tape. In this case, first, the position of the magnetic tape is set at the position where the encoded information CI is desired to be recorded.

Then, using the coded information generation circuit 20, desired coded information CI is generated. In reality, a counter circuit is used as the coded information OI, and its output pulse is used as the coded information OI. Of course, other means, such as a digital switch, may be used to generate a random combination of pulse trains, which may be used as coded information.

In this way, while generating the coded information CI, the recognition bit generation circuit 3], 32 generates the recognition bit 1-
11. I2 is automatically generated. These two recognition bits II and I2 are set by the synthesis circuit 33, one each before and after the pulse train as coded information OI.

This synthesized pulse train is converted into a serial signal by a shift register, and mixed with a clock signal OL by a mixing circuit 35.

The composite coded signal cc produced in this manner is shown in FIG. Here, although the clock signal OL is a positive pulse, the pulse as the coded information CI and the recognition bits II and I2 are configured as negative pulses. In this way, the clock signal OL is a positive pulse,
By setting the position coded signal PC to a negative pulse, both signals can be recorded simultaneously and easily on one track.

During playback, the signals from the input circuit 51 are separated and then waveform-shaped, and the position coded signal PC and clock signal OT are applied to a shift register as a serial-to-parallel conversion circuit 60. At this time, recognition bit II
, I2 exist at the same time, 61 is output to Antogame-1. Also, at this time, since the latch circuit 62 receives a signal from the shift register, the coded information CI is stored in the latch circuit 62. Conversely, if recognition bit II,
If I2 does not exist at the same time, the latch circuit 62 will not operate, and the coded information CI will not be transmitted to the computer or the like. Therefore, even if the coded information OI is composed of pulses of the same width, they can be reliably discriminated.

That is, for example, coded information OI "01
01" and "1010" are assigned. in this case,
The first bit of each coded information OI is “o
” and “1” are reliably determined, so information can be reliably identified between these encoded information. Furthermore, when searching for a new data recording position, there is no need to search from the beginning of the magnetic tape, so the search time required is shortened. Furthermore, since there is no need to identify the pulse width, the overall configuration of the search device is simple.

In the above embodiment, the operation of the magnetic tape in only one direction was considered, but the same normal operation occurs even when the magnetic tape is run in the opposite direction. However, in this case, the order of the pulse train as coded information OI is reversed, so correction is required.

In addition, the reproduced OT signal is not only used to perform parallel-to-serial conversion of coded information, but also interpolates coded information recorded at intervals and obtains more detailed position information. For example, when measurement data is provided to a computer or the like and is recorded in an analog value, it is used as the timing for converting this into a digital value.

As described in detail above, the first invention of the present application includes a coded information generation circuit, a recognition The second invention comprises a recognition bit generation circuit that generates a bit, and a synthesis circuit that adds the recognition bits 1 to 1 to the front and rear of the coded information to synthesize a position coded signal, and the second invention provides such a configuration. In addition, a recognition bit detection circuit detects the recognition bit from the position coded signal during playback, and a recognition bit detection circuit that detects the recognition bit from the position coded signal when the recognition bit detection circuit outputs the position coded signal. and a coded information detection circuit for detecting coded information. According to the first invention, it is possible to provide a recording position coded signal generation circuit for measurement data that has a simple circuit configuration and is inexpensive. According to the invention:
It is possible to provide a search system that takes less time to search for the recording position of measurement data, has a simple configuration, and is inexpensive.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing a composite coded signal in the above embodiment. 13- 11... Oscillation circuit, 12... Frequency division circuit, Addition... Coded information generation circuit, 31, 3
2...Recognition bit generation circuit, 33...Composition circuit, 34...Parallel-serial conversion circuit, 35...
...Mixing circuit, 60...Series-parallel conversion circuit,
61...AND gate, 62...Latch circuit. 14-

Claims (2)

[Claims] (1) A coded information generation circuit that generates coded information for position search and a recognition bit generation circuit that generates recognition bits to record at positions equivalent to the recording positions of each measurement data on the recording medium. and a synthesis circuit for adding the recognition bits one before and after the coded information to synthesize a position coded signal. (2) a coded information generation circuit that generates coded information for position search in order to record at a position equivalent to the recording position of measurement data on a recording medium; and a recognition bit generation circuit that generates a recognition bit; a synthesis circuit that adds the recognition bits one before and after the encoded information to synthesize a position coded signal; a recognition bit detection circuit that detects the recognition bit from the position coded signal during playback; and a recognition bit A measurement data recording position search system comprising a coded information detection circuit that detects a portion of the position coded signal excluding the recognition bit as coded information when the detection circuit outputs it.