JPS6334111Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a recording circuit for recording a tape recording position detection signal.

Recently, it has been considered to record a recording position detection signal (hereinafter referred to as a CUE signal) at the beginning of a recorded song to automatically locate the beginning of recorded content, such as music.

By the way, so-called square wave recording is generally used for this type of CUE signal, in which N and S poles are alternately recorded. Some devices supply recording current by switching the direction of the recording current to the recording head so that poles are alternated.

However, with this device, the direction of the recording current is switched to obtain N and S poles alternately, which not only complicates the circuit, but also makes it difficult to adjust the recording current in both directions in a well-balanced manner to achieve the best recording level.
One drawback was that the CUE signal recording was extremely unstable.

This idea was made to eliminate the above drawbacks, and by saturated erasing the tape with one polarity in the erasing head and intermittently magnetizing it with the other polarity via the recording head, it made recording of CUE signals extremely stable. It is an object of the present invention to provide a signal recording circuit for position detection, which can be used to detect a position and whose circuit can be simplified.

An embodiment of this invention will be described below with reference to the drawings.

In Figure 1, 1 is a tape, and this tape 1
is sent out from the supply reel 2 and transferred to the take-up reel 3.
The reel 2 is wound on the reel 2 and runs between the reels 2 and 3.

Corresponding to the tape 1, an erasing head 4 made of, for example, a permanent magnet is provided. This erasing head 4 saturates and erases the tape 1 with one polarity, for example, the S pole.

A recording head 5 is provided next to the erasing head 4. In this case, the recording head 5 is arranged so as to correspond to the tape 1 which has been saturated and erased by the erasing head 4.

Further, one end of the recording head 5 is grounded, and a limiter circuit 6 having a resistor _R2 and _a diode _D1 is connected to the other end via a current adjustment impedance, for example, a resistor _R1 . Through the erasing head 4, a unidirectional rectangular wave recording current is supplied to the tape 1, which has been magnetized to the S pole, in order to intermittently magnetize it to the N pole.

Here, the limiter circuit 6 is provided to prevent the recording current from being adversely affected by battery voltage fluctuations when a battery is used as a power source. Therefore, it can be omitted if a stable recording current is guaranteed.

However, with the recording circuit configured in this way,
To record a CUE signal, first the tape 1 is saturated and erased to the south pole using the erasing head 4.

In this state, the limiter circuit 6 is connected to the recording head 5.
When a recording current _{i 1 having} a rectangular shape as shown by the solid line in FIG. As a result, a so-called rectangular wave-recorded CUE signal in which north and south poles are recorded alternately is obtained. And the CUE recorded like this
During reproduction, the signal is read out as a reproduction output voltage e as shown by the solid line in FIG.

In this case, if a capacitor C ₁ is connected in parallel to the current adjustment resistor R ₁ , the rise of the recording current i ₁ will be
Shaping can be performed as shown by the broken line in the figure, thereby making it possible to make the positive and negative peak values of the output voltage e during reproduction substantially the same.

Therefore, with such a configuration, the tape is saturated and erased in one polarity by the erasing head in advance, and in this state, a unidirectional recording current is supplied to the recording head to intermittently magnetize the other polarity. As a result, the circuit configuration can be significantly simplified compared to the conventional system in which the direction of the recording current is switched and supplied to the recording head in order to alternately obtain N and S poles on the tape. In addition, the best recording level can be adjusted simply by adjusting the unidirectional recording current to the recording head using an adjustment resistor, making it possible to record CEU signals extremely stably.

Note that this invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist. For example, in the above description, the erasing head 4 magnetizes the tape 1 to the S pole, and the recording head 5 obtains intermittent N-pole magnetization.
It is magnetized to the N pole at the recording head 5, and the S
It may also be possible to obtain polar magnetization. Furthermore, the recording head 5 can also be a stereo head. In this case, it is important to prevent the recording current i ₁ from flowing too much using the current adjustment resistor R ₁ in order to prevent crosstalk from increasing.

As described above, according to this invention, the tape is saturated and erased to one polarity by the erasing head, and is intermittently magnetized to the other polarity via the recording head, thereby recording the CUE signal in an extremely stable manner. Therefore, it is possible to provide a signal recording circuit for position detection, which can perform the following functions and simplify the circuit.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of this invention, and FIGS. 2 and 3 are waveform diagrams for explaining the operation of the embodiment. 1...Tape, 2, 3...Reel, 4...Erasing head, 5...Recording head, 6...Limiter circuit, _R1 , _R2 ...Resistor, _D1 ...Diode, _C1 ...
...capacitor.

Claims (1)

[Claims for Utility Model Registration] (1) Equipped with an erasing head that saturates and erases the tape to one polarity, and a recording head to which a rectangular wave recording current is applied and intermittently magnetizes the tape to the other magnetic polarity. A signal recording circuit for position detection featuring: (2) The signal recording circuit for position detection according to claim 1, characterized in that an impedance for adjusting the recording current is connected to the recording head. (3) The signal recording circuit for position detection according to claim 2, characterized in that a capacitor is connected in parallel with the impedance. (4) Claim 1 of the utility model registration, which is characterized in that a limiter circuit is connected to the recording head.
The position detection signal recording circuit according to any one of items 1 to 3.