KR0164777B1 - Compact disc rom drive circuit - Google Patents

Abstract

The present invention synthesizes and outputs an external audio signal and an internal audio signal in a system embedded compact disc ROM drive circuit.

To do this, the compact disc ROM drive circuit is provided with an input terminal which is arranged at the rear side and can be connected to an output terminal of an external audio device, an output terminal which is located at the front side and can be connected with a speaker, and reproduces data recorded on a compact disc. Means for mixing the audio signal received from the input terminal and the audio signal output from the reproduction means, and means for adjusting the volume of the audio signal output from the mixing means and applying it to the output terminal.

Therefore, the compact disc ROM drive circuit of the present invention can synthesize the external audio signal and the internal audio signal in itself and adjust the volume at the same time.

Description

Compact disc ROM drive circuit

1 is a block diagram of a conventional compact disc ROM drive circuit.

2 is a block diagram of a compact disc ROM drive circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

101, 102: output terminal 103: input terminal

111: RF amplifier 112: signal processor

113: D / A converter 114: playback filter

115: amplifying unit 116: adjusting unit

117: synthesis section

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc ROM drive circuit. In particular, the rear surface of the system-integrated compact disc ROM drive circuit includes an input terminal for receiving an external audio signal, and synthesizes the playback signal and the external audio signal of the compact disc. It relates to a circuit that can be output to the output terminal of.

In general, a compact disc ROM drive circuit is built into a system such as a computer to perform a function of reproducing information recorded on a compact disc. The compact disc may include a compact disc ROM used as an auxiliary storage device of a computer, and a compact disc digital audio for digitally recording an audio signal. The compact disc ROM drive circuit for reproducing such a compact disc is mounted inside a system such as a computer in the form of a card.

FIG. 1 is a configuration diagram of a conventional compact disc ROM drive circuit, and a second output terminal 102 and an interface (interface commector, power connector, etc.) for outputting an audio signal reproduced to the outside from the rear surface of a compact disc drive circuit of a built-in type. In this case, a first output terminal 101 for listening to a reproduced audio signal through a headphone or a speaker is disposed on the front surface. The compact disc reproducing means includes an RF amplifier 111 for amplifying the electrical signal converted by the pickup device, a signal processor 112 for receiving an output of the RF amplifier 111 and correcting an error and restoring the original signal; A D / A converter 113 for receiving an output of 112 and converting an analog audio signal, and a reconstruction filter 114 for receiving high frequency noise from the output of the D / A converter 114. In addition, the signal control means is an amplifying unit 115 for receiving and amplifying the output of the reproduction filter 114, and an adjusting unit for controlling the reproduction audio signal connected between the amplifying unit 115 and the first output terminal 101 to output the amplifying unit 115 ( volum) 116.

The process of reproducing the audio signal recorded on the compact disc in the compact disc ROM drive circuit having the configuration as shown in FIG. 1 will be described. It should be noted that the reproducing means in the configuration of FIG. 1 only shows a configuration for reproducing the audio signal recorded on the compact disc. First, the pickup device converts the audio signal recorded on the disc into an electrical signal, and the RF amplifier 111 amplifies the weak electrical signal. Then, the signal processor 112 performs an error correction function in units of blocks by analyzing the states of the parit bits assigned in units of blocks during recording, and decodes and restores the coded data in the form of original data during recording. The signal processor 112 is a digital signal processor. The digital audio data output from the signal processor 112 is converted into an analog audio signal through the D / A converter 113, and the reproduction filter 114 removes the high frequency components included in the analog audio signal to filter the audio signal of good quality. . The output of the regeneration filter 114 is applied to the second output terminal 102 located at the back and to the amplifier 115. Then, the amplifying unit 115 amplifies it again, and the adjusting unit 116 outputs the amplified audio signal to the first output terminal 101 located in the front. In this case, an external audio device is typically connected to the second output terminal 102, and a headphone or a speaker is connected to the first output terminal 101.

As described above, the compact disc ROM drive circuit includes two output terminals including a first output terminal 101 for connecting headphones and a second output terminal 102 which is a line out terminal. The first output terminal 101 allows a user to listen to audio using a headphone or connect a speaker to hear an audio signal, and the front output terminal 101 can easily attach or detach a headphone or a speaker to the system. In addition, the second output terminal 102 is a terminal for connecting the audio signal of the compact disc reproduced as described above to an external audio device.

For example, a sound card used in a computer has an output function of an audio signal according to its own function, and its output terminal is located at the rear of the computer.

At this time, most sound cards receive signals from other audio devices and mix them with their own audio signals, thereby achieving unification of audio signal output.

Thus, in most applications, the second output terminal 102 of the compact disc ROM drive is connected to the input terminal of the sound card. Therefore, if you want to connect an external audio device to the compact disc ROM drive circuit, you should plug headphones or speakers into the back of the computer, and if you want to adjust the volume, you must adjust the volume located on the back of the computer.

In other words, if you want to attach or detach the headphones or speakers or manually to adjust the volume, there was an inconvenience of having to perform the operation by putting the hand of the sound card volume and the headphone output terminal into the back of the computer protruding.

Accordingly, an object of the present invention is to include an input terminal for receiving a signal of an external audio device on a rear surface of a compact disc ROM drive circuit, and to synthesize a play signal and an external audio signal of a compact disc and output the output signal to the front output terminal. In providing a circuit.

In order to achieve the above object of the present invention, the present invention is a system built-in compact disc ROM drive circuit, an input terminal for receiving an audio signal generated by an external audio device disposed on the rear of the circuit and disposed on the front of the circuit; And an output terminal, means for reproducing the data recorded on the compact disc, and means for synthesizing the external audio signal received from the input terminal with the audio signal of the reproducing means and applying it to the output terminal.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same parts in the figures represent the same reference signs wherever possible.

Many specific details are set forth in the following description in order to provide a more thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

2 is a configuration diagram of a compact disc ROM drive circuit according to the present invention, and includes a second output terminal 102 and an interface (interface connector, power connector) for outputting the reproduced audio signal to the outside of the compact disc drive circuit of the built-in type. ), And an input terminal 103 for receiving an audio signal generated from an external audio device. Also, a first output terminal 101 for disposing a reproduced audio signal through a headphone or a speaker is disposed in front. The reproducing means of the compact disc includes: an RF amplifier 111 for amplifying the electrical signal converted by the pickup device, a signal processor 112 for receiving an output of the RF amplifier 111 and correcting an error and restoring the original signal; A D / A converter 113 for receiving the output of the processing unit 112 and converting it into an analog audio signal, and a reconstruction filter 114 for receiving and filtering the output of the D / A converter 114. The mixing unit 117 synthesizes the external audio signal received from the input terminal 103 and the internal audio signal to be reproduced. In addition, the signal control unit is an amplifying unit 115 for receiving and amplifying the synthesized signal, and an adjusting unit for controlling the volume of the reproduction audio signal output between the amplifying unit 115 and the first output terminal 101 to output the amplifying unit 115 (volum 116).

Referring to the operation of the present invention based on the above configuration, the operation of reproducing the data recorded on the compact disc is the same as the operation in FIG.

The input terminal 103 is located at the rear side, and when an output terminal of an external audio device is connected to the input terminal 103, an external audio signal is applied to the inside of the compact disc ROM drive ROM drive circuit. The mixing unit 117 is connected to the input terminal 103 and the output terminal of the regeneration filter 114. Therefore, the mixing unit 117 synthesizes and outputs the reproduced audio signal output from the reproduction filter 114 and the external audio signal received through the input terminal 103. Thereafter, the amplifying unit 115 amplifies and outputs the mixed signal, and the adjusting unit 116 controls the volume of the mixed audio signal controlled by the volume terminal located in front and outputs the mixed signal to the first output terminal 101. The audio signal output from the first output terminal 101 is reproduced through the connected headphone or speaker. Accordingly, it can be seen that the audio signal reproduced from the compact disc and the external audio signal generated from the sound card can be synthesized in the compact disc ROM drive circuit, and the volume can be adjusted through the adjuster 116 located at the front.

When the output terminal of the external audio device is not connected to the input terminal 103, the mixing unit 117 receives only the internal audio signal output from the playback filter 114 without input of an external audio signal, thereby keeping the audio signal of the compact disc as it is. Output to the amplifier 115. Accordingly, it can be seen that the audio signal finally output through the first output terminal 101 is an audio signal reproduced from the compact disc.

In addition, the output of the regeneration filter 114 is applied to the mixing unit 117 and to the second output terminal 102. Therefore, it can be seen that the audio signal reproduced by the compact disc ROM drive circuit can be output to an external audio device in a conventional manner.

In the compact disc ROM drive circuit as described above, if an audio characteristic and level correction circuit is added between the input terminal 103 and the mixing unit 117 and between the regeneration filter 114 and the mixing unit 117, the audio signal output through the first output terminal 101 is provided. Can be made even better.

As described above, the compact disc ROM drive circuit according to the present invention has an advantage in that it can be effectively implemented when the audio signal of the external audio device is mixed with the reproduced audio signal.

Claims (3)

A system built-in compact disc ROM drive circuit, comprising: an input terminal disposed at the rear side, which can be connected to an output terminal of an external audio device, an output terminal located at the front side, and reproducing means for reproducing data recorded on the compact disc; And a mixing means for mixing the audio signal received from the input terminal and the audio signal output from the reproduction means and applying it to the output terminal. The compact disc ROM drive circuit of claim 1, further comprising a second output terminal disposed at the rear surface to connect an output of the reproduction means to an external audio device. 3. The compact disc ROM drive circuit according to claim 2, further comprising adjusting means for adjusting the volume of the output audio signal between the output terminal and the mixing means.