JP2810212B2 - Tape speed controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a tape speed control suitable for preventing a tape from being damaged due to a tape speed change at the time of fast forward or rewind. Related to the device.

2. Description of the Related Art Conventionally, a magnetic tape has been pulled out from a cassette having a pair of reel hubs on a winding side and a supply side and wound around a rotating drum on which a plurality of magnetic heads are mounted at a predetermined angle to record and reproduce information signals. Various types of cassette type magnetic recording / reproducing apparatuses have been developed. In such a magnetic recording / reproducing apparatus, there are known two driving systems, a reel driving system and a capstan driving system, for driving a high-speed tape such as fast-forwarding or rewinding the magnetic tape wound around a rotating drum. In the capstan drive system, the tape travels less than the number of rotations of the capstan motor because the tape is sent out with a capstan shaft having a small diameter. The limit is about several times the tape speed.

On the other hand, in the reel drive system, a tape speed of 20 to 30 times or more of the tape speed at the time of recording is possible, and this reel drive system is mainly used as a high-speed tape running means such as fast forward or rewind.

In the case of running the tape by the reel drive system, the most problematic is the tape speed control system. That is, if the tape running control is performed simply by using the frequency signal from the frequency generator attached to the reel motor as the control signal, problems such as a change in the tape running speed depending on the tape winding diameter occur.

As a means for solving such a problem, for example,
As described in JP-A-302454, driving of a winding motor necessary to always maintain a constant tape speed with respect to a change in the tape diameter from the beginning to the end of winding on the winding side. The voltage, in other words, the speed control signal, has a pre-stored storage means, and the tape speed related to the tape winding diameter obtained from the tape speed detection means provided in relation to the motor for driving the take-up reel. There is a method in which a speed control signal stored in the storage means is referred to by a signal, and the speed control signal referred to is fed back to the drive motor.

According to this method, the tape can be fast-forwarded or rewound at a constant tape speed regardless of the tape diameter.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, a motor, a cassette, and a mechanical system to be used are assumed, and the motor is supplied to a motor that always keeps a constant tape speed with respect to a change in the tape winding diameter. The drive voltage is stored in the ROM in advance. Therefore, in the case of a magnetic recording / reproducing apparatus that requires tape speed control at many types of speeds, it is necessary to prepare ROMs corresponding to the number of types, and it is necessary to set many types of ROMs and read ROMs at the time of tape speed control. In such a case, there is a problem that switching becomes very complicated and the like.

Furthermore, there is no mention of the tape speed control at the time of switching of the tape running speed including the start and stop of the tape running.For example, the tape is changed by switching the ROM or by changing the dividing ratio of the speed detection signal. When performing speed switching, the level of the tape speed control signal changes extremely,
As a result, there is a problem that tape slack or high tape tension is generated, and the tape is damaged.

An object of the present invention is to realize a tape running at a constant speed for any of a number of set speeds without the need for complicated setting and switching, in view of the above-described conventional technology, and to change the tape at the time of tape speed switching. An object of the present invention is to provide a magnetic recording / reproducing apparatus having a tape speed control device that does not cause damage.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method in which data corresponding to the amount of magnetic tape wound on a reel with respect to the rotation speed of the reel when the tape is run at a predetermined speed. When the stored ROM is prepared and fast-forwarded or rewound, the tape is first run at the above-mentioned predetermined speed by the capstan, and the ROM is stored in the ROM according to the rotation speed of the take-up reel and the supply-side reel at that time. The stored tape amount data is referred to, and the referred tape amount data of the take-up reel is added to the tape amount data of the supply reel to obtain addition data 1.

Next, the drive is switched from the capstan drive to the reel drive, and the tape is run at a speed of K times (K is a real number) the predetermined speed. At this time, the tape amount data stored in the ROM is referred to by reference to speed data of 1 / K times the rotation speed of the take-up reel and 1 / K times the rotation speed of the supply reel. The tape amount data of the take-up reel and the tape amount data of the supply reel are added to obtain additional data 2. At the same time as the tape speed switching, the reference data is switched from the data at the level of the additional data 1 to the data at the level based on the tape speed ratio K / 1. The level of the reference data is increased or decreased so as to be equal.

When the tape running at a speed K times the predetermined speed is stopped, the level of the reference data, which is the same as the level of the additional data 1, is set at the time when the tape running is stopped after a predetermined time from the tape running designation command. The level of the reference data is increased or decreased so that the data has a level corresponding to the tape winding amount data.

Then, a difference between the reference data and the addition data 2 is calculated, and the difference data is fed back to the drive motor as a tape speed control signal.

[Operation] By the tape speed control based on the feedback described above, the addition data 2 is controlled so as to follow the reference data.

Here, the data stored in the ROM is easily calculated based on the reel hub diameter, the tape thickness, and the tape speed.
Further, the tape can be run at a speed equal to the predetermined speed by the capstan drive. Therefore, the tape is stored in the ROM referred to by the rotation speed of the take-up reel and the rotation speed of the supply reel at this time. The above-mentioned additional data 1 of the tape amount data is data corresponding to the total amount of tape wound on both the reels on the winding side and the supply side, and this data does not depend on the tape diameter or the tape speed. , Always constant.

Also, the rotation speed data of 1 / K times the rotation speed of the reel when the tape is run at a speed K times the predetermined speed is:
This corresponds to the rotation speed data of the reel when the tape is run at the predetermined speed. Therefore, when the tape runs at a speed equal to K times the predetermined speed, the tape stored in the ROM referenced by the rotation speed data of 1 / K times the rotation speed of the winding side and the supply side reel. The addition data 2 of the quantity data is equal to the addition data 1.

However, since the tape speed immediately after the above-mentioned tape speed switching is equal to the predetermined speed, the added data 2 is data having a level obtained by multiplying the level of the added data 1 by a numerical value based on the tape speed ratio K / 1. Therefore, the reference data is switched to data of a level obtained by multiplying the addition data 1 by the numerical value simultaneously with the switching of the tape speed, and after a predetermined time, the data is increased to have the same level as the addition data 1. Is controlled so that the addition data 2 follows the reference data that changes to the following.

Similarly, when the tape running is stopped, the addition data 2
Is controlled so as to follow reference data that gradually changes from data at the same level as the addition data 1 to data at a level corresponding to the tape winding amount data when the tape running is stopped for a predetermined time.

As a result, when the tape speed is switched, the tape speed gradually changes according to the reference data, and starts or stops for a predetermined time without causing a large fluctuation in the tape tension, that is, without causing damage to the tape. The tape speed is always controlled to a constant tape speed (a speed equal to K times the above-mentioned predetermined speed, or a speed of 0, that is, stop).

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a tape speed control device in a magnetic recording / reproducing apparatus to which the present invention is applied.
FIG. 3 is a plan view showing an example of the configuration of a magnetic recording / reproducing apparatus to which the present invention is applied. FIG. FIG. 4 is a block diagram showing an embodiment of the reference data generation circuit according to the present invention, FIG. 5 is a waveform diagram of each part for explaining the operation of the reference data generation circuit shown in FIG. 4, and FIG. FIG. 7 is a block diagram showing an embodiment of a tape total winding amount data detecting circuit according to the present invention, and waveform diagrams of respective parts for explaining the operation thereof. FIG. FIG. 3 is a block diagram showing an embodiment and waveform diagrams of respective parts for explaining the operation thereof.

First, the configuration and operation principle of a tape speed control device in a magnetic recording / reproducing apparatus to which the present invention is applied will be described with reference to FIGS.

In FIG. 2, the magnetic tape 10 is supplied to a supply reel 12 or a take-up reel in a tape cassette 11 by a cylinder entrance side tape height regulation guide 14, an inclined guide 15, and a cylinder exit side tape height regulation guide 18 and an inclined guide 17. It is pulled out from the side reel 13 by a loading operation and wound around a rotating drum 16 having a magnetic head by a predetermined angle. And
The tape 10 is clamped by a capstan 19 and a pinch roller 20, and an information signal is recorded while running at a predetermined speed.

Here, in the same figure, the supply side reel 12 and the take-up side reel 13
Each of them has a supply-side reel drive motor and a take-up side reel drive motor.
The configuration is such that each of the take-up reels 13 can be separately driven to rotate. Then, the tape 10 is fast-forwarded or rewound in the same manner as in recording, that is, in a state where the tape 10 is wound around the rotating drum 16 at a predetermined angle.
This is performed by driving 13 or driving the supply reel 12. At this time,
If the rotation speeds of the drive-side reels 12 and 13 are controlled to be constant, the running speed of the tape 10 depends on the winding amount of the tape 10 wound on the driving reels 12 and 13, that is, when the winding amount is large. The tape speed increases because the tape diameter of the reel increases, and the tape speed increases because the tape diameter of the reel decreases, and the tape speed decreases when the tape winding amount is small. There is no control.

Therefore, the addition data of the tape winding amount wound on the supply reel 12 and the winding reel 13, that is, the cassette 11
The total winding amount of the tape wound on the tape does not depend on the tape winding diameter and is always constant, so the data corresponding to the total winding amount of the tape is obtained at the time of fast-forward or rewind. By controlling the tape speed, the tape speed can be kept constant. That is, as shown in FIG. 3, the relationship between the rotation speed of the reel at a predetermined speed, for example, the tape speed at the time of recording, and the winding amount of the tape 10 wound on the reel is obtained. The relationship between the reel rotation speed and the tape winding amount is
Tape speed: Vmm / sec, tape thickness: dmm, reel hub diameter: Rm
m, reel rotation speed: n rotations / second, tape winding amount: lmm, tape winding diameter: R'mm Eliminating R 'from (i) and (ii) gives Holds. Therefore, if the tape speed V (mm / sec), the tape thickness d (mm), and the reel hub diameter R (mm) are known, the relationship between the reel rotation speed and the tape winding amount of the reel can be theoretically obtained. Further, the data amount corresponding to the tape winding amount of the reel is the time until the tape 10 runs out from the reel when the tape is fed from the reel at a predetermined tape speed, that is, the data amount corresponding to the remaining tape time. When the tape winding amount is 0, the time 0
When the tape winding amount is L, it corresponds to the time T. Then, when the tape winding amount and the time are converted into, for example, 8-bit data, the tape winding amount is 0, the time 0 is data 0, the tape winding amount L, and the time T is data 255.

In FIG. 3, when fast-forwarding or rewinding is performed at a tape speed of K times the predetermined speed, the reel rotation speed is multiplied by 1 / K in order to be applicable to FIG. Is also multiplied by 1 / K. At this time, the tape speed multiplied by 1 / K is set to v (mm / sec), and the predetermined tape speed is set to v (m
m / sec), the tape winding amount of the supply-side reel 12 when the tape is run at a predetermined speed is L _S , the above time is t _S , and the winding-side reel
The tape winding amount of the supply-side reel 12 when the tape is run at the speed v is represented by L _T , the above-mentioned time being t _T, and
L _S ′, the above time is t _S ′, the tape winding amount of the take-up reel 13 is L _T ′, and the above time is t _T ′. Holds. Therefore, Becomes here, It is. Therefore, the rotation speed of the supply side reel 12 is 1 / K
The time t _S ′ (= data corresponding to the tape winding amount L _S ′) obtained from the characteristic diagram shown in FIG.
Is multiplied by 1 / K and the time t _T ′ (= data corresponding to the tape winding amount L _T ′) obtained from the characteristic diagram shown in FIG. 3 is added, and this added data and the time T ( By feeding back the difference data from the data corresponding to the total tape winding amount L) to the drive-side reel motor, the tape speed multiplied by 1 / K is controlled to be equal to the predetermined speed. That is, the tape speed is controlled so as to actually run at a speed equal to K times the predetermined speed. As described above, in this tape speed control method, the tape running speed at an arbitrary speed can be controlled to be constant only by changing K.

However, immediately after K is changed, that is, when the tape speed is changed, the difference data becomes large. If the difference data is fed back to the drive-side reel motor, acceleration or deceleration is sharply performed, and high tape tension or tape slack occurs. For example, N ₂ tape speed from N ₁ speed in a predetermined speed
In the case of changing the speed to double speed, the rotation speed of the reel is changed from 1 / N ₁ time to 1 / N ₂ times, and it corresponds to the amount of tape wound on both reels according to the characteristic diagram shown in FIG. Data is detected. Immediately before this speed change, the reel rotation speed is set to 1 /
N is multiplied by ₁ to correspond to the characteristic diagram shown in FIG. 3. The tape speed corresponds to a predetermined speed. Data is output.

In contrast, immediately after the speed change, the tape speed despite the N ₁ speed is continued, the rotation speed of the reel
Because it is _two-fold 1 / N, the data corresponding to the amount of tape which is wound on both reels to be detected, for a given speed in the characteristic diagram shown in FIG. 3, the tape speed is N ₂ / N The added data of the tape winding amount of both reels detected because it corresponds to ₁ × speed is data equivalent to N ₂ / N ₁ time at the predetermined speed, that is, N ₁ / N ₂ times of the total tape winding amount data. The corresponding data is output, and the difference from the tape total winding amount data, which is the reference data, becomes large, and the above-described problem occurs.

Therefore, when changing the tape speed from N ₁ times the predetermined speed N _2, at the same time to change the rotation speed of the reel 1 / N ₂ times ₁ time 1 / N, the reference data tape total wound amount Is changed to data having a level of N ₂ / N ₁ times the total tape volume data, and the reference data is increased or decreased so that the reference data becomes the total tape volume data after a predetermined time 1. . With this configuration, the difference between the tape winding amount addition data of both reels and the reference data at the time of tape speed switching is 0, and the difference between the tape winding amount addition data of both reels and the reference data is 0. Since the feedback control is performed as described above, the addition data of the tape winding amount of both reels also acts to increase or decrease following the increase or decrease of the reference data after the tape speed switching. That is, the tape speed is reduced or accelerated. Thus, after changing tape speed, is gradually accelerated or decelerated, becomes a rate equal to N ₂ times the predetermined speed after a predetermined time 1, when changing tape speed, tape speed control etc. high tape tension and tape slack does not occur It becomes possible.

The tape speed control means based on the principle described above is performed as follows.

In FIG. 1, the rotation speed signal A from the rotation speed detection circuit 1 of the take-up reel 13 is a signal proportional to the rotation speed of the take-up reel 13, and the tape speed is set to K at a predetermined speed.
In order to control at a speed equal to twice, it is multiplied by 1 / K in the divider 3. Similarly, the rotation speed signal A 'from the rotation speed detection circuit 2 of the supply reel 12 is a signal proportional to the rotation speed of the supply reel 12, and is used to control the tape speed at a speed equal to K times the predetermined speed. Is multiplied by 1 / K in the divider 4. Here, the dividers 3 and 4 are supplied with the division ratio K via the terminal 300 based on the tape speed information from the system controller 108.
Is determined.

The rotation detecting circuits 1 and 2 and the dividers 3 and 4 are constituted, for example, by a block diagram shown in FIG.

In FIG. 7 (a), reference numeral 22 denotes a take-up frequency generator attached in connection with the take-up reel drive motor 13, and reference numeral 23 denotes a supply side attached in connection with the supply-reel drive motor 12. In the case of a frequency generator, for example, when detecting the rotation state itself by magnetic means, a magnet is formed on a rotating disk, and a magnet is
6,47 are arranged. From the magnetic detecting elements 46 and 47, signals FG31 (FG31 in FIG. 7B) and FG41 having a frequency proportional to the rotation speed of the take-up reel 13 and the supply reel 12 are output.
(FG41 in FIG. 7 (b)) is output and divided by the frequency dividers 40 and 41.
Divided to / K. The output signals FG32 and FG42 from the frequency dividers 40 and 41 divided by 1 / K (FG32 and FG42 in FIG. 7 (b), however, in this embodiment, both are divided by 1/4) , Are supplied to respective clock terminals of the counters 42 and 43 and counted. This counter 4
Count output signals M, M 'from 2, 43 (m, m' in FIG. 7 (b))
Is input to each of the latch circuits 44 and 45, and is latched at the rising edge of a latch pulse signal H '(h' in FIG. 7B) having a predetermined period and supplied via the terminal 150. At this time, the counters 42 and 43 are reset by the reset pulse signal I '(i' in FIG. 7B) supplied via the terminal 140 immediately after the rise of the latch pulse signal H '. The count output signals M, M 'of the counters 42, 43 are, for example, 0, 1, 2, ..., n-1, n, 0, 1, ... as shown by m, m' in Fig. 7 (b).
... and 0,1,2, ..., n'-1, n ', 0,1,2, ... Then, the count output signals M and M 'are latched by the latch circuits 44 and 45, and data n and n' are output. The data n and n 'depend on the tape winding diameter and are proportional to the tape speed, that is, the rotation speed of the reel. Output signals B and B 'from the latch circuits 44 and 45 are supplied to the tape amount data storage circuits 5 and 6 via terminals 160 and 170. In FIG. 7 (a), the frequency dividers 40 and 41 are arranged in front of the counters 42 and 43. This is because the dividers 42 and 43 can operate even if their dynamic ranges are small. If the dynamic range of the counters 42, 43 is neglected, the frequency dividers 40, 41 can be placed after the counters 42, 43 and after the latch circuits 44, 45.
The reel rotation speed data B, B 'output via 0, 170 have the same value.

The tape amount data storage circuits 5, 6 to which the reel rotation speed data B, B 'are supplied are tabulated in, for example, a ROM configuration. If the input / output data is, for example, 8 bits as shown in FIG. In response to the input of 8-bit reel rotation speed data of .about.255, 8-bit data of 8 bits corresponding to the winding amount of the tape on the reel is output. The characteristic diagram shown in FIG. 3 shows the relationship between the reel rotation speed when the tape runs at a predetermined speed and the amount of tape wound on the reel. Therefore, when the tape 10 is running at a speed equal to K times the predetermined speed, the tape amount data storage circuit 5 outputs the winding-side reel rotation speed data B divided by 1 / K at that time. Tape winding amount data L corresponding to V _T
T (= data t _T corresponding to the time until the tape 10 runs out from the reel when the tape 10 is unwound from the reel at a predetermined speed) is similarly output from the tape amount data storage circuit 6. Tape winding amount data L _S (= data t _S corresponding to the above time) corresponding to V _S of the supply-side reel rotation speed data B ′ divided by K is output. However, the speed v (= V + Δ) of the tape 10 is, for example, faster than K times the predetermined speed.
V), the tape winding amount data of the take-up reel 13 is L _T (= data t _T corresponding to the above time), and the tape winding amount data of the supply reel 12 is L _S (= the above-mentioned data). corresponding data t _S) despite the time, 1 / K to divide is the take-up reel speed data is _{V T '(= V T +} ΔV T) , and therefore, the amount of tape data storage circuit 5 Is expressed as L _T ′ = L _T ′ as the tape winding amount data L _T ′ corresponding to the rotation speed data V _T ′.
L _T −ΔL _T (= data t _T ′ = t _T −Δt _T ) corresponding to the time until the tape 10 runs out from the reel when the tape 10 is fed from the reel at a speed of v / K is output. , The supply-side reel rotation speed data B ′ similarly divided into 1 / K
Is V _S ′ (= V _S + ΔV _S ), so that the tape amount data storage circuit 6 outputs L _S ′ = L _S −ΔL _S (= the above-described data) as the tape winding amount data corresponding to the rotation speed data V _S ′. Data corresponding to time t _S ′ = t _S −Δt _S ) is output.

Tape amount data C from the tape amount data storage circuits 5 and 6,
C ′ is added by the adding circuit 7, and the added data D from the adding circuit 7 is supplied to one terminal of the subtracting circuit 8, and the other terminal of the subtracting circuit 8 has the reference data E from the reference data generating circuit 9. Is supplied.

The reference data generation circuit 9 is configured, for example, as shown in FIG. 4, and the tape total winding amount data detection circuit 101 in FIG. 4 is configured, for example, as shown in FIG. 6 (a). In FIG. 6 (a), a take-up side reel drive motor
Winding frequency generator 22 mounted in connection with 13
(For example, a magnet is formed on a disk and detected by a magnetic detection element 46 disposed opposite thereto) and a supply-side frequency generator 23 (for example, A magnet is formed on a disk, and is disposed opposite to the magnet and detected by the magnetic detecting element 47). From the magnet, a signal FG11 having a frequency proportional to the rotation speed of the take-up reel 13 and the supply reel 12 (sixth FG11 in FIG. 6B and FG21 (FG21 in FIG. 6B) are detected and supplied to frequency dividers 26 and 27. At this time, the capstan drive command G is output via the terminal 115.
(G in FIG. 6 (b)) is supplied to the capstan servo circuit 24, and the capstan control signal from the capstan servo circuit 24 is supplied to the capstan motor 19 via the capstan driver circuit 25 and The motor 19 is controlled at a constant rotation speed. As a result, the tape 10 is running at a speed equal to, for example, K 'times the predetermined speed. Therefore, the frequency of the output signals FG11, FG21 from the generators 22, 23 is divided by the dividers 26, 27 to 1 / K '. The output signals FG12, FG22 from the frequency dividers 26, 27 divided by 1 / K '(FG in FIG. 6B)
12, FG22, but in this embodiment both are divided by 1/2)
Are supplied to the clock terminals of the counters 28 and 29 and counted. The count output signals J, J 'from the counters 28, 29 (the sixth
(J, j 'in FIG. 6B) are input to the latch circuits 30 and 31, respectively, and output from the AND circuit 37 of the latch pulse signal H having a predetermined period and the capstan drive command G supplied through the terminal 120. Signal, i.e. terminal 120 during the capstan drive period.
The latch pulse signal H ″ of a predetermined cycle supplied through
(H ″ in FIG. 6 (b)).

In addition, at this time, the output signal from the AND circuit 35 of the reset pulse signal I and the capstan drive command G supplied via the terminal 110 immediately after the rise of the latch pulse signal H, that is, the terminal 110 is switched during the capstan drive period. Reset signal I ″ (i ″ in FIG. 6 (b))
Resets the counters 28 and 29 so that the counters 28 and 29
The count output signals J, J 'from 29 are, for example, j, j in FIG. 6 (b).
As shown in j ′, 0,1,2, ……, n ₁ −1, n ₁ , 0,1,2, ……, n ₂
−1, n ₂ , 0,1, …… and 0,1,2, ……, n ₁ ′ −1, n ₁ ′, 0,1,
2,... N ₂ ′ −1, n ₂ ′, 0, 1,. Then, the count output signals J and J 'are latched by the latch circuits 30 and 31, and the data
n ₁ and n ₂ and n ₁ 'and n _2' are output. This latch circuit 3
The data n ₁ and n ₁ ′ from 0 and 31 are data including the time when the capstan is activated, and cannot be said to be reel rotation speed data for a predetermined tape speed. Therefore, in the present embodiment, at least two latch pulse signals H are generated during the period of the capstan drive command G, and the data latched by the second and subsequent latch pulse signals is used for subsequent calculations. I have. Therefore, this latch circuit 30 and
Data n ₂ and n ₂ from 31 'ROM 3 as reel rotation speed data of the take-up side and the supply side for a given tape speed
2 and 33. For example, as shown in FIG. 3, the ROMs 32 and 33 are configured to output data corresponding to the tape winding amount of the reel in response to the input of the reel rotation speed data at a predetermined tape speed. . Therefore,
D2 is output from the ROM 32 as data K (k in FIG. 6B) corresponding to the amount of tape wound on the take-up reel, and the ROM 33 corresponds to the amount of tape wound on the supply reel. As data K '(k' in FIG. 6 (b))
D2 'is output. The data K and K 'from the ROMs 32 and 33 are added by the adder 34, and as a result, the data E corresponding to the total winding amount of the wound magnetic tape 10 on the take-up reel 13 and the supply reel 12 is added. The signal is output from the circuit 34 and supplied to the level coincidence detection circuit 102 and the multiplication circuit 103 shown in FIG. In the multiplication circuit 103, the system controller 1
Tape speed ratio when changing from the tape speed ratio data or velocity equal to the tape speed N ₁ times the predetermined speed to the speed equal to N ₂ times the predetermined speed switches from 08 data N ₂ / N
The total tape winding amount data from the flop total wound amount data detecting circuit 101 N ₂ / N _1-fold by _1. In this embodiment, a case is shown in which the tape speed is changed from a predetermined speed, ie, +1 times speed, to a speed equal to K times the predetermined speed, ie, K times speed. Therefore, when the tape speed is changed from +1 times speed to K times speed, the tape total winding amount tape is multiplied by K / 1 by the tape speed ratio data K / 1 from the system controller 108.
The multiplied signal is supplied to the preset terminal of the count circuit 106 via the switch circuit 105. The preset data from the multiplying circuit 103 is preset by a preset command pulse 9C (9c in FIG. 5) output from the system controller 108 when the tape speed is switched. The counter 106 is supplied with an UP / DOWN command 9D (9d in FIG. 5) from the system controller 108 and a high-frequency clock 9F (9f in FIG. 5) from the oscillator 52. This UP / DOWN
Command 9D is High when shifting from high speed to low speed mode.
Level, that is, UP count command, and when shifting from low-speed mode to high-speed mode, low level, that is, DOW
The clock 9F is a signal serving as an N count command, and the clock 9F is a predetermined time 2 from the start / stop of the tape running, that is, a tape running command 9A from the system controller 108 (9a in FIG. 5).
Pulse generation circuit 107 triggered by rising and falling edges of
From the pulse signal 9B having the pulse width of the predetermined time 2 (FIG. 5)
9b) The High level period and the output data E from the counter 106 (e in FIG.
From the level matching circuit 102 until it becomes equal to the level of the total tape amount data from the
The output signal from the oscillator 52 is supplied to the AND circuits 111 and 113 and the OR circuit 11 only during the period when ▼ (▲ in FIG. 5) is at the high level.
By 2 the value is supplied to the counter 106. In this embodiment, +
Since the case where the speed is changed from 1 × speed to K × speed is shown, the output signal E from the counter 106 is supplied by the preset command pulse 9C (9c in FIG. 5) from the system controller 108 as shown in FIG. 5E. Preset data at a level of K / 1 times the tape total winding amount data from the multiplier 103 is preset, and the clock 9F from the oscillator 52 is input by the UP / DOWN command 9D (9d in FIG. 5) from the system controller 108.
(9f in FIG. 5) is counted down. And the counter
In step 106, the DOWN count is continued until the output signal E is detected by the level coincidence detection circuit 102 to be the same level as the level of the total tape winding data from the tape total winding data detection circuit 101. That is, the output signal ▲ ▼ (the fifth signal) from the level coincidence detection circuit 102 which receives the tape total winding amount data and the output signal E from the count 106 as input signals.
The DOWN count is continued until ▲ ▼ in the figure becomes a low level signal. As a result, the output signal E from the counter 106 becomes the total winding amount data of the tape when the tape speed is switched.
It becomes K / 1 times the level of data and decreases until it becomes the same level as the tape total winding amount data after a predetermined time. After the predetermined time 1, the same level as the tape total winding amount data until the tape speed is switched again. Data is continued. The counter that changes the level when the tape speed is switched as described above
The output signal E from 106 is supplied to a subtraction circuit 8 via a terminal 200.
Supplied to the other one. The difference between the addition data D from the addition circuit 7 and the reference data E from the reference data generation circuit 9 is calculated by the subtraction circuit 8, and the difference data F from the subtraction circuit 8 is used to control the driving motor via the terminal 100. Output as a signal.

As described above, according to the present invention, when fast-forwarding or rewinding by reel driving, first, at least a period equal to N 'times the predetermined speed by the capstan during a period in which a latch pulse signal of a predetermined period of two pulses is generated. Run the tape at the speed. At this time, a frequency signal proportional to the rotation speeds of the winding reel and the supply reel is output. The output signal from the winding frequency generator and the output signal from the supply frequency generator are each 1 / 1N. ', And the ROM which outputs data corresponding to the tape winding amount of the reel in response to the input of the reel rotation speed data at a predetermined tape speed is read from the ROM by the tape winding amount wound on each reel. Is obtained, and the sum is added to obtain the total tape winding amount data. Next, when to run the migration to the tape speed to the reel driven by N ₁ times the predetermined speed, both the output signal from the frequency generator respectively 1 / N ₁ frequency division, the same configuration as the ROM The data corresponding to the tape winding amount wound on both reels obtained by the ROM is added, and the difference data between the added data and the reference data at the same level as the above-described total tape winding amount data is used as the driving reel motor Feedback is provided as a control signal.
Further, when switching the tape speed N ₂ times N ₁ times the predetermined speed, the speed switching in synchronization with the tape total wound amount data rate switching ratio N ₂ / N ₁ times the level of the data relative to the After a predetermined time 1, the reference data is increased or decreased so as to be at the level of the total tape winding amount data. The difference data between the addition data and the reference data is fed back as a control signal for the drive-side reel motor.

Thus, the addition data is controlled to be equal to the reference data, resulting tape, the N ₁ speed
Gradually changed to N ₂ × speed, the predetermined time 1 hereinafter can be controlled so that the vehicle travels with N ₂ speed.

In the above embodiment, the reel rotation speed detecting means is
Although the case where the output signal from the frequency generator detected within a predetermined time is counted has been described, the present invention is not limited to this, and can be applied to the case where one cycle of the output signal from the frequency generator is detected. is there. For example, as shown in FIG. 8, a signal 0 (o in FIG. 8B) having a very high frequency compared to the frequency of the output signal from the frequency generators 22 and 23 is output from the oscillator 52, The clock is supplied to each of the clock terminals 53 and 54 and counted. The count output signals from the counters 53 and 54 are input to latch circuits 55 and 56, respectively. In the latch circuit 55, a signal P (p in FIG. 8 (b)) having a frequency proportional to the rotation speed of the winding reel 13 from the winding frequency generator 22 is reduced to 1 / K by the frequency divider 40. The latched signal is latched at the rising edge of the frequency-divided latch pulse signal Q (q in FIG. 8 (b), however, frequency-divided to 1/4 in this embodiment). The pulse signal Q from the frequency divider 40 is also supplied to the reset pulse signal generation circuit 50, and the reset pulse signal R is generated from the reset pulse signal generation circuit 50 immediately after the rise of the latch pulse signal Q.
(R in FIG. 8B) is output, and the counter 53 is reset by the reset pulse signal R.

Similarly, in the latch circuit 56, the frequency signal P '(p' in FIG. 8 (b)) from the supply-side frequency generator 23 is divided by the frequency divider 41 into 1 / K and the latch pulse signal Q '( FIG. 8 (b)
Q '(however, the frequency is divided by 1/4 in this embodiment)). The pulse signal Q 'from the frequency divider 41 is supplied to a reset pulse signal generation circuit 51, and the reset pulse signal generation circuit 51 outputs the reset pulse signal R' (the first pulse signal R ') immediately after the rising of the latch pulse signal Q'. 8 (b) is output, and the counter 54 is reset by the reset pulse signal R '.

Latch output data S, S 'from these latch circuits 55, 56
(S, s' in FIG. 8 (b)) corresponds to the reel rotation speed data, and corresponds to the amount of tape wound around the reel in response to the input of the reel rotation speed data via the terminals 180 and 190, respectively. The corresponding data is supplied to the ROM to be output. However,
The values n and n 'of the latch output data S and S', which are the reel rotation speed data, take a small value as the reel rotation speed increases and take a large value as the reel rotation speed decreases, as described up to FIG. The direction of increase / decrease of the reel rotation speed data is opposite to that in the case where The ROM described up to FIG. 7 cannot be applied. For example, in the characteristic diagram shown in FIG. 3, the increase / decrease direction of the reel rotation speed data on the vertical axis is reversed, that is, the rotation speed at the time of the tape winding amount L. A ROM is used in which the data is set to 0 and the rotation speed data when the tape winding amount is 0 is set to 255.

The present invention is also applicable to the reel rotation speed detecting means described above.

In the above embodiment, the tape 10 is run at a constant speed by the capstan as the tape total winding amount data detecting means, and the amount of tape wound on both reels is detected from the frequency signal from the frequency generator at that time. Mentioned the case,
The present invention is not limited to this, but can be applied to all means for running the tape at a constant speed. For example, as shown in FIG. 11, a control signal of a predetermined frequency recorded at the lower end or the upper end of the tape at the same time as the recording of the information signal is detected by the control head 59, and the reel servo circuit 61 via the control signal amplifier 60, and For example, it is supplied to a control signal presence / absence detection circuit 62 constituted by a retriggerable monomultivibrator. For example, when there is a control signal, a “High” level signal is output from the presence / absence detection circuit 62, and when there is no control signal, a “Low” level signal is output to the switch circuit 63. The switch circuit 634 switches to the reel servo circuit 61 when the level of the output signal from the presence / absence detection circuit 62 is “High”, and switches to the subtraction circuit 8 when the level of the output signal is “Low”.
Therefore, when there is a control signal, a control signal is output from the reel servo circuit 61 so that the frequency of the control signal becomes equal to, for example, K ″ times the predetermined frequency. The tape 10 is supplied to a reel motor driver circuit, so that the tape 10 runs at a speed equal to K ″ times the predetermined speed. At this time, the reel rotation speed detection circuit 1 on the winding side and the supply side,
Reel rotation speed data from 2 is divided by dividers 64 and 65
The data is multiplied by 1 / K "and supplied to the ROMs 66 and 67, which output data corresponding to the amount of tape wound on the reel in response to the input of the reel rotation speed data. Data corresponding to the tape amount wound on each of the side reel 13 and the supply side reel 12 is output and added to the addition circuit 68, and the total tape winding amount is obtained as data, which is used as reference data. The signal is supplied to the subtraction circuit 8. Then, when the vehicle runs in the tape area where the control signal is not detected, the output signal level from the presence / absence detection circuit 62 becomes "Low", and the switch circuit 63 is switched to the subtraction circuit 8 side. The tape speed control described above up to Fig. 8 is performed, and the tape is run at a speed equal to K times the predetermined speed, where K "
If = K, it goes without saying that the tape speed can be set to K (= K ") times the predetermined speed regardless of the presence or absence of the control signal.

Further, in the above embodiment, the case where the tape amount wound on both reels is detected by the frequency signal from the frequency generator when the tape 10 is run at a constant speed as the tape total winding amount detecting means has been described. However, the present invention is not limited to this, and can be applied to a case where the tape cassette 11 is provided with information indicating the total amount of tape wound in the cassette.
For example, as shown in FIG. 2, a detection hole 21 is provided in the cassette 11, and the detection hole 21 is detected by a switch 21 'to obtain data on a total tape winding amount. When the detection hole on the terminal 1 side is closed, the switch on the side of the terminal 1 is pressed, and the terminal 1 is electrically connected to the grounded common terminal.
(= "0") is detected. Conversely, if the detection hole is open, the terminal 1 detects "High" (= "1"). Terminal 2 is also detected in the same manner. For example, if terminals 1 and 2 are "0" and "0", the total tape winding amount is 15 minutes, and if terminals 1 and 2 are "1" and "0", it is 30 minutes.
“0” and “1” indicate 45 minutes, and “1” and “1” indicate 60 minutes. As described above, the present invention is also applicable to the case of detecting the tape total winding amount data.

Further, in the above embodiment, the case where the tape 10 is constantly moved and detected as the tape total winding amount detecting means,
Although the case where the detection is performed by the detection holes 21 provided in the 11 has been described, the present invention is not limited to this, and is also applicable to the case where the detection is performed by tape loading. For example, since the amount of tape drawn out of the cassette 11 by the tape loading from the cassette 11 is constant, one of the reels 1 is set to the brake state while the predetermined amount of tape is pulled out during the tape loading, and the tape 10 is drawn only from the other reel 2. Then, the reel 1 is set in the non-brake state and the other reel 2 is set in the brake state, and the tape 10 is fed only from the reel 1 until the tape loading is completed.
The present invention is also applicable to a case where the amount of tape wound on each reel is detected from the relationship between the tape feeding amount and the reel rotation speed at that time, and the total tape amount data is detected by adding the detected amounts. Applicable.

Further, in the above embodiment, the tape 10 is run at a constant speed by the capstan as the tape total winding amount data detecting means. At this time, the frequency power generation provided in association with each reel motor detected within a predetermined time is performed. However, the present invention is not limited to this, and the tape 10 is run at a constant speed by the capstan 10, and the high speed is obtained in the same manner as the reel rotation speed detecting means shown in FIG. The total amount of tape wound by adding the amount of tape wound on the reel obtained by detecting the period of the output pulse signal from the frequency generator provided on each reel using an oscillator that generates a frequency clock signal The present invention is applicable to the case of detecting data.

Also said a case where switching to N ₂ speed tape speed from N ₁ speed, but the present invention is not limited thereto in the above embodiment, the tape speed 2 ^N times speed (N is an integer) is set to the tape speed
N _3-speed from N ₁ speed _{(N 3 = N 1 × 2} ± n, n is an integer) when switching on, the speed value N ₂ as ^{_{N 2 = N 1 × 2 ±}} 1, from N ₁ speed
The present invention can be applied to the case where the switching to the N ₂ × speed is sequentially repeated n times. That is, as shown in FIG. 9, the tape total winding amount data from the tape total winding amount data detection circuit 101 is supplied to one input terminal of the level coincidence detection circuit 102 and is also supplied to multipliers 121 and 122. , And are supplied to the data selector 123 after being subjected to x2 and x1 / 2. In the data selector 123, the system controller 108
UP / DOWN command to the counter 106 from 10C (10c in Fig. 10)
Accordingly, for example, when switching from low speed to high speed such as 1 × speed to 8 × speed, the output signal from the multiplier 121 is selected by a “Low” level DOWN count command, and conversely, the output signal is changed from 8 × speed to 2 × speed. When switching from high speed to low speed, the output signal from the multiplier 122 is selected by the “High” level UP count command and supplied to the preset data input terminal of the counter 106. In this embodiment, a case where the tape speed is switched from 1 × speed to 8 × speed and from 8 × speed to 2 × speed will be described. Reel rotation speed data from the winding-up and supply-side reel rotation speed detection circuits 1 and 2 are supplied to data selectors 129 and 134 and are also supplied to multipliers 126 and 134.
127, 128 and multipliers 131, 132, 133. Then, at the multipliers 126, 127, 128 and the multipliers 131, 132, 133, the reel rotation speed data on the take-up side and the supply side are respectively × 1/2, × 1/4, ×
After being reduced by 1/8, they are supplied to data selectors 129 and 134.
In the data selectors 129 and 134, a tape speed command 10A (10a in FIG. 10) from the system controller 108, for example, a tape speed command 00 of 1x speed, and a winding speed and a supply side reel rotation speed detection circuit 1, 2 Of the reel rotation speed data is selected, the reel rotation speed data that is 1/2 times the multipliers 126 and 131 is selected by the double speed tape speed command 01, and the multiplier 127 and the multiplier 127 are output by the quadruple speed tape speed command 10. The 1/4 times reel rotation speed data from 132 is selected, the 1/8 times reel rotation speed data from multipliers 128 and 133 is selected by the 8 times tape speed command 11, and the terminals 220 and The data is supplied to the tape amount data storage circuits 5 and 6 via 230. The tape speed command 10A from the system controller 108 (10a in FIG. 10)
Is also supplied to the pulse generation circuit 124, and the tape speed command 1
The preset command pulse signal 10B is output in synchronization with the switching of 0A, and is supplied to the preset command terminal of the counter 106. At the same time, the output signal E (the first
0e in FIG. 0 is supplied to the other terminal of the level coincidence detecting circuit 102, and a level comparison with the total tape winding amount data is performed.
▼ (▲ in FIG. 10) is supplied to the AND circuit 125 and the system controller 108. Thus, when the output signal E from the counter 106 does not match the level of the tape total winding amount data, that is, when the output signal “” from the level match detection circuit 102 is “High”, the oscillator 52
High frequency signal from the clock signal 10E (1 in FIG. 10).
0e) is supplied to the clock terminal of the counter 106.
Further, the system controller 108 detects the "Low" level of the output signal ▲ ▼ from the level match detection circuit 102, that is, the level match detection signal, and outputs the tape speed command 10A.
Switch. According to the circuit operation described above, for example, when switching the speed setting from 1 × speed to 8 × speed, the speed command 10A is synchronized with the switching of the speed setting as shown in 10a of FIG.
The mode is switched from 00 to 01, whereby the preset command pulse 10B (10b in FIG. 10) is supplied to the counter 106, and the data at the level of 2/1 times the tape total winding amount data from the multiplier 122 is preset. You. At the same time, by switching the speed command 10A, the reel rotation speed data that is halved from the multipliers 126 and 131 is selectively output by the data selectors 129 and 134, and the output signal E from the counter 106 is In response to a DOWN count command 10C from the controller 108, the count value is decreased as shown in FIG. Then, the output signal E from the counter 106 is also supplied to the level coincidence detection circuit 102, and the output signal E becomes the same as the level of the tape total winding amount data. That is, when the tape speed reaches the double speed, the output signal from the level match detection circuit 102
▼ becomes “Low” level and the system controller 108
Detects this, and changes the speed command 10A from 01 to 10. As a result, the preset command pulse 10B (10b in FIG. 10) is output from the pulse generation circuit 124, and the counter 10
At 6, the data at a level 2/1 times the total tape amount data from the multiplier 122 is preset. Speed command 10A at the same time
, The reel rotation speed data multiplied by 1/4 from the multipliers 127 and 132 is selectively output by the data selectors 129 and 134, and the output signal E from the counter 106 is set to DOWN from the system controller 108. Count command 1
It decreases as shown by e in FIG. 10 by 0C.

Similarly, the output signal E becomes the same as the level of the tape total winding amount data. That is, when the tape speed reaches the quadruple speed, the data selectors 129 and 134 use the multipliers 128 and 133.
1/8 times the reel rotation speed data from the multiplier 122 is selected and output.
/ 1 times data is preset. Then, when the output signal E from the counter 106 is decreased by the DOWN count command 10C and becomes equal to the level of the total tape winding amount data, that is, when the tape speed reaches 8 times speed, the clock signal 10E ( The supply of 10e) of FIG. 10 is stopped, and thereafter, the total tape winding amount data is continuously output as the reference data unless the tape speed is changed, and the multipliers 128 and 133 are output from the data selectors 129 and 134.
1/8 times the reel rotation speed data is continuously selected and output.

Similarly, when the tape speed is switched from high speed to low speed, for example, from 8 × speed to 2 × speed, the tape speed command 10
In synchronization with the switching of A, 1/4 times the reel rotation speed data from the multipliers 127 and 132 is selectively output by the data selectors 129 and 134, and the preset command pulse 10B output from the pulse generation circuit 124 Data at a level that is 1/2 times the total tape amount data from the multiplier 121 is preset. And UP from the system controller 108
The output signal E from the counter 106 is increased by the count command 10C and becomes equal to the level of the total tape winding amount data, that is, when the tape speed reaches quadruple speed, the data selectors 129 and 134 use the multipliers 126 and Reel rotation speed data that is 1/2 times the data from 131 is selected and output, and data of a level that is 1/2 times the total tape amount data from the multiplier 121 is preset. And the counter 106
10 is increased by the UP count command 10C and becomes equal to the level of the total tape winding data, that is, when the tape speed reaches the double speed, the clock signal 10E to the counter 106 (FIG. 10). 10e) supply is stopped,
Thereafter, as long as the setting of the tape speed is not changed, the tape total winding amount data is continuously output as the reference data, and the reel rotation speed data that is halved from the multipliers 126 and 131 is output from the data selectors 129 and 134. It is selected and output continuously.

Example switching the tape speed N ₃ speed _{(N 3 = N 1 × 2} ± n) from N ₁ speed mentioned above, as reel rotation speed detecting means, the output from the frequency generator is detected within a predetermined time Although the case where the signal is counted has been described, the present invention is also applicable to a case where one cycle of the output signal from the frequency generator is detected.

In the above embodiment has dealt with the case of switching the tape speed from N ₁ × speed N ₂ speed or N _3-speed, the present invention is not limited to this, when switching from K speed to zero speed, namely stop tape running The present invention can be applied to the case where the tape total speed data is detected in advance and the tape speed is switched from 0 × speed to K × speed, that is, when the tape running is started. First, when the tape running is stopped, the UP count command 9D from the system controller 108 is supplied to the counter 106 in FIG.
And a pulse signal 9B (FIG. 5) having a pulse width of a predetermined time 2 from the pulse generation circuit 107 triggered by the fall of the tape running command 9A (9a in FIG. 5) from the system controller 108. 9b), the level match detection circuit 10
The clock signal 9F from the oscillator 52 is forcibly counted during the “High” level of the pulse signal 9B without depending on the output signal ▲ ▼ from 2. When the counting is started, the output signal E from the counter 106 becomes larger than the total tape winding data, so that the output signal ▲ ▼ from the level coincidence detection circuit 102 becomes a “High” level signal and the pulse signal 9B
After the signal goes to “Low” level, the counter 106
The clock signal 9F from 2 is counted. As described above, the UP count is started in synchronization with the tape running stop command, the output signal E (e in FIG. 5) from the counter 106 increases, and the tape speed decreases accordingly. Then, the output signal E from the counter 106 has the same level as the maximum level data in the range that can be taken by the reference data from the maximum level generation circuit 104, that is, the output signal ▼ from the level coincidence detection circuit 109 (the fifth signal). (▲ ▼ in the figure)
The UP count is continued until is at the "Low" level, and when the tape speed is sufficiently low, the tape running is completely stopped by a mechanical brake or the like.

Also, in the case of starting the tape running, in FIG. 4, the DOWN count command 9D and the preset command pulse signal 9C from the system controller 108 are output by the counter.
The maximum level data within a range that can be taken by the reference data from the maximum level generating circuit 104 supplied to the data selector 105 and supplied through the data selector 105 is preset, a DOWN count is started, and the output signal E (the FIG. 5 e) decreases and the tape speed increases. At this time,
The reel rotation speed data A and A 'from the winding side and supply side reel rotation speed detection circuits 1 and 2 are multiplied by 1 / K in the dividers 3 and 4, respectively. Then, the output signal E from the counter 106 decreases and becomes the same level as the tape total winding amount data. That is, the output signal ▼ (▲ in FIG. 5) from the level coincidence detection circuit 102 becomes the “Low” level. The DOWN count is continued until the time is reached, and the tape speed reaches the K speed.

As described above, the present invention is also applicable to the start and stop of tape running.

Further, in the above embodiment, the level of the reference data is switched according to the switching speed ratio at the time of switching the tape speed, and the reference data is increased or decreased to become the same level as the tape total winding amount data after a predetermined time 1. However, the present invention is not limited to this, and the reference data is the total tape winding amount data, and the level of the division ratio K of the dividers 3 and 4 is changed from N ₁ to N ₂ or N ₃ without changing. For example, as a process corresponding to this, the division ratio K of the dividers 40 and 41 is set to 1 in FIG. 8 (a), and the frequency of the output signal 0 from the oscillator 52 is changed according to the tape speed. This does not depart from the gist of the present invention.

[Effects of the Invention] As described above, according to the present invention, at the time of switching the tape speed in fast-forward or rewind by reel driving, the reference data is converted from the tape total winding amount data to the tape total winding amount data. The reference data is increased or decreased so that the data is at the level multiplied by the switching ratio and reaches the level of the total tape winding amount data after a predetermined time. Then, the tape winding amount data of both reels obtained from the rotation speed data of both reels are added, and the driving reel motor is controlled by the difference data between the added data and the above-described reference data whose level changes when the tape speed is switched. Therefore, the tape speed gradually changes, and the tape can be prevented from being damaged due to the switching of the tape speed, so that the reliability of the device can be improved. A magnetic recording / reproducing device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a tape speed control device in a magnetic recording / reproducing apparatus to which the present invention is applied, FIG. 2 is a plan view showing one configuration example of a magnetic recording / reproducing apparatus to which the present invention is applied, FIG. 3 is a characteristic diagram for explaining the storage contents of the tape winding amount data storage circuit according to the present invention and the operating principle of the tape speed control device according to the present invention, and FIG. 4 is an embodiment of the reference data generating circuit according to the present invention. Block diagram, fifth
FIG. 6 is a waveform diagram of each part for explaining the operation of the reference data generating circuit of FIG. 4, FIG. 6 is a block diagram showing one embodiment of a tape total winding amount data detecting circuit, and FIG. FIG. 8 is a block diagram showing an embodiment of a reel rotation speed detection circuit according to the present invention and waveform diagrams of respective parts for explaining the operation thereof. FIG. 8 is a block diagram showing another embodiment of a reel rotation speed detection circuit according to the present invention. Waveform diagrams of each part for explaining the operation,
9 is a block diagram showing another embodiment of the reference data generation circuit according to the present invention, FIG. 10 is a waveform diagram of each part for explaining the operation of the reference data generation circuit of FIG. 9, and FIG. 11 is a tape according to the present invention. FIG. 11 is a block diagram showing another embodiment of the total winding amount data detection circuit. DESCRIPTION OF SYMBOLS 1... Winding-up reel rotation speed detection circuit 2... Supply-side reel rotation speed detection circuit 5, 6... Tape amount data storage circuit 9... Reference data generation circuit 101. Winding amount data detection circuit.

Claims (10)

(57) [Claims] A winding side (1) for winding a magnetic tape (10).
3) A magnetic tape (10) is pulled out of the cassette (11) containing a pair of reel hubs on the supply side (12) to the outside of the cassette and tape-loaded, and a rotating drum (16) having a magnetic head installed outside the cassette is provided. A recording-reproducing apparatus for recording and reproducing an information signal in a manner wound at a predetermined angle around a predetermined angle, and for fast-forwarding or rewinding the magnetic tape (10) in the same manner as in recording and reproducing; A rotation speed detecting means 1 (1) of the take-up reel provided in connection with the drive motor (12), and a rotation speed of the supply reel provided in connection with the supply reel drive motor (12) Detecting means 2 (2) and tape total winding amount data detection for detecting data corresponding to the total winding amount of the magnetic tape (10) wound on both the reels (13) and the supply side (12). Means (1 01) and a tape amount data storage means (5, 5) storing data corresponding to the amount of magnetic tape wound on the reel with respect to the rotation speed of the reel when the tape is run at a predetermined speed.
6) and the rotation speed data 1 from the rotation speed detecting means 1 (1).
Means 1/3 (K = N ₁ or N ₂ , where N ₁ and N ₂ are real numbers), and rotation speed data 2 from the rotation speed detection means 2 (2).
Means 2 (4) for multiplying by 1 / K; tape amount data 1 stored in the tape amount data storage means (5) referred to by the division data 1 from the division means 1 (3); Adding means (7) for adding the tape amount data 2 stored in the tape amount data storage means (6) referred to by the division data 2 from the division means 2 (4); and a magnetic tape (10) fast forward or rewind the tape speed during, from a rate equal to N ₁ times the predetermined speed when switching to the speed equal to N ₂ times the predetermined speed, the reference data,
From the data of the same level as the tape total winding amount data from the tape total winding amount detecting means (101), the tape speed ratio N ₂ / N ₁
Level reference data switching means for switching the data based on the (103), the division ratio switching the value of the division ratio K of the tape speed changing at the same time the dividing means 1,2 (3,4) from N ₁ to N ₂ Switching means (10
8,3,4) and the level of the reference data only during a period corresponding to the predetermined time so that the level of the reference data and the level of the total tape winding amount data are equal after a predetermined time from the tape speed switching. A reference data level increasing / decreasing means (52, 102, 106) for increasing or decreasing the sum, and a subtraction means (8) for calculating a difference between the addition data from the adding means (7) and the reference data. A tape speed control device wherein the tape running speed is controlled based on the difference data from (8). 2. A winding side (1) for winding a magnetic tape (10).
3) A magnetic tape (10) is pulled out of the cassette (11) containing a pair of reel hubs on the supply side (12) to the outside of the cassette and tape-loaded, and a rotating drum (16) having a magnetic head installed outside the cassette is provided. A recording-reproducing apparatus for recording and reproducing an information signal in a manner wound at a predetermined angle around a predetermined angle, and for fast-forwarding or rewinding the magnetic tape (10) in the same manner as in recording and reproducing; A rotation speed detecting means 1 (1) of the take-up reel provided in connection with the drive motor (12), and a rotation speed of the supply reel provided in connection with the supply reel drive motor (12) Detecting means 2 (2) and tape total winding amount data detection for detecting data corresponding to the total winding amount of the magnetic tape (10) wound on both the reels (13) and the supply side (12). means( ) And, tape amount data storing means (5 that stores data corresponding to the magnetic tape amount wound around the said reel with respect to the rotational speed of the reel obtained while the tape running at a predetermined speed,
6) and the rotation speed data 1 from the rotation speed detecting means 1 (1).
Dividing means 1 (3) for multiplying by 1 / K (K is a real number), and rotating speed data 2 from the rotating speed detecting means 2 (2).
Means 2 (4) for multiplying by 1 / K; tape amount data 1 stored in the tape amount data storage means (5) referred to by the division data 1 from the division means 1 (3); Adding means (7) for adding the tape amount data 2 stored in the tape amount data storage means (6) referred to by the division data 2 from the division means 2 (4); and a magnetic tape (10) Means for setting the data at the same level as the level of the total tape winding amount data from the tape total winding amount data detecting means (9) as reference data when fast-forwarding or rewinding at a speed K times the predetermined speed. (101,102,10
6) and when the tape speed at the time of fast-forward or rewind of the magnetic tape (10) is switched from a speed equal to K times the predetermined speed to 0, that is, when stopping the tape running, Reference data for increasing or decreasing the level of the reference data so that the reference data equal to the level of the total tape winding data becomes data of a level corresponding to the tape winding data at the time of stopping tape running after a predetermined time. Level increase / decrease means (101,106,10
9); and subtraction means (8) for calculating a difference between the addition data from the addition means (7) and the reference data. The tape running based on the difference data from the subtraction means (8). A tape speed control device wherein the speed is controlled. 3. A winding side (1) for winding a magnetic tape (10).
3) A magnetic tape (10) is pulled out of the cassette (11) containing a pair of reel hubs on the supply side (12) to the outside of the cassette and tape-loaded, and a rotating drum (16) having a magnetic head installed outside the cassette is provided. A recording-reproducing apparatus for recording and reproducing an information signal in a manner wound at a predetermined angle around a predetermined angle, and for fast-forwarding or rewinding the magnetic tape (10) in the same manner as in recording and reproducing; A rotation speed detecting means 1 (1) of the take-up reel provided in connection with the drive motor (12), and a rotation speed of the supply reel provided in connection with the supply reel drive motor (12) Detecting means 2 (2) and tape total winding amount data detection for detecting data corresponding to the total winding amount of the magnetic tape (10) wound on both the reels (13) and the supply side (12). means( ) And, tape amount data storing means (5 that stores data corresponding to the magnetic tape amount wound around the said reel with respect to the rotational speed of the reel obtained while the tape running at a predetermined speed,
6) and the rotation speed data 1 from the rotation speed detecting means 1 (1).
Dividing means 1 (3) for multiplying by 1 / K (K is a real number), and rotating speed data 2 from the rotating speed detecting means 2 (2).
Means 2 (4) for multiplying by 1 / K; tape amount data 1 stored in the tape amount data storage means (5) referred to by the division data 1 from the division means 1 (3); Adding means (7) for adding the tape amount data 2 stored in the tape amount data storage means (6) referred to by the division data 2 from the division means 2 (4); and a magnetic tape (10) Means for setting the data at the same level as the level of the total tape winding amount data from the tape total winding amount data detecting means (9) as reference data when fast-forwarding or rewinding at a speed K times the predetermined speed. (101,102,10
6) and when the magnetic tape (10) is started from speed 0 to a speed equal to K times the predetermined speed and fast-forwarded or rewound, the reference data is synchronized with the tape running start-up. Reference data setting means (104, 105, 106) for setting data at a level corresponding to the tape winding amount data when the tape running is stopped
And so that the set reference data becomes the same level of data as the tape total winding amount data after a predetermined time,
There are reference data level increase / decrease means (101, 102, 106) for increasing or decreasing the level of the reference data, and subtraction means (8) for calculating a difference between the addition data from the addition means (7) and the reference data. And a tape speed control device for controlling the tape running speed based on the difference data from the subtraction means (8). 4. A means (108) for setting the tape speed at the time of fast-forwarding or rewinding the magnetic tape (10) to K = ^2N times (N is an integer) of the predetermined speed; When switching from a speed equal to N ₁ times the predetermined speed to a speed equal to N ₃ times the predetermined speed (N ₃ = N ₁ × 2 ^± nn is an integer), the above double speed value N _{2 is changed} to N ₂ = N ₁ × 2 ^{± 1}
The division ratio switching means (126, 127, 128, 129, 131, 13
2,133,134) and the reference data switching means (121,122,12)
3) and the above reference data level increase / decrease means (52,106,12)
The tape speed control device according to claim 1, further comprising means (101, 102, 106, 108) for sequentially repeating step 5) n times. 5. The tape total winding amount data detecting means (9).
The tape according to claim 1, 2, 3 or 4, wherein the tape comprises identification data detection means (21, 21 ') provided in advance in the cassette (11) for detecting the total tape winding amount identification data. Speed control device. 6. A tape total winding amount data detecting means (9).
Means (24, 25) for moving the magnetic tape (10) by a capstan (19) at a speed equal to K 'times the predetermined speed (K' is a real number); Rotation speed data 1 from 3)
Dividing means 3 (26) for multiplying by 1 / K ', and rotating speed data 2 from the rotating speed detecting means 2 (4).
Means (4) (27) for multiplying by 1 / K ′, and the tape amount data 3 stored in the tape amount data storage means (32) referred to by the division data 3 from the division means 3 (26). Adding means 2 (34) for adding the tape amount data 4 stored in the tape amount data storage means (33) referred to by the division data 4 from the dividing means 4 (27). Claims
5. The tape speed controller according to 1, 2, 3, or 4. 7. A tape total winding amount data detecting means (9).
Control signal detection means (59) for detecting a control signal of a predetermined frequency recorded at the lower end or upper end of the tape simultaneously with the recording of the information signal; and controlling the control signal detected from the control signal detection means (59). As a signal, the reel motor (12, 13) on the winding side or the supply side outputs the magnetic tape (1).
0) at a speed K ″ times the predetermined speed, and a tape drive control unit (61); and a rotation speed data 1 from the rotation speed detection unit 1 (1).
Dividing means 5 (64) for multiplying the rotation speed by 1 / K ″, and the rotation speed data 2 from the rotation speed detection means 2 (2).
Means (65) for multiplying the data by 1 / K ", and the tape amount data 5 stored in the tape amount data storage means (66) referred to by the division data 5 from the division means 5 (64). Adding means 3 (68) for adding the tape amount data 6 stored in the tape amount data storage means (67) referred to by the division data 6 from the division means 6 (65). The tape speed control device according to claim 1, 2, 3, or 4, wherein 8. A take-up side (13) and a supply side reel (12).
The above-mentioned rotation speed detecting means 1, 2 (1, 2) comprises a winding-side frequency generator (22) which generates a signal having a frequency proportional to the number of rotations of the winding-side (13) and the supply-side reel (12). , 46) and the supply-side frequency generators (23, 47), and the winding-side frequency generators (22, 4
6) a counter 1 (42) for counting the frequency signal 1 and the supply-side frequency generator (2
Counter 2 (43) for counting the frequency signal 2 from (3, 47)
Claim 1, 2, 3, 4, 5, 6, or 7 comprising:
3. The tape speed control device according to 1. 9. A winding side (13) and a supply side reel (12).
The rotation speed detecting means 1, 2, (1, 2) generates a high-frequency signal with the winding-side frequency generator (22, 46) and the supply-side frequency generator (23, 47). An oscillator (52); and a counter 3 (50, 50) that counts the high-frequency signal from the oscillator (52) for a period that is a predetermined multiple of the cycle of the frequency signal 1 from the winding-side frequency generator (22, 46). 53) and a frequency signal 2 from the above-mentioned supply-side frequency generator (23, 47).
And a counter 4 (51, 54) for counting the high-frequency signal from the oscillator (52) for a period of a predetermined number of times of the period of (1). Or a tape speed controller according to 7. 10. The tape amount data storage means (5, 6).
The ROM is configured to store data corresponding to the amount of tape wound on the reel with respect to the reel rotation speed when the tape is run at the predetermined speed. 10. The tape speed control device according to 4, 5, 6, 7, 8, or 9.