KR960005131B1 - Progressing status display apparatus and method of recording media - Google Patents

Abstract

The objective of this is to provide indicating method and apparatus which can indicate the progressing amount of recording media by counting the progressing amount accurately. The apparatus comprises: a micom(10) for controlling system; a head(11) for extracting control pulse array recorded on a recording media and for recording control pulse to the recording media; a servo control part(12) which controls the recording media run by the control pulse inputted from the head when playing and that provides control pulse array when recording under the control of the micom; a wave shape rectifying part(13) which transmits the control pulse array inputted from the servo control part to the servo control part and the micom by rectifying the control pulse array inputted from the header after transmitting the control pulse array to the head when recording by being connected among the servo control part, the head and the micom; a counter(14) which counts the record amount of the recording media under the control of the micom(10).

Description

Apparatus and method for indicating progress of recording medium

1 is a circuit diagram of a conventional reel counting device.

2 is an output waveform diagram of each part of the apparatus shown in FIG.

3 is a circuit diagram of an embodiment with an apparatus of the present invention.

4 is an output waveform diagram of each part of the circuit shown in FIG.

5 is a flowchart of an embodiment according to the method of the present invention.

* Explanation of symbols for main parts of the drawings

10: Micom 11: Head

12: servo control unit 13: waveform shaping unit

14: counter

The present invention relates to an apparatus and method for displaying the amount of progress of a recording medium by a control pulse train recorded on the recording medium in a recording and reproducing apparatus.

In general, a recording and reproducing apparatus refers to a device for recording information on a recording medium or reproducing information recorded on a recording medium. The recording and reproducing apparatus includes a video tape recorder (hereinafter referred to as a VTR) using a tape as a recording medium. And optical disk players or general disk recorders that use a variety of cassette tape recorders and disks, including digital audio tape recorders and digital audio tape recorders. Etc.

The recording and reproducing apparatus has a function of displaying the amount of progress of the recording medium using a control pulse recorded on the recording medium for the convenience of the user when reproducing the recording medium or searching for specific information recorded on the recording medium.

Referring to the accompanying drawings, a conventional technique for displaying the progress of the recording medium is as follows.

FIG. 1 is a circuit diagram of a conventional progress indicator of a recording medium, and FIG. 2 is an output waveform diagram of each part of the circuit shown in FIG.

The head 11 reads the control pulse of the waveform as shown in FIG. 20 from the recording medium during reproduction or forward high speed driving of the recording medium, and supplies it to the waveform shaping section 13. 2 The control pulse of the waveform shown in FIG. 21 is read out and supplied to the waveform shaping part 13. The waveform shaping unit 13 for introducing the control pulses regenerated from the head 11 supplies the shaped control pulse trains having the waveforms as shown in FIG. 22 to the servo control unit 12 during regeneration or in the forward high speed driving. When traveling, the shaped control pulse train having the waveform as shown in FIG. 23 is supplied to the servo controller 12. The servo control unit 12 which introduces the control pulse train shaped from the waveform shaping unit 13 may include a second control pulse train that is input during regeneration and a high speed driving, such as a second control 22, or a reverse control that is input during the reverse high speed driving. Regardless of the control pulse train as shown in FIG. 23, the duty ratio is adjusted to always supply the control pulse train having a constant duty ratio to the microcomputer 10 as shown in FIG. 24. Then, the microcomputer 10 applies a count pulse to the counter 14 whenever the control pulse of the control pulse string drawn from the servo control unit 12 becomes a certain number so that the counter 14 adds or subtracts the count. The addition or addition count operation of the counter 14 is controlled by the microcomputer 10, and the microcomputer 10 is controlled according to the operation mode (i.e., regeneration mode, forward fast driving mode or reverse fast driving mode) currently being controlled. The addition or subtraction count mode of the counter 14 is specified.

However, in the apparatus shown in FIG. 1, a case in which the progress amount of the recording medium that differs from the actual progress of the recording medium is counted and displayed may occur. For example, as shown in FIG. When the user selects the stop mode to stop the recording medium while the recording medium is in the forward high speed driving state, the microcomputer 10 moves the capstan for driving the tape through the servo controller 12 to stop the recording medium quickly. Even if the controller is controlled to rotate in reverse high speed, the capstan decelerates the forward running of the recording medium by inertia, but does not stop suddenly. In this case, the microcomputer 10 causes the counter 14 to subtract by the control pulse drawn from the servo control unit 12 in the reverse high speed driving mode under control, thereby advancing the recording medium as opposed to the actual moving direction of the recording medium. The amount is counted.

That is, there was a problem in that the amount of progress of the recording medium could not be properly counted during the period in which the loading control state of the recording medium and the actual recording medium progressed when the operation mode was switched.

Accordingly, an object of the present invention is to provide a progress display apparatus for a recording medium and a progress status display method for a recording medium capable of accurately counting and displaying the progress amount of the recording medium in the recording and reproducing apparatus.

In order to achieve the above object, the apparatus of the present invention comprises a micom for controlling the system, a head for recording a control pulse on a recording medium or reading a control pulse train recorded on the recording medium, and when recording under the control of the micom, A servo control unit which supplies a control pulse train to the head and controls the running of the recording medium by a control pulse drawn from the head during reproduction; and is connected between the servo control unit and the head and the micom and the servo control unit when recording. And a waveform shaping unit for transferring the control pulse train drawn from the head to the head, and in other cases, the waveform shaping of the control pulse train drawn from the head to the servo control unit and the micom, and the recording medium under the control of the microcomputer. It is characterized by comprising a counter for counting the amount of travel.

In addition, the method of the present invention applied to the apparatus in order to achieve the above object is a traveling direction detection process for detecting the traveling direction of the recording medium by the duty ratio of the control pulse, and the recording medium is forward running in the traveling direction detection process If the number of control pulses received when the number of the detected control pulses is a certain number, the addition counting process of adding the counting amount of the recording medium and the number of control pulses if the recording medium is detected to travel in the reverse direction determination process It is characterized in that it comprises a subtraction counting process of subtracting the progress of the recording medium when the.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a circuit diagram of an embodiment according to the apparatus of the present invention, which counts and displays the amount of progress of a tape, which is a recording medium in a VTR.

The microcomputer 10 controls the overall circuit of the VTR system, the head 11 records the control pulse on the tape or reads the control pulse recorded on the tape, and the servo controller 12 controls the microcomputer 10 of the microcomputer 10. A control pulse train is supplied to the head during recording under control, and the running of the tape is controlled by a control pulse train drawn from the head 11 during reproduction. The waveform shaping unit 13 is connected between the head 11 and the servo control unit 12 and the microcomputer 10 to waveform-shape the control pulse string introduced from the servo control unit 12 during recording. The supplied control pulses (11) are subjected to waveform shaping of the regenerated control pulse trains drawn from the head (11) during regeneration, forward high speed driving or reverse high speed driving, and supplied to the servo control unit (12) and the microcomputer (10). The counter 14 adds or subtracts the running amount of the tape under the control of the microcomputer 10 to display the counter.

4 is an output waveform diagram of the head 11 and the waveform shaping unit 13 in the apparatus shown in FIG. 3, in which 40 is an output waveform diagram of the head 11 when the tape is traveling forward, and 41 is a tape. Is an output waveform diagram of the head 11 when driving in the reverse direction, 42 is an output waveform diagram of the waveform shaping unit 13 when the tape runs in the forward direction, and 43 is an output waveform diagram of the waveform shaping unit 13 when the tape runs in the reverse direction.

FIG. 5 is a flowchart of an embodiment according to the method of the present invention performed by the microcomputer 10 of the apparatus shown in FIG.

The process of determining the direction is made of steps 50 and 51, the addition counting process is made of the 52nd to S54 stages, and the subtraction counting process is made of the 55th to 57th stages. The operation of the apparatus shown in FIG. 1 is then described in detail in conjunction with the fourth diagram according to the flowchart shown in FIG.

In step 50, the microcomputer 10 sets an input terminal connected to the waveform shaping unit 13 and an output port connected to the counter 14.

After the 50th step, the microcomputer 10 checks whether the duty ratio for the high logic period of the control pulse flowing into the set input terminal is a certain percentage (for example, 60%) to detect whether the tape is running in the forward direction or the reverse direction. (Step 51)

The head 11 reads the control pulse of the waveform as shown in FIG. 40 from the tape when the tape is traveling in the forward direction, i.e., during playback or in the forward high-speed driving, while the tape is traveling in the reverse direction, i.e. A control pulse train as shown in FIG. 41 is read out from the tape.

In addition, when the tape is traveling in the forward direction, the waveform shaping unit 13 performs waveform shaping on the control pulse train of the waveform as shown in FIG. 40 when the tape is traveling in the forward direction. As shown in FIG. The control of the waveform as shown in FIG. 41 which is supplied from the head 11 when the control pulse train having a ratio of 60% is supplied to the microcomputer 10 and the servo controller 12 while the tape is traveling in the reverse direction. By shaping the pulse train, the shaped control pulse train of 40% duty ratio in the high logic period is supplied to the microcomputer 10 and the servo controller 12 as shown in FIG.

Then, the microcomputer 10 controls the counter 14 which counts the amount of progress of the tape according to the duty ratio and the quantity of the control pulse train supplied from the waveform shaping unit 13, and according to the flowchart shown in FIG. 5. The explanation is as follows.

In step 51, when the duty ratio of the control pulse is 60%, that is, when it is detected that the tape is traveling in the forward direction, the microcomputer 10 adds "1" to the value of the register for the control pulse addition count built in itself ( Step 52) Check whether the value of the register is a certain number (for example, "30") and wait until the value of the register reaches 30. (Step 53)

When the quantity of the control pulse string reaches "30" in step 53, the microcomputer 10 supplies a count pulse with an addition count command to the counter 14 that counts the amount of progress of the tape. (1) is added to the current tape progression count (step 54).

In step 51, when the duty ratio of the control pulse is not 60%, that is, when the tape is detected to run in the reverse direction, the microcomputer 10 subtracts "1" the value of the control pulse count register embedded therein ( Step 55) Wait until "30" is reached while checking the value of the register. In step 56, when the quantity of control pulses reaches "30", that is, when the value of the control pulse counting register is "30", the microcomputer 10 counts the progress of the tape. A counter pulse is supplied to the counter 14 with a subtraction count command to cause the counter 14 to subtract " 1 " from the current tape progression amount (step 57).

And the value of the control pulse count register built in the microcomputer 10 is repeated from "1" to "30".

As described above, the present invention has the advantage of accurately counting the progress of the tape by determining the progress amount of the tape by the duty ratio of the control pulse which depends on the actual progress direction of the recording medium. There is an advantage that can accurately find the desired information by the progress of the counted tape when searching the recorded information.

Claims (2)

A recording and reproducing apparatus, comprising: a microcomputer 10 for controlling a system, a head 11 for recording control pulses on a recording medium or reading a control pulse train recorded on the recording medium, and the control of the microcomputer 10; A servo control unit 12 for supplying a control pulse train to the head 11 during recording and controlling the running of the recording medium by a control pulse drawn from the head 11 during reproduction, and the servo control unit 12; And a control pulse train connected between the head 11 and the microcomputer 10 to transfer the control pulse train drawn from the servo control unit 12 to the head 11 during recording, and in other cases, the control pulse train drawn from the head. Waveform shaping unit 13 for transmitting the waveform to the servo control unit 12 and the microcomputer 10, and a counter 14 for counting the traveling amount of the recording medium under the control of the microcomputer 10. Records characterized by Progress of the display device body. A recording medium progress state display method of a recording / playback apparatus, comprising: a forward direction detecting step of detecting a forward direction of a recording medium by a duty ratio of a control pulse; and when the recording medium is detected to be traveling forward in the forward direction detecting step An addition counting process that adds an amount of progress of the recording medium when the number of incoming control pulses is a predetermined number; and when the number of control pulses is a certain number when the recording medium is detected to be traveling backward in the process of determining the direction of travel. And a subtraction count process of subtracting the amount of progress of the medium.

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