JPH0448455A - Jog device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for controlling playback at an arbitrary speed by rotating a dial when controlling playback at an arbitrary speed installed in a magnetic tape recording/reproducing device, an optical disk reproducing device, etc. The present invention relates to a jog device.

A conventional jog device detects the rotational speed of a dial based on two pieces of information: the rotational direction and the rotational pulse. For speed detection,
A common method is to calculate the rotational speed from the number of rotational pulses resulting from rotation of a dial for a certain period of time, and a common method for detecting the rotational direction is from the phase difference between two rotational pulses. In this method, if the rotation direction is reversed within a certain period of time during which rotation pulses are counted (hereinafter referred to as sampling time), the rotation speed is calculated from the rotation pulses in both forward and reverse directions, and the rotation speed is calculated at that moment. The calculated rotational speed is different from the rotational speed of the dial. This is not a problem if the sampling time is short, but if the sampling time is shortened, the period of rotation pulses is large when manually rotating the dial, so almost no pulses are input within the sampling time, making it difficult to calculate the rotation speed. As a result, a good operational feeling cannot be obtained.

In view of this, an object of the present invention is to provide a jog device that has a good operational feel and can obtain a rotational speed that follows the rotational operation of a dial without shortening the sampling time.

Means for Solving the Problems In order to achieve the above object, the jog device of the present invention includes a dial that generates rotation pulses by rotation operation, a unit time for counting the rotation pulses, and a dial rotation speed based on the counted rotation pulses. A clock circuit that generates a timing pulse to start the calculation, a pulse count circuit that counts rotation pulses for a certain period of time using the timing pulse from the clock circuit, a rotation direction detection circuit that detects the rotation direction of the dial, and a rotation direction detection circuit that detects the rotation direction of the dial. A reversal detection circuit that detects a reversal of direction, a speed calculation circuit that calculates the rotation speed of the dial based on information from the pulse count circuit and direction detection circuit, and a reset circuit that resets the pulse count circuit when the rotation direction of the dial is reversed. According to the present invention, with the above configuration, the responsiveness when the rotation of the dial is reversed is improved without shortening the sampling time, and since the sampling time is not shortened, it is possible to improve the response to variations in rotation. This eliminates the need for loss of stability and improves the operational feel of the jog device, such as responsiveness and followability during reversal.

Embodiment Hereinafter, the structure of a magnetic tape recording and reproducing apparatus equipped with a jog device according to an embodiment of the present invention will be explained with reference to FIG.

1 is a dial equipped with a circuit that generates rotational pulses by rotational operation. Reference numeral 2 denotes a clock circuit that generates a timing pulse for determining the sampling time for counting the rotation pulses from the dial 1 and the timing for calculating the rotation speed from the counted rotation pulses. 3
is a pulse counting circuit that counts rotational pulses from the dial 1 in synchronization with timing pulses from the clock circuit 2. Reference numeral 4 denotes a reversal detection circuit that detects that the rotation direction has been reversed and resets the pulse count circuit 3. 6 is a rotation direction detection circuit that detects the rotation direction of the dial 1. Reference numeral 6 denotes a speed calculation circuit that calculates the rotational speed of the dial from the number of rotational pulses counted by the pulse counting circuit 2 in synchronization with the clock circuit 1 and the rotational direction information from the rotational direction detection circuit 5. Reference numeral 7 denotes a control circuit that controls the reproduction speed of the magnetic tape based on the rotational speed of the dial calculated by the speed calculation circuit 6. Reference numeral 8 denotes a reproducing circuit that controls reproducing the magnetic tape based on commands from the control circuit 7.

Regarding the jog device of the magnetic tape recording and reproducing device configured as described above, the operation is divided into two cases: when the dial is rotated in a fixed direction and when the dial is operated including reversing the rotation direction. Explain.

First, when the dial 1 is rotated in a fixed direction as shown in FIG. Information on the number of rotation pulses counted during the period) is sent. At this time, the pulse count circuit 3 is reset and starts counting again. The speed calculation circuit 6 calculates the rotation speed of the dial 1 from the number of rotation pulses and the rotation direction information from the rotation direction detection circuit 5, and sends the information on the rotation speed of the dial to the control circuit 7. The information on the rotational speed at this time also includes information on the rotational direction. The control circuit 7 instructs the reproducing circuit 8 to reproduce the magnetic tape at a speed corresponding to the rotational speed of the dial. The reproducing circuit 8 reproduces the magnetic tape at the commanded speed.

Next, in a case that includes a rotation operation in the opposite direction as shown in Figure 2, if the direction of the rotation operation of the dial 1 is reversed within the sampling time, the reversal detection circuit 4 detects the reversal, and the pulse count circuit 3 is activated. Reset. The pulse count circuit 3 resumes counting pulses from the reset point, that is, the point at which the dial 1 detects reversal. Then, the rotational speed of the dial 1 is calculated from the number of rotational pulses after inversion by the timing pulse from the clock circuit 2 in the same manner as in the case of rotation in a fixed direction, and the reproduction control of the magnetic tape is performed.

According to this embodiment, it is possible to improve the responsiveness when reversing the dial without shortening the sampling time, and since the sampling time is sufficient, stability during rotation operation in a fixed direction is not impaired. Therefore, the operability as a jog device is improved.

In this embodiment, the magnetic tape recording/playback device is equipped with a jog device, but all devices that control the playback speed of audio and video, such as optical disc players and audio/video digital memory players, are equipped with operation input devices. It is possible to mount the jog device of the present invention as a.

Effects of the Invention As is clear from the above explanation, according to the present invention, it is possible to improve the responsiveness and followability when the rotational direction of the dial is reversed, without impairing the stability during rotation of the dial. , the operability of the jog device is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a jog device in an embodiment of the present invention, and FIG. 2 is a timing chart for explaining a processing method of the Jeddah device in the embodiment. 1...Dial, 2...Clock circuit,
3... Pulse count circuit, 4... Reversal detection circuit, 6... Rotation direction detection circuit, 6...
... Speed calculation circuit, 7 ... Control circuit, 8.
...Regeneration circuit. Name of agent: Patent attorney Shigetaka Awano and 1 other person 2nd
Figure 1 of the rotation juice of the constant direction Ran 1st party rotation hole 1st division pN friend 1st bunch

Claims (1)

[Claims] A dial that generates rotation pulses by rotation operation, a unit time for counting rotation pulses, a clock circuit that generates timing pulses for starting calculation of dial rotation speed from the counted rotation pulses, and timing from the clock circuit. A pulse count circuit that counts rotation pulses for a certain period of time, a rotation direction detection circuit that detects the rotation direction of the dial, a reversal detection circuit that detects the reversal of the rotation direction, and a pulse count circuit and rotation direction detection circuit. A jog device comprising: a speed calculation circuit that calculates the rotational speed of the dial based on the information; and a reset means that resets the pulse count circuit when the rotational direction of the dial is reversed.