JPS6235155Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used for electronic editing of PCM-recorded magnetic tapes, and relates to a recording machine tracking device that adjusts each magnetic tape so that the editing points of each magnetic tape coincide. be.

A conventional adjusting device for a recorder will be explained with reference to FIG.

In the figure, 1a is a first recorder, 1b is a second recorder, and by changing the frequency of the input signal sent to the first electric motor 2a and the second electric motor 2b, respectively, The running speed of the first recording medium 3a and the second recording medium 3b formed of magnetic tape can be changed according to the frequency of the input signal.

Note that the first and second recording media 3a and 3b contain PCM recorded information (for example, music information).
At the same time, a time code (address code) indicating the recording position is modulated and recorded at the same time interval (same interval).

Reference numeral 4 denotes a reference oscillator, which is connected to the input of the first motor 2a of the first recorder 1a, and generates a constant speed signal of the reference frequency to rotate the first motor 2a at a constant speed. One recording medium 3a is run at a reference speed.

5 is a detector, and the first and second recorders 1a
and 1b, respectively, and detect the time codes reproduced and output from the first and second recording media 3a and 3b, respectively, and calculate the difference code values between the detected time codes and the preset edit point time code. At the same time, the difference between the two difference code values, that is, the relative difference code value is calculated, and this relative difference is output as a start/run difference signal. Note that this detector 5
is constituted by reference numerals 6 to 8, which will be explained next.

6a and 6b are the first and second recorders 1a and 1
first and second demodulators which demodulate the modulated time code reproduced and output from b and output a time code (so-called address code); 7a is a first difference device; 7b is a second difference device; , the first and second time code values output from the first and second demodulators 6a and 6b, respectively, and the first and second edit point time code values (edit point address) that are preset, respectively. ) and outputs the difference code values. That is, the number of time codes (number of time bits) from the current time code to the editing point on each magnetic tape 3a, 3b is output.

8 is a comparator, and a first and second difference device 7a
and 7b are compared, and the difference, that is, the relative difference code value, is sent out as a start/run difference signal.

A converter 9 is connected to the output of the comparator 8 and converts the input timing difference signal into a frequency corresponding to the relative difference code value and its polarity, and sends it out as a shift signal.

10 is PLL (Phase Locked Loop),
Compares the reference frequency of the reference oscillator 4 with the frequency of the deviation signal input from the converter 9, and sends a speed change signal with a frequency increased or decreased from the reference frequency according to the frequency difference and the polarity to the second electric motor 2b. do.

The conventional tracking device of a recorder is configured as described above, and the number of time codes (first difference code value) up to the first editing point of the first magnetic tape 3a is
and the number of time codes (second difference code value) up to the second editing point of the second magnetic tape 3b, and if there is a difference between the two, the detector 5 detects this. and sends out a start/run difference signal according to the difference.

This start-up difference signal is converted by the converter 9 to a frequency corresponding to its code value and polarity, and the PLL 10 sends out a shift signal converted to this frequency.

As a result, the PLL 10 sends out a speed change signal of a frequency corresponding to the frequency indicated by the deviation signal from the reference frequency to the second electric motor 2b, and drives the second magnetic tape 3b.
is accelerated or decelerated so that the number of time codes up to the first editing point is equal to the number of time codes up to the second editing point, that is, the number of time codes up to the second editing point is made equal.

However, in the conventional converter 9 and PLL 10, when the amount of out-of-alignment, that is, the relative difference code value in the comparator 8 increases, the linearity of the correlation between the out-of-alignment signal and the deviation frequency is lost, resulting in an error. As a result, there is an upper limit and a lower limit in the start-up range, and a defect occurs in which the second magnetic tape 3b is not accelerated or decelerated by the required amount, making the start-up operation impossible. Furthermore, when the ambient temperature changes, the characteristics change, making the running operation unstable and causing a problem in which it is impossible to maintain an accurate running state.

In order to eliminate these defects in the conventional tracking device of a recorder, various changes have been made to the design method, such as changing the PLL 10 to a voltage-to-frequency (V-F) conversion method, but none of them yielded significant results. However, it has become impossible to manufacture a tuning device that can maintain accurate tuning operation.

As mentioned above, the conventional tracking device for recorders uses a converter and PLL to shift the frequency of the speed change signal sent to the electric motor that runs the recording medium, so it is difficult to manufacture and If the speed difference between them exceeds the allowable range, not only will it be impossible to perform a synchronization operation, but the characteristics will change due to temperature, making the synchronization unstable. The drawback was that it was not possible to maintain stable conditions.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional tracking device of a recorder. By installing an oscillator and controlling the running speed of the recording medium in stages, it is easy to manufacture, there is no limit to the inability to keep track, the characteristics do not change due to temperature changes, and it is easy to maintain stability between multiple recording devices. The purpose of the present invention is to provide a racing device that can maintain racing motion.

An embodiment of this invention will be described below with reference to FIG.

In the figure, 1 to 8 are the same as the conventional symbols. 11 is an acceleration oscillator that sends out an acceleration signal with a frequency higher than the reference frequency, and 12 is a deceleration oscillator that sends out a deceleration signal with a frequency lower than the reference frequency.

13 is a changeover switch, and the input side of this changeover switch 13 is provided with a constant speed terminal, an acceleration terminal, and a deceleration terminal, which are connected to the outputs of the reference oscillator 4, acceleration oscillator 11, and deceleration oscillator 12, respectively;
The output terminal on the output side is connected to the input of the second electric motor 2b.

The output terminal of this changeover switch 13 is normally connected to a constant speed terminal, and a constant speed signal having the same reference frequency as that of the first electric motor 2a is normally sent to the second electric motor 2b.

Reference numeral 14 denotes a converter which selects and selects the switching of the changeover switch 13 according to the difference code value and its polarity of the adjustment difference signal (relative difference code value) output from the comparator 8 of the detector 5. The time is calculated and the switching signal is output to the changeover switch 13.

In the above configuration, when the running state is maintained at all times, a constant speed signal with the same reference frequency is sent to the first and second electric motors 2a and 2b, and the first and second magnetic Tapes 3a and 3b are run at a constant speed. In this case, the relative difference code output from the comparator 8 is "zero". In such a state, when a relative difference code is detected from the comparator 8, that is, an out-of-sync state is detected between both magnetic tapes 3a and 3b, the converter 14 converts the code value of the investigation scanning signal input from the comparator 9. and outputs a switching signal according to the polarity. This switching signal causes the changeover switch 13 to be switched, and the start-up operation is started.

That is, when the difference code output of the second difference device 7b is larger than the difference code output of the first difference device 7a, the changeover switch 13 is switched to the acceleration oscillator 11 side, and the running speed of the second magnetic tape 3b is changed. If the changeover switch 13 is switched to the deceleration oscillator 12 side and the second magnetic tape 3b is increased.
Decrease the running speed of the vehicle. The acceleration or deceleration period, that is, the switching period of the changeover switch 13, is calculated by the converter 9 from the relative difference code value of the adjustment/running difference signal from the comparator 8, and the changeover switch 13 is thereby controlled.

In this way, the acceleration and deceleration oscillator 1 whose frequency differs from the reference frequency by the deviation frequency necessary for start-up is used.
1 and 12 and simply by switching them, it is possible to eliminate the drawback that the conventional tuning device is unable to perform a tuning operation when the amount of tuning deviation between both magnetic tapes 3a and 3b exceeds the allowable range. , it is possible to respond to a wide range of start and run differences.

In addition, this racing device eliminates the drawback of the conventional racing device that the racing operation becomes unstable when the temperature changes, and improves it so that it can maintain stable racing operation even when the temperature changes. I can do things.

In the above embodiment, frequency was used as the running control signal for the recording medium, but voltage, current, pulse signals, etc. may also be used for control, and the number of switching settings is not limited to three levels. ,
5 stages (acceleration 1. acceleration 2. constant speed, deceleration 1. deceleration 2), etc.
Furthermore, it may be divided into multiple stages.

This invention provides acceleration and deceleration signal generators in addition to the constant speed signal generator as described above, and uses a converter to switch the changeover switch when the detector detects that both recording media are out of alignment. Since both recording media are synchronized, it is possible to provide a synchronization device that is easily manufactured and can easily maintain stable synchronization operation between a plurality of recorders.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing the configuration of a conventional timing device for a recorder, and FIG. 2 is a connection diagram showing the configuration of an embodiment of this invention. In the figure, 1 is a recorder, 2 is a motor, 3 is a recording medium, 4 is a reference oscillator, 5 is a detector, 11 is an acceleration oscillator, 12 is a deceleration oscillator, 13 is a changeover switch, and 14 is a converter. . In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Utility Model Registration Claim] Time codes (address codes) recorded on a plurality of moving recording media are detected, and settings are set in advance corresponding to each of the detected time codes and each of the recording media. In addition to calculating the differences with the time code (edit point), the relative differences between these differences are also calculated, and the running speed of each of the recording media is controlled according to each of these relative difference values, so that each of the above relative differences is calculated. In a recording device tracking device that controls the value to be zero, an acceleration signal generator, a constant speed signal generator, and a deceleration signal generator each generate control signals for accelerating, constant speed, and decelerating the recording medium. Recording characterized in that the running speed of each of the recording media is switched and controlled in stages by selecting the signal generator according to each of the relative difference values and outputting a control signal thereof. Machine control device.