JPS642244Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a tape recorder, tape player, etc., and relates to a device for covering up sound traces when a magnetic tape is automatically reversed.

With the advent of reverse decks that automatically reverse the tape, long-term continuous recording and playback has become possible and has been used in a variety of ways. When playing back after recording,
The drawback is that the music cuts out for a moment when the music is reversed.
In this regard, various improvements, particularly mechanical improvements, have been made to shorten the reversal time as much as possible, but at present it is not possible to completely reduce the reversal time to zero, and in the future this reversal time will be reduced to, for example, 0.1. It was hoped that the time would be shortened even by seconds.

This idea was made in view of the above points,
It is an object of the present invention to provide a device that uses echoes to cover up the traces of sound that occur during this reversal.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, 1 is a magnetic tape used in a cassette deck, 2 is a leader tape connected to the end or the beginning of the magnetic tape, 3 is a playback head, and 4 is an amplifier, and the output transmission path of the amplifier is an output terminal. Connect to 5. At the same time, the output transmission line is branched and connected to an echo circuit 6, and the output side of the echo circuit is connected to the above output transmission line via an analog switch 7. Further, 8 is an infrared sensor sandwiching the leader tape 2 and composed of a light emitting element and a light receiving element, and the output side of the infrared sensor is connected to a well-known system control circuit 9 built in the tape deck. For example, when the magnetic tape 1 is reversed from forward to reverse, the system control circuit sends signals to timely command the movement of the recording/playback head in the tape width direction, switching of the amplifier, switching of the rotary drive system, etc. A shaping circuit branches the transmission line for controlling the amplifier out of the output of the system control circuit and connects it to the analog switch 7.

Next, the operation will be explained using FIGS. 1 and 2. For example, when the magnetic tape 1 runs in the direction of arrow X during forward playback, the playback head 3 detects signals such as music recorded on the magnetic tape and inputs them to the amplifier 4. The reproduced signal amplified by the amplifier is reproduced by a speaker or the like via the output terminal 5. Thereafter, when the magnetic tape 1 approaches the end, the infrared sensor 8 detects the leader tape 8 in the transparent part and gives a command to the system control circuit 9. The system control circuit sends a control pulse to the amplifier and analog switch 7 simultaneously with the detection by the infrared sensor 8, and operates (closes) the analog switch 7 at the same time as switching the amplifier. As shown in Figure 2, the timing of this tape reversal is determined by the infrared sensor 8.
Even if this is detected and a control pulse is sent to the mechanical system, the rotary drive unit cannot be stopped instantaneously due to inertia, etc., so the magnetic tape will stop after a delay of t ₁ second. Therefore, during that time (t ₁ second), a reproduction signal is detected by the reproduction head 3 and is outputted to the output terminal 5 via the amplifier 4, and is also input to the echo circuit 6. Therefore, the echo circuit 6 generates a delayed reproduction signal based on the reproduction signal, which is combined with the original reproduction signal via the closed analog switch 7 and output to the output terminal 5. Further, after the rotational drive system stops after _t1 seconds, it rotates in the reverse direction after _t2 seconds to perform reverse reproduction. At this time, a control pulse is applied to the analog switch 7 so as to open the circuit _t3 seconds after the reverse reproduction is performed. In this way, by activating (closing) the analog switch 7 for t seconds, echoes are generated before and after the time when the magnetic tape 1 is completely stopped (t ₂ seconds), and the traces are removed when the tape is reversed. cover it so that people don't understand it.

Note that the echo circuit 6 used in the above embodiment is supposed to have two circuits, L and R, but it is also possible to use only L or R, and the echo circuit attached to either one can be connected to the left and right speakers. You can also output it. Furthermore, it is also possible to attach a manual switch in parallel to the analog switch 7 used in the above embodiment, so that the echo can be used at any time.

Since the present invention is constructed as described above, in a tape recorder equipped with a reversing device that automatically reverses the tape, there is provided a reproducing head 3 for detecting a signal recorded on a magnetic tape 1, and an output transmission path of the reproducing head. a first means such as an echo circuit 6 for delaying the reproduced signal branched from the magnetic tape 1; a second means such as an analog switch 7 for selectively passing the reproduced signal from the first means; A sensor such as an infrared sensor 8 detects the leader tape 2 connected to the terminal end, and when the sensor detects the leader tape 2, the first stable state is reached, and the magnetic tape 1 is reversed and the playback head 3 becomes magnetic. Immediately after detecting the recording signal of the tape 1, the third part of the system control circuit 9 etc. enters the second stable state.
means, and when the sensor detects the magnetic tape 1 and the third means reaches the first stable state, the second means is operated to pass the delayed reproduction signal and reproduce the original reproduction signal. Immediately after the magnetic tape 1 is reversed and reverse playback is performed, the third means enters the second stable state, the second means is opened, and the original playback signal is output. Even if the reproduced sound is cut off when the tape is reversed, it is possible to compensate for the cut-off of the sound by adding an electric means, that is, an echo circuit.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a block diagram and FIG. 2 being a diagram for explaining the operation of FIG. 1. 1...Magnetic tape, 2...Leader tape, 3
... Reproduction head, 6 ... Echo circuit, 7 ... Analog switch, 8 ... Infrared sensor, 9 ... System control circuit.

Claims (1)

[Scope of utility model registration request] A tape recorder with a reversing device that automatically reverses a tape, comprising: a playback head for detecting a signal recorded on a magnetic tape; a first means for delaying a playback signal branched from an output transmission path of the playback head; a second means for selectively passing the reproduced signal from the first means; a sensor for detecting a leader tape connected to the end of the magnetic tape; and a second means for selectively passing the reproduction signal from the first means; a second stable state immediately after the magnetic tape is reversed and the reproducing head detects a recording signal of the magnetic tape; When the means reaches the first stable state, the second means is operated to pass the delayed reproduction signal and output it together with the original reproduction signal, and the magnetic tape is reversed and reversed. A tape recorder with an automatic reversing device, characterized in that immediately after reproduction is performed, the third means enters the second stable state, opens the second means, and outputs only the original reproduced signal.