JPH06103646A - Input/output controller for vtr control signal - Google Patents

Abstract

PURPOSE:To reduce circuits and to reduce the burden on a host controller by processing a means for outputting the frequency information and the amplitude information of step-waves, the means for performing classification for the respective kinds of control signals and a control means with one microprocessor. CONSTITUTION:A frequency selection part 5A selects frequencies at all times from rectangular waves from a frequency extraction part 1 and a compared result from a level extraction part 2 and outputs a selected result. A sampling part 5B selects waveforms by comparing the selected result obtained from the frequency selection part 5A with the pattern of the control signal by a frame unit. A component output part 5D receives the control of a control part 5C and outputs the amplitude and the rectangular waves as the components of step-waveforms. A frame management part 5E controls the component output part 5D for the changeover of the rectangular waves by the frame unit and the changeover of whether to output or not. This processing of the respective components is performed by a CPU 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control signal input / output control device for reading / writing a VTR.

[0002]

2. Description of the Related Art In recent years, an input / output control device for a VTR control signal mainly uses an oscillator and a frame signal.

A conventional VTR control signal input / output control device will be described below. FIG. 2 is a block diagram of conventional VTR control signal processing. Reference numeral 6 in FIG. 2 is a frame signal generator for generating and supplying a frame signal, 7 is a signal generator for generating a continuous wave required for a control signal output from the VTR control signal input / output control device to the VTR, and 8 is a VTR. Is a level extraction unit for extracting the amplitude component of the control signal input to the input / output control device, comparing the amplitude with a predetermined amplitude value, and outputting an amplitude comparison result. Reference numeral 9 denotes the input / output from the VTR. In the frequency extraction unit that converts the control signal input to the control device into a rectangular wave having the same frequency and outputs the rectangular wave,
0 is a series of retrigger circuits that extend the output pulse width by adding a retrigger signal to the rectangular wave of the frequency extractor 9 to output AND of the first and second retrigger circuits and extract the output and level. A waveform selection unit for outputting the AND of the comparison result output by the unit 8 is a frame unit of the signal group 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. Is a frequency switching unit for switching and outputting, and 12 is an output switching unit for switching the output to the VTR under the control of whether the signal input from the frequency switching unit 11 is output by the control device. .

A conventional process flow for reading and writing control signals will be described below with reference to FIG.

First, when the control signal is received from the VTR, the level extraction unit 8 compares the amplitude of the control signal with a predetermined amplitude and turns the signal ON when the amplitude of the control signal is larger and turns it OFF when the amplitude of the control signal is smaller. The frequency extraction unit 9 converts the control signal into a rectangular wave having the same frequency. The waveform selection unit 10 inputs the rectangular wave of the frequency extraction unit 9 into the first retrigger circuit and sets its output pulse width to the minimum period. Further, the output inverter is input to the second re-trigger circuit to set the output pulse width to the difference between the maximum period and the minimum period. Then, 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 the upper control device, and the upper control device compares with a predetermined pattern on a frame-by-frame basis, and the VTR is calculated from the comparison result.
Classify by type of control signal. Next, the signal group from the signal generator 7 and the frame signal from the frame signal generator 6 are constantly input to the frequency switching unit 11. Therefore, the frequency switching unit 11 is controlled by the host controller to switch the frequency using the frame signal. The output switching section 12 outputs the output signal to the VTR under the control of the higher-order control signal.

[0006]

However, in the input section, the frequency extraction section 9 and the waveform selection section 10 require precise and complicated circuits, and in the output section, the frame signal generation section 6 and the signal generation section 7 generate signals. In addition to the need for circuits and signal transmission circuits, control by the host controller on a frame-by-frame basis is required. Further, the same number of waveform selection units 10 as the frequency of the control signal is required.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a VTR control device in which the number of circuits is reduced and the load on the host control device is small.

[0008]

To achieve this object, the VTR controller of the present invention incorporates a stepped waveform corresponding to a sine wave to be output as an intermediate state. 6, means for outputting a rectangular wave and an amplitude component which are frequency components of the staircase waveform, means for controlling the means on a frame-by-frame basis, means for creating a staircase waveform, means for shaping the waveform, and input A means for extracting a rectangular wave which is a frequency component of a wave, a circuit for extracting the amplitude of an input wave, and a frequency selection based on the rectangular wave and the amplitude and sampling for each frame to classify the control signals by type. And means for controlling all the above means.

[0009]

With this configuration, a precision circuit for selecting waveforms in frame units is not required, and a signal generation source and a signal transmission circuit are not required, which reduces the load on the circuit. In addition, it can be applied to a wide range of control signals, and the burden on the host controller 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. Reference numeral 1 in FIG. 1 is a frequency extraction unit that outputs a rectangular wave that is a frequency component of an input wave, 2 is a level extraction unit that compares the amplitude of the input wave with a fixed amplitude value, and outputs a comparison result, and 3 is a staircase. A shaping unit for shaping a wave into a control signal to be output, 4 is a staircase waveform creating unit for creating and outputting a staircase wave from the amplitude and a rectangular wave which are components of the staircase waveform, and 5 is input from the frequency extracting unit 1. Rectangular wave and level extraction unit 2
From the comparison result input from, the frequency selection and the frequency selection for each frame are performed at any time, the waveform type is output to the upper control device, and the component of the staircase waveform corresponding to the control signal to be output by the control of the higher control device is used. It is a means for outputting a certain amplitude and a rectangular wave. The processing of the means 5 is performed in the CPU. Reference numeral 5A, which is a constituent element of the means 5, is a frequency selection section for performing frequency selection from the rectangular wave input to the means 5 and the comparison result as needed and outputting the selection result. 5B is a frequency selection section 5
A sampling unit for performing waveform selection by comparing the selection result obtained from A with the pattern of the control signal in frame units, 5C is a control unit for controlling the input / output of the unit 5 and the operation of the entire unit 5, and 5D is An element output unit that outputs the amplitude and the rectangular wave which are the components of the staircase waveform under the control of the control unit 5C, and 5E is controlled by the control unit 5C to switch or output the rectangular wave for each frame. Is a frame management unit that controls the switching of the element output unit 5D.

FIG. 3 is a timing diagram of a staircase wave and a rectangular wave of the staircase wave component incorporated as an intermediate state in the present invention. 13 to 17 in FIG. At the separated configuration levels, 18 to 20 are each edges of a rectangular wave.

FIG. 4 shows an example of a VTR control signal pattern.
(A) is a typical program cue tone pattern as an intermittent wave, and (b) is a continuous wave pattern. 400 Hz, 1 kHz and 1.7 kHz are frequently used for this continuous wave. Reference numeral 21 in FIG. 4 is an ON state in which a waveform is output, and 22 is an OFF state in which no waveform is output.

FIG. 5 shows an example of a table prepared in advance for obtaining the period of the rectangular wave in the frequency selection unit 5A. For example, 400 Hz, 1 kHz, and 1.7 kHz are used in the control signal, and when the error is 10%, six predetermined cycles considering the error for the above three types of frequencies are stored in the table. The period of the rectangular wave can be obtained by comparing the values in this table with the period of the rectangular wave. 23 and 24 in FIG. 5 are 400 when the error is 10%.
It is the highest cycle and the lowest cycle that can be determined as Hz.

The flow of control signal processing will be described below with reference to FIG. First, when the 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, to which the rectangular wave and the amplitude comparison result are input, constantly monitors the edge of the rectangular wave and compares the period of the rectangular wave with the period of the table of FIG. 5 to perform frequency selection at any time. When a signal of 400 Hz is input, the cycle 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 occasional frequency selection is output to the control unit 5C, and when the result of the occasional frequency selection is confirmed to be a predetermined cycle, the sampling unit 5B causes the VTR control signal to be generated at the frame unit timing. The pattern comparison result is output to the control unit 5C. For example, if it is determined that the frequency is 1.7 kHz by the frequency selection, the sampling unit 5B checks the result of the frequency selection and the amplitude comparison result on a frame-by-frame basis and collates the pattern with the program cue tone pattern shown in FIG. To do. The pattern matching is notified to the control unit 5C while it is determined that they are the same in this matching processing, and when it is determined that there is no matching, the sampling unit 5
B stops. Then, the control unit 5C outputs the above frequency selection result and the above comparison result to the host controller at any time.

Next, when a control signal output command is received from the host controller, the control section 5C outputs 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 ⅛ cycle of the output control signal. This is because one cycle is divided into eight equal parts when the above-mentioned configuration level is divided into five steps. The element output unit 5D operating at the above timing includes the edge 18, the configuration level 13, the edge 19, the configuration level 14, the edge 2
It outputs the edge of the rectangular wave and the configuration level to be latched next, such as 0 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 on a frame-by-frame basis in the ON state 21 and not in the OFF state 22 according to the above pattern. The staircase waveform creating unit 4 to which the level and the rectangular wave, which are the constituent elements of the staircase wave, are input, 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. To do. In this way, the staircase wave is created by latching the constituent level that was previously input at the edge of the rectangular wave. The staircase wave is shaped by the shaping unit 3 into a control signal for outputting a staircase waveform.

Therefore, a plurality of continuous waves and intermittent waves can be realized by adjusting the timing and creating the table of the above pattern. In this way, the circuit can be deleted and the load on the host controller can be reduced, which is extremely advantageous.

If the frequency of the rectangular wave is doubled by XORing the rectangular wave output from the element output unit 5D, the counter value can be doubled when the interrupt is applied at the element output unit 5D. The load on the part 5D is halved.

[0019]

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

[Brief description of drawings]

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

FIG. 2 is a block diagram of conventional processing.

[Fig.3] Timing diagram of staircase wave and rectangular 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]

1 frequency extraction unit 2 level extraction unit 3 shaping unit 4 staircase waveform generation unit 5 control signal selection and amplitude and rectangular wave output unit that is the configuration of the staircase wave corresponding to the control signal 5A frequency selection unit 5B sampling unit 5C control unit 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 Frequency selection and amplitude comparison waveform selection Part 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 period 24 Minimum period

Claims (1)

[Claims] 1. A means for outputting frequency information and amplitude information of a staircase wave, a means for controlling whether to output to the means in frame units, and a staircase wave from the frequency information and the amplitude information. A means for creating, a means for shaping a staircase wave into a control signal, a means for extracting frequency information of an input wave, a means for extracting amplitude information of an input wave, and a division by frequency based on the frequency information and the amplitude information. Means, a means for classifying the result and the timing of each frame according to the type of the control signal, a means for controlling all the means, and means for outputting the frequency information and the amplitude information of the staircase waveform, and A VTR control signal characterized by processing a unit for classifying an input wave according to the type of control signal and a control unit for a plurality of continuous signals and intermittent signals with a single microprocessor. Input and output control unit.