JPH03160649A - Tape driving controller - Google Patents

Abstract

PURPOSE:To attain smooth acceleration and deceleration by driving a motor based on the result of a fuzzy logical operation using rotation information on a tape supply reel and a tape take-up reel and information on tape tension. CONSTITUTION:A supply reel rotation detection part 3 and a take-up reel rota tion detection part 6 detect the period of a frequency which changes by the revolving speed of the supply reel 1 and that of the take-up reel 4 and they supply it to a logical operation part 9. A tension addition detection part 8 supplies the tension value for a tape 7 to the part 9. The part 9 executes the fuzzy logical operation by using the revolving period of the reel 1 detected by the part 3 and that of the reel 4 detected by the part 6, and the tape tension value detected by the part 8. A impression voltage obtained by the operation is impressed on a motor 2 or a motor 5 through a motor driving part 10. Thus, the fast-forwarding and rewinding of the tape 7 can be executed by appropriate tape tension.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is applicable to, for example, fast forwarding of a tape in a video tape recorder. This paper relates to a versatile tape drive control device used to control rewinding, etc. [Summary of the Invention] The present invention provides a tape drive control device that performs fast forwarding and rewinding of a tape. Performing fuzzy logical operations based on the information on Tv/Ts and the tape tension information detected by the tape tension addition detection means, when the rotation period of the tape take-up reel is set to
By controlling the voltage applied to the motor that drives the reel based on the result of this calculation, the tape can be fast-forwarded and rewound with an appropriate tape tension even using a simple rotation detection means, resulting in smooth acceleration. This is something that can reduce speed and effectively prevent tape damage. [Prior Art] For example, when fast forwarding or rewinding a tape in a VTR (video tape recorder) at high speed and at a constant speed, a capstan is not used, so a conventional tape drive control device is used. calculates the current position and running speed of the entire tape by detecting the rotation period of the tape take-up reel and fast-forward reel with a rotation detector such as a reel FG (frequency generator) installed on each reel. For example, start-up is performed by increasing the applied voltage supplied to the reel motor in steps so that the rotation speed gradually increases up to the normal rotation speed, and when the running speed reaches the normal speed, the applied voltage is kept constant. When the remaining amount of tape decreases, the voltage applied to the tape is gradually reduced and the speed is gradually reduced. , the end of the tape was detected and stopped. [Problems to be Solved by the Invention] However, in the above-mentioned conventional tape drive control device, in order to keep the tape traveling speed constant, the reel FC must have a constant degree of rotation, and the tension applied to the tape must also be constant. If you try to keep it constant, complicated processing is required. Furthermore, as tapes tend to become thinner in the future, it will be difficult to maintain running performance, and they will be susceptible to various disturbances. Any increase or decrease will damage the tape when starting up or stopping, etc. The present invention has been made in view of the above-mentioned problems, and although it uses the detection output of a simple reel FC, smooth acceleration and deceleration can be performed without damaging the tape, and it can maintain an appropriate speed and speed. The purpose is to provide a tape drive control device that can run the tape under tension. (Means for Solving the Problems) The tape drive control 1n device according to the present invention includes a supply reel rotation detection means for detecting the rotation of a tape supply reel, and a take-up reel rotation detection means for detecting the rotation of a tape take-up reel. , a tape tension addition detection means for detecting the tension applied to the tape, and the supply reel rotation detection means.A fuzzy logic operation is performed using information from the take-up reel rotation detection means and the tape tension addition detection means. The above-mentioned device is characterized by having a logic operation section, a motor that drives the tape supply reel and the tape take-up reel, and a motor drive section that drives the motor in accordance with the output supplied from the logic operation section. Here, as a specific example of the input values for the fuzzy inference in the logic operation section, the rotation period of the tape supply reel supplied by the supply reel rotation detection means is T, and the rotation period of the take-up reel is T. Ty" + Ts" when the rotation period of the tape take-up reel detected by the rotation detection means is T.
, Tt/Ts and the tape tension value detected by the tape tension addition detection means. [Function] The tape drive control device according to the present invention includes the above-mentioned supply reel rotation detection means. A fuzzy logic operation is performed using the information from the take-up reel rotation detection means and the tape tension addition detection means, and the voltage applied to the reel motor is controlled according to the result of this operation, thereby allowing simple reel rotation detection. Even if this method is used, the tape can be smoothly accelerated and decelerated during fast forwarding and rewinding, and tape running can be controlled with appropriate tension and speed, so no damage is caused to the tape. [Embodiments] Hereinafter, embodiments of the tape drive control device according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a tape drive control device according to the present invention. In FIG. 1, the tape drive control device includes, for example, a motor 2 provided on a supply reel l of a video tape recorder, a supply reel rotation detection section 3 that detects the rotation period of the supply reel l, and a winding A motor 5 provided on the take-up reel 4, a take-up reel rotation detection section 6 that detects the rotation period of the take-up reel 4, a tension addition detection section 8 that detects the tension applied to the tape 7, and the above-mentioned Supply reel rotation detection section 3. The output from the upper rudder logic operation unit 9 and a logic operation unit 9 that performs calculations using fuzzy logic, which will be described later, based on each detection information from the take-up reel rotation detection unit 6 and the tension addition detection unit 8 are supplied. , and a motor drive unit 10 that drives the motor 2 and motor 5 based on the supplied output. The supply reel rotation detection section 3 and the take-up reel rotation detection section 6 are, for example, reel FCs (frequency generators), etc., provided on the supply reel L and the take-up reel 4, and the frequency changes depending on the number of rotations of the reel. The period of the frequency is detected and supplied to the logic operation section 9. The tension addition detection section 8 is constructed by attaching, for example, a Hall element to a tension regulator that adjusts the tension applied to the tape 7, and the output from the tension addition detection section 8 is logically set as a tension value. It is supplied to the calculation unit 9. The logic operation unit 9 converts the rotation period of the tape supply reel detected by the supply reel rotation detection unit 3 to Ts. Letting the rotation period of the tape take-up reel detected by the take-up reel rotation detection unit 6 as TT, Ty" + Ts", T
A fuzzy logical operation is performed using the t/Tso value and the tape tension value detected by the tension addition detection section 8. This is generally the radius of the reel, the supply reel. Determine the running speed of the tape from the amount of each tape on the take-up reel and the thickness of the tape. The current tape remaining amount (current position) is determined as information for controlling tape running, but the tape running speed is used as an input value for fuzzy inference. 10T and 寞 are substituted, and the above-mentioned current remaining tape amount (current position) is substituted with the above-mentioned Tt/T*. Here, we will explain fuzzy inference using fuzzy theory. There are various fuzzy inference methods, but the method described below is an example of the most common MiniMaκ method. The rule is in the if-then format, for example, if the variable in the condition part is set to 2.
The number of variables in the conclusion section was set to one. There is no limit to this number, and the shape of the membership function representing the fuzzy set is trapezoidal (including triangles). Then, let the above two variables be x, y, and the fuzzy set for these variables X, y be A.
．． At. Let Bg be the fuzzy set C + of the conclusion part,
The following two rules were established in advance to obtain the output from Cz. if x=A. then u=C+
...-(Rule 1) if x=A. and y=
Bt then u=cz... (Rule 2) Fuzzy inference using these two rules proceeds as follows. First, let the input be X" The degree of fuzzy set A1 with respect to input x0 is α8, and in Rule 2, as shown in Figure 2 (b) and (c), the degree of fuzzy set A with respect to human power x0 is 8. The degree of fuzzy set B with respect to human power y0. becomes β. Then, for each rule above, take the minimum value and use it as the value that satisfies the rule. In this case, α8 for rule 1. β for rule 2,
becomes. Next, as shown by diagonal lines in FIGS. 2(d) and (e), the E notation values α8 and β. The fuzzy set C in the conclusion part, . C, and finally, as shown by diagonal lines in Figure 2 ('), take the logical sum α8+β8 of the cut conclusion parts for each rule above, and output, for example, the value u0 of the center of gravity. Based on such fuzzy logic, the tape drive control device according to the present invention provides a member symp function for the calculation results in the logical calculation section 9 as shown in FIGS. It was controlled using the following rules. Note that the rules shown in Table 1 are specific examples for fast forwarding, and are only one example. (Leaving space below) Table 1, that is, Figure 3 shows the member sinbu function for the tape running speed calculated by the above formula TTt+Tst. Mediu+m at intermediate speed
It is expressed by three types of fuzzy sets. Figure 4 shows the membership function for the tape amount for each reel, which is calculated by the ratio of the above calculation formula T t / T s, and shows the membership function for the tape amount for each reel.
all. Old G when there is a large amount of tape to be wound {Medi when the amount of tape being fed and the amount of tape being wound are approximately the same
It is expressed as three types of fuzzy sets: as. FIG. 5 shows the membership function for the tension value detected by the tension addition detection section 8, with Low when the tension value is low and 11i[! when the tension value is high. It is expressed using three types of fuzzy sets: h, Medium, and Medium. Furthermore, as for the voltage applied to the motor 2 or the motor 5 that is output based on these membership functions, the applied voltage is reduced as shown in FIG. ow
, increasing Ilight, applying the same voltage
It is expressed by three types of fuzzy sets of m. These are calculated based on rule (2) in Table 1 above,
For example, if the tension is the highest in Media, Tt” + Ts
” is Big and T./T. force < Medium, the old gh fuzzy set is selected as the applied voltage output, and the tension is Medium as shown in rule (3) of Table 1.
am, T1+T1 is l'lig, TT/TS is Bi
In the case of g, the Lo- fuzzy set is selected as the applied voltage output. Specifically, for example, when the tape speed shown in FIG. 3 is a, the degree to which the tape speed is Rig is 0.8 from the Big fuzzy set. Next, when the tape ratio between the supply reel and the take-up reel shown in FIG. 4 is a, the degree to which the tape specific force<Medium at this time is 0.6 due to the fuzzy set of Media+m. When the tensidin value detected by the tension addition detection section 8 shown in FIG. 5 is 7g, the degree to which the tensidin value (7g) at this time is Medtu+s is 0.6 according to the fuzzy set of MediaS. this is,
Since this corresponds to rule (2) in Table 1, the old gh fuzzy set is selected as the applied voltage output, and the old gh fuzzy set of the applied voltage shown in FIG. 6 is set to 0.6, which is the smallest of the above degrees. Cut with. Similarly, the fuzzy sets of Lo1 and Medius+ in the conclusion part shown in Fig. 6 are cut by the obtained minimum value, and the cut lli
For example, the center of gravity of the fuzzy set of gh, Low, Medicv+ is output as the applied voltage. In addition, as described above, by cutting each fuzzy set at the minimum value of the degree obtained above and outputting the center of gravity of these as an applied voltage, the above-mentioned feed reel rotation detection section 3. Take-up reel rotation detection section6. Since the detection error of the tension addition detection section 8 can be absorbed, the tape running can be controlled accurately even if a simple detection means is used.
The applied voltage determined by this calculation is supplied to the motor 2 in this case through the motor drive unit 1O, thereby controlling the rotational speed of the motor 2 and controlling the drive of the tape supply reel. It will be done. Note that during rewinding, the above voltage is applied to the motor 5. As is clear from the following explanation, the tape drive control device according to the present invention has the advantage of controlling the rotation periods T, , T. Detected by human power TT! +T
The tape running speed calculated using the formula Sg and the ratio of the tape amount on the supply reel 1 side and the 4 take-up reels calculated using the formula T r / T s. , the tension value applied to the tape 7 is determined, and by applying a voltage to the motor corresponding to the value of the lowest degree of each fuzzy set from these values, smooth acceleration and acceleration can be achieved without damaging the tape. It can decelerate and run the tape at an appropriate speed and tension. Although the above-mentioned embodiment has been described as an example in which the tape drive control device according to the present invention is applied to a video tape recorder, it may be applied to, for example, a case note tape recorder. Of course, it can also be used in open reel tape recorders, digital audio tape recorders (DAT), etc. [Effects of the Invention] The tape drive control device according to the present invention can fast-forward a tape. In a tape drive control device that performs rewinding,
The tape detected by the supply reel rotation detection means {'' (where T is the rotation period of the supply reel and T is the rotation period of the tape take-up reel detected by the take-up reel rotation detection means)
v"+T,", tape running speed calculated using the equation 1'T/Ts. By performing a fuzzy logic operation from the ratio of the tape supply amount to the winding amount and the tape tension detected by the tape tension addition detection means, and controlling the voltage applied to the motor that drives the reel based on the result of this operation, Even if a simple rotation detection means is used, the tape can be fast-forwarded and rewound with appropriate tape tension, resulting in smooth acceleration. The speed can be reduced and tape damage can be effectively prevented. 4,

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the tape drive control In device according to the present invention, Fig. 2 is a schematic diagram for explaining fuzzy inference, and Fig. 3 shows a membership function corresponding to the tape running speed. Figure 4 shows the membership function corresponding to the ratio of the tape supply amount and tape winding amount, Figure 5 shows the membership function of the tension value, and Figure 6 shows the membership function of the voltage applied to the motor. It is a diagram showing the membership function. !・・・・・・・・・(l Reel 2, 5...Motor 3...Iha feed reel rotation detection part 4...
・・・・・・・・・Take-up reel 6・・・・・・・・・
- Take-up reel rotation detection section 7...Tape 8...Tension addition detection section 9...
・・・・・・Logic operation section

Claims (2)

[Claims] (1) a supply reel rotation detection means for detecting the rotation of the tape supply reel; a take-up reel rotation detection means for detecting the rotation of the tape take-up reel; and a tape tension addition detection means for detecting the tension applied to the tape; a logic operation section that performs fuzzy logic operations using information from the supply reel rotation detection means, the take-up reel rotation detection means, and the tape tension addition detection means; and a motor that drives the tape supply reel and the tape take-up reel. and a motor drive section that drives a motor according to the output supplied from the logic operation section. (2) As an input value for the fuzzy inference in the logic operation unit, the rotation period of the tape supply reel supplied by the supply reel rotation detection means is T_S, and the rotation period of the tape take-up reel detected by the take-up reel rotation detection means is When the rotation period of is T_T, T_T^2+T_S^2,
2. The tape drive control device according to claim 1, wherein each value of T_T/T_S and the tape tension value detected by the tape tension addition detection means are used.