JPS6149750B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape counter device installed in a tape recorder, and more particularly to a tape counter device that can display the running length and running time of a tape.

A tape having a first counter that counts the running length of the tape, a second counter that counts pulses of a reference frequency, and a display device that selects and displays one of the count outputs of these two counters. The counter device is useful in that it can provide information regarding the running length of the tape and information regarding the running time of the tape. However, this information is generally displayed digitally as a four-digit number, and the lowest digit changes quickly, making it difficult to read the displayed number accurately for record-keeping purposes. It's not easy.

An object of the present invention is to display the count output of a first counter or a second counter selected by a selection circuit on a display device in normal use, and to provide a lap command generated when an external operation member is operated. In such a case, a tape counter device is provided which makes it easy to read the displayed number at a desired point in time by memorizing and retaining the count number when this wrap command is given and displaying that value on a display device. It is to provide.

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 indicates counter A, and reference numeral 2 indicates counter B. After one of them is selected by a selection circuit 3, the respective count numbers are passed through a wrap circuit 4, a gate circuit 5, and a decoder 6. The information is supplied to the display device 7 and digitally displayed by a plurality of (four in this example) display elements 7a to 7d.

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, and can be omitted if the frequency of the tape pulse itself is an appropriate value. Further, a direction command is given to the counter A1 to distinguish whether the running direction of the tape is the forward direction or the reverse direction.
is the content of this direction command (in this example, "H",
The tape pulse applied from the divider 10 is counted up or down depending on the difference in the level of "L". The count number is then supplied to the selection circuit 3.

On the other hand, the counter B2 performs an operation of counting the number of pulses of a pulse signal having a constant reference frequency, and therefore, the counted number corresponds to time. In this example, the means to obtain the reference frequency signal pulse is 50Hz (or 60Hz) from the commercial power supply.
Hz) is extracted through the chattering prevention circuit 11, and then first divided into 1/5 by the divider 12.
(or 1/6), and then use divider 13 to divide the frequency into 1/6.
A circuit is provided which generates a 1 Hz pulse by dividing the frequency by 10. If necessary, the dividers 12 and 13 each have a function of dividing the input signal to 1/8 so that it can also correspond to a 64Hz AC input obtained by dividing the oscillation signal from the crystal. This frequency division ratio selection is performed by supplying control signals to the dividers 12 and 13 from a control circuit 14 operated by a frequency selection signal. 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 command supplied via the chattering prevention circuit 15 is used as the second input. An AND gate 16 is provided as an input. For example, the start command is issued only while the tape is running at a constant speed during recording or playback.
Or, it is a signal that goes to "H" level only while the push button is pressed to obtain the stopwatch function, and this start command is "H" level.
Only during the level, the output of divider 12 is changed to divider 1.
3 is input.

The counter A1 is a decimal counter that counts, for example, from 0 to 9999, and the counted number is supplied to the selection circuit 3, and the carry is taken out to the outside as necessary. Also counter B2
is a 4-digit sexagesimal 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 selects the counter A
1, 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 the numerous connection points formed here are connected to one L input of a plurality of latch elements 4a constituting the wrap circuit 4. There is. In addition, the "H" or "L" level display selection command generated by the operation of a changeover switch (not shown) is sent to the control terminal of the first select gate 3a as is, and to the second select gate 3a.
are supplied to control terminals of select gates 3b through inverters 3c, respectively. Therefore, when the display selection command is at the "L" level, all the second select gates 3b are closed, but the first select gate 3a is open, so only the output of the counter A1 is applied to each latch of the wrap circuit 4. It is supplied to element 4a. Further, when the display selection command becomes "H" level, the first select gate 3a closes and the second select gate 3a closes.
b is open, so only the output of 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 "H", outputs the input accepted at the L input as is as the Q output, but the level of the wrap command is "H". When the level changes from "H" to "L", an operation is performed to output the L input at the time of this change to the Q output.
Therefore, even if the counting operation of counter A1 and/or counter B2 is in progress, the count number when the wrap command reaches the "L" level is supplied to gate circuit 5. This lap directive is
For example, when the user wants to record the number of counters A1 or B2 displayed on the display device 7, the user operates an external operation member (not shown) to stop the change in the number of counters displayed on the display device 7. Sometimes it is given as a pulse, and this pulse passes through the chattering prevention circuit 17 and then
- applied to flip-flop 18 to invert it; This inversion causes the output level to become "L", and this "L" level signal is given to the wrap circuit 4 as a wrap command, and the wrap circuit 4 performs a wrap operation. When the external operating member (not shown) is operated again, a pulse is supplied to the T-flip-flop 18 to invert it, and this inversion causes the output level to become "H".
The wrap operation of the wrap circuit 4 is released. Also T
- The flip-flop 18 receives a pulse sent from the selection circuit 3 when the display selection command is switched.
It is reset by being applied as a reset signal to the reset terminal via the OR gate 19, thereby canceling the wrap operation if the wrap circuit 4 is performing a wrap operation.

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 suppress signal is generated. This zero suppression signal is transmitted to the decoder 6 through the OR gate 21. In the gate circuit 5, when the counter A1 is selected, if the content is other than zero, a zero suppress signal is sent to erase the zero in the most significant digit, and when counter B2 is selected, the zero in only the most significant digit is generated. Creates a zero suppression signal that disappears. Each decoder 6 receives the input 4
The bit binary code is decoded according to a predetermined method, and the corresponding display elements 7a to 7d are
A signal is provided to cause only the segments needed to display the desired digits 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. In addition, if a zero suppress signal is included, the decoder 6
The output of is turned off, and the display on the display device 7 disappears.
Also, the blanking command is applied to the inverter 20 and
applied to the decoder 6 through the OR gate 21,
This is for turning off all the display on the display device 7 by turning off the output.

Furthermore, a gate circuit 22 is provided to obtain a function of resetting one or both of counter A1 and counter B2. This gate circuit 22 includes AND gates 23 and 24
, OR gates 25 and 26, and inverter 2
7, AND gates 23, 24
A reset command is supplied to one input terminal of the , and the above-mentioned display selection command is supplied to the other input terminal. This display selection command indicates the count number of counter A1 when it is at the "L" level, and when it is at the "H" level.
This is to control the selection circuit 3 so that the count number of the counter B2 is displayed respectively when the level is high, and it is supplied as is to one AND gate 24, but the inverter 27 is supplied to the other AND gate 23. Supplied via. Therefore, when a reset command (consisting of one pulse) is supplied to the gate circuit 22 by operating an external operating member (not shown) such as a pushbutton, this reset command is If the display selection command is “L” level, AND gate 23 and OR
It passes through gate 25 and is applied to the reset input of counter A1 and divider 10, and if the display selection command is at the "H" level, it passes through AND gate 24 and OR gate 26 and is applied to the reset input of counter B2. Display selection command is “L”
When the level is high, the count number of the counter A1 is displayed on the display device 7, and when the level is "H", the count number of the counter B2 is displayed. Therefore, the reset command is sent to the display device 7 at that time.
Only counter A1 or counter B2, which supplies the count number to the counter A1 or counter B2, is reset, and the other one is not reset.

Note that the OR gates 25 and 26 are provided to supply the pulses generated by the reset circuit 28 when the power is turned on as a reset signal to the reset inputs of the counter A1, the divider 10, and the counter B2, and can be omitted. It is.
Note that the reset signal is ORed with the reset command.
Also supplied to gate 19 and used to reset 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 fed through a timer 31 to a driver 32 whose output is taken externally to drive a relay that shuts off the tape recorder mechanism. The timer 31 functions to continue the operation of the driver 32 for the time required for the relay to operate (for example, 200 to 400 msec) after the output is supplied from the detection circuit 29.

The detection circuit 29 also has a function of accepting a signal from the counter A1 indicating that the count number has reached "0" and providing an output to the timer 31 if the level of the memory command is "H" at this time. There is. 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 "L" level.

As described above, according to the present invention, no matter which count output of the two counters is selected by the selection circuit, when a wrap command is given to the wrap circuit by the operation of an external operating member, the count output is determined by the count output. is stored in the wrap circuit, and the count stored in the wrap circuit is displayed on the display device until the wrap command is canceled by operating the external operating member again. Even if the counter number is changing in a short period, the displayed number can be stopped changing at any time according to the user's needs, and the number can be easily read. This effect can be obtained.

[Brief explanation of the drawing]

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 A, 2...Counter B, 3...
Selection circuit, 4...Lap circuit, 5...Gate circuit, 7...Display device, 7a to 7d...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 second counter that counts reference frequency signal pulses independently of the first counter. a counter, a selection circuit that selects and outputs one of the count outputs of the first counter and the second counter, a display device that displays the output of the selection circuit, and the selection circuit and the display device. When a wrap command generated when an external operating member is operated, the count output of the first or second counter supplied through the selection circuit is stored and held, and the value is displayed above. A tape counter device for a tape recorder, comprising a lap circuit supplying the device.