JP3178111B2 - Input / output control device for VTR control signal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is V to read and write to the VTR
The present invention relates to a control device that inputs and outputs a TR control signal.

[0002]

2. Description of the Related Art In recent years, broadcasting stations and the like have
Or 1 kHz or 1.7 kHz continuous wave or intermittent wave.
The VTR control signal generated is recorded on the tape, and the reproduced V
If the TR control signal is continuous or intermittent,
Depending on this, the VTR is controlled in various ways.
I have. Controller for inputting and outputting such VT R control signal is the mainstream to use an oscillator and a frame signal.

[0003] Hereinafter, the input-output control unit of the conventional VT R control signal will be described. FIG. 2 is a block diagram of the conventional VTR control signal processing. Reference numeral 6 in FIG. 2 denotes a frame signal generation unit for generating and supplying a frame signal. Reference numeral 7 denotes a VTR control signal input / output control unit necessary for a control signal to be output from the VTR to the VTR.
A signal generator 8 generates a signal group composed of continuous waves of a plurality of frequencies. Reference numeral 8 denotes an amplitude component of a control signal input from the VTR to the input / output control device and converts the amplitude to a predetermined amplitude value. 9 is a level extraction unit that outputs an amplitude comparison result by comparing the control signal input from the VTR to the input / output control device into a rectangular wave having the same frequency, and outputs the rectangular wave. The reference numeral 10 denotes a retrigger circuit for adding a retrigger signal to the rectangular wave of the frequency extractor 9 to extend the output pulse width in series, outputting AND of the first retrigger circuit and the second retrigger circuit, and outputting the same. And a waveform selection unit 11 for outputting an AND of the comparison result output from the level extraction unit 8. The waveform selection unit 11 is input from the signal generation unit 7 according to the control of the host controller and the frame signal input from the frame signal generation unit 6. Multiple in switched el frequency switching unit in <br/> frame units composed signal group in a continuous wave, 12 a signal input from the frequency switching unit 11 receives a control whether to output by the control unit This is an output switching unit that switches the output with respect to the VTR.

A conventional processing flow for reading and writing a control signal will be described below with reference to FIG.

First, when a control signal is received from the VTR, the level extractor 8 compares the amplitude of the control signal with a predetermined amplitude, and turns on the signal when the amplitude of the control signal is larger, and turns off the signal when the amplitude of the control signal is smaller. The frequency extracting unit 9 converts the control signal into a rectangular wave having the same frequency. The waveform selection unit 10 inputs the rectangular wave from the frequency extraction unit 9 to the first retrigger circuit and sets the output pulse width to the minimum cycle. Further, the inverter having the output is input to the second retrigger circuit, and the output pulse width is set to the difference between the highest cycle and the lowest cycle. When the outputs of the first retrigger circuit and the second retrigger circuit are ANDed, a rectangular wave is output only at a predetermined frequency. The output and the AND of the comparison result output by the level extraction unit 8 are output to a higher-level control device, and the higher-level control device compares the output with a predetermined pattern on a frame-by-frame basis.
It is classified according to the type of control signal. Next, the signal group from the signal generation unit 7 and the frame signal from the frame signal generation unit 6 are always input to the frequency switching unit 11. Therefore, the frequency switching unit 11 switches the frequency in frame units using the frame signal under the control of the host controller. Under the control of a higher-level control signal, the output switching unit 12 switches the output signal and outputs the output signal to the VTR.

[0006]

However, in the input section, a precise and complicated circuit is required in the frequency extracting section 9 and the waveform selecting section 10, and in the output section, the signal is generated in the frame signal generating section 6 and the signal generating section 7. A circuit and a signal transmission circuit are required, and control by a higher-level control device in frame units is required. Further, the same number of waveform selection units 10 as the frequency of the control signal are required.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a VTR control device in which the number of circuits is reduced and the burden on a host control device is reduced.

[0008]

In order to achieve this object, a VTR control signal input / output device according to the present invention comprises: an element output section for outputting rectangular wave and amplitude information of a staircase wave; A frame management unit for switching on a frame-by-frame basis, a staircase wave creating unit for creating a staircase wave from the rectangular wave and the amplitude information, a frequency extracting unit and a level extracting unit for extracting frequency information and level information of a VTR control signal input from a VTR Unit, a frequency selection unit that selects a frequency corresponding to the frequency information, and a sampling unit that samples the level information and the selected frequency in frame units, the element output unit, the frame management unit, and The frequency selection unit and the sampling unit are provided in one microprocessor.

[0009]

With this configuration, a precision circuit for selecting a waveform in units of frames is not required, and a signal generation source and a signal transmission circuit are not required, thereby reducing the load on the circuit. Further, a wide range of applications can be applied to the control signal, and the burden on the host control device can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of control signal processing according to an embodiment of the present invention. 1 in Figure 1 is the input wave from the VTR
A frequency extraction unit for converting the rectangular wave representing the frequency components, 2 at level extraction unit for outputting a comparison result by comparing the amplitude value of the fixed amplitude of the input wave, 3 to output the staircase A shaping unit for shaping the power signal into a power signal, 4 is a staircase waveform creating unit for creating and outputting a staircase wave from the amplitude information and the square wave as components of the staircase waveform, and 5 is a rectangle input from the frequency extracting unit 1. and the frequency selection of occasional frequency sorting and frame from the comparison result input from the waves and level extraction section 2, and outputs a waveform type of the input wave from the VTR to the host controller, and by the control of the host controller The amplitude representing the element of the instantaneous amplitude of the staircase wave corresponding to the control signal to be output to the VTR
Represents frequency information of width information and staircase wave and has multiple frequencies.
A means for outputting a rectangular wave. The processing of the means 5 is C
It is performed in the PU. Which is a component of the means 5 5A is at any time from the comparison result between the square wave input to the means 5
5B is a frequency selection unit that performs frequency selection of an input wave from the VTR and outputs a selection result, and compares the selection result obtained from the frequency selection unit 5A with a pattern of a VTR control signal on a frame basis to input from the VTR. Which VTR system is the wave
Sampling unit for sorting or control signals, 5C means 5
A control unit for controlling the input / output of the
D is the amplitude of each step of the staircase waveform under the control of the controller 5C.
An element output unit for outputting <br/> a square wave representing the frequency components of the amplitude information and staircase representing the element, 5E and switching of the frequency of the square wave per frame is controlled by the control unit 5C outputs This is a frame management unit that controls switching of whether to perform or not for the element output unit 5D.

FIG. 3 is a timing chart of the staircase wave and the square wave component of the staircase wave introduced as an intermediate state in the present invention. In FIG. 3, 13 to 17 represent five steps each forming a staircase waveform. In the separate configuration levels, 18 to 20 are each rectangular wave edges.

FIG. 4 shows an example of a VTR control signal pattern.
(A) is a pattern of a typical program cue tone as an intermittent wave, and (b) is a pattern of a continuous wave. 400 Hz, 1 kHz and 1.7 kHz are frequently used for this continuous wave. In FIG. 4, reference numeral 21 denotes an ON state where a waveform is output, and reference numeral 22 denotes an OFF state where a waveform is not output.

FIG. 5 shows an example of a table prepared in advance for obtaining the period of the rectangular wave in the frequency selection section 5A. For example, 400 Hz, 1 kHz and 1.7 kHz are used in the control signal, and when the error is set to 10%, six predetermined periods in consideration of the error for the above three types of frequencies are stored in a table. It can be determined period of the rectangular wave by comparing the period value and the rectangular wave in this table. 23 and 24 in FIG. 5 are 40 when the error is 10%.
The highest period and the lowest period that can be determined to be 0 Hz.

The flow of the control signal processing will be described below with reference to FIG. First, when a control signal is read from the VTR, the frequency extraction unit 1 outputs a rectangular wave having the same frequency as the control signal,
The level extraction unit 2 compares the amplitude of the control signal with a predetermined maximum amplitude value and a predetermined minimum amplitude value, and outputs an amplitude comparison result. The frequency selection unit 5A, which receives the rectangular wave and the amplitude comparison result, constantly monitors the edge of the rectangular wave and compares the period of the rectangular wave with the period of the table in FIG. When a signal of 400 Hz is input, the period of the table is larger than that of 23 in FIG. Here, since the period of the rectangular wave is longer than the period of the table, it is determined to be 400 Hz.
Then, the result of the random frequency selection is output to the control unit 5C, and when the result of the random frequency selection is confirmed to be a predetermined period, the sampling unit 5B transmits the VTR control signal at the timing of a frame unit. And outputs a pattern comparison result to the control unit 5C. For example, when it is determined that the frequency is 1.7 kHz in the random frequency selection, the sampling unit 5B checks the result of the random frequency selection and the amplitude comparison result in frame units, and compares the result with the program cue tone pattern shown in FIG. I do. While it is determined in the matching process that the patterns are the same, the control unit 5C is notified of the pattern matching.
B stops. Then, the control unit 5C outputs the above-mentioned random frequency selection result and the above-mentioned comparison result to the host control device.

Next, when a control signal output command is received from the host controller, the control unit 5C determines the V signal according to the type of the output signal.
The pattern of the TR control signal is output to the frame management unit 5E, and the element output unit 5D is operated at the timing of 1/8 cycle of the output control signal. This is because if the above configuration levels are divided into five stages, one cycle is equally divided into eight. Follow
Therefore, the frequency of the rectangular wave output from the element output unit 1B is
400Hz, 1kHz, 1.7kHz each 8 times the frequency
One of the numbers. The element output unit 5D that operates at the above-described timing includes the edge 18, the configuration level 13, and the edge 1
The edge of the rectangular wave and the configuration level to be latched next are output, such as 9 and configuration level 14, and edge 20 and configuration level 15. Then, the frame management unit 5E performs switching so that the rectangular wave output by the element output unit 5D is output in frame units in the ON state 21 and not output in the OFF state 22 according to the pattern described above. The staircase waveform creating unit 4 which has input the level and the square wave which are the components of the staircase wave latches the configuration level 14 at the edge 18, latches the configuration level 13 at the edge 19, and latches the configuration level 14 at the edge 20. I do. In this way, the configuration level input in advance at the edge of the rectangular wave is latched to create a staircase wave. The staircase waveform is converted to VT by the shaping unit 3
It is shaped into a VTR control signal having a smooth waveform to be output to R.

Therefore, a plurality of continuous waves and intermittent waves can be realized by adjusting the timing and creating the table of the pattern. As described above, the circuit can be eliminated and the burden on the host controller can be reduced, which is extremely advantageous.

If the frequency of the rectangular wave is doubled by performing an XOR operation on the rectangular wave output from the element output unit 5D, the counter value can be doubled when an interrupt is generated by the element output unit 5D. The burden on the unit 5D is reduced by half.

[0019]

As described above, the VTR control device of the present invention is
The circuit can be reduced, and the load on the host controller can be reduced, such as comparison with pattern data in frame units at the time of input and switching operation of frame units at the time of output, and processing of multiple continuous signals and intermittent signals can be performed. This is very advantageous because there is flexibility in changing the processing signal.

[Brief description of the drawings]

FIG. 1 is a block diagram of a process of the present invention in a VTR control device.

FIG. 2 is a block diagram of a conventional process.

FIG. 3 is a timing chart of a square wave as a staircase wave.

FIG. 4 is a pattern diagram of a VTR control signal.

FIG. 5 is a diagram of a frequency selection table.

FIG. 6 is a related diagram of constituent means of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Frequency extraction part 2 Level extraction part 3 Shaping part 4 Staircase waveform creation part 5 Output part of amplitude and rectangular wave which is a structure of staircase wave corresponding to control signal selection and control signal 5A Frequency selection part 5B Sampling part 5C Control part 5D Amplitude and rectangular wave element output unit 5E Output frame management unit 6 Frame signal generation unit 7 Signal generation unit 8 Input signal amplitude comparison result extraction unit 9 Input signal frequency selection extraction unit 10 Waveform selection based on frequency selection and amplitude comparison Unit 11 Output signal switching unit 12 Output switching unit 13 Staircase waveform configuration level 14 Staircase waveform configuration level 15 Staircase waveform configuration level 16 Staircase waveform configuration level 17 Staircase waveform configuration level 18 Rectangular wave edge 19 Rectangular wave edge 20 Rectangular wave edge 21 Signal OK State 22 Signal OFF state 23 Maximum cycle 24 Minimum cycle

Claims (1)

(57) [Claims] 1. A plurality of frequencies representing frequency components of a staircase wave
An element output unit for outputting the <br/> amplitude information representing the amplitude component of each period of the square wave and the staircase with, frequency of the square wave
Frame that switches the number and ON / OFF in frame units
And-management unit, a staircase wave generating unit configured to generate a staircase waveform as VTR control signal for outputting the switched rectangular-wave amplitude information whether to <br/> et VTR, VTR control input from VTR
A frequency extractor for extracting frequency information of the signal, the VT
Extract level information of VTR control signal input from R
A level extraction unit and a plurality of VTR control signal frequencies
The frequency corresponding to the frequency information from the frequency extraction unit is
A frequency selection unit to be selected, and a level from the level extraction unit.
Information and the selected frequencies are framed in units of frames.
And a sampling unit for sampling, said element output
Unit and the frame management unit are one microprocessor.
Installed in the transmitter, continuous or intermittent at multiple frequencies
Process to create a typical staircase wave, and
The separate unit and the sampling unit are the microprocessor
And a VTR control signal input from the VTR.
Process to determine which frequency the signal is continuous or intermittent.
An input / output control device for a VTR control signal.