JPH0445189Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tape running amount display device for a tape recorder or the like.

(Prior art) The tape amount time obtained by the calculation is compared with the currently displayed tape amount time, and if the error is within a certain time, a predetermined error is calculated for the currently displayed tape amount time. There is a tape amount time display method that displays the time by making corrections, and when the error exceeds a certain time, the calculated tape amount time is displayed.

(Problem that the invention aims to solve) In these conventional methods, even if the error exceeds a certain time and the display time temporarily jumps, it is difficult to determine whether it is normal operation due to time correction or abnormal operation due to a failure. There were various inconveniences, such as not being able to confirm whether the battery was running, or overlooking a sudden change in the remaining amount of time.

(Means for solving the problem) A first system that calculates the amount of travel from the end of the tape based on the rotation period of the reel when the tape runs at a predetermined speed, and outputs a travel information signal corresponding to this. a second calculating means for outputting a substantially constant number of trigger signals per unit length of the tape based on the rotation information of each reel; for,
Thereafter, an addition/subtraction means for outputting an addition/subtraction signal obtained by sequentially adding or subtracting a predetermined time coefficient depending on the running direction of the tape in synchronization with the trigger of the trigger signal, and displaying time information corresponding to the value of the addition/subtraction signal. A display means periodically compares the traveling information signal and the addition/subtraction signal, and outputs a correction signal if the time difference corresponding to the difference is within a predetermined time, and outputs an instantaneous change signal if it is outside the predetermined time. and a blinking display driving means that operates so that the display on the display means becomes a blinking display.

(Function) The addition/subtraction means outputs an addition/subtraction signal obtained by sequentially adding or subtracting a time coefficient corrected to reduce the time difference after the correction signal is output, and after the instantaneous change signal is output. The blinking display driving means outputs an addition/subtraction signal in which the uncorrected time coefficient is sequentially added or subtracted from the information value of the traveling information at that time, and furthermore, the blinking display driving means outputs an addition/subtraction signal for a predetermined period of time when the instantaneous change signal is output. Operate.

(Embodiment) The figure is a block diagram showing an embodiment of the present invention, where 1 and 2 indicate a supply reel and a take-up reel, and 14 indicates a magnetic tape. 3 and 4 are rotation detectors that generate pulse signals S ₁ and S ₂ corresponding to the rotation of the reels 1 and 2. The rotation detectors 3 and 4 are constructed, for example, by providing a required number of magnetic pieces on the rotating shafts 1 ₁ and 2 ₁ of each reel, and arranging a magnetically sensitive element opposite to the magnetic pieces.

5 detects the respective rotation periods T ₁ and T ₂ of the supply and take-up reels 1 and ₂ in response to the pulse signals S ₁ and S 2;
Absolute position time P of tape 14 (tape usage time)
Or, calculate P′ (tape remaining time) and output the time signal.
A first arithmetic circuit 6 outputs an output as S ₃ to the addition/subtraction circuit 9 and comparison/correction circuit 12, and 6 outputs an approximately constant number C per unit tape length movement in response to pulse signals S ₁ and S ₂ from the rotation detectors 3 and 4. The trigger signal S ₄ is added to the addition/subtraction circuit 9.
The second arithmetic circuits that output the output are shown respectively.

7 is calculated based on the selection information signal S ₁₁ given from the selection operation circuit 8 in response to the operation by the operator and the area information signal S ₅ of (T ₁ ² +T ₂ ² ) information from the calculation circuit 5. A third arithmetic circuit outputs the time coefficient K per trigger as an output signal S ₆ to an adder/subtractor circuit 9, which outputs a trigger signal S ₄ depending on the required operation mode.
For each trigger input, the time coefficient K is changed to the absolute position time P
or an addition/subtraction circuit that outputs display times D (tape usage time) and D' (tape remaining time) obtained by sequentially adding or subtracting P' to the display means 10 and the comparison/correction circuit 12 as a time signal _S8 ; Reference numeral 11 indicates switching command means for outputting an output signal _S7 corresponding to the tape running direction to the addition/subtraction circuit 9 and controlling switching between addition and subtraction.

12 compares the absolute position times P, P' and the display times D, D' at predetermined time intervals, and sends a correction signal _S9 based on the difference to the arithmetic circuit 7, and an instantaneous change signal _S10 to the addition/subtraction circuit 9 and Comparison and correction circuits respectively output to the blinking circuit 13, and display means 10 digitally displays the display time D or D' based on the time signal _S8 from the addition/subtraction circuit 9. Flashing circuit 13
is a circuit that acts on the display means 10 for a predetermined period of time in synchronization with the input of the instantaneous change signal _S10 from the comparison and correction circuit 12, and causes the time display to blink.

The calculation method and operation will be explained in more detail below.

The first arithmetic circuit 5 calculates rotational synchronization T ₁ and T ₂ of each reel when the tape 13 is running at a constant speed,
The tape absolute position time P or P' is calculated using the following equation and is output as a time signal _S3 to the addition/subtraction circuit 9 and the comparison/correction circuit 12.

P=1/aV{T ₂ ² /T ₁ ² +T ₂ ² (2Sh+La)−Sh} ……(1) P′=1/aV{T ₁ ² /T ₁ ² +T ₂ ² (2Sh+La)−Sh} ...(1') However, a is the tape thickness, V is the playing tape speed, Sh is the reel hub area, and L is the total length of the tape.On the other hand, rotation detectors 3 and 4 measure the rotation of both reels 1 and 2 per unit tape length movement. The arithmetic circuit 6 outputs pulse signals S ₁ and S ₂ of pulse numbers A and B corresponding to the number of pulses, and from these pulse signals, the arithmetic circuit 6 outputs a trigger signal S ₄ of a substantially constant number C according to the following arithmetic expression.

When A≧B, C=xA+xB When A<B, C=yA+xB...(2) Note that the coefficients x and y are positive numbers, and the number of triggers obtained per unit tape length movement is approximately a constant number C. It is selected as follows.

In addition, the time coefficient K per trigger signal is a linear function of the tape area S (total thickness of tape wound on each reel) K = αS + β ... (3) However, α and β are predetermined according to the tape type. It can be almost calculated using the given constants.
062294 (Refer to Utility Model Application No. 60-175386)), and the tape area S is calculated by the first calculation circuit 5.
Area information signal S ₅ of (T ₁ ² + T ₂ ² ) in equations (1) and (1′)
It can be calculated using the following formula.

S=T ₁ ² + T ₂ ² ) V ² /4π−2Sh ...(4) If there are no variations in the reel hub diameter Rh, tape thickness a, and tape total length L for the same type of tape (types based on nominal usage time), then The area S of each type of tape can be easily determined by a×L, and this can be calculated using
It is possible to set the time coefficient K by substituting it into equation (3), but in actual commercially available tapes, even if they are of the same type, there are considerable variations in these values due to differences in manufacturers and manufacturing lots. . Therefore, (4)
The time coefficient K is calculated by substituting the tape area S obtained by the formula into the formula (3).

The arithmetic circuit 7 calculates the tape area S calculated by equation (4) based on the information (T ₁ ² +T ₂ ² ) from the arithmetic circuit 5 as described above, and also responds to the tape type selection operation by the operator. From the constants α and β based on the output signal _S6 output from the selection operation circuit 8, the time coefficient K can be calculated using equation (3).
is calculated, and this time coefficient K is output to the addition/subtraction circuit 9 as an output signal _S6 .

The addition/subtraction circuit 9 receives the time signal _S3 of the tape absolute position time P or P' calculated by the calculation circuit 5, the trigger signal _S4 from the calculation circuit 6, and the output signal _S6 of the time coefficient K from the calculation circuit 7. Display time D or
Calculate D′.

For example, in the case of displaying the remaining amount, in tape constant speed running mode, the absolute position time P' is calculated once within a short time at the beginning of tape constant speed running, and then by the integration method, D'1 = P' + K D '2=D'1+K 〓 D'n=D'n-1+K 〓 As shown in the above formula, each time the trigger signal _S4 is input, the time coefficient K is added according to the tape running direction (in case of rewinding), The display time D' is calculated by subtraction (in the case of constant speed or fast forwarding). By outputting this time signal _S8 to the display means 10 and displaying it digitally, the time can be displayed not only in the tape constant speed running mode but also during fast forwarding. However, in this case, the number of trigger signals C obtained per unit tape length movement calculated by the above equation (2) is not completely constant, so the display time D' and the absolute position calculated by the first calculation circuit A discrepancy will occur between the time and the time P′. Therefore, the comparison and correction circuit 12 performs a correction operation for the display time D' (tape remaining amount time), and this operation will be further described.

When the tape runs at a constant speed, the comparison correction circuit 12
Then, the following calculation E=D'-P' (5) is performed every 10 seconds, and a correction signal _S9 of the correction amount p is output to the third calculation circuit 7 based on the following conditions.

When |E| = 0 [s] Correction amount = p ₁ When |E| = 1 [s] Correction amount = p ₂ When |E| = 2 [s] Correction amount = p ₃ |E|≦8 When [s], the correction amount = p ₄ Also, when E<0 [s], the correction amount p ₁ to p ₄ is a positive constant, and when E≧0 [s], the correction amount p is a negative constant. do.

The arithmetic circuit 7 outputs the signal (K+p) with the time coefficient K corrected as its output signal _S6 to the addition/subtraction circuit 9.
Output to.

The above correction amounts p ₁ to _{p 4} are set in advance. For example, when calculating the correction amount p ₂ , 2 [s] of correction is performed in 10 seconds, so the tape movement during constant speed running for 10 seconds is When the amount is 1, the number of trigger signals is approximately C·1, and p ₂ can be determined and set in advance using the following equation: p ₂ =2 [s]/C·1 (6). Similarly, other correction amounts p ₁ and p ₃ are also set in advance.

However, in the case of p ₄ , the numerator of equation (6) is calculated as 3 [s]. This is because if the correction amount is too large, the variation in the time interval of the display time will increase in proportion to it, making it visually unnatural.

Furthermore, if |E|>8 [s], the instantaneous change signal _S10 is output to the addition/subtraction circuit 9 and the display means 10. The adding/subtracting circuit 9 receives this signal, takes in the absolute position time P', and at the same time outputs it as the display time D', and after instantaneously changing the display time, changes the time coefficient K to the display time D' again. Repeat addition and subtraction.

On the other hand, when the blinking circuit 13 receives the instantaneous change signal _S10 , it acts on the display means 10 for several seconds of a predetermined time, causing the time display to blink.

A series of operations based on these instantaneous change signals _S10 are as follows:
When the tape is repeatedly moved in fast forward mode, which is a mode that does not perform correction operation, or in rewind mode, the difference E between the current display time D' and the absolute position time P' increases, and |E| becomes 8 [s]. In such a case, instead of gradually correcting the current display time D', the current display time D' is instantaneously changed to the absolute position time P'. Furthermore, when this operation is performed, the display time D' will jump for at least 8 seconds or more, but at this time, the time display is made to blink for a few seconds so that the operator can confirm it. .

(Effect of the invention) According to the invention, even if a time jump occurs in the display time due to time correction, the operator is notified by flashing the display, so the operator can avoid confusion due to malfunction. .

[Brief explanation of the drawing]

The figure shows a block diagram of an embodiment of the present invention. 1... Supply reel, 2... Take-up reel, 3, 4
...Rotation detector, 5...First arithmetic circuit, 6...
Second arithmetic circuit, 7...Third arithmetic circuit, 8...
Selection operation circuit, 9...addition/subtraction circuit, 10...display means, 11...switch command means, 12...comparison and correction circuit, 13...blinking circuit, 14...magnetic tape.

Claims (1)

[Claims for Utility Model Registration] A tape running amount display device in which a continuous tape is wound around a supply reel and a take-up reel, and displays the running amount of the tape running between each reel, wherein the tape is wound on a supply reel and a take-up reel. a first calculation means that calculates a running distance from an end of the tape based on a rotation period of the reel when running at a predetermined running speed, and outputs a running information signal corresponding to the running distance; and rotation information of each of the reels. a second calculation means that outputs a substantially constant number of trigger signals per unit length of the tape based on the running information signal; an addition/subtraction means for outputting an addition/subtraction signal obtained by sequentially adding or subtracting a predetermined time coefficient depending on the running direction of the tape; a display means for displaying time information corresponding to the value of the addition/subtraction signal; Comparing and correcting means that compares the travel information signal and the addition/subtraction signal, and outputs a correction signal if the time difference corresponding to the difference is within a predetermined time, and outputs an instantaneous change signal if it is outside the predetermined time; and a blinking display driving means that operates so that the display of the means becomes a blinking display, and the addition/subtraction means sequentially adds or subtracts the time coefficient corrected to reduce the time difference after the correction signal is output. outputting an addition/subtraction signal obtained by sequentially adding or subtracting the time coefficient that is not corrected to the information value of the traveling information at that time after the instantaneous change signal is output; A tape running amount display device, characterized in that the driving means operates for a predetermined period of time when the instantaneous change signal is output.