JPS6052945A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To assure the program searching action in a rewind mode and to improve the operability of a magnetic recording/reproducing device, by traversing quickly for several seconds when a program searching command of the signal of the rewinding direction is sent within a fixed count value from the head of the signal, then changing the quick traverse mode to the rewind mode again. CONSTITUTION:The output of a signal detecting circuit 3 is set at L when a tape driver 1 is set under a reproduction mode with absence of signals. When a signal is detected, the output of the circuit 3 is changed to H. Then the 1st counting means 6 starts its counting action by means of the 1st discriminating means 5 since the output of a reproduction state memory means 4 is H. The 2nd discriminating means 8 sends a quick traverse command to a mechanism control part 2 when a switch 7 is turned on repetitively before the counted value of the means 6 reaches a fixed level. At the same time, the 2nd counting means 9 starts its counting action. A quick traverse mode is kept until the counted value of the means 9 reaches a fixed level, and a rewind command is sent to a control part 2. The driver 1 is set under a rewind mode, and the signal head is detected by the circuit 3. Thus the program searching action is assured in a rewind mode and the operability is improved for a magnetic recording/ reproducing device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device having a signal cueing function.

Conventional configurations and their problems In recent years, various cueing mechanisms and various configurations for ensuring their reliability have been proposed for magnetic recording and reproducing apparatuses. For example, when rewinding and searching for the beginning of a signal, if the signal is rewound near the beginning, the time required for detection is short, so the signal detection circuit cannot detect it and passes through it. One way to prevent this is to prohibit the input that changes the operation of the tape transport device at the beginning of the signal after a certain period of time has passed in the playback state. This has drawbacks such as the user may keep pressing the operation button without realizing that the button is being pressed, and it is inconvenient because the operation input cannot be accepted until a certain period of time has elapsed.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a magnetic recording and reproducing device that ensures cueing in a rewinding state and improves user operability.

Structure of the Invention The present invention includes a signal detection circuit and a first counting means that starts counting after detecting the beginning of a signal in a reproduction state, and before the counted value reaches a certain value, a signal is sent to the tape running device. When a command to cue is given in the rewinding state, the second determining means causes the tape running device to go into the fast forward state once, and the second counting means starts counting, and the counted value is set to a certain constant value. When the rewind state is reached, the signal detecting circuit automatically detects the beginning of the signal, and in a magnetic recording/reproducing apparatus having an absolute address cueing method, the present address and the next cue are detected. The first step is to remember the address. By providing a second storage means and a third determination means for determining the size of these addresses, a switch (hereinafter referred to as a next address transition switch) for moving to the next address in the middle of the current address is provided. ) is closed, it is configured to determine whether the current address is after or the same as the next address to cue, and perform the operation to enter the fast forward and rewind state. The present invention provides a magnetic recording and reproducing device that improves operability by ensuring the beginning of a direction and eliminating the state in which operation input is prohibited until several seconds after the beginning of a signal.

DESCRIPTION OF EMBODIMENTS FIG. 1 is a block diagram of an embodiment of the present invention.
1 is a tape running device, 2 is a mechanism control unit, and when there is an input to R, F, and P, the tape running device 1 is rewinded, fast forwarded, or replayed, respectively. 03 is a signal detection circuit that is L'' when there is no signal.

When a signal is detected, an output of "H" is generated. 4 is a playback state storage unit that stores that the tape running device 1 is in a playback state, and 6 is a unit that determines that it is in a playback state when the beginning of the signal is detected. 7 is a repeat switch for rewinding the signal from the middle and reproducing it from the beginning again;
Reference numeral 8 denotes a second discrimination means which discriminates the output of the first counting means 6 and the state of the repeat switch and gives a command for fast forwarding or rewinding to the mechanism control section; 9 indicates fast forwarding by the second discrimination means 8; A second counting means starts counting as soon as the state is reached, and gives a rewind command to the mechanism control unit 2 when the counted value reaches a certain value, 1o is a first storage means for storing the current address, 11 is the next one. A second storage means 12 for storing the address to cue to next compares the current address and the address to cue next, and when the current address is greater than or equal to the address to cue next, it outputs H' 13 is a next address transition switch for moving from the middle of the current address to the next address to be cued;
At this time, the second determining means 8 is the first counting means 6. 129 is a block diagram of an implementation array configured using a ficrocomputer in Oi2 which discriminates the state of the third determination means 129 next address transition switch and gives a fast forward or rewind command to the mechanism control unit 2, The microcomputer 15 performs various processes using the output of the signal detection circuit 3 shown in FIG. 1, the repeat switch 7, and the next address shift switch 13 as inputs. The microcomputer 15 includes functions such as the first to third discrimination means, the first to third counting means, and the storage means shown in FIG. It is a diagram.

FIG. 4 is a timing chart showing the signals on the magnetic tape and the corresponding operations of the respective parts of the first magnetic tape.

The operation of this embodiment with the above configuration will be described in detail below.

First, when the tape running device 1 is in the playback state and there is no signal,
The output of the signal detection circuit 3 becomes L'', and the first counting means 6 is reset.Next, when a signal is detected in the reproducing state at time t1 in FIG.
Since the output of the reproduction state storage means 4 is "H", the first determination means 5 performs step 16 in FIG.
18, the process reaches step 19, and the first counting means 6 starts counting. When the switch 7 is repeatedly turned on before the counted value reaches a certain value (for example, at time t2 in FIG. 4), the second determination means 8 causes the process to proceed to step 22.23 via steps 20 and 21, and the mechanism control section 2
A fast forward command is given to the second counting means 9, and at the same time the second counting means 9 starts counting. Until the counted value reaches a certain value (
At time t3), the fast-forward state continues, and at time t5, a rewind command is automatically given to the mechanism control unit 2 (steps 24 and 25), and the tape running device 1
enters a rewinding state, and furthermore, at time t6, the beginning of the signal is detected by the signal detection circuit 3.

Next, after the first counting means 6 reaches a certain value (time t
Thereafter, for example, at time 15), turn on switch 7 repeatedly.
Then, the second determining means 8 determines this and performs step 20.
21 and 26, a rewinding command is given to the mechanism control unit 2, and the tape running device enters a direct rewinding state, and at time t6, the signal detection circuit 3 detects the beginning of the signal. The constant value of the first counting means, which is the boundary between fast forwarding and rewinding, is determined to correspond to the time t4 at which the tape travels to a position where the beginning of the signal can be sufficiently detected even if the tape is directly rewinded. The second part that determines the fast forwarding time
The constant value of the counting means shall also be determined to correspond to the time taken to rapidly advance to the same position. As described above, the cue can be reliably found even if the switch is repeatedly turned on at any position of the signal.

Next, if the absolute address cueing function is provided, when the next address transition switch 13 is turned on, the third determination means 12 determines that the current address storage means 10 and the storage means 11 of the address to be cued next are Compare each memory value and if the current address is greater than or equal to the next address to cue (for example, the current address is 3 and the next address to cue is 1)
That is, only when the address to be searched next is in the rewinding direction, the second determining means 8 performs the same operation as when the above-described repeat switch 7 is turned on through steps 26 and 27.

As described above, according to the configuration of the above embodiment, when a cue command in the rewinding direction is given near the beginning of a signal, if the rewinding is continued as is, the signal detection circuit 3 may not be able to detect the beginning of the signal. However, the first determining means 6. The first counting means 6 counts the position from the beginning of the signal, and the second determining means determines the counted value to a certain constant value (the counted value corresponding to the position where the beginning can be detected by direct rewinding). If the speed has not reached the predetermined time, the signal detecting circuit 3 can detect the beginning of the signal again by entering the fast-forward state, counting the fast-forward time by the second counting means 9, and automatically entering the rewind state after a certain period of time. This makes it possible to ensure cueing in the rewinding direction.

Effects of the Invention According to the present invention, a signal detection circuit, a first counting means,
a first determining means that determines that the playback state is in progress when the beginning of the signal is detected and gives a counting start command to the first counting means; a second determining means that determines that the numerical value has not reached a certain constant value and issues a fast-forwarding command; and a second determining means that starts counting after the second determining means enters the fast-forwarding state and the counted value is a certain constant value. By providing a second counting means that violates the rewinding command when the signal reaches the beginning, the rewinding command is fast-forwarded for a certain period of time in response to the cueing command in the rewinding direction within a few seconds from the beginning of the signal. can be detected reliably, ensuring cueing in the rewinding direction, and not prohibiting operation input within a few seconds from the beginning of the signal, compared to the conventional example (
The operability can be improved compared to the conventional magnetic recording apparatus, and an excellent effect can be obtained in a magnetic recording/reproducing apparatus having a repeat playback function or an absolute number position type cueing function.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a main block diagram of an embodiment of the invention using a microcomputer, and Fig. 3 is a 70-chart diagram showing the control procedure of the microcomputer. , FIG. 4 is a timing chart showing the operation of each part in FIG. 1. DESCRIPTION OF SYMBOLS 1... Tape running device, 2... Mechanism control section, 3... Signal detection circuit, 4...
. . . Reproduction state storage unit, 5 . . . First determining means, 6 . . . First counting means, 7 . . . 2. Discrimination means, 9. River.
Second counting means, 1o...Current address storage means,
11...Memorization means for the address to cue next, 1
2...Third determination means, 13...Next address transition switch. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Figure 3 Factor 4 Figure 71-

Claims (3)

[Claims] (1) A signal detection circuit that generates an output for discriminating between a signal part and a non-signal part recorded on a magnetic tape, a first counting means, and a tape running device when the signal detection circuit detects the beginning of a signal. and a first determining means that determines that the is in the reproducing state and gives a command to the first counting means to start counting, and when the counted value of the first counting means is within a certain value, the rewinding direction 1. A magnetic recording and reproducing device comprising control means for fast forwarding for several seconds and then rewinding when a command to cue a signal is given. (2) The control means discriminates between the output of the switch for giving a cue command of a signal in the rewinding direction and the count value of the first counting means, and gives a command for fast forwarding or rewinding to the tape running device. It is characterized by being composed of a second determining means, and a second counting means that starts counting after the tape running device enters the fast forward state by the second determining means and gives a rewind command after 1 to 2 seconds. A magnetic recording/reproducing device according to claim 1. (3) a signal detection circuit that emits an output for discriminating between a signal portion and a non-signal portion recorded on the magnetic tape; a first counting means; and a tape running device that operates when the signal detection circuit detects the beginning of the signal. a first determining means that determines that the tape is in a playback state and gives a command to the first counting means to start counting; and a first storage means that stores data corresponding to a position from the beginning of the tape as a current address. , a second storage means for storing the address at which the cue is to be searched; a third determining means for determining the magnitude of the numerical value stored in the second storage means; and when the current address is after or equal to the address to be cued next, from the middle of the current address to the address to be cued next; a switch for shifting, and a second determining means that determines the output of this switch, the count value of the first counting means, and the output of the third determining means, and gives a command for fast forwarding or rewinding to the tape running device. When the count value of the first counting means is within a certain value and a command to cue the current address or an address before the current address is given, a signal is sent as a rewind state after fast forwarding for several seconds. A magnetic recording/reproducing device characterized by detecting the beginning of a .