KR910004225Y1 - Muting circuit for the interval between musics on disk - Google Patents

Abstract

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Description

Muting circuit between songs on the disc

1 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

11: reproduction amplifier 12: head

13: recording and playback amplifier 14: main amplifier

15: Automatic Music Program Sensor 16: Motor

17: magnet R1-R9: resistance

C1, C2: Capacitor D1-D4: Diode

Q1-Q2: Transistor VR: Variable resistor

SW1: Mode selector switch LS1: First leaf switch

LS2: Second Leaf Switch

The present invention relates to an audio system having a turn table and a tape recorder. In particular, a tape recorder and a function of detecting a track and a song of a disk played by the turn table are provided. When used in conjunction with the circuit to reduce the noise (noise) generated between the song on the disc.

Typically audio systems with turntables and tape recorders used Automatic Music Program Sensors (AMPS) only on tape recorders and not on turntables.

Therefore, the noise between the songs on the disc played by the turntable, that is, low frequency hum and high frequency white noise, is generated. There was a problem that can be remarkably felt complaints of users.

Accordingly, an object of the present invention is to provide a circuit capable of reducing noise between songs on a disc reproduced by a turntable by applying AMPS used in a tape recorder.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a circuit diagram of the present invention, in which a mode selection switch SW1 for selecting a turntable, a tape recorder or a radio mode according to a listener's selection, and a first power source B + by the mode selection switch SW1. A reproduction amplifier 11 for amplifying and outputting a voice signal input from a pickup, a head 12 for recording a voice signal on a tape or reading a voice signal recorded on a tape, and the head 12. The recording and reproducing amplifier 13 for amplifying the audio signal recorded or reproduced through the amplification and the output of the reproducing amplifier 11 or the recording and reproducing amplifier 13 are amplified by the non-inverting terminal and output through the speaker SP. Output of the regenerative amplifier 11 by the main amplifier 14 to which a signal is also input as an inverting terminal in the table mode and a first power source B + applied from the mode selection switch SW1 when the turn table mode is selected. To a certain level A first means composed of a resistor R1 and a diode D1 for raising and transmitting in one direction to the main amplifier 14, and a first power source applied from the mode selection switch SW1 when a tape recorder mode is selected. A second means consisting of a resistor R2 and a diode D2 for raising the output of the recording / reproducing amplifier 13 to a predetermined level by one (B +) and transmitting it in one direction to the main amplifier 14, and a turntable operation The reproducing amplifier 11 or the recording / reproducing from the first or second means by the first power source B + applied from the mode selection switch SW1 through the diodes D3 and D4 during the operation of the Cina tape recorder. A signal is input to the main amplifier inverting terminal according to the AMPS 15 generating a voice presence signal by inputting the output of the amplifier 13 and generating a voice presence signal, and the presence or absence detection signal of the AMPS 15 during turn table operation. Between the songs Regenerative amplifier control means consisting of resistors (R4, R8, R9) and transistors (Q2) for controlling mutable negative feedback, a motor (16) for driving the tape, fast selected during fast forward or rewind operation The magnet 17 for resetting the forward button or the rewind button, and the first lift switch LS1 for supplying the first power to the motor 15 when the external play button and the recording button, the rewind button, and the fast word button are selected. And a second leaf switch LS2 for supplying the first power B + from the first leaf switch LS1 to the magnet 17 when an external fast forward and recording button is selected. In order to drive the magnet 17 according to the voice presence detection signal, it consists of a magnet driving means composed of a transistor Q1 and a resistor R6.

The present invention will be described in detail based on the above-described configuration.

First, the listener operates the mode selector switch SW1 to select the tape recorder mode, and then operates the tape recorder. Then, the first power source (the first power source (supply power supply) through the line 1 from the contact of the mode selector switch SW1 is selected. The recording and reproducing amplifier 13 supplied with and operated by B +) inputs and amplifies the audio signal through the line 2 from the head 12 for reading the audio signal recorded on the tape, and then outputs it to the second means. do.

The second means for inputting the output of the recording / reproducing amplifier 13 raises the output of the recording / reproducing amplifier 13 to a predetermined level by the first power source B + applied through the line 1, thereby providing a one-way diode ( Output to line 3 through D2), resistor R2 is used for biasing and diode D2 blocks signal inflow on line 3.

Then, the main amplifier 14 amplifies the audio signal on the line 3 through the variable resistor VR and outputs it to the speaker SP through the capacitor C2 so that humans can hear it. At this time, the diode D3 is output through the resistor voltage dividers R3 and R5 supplied with the first power B + on the line 1. The AMPS 15 checks whether there is a voice signal during the output of the recording / reproducing amplifier 13, and outputs a voice logic presence / absence detection signal in the low logic state to the line 4 while the voice signal is present, thereby resisting the magnet drive means. Transistor Q1 is turned off via R6.

Then, when the recording or fast forward button is selected, the first power B + is supplied to the second lift switch LS2 through the first lift switch LS1, so that the motor is turned on. Run the tape at high speed. After the end of the song, the AMPS 15 is delayed by a time constant R7 and C1 by the resistor R7 and the capacitor C1 for adjusting the detection time of the AMPS 15. The audio presence detection signal of is outputted to the line 4. The magnet driving means for inputting the voice presence detection signal through the line 4 grounds the magnet 17 by the transistor Q1 turned on through the resistor R6 when the voice presence detection signal in the high logic state is input. By operating the magnet 17 by forming a current path of the magnet (17). Therefore, when the magnet 17 returns the fast forward or recording button when the current path is formed, the second leaf switch LS2 is turned off to stop the operation of the motor 16 and proceeds to the next music. In addition, when the turntable mode is selected by operating the mode selector switch SW1 and then the turntable is operated, the first power source B +, which is the supply power supply, is supplied through the line 5 from the contact point of the mode selector switch SW1. The regenerative amplifier 11 inputs and amplifies the audio signal from the pick-up of the turn table via the line 6 and outputs it to the first means. The first means for inputting the output of the regenerative amplifier 11 raises the output of the regenerative amplifier 11 to a predetermined level by the first power source B + applied through the line 5 so as to provide a one-way diode D1. Is output to line 3, resistor R1 is used for biasing and diode D1 blocks signal inflow on line 3.

Then, the main amplifier 14, which amplifies and outputs a predetermined level by the first power source B + applied through the line 7, amplifies the audio signal on the line 3 through the variable resistor VR, thereby causing the speaker SP. ) So that people can listen. At this time, the AMPS 17, which receives the first power B + on the line 5 through the diode D4, outputs the output of the regenerative amplifier 11 output on the line 3 to the resistor voltage divider R3 and R5. By inputting through), it is checked whether there is a voice signal during the output of the reproducing amplifier 11, so that the voice presence detection signal in a low logic state is output to the line 4 while the voice signal is present. When the voice state detection signal in the low state ends and goes high, a predetermined delay is performed by time constants R7 and C1 for adjusting the detection time of the AMPS 15. After the predetermined delay, the main amplifier control means for inputting a voice presence detection signal through the line 4 controls a negative feedback that is input through a bias resistor R4 by inputting a voice presence detection signal having a high logic state. The main amplifier 14 is inverted by the transistor Q2.

A current adjusting resistor R9 is connected to the collector terminal of the line 5 and the transistor Q2, and a negative feedback resistor R8 is connected to the main amplifier inverting terminal to be input to the inverting terminal of the main amplifier 14. Mutes between songs by the signal. Therefore, even in turntable mode, you can find the gap between the song and the song on the disc and remove the error noise generated between the song and the song.

As described above, the ability to detect the tracks and songs of the disc played by the turntable can be used at low cost by melting the tape recorder's detection function, and muting the disc free time generated between the songs and the songs. There is an advantage in that noise can be reduced.

Claims (1)

The voice inputted from the pickup by receiving the first power source B + by the mode selection switch SW1 and the mode selection switch SW1 for selecting a turntable, a tape recorder or a radio mode according to the listener's selection. A reproducing amplifier 11 for amplifying and outputting a signal, a head 12 for recording a voice signal on a tape or reading a voice signal recorded on a tape, and amplifying a voice signal recorded or reproduced through the head 12 The recording and reproducing amplifier 13 and the output of the reproducing amplifier 11 and the recording and reproducing amplifier 13 are amplified by the non-inverting terminal and output through the speaker SP. A first means for raising the output of the regenerative amplifier 11 to a predetermined level by the input main amplifier 14 and the first power source B +, and for unidirectional transmission to the main amplifier 14, and a tape recorder When selecting the more mode Second means for raising the output of the recording / reproducing amplifier 13 to a predetermined level by a first power source B + applied from the mode selection switch SW1 and transferring the output signal to the main amplifier 14 in one direction; Input of the output of the reproduction amplifier 11 or the recording reproduction amplifier 13 from the first and second means by the first power source B + applied from the mode selection switch SW1 during the operation or during the tape recorder operation. By detecting the presence or absence of a voice signal, the AMPS 15 generating a voice signal, the motor 16 for driving the tape, and a magnet for resetting the selected fast forward button or recording button during fast forward or recording operation. 17) a first leaf switch LS1 for supplying a first power B + to the motor 15 at the time of selecting an external play button and a recording button, a rewind button and a fast forward button, an external fast forward and When the coding button is selected, the second leaf switch LS2 inputs the first power B + from the first leaf switch LS1 to the magnet 17 and the voice presence detection signal of the AMPS 15. In the audio system having a magnet driving means for driving the magnet 17, a signal is applied to the inverting terminal of the main amplifier 14 according to the voice presence detection signal of the AMPS 15 during turn table operation. Muting circuit between the song and the song of the disc characterized in that it consists of a regenerative amplifier control means for controlling the negative feedback that can mute between the song and the song.