JPH0618046B2 - Tape recorder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tape recorder having two mechanisms capable of editing and editing via a graphic equalizer.

2. Description of the Related Art Recently, tape recorders have two mechanisms, and a method of editing a recorded tape on another tape via an external graphic equalizer has been introduced.

Problems to be Solved by the Invention However, in the conventional editing via the graphic equalizer, since the output before passing through the graphic equalizer is supplied to the meter, the level actually input to the recording amplifier by operating the graphic equalizer is There was a problem that the fluctuation of the meter did not match. or,
When a tape recorded through the noise reduction circuit is edited via the graphic equalizer, a mismatch occurs in the noise reduction circuit, and there is a problem that the intended editing cannot be performed.

In view of the above problems, the present invention inputs the output after passing through the graphic equalizer to the meter circuit to match the level input to the recording amplifier with the swing of the meter, and to record the tape recorded through the noise reduction circuit. When editing via a graphic equalizer, a tape recorder that enables editing as intended by decoding with a noise reduction circuit and converting the signal to the state before passing through the noise reduction circuit is provided. .

Means for Solving the Problems In order to solve the above problems, the tape recorder of the present invention issues a command of the same logic at the time of reproduction, editing operation and editing operation via graphic equalizer, and in the recording state other than the above, The first output of the control circuit that issues a command of a logic different from is used as the encode / decode command input, and commands are issued according to the manual noise reduction command switch except during editing operations and during editing operations via the graphic equalizer, and noise reduction commands during editing operations. And a noise reduction circuit that uses the second output of the control circuit as a noise reduction command input, and a noise reduction command is added to the noise reduction circuit, and an encoding command is added, the encoded output is reduced again. When a command to cancel the command is applied, a through output is output. A recording input switching circuit that switches the input according to the third output of the control circuit that uses the input and the output of the input volume as the second input and that issues a command during editing operation via the graphic equalizer, and a noise reduction command to the noise reduction circuit. In addition, a decode output is generated when a decode command is added, and a through output is generated when a command other than the above is used. The monitor output of the noise reduction circuit is used as a first input, the output of the input volume is used as a second input, and the control circuit is used. And a meter circuit input switching circuit for switching the input according to the third output of.

Effect According to the present invention, the noise reduction command is canceled in the normal editing operation regardless of the state of the manual noise reduction switch, so that the through output appears at the recording output of the noise reduction circuit and is recorded as it is. To be done. When editing via the graphic equalizer, the noise reduction circuit operates the manual noise reduction switch,
Decode output appears on the monitor output. That is, the signal of the tape recorded through the noise reduction circuit is converted to the state before passing through the noise reduction circuit, output to the output terminal, and the frequency characteristic is changed by the graphic equalizer externally connected between the output terminal and the input terminal. It is input to the input terminal. Furthermore, the sound is recorded through the input volume and recording input switching circuit. In addition, the signal input to the input terminal is fed into the meter circuit through the meter circuit input switching circuit, and the meter swings in accordance with the recording level.

Embodiment A tape recorder according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of essential parts showing an embodiment of a tape recorder of the present invention. Reference numeral 1 is a control circuit that outputs a command of the same logic during reproduction, edit operation, and edit operation via the graphic equalizer, and outputs a logic different from the above in recording states other than the above, and during edit operation via the graphic equalizer. It has a second output for issuing a command according to the manual noise reduction command switch and for issuing a command for canceling the noise reduction command during the editing operation, and a third output for issuing a command during the editing operation via the graphic equalizer. Reference numeral 2 denotes a noise reduction circuit, which has a recording output in which a noise reduction command is added from the control circuit 1 and an encode command is added, and an encode output is added, and a command for canceling the noise reduction command is added, a through output definition is output, It has a monitor output that outputs a decode output when a reduction command is added and a decode command is added, and a through output when a command other than the above is issued. The signal 3 recorded on the tape by the first mechanism is applied to the reproduction input of the noise reduction circuit 2 through the reproduction equalizer circuit 4.

In the edit state, as described above, since the noise reduction cancel command is added from the second output of the control circuit 1 to the noise reduction circuit 2, the through output is provided as the recording output regardless of the operation of the manual noise reduction switch. Come out. Next, the signal is added to the first input of the recording input switching circuit 5, and is input to the recording equalizer circuit 6 by the command of the third output of the control circuit 1 and further input to the head of the second mechanism 7 for editing. Is performed.

Further, when editing via the graphic equalizer, a decode command and a command corresponding to the manual noise reduction switch are added to the noise reduction circuit 2, so that a decode output is output to the monitor output.
Next, the signal is input to the input terminal with an arbitrary frequency characteristic by the graphic equalizer externally connected to the output terminal and the input terminal. Further, the signal is input to the second input of the recording input switching circuit 5 through the input volume 8. This time, since the command for editing via the graphic equalizer is issued from the third output of the control circuit 1, the input of the recording input switching circuit 5 is switched and similarly applied to the recording equalizer circuit 6. Further, the output of the input volume 8 is added to the second input of the meter circuit input switching circuit 9, and the input of the meter circuit input switching circuit 9 is switched by the command of the third output of the control circuit 1 in the same manner as described above. A signal is input to 10.

As described above, according to the present embodiment, the control circuit 1 which issues the same logical command during reproduction, editing operation and editing operation via the graphic equalizer, and commands different logic from the above in recording states other than the above. The output of 1 is used as an encode / decode command input, and a command is issued according to the manual noise reduction command switch except during the editing operation and during the editing operation via the graphic equalizer, and a command for canceling the noise reduction command is issued during the editing operation. A noise reduction circuit 2 having a second output as a noise reduction command input;
When a noise reduction command is added to the noise reduction circuit 2 and an encoding command is added, an encode output is output, and when a command to cancel the noise reduction command is added, a through output is output. The recording output of the noise reduction circuit 2 is input as a first input. And a recording input switching circuit for switching the input according to the third output of the control circuit 1 which outputs the input volume 8 as the second input and issues a command during the editing operation via the graphic equalizer,
When a noise reduction command is added to the noise reduction circuit 2 and a decode command is added, a decode output is produced, and a through output is produced by a command other than the above, the monitor output of the noise reduction circuit 2 is used as a first input, and the input volume 8 Is used as a second input, and a meter circuit input switching circuit 9 for switching the input according to the third output of the control circuit 1 is provided. Therefore, the manual noise reduction switch should be operated when editing via the graphic equalizer. As a result, the tape signal recorded through the noise reduction circuit is input to the graphic equalizer in a state before passing through the noise reduction circuit, so that the recording can be performed as intended by the editor. Further, since the output of the graphic equalizer is used to swing the meter, the swing of the meter matches the recording level.

Next, FIG. 2 is a block diagram of the control circuit of FIG. A microcomputer 11 has terminals for issuing a recording / playback switching command, an editing command, and an editing command via the graphic equalizer. The encoding / decoding switching circuit 12 uses the recording / playback switching command, the editing command,
According to the editing command via the graphic equalizer, a command of the same logic is issued at the time of reproduction, an editing operation and an editing operation via the graphic equalizer, and a command of a different logic from the above is issued in a recording state other than the above. A noise reduction command circuit 13 outputs a voltage corresponding to the position of the manual noise reduction command switch. Reference numeral 14 is a noise reduction command cancellation circuit, which is used by the microcomputer 1
In accordance with the edit command No. 1, the command for canceling the command of the noise reduction command circuit 13 is issued. A noise reduction command cancellation control circuit 15 issues a command to stop the operation of the noise reduction command cancellation circuit 14 when an editing command via the graphic equalizer is applied.

As described above, the encoding / decoding switching circuit 12, the noise reduction command circuit 13, and the editing of the microcomputer 11 for issuing the encoding / decoding command in accordance with the recording / playback switching command, the editing command, and the editing command via the graphic equalizer of the microcomputer 11 are performed. A noise reduction command cancellation circuit 14 that cancels the command from the noise reduction command circuit 13 according to the command, and a noise reduction command cancellation control circuit 1 that controls the noise reduction command cancellation circuit 14 according to the editing command via the graphic equalizer of the microcomputer 11.
By providing 5, it is possible to generate the commands necessary to realize FIG.

Further, a concrete implementation of the control circuit of FIG. 2 is shown in FIG. The noise reduction command circuit 13 is composed of a manual noise reduction command switch 16 and a resistor 17. Further, the noise reduction command release circuit 14 includes a transistor 18 and a resistor 1
In FIG. 9, the noise reduction command cancellation control circuit 15 is composed of a transistor 20 and a resistor 21. In addition, the encode / decode switching circuit 12 includes transistors 22 and 23.
And the diodes 24 and 25 and the resistors 26 to 29.

The operation of the control circuit 1 configured as above will be described below.

The recording / playback switching command terminal of the microcomputer 11 is HIGH during playback and LOW during recording. It is also assumed that the edit command terminal is HIGH during the editing operation, and the edit command terminal via the graphic equalizer is HIGH during the edit via the graphic equalizer.

When the manual noise reduction circuit 16 is operated, the voltages B ₁ , B ₂ , and B ₃ are generated at the second output of the control circuit 1 through the resistor 17. Here, the first noise reduction circuit operates when the voltage is B ₁ , and the second noise reduction circuit operates when the voltage is B ₂ ,
When the voltage is B ₃ , the first and second noise reduction circuits are released. Also, the relationship between the voltages B ₁ , B ₂ and B ₃ is
It is assumed that B ₁ > B ₂ > B ₃ . Next, during the editing operation, a current flows through the resistor 19 to the base of the transistor 18, the transistor 18 is turned on, the potential of the collector becomes B ₃ , and the second output of the control circuit 1 becomes B ₃ . Next, when the editing via the graphic equalizer operates, the third output of the control circuit 1 becomes HIGH, and the base current flows through the resistor 21 to turn on the transistor 20 and prevent the transistor 18 from turning on. During editing via the equalizer, a voltage according to the operation of the manual noise reduction command switch 16 is output from the second output of the control circuit 1. Next, at the time of reproduction, the recording / reproduction switching command terminal of the microcomputer 11 becomes HIGH, the base current flows through the resistor 29, the transistor 22 is turned on, the collector current flows from the power source B ₁ through the resistor 28, and the collector potential is B. ₃
Becomes Therefore, the potential of the first output of the control circuit 1 becomes B ₃ . Next, when recording, the transistor 22 is off
Since it is in the f state, the potential of the first output of the control circuit 1 is
It becomes B ₁ . Next, in the edit state or the edit state via the graphic equalizer, the base current flows through the diode 24 or the diode 25 and the resistor 26, the transistor 23 is turned on, the collector current flows from the power source B ₁ through the resistor 28 and the resistor 27, and the control circuit 1
The potential of the first output of is B ₃ .

As described above, the potential of B ₃ is generated at the first output of the control circuit 1 at the time of reproduction, editing operation and editing via the graphic equalizer, and at the time of recording other than the above, B ₁ . In addition, the second output of the control circuit 1 has a voltage (B ₁ , B ₂ , B ₂ according to the operation of the manual noise reduction command switch) other than during the editing operation and during the editing operation via the graphic equalizer.
B ₃ ) is output, and B ₃ is forcibly output during editing operation. The third output of the control circuit 1 becomes HIGH only during the edit operation via the graphic equalizer.

As described above, according to the first embodiment of the control circuit of the present invention, a command of the same logic is issued at the time of reproduction, an edit operation, and an edit operation via a graphic equalizer, and a command of a logic different from the above is issued in a recording state other than the above. The output is used as an encode / decode command input, and a command is issued according to the manual noise reduction command switch except during the editing operation and during the editing operation via the graphic equalizer, and a command for canceling the noise reduction command is issued during the editing operation. A noise reduction circuit having an output as a noise reduction command input, and a noise reduction command added to the noise reduction circuit, and an encoding command is applied, an encode output is output, and a command for canceling the noise reduction command is applied, a through output is output. The recording output of the noise reduction circuit is the first input, the output of the input volume is the second input, A noise reduction command is added to the recording input switching circuit that switches the input according to the third output of the control circuit that issues a command during editing operation via the graphic equalizer, and a noise reduction command is added to the noise reduction circuit. Command output, the monitor output of the noise reduction circuit is used as the first input, the output of the input volume is used as the second input, and the input is switched according to the third output of the control circuit. By providing the, by operating the manual noise reduction switch during editing via the graphic equalizer, the tape signal recorded through the noise reduction circuit is converted to the state before passing through the noise reduction circuit and input to the graphic equalizer. , You can record as the editor intended.
Moreover, since the meter is shaken by the output of the graphic equalizer, the shake of the meter can be matched with the recording level.

[Brief description of drawings]

1 is a block diagram of an essential part of an embodiment of the present invention, FIG. 2 is a block diagram of the control circuit of FIG. 1, and FIG. 3 is a concrete circuit diagram of FIG. 1 ... Control circuit, 2 ... Noise reduction circuit, 3 ...
First mechanism, 4 ... Playback equalizer circuit, 5 ...
Recording input switching circuit, 6 ... Recording equalizer circuit, 7 ...
Second mechanism, 8 ... Input volume, 9 ... Meter circuit input switching circuit, 10 ... Meter circuit, 11 ... Microcomputer, 12 ... Encoding / decoding switching circuit, 13 ... Noise reduction command circuit, 14 ...... Noise reduction command release circuit, 15 ...... Noise reduction command release control circuit, 16 ...... Manual noise reduction command switch, 17, 1
9, 21, 26, 27, 28 ... Resistance, 18, 20, 2
2, 23 ... Transistor, 24, 25 ... Diode.

Claims (2)

[Claims] 1. A first mechanism which is in a reproduction state during an editing operation, a reproduction equalizer circuit which receives an output of a head included in the first mechanism as an input, and an output of the reproduction equalizer circuit which is a reproduction input, and an input Control that issues the same logical command during playback, editing operation and editing operation via graphic equalizer, and outputs a logical instruction different from the above in recording state, with the output of the input volume connected to the terminal as recording input The first output of the circuit is used as an encode / decode command input, the command is issued according to the manual noise reduction command switch during the editing operation via the graphic equalizer, and the command for canceling the noise reduction command is issued during the editing operation. A noise reduction circuit that uses the output as a noise reduction command input, and a noise reduction command to the noise reduction circuit Added, and the encoding instruction is applied encoding output, and the recording output of the noise reduction circuit through output exits the command is applied to release the noise reduction command to the first input, the output of the input volume second
And a recording equalizer circuit for switching the input according to the third output of the control circuit for issuing a command during editing operation via the graphic equalizer, a recording equalizer circuit for inputting the output of the recording input switching circuit, and the recording equalizer. When the noise reduction command is added to the head of the second mechanism that enters the recording state during the editing operation, which receives the output of the circuit as input, and the decoding command is added, the decoding output is output. A monitor output of the noise reduction circuit that outputs an output is a first input, an output of the input volume is a second input, and a meter circuit input switching circuit that switches the input according to a third output of the control circuit; An output terminal for connecting the monitor output of the reduction circuit to the graphic equalizer,
A tape recorder, comprising: a meter circuit that receives the output of the input switching circuit as an input. 2. A control circuit comprising a microcomputer and a recording / playback switching command terminal of the microcomputer.
Encoding / decoding that issues commands of the same logic during playback, during editing operations, and during editing operations via the graphic equalizer, and commands of logic different from the above in recording states other than those described above, according to commands from the edit command terminal and edit command terminal via the graphic equalizer. A switching circuit, a noise reduction command circuit that issues a command according to a manual noise reduction command switch, and a noise reduction command cancellation circuit that forcibly cancels the command of the noise reduction command circuit according to the editing command of the microcomputer,
The tape recorder according to claim 1, further comprising a noise reduction command cancellation control circuit that controls a noise reduction command cancellation circuit according to an editing command via the graphic equalizer of the microcomputer.