KR930008486Y1 - Tracking & viewing apparatus - Google Patents

Abstract

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Description

Tracking and Display

1 is a circuit diagram of a conventional tracking device.

2 is a circuit diagram of a tracking device of the present invention and a display device thereof.

* Explanation of symbols for main parts of the drawings

1: monostable multivibrator 2: phase control unit

11: up / down counter part 12: differentiator

AND ₁ : ANDGUIDE Q ₁ , Q ₂ , Q ₁₁ , Q ₁₂ : Transistor

OR ₁ : Oagate B ₁ -B _n : Buffer

CP ₁ -CP _n : Comparator SW ₁ -SW ₂ : Switch

LED ₁ -LED _n : Light Emitting Diode

The present invention relates to a tracking device of V-Cal which adjusts the phase of the capstan motor in order to obtain the best image quality during playback by performing relative adjustment between the tape and the image head. In particular, the adjustment range is wide and uniformly performed to track by the remote controller. This is possible, and relates to a tracking and its display device that can easily know the current tracking position.

In the conventional tracking device, as shown in FIG. 1, a circuit diagram thereof, the fixed terminals of the switches SW ₁ and SW ₂ commonly connected to the power supply terminal Vcc are connected to the transistors Q ₁ and Q ₂ . Respectively connected to the base, and the emitter and collector sides of these transistors Q ₁ and Q ₂ are commonly connected to the capacitor C ₁ , and the connection point is connected to the resistor R ₄ and the capacitor C ₂ smoothed. After the circuit was connected to the input terminal of the monostable multivibrator 1, its output terminal was connected to the input terminal of the phase control unit 2 so that the phase of the capstan motor was controlled by its output signal.

Referring to the conventional tracking device, when the switches SW ₁ and SW ₂ are shorted, the power supply of the power supply terminal Vcc passes through the resistor R ₁ to the base of the transistors Q ₁ and Q ₂ . When they are applied to one, is a capacitor (C ₁₎ by the transistor (Q ₁₎ is filled, it is a discharge by a transistor (Q _2).

And the terminal voltage of the switch _{(SW 1), (SW 2} ) short-circuited state is therefore subject to the control of the tracking control signal charge voltage level of the capacitor (C ₁₎ is changed in accordance with the tracking level, so that the capacitor (C ₁₎ of The period of the oscillation signal output from the monostable multivibrator 1 varies according to the level, and the phase control unit 2 controls the phase of the capstan motor by the oscillation signal so that the relative image of the tape and the image head is obtained. The position will be adjusted.

However, such a conventional tracking device does not perform tracking uniformly and tracks by using the charge voltage level of the capacitor, so that the adjustment range is narrow and reliability is deteriorated due to the change in capacity of the capacitor, aging, or leakage current.

Therefore, the present invention is designed to perform tracking uniformly, to increase the adjustment range, and to display the current tracking position so as to solve the above problem, which will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram of a tracking device and a display device according to the present invention. As shown therein, the fixed terminals of the tracking up and down instruction switches SW ₁ and SW ₂ controlled by the tracking control signal are AND gates. ₁₎ each connected to the base of the junction box and addition transistor (Q ₁₁₎ (Q ₁₂₎ to the input terminal, and a transistor (Q ₁₁₎ (interconnecting the emitter and collector of Q ₁₂₎ to the up / down the connection point While connecting to the input terminal of the counter 11, the reset terminal RS has an output terminal of the AND gate AND ₁ at one input terminal, and a power supply terminal Vcc at the other input terminal through a differentiator 12. the Iowa gate (OR ₁₎ output terminals for connection, and the resistance to the output terminal of the up / down counter 11 to the input terminal and the non-inverting input terminal of the monostable multivibrator (1) (R ₁₆₎ of which is connected , (R ₁₈ ), (R ₂₀ ),... , Comparators (CP ₁ ), (CP ₂ ), to which the reference voltage of the power supply terminal (Vcc) by (R _n +1) is applied. , (CP _n ) is connected to the inverting input terminal, and these output terminals are buffer (B ₁ ), (B ₂ ),. , (B _n ) through the light emitting diodes (LED ₁ ), (LED ₂ ),. , Connected to the (LED _n), and the stage output terminal of the stable multi-vibrator (1) to be configured by connecting to a phase control unit (2), wherein the up / down counter 11 has a low potential signal on its input terminal When applied, it is up counted, and when the signal of the intermediate potential is applied, it is maintained. It is down counted when the high potential signal is applied.

The operation and effects of the present invention configured as described above are as follows.

The high potential signal is output from the differentiator 12 at the beginning of the power supply of V-CAL and supplied to the power terminal Vcc, and is applied to the orate (OR ₁ ). Since the above signal is applied to the reset terminal RS of the up / down counter unit 11 and initialized, a signal having a predetermined level is output from the up / down counter unit 11, and the tracking up or down instruction switch is also used. _{(SW 1), (SW 2} ) are all even when short-circuit is applied to the high potential signal at the power supply terminal (Vcc) to the input terminal of the AND gate (AND ₁₎ is a high potential signal output from the AND gate (AND ₁₎ Iowa As a high potential signal is applied to the reset terminal RS of the up / down counter unit 11 as it is applied to the gate OR ₁ , a signal having a predetermined level is output from the up / down counter unit 11.

The tracking when only short-up switch for instruction (SW ₁₎ and a high potential signal at the power supply terminal (Vcc) is applied only to the base of the transistor (Q ₁₁₎ transistor (Q ₁₁₎ (Q ₁₂₎ is respectively turned on and off, up A high potential signal is applied to the input terminal of the / down counter section 11 to count down.

Therefore, while the switch SW ₁ is short-circuited, the output signal level of the up / down counter section 11 gradually decreases, and thus the period of the oscillation signal output from the monostable multivibrator 1 also changes. The phase control unit 2 controls the phase of the capstan motor and tracks it up, while comparators CP ₁ , CP ₂ ,. Since the level of the signal applied to the inverting input terminal of (CP _n ) is gradually lowered, the number of lit LEDs (LED ₁ -LED _n ) increases and the current tracking position is displayed.

On the other hand, when only the tracking down switch SW ₂ is shorted, the transistors Q ₁₁ and Q ₁₂ are turned off and on, respectively, and a low potential signal is applied to the input terminal of the up / down counter unit 11. Follow up. Therefore, while the switch SW ₂ is short-circuited, the output level of the up / down counter unit 11 gradually increases, and accordingly, the period of the power generation signal output from the monostable multivibrator 1 changes and is tracked down and the comparator ( Since the level of the signal applied to the inverting input terminal of CP ₁ -CP _n is gradually increased, the number of light emitting diodes (LED ₁ -LED _n ) to be turned on is reduced and the current tracking position is displayed.

In addition, when the tracking up / down indicating switches SW ₁ and SW ₂ are both open, the transistors Q ₁₁ and Q ₁₂ are all turned off, and the input terminal of the up / down counter section 11 has a medium potential. The signal is applied, and accordingly, the up / down counter unit 11 maintains the present state.

In addition, while the switches SW ₁ and SW ₂ are both short-circuited, the up / down counter unit 11 is maintained in an initial state as described above, and a signal having a level set therefrom is output. The tracking position is indicated by the light emitting diodes (LED ₁ -LED _n ).

As described above, the present invention, since the output signal level of the up / down counter unit changes uniformly, not only improves the reliability by enabling accurate tracking but also displays the current tracking position, and always shows the same tracking when watching a specific tape. Because it allows you to watch by location, it has the effect of providing convenience.

Claims (1)

Switches for tracking up / down switch for instruction (SW _1), short-circuit for generating a signal of a different level according to the short-circuit state of (SW ₂₎ detection means and a power supply initial or when the tracking up / down directions (SW ₁₎ , Reset generation means for generating a reset signal when (SW ₂ ) is all in a short circuit state, and a signal of a preset level reset and reset by the reset signal and down / down in accordance with the level of the short detection means; The up / down counter unit 11 which counts up and down / ups its output signal level, and the phase control unit 2 transmit a signal having a period proportional to that according to the output signal level of the up / down counter unit 11. A tracking device and a display device, comprising: a monostable multivibrator (1) to be applied; and display means for displaying the output signal level of the up / down counter unit (11) in comparison with a reference voltage.