JPH0514358Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a magnetic recording device in which an electronic volume is provided in a line input signal path, and also includes an autofader mechanism and a timer start mechanism.

[Technical background of the invention and its problems]

The autofader mechanism is very effective for fade-in recording of line input signals, but with conventional magnetic recording devices of this type, it is easy to accidentally leave the autofader mechanism on when trying to record while you are away. and set the timer.
Even if the power is turned on at the specified time and the deck is in recording mode, the signal from the recording source will be attenuated by the electronic volume due to the fade-out mode, and recording will not be possible, resulting in a one-chance recording opportunity. It had the disadvantage of missing the point.

[Purpose of invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional device, and its object is to provide a magnetic recording device that can perform recording while the user is away even if the auto fader mechanism is turned on by mistake.

[Summary of the idea]

When the power is turned on by a timer start mechanism and the auto fader mechanism is on, the attenuation amount of the electronic volume is controlled to be zero, thereby preventing recording errors.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 and 2 are circuit block diagrams respectively showing an amplifier system circuit and a control circuit of a device to which a magnetic recording device according to the present invention is applied.

In Figure 1, 1 is a line input terminal, 2 is a buffer amplifier that receives the signal from line input terminal 1, 3 is a volume for adjusting the level of the source signal, 4 is a flat amplifier, 5 is a source side electronic volume, and 6 is a It is an electronic switch.

7 is the regeneration (PB) head of the regeneration (PB) deck;
8 is the recording/playback (R/P) deck's recording/playback (R/P) deck.
P) Heads 9 and 9' are playback EQ amplifiers that equalize and amplify the playback signals from the PB head 7 and R/P head 8, 10 is a changeover switch that selects the output of one of the playback EQ amplifiers 9 and 9', and 11 12 is a volume for adjusting the level of the reproduction signal, 13 is a flat amplifier, 14 is an electronic volume on the tape side, and 15 is an electronic switch.

A mixing amplifier 16 mixes the outputs of the flat amplifiers 5 and 14, and the output of this amplifier is output from a line output terminal 17 and is applied to a level check meter 18.

19 is a recording side noise reduction circuit into which the output of the mixing amplifier 16 is input; 20 is a changeover switch for selecting the output of the playback side and recording side noise reduction circuits 11 and 19; and 21 is a changeover switch for selecting the output of the recording side noise reduction circuit 11 and 19; Volume to adjust level, 22
is the recording EQ amplifier, 23 is the bias oscillator, 24
2 is a variable resistor for adjusting the level of the bias signal, and 25 is an electronic switch for switching the R/P head.

26 is a headphone amplifier, and a changeover switch 27
1 of the outputs of the buffer amplifier 2, mixing amplifier 16, and reproduction side noise reduction circuit 11 selected in
One is output from the headphone output terminal 28.

_M1 is a muting transistor for line input cutting during double-speed copying, _M2 is a muting transistor for line output cutting, _M3 is a recording mutating transistor, and _M4 is a switching transistor for turning on/off the bias oscillator 23. , transistors _M1 to _M4 are controlled by outputs A to D of the control circuit shown in FIG.

Further, the electronic switches 6 and 15 are controlled by the outputs E and F of the control circuit to switch the changeover switches 10 and 2.
0 and 25 are respectively controlled by the outputs G to I of the control circuit, and in particular, the switch 20 is controlled so that the flat output of the noise reduction circuit 11 is directly input to the recording EQ amplifier 22 during double-speed copying.

The electronic volumes 5 and 14 are controlled by outputs J and K of the control circuit, respectively.

The selector switch 27 is used to select the input of the headphone amplifier 26 from each of the electronic volumes 5 and 14 and the front stage of the level meter 18, so that it can be used on the monitor even when the electronic volumes 5 and 14 are closed, and the position can be changed. Position a and c monitor the source output and tape output, respectively, and position b allows you to monitor the same content as line output.

On the other hand, in FIG. 2, the control circuit 30
In that input, PB deck operation switch S ₁ ,
R/P deck operation switch _S2 , accidental erasure prevention switch _S3 , PB deck end detection circuit 31, R/P deck end detection circuit 32, double speed copy switch _S4 , one of two fade on/off switches _S5a , source In switch S ₆ , fade out switch
S ₇ , tape-in switch S ₈ , timer switch S ₉
are connected. The other of the fade-on/off switches _S5b is connected between the fade-on indicator _I1 and the power supply _Vcc .

When the fade on/off switches S _5a and S _5b are off, the electronic switches 6 and 15 are held in the illustrated state by the outputs E and F of the control circuit 30, and the electronic volumes 5 and 14 are bypassed. , fade on/off switch S _5a , S _5b
When on, the electronic switches 6, 15 are switched by the outputs E, F of the control circuit 30 in the opposite state to that shown, and the electronic volumes 5, 14 are inserted into the signal path.

In addition to the above outputs A to I, the control circuit 30 includes a PB deck mechanism section, an R/P deck mechanism section,
PB, R/P deck operation mode indicator, constant speed circuit switching control outputs _O1 to _O4 ,
and fade-out, source-in, and tape-in ON outputs _O5 to _O7 , and electronic volume control outputs J and K are connected to capacitors C and C', amplifiers 33 and 33', diodes D and D', and resistor R. ₁ ～
They are generated by outputs O ₆ and O ₇ through respective circuits from R ₄ and R ₁ ′ to R ₄ ′.

Note that _I2 to _I5 are indicators for displaying double speed on, fade out on, source in on, and tape in on.

In the above configuration, when the fade on/off switches S _5a and S _5b are on the off side, the electronic switches 6 and 15 are on the bypass side, so the movements of the electronic volumes 5 and 14 are completely irrelevant. Therefore, only the case where the fade on/off switches S _5a and S _5b are on will be described.

First, after turning on the power, turn on the fade on/off switch.
When S _5a and S _5b are turned on, the fade out output O ₅ of the control circuit 30 rises from the L level to the H level as shown in FIG. 3a, and the indicator I ₃ lights up to indicate the fade out mode. . At this time, as shown in FIGS. 3b and 3c, the source-in and tape-in outputs _O6 and _O7 of the control circuit 30 are at L level, and the capacitors C and
C' is in a discharged state and the outputs of amplifiers 33 and 33' are at negative potential, so as shown in Fig. 3 d and e.
Electronic volume control output J as shown in
and K become a negative potential determined by resistors R ₁ to _{R 4} , R ₁ ′ to _{R 4} ′ and diodes D and D′, and the electronic volumes 5 and 14 have the maximum attenuation and the signal is constricted. There is.

After that, when the R or PB operation is performed, the R/P deck is changed from the stop state to the R or PB state as shown in FIG. 3f, and then when the source-in switch _S6 is turned on, the source-in output _O6 of the control circuit 30 goes low as shown in FIG. 3b.
The inverter turns on the indicator _I4 and charges the capacitor C. The charging of the capacitor C causes the amplifier 33
The output of gradually becomes positive, the electronic volume control output changes as shown in FIG. 3d, the attenuation of the electronic volume 5 gradually becomes zero, the signal from the electronic volume 5 becomes large, and it automatically fades in.

Although not shown in Fig. 3, when the tape-in switch _S8 is turned on in the above-mentioned state, the tape output gradually increases and the source-in signal is gradually tightened by the electronic volume 5, resulting in a so-called autocross. A fade is performed.

Further, when the fade-out switch _S7 is turned on, the attenuation amount of the electronic volume 5 or 14 is gradually increased, and an auto-fade-out is performed in which the line input signal and tape output signal are gradually attenuated.

In the above-mentioned operation, the power is turned on manually, but a case will be described in which this is automatically done with a timer and used for recording when the user is away from home using an R/P deck, or for playback as an alarm clock, for example.

There are two ways to control the electronic volumes 5 and 14 after the power is turned on using a timer: one is to control one electronic volume depending on the position of the timer switch, and the other is to control both electronic volumes regardless of the position of the timer switch. It will be done.

In the former method, when the timer switch _S9 is in the recording (R) position, the source-in output _O6 of the control circuit 30 changes from L to H level after a certain period of time _T1 after the power is turned on, as shown in FIG. 4b. At the same time, as shown in Fig. 4f, R/P
The deck is switched from stop to recording state. Also,
The control output J for the electronic volume 5 then becomes 0 after a certain period of time _T2 , as shown in Figure 4d.
Since the attenuation amount of electronic volume 5 is zero, the signal from line input terminal 1 is
The signal is input to the recording amplifier 22 at the L level set by the switch 25, and then applied to the R/P head 8 via the switch 25 to perform recording.

When the timer switch _S9 is in the playback (PB) position, the
After T ₁ , the control circuit 3 as shown in Figure 4c
The tape-in output _O7 of 0 is changed from L to H level, and the R/P deck is changed from the stop state to the playback state as shown in FIG. 4f. Further, the control output K for the electronic volume 14 becomes 0 after a certain period of time _T2 , as shown in FIG. 4e.
Since the attenuation amount of the electronic volume 14 is zero,
The reproduction signal from the R/P deck is sent to the mixing amplifier 16 at the level set by the volume 12.
and is output from the line output terminal 17.

In this case, the amplifier function is in tuner position, so even if a signal is received, it will not be mixed with the tape sound.

When switch S ₉ is in the off position, both source-in and tape-in outputs O ₆ and O ₇ change from L to H.
level and ensure that the signal is audible.

In the latter method, the output of a control circuit related to the autofader is changed from L to H level, and both outputs J and K are set to 0 after a time T ₁ +T ₂ after the power is turned on. Therefore, the attenuation amount of both electronic volumes is made zero, and the signal is not suppressed.

The operations described above are realized by the work performed by the microcomputer constituting the control circuit according to a predetermined program, and a float chart thereof is illustrated in FIG.

In the above-mentioned embodiment, fade-in recording is performed when the power is turned on by the timer to record when the user is away, but if fade-in recording is not necessary, the following may be used.

In other words, the two locking type fade on/off switches S _5a and S _5b are replaced with one non-locking type, and when the power is turned off when setting the timer, the fade on/off switch is automatically activated.
The onset state caused by S _5a is canceled or the set state is automatically canceled when the power is turned on, and when the timer is started, the control circuit 30 bypasses the electronic volumes 5 and 14 using switches 6 and 15. switch to the side so that the sound is not cut off. In this case, fade-on/off indication is performed by providing a dedicated output terminal of the control circuit.

With the device of the embodiment described above, there is no possibility that no sound will be produced during timer recording, i.e., recording while the user is away, or timer playback, i.e., alarm playback. Recording and playback will not be impossible, and the inconvenience caused by the auto fader mechanism will be eliminated.

In addition, by leaving all electronic volumes in a state where they are not closed when the power is turned on, not only when the timer is started but also during normal operation, it is the same as turning off the fader on/off switch, so there is no strange feeling. At this time, by lighting two indicators, it is possible to display that the power is not turned on but the fader switches are not being operated, thereby informing the user that it is a special mode, which can be useful for the next operation.

[Effect of idea]

As explained above, according to the present invention, even if the auto fader mechanism is on, when the power is turned on by the timer start mechanism, the attenuation amount of the electronic volume is set to zero, so when the timer starts, the attenuation amount of the electronic volume is set to zero. It is possible to pass the signal without fail, and it is possible to prevent recording errors caused by the conventional auto fader mechanism being turned on.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram of an amplifier system circuit of a device according to an embodiment of the present invention, Fig. 2 is a circuit block diagram of a control circuit of the same device, and Figs. 3 and 4 explain the operation of the same device. FIG. 5 is a flowchart illustrating the operation of the control circuit in FIG. 2. FIG. 5...Electronic volume, 30...Control circuit, _S5a , _S5b ...Feeder on/off switch, _S9 ...Timer switch.

Claims (1)

[Claims for Utility Model Registration] In a magnetic recording device that is provided with an electronic volume in the line input signal path and also has an auto fader mechanism and a timer start mechanism, the power is turned on by the timer start mechanism, and the auto fader mechanism is in an on state. 1. A magnetic recording apparatus characterized by comprising a control means for controlling an attenuation amount of the electronic volume to zero when the electronic volume is in the position.