JP3341499B2 - Tape media playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape media device such as an audio device or a video device, and more particularly to a counter device.
Media playback of a tape-shaped recording medium provided with a data means
It concerns the device .

[0002]

2. Description of the Related Art Conventionally, a tape media device using a tape-shaped recording medium such as an audio device or a video device is provided with a counter device for detecting the rotation of a tape reel. Such a counter device is provided with, for example, a reflective portion and a non-reflective portion on a reel base of a tape reel, and irradiates the reel base with light from a rotation detector such as a photo-reflector when the reel base is rotated. The rotation detector continuously detects the reflected light reflected by and outputs a detection signal. When the rise or fall of the detection signal is used as a trigger, the counter is incremented when the reel base is rotating in the forward direction (playback, fast-forward direction), and the reel base is moved in the reverse direction (rewind direction). ), The counter is controlled to count down.

[0003]

By the way, the above-described counter device is undetected or erroneously detected due to rising or falling of a detection signal detected by a rotation detector such as a photoreflector for some reason. Or, a counter error occurs in the counter, for example, when the reel base moves when the counting operation of the counter is stopped, and it is difficult to compensate for the count error.

Therefore, in order to prevent the count deviation of the counter due to the non-detection or erroneous detection, it is necessary to always operate a rotation detector such as a photoreflector to detect a detection signal. Could not do.

Further, when the reel base rotates in an arbitrary direction (for example, a forward direction such as tape reproduction or fast-forward), the counter is counted up by a rising or falling of a detection signal as a trigger. Even if it rotates temporarily in the reverse direction (for example, rewind direction) due to the cause, the counter is counted up by recognizing rotation in the forward direction (tape playback, fast-forward direction), and an error occurs in the counter value. There was also.

[0006]

The present invention SUMMARY OF] has been made in view of such problems, on the rotation of the tape reel base
It is detected by a counter consisting of m bits and lower n bits.
To the tape media playback device for the tape-shaped recording medium
Phase difference based on the rotation of the tape reel base.
N rotation detection means for outputting a rotation signal, and n rotation detection means.
The detection signal output from the output means is a predetermined n-bit
Data conversion means for converting the data into
Based on the change in the n-bit count data
Control of the upper m bits of the counter
Count control means, and the lower n bits of the counter
Is the n-bit count data converted by the data conversion means.
Data is substituted.

Further, the upper m bits of the counter
Control of the count is performed based on the n-bit first count data.
Performed when the second count data of the bit changes
You .

Also, the upper m bits of the counter
Control of the count is performed based on the n-bit first count data.
When the bit count changes to the second count data, the upper m
The bit count is incremented and a second count of n bits
Changed from data to n-bit first count data
Sometimes the upper m bits count is done to decrease
You.

[0009]

According to the present invention, the n rotation detection signals detected from the reel base by the rotation detecting means are quantified and substituted into the lower n bits of the counter means. By increasing / decreasing the value, high-precision counter means with a small counting error can be provided.
It can be tape media playback equipment realization of the tape-shaped recording medium having.

[0010] Even if the rotation detection signal detected by the rotation detector or the like is not detected or is erroneously detected, the combination of the previous n-bit data and the current n-bit data causes the (n + 1) th bit or more of the counter means to be detected. Is increased or decreased, the counting error is compensated, and the counting error of the counter means can be almost eliminated. Further, the n-bit data supplied at the start of counting by the counter means and the n-bit data stored at the memory when the counting is stopped are started.
By comparing the bit data with the bit data, it is possible to detect the deviation of the counter value caused by the deviation of the reel base when the counter means stops counting. In this case, a count error can be prevented by adjusting the count value.

[0011]

FIG. 1 shows a tape recording medium according to an embodiment of the present invention.
FIG. 2 shows an example of a block diagram of a counter device used in a body tape media playback device . In this figure, reference numeral 1 denotes a reel base provided in a tape media reproducing device ( not shown), for example, in which reflective portions 1a and non-reflective portions 1b are alternately formed at intervals of 60 °. 2 (2a, 2
b) is a rotation detector such as a photo reflector,
Each of the reel bases 1 is irradiated with light to detect reflected light from the reel base 1, and outputs a rotation detection signal. Reference numeral 3 denotes a waveform / numerical converter, which converts the rotation detection signals output from the rotation detectors 2a and 2b into binary numbers 1/0 and outputs them.

Reference numeral 4 denotes a data converter, which converts the numerical value converted by the waveform / numerical value converter 3 into predetermined 2-bit data. Reference numeral 5 denotes a 16-bit counter, and the lower 2 bits include 2-bit data (b ₁ ,
b ₂ ) is provided. Reference numeral 6 denotes a counter controller, which increases or decreases the value of the counter 5 by 3 bits or more based on the 2-bit data supplied from the data converter 4.

Reference numeral 7 denotes a nonvolatile memory, and a counter 5
2-bit data (b _1E ,
b _2E ) is stored. _{Reference numeral 8} denotes a comparator for comparing 2-bit data (b _1S , b _2S ) supplied at the start of counting by the counter 5 with 2-bit data (b _1E , b _2E ) stored in the memory 7. 3 shows a counter controller that increases or decreases the value of three bits or more of the counter 5 according to the comparison result of the comparator 8. Each part surrounded by a chain line portion 10 is a microcomputer 10 of a tape media reproducing device (not shown).
It is provided inside.

Hereinafter, the operation of the counter device of this embodiment will be described in detail. When the reel base 1 is rotating, the rotation detectors 2a and 2b irradiate the reel base 1 with light, detect reflected light reflected by the reflecting portion 1a formed on the reel base 1, and continuously rotate. Outputs a detection signal. That is, when the reel base 1 rotates in the direction of the arrow shown in FIG.
Reference numerals a and 2b alternately detect a reflection portion and a non-reflection portion, and continuously output a rotation detection signal as shown in FIG.
At this time, the rotation detectors 2a, 2a,
2b is arranged with respect to the reel base 1.

Then, the rotation detector 2a as described above,
The rotation detection signal output from 2b is a waveform / numerical converter 3
Are converted into binary numerical values 1/0 as shown in FIG. 2B in accordance with High / Low of the waveform.

By the way, the waveform / numerical converter 3
When the two rotation detection signals quantified in the above are combined into 2-bit data, when the reel base 1 is rotated in the direction of the arrow, the 2-bit data becomes "00" → "01" →
“11” → “10” → “00” →..., That is, when converted to a decimal number, “0” → “1” → “3” → “2” →
It changes from “0” to. For this reason, the rotation detection signal that changes in this way is defined as 2-bit data.
As it is, it cannot be used by substituting into the lower 2 bits of the counter 5.

The rotation detection signal digitized by the waveform / numerical converter 3 is converted by the data converter 4 into "00" → "00", "01" → "01", "11" as shown in FIG. →
"10", "10" is converted to "11". As a result, the counter 5 receives the rotation detection signals detected by the rotation detectors 2a and 2b, and outputs "00" → "01" → "10" →
2-bit data (b ₁ , b ₂ ) that changes from “11” → “00” →... Is supplied. In other words, when converted to decimal, "0" → "1" → "2" → "3" →
Data that changes from “0” to... Will be supplied.

The 2-bit data (b ₁ , b
₂ ) is substituted into the lower 2 bits of the 16-bit counter 5 and is also supplied to the counter controller 6. When the reel base 1 is rotating in the forward direction (playback or fast-forward direction), the counter controller 6 controls the counter when the 2-bit data sequentially supplied from the data converter 4 changes from "11" to "00". The counter 5 functions as a 16-bit counter by incrementing the third bit or more of the fifth bit.

Here, the counter controller 6 converts the 2-bit data (b ₁ , b ₂ ) to “11” as shown in FIG.
→ Not only when it changes to “00”, but also “10” → “0”
When the value changes from "0", "11" to "01", the value of the third bit or more of the counter 5 is incremented.

This is because the 2-bit data sequentially supplied from the data converter 4 increments the value of the third bit or more of the counter 5 from "11" to "00" (that is, "3").
If the detection is performed only when the value changes to “0”, the value of the third bit or more of the counter 5 cannot be properly incremented when undetected (for example, skipping) occurs, and the third bit This is because an error occurs in the above count value.

Therefore, the 2-bit data supplied from the data converter 4 changes from "10" to "00" (that is, "2" to "2").
“0”) or “11” → “01” (that is, “3”)
Even if the value changes to “1”, the increment condition has a range so that the value of the third bit or more of the counter 5 is incremented, thereby compensating for a malfunction caused by detection of only the rotation detectors 2a and 2b and counting error. Has been eliminated.

Further, the counter controller 6 controls the 3 bits of the counter 5 even when the reel base 1 rotates in the forward direction (playback, fast-forward direction) or in the reverse direction (rewind direction) for some reason. When the 2-bit data supplied from the data converter 4 changes from "00" to "11" (that is, "0" to "3") so that an error does not occur in the count value of the counter 5 or more, The value of the third bit or more is decremented.

Conversely, when the reel base 1 is rotating in the reverse direction (rewind direction), the counter controller 6 sets the 2-bit data sequentially supplied from the data converter 4 to "00" →
When the value changes to "11", the value of the third bit or more of the counter 5 is decremented. Here, the 2-bit data (b ₁ , b ₂ ) is “0” as shown in FIG.
Not only when it changes from "0" to "11", but also "00" →
Also when the value changes from "10", "01" to "11", the value of the third bit or more of the counter 5 is decremented.

This means that the decrement of the value of the third bit or more of the counter 5 is sequentially supplied from the data converter 4 to 2.
If the detection is performed only when the bit data changes from “00” to “11”, the decrement of the value of the third bit or more of the counter 5 can be performed successfully in the case where an undetected state (eg, skipping) occurs. This is because an error occurs in the count value.

Therefore, the 2-bit data sequentially supplied from the data converter 4 is changed from "00" to "10" or "0".
Even if the value changes from "1" to "11", the decrement condition has a width so that the value of the third bit or more of the counter 5 is decremented, thereby compensating for a malfunction caused by the non-detection of the rotation detectors 2a and 2b. The occurrence of counting errors has been eliminated.

Further, when the reel base 1 is rotating in the reverse direction (rewind direction) or when the reel base 1 is rotated in the forward direction (playback or fast-forward direction) for some reason, the counter controller 6 controls the three bits of the counter 5. If the 2-bit data sequentially supplied from the data converter 4 changes from "11" to "00" so that an error does not occur in the count value higher than the first count, the counter 5
The value of the third bit or more is incremented.

When the power of the counter device is turned off and the rotation of the reels is stopped, the counter 5 naturally stops counting. In this embodiment, data conversion is performed immediately before the counter 5 stops counting. The 2-bit data (b _1E , b _2E ) supplied from the device 4 is stored in the memory 7. When the power is turned on again and the tape reel rotates, the counter 5 starts counting by the above-described operation. Here, the 2-bit data supplied from the data converter 4 to the counter 5 at the start of counting is used. The comparator 8 compares (b _1S , b _2S ) with the 2-bit data (b _1E , b _2E ) stored in the memory 7.

For example, assume that 2-bit data (b _1E , b _2E ) stored in the memory 7 is “11”. If it is assumed that the reel hardly moves when the power is turned off, the 2-bit data (b _1S , b
_2S ) should be "11". However,
If the two-bit data (b _1S , b _2S ) supplied from the data converter 4 at the start of counting is “00”, that is, if it has changed from “11” to “00”, some sort of power-off occurs. This is the case where the reel has moved slightly in the forward direction due to the cause, and the value of the third bit or more of the counter must be incremented at the start of the counting. Therefore, in such a case, the value of the third bit or more of the counter 5 is incremented by the counter controller 9.

Conversely, suppose that the 2-bit data (b _1E , b _2E ) stored in the memory 7 is “00”. Then, 2 supplied from the data converter 4 at the start of counting
When the bit data (b _1S , b _2S ) is “11”,
In other words, if the state has changed from "00" to "11", the reel has moved slightly in the opposite direction for some reason when the power is turned off, and the third bit or more is decremented as the counter value. This is the case. Therefore, the value of the third bit or more of the counter 5 is decremented by the counter controller 9. As a result, it is possible to eliminate a counting error of the counter 5 that may occur when the counting and stopping of the counter 5 are performed.

Next, as a second embodiment, the rotation detector 2
The case where a and b are intermittent operations will be described. The configuration of the counter device is the same as that of FIG. In this case, the drive power of the rotation detector 2 is intermittently supplied as shown in FIG. 5, and the rotation detection signal output from the rotation detector 2 is an intermittent signal as shown in FIG.

When the rotation detector 2 is intermittently driven as described above, the rotation detection signal also becomes an intermittent signal. For example, as compared with the continuous rotation detection signal, the reel suddenly rotates at a high speed or temporarily rotates reversely. Erroneous detection or non-detection (for example, skipping) often occurs due to such a factor.

However, as described above, the counter controller 6 increments the value of the third bit or more of the counter 5 by "11" → "00", "10" → "0".
0 ”,“ 11 ”→“ 01 ”, and incremented as one of“ 00 ”→”
Prevent the occurrence of a counting error of the counter 5 by giving a range to each condition such as decrementing at any of "11", "01" → "11", "00" → "10". Can be.

Therefore, the rotation detector 2 can be driven intermittently, and power can be saved. Further, in order to promote power saving, the cycle of the driving power supply of the rotation detector 2 may be made wider.

In this embodiment, the case where two rotation detectors 2 are used has been described, but the number of rotation detectors 2 is m.
(Where m is the number of bits of the counter 5) or less, and by increasing the number of rotation detectors 2, a more accurate counter device can be realized. The present invention can also be applied to an arrangement in which an N / S pattern is arranged on a reel base and rotation is detected using a magnetic field detection element such as a plurality of Hall elements.

[0035]

As described above, according to the present invention,
The rotation detection signal detected from the reel base by the rotation detector is n
By converting the data into bit data and assigning it to the lower n bits of the counter, and increasing or decreasing the value of the (n + 1) th bit or more of the counter according to the n-bit data, a high-precision counter device with no counting error can be provided. Can be realized.

The increment / decrement condition of the (n + 1) th bit or more of the counter is determined by
A plurality of combinations are set as a combination of one bit data, and the increment / decrement conditions are given a range, so that a rotation detection error can be compensated and the counter accuracy can be further improved. In addition, accurate counting can be performed even when the rotation detector is intermittently driven, and power saving can be realized.

Furthermore, since the n-bit data at the time of counting stop is stored and compared with the n-bit data supplied at the start of counting, increment / decrement of the (n + 1) th bit or more of the counter is performed. It is possible to prevent the counting error of the counter caused by the movement of the reel base when stopping.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a block diagram of a counter device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a rotation detection signal and a digitization of the rotation detection signal of the counter device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a conversion table for converting a rotation detection signal of the counter device according to the embodiment of the present invention into 2-bit data.

FIG. 4 illustrates a counter 3 of the counter device according to the embodiment of the present invention.
FIG. 11 is a diagram showing a condition for increment / decrement of a value of a bit or more.

FIG. 5 is a diagram showing a drive waveform of a rotation detector and a waveform of a rotation detection signal according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 reel 2 rotation detector 3 waveform / numerical converter 4 data converter 5 counter controller 6 counter 7 memory 8 comparator 9 counter controller 10 microcomputer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/093 311 G11B 15/03

Claims (3)

(57) [Claims] 1. The method according to claim 1, wherein the rotation of the tape reel base is defined as upper m bits.
Tape detected by counter consisting of lower n bits
In the tape-medium reproducing device for a tape-shaped recording medium, the phases are different from each other based on the rotation of the tape reel base.
And n number of rotation detecting means for outputting a signal, a detection signal outputted from the n-number of rotation detecting means predetermined
Data conversion means for converting into n-bit count data
And the count of n bits converted by the data conversion means.
The upper m bits of the counter based on the data change
Count control means for controlling the count, and the lower n bits of the counter are provided to the data conversion means.
The converted n-bit count data is substituted.
Tape media reproduction of tape-shaped recording media
apparatus. 2. Counting of upper m bits of said counter
Is controlled from the n-bit first count data.
When the count data changes to n-bit second count data,
3. The tape medium of the tape-shaped recording medium according to claim 1,
Playback device. 3. Counting of the upper m bits of the counter
Is controlled from the n-bit first count data.
When the count data changes to n-bit second count data,
The count of the upper m bits is increased, and
From the count data of 2, the first count of the above n bits
When changing to data, the count of the upper m bits is
3. The tape-shaped recording medium according to claim 2, wherein the tape-shaped recording medium is reduced.
Tape media playback device.