JPH0650828Y2 - Magnetic tape player - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic tape reproduction in which the low-level recording portion or the non-recording portion (hereinafter referred to as “non-recording portion”) of the magnetic tape in the latter half of the magnetic tape is skipped and fast-forwarding. Regarding the device.

BACKGROUND ART In a conventional magnetic tape reproducing apparatus, there is an apparatus having a function of detecting a non-recording portion between songs. In such a magnetic tape reproducing apparatus, when the reproduction signal becomes lower than a predetermined signal level, it is judged that there is no recording, and the fast forward operation of the magnetic tape is started. Even during fast-forwarding, the signal recorded on the magnetic tape is reproduced, and the fast-forwarding operation is continued until the reproduction signal level exceeds a predetermined level.

The above operation is called the Frank skip function,
It aims to shorten the playback time of the unrecorded part as much as possible and to find the beginning of the song in a short time.

Problems to be Solved by the Invention In such a prior art, the above-described fast-forwarding operation of the non-recording portion is performed regardless of the reproducing portion of the magnetic tape. That is, it operates even in the non-recorded portion at the beginning of the magnetic tape or in a long portion between songs. However, when listening to music, what really wants to fast-forward the unrecorded portion is generally the unrecorded portion near the end of the magnetic tape.

Further, when an extremely low level music signal is recorded, for example, the pianissimo part of classical music is erroneously determined to be a non-recorded part, and a fast-forward operation may be performed.

An object of the present invention is to prevent unnecessary high speed running operation of a magnetic tape in a non-recording part.

Means for Solving the Problems According to the present invention, a period in which a recording level is lower than a predetermined reference level has passed a predetermined time, and a rotation speed of a supply reel is higher than a rotation speed of a take-up reel. A magnetic tape reproducing apparatus including a control means for performing a high-speed running operation of a magnetic tape when the rotation speed is predetermined.

According to the present invention, the control means detects the silent portion after a predetermined period of time when the recording level is lower than the predetermined reference level and detects the silent portion. The rotation speed of the supply reel and the rotation speed of the winding reel. Is detected, and it is detected that the rotation speed of the supply-side reel is higher than the rotation speed of the winding-side reel by a predetermined rotation speed, that is, the latter half of the magnetic tape, the high-speed running operation of the magnetic tape is performed.

Therefore, in the first half of the magnetic tape, the inter-track portion, and when the recording level is low, the fast-forwarding operation can be performed only by the latter half of the magnetic tape without performing unnecessary fast-forwarding operation.

Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention. The magnetic tape 2 of the supply-side reel 1 travels in the traveling direction 3 by a magnetic tape drive mechanism (not shown), and is wound around the winding-side reel 4. A rotation sensor 6, which is realized by a magnetic sensor or an optical sensor, is provided near the reel rotation shaft 5 into which the supply reel 1 is fitted. The rotation signal of the reel rotation shaft 5 output from the rotation sensor 6 is given to the control circuit 7. Further, in the vicinity of the reel rotation shaft 8 into which the winding-side reel 4 is fitted,
A rotation sensor 9 is provided. A rotation signal of the reel rotation shaft 8 from the rotation sensor 9 is given to the control circuit 7.

The magnetic head 10 reproduces the signal recorded on the magnetic tape 2 and supplies the reproduced signal to the control circuit 7.

Output signals from the control circuit 7 are given to the head drive circuit 11 and the reel drive circuit 13, respectively, and control the running state of the magnetic tape 2. The head drive circuit 11 controls the position of the magnetic head 10 to control the contact / non-contact / intermediate position with the magnetic tape 2 (described later), and the position of the pinch roller 14 to the reproducing position of the magnetic head 10. Only occasionally, control is performed so that the cap 15 is pressed. Reel drive circuit 13
Controls the rotation direction and the winding torque of the reel rotation shaft 8 on the winding side. The capstan 15 is rotating at a constant number of revolutions, and when the magnetic tape 2 is pressed against the capstan 15 by the pinch roller 14 (solid line),
When the tape travels at a tape winding amount corresponding to the rotation speed of the capstan 15, while the pinch roller 14 is separated from the capstan 15 (one-dot chain line), the magnetic tape 2 is wound at high speed.

The operation of this embodiment of the magnetic tape reproducing apparatus configured as described above will be described. FIG. 2 is a flow chart for explaining the operation of this embodiment. Step
From n0 to step n1, the control circuit 7 determines whether or not the blank skip switch (not shown) is turned on, and if it is turned on, it goes to step n2.

In step n2, the control circuit 7 calculates the rotation speeds N1 and N2 of the reel rotation shaft 5 on the supply side and the reel rotation shaft 8 on the winding side based on the rotation signals from the rotation sensors 6 and 9.

When the rotation speeds of the supply-side reel rotating shaft 5 and the winding-side reel rotating shaft 8 are calculated, the process proceeds to step n3, and the difference in the number of rotations between the two rotating shafts is obtained. If the calculated rotation speed difference is larger than the predetermined rotation speed N0, the process proceeds to step n4, and if it is smaller, step n2 is executed again. That is,
The magnetic tape 2 moves from the supply reel 1 to the take-up reel 4
The number of rotations of the reel rotating shaft 5 on the supply side increases and the number of rotations of the reel rotating shaft 8 on the winding side decreases as the reel is wound up. Therefore, it is possible to determine whether or not the reproducing portion of the magnetic tape 2 is in the latter half by obtaining the difference in rotational speed between the two rotary shafts.

At step n4, the reproduction signal level from the magnetic head 10 is judged.If it is higher than a predetermined threshold level, it is judged that the signal is recorded.If it is lower, it is judged that there is no recording section. , Go to step n5.

At step n5, the elapsed time T2 from the time point when the non-recording section is started is judged. Return.

At step n6, the unrecorded portion is wound around the winding-side reel 4 at high speed. That is, the control circuit 7 gives the head drive circuit 11 a signal for controlling the magnetic head 10 to an intermediate position where the magnetic head 10 is lightly contacted with the magnetic tape 2. The magnetic head 10 is at the intermediate position and the pinch roller 14 is the capstan shaft.
Since it is separated from 15, the reel rotation shaft 8 rotates at high speed, and the magnetic tape 2 is wound at high speed.

While the magnetic tape 2 is being wound on the winding side reel 4 at a high speed, the control circuit 7 inputs the reproduction signal from the magnetic head 10 and the reproduction signal level is compared with the threshold level. While the playback signal level from the magnetic head 10 is lower than the threshold level, the high-speed winding operation is continued, and when the playback signal level exceeds the threshold level, the high-speed winding operation is terminated and the normal playback operation is resumed. Start. If the reproduction signal level is lower than the threshold level up to the final end of the magnetic tape 2, the skip operation ends at the final end of the magnetic tape 2.

FIG. 3 is a timing chart for explaining the above blank skip operation in more detail.

FIG. 3 (1) is a diagram showing the reproduced signal, and FIG. 3 (2) shows the result of the control circuit 7 judging the signal recording state on the magnetic tape 2. FIG. 3 (2) is a diagram showing a running state of the magnetic tape 2. The control circuit 7 determines that the portion where the reproduction signal level exceeds the threshold level is the recording portion, and that the portion that is lower than the threshold level is the non-recording portion. As shown in FIG. 3 (3), at the time T1, the magnetic tape reproducing device is in the normal traveling operation. When the reproduction signal level falls below the threshold level at time t ₀ , the control circuit 7 determines that the magnetic tape 2 is the non-recording portion, and measures the elapsed time from time t ₀ . Elapsed time T2 is a predetermined time
When the control circuit 7 determines that T0 is exceeded, the high-speed winding operation is started. The magnetic tape reproducing apparatus detects the reproduction signal level even during the high-speed winding operation, stops the high-speed winding operation at time t ₁ when the reproduction signal level exceeds the threshold level, and thereafter performs the normal running operation.

As described above, in this embodiment, since the control circuit 7 constantly controls the running of the magnetic tape 2 while detecting the reproducing portion and the reproducing signal level of the magnetic tape 2, the fade-in in the front half portion or the central portion of the magnetic tape 2 is performed. However, it is possible to reproduce a tune that starts while playing, or a space that is intentionally vacated so as to make the user feel comfortable until the reproduction sound starts, and it is possible to realize a blank skip operation desired by the user.

Effects As described above, according to the present invention, the low-level portion only in the latter half of the magnetic tape is fast-forwarded without being reproduced by high-speed running, so that unnecessary fast-forward operation is prevented and a low level within a desired range in magnetic tape reproduction is prevented. You can fast-forward the part.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flow chart for explaining the operation of this embodiment, and FIG. 3 is a timing chart for explaining the operation of this embodiment. 1 ... Supply side reel, 2 ... Magnetic tape, 4 ... Winding side reel, 5 ... Reel rotation axis, 6 ... Rotation sensor,
7 ... control circuit, 8 ... reel rotation axis, 9 ... rotation sensor, 10 ... magnetic head, 11 ... head drive circuit, 13 ...
Reel drive circuit, 14 …… Pinch roller, 15 …… Capstan

Claims (1)

[Scope of utility model registration request] 1. A recording level lower than a predetermined reference level has passed a predetermined time, and a rotation speed of a supply reel is higher than a rotation speed of a winding reel by a predetermined rotation speed. In this case, the magnetic tape reproducing apparatus is characterized by including control means for performing a high speed running operation of the magnetic tape.