JPH08235839A - Counter display device - Google Patents

Abstract

PURPOSE: To display the time which matches with the speed of a recording and to improve the operability by counting or converting control signals corresponding to the mode of the recording. CONSTITUTION: When a VTR is activated, an operator decides whether to conduct a counter display, which is corresponding to the recording mode of a recording or not as a counter display mode during a reproducing by a key input 3. If the current VTR is discriminated to be in a recording mode, recording control signals are counted. If it is not in a recording mode, the presence and the absence of the display mode setting is discriminated. As a result, if a display mode setting has not been done, it is converted to display data using a control signal 30 pulse as one second and a setting is conducted in the memory display data region of a microcomputer. If the display mode is activated, a recording mode mode value RECMODE is read and the mode value of the current reproducing mode is read. Then, the display data are outputted to a display section 4. Thus, a counter display having a high operability is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter display device for displaying a tape running amount or a remaining amount of a video tape recorder having a long time recording / reproducing mode.

[0002]

2. Description of the Related Art There is a time-lapse VTR in which recording / reproduction is performed for a long time by intermittently repeating running / stopping of a magnetic tape or slow running of a magnetic tape and writing a recording signal during a running period.

This time-lapse VTR changes the recording speed by controlling the tape running speed or the stop time at the time of intermittent, and from 2 hours to 960 hours on the T-120 tape (VHS system 2-hour recording tape). It has a recording mode for recording at multiple tape speeds, and the mode can be set with a switch.

However, no matter which mode is used for recording, the control signal recorded on the control track of the tape is output at a constant interval with respect to the reproduction signal.

That is, even if recorded in the 2-hour mode, 9
Even if the control signal is recorded in the 60-hour mode, the control signal is output at a constant cycle when reproduced in the recorded mode.

Then, the output control signal is counted by a tape counter and displayed as a running amount.

In this counting operation, the rising edge of the control signal pulse is counted once every two fields of recording at the time of recording, 30 counts for 1 second in the NTSC system and 25 counts for 1 second in the PAL system. The time value (hours, minutes, seconds) is counted, and the counted value is displayed on-screen on a CRT display or a fluorescent display tube.

Therefore, the tape counter display is always 2
The display is in the time mode, and the display differs from the actual recording time.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a counter of a time-lapse VTR having a recording mode for recording a plurality of long-time recordings is displayed on a tape traveling amount corresponding to each recording mode. Alternatively, the technical problem is to display the remaining tape amount.

[0010]

In order to solve the above-mentioned problems, the present invention has the following features. 1. A counter display device that has a tape speed mode for recording / reproducing on / from a magnetic tape at a plurality of tape speeds and displays the tape running amount by counting the control signals recorded on the magnetic tape at the time of reproduction, and counts the control signals. Counting means, recording mode setting means for setting a tape speed mode at the time of recording, arithmetic control means for generating a display signal based on the control signal, and a display section for displaying by the display signal, The output value of the counting means and the mode value set by the recording mode setting means are input to the arithmetic control means, and the output value of the counting means and the mode value are calculated and output to the display section. 2. The calculation multiplies the output value of the counting means and the mode value. 3. A mode that is attached to a capstan motor that performs tape feeding and that generates a signal of a frequency corresponding to the rotation speed, and a mode that determines the speed mode value by the ratio of the frequency of the regenerated control signal and the output signal of the frequency generator. And a mode value determined by the mode determining means is set in the recording mode setting means. 4. A frequency generator attached to a capstan motor that feeds tape to generate a frequency signal corresponding to the rotation speed, and a mode that detects the speed mode value by the ratio of the frequency of the regenerated control signal to the output signal of the frequency generator. A detection means, and sets the mode value detected by the mode detection means to the recording mode setting means, and reproduces at the set value.

[0011]

According to the counter display device of the present invention, by counting the control signals corresponding to the recording mode, the time corresponding to the recording speed can be displayed.

[0012]

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

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus of the present invention.

In the figure, (1) is a servo section, which controls the drive of the capstan motor and the drum motor according to the recording mode and also switches the channel of the rotary magnetic head and generates a control signal.

Reference numeral (2) is a system control microcomputer, which gives an operation control instruction such as FF / REW to the servo section (1) by a command sent from the key input section (3) or a sensor signal input of each section.

(4) is a display unit such as an on-screen display or a fluorescent display tube, which displays the display data output from the system control microcomputer (2).

Further, the servo section (1) has the structure shown in FIG.

In FIG. 2, (5) is a magnetic tape (6).
It is a capstan motor that drives the vehicle, and is equipped with a frequency generator (7) (hereinafter referred to as FG).

The FG (7) generates two pulses having a phase delay of 90 degrees at a frequency proportional to the rotation speed of the capstan motor (5).

Reference numeral (8) is a magnetic head for recording / reproducing a video signal on the magnetic tape (6).

Reference numeral (9) is a head drum motor, which rotationally drives the cylinder drum to which the magnetic head (8) is attached.

A control head (10) records a control signal on a control track on the magnetic tape (6) and detects a signal on the control track during reproduction.

(11) is a start pulse generation circuit which generates a capstan start pulse having a predetermined width in synchronization with the head switching pulse in the intermittent recording mode.

A braking pulse generation circuit (12) counts the FG pulse output from the FG (7) in order to stop the tape at a predetermined position after the capstan motor is activated in the intermittent recording mode. Then, a capstan braking pulse is generated.

(13) is a capstan motor rotation control circuit, which rotates the capstan motor at a predetermined speed and phase.

(14) is a head drum motor rotation control circuit, which controls the rotation of the head drum motor.

A recording / reproducing control circuit (15) controls the magnetic head (8) to a recording state or a reading state.

Reference numeral (16) is an OR gate, which outputs the output of the starting pulse generating circuit (11), the braking pulse generating circuit (12) and the capstan motor rotation control circuit (14) to the capstan motor (5) during intermittent driving. introduce.

A switch (17) switches the output of the OR gate (16) at the time of intermittent driving and the capstan motor rotation control signal at the time of continuous driving to the capstan motor.

Reference numeral (18) is an FG counter, which resets at the rising edge of the recording control signal during intermittent driving and counts the pulses of the FG (7) attached to the capstan motor (5). Then, this count value is sent to the recording control signal generating circuit (19).

As a result, the control head (10)
The polarity of the magnetic field applied to is switched and the control signal is recorded on the magnetic tape (6).

Then, the system control microcomputer (6) operates according to the flow charts shown in FIGS.

3 to 5 show the first to third aspects of the present invention.
This relates to the third embodiment.

FIG. 3 is a flow chart showing the first embodiment of the present invention.

In the first embodiment, the time value at the time of recording is converted to the reproduction mode by setting the speed mode at the time of recording by the operator by the key input to the memory. Switching of the display mode for displaying the converted value or displaying the value in a predetermined mode (two-hour mode) is also performed by key input.

The process will be described below with reference to the flowchart of FIG.

When the VTR is activated, in step 1 of the main routine, the operator displays a recording mode, which is a mode value at the time of recording, as a counter display mode at the time of reproduction, and a counter display corresponding to the recording mode at the time of reproduction. Enter the setting of whether or not with the key. Value entered (RECMODE)
The display mode (ON / OFF) is set in the memory in step 2.

Thereafter, the control shifts to the subroutine 1.

In step 3 of the subroutine SUB1,
It is determined whether or not the control signal exists, and if it is determined that the control signal does not exist, the process proceeds to step 5.

If the control signal is present in step 3, the control signal is counted in step 4 in accordance with the tape running direction, and then the process proceeds to step 5.

In step 5, it is judged whether the current VTR is in the recording mode or the reproducing mode.

When it is determined in step 5 that the recording mode is set, the recording control signal is counted in step 6.

If it is determined in step 3 that the recording mode is not set, it is further determined in step 7 whether or not the display mode is set.

Here, if the display mode is not set, the count value of the control signal is converted into display data in which 30 pulses of the control signal are 1 second and set in the display data area of the memory of the microcomputer.

When it is determined in step 7 that the display mode is ON, that is, there is a switching input, data conversion is performed in the following procedure in the subroutine SUB2.

In step 10, the count value of the control signal is read, and in step 11, the mode value (RECMODE) of the recording mode set in step 2 is read.

Further, in step 12, the mode value (PBMODE) of the current reproduction mode is read.

Then, in step 13, the following calculation is performed.

T = number of control counts × RECMODE / 60 R = RECMODE-T Here, the running amount T (unit: second) and the remaining tape amount R in the recording mode.

In step 14, this value is set in the display data area of the memory.

After that, the process returns to the subroutine 1 and step 9
To output the display data to the display section.

FIG. 4 is a flow chart showing the second embodiment of the present invention.

The second embodiment is an example in which the reproduction mode is set in accordance with the recording mode, and the recording mode is automatically set by setting the reproducing mode to the recording mode automatically. Of the recording mode is obtained from the relationship between the reproduction control signal and the capstan FG and is set in the memory to perform conversion in the reproduction mode.

This method of discriminating the tape speed mode is disclosed in Japanese Patent Application Laid-Open No. 52-113705, and is a well-known technique, so a detailed description thereof will be omitted.

The process will be described below with reference to the flowchart of FIG.

When the VTR is activated, the control signal is input in step 1 of the main routine and the capstan FG signal is input in step 2.

In step 3, the frequency ratio of the two signals is obtained from the number of capstan FG pulses in one cycle of the control signal.

Then, in step 4, the recording mode value (REC
MODE) is discriminated, and this value is set in the memory in step 5.

Here, RECMODE is a 24-hour mode (T-
The mode value is 24 in the case of recording on 120 tapes for 24 hours) and the mode value is 960 in the case of 960 hours mode.

Further, in step 6, VTR playback mode
The recording mode value (R
Set to ECMODE).

Thereafter, the control shifts to the subroutine 1.

In step 7 of the subroutine SUB1,
It is determined whether or not the control signal exists, and if it is determined that the control signal does not exist, the process proceeds to step 9.

If the control signal is present in step 7, the control signal is counted in step 8 according to the tape traveling direction, and then the process proceeds to step 9.

At step 9, it is judged whether the current VTR is in the recording mode or the reproducing mode.

When it is determined in step 9 that the recording mode is set, the recording control signal is counted in step 10.

When it is determined in step 9 that the recording mode is not set, the data conversion is performed in the following procedure in the subroutine SUB2.

In step 12, the count value of the control signal is read, in step 13, the mode value (RECMODE) of the recording mode set in step 5 is read, and in step 14, the next calculation is performed.

T = control count number × RECMODE / 60 R = RECMODE-T Here, the running amount T (unit: second) and the remaining tape amount R in the recording mode.

In step 15, this value is set in the display data area of the memory.

After that, the process returns to the subroutine 1 and step 1
At 1, the display data is output to the display unit.

As a result, it is possible to always reproduce in the tape speed mode at the time of recording, and to display the time and the remaining tape amount at the time of recording.

FIG. 5 is a flow chart showing the third embodiment of the present invention.

The third embodiment is an embodiment in which the recording mode and the reproduction mode are different.

The process will be described below with reference to the flowchart of FIG.

When the VTR is activated, in step 1 of the main routine, the operator keys in the reproduction mode. This input value (PBMODE) is set in the memory in step 2.

Then, in step 3, the control signal is input, and in step 4, the capstan FG signal is input.

In step 5, the frequency ratio of the two signals is obtained from the number of capstan FG pulses in one cycle of the control signal.

Further, in step 6, the recording mode value (REC
MODE) is discriminated, and this value is set in the memory in step 7.

Then, the control shifts to the subroutine 1.

In step 8 of the subroutine SUB1,
It is determined whether or not the control signal exists, and if it is determined that the control signal does not exist, step 10
Move on to.

If the control signal is present in step 8, the control signal is counted in step 9 in accordance with the tape running direction, and then the process proceeds to step 10.

At step 10, it is judged whether the current VTR is in the recording mode or the reproducing mode.

When it is determined in step 10 that the recording mode is set, the recording control signal is counted in step 11.

When it is determined in step 10 that the recording mode is not set, data conversion is performed in the following procedure in the sub routine SUB2.

In step 13, the count value of the control signal is read, and in step 14, the mode value (RECMODE) of the recording mode set in step 6 is read.

In step 15, the reproduction mode value (PBMODE) set in step 2 is read.

In step 16, the following calculation is performed.

T = number of control counts × PBMODE / 60 R = RECMODE-T Here, the running amount T (unit: second) and the remaining tape amount R in the recording mode.

In step 17, this value is set in the display data area of the memory.

After that, the procedure returns to the subroutine 1 and the step 1
In step 2, the display data is output to the display section.

As a result, when the tape speed mode at the time of recording and the tape speed mode at the time of reproducing are different, the time display at the time of recording or the tape remaining amount display is performed.

In this embodiment, the microcomputer is used for the calculation, but the calculation control means may be realized by hardware such as a counter, a multiplier, an adder and a subtracter.

[0093]

As described above, according to the present invention, by counting or converting the control signal corresponding to the recording mode, it is possible to display the time corresponding to the recording speed, and to record. Even when the recording mode at the time of recording and the recording mode at the time of playback are different, the recording time at the time of recording can be displayed, so you can enter the counter display of the same time as the recorded time setting and the elapsed time according to the playback screen Understandability and usability for the operator are improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a counter display device of the present invention.

FIG. 2 is a block diagram of a servo unit of the magnetic recording / reproducing apparatus.

FIG. 3 is a flowchart according to the first embodiment.

FIG. 4 is a flowchart according to a second embodiment.

FIG. 5 is a flowchart according to a third embodiment.

[Explanation of symbols]

 1 Servo part 2 System control microcomputer 3 Key input part 4 Display part 5 Capstan motor 6 Magnetic tape 7 Frequency generator 8 Magnetic head 9 Head drum motor 10 Control head 11 Start pulse generation circuit 12 Braking pulse generation circuit 13 Capstan motor rotation Control circuit 14 Head drum motor rotation control circuit 15 Recording / reproduction control circuit 16 OR gate 17 Switch 18 FG counter 19 Recording control pulse creation circuit

Claims (4)

[Claims] 1. Recording / recording on a magnetic tape at a plurality of tape speeds
In a counter display device which has a tape speed mode for reproducing and counts a control signal recorded on the magnetic tape at the time of reproduction to display the tape running amount, a counting means for counting the control signal, and a tape speed at the time of recording. It has a recording mode setting means for setting a mode, an arithmetic control means for generating a display signal based on the control signal, and a display section for displaying by the display signal, and the output value of the counting means and the recording A counter display device, wherein the mode value set by the mode setting means is input to the arithmetic control means, the output value of the counting means and the mode value are arithmetically operated, and output to the display section. 2. The counter display device according to claim 1, wherein the arithmetic operation multiplies an output value of the counting means by the mode value. 3. A speed mode based on a frequency generator attached to a capstan motor for feeding a tape to generate a signal having a frequency corresponding to a rotation speed, and a frequency ratio between a reproduced control signal and an output signal of the frequency generator. A mode discriminating means for discriminating a value, and the mode value detected by the mode detecting means is set in the recording mode setting means.
Alternatively, the counter display device according to claim 2. 4. A speed mode based on a frequency generator mounted on a capstan motor for feeding a tape to generate a signal of a frequency corresponding to a rotation speed, and a frequency ratio of a reproduced control signal and an output signal of the frequency generator. 2. A mode detecting unit for detecting a value, which sets the mode value discriminated by the mode discriminating unit in the recording mode setting unit and reproduces at the set value. Item 2. A counter display device according to item 2.