JPS59207041A - Magnetic reproducing device - Google Patents

Abstract

PURPOSE:To prevent the malfunction due to a cue signal without having the influence upon an essential information signal of music or the like by discriminating the cue signal recorded on an already sound recorded magnetic tape. CONSTITUTION:In case that the mode is switched to a cue mode or a review mode to detect an inter-music part, rotations of discs H1 and H2 interlocked with a take-up reel and a supply reel of the magnetic tape are detected by sensor parts S1 and S2, and signals having frequencies corresponding to detected rotation numbers are converted to voltage values by F/V parts 8 and 9, and converted voltage values are supplied to a voltage comparing circuit 10. On a basis of the detection time of a reproduced information signal which is proportional to the change of the running speed of the tape, the cue signal of a time shorter than this detection time and the reproduced information signal of a time longer than the cue signal are discriminated. The inter-music part is detected by the reproduced information signal other than the discriminated cue signal, and an inter-music part detection signal is supplied to a stopping solenoid 5 to stop the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION (Subject of the Invention) The present invention relates to a magnetic reproducing device 6, and particularly relates to a magnetic reproducing device 6, in which a magnetic reproducing device 6 has a cue signal recorded thereon, which is used when producing a recorded magnetic tape such as a music tape. The present invention relates to a magnetic reproducing device equipped with a circuit for determining a cue signal when reproducing a tape.

(Object of the Invention) The object of the present invention is to determine whether the cue signal recorded on the recorded magnetic field 7-1 is affected by the main information signal such as music #JI'? It is an object of the present invention to provide a magnetic reproducing device that can prevent malfunctions caused by cue signals without causing problems.

<Prior art and its problems> In general, magnetic tapes used for recording, such as music tapes or J5A tapes, are manufactured using high-speed dubbing. In addition to the main information signals such as music, magnetic tapes also contain frequency digits ranging from number 1 to number 1-NZ in order to distinguish the boundaries and cut each tape. A cue signal for output is recorded.This cue signal is normally removed from the tape as much as possible so that there is no adverse effect when playing back the manufactured tape, but at the end of the tape (or In many cases, parts recorded during a short period of time (around the beginning) remain.

In this way, the part of the cue signal recorded on a general pre-recorded magnetic tape is outside the frequency range that can be played by normal playback equipment, and should not affect the main playback information signal. However, some of the cue signals may be within the normal playable frequency range.

Therefore, this cue signal is transmitted to cassette 1, which is sent to a magnetic tape playback device such as a Nocolette deck.
This has caused malfunctions when starting a song by detecting gaps between songs or when reversing a cassette tape in a 2-1-reverse type playback device.

As a way to solve this problem, conventionally, for example, in a circuit for detecting between songs, as shown in FIG. In between, the passing of the cue signal () is prohibited (c h
), and since then, a bypass filter 3 has been installed to create a pass band such that the reproduced information signal of 1 is passed. Note that 5 stops the magnetic wave (1.1 in the figure). This is a solenoid for stopping the sound.This bypass filter 3 allows the passage of the main signal of the reproduction signal that enters the magnetic head 1. The magnetic tape (not shown) is stopped by supplying a horn detection signal from the track detection circuit 4 to a stop solenoid 5.

However, by providing a circuit (bypass filter 3) that prohibits (cuts) the passage of such cue signals from magnetic tape, the cue signals are prohibited (cut) due to differences in frequency bands.
In the conventional magnetic recording device, the bypass filter 3 also affects the passage of the main information signal such as music reproduced from the magnetic tape, and simultaneously changes the sensitivity of the level of the reproduced information signal. Therefore, there were problems such as malfunctions due to the influence of the bypass filter 3, especially in songs with low levels.

(Means for Solving the Problems) In order to solve the above problems and achieve the purpose, the present invention is designed to distinguish between cue number 13 recorded on a magnetic tape and other information signals. The detection time (period) of the reproduced information No. 43 can be arbitrarily set to determine the detection time, or the detection time of the information signal to be reproduced can be used to distinguish between the key Jg No. 43 and information signals other than I. The present invention provides a magnetic re/l' device which is characterized in that a circuit for determining the period of time is changed in proportion to the traveling speed of the magnetic tape.

<Embodiments of the Invention> The first and second embodiments of the magnetic reproducing device according to the present invention are described below.
This will be explained below along with the drawings. J3, the same part as the previous figure has the same ↑18, and its explanation will be omitted.

FIG. 2 is a diagram showing a first embodiment of the magnetic reproducing apparatus according to the present invention.

As shown in FIG. 2, the magnetic head 1 is connected to a head amplifier 2, and the head amplifier 2 is further connected to a song interval detection circuit 4, which includes a signal processing circuit such as an integrating circuit. The stop solenoid 5 is connected to the stop solenoid 5 through a signal discriminating circuit 6 which has a built-in section. A pulse signal is output only when the threshold level (threshold value) S is exceeded, and no signal is output in other cases.

With this configuration, the output reproduction signal aO+a1 from the head amplifier 2 shown in FIG. The interval detection signal is supplied to the signal discrimination circuit 6. In this signal discrimination circuit 6, the supplied inter-track detection signal is integrated by its integrating circuit to obtain an integrated signal shown as bO+bI in FIG. 3(B), and this No. 18 is a preset threshold level C in Figure 3 (C) only when S is exceeded.
A pulse signal indicated by 1 is output, and no signal is output in other cases. That is, as shown in Fig. 3, a signal for a period exceeding time T (the signal received by al in Fig. 3 (A)) is supplied, and its integral signal (Fig. 3 (B)) is supplied.
When the signal C1 exceeds the threshold level S, a pulse signal (signal shown as C1 in FIG.
) is supplied (the signal indicated by a, ) in Fig. 3(A)), and its integral (ffi signal (signal indicated by a, ) in Fig. 3(B)) is supplied.
The pulse signal is not output unless the signal (indicated by o) exceeds the threshold level S@. And output 1c
The pulse signal is supplied to the solenoids 5 for the blocks 1 to 5 to stop the magnetic tape (not shown).

In this way, set the above time T (i.e., threshold level S corresponding to time T) to a level long enough to allow the cue signal to be determined (for example, set the time constant of the integrating circuit) By doing so, it is possible to detect between songs by distinguishing between the 4-unit signal and other information signals such as music signals to be reproduced.

Next, a second embodiment of the magnetic reproducing apparatus according to the present invention will be described. FIG. 4 shows the second magnetic reproducing device according to the present invention.
Fig. 1 shows an example of the above.

As shown in FIG. 4, the magnetic head 1 is connected to a head amplifier 2, and the head amplifier 2 is further connected to a song interval detection circuit 4, which is connected to a stop solenoid via a time variable circuit 7. Connected to 5. This time variable circuit 7 changes the detection time of the reproduced signal in proportion to the change in the running speed of the Arp in order to discriminate the cue signal, and generates a signal of a shorter period (time) than the -C detection time according to the detection time. It is necessary to discriminate between a certain -1 to no signal and an information signal that is reproduced for a period (time) 6 longer than the other four signals.

On the other hand, I-1+ and H2 are disks C that rotate in conjunction with a magnetic tape take-up reel and a supply reel, respectively.

Sl and S2 are parts of sensors that detect the rotations of the disks 11 + and H2, respectively, and the disk H+.

A signal with a frequency corresponding to the rotational speed of each of l-12 is output. Further, 8.9 is a frequency/voltage conversion unit (F/V unit) that converts a frequency signal corresponding to the rotational speed of each of the discs H1 and H2 into a voltage value, and 10 is an F/V unit 8, 9.
This is a voltage comparison circuit that compares the output voltage values of the two and outputs the value of the voltage ratio.

Circle fA I-l +, t-l 2 (1) near (set() t? > sa part S + +S2 are respectively F/
It is connected to a voltage comparison circuit 10 via the V sections 8 and 9, and the voltage comparison circuit 10 is connected to the time variable circuit 7.

With this configuration, when detecting between songs in a manner similar to cue (fast-forward playback) mode or review (rewind playback) mode, the magnetic tape take-up reel or Discs 1-1 + each linked to the supply reel
, , 1-12 rotations are given as part S+.

Each of S2'C is detected, and a signal with a frequency corresponding to the detected rotational speed is converted into a voltage value by the 7/V section 8.9, and the converted voltage value is sent to the voltage comparison circuit 10.゛]'1 Supply. Then, the voltage comparator circuit 10 compares these voltage values and outputs a voltage ratio value, thereby adjusting the change in the rotational speed of the take-up reel and the supply reel and the change in the running speed of the tape. corresponding signal (voltage ratio III'J)
is supplied to the time variable circuit 7.

The time variable circuit 7 changes the detection time of the reproduction signal in proportion to the running speed of the tape for determining the cue signal based on the supplied signal. Then, depending on the detection time of the playback information signal that is proportional to the change in the tape running speed due to the difference in the position (place) where the tape is running or the difference in the length and type of tape, a period (hour) shorter than this detection time is determined. A discrimination is made between the "coe signal" and the information signal that is reproduced for a longer period (time) than other cue signals.

Detection between songs is performed by applying J to the reproduction information signal other than the determined cue signal, and supplying I f'3 to the solenoid 5 for the slots 1 to 1 to detect the magnetic tape (not shown). Stop it.

(Application example) d3. The detection time of the reproduction information signal, which changes in proportion to the tape running speed, may be set to a constant value at the shortest time.

Note that the present invention is not limited to the above-described embodiments, and may take various other configurations without departing from the spirit of the present invention.

(Effects of the Invention) Since the magnetic reproducing device of the present invention has the above-mentioned (7+1 configuration), it is possible to distinguish between -1-cos recorded on a pre-recorded magnetic tape and reproduce the main content of music, etc. The key feature of the cap is that it prevents malfunctions caused by the cue signal without affecting the information signal.

[Brief explanation of drawings]

FIG. 1 shows a conventional magnetic reproducing device, and FIGS. 2 and 4 respectively show a conventional magnetic reproducing device. Second
FIG. 3 is a diagram showing signals of each part in FIG. 2. 4... Song interval detection circuit, 6... Signal discrimination circuit, 7...
・Time variable circuit, 8.9... Frequency/voltage conversion section (F
/ ■ Part>, 10... Voltage comparison circuit, l-l 1. I
-12...Disk, 81.32...Part of the sensor.

Claims (2)

[Claims] (1) In order to distinguish between cue signals recorded on magnetic tape and other information signals, a circuit is installed to arbitrarily set the detection time (period) of reproduced information signals to discriminate between them. A magnetic reproducing device characterized by: (2) The detection time (period) of the information signal that is reproduced to distinguish between the key signal recorded on the magnetic tape and other information signals is proportional to the running speed of the magnetic tape. This magnetic playback device is characterized by a circuit that changes and discriminates the magnetic field.