JP2619887B2 - Magnetic tape playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape reproducing apparatus capable of displaying the position of a cue signal recorded on a magnetic tape.

2. Description of the Related Art Generally, dictation contents are recorded on a magnetic tape, and a dictation recording / reproducing apparatus used for writing the recorded contents while reproducing the recorded contents has a search signal (hereinafter referred to as a cue signal and a cue signal) at the beginning or end of the dictation contents. ) And a plurality of dictation contents recorded on the magnetic tape can be searched.

Conventionally, a current position of a magnetic tape is obtained from a cycle difference between a reel pulse from a supply reel of the magnetic tape and a reel pulse from a take-up reel, and a plurality of light emitting diodes (hereinafter, referred to as LEDs) are arranged in one row or two. Japanese Utility Model Publication No. Sho 58-34634 discloses a display device arranged in a line so that the current position of a magnetic tape or the position of a cue signal can be displayed by lighting or blinking.

[Problems to be Solved by the Invention] However, in the above-mentioned pergraph type display device,
Since the LEDs are arranged at intervals of one minute, it is necessary to arrange 30 LEDs in one or two rows based on a magnetic tape of 30 minutes each way. Further, in order to increase the resolution of the display device, the number of LEDs must be further increased. The use of such a pergraph-type display device requires a large amount of LEDs, complicates the configuration, cannot reduce the cost, and requires a large mounting space, thus reducing the size of the entire device. There is a problem that it cannot be achieved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and uses a small number of display elements to determine the current position of the tape and the first and second tapes.
A magnetic tape reproducing device that can simplify the configuration by displaying the relative relationship with the cue signal position by blinking, lighting, and extinguishing to reduce the cost and minimize the mounting space as much as possible. The purpose is to do.

[Means and Actions for Solving the Problems] The configuration of the present invention will be described with reference to FIG. The positions of the first cue signal and the second cue signal recorded on the magnetic tape are detected by the cue signal position detecting means 1 and stored in the storage means 2, and the current position of the magnetic tape is detected by the tape current position detecting means. Detect at 3. Next, the relative relationship between the first cue signal position and the second cue signal position stored in the storage means 2 and the current position of the magnetic tape detected by the tape current position detection means 3 is determined by a relative position detection means. The output is sent to the display signal generating means 5. The display signal generating means 5 generates a first display signal when a second cue signal exists between the current tape position and the next first cue signal, and generates a first display signal when the tape current position and the next first cue signal are present.
When the second cue signal does not exist between the first cue signal and the next cue signal and the second cue signal exists at a position exceeding the next first cue signal, a second display signal is generated. When the second cue signal does not exist at a position exceeding the third cue signal, a third display signal is generated. These display signals are sent to the display means 6 and displayed on display elements such as LEDs.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Second
FIG. 1 shows an example in which the present invention is applied to a dictation recording / reproducing apparatus and implemented using a microcomputer. In the figure
Reference numeral 11 denotes a tape cassette loaded in a cassette chamber of a dictation recording / reproducing apparatus (not shown). One reel driving mechanism for driving the take-up reel or the sending reel of the tape cassette 11 is provided with a reel pulse detector 12 for extracting a pulse signal proportional to the number of rotations. The reel pulse detector 12 used here has a disk 13 having a black and white pattern formed on the peripheral surface at the rotation center of the reel drive mechanism.
A photoelectric conversion element 14 that detects reflected light from a pattern and obtains a pulse signal is provided around 13. The electric signal of the photoelectric conversion element 14 is converted into a pulse signal by a reel pulse detection circuit 15 and then supplied to a microcomputer, for example, a central processing unit (CPU) 16.

Reference numeral 17 denotes, for example, recording and reproducing the dictation on the first track of the magnetic tape, a first cue signal for indicating the end of the letter on the second track, for example, an E mark, and a second for displaying the start of the instruction (INST) to the typist. , A 2-channel recording / reproducing magnetic head for recording / reproducing a cue signal such as an I mark. The E mark and the I mark recorded on the magnetic tape are read as electric signals by a magnetic head 17 and supplied to a CPU 16 via a cue signal detection circuit 18.

Reference numeral 19 denotes a switch for switching between forward and rewind of the apparatus main body, and a level corresponding to forward or reverse rotation of the reel drive mechanism is given to the CPU 16.

The CPU 16 processes the pulse signal from the reel pulse detection circuit 15 and the cue signal from the cue signal detection circuit 18 according to a program described later, converts the current tape position into time, and displays the time on the numerical display 20. further,
When there is an I mark between the current tape position and the next E mark (that is, when there is an instruction in the letter being typed), a first display signal is generated and the INST LED 21 is generated.
Flashes between the current tape position and the next E mark.
When the mark does not exist and the I mark exists at a position beyond the E mark (that is, when the currently typed letter has no instruction and there is an instruction after the next letter), a second display signal is generated and INST is generated. When the I mark is not present at a position beyond the current position of the tape (that is, when there is no instruction after the letter currently being typed), a third display signal is generated and the INST LED 21 is turned off. Control.

Next, the scanning operation of the CPU will be described with reference to the flowchart of FIG. The dictation recording / reproducing apparatus is loaded without rewinding the tape cassette on which the dictation content is recorded. Thereafter, when the scan is started by pressing the scan button (START), first, an I mark register [IMR] holding the reel pulses of the E mark registers [EMR (1) to EMR (F)] holding the E mark reel pulses. (1) -IMR (F)]
Is cleared, and then E holds the number of E marks.
I that holds the number register (ENR) and the number of I marks
The number register (INR) is set to 0. Subsequently, it is determined whether or not it is the tape end, and if not, it is determined whether or not the I mark has been detected. Here, if the I mark is detected, the INR is incremented by one. At this time, it is determined whether or not the INR has overflowed, that is, has become greater than 15. When the INR has overflowed, it is replaced with FH and held. Next, it is determined whether an E mark has been detected. The detection of the E mark is performed when the I mark is not detected and when the INR does not overflow. If the E mark is detected here, EN
Increment R by one. At this time, it is determined whether or not the ENR has overflowed. If the ENR has overflowed, it is replaced with FH and held. Subsequently, it is determined whether or not it is the tape end. This tape end determination is also made when the E mark is not detected and when the ENR does not overflow. The above processing is repeatedly performed until the tape end is detected. When the tape is finally rewound and the tape end is detected, the reel pulse counter (RPC) indicating the current tape position is set to zero.

Next, the INST / LED display routine of the CPU 16 during reproduction will be described with reference to the flowchart of FIG. When reproduction is started by pressing the reproduction button of the dictation recording / reproduction device (START), ENR is firstly replaced with a temporary register Y, and the total number of E marks is stored in the register Y. Then register Y
Is determined to be 0, and when the register Y is not 0,
RPC where the number of reel pulses of EMR (Y) indicates the current tape position
Is determined to be greater than the number of reel pulses. EMR
When it is determined that (Y) is small, the register Y is decremented by one and the process is repeated until the next E mark is detected with respect to the current position of the tape. At this time, if it is determined that the register Y is 0, that is, there is no E mark after the current position of the tape, a third display signal is generated and the INST LED 21 is turned off. On the other hand, if it is determined that the number of reel pulses of EMR (Y) is greater than the number of reel pulses of RPC indicating the current position of the tape, INR is replaced with a temporary register Z and the total number of I marks is stored in register Z. Subsequently, it is determined whether or not the register Z is 0.
It is determined whether or not the number of R (Z) reel pulses is greater than the number of RPC reel pulses indicating the current tape position. IMR
If it is determined that (Z) is small, the register Z is decremented by one and the process is repeated until the next I mark is detected with respect to the current position of the tape. At this time, if it is determined that the register Z is 0, that is, there is no I mark after the current tape position, a third display signal is generated and the INST LED 21 is turned off.

On the other hand, if it is determined that the number of reel pulses of IMR (Z) is larger than the number of reel pulses of RPC indicating the current position of the tape, it is determined whether the number of reel pulses of EMR (Y) is larger than the number of reel pulses of IMR (Z). Judge. At this time, if an I mark (second cue signal) exists between the current tape position and the next E mark (first cue signal), the EMR
(Y) is determined to be large, the first display signal is generated, and IN
Blink ST / LED21. Also, an I mark (a second cue signal) between the current tape position and the next E mark (a first cue signal).
Is not present, but an I mark (second cue signal) is present at a position beyond the next E mark, it is determined that EMR (Y) is small, and a second display signal is generated. Turn on the INST LED21.

FIG. 5 shows an interrupt routine that is generated each time the reel pulse falls. The interrupt routine is performed by temporarily suspending the work of the main routine. In this interrupt routine, when an interrupt process is performed, it is first determined whether or not a scan (SCAN) is being performed. Here, if it is determined that the scanning is not being performed, then it is determined whether the reel drive mechanism is rotating forward or reverse. When it is determined that the rotation is the normal rotation (reproduction mode), the reel pulse counter is incremented and the process returns to the main routine. When it is determined that the reel drive mechanism is in the reverse (rewind mode), the reel pulse counter is decremented and the process returns to the main routine. On the other hand, if it is determined that scanning is being performed, it is determined whether INR is 0 and I
If the mark has been detected, the register Z is set to 1.
Subsequently, IMR (Z) is incremented by one and the reel pulse is counted. Then, after adding 1 to the register Z,
Determine whether register Z is greater than INR. The above operation is repeated until the value of the register Z becomes larger than INR. Here, if it is determined that the register Z is large, EN
It is determined whether R is 0. The judgment of this ENR = 0? Is INR
Is also determined to be 0. If the E mark is detected, register Y is set to 1 and EMR (Y)
Is incremented by one. Then, after adding 1 to the register Y, it is determined whether or not the register Y is larger than ENR. The above operation is repeated until the register Y becomes larger than ENR. Here, if it is determined that the value of the register Y is large, or if it is determined that the above-mentioned ENR is 0, the interrupt routine is terminated and the process returns to the main routine.

According to this program, when the E mark and the I mark are recorded as shown in FIG. 6, the ENR counts up each time the E mark is detected by the scanning operation, and the EMR ( 1), EMR (2), E
A reel pulse is incremented at each address of MR (3). Similarly, every time the I mark is detected, the INR counts up, and the IMR (1), IMR specified by this INR
A reel pulse is incremented at each address of (2).

On the other hand, during playback, the reel pulse counter is incremented by an interrupt routine, and the current position of the tape is converted into time and displayed on the numerical display 20. At the same time IN
The ST / LED display routine detects the relative relationship between the current tape position and the E mark and I mark positions. At this time, when the magnetic head 17 is at the left end of the magnetic tape in FIG. 6, the first display signal is generated because the I mark IMR (2) exists between the current tape position and the next E mark EMR (3). Then the INST LED 21 blinks. And the magnetic head 17
Reaches the position of the I mark IMR (2), there is no I mark between the current tape position and the next E mark EMR (3), and the I mark IMR (2) exists behind the E mark EMR (3). Therefore, a second display signal is generated to turn on the INST LED 21. When the magnetic head 17 reaches the position of the E mark EMR (2), I is moved between the current tape position and the next E mark EMR (1).
Since the mark IMR (1) is present, a first display signal is generated and the INST LED 21 is made to blink. Magnetic head 17 is I mark I
When the position of MR (2) is reached, there is no I mark after the current position of the tape, so a third display signal is generated and the INST LED 21
Turn off the light. When the magnetic head 17 reaches the E mark EMR (1), there is no E mark after the current position of the tape.
Is continued, and the INST LED 21 is turned off.

Therefore, according to such a configuration, one INST · LE
By blinking, illuminating, and turning off D21, there is an instruction in the letter to be typed, there is no instruction in the letter you are typing, but there is an instruction in the subsequent letter, and then you type Since it is possible to know that there is no instruction in the letter, the typist can accurately grasp the instruction recorded on the magnetic tape and improve the work efficiency. In addition, the number of display elements such as LEDs is extremely small as compared to the conventional example, which is one, so that the structure can be simplified and the cost can be reduced, and the mounting space is small and the whole apparatus can be easily downsized. Can be planned.

In addition, by displaying the number of detected I marks and E marks, the remaining time until the next E mark, and the like on the numerical display 20, it becomes very convenient for deciding a concept of a type work procedure and a layout.

The present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the scope of the invention. For example, not only one LED 21 as a display element but a plurality of LEDs 21 may be provided according to the number of display signals. Further, the LED 21 may emit light of different colors according to the display signal.

[Effects of the Invention] According to the present invention, the relative relationship between the current tape position and the first and second cue signal positions is displayed using a small number of display elements, whereby the configuration can be simplified and the cost can be reduced. In addition, it is possible to provide a magnetic tape reproducing device capable of minimizing the entire holding device by minimizing the mounting space.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of the present invention, FIG. 2 is a block diagram showing a schematic configuration of an embodiment of the present invention, and FIGS. 3 to 5 are microcomputers used in the embodiment. FIG. 6 is an explanatory diagram for explaining the scanning and reproducing operation of the embodiment. 1 ... cue signal position detecting means 2 ... storage means 3 ... tape current position detecting means 4 ... relative position detecting means 5 ... display signal generating means 6 ... displaying means 11 ... tape cassette 12 ... Reel pulse detector 13 ... Disc, 14 ... Photoelectric conversion element 15 ... Reel pulse detection circuit 16 ... Central processing unit (CPU) 17 ... Magnetic head 18 ... Cue signal detection circuit 19 ... Switch, 20 …… Numerical display 21 …… INST ・ LED

Claims (1)

(57) [Claims] A first cue signal recorded on a magnetic tape; a cue signal position detecting means for detecting a position of a second cue signal different from the first cue signal; Storage means for storing the first and second cue signal positions; tape current position detection means for detecting the current position of the magnetic tape; and the first and second cue signal positions and the current position of the magnetic tape. A relative position detecting means for detecting a relative relationship; and a first display when a second cue signal exists between the current position of the magnetic tape and the next first cue signal based on an output of the relative position detecting means. A second cue signal is present between the current position of the magnetic tape and the next first cue signal but a second cue signal is present at a position beyond the next first cue signal. Is the second A display signal generating means for generating a display signal and generating a third display signal when the second cue signal does not exist at a position beyond the current position of the magnetic tape; and providing a display based on an output of the display signal generating means. A magnetic tape reproducing device comprising a display means.