JPS6319954B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention stores count data corresponding to a desired tape position in a storage circuit, and outputs a coincidence signal when the count data obtained as the tape runs matches the data stored in the storage circuit. The present invention relates to such a tape counter device. This type of tape counter device is used to select a desired song from a plurality of recorded contents on a magnetic tape, for example, a plurality of songs, or to repeatedly reproduce only that one song. In the case of this repeated playback, tape count data corresponding to the tape positions of the leading and trailing ends of a desired song are stored in advance, and when the magnetic tape reaches the trailing end position, the tape count data is stored in advance. Switching to the rewind mode, the tape is rewound, and when the tape reaches the leading edge position, the tape is switched to the playback mode, and this process is repeated. However, with such a conventional tape counter device, a portion of the beginning or end of a song may not be reproduced. This is because the operation shown in FIG. 1 is performed. That is, in FIG. 1, in order to repeatedly reproduce the recorded content R (shaded area) of the magnetic tape T, the count data n corresponding to the leading tape position of the recorded content R and the count data n corresponding to the trailing tape position are set. The count data m is stored in a storage circuit or the like. Now, if we run the magnetic tape in fast-forward mode or the like from the part before recorded content R, the count data will count up from a value smaller than n, as shown by arrow a, and then from n-1. Switch to n. At this switching point, the stored data n matches the actual count data, so a match signal is output, and the tape recorder is switched to the playback mode. Therefore, from the time when the count data switches from n-1 to n, the tape runs in the playback mode as shown by arrow b, the recorded content R is played back, and the count data changes from n to n. Count up sequentially. Next, when the end of the recorded content R approaches and the count data switches from m-1 to m, the count data m matches the stored data m, and a match signal is output. I end up. Since the tape recorder is controlled to switch to rewind mode by outputting this coincidence signal, the tape runs in the reverse direction as shown by arrow c even though the end of recorded content R such as a song has not been reached. , the count data is counted down sequentially. Therefore, the playback ends with the end portion of the recorded content missing, resulting in, for example, a so-called end-of-song condition. Furthermore, when the rewinding operation shown by arrow c above progresses and the count data approaches n, a match with the stored data n occurs when the count data switches from n+1 to n. Put it away. Therefore, even though the leading edge of the stored content R of the magnetic tape T has not been reached, the tape recorder is controlled to switch to the playback mode, the tape starts running in the forward direction as shown by arrow d, and the count data is will be uploaded sequentially. Therefore, playback is started with the leading end of the recorded content R being omitted, resulting in, for example, a state where the beginning of the song is cut off. The present invention has been made to eliminate such conventional drawbacks, and when tape count data is stored in advance and desired tape running control is performed, deletions at the leading and trailing ends of recorded content can be avoided. An object of the present invention is to provide a tape counter device that can perform playback without any trouble. Hereinafter, preferred embodiments of the present invention will be described.
This will be explained with reference to the drawings. FIG. 2 shows a block circuit diagram of an embodiment of the present invention, in which a magnetic tape is wound around a supply reel 1 and a take-up reel 2, such as a cassette tape. The rotation of at least one of these reels 1 and 2, for example the supply reel 1, is detected by a rotation detector 4. This can be easily done by, for example, attaching a rotating disk to the reel drive shaft that rotates the supply reel 1, providing magnetic poles at equal intervals along the circumferential direction of this rotating disk, and detecting these with a magnetic detection element. can be realized. The rotation detector 4 outputs a fixed number of rotation detection pulses each time the supply reel 1 rotates, and based on these rotation detection pulses, the counter circuit 5 outputs digital count data corresponding to tape running. It is sufficient for this counter circuit 5 to simply count pulses obtained by frequency-dividing the rotation detection pulse, but in addition to this, it can also calculate the reel rotation period from the rotation detection pulse and perform arithmetic processing etc. based on this rotation period. Alternatively, a device that outputs digital count data having a linear relationship with the amount of tape travel may be used. There is a one-to-one correspondence between the count value from the counter circuit 5 and the tape position, and the count value can be used to locate the beginning of recorded content on the tape or to repeatedly reproduce the content. The count output from the counter circuit 5 is converted by the decoder circuit 6 into a value suitable for display, such as the amount of tape travel or the remaining amount as a percentage of the total amount of tape, etc., and is sent to the display device 8 via the display drive circuit 7. . The display device 8 is a light emitting diode (LED)
For example, bar graph display or 7-segment numerical display is performed using a liquid crystal display (LCD) or the like. Further, the count data output from the counter circuit 5 is sent to at least two memory circuits 11 and 12, and these memory circuits 11 and 12 are configured to receive input data at that time according to a write pulse from the control circuit 10. The counted data is stored as is. The output data from these storage circuits 11 and 12 is sent to the coincidence detection circuit section 20 together with the count data. The control circuit 10 controls switching of the operation mode of the tape recorder in response to a coincidence signal from a coincidence detection circuit 20, which will be described later. This control circuit 10 controls various operations of the tape recorder, and basically responds to operation input when a mode selection button (not shown) provided on the operation surface of the tape recorder is pressed. The motor, plunger, etc. are controlled according to the selected mode (recording, playback,
Allows the tape recorder to perform operations (fast forward, rewind mode, etc.). In addition, in response to the memory set input, a write pulse is sent to the memory circuits 11 and 12, and the tape running direction is determined and an up/down switching signal for counting operation is sent to the counter circuit 5. Here, the tape running direction can be easily determined by, for example, distinguishing between the operation inputs for mode selection. For example, when recording, playback, or fast forward mode is selected, the up/down switching signal for the counting operation is It is sufficient to output "1", or "0" when the rewind mode is selected. This up/down switching signal is also sent to the coincidence detection circuit 20.
The control circuit 10 also outputs a display identification signal. This display identification signal is sent to one input terminal of a two-input AND circuit (AND gate) 13. The other input terminal 14 of the AND circuit 13 has
A periodic pulse signal for blinking is supplied,
When the display identification signal is "1", this blinking pulse is supplied to the display drive circuit 7 via the AND circuit 13. At this time, since the tape count display itself using the bar graph or 7 segments on the display device 8 blinks, other information can be displayed superimposed on this tape count display. Here, as the above-mentioned other information, information on a specific operation mode of the tape recorder can be used, such as a pause state, a recording state, a state where the tape end has been reached, or a state where the tape end is near (pre-end). The display identification signal may be set to "1" when detecting a state in which the tape is running in the opposite direction, a state in which the count data matches the output data from the storage circuit, or the like. Further, for displays other than such tape count display, various types of information may be discriminated by, for example, varying the blinking cycle. Next, the coincidence detection circuit section 20 detects each memory circuit 1.
This detects whether the data from 1 and 12 match the count data from the counter circuit 5, but it does not simply generate a match signal the moment these data match, as in the past. , depending on the running direction of the magnetic tape 3, a coincidence start time and a coincidence end time are selected from among the times when the respective data match, and a coincidence signal is generated at the selected time. Various circuit configurations are possible for this, but in this embodiment, an exclusive OR (hereinafter referred to as Ex.OR) circuit 21,
By using 22, 23, and 24, coincidence detection according to the tape running direction can be performed with a simple configuration. That is, in the coincidence detection circuit section 20 shown in FIG. The output data from the first storage circuit 11 is input to the other input, and the output data from the first storage circuit 11 is input to the other input of the Ex.OR circuit 22.
Output data from the storage circuits 12 of 1 and 2 are respectively supplied. Next, 2-input Ex.OR circuit 23,
24, one input of the Ex.OR circuit 23 is
Output data from the Ex.OR circuit 21 is supplied to one input of the Ex.OR circuit 24, and output data from the Ex.OR circuit 22 is supplied to one input of the Ex.OR circuit 24, respectively. Here, the up/down switching signal for the above counting operation from the control circuit 10 is supplied to the other input of the Ex.OR circuit 23, and a signal obtained by inverting this up/down switching signal by the inverter 27 is sent to the Ex.OR circuit. 2
4 to the other input. These Ex.
The outputs from the OR circuits 23 and 24 are respectively supplied to mono multi circuits 25 and 26 which are triggered at the rising edge of the signal, and the outputs from these mono multi circuits 25 and 26 are supplied to the coincidence detection circuit section 20. is sent to the control circuit 10 as a coincidence detection signal. To explain the operation of the coincidence detection circuit section 20 having the above configuration, first, the Ex.OR circuit generally consists of two
According to the inputs x and y, the output z appears as shown in Table 1.

[Table] As is clear from this first table, two inputs x, y
Only when they match, the output z becomes "0".
Therefore, the Ex.OR circuit 21 is the memory circuit 11
It becomes "0" only when the output data from the counter circuit 5 and the count data from the counter circuit 5 match.
Here, the above count data and the above output data are generally digital data of multiple bits (for example, k bits), and Ex.
Although an OR circuit 21 is provided, in order to simplify the explanation, only one Ex.OR circuit 2 is shown in FIG.
Only 1 is shown. In this case, for example, a total of k Ex.OR circuits are provided to perform Ex.OR for each corresponding digit (equal digit) of k bits of count data and output data, and these
By ORing all k bits of output from the Ex.OR circuit, the OR output becomes "0" only when the count data and output data match in all digits. This is the same for the Ex.OR circuit 22, and becomes "0" only when the output data from the storage circuit 12 and the above count data match. Now, as shown in FIG. 7, the count value corresponding to the leading edge position of the recorded content R on the magnetic tape T is n, the count value corresponding to the trailing edge position is m, and the leading edge count value n is stored in the storage circuit 11. The terminal count value m is stored in the storage circuit 12, respectively. This can be done, for example, by manually operating the first memory set button or the like (not shown) of the tape recorder at the beginning of the recorded content R as the tape runs.
Send a write pulse from 0 to the memory circuit 11, write the count value n at this time, and manually operate the second memory set button etc. (not shown) at the end position of the recorded content R to start the control circuit. 10 to the memory circuit 12 to write the count value m at this time. Next, looking at the operation when the above count data is n, we see that in the fast forward, playback, and recording modes when the tape is running in the forward direction (see Figure 3), and when the tape is running in the reverse direction. They differ from each other in the return mode (see FIG. 4). That is,
3A shows the count data from the counter circuit 5 during up-count operation, and FIG. 4 E shows the count data during down-count operation. As shown in FIGS. 3B and 4F, the above-mentioned OR output (at time) becomes "0" only when the count data matches the output data n from the storage circuit 11. Here, Ex.OR circuit 2
The up/down switching signal for the counting operation supplied to the other input of 3 is "1" when counting up and "0" when counting down, as described above. Now, if we consider the input y in Table 1 as this up/down switching signal, when the input y is "0", the input x appears as it is at the output z, whereas when the input y is "1", the input The inverted version of x appears at the output z. Therefore, FIG. 3B and FIG. 4F become one input x of the Ex.OR circuit 23.
The signal is inverted during up counting and becomes the third signal.
The signal shown in FIG. C is output, and the signal shown in FIG. 4 G is output as is when counting down. These outputs from Ex.OR circuit 23 are mono multi circuit 2
Sent to 5. Here, the mono multi circuit 25 is
Since it is triggered at the rising edge of the signal, when counting up in Figure 3, the count data is n-1.
It is triggered at the time when the value n of the output data of the memory circuit 11 changes from the value n to the value n of the output data of the memory circuit 11, that is, at the time when each data match starts, and outputs a pulse as shown in FIG. 3D. On the other hand, when counting down in Fig. 4, the count data changes from n to n.
-1, that is, at the end of the coincidence of the respective data, a pulse as shown in FIG. 4H is output. Next, the operation when the count data is m is performed in almost the same way, but after the up/down switching signal of the count operation is inverted by the inverter 27, it is sent to the other input of the Ex.OR circuit 24. When counting up (see Figure 5).
Then, the output from the Ex.OR circuit 22 (FIG. 5B) is directly output from the Ex.OR circuit 24 (FIG. 5C), and when counting down (see FIG. 6), Ex.
The output from the OR circuit 22 (FIG. 6F) is inverted and output from the Ex.OR circuit 24 (FIG. 6G).
Therefore, when the tape is running in the forward direction, the time point when the count data in FIG. At the end of the match, a pulse as shown in FIG. 5D is taken out as the match detection signal. When the tape is running in the opposite direction, the pulses match as shown in FIG. 6H at the point when the count data in FIG. A detection signal is obtained. Note that the switch 28 connected in parallel to the inverter 27 and controlled to change over to the side path can be used to, for example, use the storage circuit 12 to store the count value of the leading edge position of other recorded content when such repeated playback is not required. When you want to use it, it switches according to the signal from the control circuit 10 and makes the above side path conductive (ON).
It is something to control. When this switch 28 is switched and the above-mentioned bypass is turned on, Ex.OR circuit 2
Since the other input of No. 4 is supplied with a switching signal of "1" during up-counting and "0" during down-counting, it performs the same operation as Ex.OR circuit 23. Therefore, the memory circuit 12 can also be used for cueing the recorded contents. Next, the operation of the above-mentioned repeat playback will be explained with reference to FIG. 7 as well as its relationship with actual tape running. First, arrow a in FIG. 7 indicates the operation of switching the tape recorder to fast forward mode, etc., and searching for the beginning (leading edge) of the recorded content R. At this time, the tape running direction is the forward direction, so After the up-count operation is performed, from the above-mentioned figure 3,
At the time when the count data switches from n-1 to n, the coincidence signal shown in FIG. 3D is sent to the control circuit 10.
In the control circuit 10, the operation mode is switched to the reproduction mode in response to the coincidence signal shown in FIG. 3D. Therefore, the tape runs at a constant speed in the forward direction, the recorded content R is reproduced from the leading end, and the count data is sequentially incremented as shown by arrow b. Next, when the count data is near m, the coincidence signal shown in FIG. 5D is sent to the control circuit 10 at the time of switching from m to m+1 as shown in FIG. The control circuit 10 controls switching of the operation mode from the reproduction mode to the rewind mode in response to the coincidence signal shown in FIG. 5D. Therefore, reproduction continues even during the period when the count data is m, and the end portion of the recorded content R is also completely reproduced. Next, in the rewind mode, the tape runs in the reverse direction at high speed, and the counter circuit 5 performs a down-count operation as shown by arrow c in FIG. When the count data approaches n during this down-counting operation, the match signal H in FIG. 4 is sent to the control circuit 10 at the time of switching from n to n-1, as explained in conjunction with FIG. Therefore, the control circuit 10 controls the operation mode to be switched to the reproduction mode, and reproduction of the recorded content R is started without missing the leading edge. The count data at this time increases as shown by arrow d in FIG. 7, and the same operation as in the case of arrow b described above is performed. By the way, when the inverter 27 of the circuit shown in FIG. The corresponding parts have the same configuration. At this time, data m+1 is stored in the memory circuit 12.
By writing , a coincidence signal can be obtained when the count data switches from m to m+1 during up counting, and when the count data switches from m+1 to m during down counting, which is shown in Figure 5D. , is the same as the coincidence signal in FIG. 6H. That is, when the count value corresponding to the end position of the recorded content R on the magnetic tape T is m, by adding 1 to this value and storing the value m+1 in the storage circuit 12, the operation is completely equivalent to the coincidence detection operation for the leading end position. By the operation, matching signals corresponding to each position can be obtained, and repeated reproduction as shown in FIG. 7 can be performed. In this way, when using coincidence detection circuit sections having the same configuration for each storage circuit, the first
By using the seed storage circuit and the second type storage circuit that stores a value incremented by 1 or -1 to the count data, it is possible to repeatedly reproduce the data shown in FIG. Specifically, the case where the value obtained by adding 1 to the above count data is stored in the second storage means is as follows.
Data n is stored in the storage circuit 11 which is the first storage means, and data m+1 is stored in the storage circuit 12 which is the second storage means, thereby using the inverter 27 described above. It is possible to perform the repeated operation as shown in FIG. 7 without any trouble. Also, the value obtained by subtracting 1 from the above count data is
Specifically, in accordance with the above-described embodiment, the case where the data m is stored in the storage means is stored in the first storage means in correspondence with the storage circuit 12, and the data m is stored in the second storage means. The purpose is to store data n-1 in a certain memory circuit 11. This means that, for example, as an up/down switching signal from the control circuit 10, "0" is output when counting up, and "1" is output when counting down. It is assumed that the configuration without the inverter 27 of the present invention is applied to something like this. In this case, when counting up, the matching end point (the switching point from n-1 to n, m
The above match signal is obtained at the time of switching from m+1 to m+1), and the match signal is obtained at the start of match (m+1
Since the coincidence signal is obtained at the time of switching from n to n-1, and the time of switching from n to n-1, it is possible to perform the same repeated operation as in FIG. 7 described above. To summarize the operation when the inverter 27 is not used, the memory circuit 11 in the coincidence detection circuit 20
The operation of the circuit system from to mono multi circuit 25,
Since the operation of the circuit system from the memory circuit 12 to the mono-multi circuit 26 is performed in the same manner in binary logic, the memory value of either one of the memory circuits 11 and 12 is stored outside the area R. By shifting the tape count value, the repetitive operation shown in FIG. 7 is realized. That is, the coincidence detection circuit 20
As for the operation of each of the above-mentioned circuit systems, if the above-mentioned coincidence signal is obtained at the start of a match during up-counting, and a match signal is obtained at the end of matching during down-counting, data n is transferred to the memory circuit 11, and data n is transferred to the memory circuit 11. It is sufficient to store data m+1 in 12, and the output timing of the coincidence signal at this time is as follows.

[Table] becomes. In addition, as for the operation of each circuit system, if the coincidence signal is obtained at the end of the match during up-counting, and the match signal is obtained at the start of matching during down-counting, each memory value of each memory circuit 11, 12 It is clear that by setting n-1 and m to n-1 and m, respectively, the output timing of the coincidence signal becomes as shown in Table 3, and the operation is the same as in Table 2 above.

[Table] In addition, n-1→n in these Tables 2 and 3
etc., the count value from the counter circuit 5 is n
Of course, it also indicates the timing of switching from -1 to n. As is clear from the above description, the tape counter device according to the present invention includes a counter circuit 5 that performs an up/down count operation according to tape running, and a storage circuit that stores count data from the counter circuit 5. 11, 12, and among the times during which the count data from the counter circuit 5 and the output data from the storage circuits 11, 12 match, the matching start time and match end time are determined according to the tape running direction. a coincidence detection circuit section 20 that selects a coincidence signal and outputs a coincidence signal at the selected time point;
It is characterized by having the following. Therefore, for example, the memory circuits 11 and 12 have n,
When m is stored, n-1 as shown in FIG.
From the switching position between and n to the switching position between m and m+1 can be played repeatedly, and the recorded content R
For example, the beginning or end of a song can be played repeatedly without missing any part of the leading or trailing edge. Furthermore, complicated calculations using a microprocessor or the like are not required, the circuit can be easily constructed by combining logic circuits, and it can be supplied at low cost. Further, the tape counter device according to the present invention includes a first storage circuit that stores the count data from the counter circuit 5 as it is, and a second storage circuit that stores data that is increased by +1 or -1 from the count data. For example, since the configurations of the coincidence detection circuit sections subsequent to the first and second storage circuits can be made completely equal, the circuit configuration is simplified and is suitable for mass production. Further, according to the embodiment of the present invention, by supplying a blinking signal to the display drive circuit 7, the tape count display itself such as numbers on the display device 8 blinks, so that it is superimposed on the tape count display and other signals are displayed at the same time. For example, a pre-end display to warn that the end of the tape is near can be displayed, which increases the utilization efficiency of the display device 8 and eliminates the need to provide a separate display device for the other displays, which is economical. be. It should be noted that the present invention is not limited to the above-mentioned embodiments, and it is easy to increase the number of memory circuits and store count values corresponding to many locations on the magnetic tape, for example.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a repeat playback operation by a conventional tape counter device. 2 to 7 show an embodiment of the present invention, in which FIG. 2 is a block circuit diagram, FIG. 3 A to D, and FIG. 4 E.
-H, FIGS. 5A to D, and FIGS. 6E to H are time charts for explaining the operation, and FIG. 7 is a diagram for explaining the repeat playback operation. 4... Rotation detector, 5... Counter circuit, 7...
... Display drive circuit, 8 ... Display device, 10 ... Control circuit, 11, 12 ... Memory circuit, 20 ... Coincidence detection circuit section, 21, 22, 23, 24 ... Ex.OR
Circuit, 25, 26...Mono multi circuit, 27...
inverter.

Claims (1)

[Scope of Claims] 1. A counter circuit that performs a counting operation in accordance with tape running, a control circuit that outputs at least a write pulse and a tape running direction determination signal in accordance with a memory set input, and a control circuit that outputs at least a write pulse and a tape running direction determination signal in accordance with a memory set input, and a control circuit that outputs count data from the counter circuit. A memory circuit that stores data in response to write pulses from the control circuit, and a match start point and a match end time during which the output data from the recording circuit and the count data from the counter circuit match. A tape counter device comprising: a coincidence detection circuit that selects according to a tape running direction discrimination signal from the control circuit and outputs a coincidence signal at the selected time point. 2 The recording circuit includes a first memory circuit that stores the count data from the counter circuit when the write pulse is input as is, and a first memory circuit that stores data one count before or after the count data when the write pulse is input. 2. The tape counter device according to claim 1, further comprising a second memory circuit.