KR920002087B1 - For common servo system vtr and dat (digital audio tape) - Google Patents

Abstract

The servo system is used by a 4 mm VTR and a digital audio tape driver integrated inone body. The servo system includes a function selection switch (10) for selecting operation modes and functions of a DAT and a VTR, a reference frequency generator (30) for generating reference data of a DAT and a VCR according to servo data transmitted from a microcomputer (20), a controller (40) for generating motor drive signal according to the modes and the function selected by function keys and comparing frequency generated by rotation of a motor with reference frequency to generate error correction signal (e), a gain adjuster (50) for adjusting servo gains, a switch (SW) for selecting a DAT servo unit or a VTR servounit and a frequency generator (90) for generating rotating frequency of the motor and transmitting to the controller (40).

Description

Common servo system with 4mm VTR and DAT

1 is a block diagram of the present invention.

2 is a flowchart showing an example of a control program executed in the controller of the system of the present invention.

* Explanation of symbols for main parts of the drawings

10: function selector switch 20: microcomputer

30: reference frequency generator 40: controller

50: servo gain adjustment unit 60: motor drive unit

70: motor 80: speed phase detection and amplification unit

90: comparison frequency generator

The present invention relates to a common servo system of a digital audio tape recorder (hereinafter referred to as DAT) and a 4 mm video tape recorder (hereinafter referred to as VTR).

In general, audio equipment and video equipment have been developed and sold for a separate commercial purpose, but recently, research on products in which audio equipment and video equipment are integrated has been actively conducted.

In particular, DAT, a digital sound device, is a device for recording and reproducing a digital signal by a rotating head, and its structure is similar to that of a VTR using a rotating drum, but none of the above two products are formed and commercialized.

The present invention focuses on the structural similarity between the two products, and provides a DAT and a 4mm VTR common servo system configured to perform a function according to a user's selection by combining an audio device and a video device in one main body. For that purpose.

In order to achieve the above object, the present invention uses a deck of DAT in common, and rotates the number of revolutions of the drum and capstan motors of the DAT and the 4mm VTR according to the specifications of the DAT and the 4mm VTR, respectively. In order to realize a device that operates in.

Hereinafter, the present invention will be described in detail.

First, in order to configure the DAT and 4mm VTR as a set, the DAT mechanism and the 4mm VTR mechanism must be matched with each other. To control this, the DAT and the 4mm VTR are configured as one servo system.

Therefore, the conditions and specifications for configuring the DAT and the 4mm VTR as one set appear, and the present invention system adopts the conditions and specifications shown in Tables 1 and 2 below.

TABLE 1

TABLE 2

Table 1 is commonly applied to DAT and 4mm VTR, and Table 2 is applied according to the mode when selecting DAT or 4mm VTR. Based on the above conditions, the deck part is commonly designed and some specific parts of the servo system are used. The DAT circuit part and the 4mm VTR circuit part are designed in separate structures to be combined in one set.

That is, Table 1 and Table 2 are bonded 4mm VTR servo standard to the DAT standard.

Hereinafter, the configuration and signal application state of the present invention will be described with reference to the block diagram of the present invention shown in FIG.

The configuration of the common servo system of the 4mm VTR and DAT of the present invention in FIG. 1 includes a function selection switch unit 10 for selecting various functions including an operation mode of either DAT or 4mm VTR, and the function selection switch. Microcomputer 20 for generating a servo data signal S including a reference frequency and various control signals according to the selection function of the section 10, and DAT standard reference according to the servo data from the microcomputer 20. A reference frequency generator 30 for outputting data or 4mm VTR standard reference data, and reference data from the reference frequency generator 30, and a mode selected according to selection of various function keys such as a playback or recording key. And a controller 40 for outputting a motor driving signal according to an operation function and outputting an error correction signal e by comparing a comparison frequency according to motor rotation with a preset reference frequency. The servo gain section includes a servo gain section for 4 mm VTR and a servo gain adjusting section 50 for adjusting the servo gain according to a selection mode, and the servo gain according to the mode selection of the function selection switch section 10. A switch SW for selecting the DAT servo gain unit of the adjusting unit 50 or the servo gain unit for the 4mm VTR, and the drum and capstan motor 70 of any one of DAT and 4mm VTR connected to the switch SW. ) According to the detection signal of the speed / phase detection and amplification unit 80 to detect and amplify the motor driver 60 for driving the motor and the speed / phase according to the rotation of the motor 70 from the motor 70. Comprising a frequency generation unit 90 for generating a frequency applied to the controller 40.

Furthermore, the controller 40 has a built-in speed and phase control program for DAT and 4mm VTR as shown in FIG. 2 to separately control the control program according to the selection mode.

The operation of the circuit of the present invention having the above configuration will be described in detail.

When the DAT or 4mm VTR is selected by the user in the function selection switch unit 10, the microcomputer 20 for controlling the whole system can perform recording, playback, etc. according to the selection mode of the function selection switch unit 10. Generate the servo data signal (S).

Accordingly, the reference frequency generator 30 applies reference data according to the selection mode, for example, a control reference frequency and various servo control serial or parallel signals to the motor control controller 40 to be stored in the controller 40.

In this case, when the recording or playback key is selected and input, the controller 40 applies a control signal to the motor driving unit 60 through the servo gain adjusting unit 50 to drive the motor 70, thereby matching the drum according to each mode and function. And the capstan will rotate the specified speed.

In addition, the motor 70 maintains a constant speed by the speed and phase control, which is proportional to the rotational speed of the motor 70 in the comparison frequency generator 90 through the speed phase detection and amplification unit 80. By applying the comparison frequency to the controller 40, the motor error correction signal (e) by comparing the reference frequency applied from the reference frequency generator 30 and stored in the controller 40 with the comparison frequency in the controller 40. ) Is applied to the servo gain adjustment unit 50.

2 is a flowchart showing an example of a drum motor control program executed in the controller 40 of the system of the present invention.

In the controller 40, when the DAT or 4mm VTR is selected, the drum is turned on, and the reference frequency and the comparison frequency are compared to check whether the rotation speed is within a certain range, adjust the speed bias, and count the speed error to obtain a constant speed. After that, check if the speed is within wide range and then perform phase control.

In phase control, it checks whether the phase is within the control range, adjusts the phase bias, and locks the servo to maintain a constant level if the phase bias is within a predetermined range.

That is, when DAT or 4mm VTR is selected in the flowchart of FIG. 2, the reference servo data is applied from the microcomputer 20 to the controller 40 as digital data of a reference speed frequency (800 Hz in the case of DAT) corresponding thereto. (40) The measurement is started by the internal register, and the comparison is made with the comparison frequency corresponding to the rotational speed to determine whether the difference is within the speed range, and the stable rotational speed and It has a phase.

In addition, in the control program such as the flowchart, a control program corresponding to each of the DAT and the 4mm VTR is built in the controller 40, and the speed, the phase control reference, and the measurement circuit are separately divided into the DAT and the 4mm VTR, respectively, to provide two types of surges. The beam control is controlled by the controller 40. In the motor control method, the wide range control is set to speed control and the precision control is configured to be in charge of phase control.

As described above, according to the system of the present invention, a new product that can enjoy sound and video in the same set can be provided by configuring the digital sound apparatus DAT and the video recording and reproducing apparatus 4mm VTR as one system.

Claims (2)

Servo data including a function selection switch unit 10 for selecting various functions including an operation mode of either DAT or 4mm VTR, and reference frequencies and various control signals according to the selection function of the function selection switch unit 10. A microcomputer 20 for generating a signal S, a reference frequency generator 30 for outputting DAT standard reference data or 4mm VTR standard reference data according to the servo data from the microcomputer 20, Stores reference data from the reference frequency generator 30, outputs a motor drive signal according to a selected mode and operation function according to selection of various function keys, compares frequency according to motor rotation, and a preset reference frequency And a controller 40 for outputting an error correction signal e, a servo gain section for the DAT, and a servo gain section for the 4mm VTR. Connected to the switch SW for selecting the servo gain adjusting unit 50 for determining the position, the switch SW for selecting the servo gain unit for the mode DAT, or the servo gain unit for the 4mm VTR of the function selection switch unit 10; Motor for driving the drum 70 of any one of the DAT and the 4mm VTR and the capstan motor 70, and for detecting and amplifying the speed and phase according to the rotation of the motor 70 from the motor 70. A speed and phase detection and amplification section 80, and a comparison frequency generating section 90 for generating a comparison frequency according to the detection signal of the speed and phase detection and amplification section 80 and applying it to the controller 40. The common servo system of 4mm VTR and DAT. 2. The common surge of 4mm VTR and DAT according to claim 1, wherein the controller 40 performs speed control first using the comparison frequency from the comparison frequency generator 90, and phase control after speed control. Beam system.

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