JPS63249955A - Recording information reproducing device - Google Patents

Abstract

PURPOSE:To accelerate the program searching of music, by driving an information recording carrier at second speed faster than first speed when the relative speed of an information reading means of the information recording carrier for a recording track reaches within a prescribed range while a magnetic tape is driven at the first speed at the time of fast forwarding or rewinding the tape. CONSTITUTION:At the time of fast forwarding or rewinding the information recording carrier 2, the information recording carrier 2 is driven at the first speed by a first driving means. While the information recording carrier is driven at the first speed, and when the relative speed of the information reading means 6 for the recording track reaches within the prescribed range, a PLL circuit goes to a locked state, and in such state, the information recording carrier 2 is driven at speed faster than the first speed by a second driving means. Therefore, when fast forwarding or rewinding is instructed, the information recording carrier is driven at high speed, and also, the read of information from the information recording carrier can be performed. In such a way, it is possible to keep the locked state of the PLL circuit 9 and to perform the fast forwarding or the rewinding at high speed compared with a case where the fast forwarding and the rewinding is performed at constant speed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a recorded information reproducing apparatus for reproducing recorded information from an information recording carrier on which information is recorded as a PCM signal in a tilted azimuth method. The present invention relates to a recording/reproducing apparatus that controls the speed of a carrier according to the relative speed of an information detecting means with respect to a recording track of an information recording carrier.

(Prior Art) A recorded information reproducing device in which information is recorded as a PCM signal in a tilted azimuth method, such as a digital audio tape recorder (DAT).
For $, fast forward (FF) or rewind R
When an instruction (EW) is issued, the information recording carrier is driven at a speed faster than the normal playback speed (hereinafter referred to as the first speed).

(Problems to be Solved by the Invention) As mentioned above (when the information recording carrier is driven at a high speed during FF/REW, the relative speed between the information recording carrier and the information reading means changes from that during normal reproduction, and the information PL for reading
There was a problem in that the L circuit became out of synchronization, making it impossible to read information.

Furthermore, if the driving speed of the information recording carrier is slowed down, the PLL circuit will not be out of synchronization and the information will not be readable, but there is a problem in that it takes time to wind up the information recording carrier.

As mentioned above, there is a conflict between the speed of reading information and the speed of driving the information recording carrier.

An object of the present invention is to provide a recorded information reproducing device that solves the above problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention is constructed as follows.

An information reading means for reading the PCM signal is run on the recording track of the information recording carrier on which information is recorded in the form of a PCM signal in an inclined azimuthal manner, and an output from the information reading means is supplied to a PLL circuit to record the recorded PCM signal. In a recorded information reproducing apparatus for reading, a first drive unit drives the information recording carrier at a first speed in response to a fast forward or rewind instruction of the information recording carrier.
a driving means; a detecting means for detecting that the relative speed of the information reading means with respect to the recording track falls within a predetermined range during gw at the first speed; and a second driving means for driving the information recording carrier at a second high speed.

(Operation) In response to a fast-forward or rewind instruction for the information recording carrier, the information recording carrier is driven by the first driving means at the first speed.

The first speed is set to be faster than the speed of the information recording carrier during normal reproduction. The detection means detects that while the information recording carrier is being driven at the speed of box 1, the relative speed of the information reading means with respect to the recording track is within a predetermined range, that is, the relative speed is approximately equal to the relative speed in the normal reproduction state. Detected. By this detection, the recorded information recorded on the recording track is read out by the information reading means.

When the relative speed is within a predetermined range by the detection means, the PLL circuit is not locked, and in this state the information recording carrier is driven by the second drive means at a faster speed than the first drive means. However, the PLL circuit remains locked. Therefore, when FF or RIiW is instructed, the information recording carrier is driven at high speed, and information can also be read from the information recording carrier. As a result, the lock of the PLL circuit is not released compared to the conventional case (when driving at a constant speed during FF or REW), and the FF due to high speed
F or REW is possible.

(Example) Hereinafter, the present invention will be explained based on an embodiment.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and is an example when applied to an R-DAT.

1 is a rotating drum on which a magnetic head 6 is mounted, 2 is a magnetic tape, 3 is a reel stand on which the magnetic tape is wound, 4 is a capstan, and 5 is a pinch roller. PC
The M-format information is recorded on the magnetic tape 2, and the capstan 4 drives the magnetic tape 2 to run while being wound around the rotating drum 1 at 90 degrees.
The rotary drum 1 is configured to be rotationally driven by.

In a normal reproduction state, the magnetic head 6 is driven so that the relative speed of the trajectory of the magnetic head 6 with respect to the recording track on the magnetic tape 2 becomes a predetermined value (normal relative speed). In this state, the changeover switch 28, which will be described later, is not switched and the bias voltage 30 applied to the contact 28e is applied to the reel.
The magnetic tape 2 is pulled by a capstan 4 and driven at normal reproduction speed.

On the other hand, the output of the magnetic head 6 is taken out via a rotary transformer, and is sent to the PL via an RF amplifier 7 and an equalizer 8.
The PCM synchronization signal A is supplied to the L circuit 9, and the PCM synchronization signal A is output from the PLL circuit 9. The PLL circuit 9 includes a phase comparator 10. A low-pass filter 11 to which the phase comparison output from the phase comparator 10 is input, and a voltage-controlled oscillator whose error voltage output from the low-pass filter 11 is supplied as a control voltage and whose output is supplied as a reference signal B to the phase comparator 10. It consists of 12.

PCM synchronization signal upper processing circuit 1 from PLL circuit 9
3, signal processing is performed, and audio data is output. The PLL lock signal C from the PLL circuit 9 is supplied to a PLL lock detection circuit 14 to determine whether the PLL is locked.

The signal processing circuit 13 outputs a rotation reference signal to the drum rotation control circuit 15, and the rotary drum 1 is rotationally driven by the output of the drum rotation control circuit 15 via the sitram driver 16. The rotation speed of the drum 1 is detected by a frequency generator 17, compared with a reference signal in a comparator 18, and converted into a digital signal. Further, the rotational phase of the drum 10 is detected by a phase detector 19, compared with a reference signal in a comparator 20, and converted into a digital signal.

The comparators 18 and 20 and the PCM synchronization signal are supplied to the ram rotation control circuit 15 to drive the drum 1 at a predetermined speed via the drum driver 16 during normal playback, and the reel is driven by receiving the bias voltage 30. The relative velocity of the trajectory of the magnetic head 6 on the recording track of the magnetic tape 2 is set not to be the normal relative velocity, and the trajectory of the magnetic head 6 is made to coincide with the recording center of the PCM signal on the magnetic tape 2.

On the other hand, the subcode data E recorded on the magnetic tape 2 from the signal processing circuit 13, the lock determination output F1 from the PLL lock detection circuit 14, and the output from the drum rotation control circuit 15 are supplied to the control circuit 22. A switch signal for specifying normal reproduction, F'F, and REIW is supplied to the control circuit 22. During the normal playback instruction, the above-mentioned process is followed. FF or R] FF or R during iw instruction
According to instructions from IiW, changeover switch 28 is changed to contact 281L or 28b, and changeover switch 23 is changed to contact 23. Then, when the PLL lock determination output is generated, the selector switch 23 is switched to the contact 23□ side. When the contact position of the changeover switch 23 is switched to the contact 23□ side, a low frequency oscillation output is output from the oscillator 24, and when it is switched to the contact 23° side, a high frequency oscillator force is output from the oscillator 24. Further, during the FF or REW instruction, the distance between the capstan 4 and the pinch roller 5 is widened, and the running speed of the magnetic tape is determined by the rotational speed of the reel. The running speed of the magnetic tape 2 is detected by a frequency generator 25, and the output of the frequency generator 25 is detected by an oscillator 24.
The output is sampled by the sample hold circuit 26 as a sampling pulse, and the sample hold circuit 26
The output of is integrated by an integrating circuit 27. The output of the integrating circuit 27 is sent to the reel motor driver 291 via the contact 28a of the changeover switch 28, and to the reel motor driver 291 via the contact 28b. is applied to

In this embodiment, when an FF instruction is given to the control circuit 22, the control circuit 22 causes the changeover switch 23 to
1 side, the changeover switch is output, and the output of the frequency generator 25 is sampled and held by the sample and hold circuit 26. The output of the sample and hold circuit 26 is applied to an integration circuit 27 and integrated. The output of the integrating circuit 27 is substituted for the bias voltage 30 and is applied to the reel motor driver 29 via the changeover switch 28a.
．． is applied to the magnetic tape 2, and the magnetic tape 2 is driven to a medium speed corresponding to a speed faster than the normal playback speed. This drive waits until the fi PLL circuit 10 becomes locked.

Note that the above-mentioned medium speed is normally selected to be a speed at which the PLL circuit 10 does not become unlocked. When driven to medium speed, the drum reference signal output from the signal processing port w113 is compared with the PCM synchronization signal in the drum rotation control circuit 15, and the comparison output is used to control the drum rotation control circuit 15.
is driven at a higher rotation speed than during normal playback.

During this time, the PLL lock signal output from the PLL circuit 10 is supplied to the control circuit 22 via the PLL lock detection circuit 14 and is monitored. When it is detected that the PLL circuit 10 is in a locked state, the changeover switch 23 is switched to the contact 232 side by the output from the control circuit 22. Due to this switching, the oscillation frequency of the oscillator 24 becomes higher than that when switching to the contact 231 side.
The frequency of the sampling pulse supplied to the sample hole P circuit 26 becomes higher. Therefore, the integrating circuit 27
The output of the reel increases and the reel is driven at a high speed which is faster than the medium speed. During this time, the PLL lock detection circuit 14 determines whether the PLL lock signal is PLL locked, and the control circuit 22 checks this. Even when the magnetic tape 2 is driven at high speed by driving the reel at the above-mentioned high speed, the PLL circuit 9 follows the driving of the magnetic tape 2 and continues to perform PLL lock. Therefore, even during this high-speed drive, it is possible to read the subcodes recorded on the magnetic tape 2. Further, when the PLL lock is released, the control circuit 22 returns the reel speed to the medium speed.

Further, when a REW instruction is given to the control circuit 22, the changeover switch 28 is switched to the contact 28b by the control circuit 22, and the output of the integrating circuit 27 is transferred to the reel motor driver 29.
The supply reel is driven by the output of the integrating circuit 28, and the magnetic tape is driven at medium speed, then at high speed.

This is the same as when the FF instruction is issued.

The operation of the control circuit 22 described above is shown in FIG. 2 in the form of a flowchart.

During normal playback or stop, FF or REV
When an instruction is given (step a), the reels are driven to rotate at a medium speed (step b), and wait until the PLL circuit 9 is locked (step C). In step C, the PLL circuit 9
If the lock is detected, the reel is driven to rotate at high speed (step d).

As long as the PLL circuit 9 continues to be locked following the reel driving in step d (step e), the reel is driven at high speed, and when a normal playback or stop signal is supplied (step ff), normal playback or Moved to stop mode. When it is detected in step e that the PLL circuit 9 is unlocked, the reel is returned to the medium speed again.

In addition, the above example shows the case where the speed is set to two stages, medium speed and high speed, when the FF or R]liW instruction is given, but when the magnetic tape 2 enters the recording area from the non-recorded area due to the presence or absence of the RF double signal. The speed is set low so that the PLL circuit 9 can easily lock, and it is turned off from the point where there is a record.

The speed may be set to medium speed at the first start when switching to R11W, and the speed may be changed to high speed after the PLL circuit 9 is locked at the medium speed.

If this state is schematically shown, for example, FIGS. 3(a) and (b)
) and as shown in FIGS. 4(a) and (b).

Figure 3 shows F'F or RIilW from the place where there is no RF double signal.
When set, the reels are driven at a low speed, and when the PLL circuit 9 is locked, the reels are driven at a medium speed, and then at a high speed.

In FIG. 4, the reel is driven at a medium speed when the FF or REW is set from a place where there is an RF multiplied signal, and when the PLL circuit 9 is in a locked state, the reel is driven at a high speed.

(Effects of the Invention) As explained above, according to the present invention, the magnetic tape is driven at the first speed during FF or REW, and the information reading means for the recording track of the information recording carrier is driven at the first speed. When the relative speed falls within a predetermined range, the information recording carrier is driven at a second speed that is faster than the first speed, so the speed during FF or REW increases, making it easier to find the beginning of a song, etc. becomes faster.

For example, in the case of DAT, when a magnetic tape as an information recording carrier is used for playback of a length of 2 hours, FF
Or 6 to fast forward or rewind the entire length when REW.
It took about 5 seconds, but according to the present invention, it took about 45 seconds.
), it can be shortened by about 20 seconds.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of an embodiment of the present invention. FIG. 3 and FIG. 4 are schematic diagrams for explaining a modification of one embodiment of the present invention. 1... Drum, 2... Magnetic tape, 3... Reel stand, 4... Capstan, 6... Magnetic head, 7...
...RF amplifier, 8...Equalizer, 9...PLL
Circuit, 10... Phase comparator, 11... Low/f filter, 12... Voltage controlled oscillator, 13... Signal processing circuit, 14... PLL lock detection circuit, 15...
Drum rotation control circuit, 16... drum driver, 23
and 28... changeover switch, 24... oscillator, 2
5... Frequency generator, 26... Sample Hall r circuit, 27... Integrating circuit. Patent applicant Kenwood Co., Ltd. Patent attorney Nobuo Sunako (and 1 other person) Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) An information reading means for reading the PCM signal is run on a recording track of an information recording carrier on which information is recorded in the form of a PCM signal in an inclined azimuthal manner, and the output from the information reading means is supplied to a PLL circuit. In a recorded information reproducing apparatus that reads a recorded PCM signal, a first driving means drives the information recording carrier at a first speed in response to a fast-forward or rewind instruction of the information recording carrier, and a first driving means that drives the information recording carrier at a first speed while driving the information recording carrier at the first speed; a detection means for detecting that the relative speed of the reading means has fallen within a predetermined range; and a second drive means for driving the information recording carrier at a second speed higher than the first speed based on the detection output from the detection means. A recorded information reproducing device comprising: (2) The recorded information reproducing apparatus according to claim 1, wherein the detecting means is a PLL lock detecting means for detecting that the PLL circuit is phase-locked. (3) The recorded information reproducing apparatus according to claim 1, wherein the predetermined range is a relative speed during normal reproduction.