JP3175318B2 - 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 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. Control apparatus for outputting such VT R control signal is the mainstream to use an oscillator and a frame signal.

[0003] Hereinafter, the output control apparatus of a conventional VT R control signal will be described. FIG. 2 is a block diagram of the conventional VTR control signal processing. Reference numeral 4 in FIG. 2 denotes a frame signal generation unit for generating and supplying a frame signal. Reference numeral 5 denotes a plurality of control signals necessary for a control signal output from the VTR control signal output control device to the VTR.
6 is a signal generator for generating a signal group composed of continuous waves having the frequencies of: a plurality of frequencies input from the signal generator 5 based on the control of the host controller and the frame signal input from the frame signal generator 4 Signal group composed of continuous waves
In switched El frequency switching unit in units of frames, and 7 is the output switching unit for switching between outputting a signal input from the frequency switching unit 6 with respect to VTR receives the control whether to output by the control unit .

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

First, a signal group from the signal generator 5 and a frame signal from the frame signal generator 4 are always input to the frequency switching unit 6. Therefore, the frequency switching unit 6
Is controlled by the host controller and uses the frame signal to
The frequency is switched in frame units . Under the control of the higher-level control signal, the output switching unit 7 switches the output signal and outputs the output signal to the VTR.

[0006]

However, the frame signal generator 4 and the signal generator 5 require a signal generation circuit and a signal transmission circuit, and also require control by a higher-level control device for each frame.

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]

Means for Solving the Problems] output control unit of the VTR control signal of the present invention in order to achieve the object, a rectangular wave
An element output unit for outputting amplitude information of the staircase wave, and the rectangle
A frame management unit for switching waves in frame units;
A staircase wave creation unit that creates a staircase wave from the shape wave and the amplitude information
Wherein the element output unit and the frame management unit are
In one microprocessor

[0009]

With this structure, 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. 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 of FIG. 1 shows the instantaneous amplitude of the staircase wave corresponding to the control signal to be output under the control of the host controller .
The amplitude information that represents the element and the frequency element of the staircase wave
Continuous means for outputting a rectangular wave having a frequency of 2 in step-like waveform generating unit configured to generate a staircase waveform from the amplitude information and the rectangular wave, 3 is a control signal to be output staircase waveform
It is a shaping unit that shapes waves . The processing of the means 1 is performed in the CPU. 1A which is a component of the means 1 is a control unit for controlling the input / output of the means 1 and the operation of the whole means 1.
Is an element output section that outputs amplitude and a rectangular wave which are components of the staircase waveform under the control of the control section 1A.
And controls the switching of whether or not to output the rectangular wave frequency in frame units to the element output unit 1B.

FIG. 3 is a timing chart of the staircase wave introduced as an intermediate state in the present invention and the square wave of the constituent elements of the staircase wave. FIGS. In the separate configuration levels, 13 to 20 are each the edges of a square wave.

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. 4 is an ON state where a waveform is output.
Reference numeral 22 denotes an OFF state in which no waveform is output.

The flow of control signal processing will be described below with reference to FIG. First, when a control signal output command is received from the host controller, the control unit 1A outputs the pattern of the VTR control signal to the frame management unit 1C according to the type of the output signal, and the timing of the 1/8 cycle of the output control signal And element output section 1B
To work. This is because if the above configuration levels are divided into five stages, one cycle is equally divided into eight. Therefore, the element
The frequency of the rectangular wave output from the power unit 1B is 400H
z, 1 kHz, 1.7 kHz
Either. The element output unit 1B that operates at the above-mentioned timings includes edge 13 and configuration level 8, edge 14 and configuration level 9, edge 15 and configuration level 10, edge 16 and configuration level 11, edge 17 and configuration level 12, and edge 1
8 and the configuration level 11, the edge 19 and the configuration level 10, the edge 20 and the configuration level 9, and output the edge of the rectangular wave and the configuration level to be latched next. Then, the frame management unit 1C performs switching so that the rectangular wave output from the element output unit 1B 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 2 which inputs the level and the square wave, which are the components of the staircase wave, latches the configuration level 9 at the edge 13, latches the configuration level 8 at the edge 14, and latches the configuration level 9 at the edge 15. And edge 16
Latches configuration level 10 at edge 17, latches configuration level 11 at edge 17, latches configuration level 12 at edge 18, latches configuration level 11 at edge 19, and edge 2
At 0, the configuration level 10 is latched. In this way, the configuration level input in advance at the edge of the rectangular wave is latched to create a staircase wave. Shaping the staircase to VTR control signals smooth waveform to be output staircase waveform VTR in shaping unit 3.

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 rectangular wave output from the element output unit 1B is XORed and the frequency of the rectangular wave is doubled, the counter value can be doubled when an interrupt is generated at the element output unit 1B. The burden on the unit 1B is reduced by half.

[0017]

As described above, the VTR control device of the present invention is
Circuits can be reduced, and the load on the host controller can be reduced, such as by synchronizing frame signals with input / output signals, comparing pattern data in frame units at input, and switching frame units at output. This is very effective because it can process continuous or intermittent signals, and has flexibility in changing the processed 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 staircase wave and a square wave.

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

FIG. 5 is a related diagram of constituent means of the present invention.

[Explanation of symbols]

1 Output of amplitude and rectangular wave which is a configuration of staircase wave corresponding to control signal 1A Control unit 1B Output of amplitude and rectangular wave 1C Frame management for output 2 Create staircase wave 3 Shape staircase wave into control signal 4 Output frame signal 5 Signal generation 6 Output signal switching 7 Output switching 8 Staircase waveform configuration level 9 Staircase waveform configuration level 10 Staircase waveform configuration level 11 Staircase waveform configuration level 12 Staircase waveform configuration level 13 Rectangular wave edge 14 Rectangular wave edge 15 Rectangular wave edge 16 Rectangular wave Edge 17 Rectangular wave edge 18 Rectangular wave edge 19 Rectangular wave edge 20 Rectangular wave edge 21 Signal ON state 22 Signal OFF state

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
Comprising a-management unit, and 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, the said element output unit off
Frame management unit is provided in one microprocessor
Continuous or intermittent staircase waves of multiple frequencies
An output control device for a VTR control signal, wherein the output control device performs a process to create a VTR.