JPH0955074A - Tape running display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a real time display possible according to tape running by easy constitution and processing. SOLUTION: A conversion coefficient A is calculated using pulse period information TS0 from a period detection part 12, and the operation using the calculated conversion coefficient A is performed for a count value C from a pulse counter 11, and linear time information tn as a time value corresponding to a tape running amount is generated. Further, the conversion coefficient is calculated again at the required point of time, and the conversion coefficient A used in a linear time conversion part 14 is updated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a tape recorder,
The present invention relates to a tape running display device suitable for displaying the tape running amount in a device that runs a tape between a plurality of reels such as a tape player.

[0002]

2. Description of the Related Art Digital tape recorders called DAT, analog tape recorders using compact cassette tapes, etc. are in widespread use. However, in devices using these tape cassettes as recording media, a count display accompanying tape running is displayed. Has been done.

This count display is performed using a signal synchronized with the rotation of one reel, for example, but this does not correspond to the real time of tape running. That is, since the winding diameter of the tape on the reel changes as the tape runs, the tape running length while the displayed count value changes by one step greatly differs near the tape top and near the tape end. In other words, the conventional count display relating to tape running does not correspond to the real time of tape running, that is, the real time of recorded / reproduced music and the like, and thus cannot be said to be appropriate as a guide display for the user.

[0004]

Therefore, for example, both the supply-side reel and the take-up-side reel are equipped with generators of signals synchronized with the rotation, and the signals from both generators are used to carry out tape running. In some cases, the time was calculated and the actual time was displayed when the tape was running.

However, in this case, for example, a pulse generator is required for both reels, two pulse counters are required, and complicated arithmetic processing using the outputs of the two pulse counters is required. There are circumstances,
There is a problem that the processing and the apparatus configuration are complicated and the cost is increased accordingly, and it is difficult to reduce the size of the entire tape recorder device.

[0006]

In view of the above problems, the present invention has the following advantages when a tape is run between a plurality of reels.
It is an object of the present invention to provide a tape traveling display device for displaying a value relating to tape traveling, which enables real-time display according to tape traveling by a simple configuration and processing.

Therefore, pulse generating means for generating a pulse synchronized with the rotation of one reel, pulse counter means for generating a count value according to the rotation of the reel based on the pulse from the pulse generating means, and pulse generation. Means for detecting the cycle of the pulse from the means. Further, the conversion coefficient calculating means for calculating the conversion coefficient using the cycle information from the cycle detecting means and the conversion coefficient calculated by the conversion coefficient calculating means for the count value from the pulse counter means are calculated. And linear time information output means for generating linear time information having a time value corresponding to the running amount. Then, the display operation is performed by the display means using the linear time information from the linear time information output means.

With this configuration, it is possible to obtain real-time information and display it only by obtaining rotation information about one reel. Then, the real-time information can be calculated only by performing a simple coefficient calculation on the count value synchronized with the reel rotation.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. In this example, a tape running display device built in, for example, a digital tape recorder will be described.

FIG. 1 is a block diagram of a main part as a tape running display device in a digital tape recorder.
Incidentally, the tape running mechanism and circuit of the tape running display device,
The recording / reproducing mechanism and the circuit are not directly related to the present invention, and the description thereof is omitted.

The magnetic tape 1 is wound around a supply reel 2 and a take-up reel 3 in a tape cassette housing (not shown), and in this figure, a state of traveling from the supply reel 2 side to the take-up reel 3 side is shown. ing. A guide member 5 is arranged in a tape traveling system from the supply reel 2 to the take-up reel 3 to form a traveling path, and a rotary head drum 4 on which a recording / reproducing magnetic head is arranged is a tape cassette. The magnetic tape 1 is pressed into contact with the inside. Then, as the rotary head drum 4 rotates as the magnetic tape 1 runs, the magnetic head scans the magnetic tape 1 in the recording track direction, for example, recording / reproducing of data to / from the magnetic tape 1 by a helical scan method. Is executed.

Here, as the structure of the tape running display device, first, a pulse generator 10 for generating a pulse in synchronization with the rotation of the supply reel 2 is provided. The pulse generator 10 is configured to generate, for example, 12 pulses per one rotation of the supply reel 2 as shown in FIG. The pulse from the pulse generator 10 is supplied to the pulse counter 11 and the period detector 12.

The pulse counter 11 counts the pulses from the pulse generator 10 and outputs a count value C. That is, when the magnetic tape 1 is running, the count value corresponding to the rotation of the supply reel 2 is output. The length of the magnetic tape 1 fed out by one rotation of the supply reel 2 changes as the magnetic tape 1 runs. That is, the winding diameter of the magnetic tape 1 wound around the supply reel 2 becomes smaller as the tape travels. However, since the count value C from the pulse counter 11 always counts the pulses corresponding to the reel rotation, the count value C does not correspond to the real time of running the magnetic tape.

The period detector 12 is a pulse generator 10.
Detects the period of the pulse from and outputs the period information T _S0 . In this case, the cycle is 12 pulses as shown in FIG. 3, that is, a period of one rotation of the supply reel 2.

Count value C from the pulse counter 11
Is supplied to the linear time conversion unit 14, the SW1 terminal of the switch 13, and the controller 18. Switch 13
The count value C is input to the coefficient setting unit 15 by turning on the SW1 terminal of the. The cycle information T _S0 from the cycle detector 12 is supplied to the SW2 terminal of the switch 13. When the SW2 terminal of the switch 13 is turned on, the cycle information T _S0 is input to the coefficient setting unit 15.

The controller 18 is formed of, for example, a microcomputer and serves as a part for controlling the entire apparatus.
With respect to the portion as the tape running display device, the controller 18 controls ON / OFF of the switch 13 and processing execution control in the coefficient setting section 15.

The controller 18 turns on the terminals SW1 and SW2 of the switch 13 at a predetermined timing. Then, the count value C and the cycle information T _S0 are input to the coefficient setting unit 15. The coefficient setting unit 15 uses the cycle information T _S0 to calculate the coefficient A by a necessary calculation process described later. Then, the coefficient A is supplied to the linear time conversion unit 14. Further, the value C ₀ is set by the count value C input at the same time as the cycle information T _S0 used for calculating the coefficient A, and is supplied to the linear time conversion unit 14. The value C ₀ will be described later.

The linear time conversion unit 14 performs a predetermined arithmetic process on the input count value C using the coefficient A and the value C ₀ , and outputs a linear time count value tn. The linear time count value tn is a value as real time corresponding to the actual tape running amount. That is, the coefficient A is a coefficient for simply converting the count value C, which is a value corresponding to the rotation of the supply reel 2, into a value as real time corresponding to the actual tape running amount.

The linear time count value tn from the linear time converter 14 is supplied to the display driver 16.
The display driver 16 performs the operation of displaying the value input as the linear time count value tn on the display unit 17. That is, the display unit 17 performs a count display (tape running time display) that expresses the tape running amount as a real time when the tape is running.

As such a tape running display device, FIG. 2 shows the processing of the controller 18 for displaying the tape running time. When the running of the magnetic tape 1 is started,
The controller 18 has terminals SW1 and SW2 of the switch 13.
Is turned on, and the count value C and the cycle information T _S0 are supplied to the coefficient setting unit 15 (F101, F102). Subsequently, the coefficient setting unit 15 is caused to calculate the coefficient A using the count value C and the cycle information T _S0 input in that state (F103).

When the coefficient A is calculated, the terminals SW1 and SW2 of the switch 13 are turned off (F104), and the coefficient A is calculated.
Is supplied to the linear time conversion unit 14 to set the value of the coefficient A (F105). As a result, the linear time conversion unit 1
4, the predetermined arithmetic processing using the coefficient A can be executed on the input count value C, that is, the linear time count obtained by converting the count value C into a value as real time corresponding to tape running. The value tn can be calculated.

The controller 18 monitors the count value (C _n -C ₀ ) in step F106,
When the value of the count value (C _n −C ₀ ) exceeds a certain upper limit value, the processing after step F102 is executed again, and the coefficient A
I am trying to reconfigure. This operation will be described later.

The calculation process for converting the count value C into the linear time count value tn and the calculation process for setting the coefficient A will be described below.

As the count value C of the pulse counter 11, a value at a certain time point (for example, the time point when the calculation of the coefficient A is started) is set to C _0, and the count value C at the time point when the tape running is advanced to some extent from that time point. _{Let the} value be C _n . Count value C
During the period from C ₀ to C _n , the magnetic tape 1
_Let L _{n be} the length of movement by L _n , this movement length L _n is expressed by the following (Equation 1).

[Equation 1] Here, n _S0 is the tape winding number of the supply reel 2 when the count value C = C ₀ , h is the reel hub diameter of the supply reel 2 (see FIG. 1), and d is the tape thickness of the magnetic tape 1. Also,
“12” is because the pulse output from the pulse generator 10 is 12 waves per reel rotation.

Here, the coefficient of the first-order term in (Equation 1) is A, and the coefficient of the second-order term is B. That is,

[Equation 2]

(Equation 3) Then, the above (Equation 1) becomes

(Equation 4) It can be.

From (Equation 2), the coefficient A is n _S0 , d, h,
In other words, it is a value determined by the number of tape windings of the supply reel 2 when the count value C = C ₀ , the reel hub diameter of the supply reel 2, and the tape thickness of the magnetic tape 1. Further, from (Equation 3), the coefficient B is the tape thickness d. It is a value determined by.

Here, if the tape movement length L _n is divided by the tape length corresponding to the recording time of 1 second, the linear time count value t in the period in which the count value C advances from C ₀ to C _n
n can be obtained. The tape length corresponding to the recording time of 1 second is equal to the tape speed during recording. The linear time count value tn is

(Equation 5) Is calculated as V is a tape length corresponding to a recording time of 1 second.

That is, in the linear time converter 14, the input count value C is calculated by the equation (5) using the coefficients A and B, the value C ₀ , and the tape length V corresponding to the recording time of 1 second. (= C _n ) to linear time count value t
n can be calculated. The value C ₀ is the count value C when the coefficient A is calculated.

Here, assuming that the tape thickness d is constant, the coefficient B can be a fixed value. Further, the tape length V corresponding to the recording time of 1 second is also a fixed value. Therefore, the linear time conversion unit 14 may hold the value of the tape length V corresponding to the coefficient B and 1 second as fixed data.

However, the coefficient A cannot be a fixed value because there is a term of the number of tape windings n _S0 of the supply reel 2 when the count value C = C ₀ . Therefore,
The coefficient A is calculated by the coefficient setting unit 15 at a predetermined time point, and the coefficient A is supplied to the linear time conversion unit 14 so that it can be used in the arithmetic processing of (Equation 5).

The coefficient A is obtained by the equation shown in (Equation 2), but the number of tape windings n _S0 of the supply reel 2 is not a value that can be directly measured. Therefore, in the tape traveling display device of FIG. 1, the coefficient A can be calculated using the pulse period information T _S0 obtained by the period detection unit 12.
This is because the pulse period information T _S0 has a value proportional to the tape winding diameter, that is, a value proportional to the tape winding number n _S0 .

The relationship between the cycle information T _S0 and the number of tape windings n _S0 is

(Equation 6) Is represented as Substituting this relationship into the above (Equation 2), the coefficient A becomes

(Equation 7) Can be obtained as In the coefficient calculation unit, the coefficient A is calculated by the calculation of (Equation 7) at the time of the count value C = C ₀ , and the value of the value C ₀ is set, and the linear time conversion unit 14
To supply.

The linear time conversion unit 14 uses the input coefficient A and value C ₀ and the fixed coefficient B and value V, and the count value C input from the pulse counter 11 at each time point as the value C _n . By doing so, the linear time count value tn can be calculated by the calculation of (Equation 5).

As described above, in the tape running display device according to the present embodiment, the pulse generator 10 synchronized with the rotation of one reel and the pulse counter 11 are used, and the coefficient is calculated by using the pulse cycle information T _S0 at a predetermined time point. By setting A, it is possible to obtain the value as the tape running real time from the pulse count value C only by performing a simple coefficient calculation. Although the pulse generator 10 is provided for the supply reel 2 in FIG.
It may be provided for. In this case, needless to say, the arithmetic processing needs to be changed.

By the way, in the above calculation method of the linear time count value tn, since the linear time count value tn until the count value C changes from C ₀ to C _n is calculated for each calculation, the count value C _{As n} increases, larger numbers need to be multiplied and divided. In other words, the calculation processing load increases.

Therefore, when it is required to reduce the calculation load, it is conceivable that each calculation is performed only with the difference from the previous processing, and the calculated value is not increased.
A calculation formula is shown below when the count value C changes from C _n-1 to C _n . First, the tape movement length L _n, the tape movement length L _n-1 in the previous calculation,

(Equation 8) From

[Equation 9] Becomes Note that ΔC _n is C _n −C _n−1 .

Here,

(Equation 10) Becomes t _n-1 is the linear time count value as the previous calculation result. By using "L _n-1 '" in (Equation 10), that is, the remainder in the previous division, (Equation 5) described above can be changed to (Equation 11) below.

[Equation 11] That is, it is possible to perform the calculation each time by using the difference from the previous processing as ΔC _n , and it is possible to prevent the calculated value from becoming considerably large as the tape runs.

By the way, as shown as step F106 in FIG. 2, the controller 18 monitors the value of C _n -C ₀ , and when this value exceeds a certain upper limit value, that is, the reel rotation is the count value. At a time point after a predetermined number of rotations has been performed from the state of C = C ₀ , the process is returned to step F102, and the coefficient A is reset. This operation will be described.

As described in (Equation 3) above, the coefficient B is a fixed value determined by the tape thickness d. Therefore, if the actual tape thickness deviates from the value when the coefficient B is determined, an error will occur in the linear time count value tn. The maximum error of the tape thickness is as small as about 0.4 μm, but as can be understood from (Equation 5), this error has a square effect when calculating the linear time count value tn, and cannot be ignored. Will be things. For example, an error of about 120 seconds may occur from the tape top to the tape end of a 120-minute tape.

In order to suppress such an error, step
F106 monitors the value of C _n -C _0, if the value of C _n -C ₀ exceeds a certain set upper limit value, C _n -C ₀ =
It is updated so that it becomes zero. That is, the count value C at that time is taken in as C ₀ , and the coefficient A is newly calculated.

As a result, the relationship between the pulse count value C and the linear time count value tn becomes as shown in FIG. 4, for example, and the error in the displayed running time is suppressed. In FIG. 4, when the value of C ₀ is first set, the processing is performed with the coefficient A = A1.
It is assumed that when the counter value C = C _n1 , the value of C _n −C ₀ exceeds the upper limit value. Then, the count value C at this time
Is newly set as C _0, and a new value of the coefficient A at that time is calculated to set the coefficient A = A2. Further, when the value of C _n −C ₀ exceeds the upper limit value when the counter value C = C _n2 , the count value C at this time is newly set to C _0, and a new coefficient A at that time is obtained. The value of is calculated and the coefficient A = A3 is set.

In FIG. 4, different coefficients A are used in the three areas as the tape runs, but in practice, for example, a 120-minute magnetic tape is divided into four parts, and a 90-minute magnetic tape is divided into three parts. It is conceivable that the 60-minute magnetic tape is divided into two parts.

[0043]

As described above, the tape running display device of the present invention calculates the conversion coefficient using the pulse cycle information from the cycle detection means, and the conversion coefficient calculation means with respect to the count value from the pulse counter means. Since the calculation is performed using the conversion coefficient calculated in, and the linear time information that is a time value corresponding to the tape running amount is generated,
It is possible to display linear time information corresponding to tape running with a simple configuration and easy arithmetic processing. Further, since the linear time information is obtained by using the pulse corresponding to the reel rotation which is in the exact proportional relationship with the tape running position, there is an advantage that the relationship between the tape running position and the linear time information is not easily deviated.

Further, the accuracy of the linear time information can be improved by re-calculating the conversion coefficient at a required time and updating the conversion coefficient used in the linear time information output means.

[Brief description of drawings]

FIG. 1 is a block diagram of a tape traveling display device according to an embodiment of the present invention.

FIG. 2 is a flowchart of an operation process of the tape traveling display device according to the embodiment.

FIG. 3 is an explanatory diagram of pulses corresponding to the reel of the embodiment.

FIG. 4 is an explanatory diagram of a conversion coefficient updating operation according to the embodiment.

[Explanation of symbols]

 1 magnetic tape 2 supply reel 3 take-up reel 10 pulse generator 11 pulse counter 12 cycle detection unit 13 switch 14 linear time conversion unit 15 coefficient setting unit 16 display driver 17 display unit 18 controller

Claims (2)

[Claims] 1. A tape running display device for displaying a value relating to tape running when running a tape between a plurality of reels, a pulse generating means for generating a pulse synchronized with the rotation of one reel, and the pulse. A pulse counter means for generating a count value according to the rotation of the reel based on the pulse from the generating means, a cycle detecting means for detecting the cycle of the pulse from the pulse generating means, and a cycle from the cycle detecting means. Conversion coefficient calculation means for calculating the conversion coefficient using the information, and calculation using the conversion coefficient calculated by the conversion coefficient calculation means for the count value from the pulse counter means, depending on the tape running amount. Linear time information output means for generating linear time information as a time value, and linear time information output means for outputting linear time information A tape running display device comprising: display means for performing a display operation using time information; 2. The tape according to claim 1, wherein the conversion coefficient calculation means re-executes the calculation of the conversion coefficient at a required time and updates the conversion coefficient used in the linear time information output means. Running display device.