KR920001128B1 - Recording circuit for audio apparatus - Google Patents

Abstract

The compact disk player is operated backwards for a time 1 which is the sum of running times of tape including start unrecorded and end unrecorded region so that the music is continued without missing. The circuit includes a first switching unit (1) supplied with power through a record contact (R) or record/reproduce switch, a first driver unit (5) for sending a synchronous record signal to a microcomputer, a second driver unit (5) for sending auto reverse signal to the microcomputer to reverse the compact disk player, a second switch (3) supplied with power through a reproducing contact of the recording/reproducing selection switch; when tape running is stopped, and a third driver unit (5) for sending stop signal to the compact disk player according to output pulse of the second switch unit (3).

Description

Recording circuit of hybrid audio equipment

1 is an exemplary circuit diagram of the present invention.

FIG. 2 is a flow chart of function according to whether or not an automatic reversal mode of the microcomputer of FIG.

* Explanation of symbols for the main parts of the drawings

SW1: Function Selection Switch SW2: Recording / Playback Switch

SW3: Leaf Switch for Tape Reverse Detection

Q1-Q6: Transistor R1-R7: Resistance

D: Diode C: Capacitor

1,3: switching unit 2: microcomputer

4: Stop key signal input terminal of compact disc

5,5´, 5˝: Drive part

The present invention provides a composite audio device including a compact disc player and an automatic reversal type cassette tape recorder, wherein the cassette tape recorder has an automatic reverse function when recording a compact disc signal on a cassette tape. The present invention relates to a recording circuit which prevents recording error with a compact disc signal caused by the present invention.

In a conventional hybrid audio device with a compact disc player, when recording a compact disc signal on a cassette tape, the compact disc is operated first and then the cassette tape deck is operated to perform recording, or only the cassette tape deck is recorded. Switching to the position allows compact discs to operate simultaneously.

However, in the case of a hybrid audio device having a cassette tape deck with an automatic reverse function, even if the compact disc continues to operate, the cassette deck may stop after recording only one side or after the recording is finished by the automatic reverse function. When switching to the recording on the back side, there is a disadvantage that recording errors with the compact disc signal are not recorded in the non-recordable part of the tape end.

An object of the present invention is to detect the automatic reverse state of the tape in order to solve this disadvantage, thereby reversing the operation of the compact disc by a set time considering the running time of the tape end and the non-recordable portion at the beginning of the tape. It is possible to prevent recording error with the compact disc signal, and the compact reverse auto reverse and auto stop function for simultaneous recording of the front and back of the tape of the compact disc signal is performed in series for convenient audio system. As to provide a recording circuit, the configuration and effect of the present invention will be described in detail by the accompanying drawings.

1 is a circuit diagram of an embodiment of the present invention, in a composite audio apparatus including a compact disc player and a cassette tape recorder having an automatic reverse function, when dubbing recording of a compact disc signal to a cassette tape, a function selection switch ( The switching output of the first switching unit 1, which is supplied with driving power through the recording contact R of the switch SW1 and the recording / playback switching switch SW2, is applied to the first driving unit 5 so that the microcomputer 2 is simultaneously operated. The recording function is performed, and the switching output of the first switching unit 1 is also applied to the second driving unit 5 'through the automatic reverse sensing life switch SW3 of the tape so that the microcomputer 2 Performs the search function to find the playback position of the compact disc when the compact disc playback time is subtracted from the specified count time (X) while performing the automatic reverse function of the compact disc. The pulse output of the second switching unit 3, which is supplied with driving power through the reproducing contact P of the recording / playback switching switch SW2 at the time of stop, is applied to the third driving unit 5˝ to stop key signals of the compact disc. It is configured to supply.

In an embodiment of the present invention, the first switching unit 1 is an interlocking switching transistor supplied with a bias voltage through the recording contact R of the function selection switch SW1 and the recording / playback switching switch SW2. A switching transistor (Q1) (Q2) and the bias resistor (R1-R3), the second switching unit 3 is supplied with a bias voltage through the regenerative contact (P) of the recording / reproduction switching switch (SW2) ( Q5) and a base bias resistor (R6), a diode (D) connected in series between the base and the ground of the switching transistor (Q5) and a capacitor (C) for setting the operating time of the switching transistor (Q5), the first And second and third driving units 5, 5 'and 5' are operated and controlled by the outputs of the first switching unit 1 and the second switching unit 3, respectively. 2) automatic reverse signal input terminal (P2), simultaneous recording signal input terminal (P1), and compact key stop key signal Switch transistors Q3, Q4, Q5 and bias resistors R5, R4, and R7 connected to the input terminal 4, respectively.

On the other hand, the specific setting time (X) set in the microcomputer 2 is the search of the compact disc at the sum of the time required for reciprocating the non-recordable portion of the tape end and the time required for switching the tape deck. It is determined by subtracting the time required for execution.

Vcc in the figure is DC power.

To record the compact disc signal on the tape, first switch the function selector switch (SW1) to the compact disc function position and the tape deck to the recording position. The record / playback switch (SW2) automatically switches to the recording contact (R) position. .

As a result, the transistor Q2 in the first switching unit 1 is "turned on" by the bias voltage supply through the resistor R3, and thus the transistor Q1 is also "turned on", and thus the transistor Q2 is turned on. The Vcc switching voltage is supplied to the driver 5 to "turn on" transistor Q3. Therefore, since the simultaneous recording signal input terminal P1 of the microcomputer 2 is connected to the ground to the "low" level, the microcomputer 2 simultaneously operates the compact disc and the cassette tape to perform the recording function.

When one side of the tape is finished while the recording function is performed as described above, the tape deck reverses the driving direction of the tape to record on the back side of the tape. In this case, the life switch SW3 is “on” and the first switching unit ( The switching output of 1) is supplied to the second driver 5 'so that the transistor Q4 is "turned on". Therefore, since the automatic reversing signal input terminal P2 of the microcomputer 2 is connected to ground to be at the "low" level, the microcomputer 2 performs the automatic reversing function of the compact disc and sets the schedule as shown in FIG. The search function is performed during the time (X). That is, the above setting time (X) is set to a value obtained by subtracting the time required for reciprocating the non-recordable portion of the tape end with the time required for the tape deck to switch driving, and subtracting the search execution time of the compact disc player. However, the compact disc player returns to the playback position after subtracting this setting time (X) from the counted compact disc playback times so far, and then the playback function is resumed, resulting in recording error caused by the tape's automatic reverse function. Will be prevented.

On the other hand, after the recording of the front and back of the tape is completed, the tape tech is automatically stopped, at which time the recording / playback switching switch SW2 is switched to the playback contact point P position. Therefore, all the transistors Q1 and Q2 in the first switching unit 1 are all “off,” thereby turning off the transistors Q3 and Q4 in the respective driving units 5 and 5 '. The ground potential supplied to each terminal P1 and P2 of (2) is cut off, and the automatic reverse simultaneous recording function performed by the microcomputer 2 is also stopped.

On the other hand, the transistor Q5 in the second switching unit 3 is turned on by the base bias current flowing through the condenser C from the Vcc power input through the regeneration contact P of the recording / playback switching switch SW2. "do.

Accordingly, the transistor Q6 in the third driving section 5 'is also " turned on " so that the compact disc stop key signal input terminal 4 is connected to ground during the charging time of the condenser C, so that the terminal 4 is finally turned off. Through the input of a negative pulse, the compact disc player also stops operating.

As described above, the present invention can prevent the recording error between the compact disc and the dubbing of the cassette tape, and of course, the dubbing operation is convenient because the recording is performed on the front and back sides of the tape.

Claims (3)

In a hybrid audio apparatus including a compact esc player, a cassette tape recorder having an auto-reversing function, and a microcontroller (2), which is a system controller, a function selection switch (SW1) for dubbing recording of a compact disc signal to a cassette tape; The first switching unit 1 receives the driving power through the recording contact R of the recording / playback switching switch SW2, and is controlled by the switching output of the first switching unit 1 to the microcomputer 2. The microcomputer 2 is controlled by the switching output of the first driving unit 5 for inputting the simultaneous recording signal and the first switching unit 1 input through the tape automatic reversing detection switch SW3. A second driving unit 5 for inputting an automatic reverse signal of a compact disc, and a second switching unit receiving driving power through a reproducing contact P of the recording / playback switching switch SW2 when the tape is automatically stopped. 3) and And a third drive section (5 ') which is drive controlled by the output pulse of the second switching section (3) and supplies a stop key signal of the compact disc, from the second drive section (5) to the microcomputer (2). When inputting the auto-reversal signal of the compact disc, the microcomputer 2 performs the auto-reversal function and finds the playback position of the compact disc at the time point minus the preset time (X) from the counted compact disc playback time. Recording circuit of a hybrid audio device, characterized in that to perform the search function. The interlocking switching transistor of claim 1, wherein the first switching unit 1 receives a bias voltage through a recording contact R of the function selection switch SW1 and the recording / playback switching switch SW2. A switching transistor comprising Q1) (Q2) and bias resistors R1-R3, wherein the second switching unit 2 is supplied with a bias voltage through the regeneration contact P of the recording / playback switching switch SW2. (Q5), the base bias resistor (R6), the switching transistor (Q5) and the diode (D) and the recording time of the switching transistor (Q5) of the condenser (C) for the recording of the composite audio device Circuit. The time required for performing a search of a compact disc according to claim 1, wherein the set time (X) is a value obtained by reciprocating the non-recordable portion at the end of the tape and the time required for switching the tape deck. The recording circuit of the hybrid audio device, characterized in that the value is set to the subtracted.

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