JPS6131534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reproducing apparatus that can easily locate the beginning of a signal recorded on a recording medium.

2. Description of the Related Art Conventionally, tape recorders are known that locate the beginning of a tape by detecting a cue signal recorded on a tape in cue or review mode. In such a tape recorder,
During playback, press the fast forward or rewind button to enter cue or review mode, and when the cue signal sound is heard from the speaker, release the fast forward or rewind button to automatically switch to playback mode. ing. However, the signal tone of the queue signal at the time of queue or review is e.g.
Because it is a short time of about 0.5 seconds, you must always listen carefully to the sound, and you must take your finger off the fast forward or rewind button as soon as you hear the signal sound, so timing is difficult. Therefore, cueing operations required considerable skill.

The present invention has been made in view of the above circumstances, and an embodiment in which the present invention is applied to a tape recorder will be described below with reference to the drawings.

In the tape recorder according to this embodiment, by pressing the cue signal recording button at any time during recording,
It is configured such that a cue signal of a predetermined frequency (for example, 25 Hz) can be recorded on the tape for a predetermined period of time (for example, 5 seconds). In addition, during playback of a tape on which the cue signal is recorded, press the fast forward or rewind button to cue or review, and when the cue signal is detected in this cue or review state, the tape is temporarily stopped. There is. At this time, if the fast forward or rewind button is held down, the cue or review will be performed again after a predetermined period of time (for example, 2 seconds) has elapsed, and will be temporarily stopped again by the next cue signal. Furthermore, if the fast forward or rewind button is released from the press while the tape is stopped for the predetermined time, the tape is immediately switched to the playback state and the tape is played back from the position of the cue signal.

The drawings show an embodiment of a circuit for performing the above operations.

First, the case where a cue signal is recorded during recording will be described. When the tape recorder is set to recording mode, switches 1, 2, and 3 are closed to the REC (recording) side contacts, respectively. Then, the switch 1 supplies the power supply voltage +B to the queue signal recording and automatic stop circuit 26. At the same time, the capstan motor 4 is controlled by the servo circuit 5 and rotated at a predetermined speed, so that the tape 6 runs. At this time, the transistor _Q8 is off, and thereby the servo circuit 5 is operated. Microphone 7
The audio signal obtained from
2 and recorded on tape 6. Also, a bias current obtained from a bias oscillator 13 is supplied to the recording head 12 via a transformer 14. The gain of the recording amplifier 9 is controlled according to the level of the input signal by an AGC circuit 15 composed of a diode D ₆ , a capacitor C ₉ and a transistor Q ₁₀ .

To record a cue signal in the above recording state, press the cue signal recording button 16 at any time. This lowers the base potential of transistor Q ₄ and turns on transistor Q ₄ . At this time, capacitor C ₄ is instantly charged through resistor R ₇ and the voltage at the point increases. Also, capacitor C ₃ is charged with the time constant of resistor R ₅ and the voltage at the point increases, so that transistor Q ₄ is turned off after charging of capacitor C ₄ is completed. The voltage at point is applied from point to transistor _Q5 through resistor _R8 , turning off transistor _Q5 and charging capacitor _C5 . _{The voltage at point is also applied to transistor Q 6 turning} it on. This increases the voltage at the point, and this voltage is applied to the anode of thyristor (PUT) Q ₇ . A constant voltage obtained by dividing the power supply voltage +B by resistors R ₁₃ and R ₁₄ is applied to the gate point of the thyristor Q ₇ through a diode D ₄ . Therefore, when the anode voltage at a point exceeds the sum of the gate voltage at the point and the offset voltage V _T of this thyristor _Q7 , this thyristor _Q7 is turned on. As a result, a predetermined cathode voltage is obtained at one end point of the resistor _R11 . This voltage is resistance
It is applied to _transistor Q ₉ through R ₁₆ , turning it on. This causes current to flow through the light emitting diode _D5 and the resistor _R17 , and
The collector voltage of this transistor _Q9 drops. As a result, the low frequency oscillator 17 connected to this collector via the switch 2 is operated, and its 25 Hz oscillation output signal is applied to the recording head 12 via the capacitor C ₈ and the resistor R ₁₉ , and is applied to the tape 6 as a cue signal. recorded in In this case, since the oscillation output signal is applied to the recording head 12 from the connection point between the equalizer circuit 11 and the bias oscillator 13 as shown in the figure, the cue signal is given a predetermined value regardless of the AGC operation of the recording amplifier 9. is recorded on tape 6 at the level of . At this time, the light emitting diode
_D5 will light up to indicate that the cue signal is being recorded. Also, since the base of transistor _Q8 is grounded via switch 3,
No voltage is applied to the point, and transistor _Q8 is kept off. Therefore, the servo circuit 5 continues to operate, and the motor 4 continues to rotate.

While the queue signal is being recorded, the capacitor _C4 is discharged mainly due to the time constant with the base impedance of the transistor _Q6 . Therefore, the anode voltage at the point gradually decreases, and when this voltage falls below the sum of the gate voltage and the offset voltage _VT , the thyristor _Q7 is turned off and the cathode voltage at the point becomes zero. As a result, transistor _Q9 turns off and the light emitting diode
When the light emission from _D5 disappears, the oscillation of the oscillator 17 stops, and the recording of the queue signal ends. Further, as the voltage at the point becomes 0, the voltage at the point decreases, thereby turning on the transistor _Q5 , and the capacitors _C4 and _C5 are discharged through the transistor _Q5 . The capacitance value of the capacitor _C4 is selected so that the queue signal is recorded for, for example, 5 seconds. Thereafter, normal recording is performed, and by pressing the cue recording button 16 at any time during this recording state, the cue signal can be recorded at a desired location on the tape.

Next, a case will be described in which the tape 6 on which the cue signal is recorded as described above is played back and a cue or review is performed during this playback. When the tape recorder is set to playback mode, switches 1, 2, and 3 are switched to the PB (playback) side contacts in conjunction with this. This causes the oscillator 17 to become a transistor.
It is disconnected from Q ₉ and the base of transistor Q ₈ is ungrounded. Further, the switch 18 is left on. Transistor Q ₈ is off, and motor 4 is rotated by servo circuit 5 at a predetermined speed. The audio signal reproduced from the tape 6 by the reproduction head 19 is sent to the preamplifier 20 and the power amplifier 2.
1 to the speaker 22. Next, in this reproduction state, when a fast forward or rewind button (not shown) is pressed, the switch 23 is closed and the power supply voltage +B is supplied to the circuit 26. In addition, the power supply voltage +B is the resistance R ₁₈ and the smoothing capacitor C ₇
Low pass filter 24 for detecting cue signal through
is also added to put the low-pass filter 24 into operation. Tape 6 is at normal running speed of 10 to 25
The tape 6 is run at twice the speed, and the playback head 19 is in light contact with the tape 6 at this time. As described above, this tape recorder is set to queue or review mode. In this state, when the cue signal recorded on the tape 6 is reproduced, this cue signal is applied to the speaker 22 and also to the low-pass filter 24. In this case, the queue signal
Assuming that it is recorded for 5 seconds at 25Hz, if the tape speed is 10 times the normal speed, the reproduced cue signal will be an audible signal of 25 x 10 = 250Hz, and the playback time will be 5/ It will be 10 seconds. Therefore, at this time, the cue signal sound from the speaker 22 is 0.5
You can hear it for seconds. The low pass filter 24
The band has been selected to pass only the 250Hz cue signal. The queue signal that has passed through the low-pass filter 24 is rectified by a rectifier circuit 25 composed of diodes D ₁ and D ₂ , a resistor R ₁ and a capacitor C ₁ , and the rectified voltage turns on the transistor Q ₁ . This causes the voltage at the point to drop, and the capacitor _C2 is instantly charged through the path of the resistor _R3 , diode _D3 , and transistor _Q1 , and this charged state is maintained. In this state, when the reproduction of the queue signal is completed, the rectified voltage disappears, so the transistor _Q1 is turned off. As a result, the voltage at the point rises to approximately the power supply voltage +B, and the voltage across the capacitor _C2 becomes compressed, and this capacitor _C2 connects from the resistor _R2 to the emitter of the transistor _Q2 ,
Discharge through the base and resistor R ₃ . This discharge current biases transistor _Q2 to turn on, which turns on transistor _Q3 . Turning on this transistor _Q3 is equivalent to closing the queue signal recording button 16, and the following operations are performed in substantially the same way as the operations at the time of recording the queue signal described above. That is, transistor Q ₃ is turned on and capacitor C ₄ is charged,
This turns on transistor _Q6 , and the voltage at the point turns on thyristor _Q7 . The voltage at the point turns on the transistor _Q9 , causing the light emitting diode _D5 to emit light. The voltage at this point is applied to transistor _Q8 via resistor R15, turning off _{transistor Q8} . As a result, the operation of the servo circuit 5 is stopped and the motor 4 is stopped. Therefore, the tape 6 temporarily stops running.

If the fast forward or rewind button is held down during this stop, capacitor C ₄ will discharge through the path of transistor Q ₆ and resistor R ₉ . This discharge path is
This is different from when recording a queue signal, and the discharge time constant is, for example, 2 seconds compared to 5 seconds when recording a queue signal.
It is chosen to be as short as seconds. When the above two seconds have elapsed, thyristor Q ₇ is turned off, and both transistors Q ₈ and Q ₉ are turned off. Accordingly, the light emitted from the light emitting diode _D5 disappears, and the servo circuit 5 is operated to rotate the motor 4, and the mode returns to the queue or review mode. The tape is then fast forwarded or rewound at high speed until the next cue signal is detected.

If the fast forward or rewind button is released during the 2 second stop time, the switch 23 is opened, cutting off the power supply voltage +B and turning off the transistors Q ₈ and Q ₉ . Therefore, as soon as the light emitted from the light emitting diode _D5 goes out, the motor 4 immediately starts rotating. At this time, since the fast-forwarding or rewinding state of the tape drive mechanism is released, the tape 6 is run at normal speed, and the tape recorder enters the playback mode. Therefore, the tape 6 is run from the position where it was once stopped upon detection of the cue signal, and immediately after that the recorded audio signal is played back.

According to the embodiment described above, if the fast forward or rewind button is held down during queue or review,
The tape 6 runs at high speed and is temporarily stopped for two seconds each time a queue signal is detected. If the fast-forward or rewind button is released while the playback is temporarily stopped at a desired position, the playback state can be immediately entered. For this reason, you only need to release your finger from the fast forward or rewind button within 2 seconds after the tape stops, making it easier to time your release, making it easier and more accurate to locate the beginning of the tape. It can be carried out. Furthermore, since it is only necessary to confirm that the tape has stopped, there is no need to pay particular attention to the signal sound of the cue signal, unlike in the past. Furthermore, since the light emitting diode _D5 lights up when the cue signal is recorded and once stopped, operation can be confirmed even more reliably. If you do not want to temporarily stop the tape 6 during queue or review, you can turn off the switch 18 and perform normal queue or review.

In this embodiment, when cueing or reviewing, the tape 6 is temporarily stopped based on the cue signal recorded on the tape 6. However, when playing back a tape on which no cue signal is recorded, the tape It is also possible to temporarily stop the system by detecting a no-signal section. That is, no-signal sections of a certain period or more are formed between musical pieces recorded on tape or between conversations, etc., and it is possible to detect these no-signal sections and operate the circuit 26. . In that case, an audio signal detection circuit should be provided in place of the low-pass filter 24, and the circuit should be configured to detect that the audio signal has disappeared for a predetermined period of time or more, and turn on the transistor _Q1 based on this detection signal. Bye.

The present invention is applicable when a high-speed running state (for example, fast forwarding or rewinding) of the recording medium is set from the playback state of the recording medium in which a position signal (including a queue signal and a no-signal section) is recorded for a predetermined length. means for detecting the position signal, means for stopping the running of the recording medium for a predetermined period of time based on the detection signal, and then returning the recording medium to the high-speed running state; and setting the high-speed running state within the predetermined time. This invention relates to a reproducing apparatus provided with means for achieving the above-mentioned reproducing state when the reproduction state is released.

Therefore, according to the present invention, it is possible to cue up signals recorded on a recording medium more easily and accurately than before.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. In addition, in the symbols used in the drawings, 4...
...Motor, 5...Servo circuit, 6...Tape, 1
9...Playback head, 23...Switch, 24...
Low-pass filter, 25... Rectifier circuit, 26...
Cue signal recording and automatic stop circuit.

Claims (1)

[Claims] 1. Means for detecting the position signal when a high speed running state of the recording medium is set from the playback state of the recording medium on which the position signal is recorded with a predetermined length, and means for detecting the position signal based on the detection signal. A regeneration device comprising means for returning the vehicle to the high-speed running state after stopping the running of the vehicle for a predetermined period of time, and means for bringing the vehicle into the regeneration state when the setting of the high-speed running state is canceled within the predetermined time.