JPS6057151B2 - tape recorder tape counter device - Google Patents

Description

[Detailed Description of the Invention] This invention provides a tape recorder with a tape recorder.
・、1、Old 1-Month/Day 11' 112 I Kodo Hitoshi ι
The present invention relates to a tape counter device capable of displaying both running length and running time.

a first counter that counts the running length of the tape;
a second counter that counts pulses at a reference frequency;
A tape counter device having a display device that selects and displays one of the count outputs of these two counters has the advantage that it is possible to obtain information regarding the running length of the tape and information regarding the running time of the tape. It's convenient.

However, if you reset only one counter at the start of the counting operation, if you make the wrong selection, it will be necessary to hold the count and the counter will be reset. requires careful attention. SUMMARY OF THE INVENTION An object of the present invention is to provide a tape counter device that allows the user to select the counter to be reset without making a mistake when resetting one of the two counters.

In this invention, of the two counters, a reset command is given only to the force counter whose J count output is displayed on the display device. Therefore, if the reset operation is performed while looking at the contents displayed on the display device, there is no risk of making a mistake in selecting the desired counter, and there is also the advantage that it can be confirmed that the counter has been reset. Next, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a counter, Al2 indicates a counter B, and after one of them is selected by a selection circuit 3, each count number is sent to a display device via a wrap circuit 4, a gate circuit 5, and a decoder 6. supplied to 7,
Digital display is performed using a plurality of display elements 7a to 7d (four in the example). Tape pulses are supplied to the counter A1 via an inverter 8, a chattering prevention circuit 9, and a divider 10. This tape pulse consists of a series of pulse trains having a frequency corresponding to the running speed of the tape set in the tape recorder.For example, the tape pulse is passed from a light emitting element to a light receiving element through a slit provided in a disk that rotates with the reel shaft. It is obtained by converting an incident light pulse into an electrical pulse signal. Note that the divider 10 is for dividing the frequency of the tape pulse to obtain an appropriate frequency.
It can be omitted if the frequency of the tape pulse itself is an appropriate value. Also, the direction command to distinguish whether the tape running direction is forward or backward is issued by counter A.
Therefore, the counter A1 is given a value of D.1, depending on the content of this direction command (in this example, expressed as a difference in the levels of RH and RLJ). The tape pulse given from the binder 10 is counted up or down. The count number is then supplied to the selection circuit 3. On the other hand, counter B2 performs an operation of counting the number of pulses of a pulse signal having a constant reference frequency. Therefore, the number of counts corresponds to time.

In this example, as a means of obtaining a reference frequency signal pulse,
After taking out the frequency of 50 Hz (or 60 Hz) of the commercial power supply through the chattering prevention circuit 11, first, it is divided into 115- (or 116) by the divider 12,
Furthermore, a circuit is provided which generates a 1 Hz pulse by dividing the frequency by a divider 13 to 1110. If necessary, divider 1 can also be used to accommodate 64Hz AC input obtained by dividing the oscillation signal from the crystal.
2 and 13 have a function of frequency-dividing the input signal into 118, respectively, and selection of this frequency division ratio is achieved by supplying a control signal to the dividers 12 and 13 from a control circuit 14 operated by a frequency selection signal. It is carried out at the same time. In addition, in order to obtain an operation in which the output of the divider 12 is supplied to the divider 13 only for the necessary time, the output of the divider 12 is used as the first input, and the start L command supplied via the chattering prevention circuit 15 is used as the second input. An AND gate 16 is provided as an input. The start command is a signal that is at the RHJ level only while the tape is running at a constant speed during recording or playback, or only while a push button is pressed to obtain the stopwatch function,
Only while this start command is at the RHJ level, the divider 12
The output of is input to the divider 13. Counter A1 is
For example, it is a W-adic counter that counts from 0 to 9999, and the counted number is supplied to the selection circuit 3, and a carry is taken out to the outside as necessary.

Further, the counter B2 is a four-digit ω-adic counter that counts input pulses of 1 Hz, counts from 0 to 5959, and supplies the counted number to the selection circuit 3. An example of a specific circuit configuration of the selection circuit 3 is shown in FIG.

In this example, the selection circuit 3 includes a first select gate 3a connected to each output terminal of the counter A1, and a second select gate 3b connected to each output terminal of the counter B2, Each output terminal of the first select gate 3a is connected to one output terminal of the second select gate 3b, and a large number of connection points formed here are connected to a plurality of latch elements constituting the wrap circuit 4. It is connected to one L input of 4a. In addition, the RHJ or RLJ level display selection command generated by operating a changeover switch (not shown) is directly sent to the control terminal of the first select gate 3a, and is sent to the control terminal of the second select gate 3b. They are each supplied via an inverter 3c. Therefore, when the display selection command is at the RLJ level, all the second select gates 3b are closed, but the first select gate 3a is opened, so that only the output of the counter A1 is transmitted to each latch element 4a of the wrap circuit 4. supplied to Further, when the display selection command reaches the RH level, the first select gate 3a closes and the second select gate 3b opens in its place, so that only the output of the counter B2 is supplied to each latch element 4a. This provides an operation of selecting only one of the outputs of counter A1 and counter B2. Furthermore, each latch element 4a of the wrap circuit 4, when the level of the wrap command accepted at its φ input is RH, outputs the input accepted at the L input as is as the Q output, but the level of the wrap command is lower than RHJ. When the state changes to RLJ, an operation is performed to output the L input at the time of this change to the Q output.

Therefore counter A1 and/or counter B2
Even if the count operation is progressing, the wrap command is RLJ
The count number when the level is reached is supplied to the gate circuit 5. This wrap command is given as a pulse obtained by operating a suitable operating member (not shown), as shown in FIG. 18 to invert it. Due to this inversion, the level of the n output becomes RLJ, and this RLJ level signal is given to the wrap circuit 4 as a wrap command, and the wrap circuit 4 performs a wrap operation. When the operating member is operated again, a pulse is supplied to the T-flip-flop 18 to invert it, and as a result of this inversion, the level of the O output is increased to HJ, and the wrap operation of the wrap circuit 4 is canceled. Further, the T-flip-flop 18 is reset by applying a pulse sent from the selection circuit 3 to the reset terminal as a reset signal via the 0R gate 19 when the display selection command is switched, and thereby the wrap circuit 4 is performing a wrap operation, the wrap operation is canceled. The output of the selection circuit 3 is divided into multiple digits (in this example, 4 digits, each digit consisting of a 4-bit binary code) indicating the count number of counter A1 or counter B2. The output is supplied to the decoder 6 and at the same time to the gate circuit 5, where a zero subless signal is generated.

This zero subless signal is transmitted to the decoder 6 through the 0R gate 21. In the gate circuit 5, the counter A1
When counter B2 is selected, if the content is other than zero, a zero subless signal is generated that erases the zeros in the most significant digit, and when counter B2 is selected, a zero subless signal is generated that erases only the zeros in the most significant digit. . Each decoder 6 decodes the input 4-bit binary code according to a predetermined method, and displays only the segments required to display a desired number on the corresponding display elements 7a to 7d. Provides a signal to emit light. As a result, the display device 7 digitally displays numbers from 0 to 9999 when the count number of counter A1 is selected, and numbers from 0 to 5959 when the count number of counter B2 is selected. be done. Note that when the zero subre signal is input, the output of the decoder 6 is turned off and the display on the display device 7 disappears. The blanking command is applied to the decoder 6 through the inverter 20 and the 0R gate 21, and is used to turn off the output, thereby erasing all the display on the display device 7. Further, a gate circuit 22 is provided to obtain a function of resetting either or both of the counter A1 and the counter B2.

This gate circuit 22 is composed of AND gates 23 and 24, 0R gates 25 and 26, and an inverter 27, and one input terminal of the N1 gates 23 and 24 receives a reset command, and the other input terminal receives a reset command. are respectively supplied with the above-mentioned display selection command. This display selection command changes the count number of counter A1 at the RL level.
Also, in order to control the selection circuit 3 so that the count number of the counter B2 is displayed when the RH level is reached,
It is supplied as is to one AND gate 24, but the inverter 2 is supplied to the other AND gate 23.
7. Therefore, when a reset command (consisting of one pulse) is supplied to the gate circuit 22 by operating an operating member (not shown) such as a pushbutton, this reset command is If the selection command is at RL level, it passes through AND gate 23 and 0R gate 25 and is added to the reset input of counter A1 and divider 10, and if the display selection command is at RHJ level, it is applied to AND gate 24 and 0R gate 26. It is passed through and applied to the reset input of counter B2. When the display selection command is at the RLJ level, the count number of the counter A1 is displayed on the display device 7, and when the display selection command is at the RHJ level, the count number of the counter B2 is displayed. Therefore, the reset command resets only the counter A1 or the counter B2, which is supplying the count number to the display device 7 at that time, and does not reset the other counter. Note that 0
The R gates 25 and 26 use a pulse generated by the reset circuit 28 when the power is turned on as a reset signal to control the counter A.
1. It is provided to supply the reset input of the divider 10 and the counter B2, and can be omitted.

Note that the reset signal is also supplied to the 0R gate 19 along with the reset command, and is also used to reset the T-flip-flop 18. Furthermore, a detection circuit 29 is provided to provide end detection functions for detecting when the tape has finished running to the end, and position detection functions for rewinding the tape until a predetermined position is detected.

This detection circuit 29 has a timer that performs a timer operation based on a constant frequency reference signal obtained from the divider 12, and this timer is cleared every time a tape pulse is supplied. Therefore, when the tape stops running and tape pulses are no longer supplied, the timer starts operating from this point on, and output is generated when the set time has elapsed. This output is supplied to a driver 32 via a timer 31, and this driver 3
The output of 2 is taken externally to drive a relay that shuts off the tape recorder mechanism. After the timer 31 is supplied with the output from the detection circuit 29,
Time required for relay to operate! (For example 200~
400rr1sec) to continue the operation of the driver 32. The detection circuit 29 also has a function of accepting a signal from the counter A1 indicating that the count number has reached RO, and providing an output to the timer 31 if the level of the memory command is RHJ at this time.

This function is used as automatic position detection to reset the counter A1 at any position on the tape, rewind from another position, and stop at the initial position. Note that this operation is not performed if the memory command is at the RLJ level. As described above, in the tape counter device of the present invention, only the counter selected in response to the display selection command is reset.

That is, when a reset operation is performed and a reset command is given, only the counter whose count is displayed on the display device is reset, and the other counter is not reset. Therefore, it is possible to reliably prevent the inconvenience of erroneously selecting the counter to be reset, and it is also possible to confirm that the counter has been reset.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of a tape counter device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a part thereof in detail. 1...Counter Al2...Counter Bl3
...Selection circuit, 4...Wrap circuit, 5...
...Gate circuit, 7...Display device, 7a-7
d...display element, 22...gate circuit, 29...detection circuit, 31...timer, 32...driver.

Claims (1)

[Claims] 1 A first counter that counts up or down tape pulses according to the running direction of the tape, and a first counter that counts up or down tape pulses according to the running direction of the tape;
a second counter that counts independently of the counter; a selection circuit that selects either the count output of the first counter or the second counter in response to a display selection command; and an output of the selection circuit. a display device that displays a reset input of the first counter when a reset command is given from the outside and the display selection command selects the count output of the first counter; A tape counter device for a tape recorder, comprising a gate circuit that supplies the reset command to each reset input of the second counter when the command is to select the count output of the second counter.