KR19980067863U - CD (Audio) Audio Transmitter - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

CD player

2. The technical problem the invention is trying to solve

In the conventional CD player is connected to the main body and speakers or wired to solve the disadvantage that you can hear the playback sound only where the CD player is located.

3. Summary of solution of design

A pickup 10 for reproducing audio data recorded on the disc; A digital signal processor 20 for restoring the digital audio data reproduced by the pickup 10 to an original digital signal; A digital / analog converter 30 for converting the digital audio data processed by the digital signal processor 20 into an analog audio signal; The transmitter 40 is characterized by consisting of a transmitter (40) for frequency-modulating and amplifying the analog audio signal obtained from the digital / analog converter 30 to transmit wirelessly so that it can be received by a wireless receiver within a certain distance.

4. Important uses of the devise

This is applied to the output sound of a CD player.

Description

CD (Audio) Audio Transmitter

The present invention relates to a CD player, which is a high quality playback medium, and more particularly to a CD player that allows output audio to be transmitted wirelessly so that CD audio can be listened to at a distance far from the CD player.

In general, a CD player is a high quality playback medium, and a main body and a speaker for outputting voice are connected by wires, and thus the distance thereof is limited.

Of course, it is possible to secure a certain long distance by increasing the distance of the wire, but in this case, since the main body and the speaker are connected by wire, the installation is complicated and the signal is lost due to the length of the transmission line. It is an obstacle to listening to clean sound.

In other words, the CD player of the general concept is connected to the main body and the speaker by a wire that can maintain a certain distance, and the audio can be heard only when the CD player is located near the CD player.

Of course, if the CD player's volume level is maximized, you can hear the audio from a distance away from the CD player, but it's not a normal audio listening because it disturbs others.

Therefore, the present invention is proposed to improve the disadvantages of the general CD player as described above, and an object of the present invention is to allow the output voice to be transmitted wirelessly and to receive and listen to it at a far wireless receiver so that it is considerably different from the CD player. It is to provide an audio wireless transmission device of a CD player that allows listening to audio of a CD even in a remote place.

Technical means for achieving this object of the present invention;

Pickup for reproducing audio data recorded on the disc;

A digital signal processor for restoring the digital audio data reproduced by the pickup to an original digital signal and correcting a data error;

A digital / analog converter for converting the digital audio data processed by the digital signal processor into an analog audio signal;

The transmitter is configured to perform a frequency modulation, power amplification, and amplification on an analog audio signal obtained from the digital / analog converter to wirelessly transmit the signal to a wireless receiver within a predetermined distance.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention in detail as follows.

1 is a block diagram of an audio radio transmitter of a CD player according to the present invention.

* Description of the symbols for the main parts of the drawings *

10 pickup 20 digital signal processing unit

30: digital / analog converter 40: transmitter

50: amplification and filter unit

1 is a block diagram of an audio radio transmitter of a CD player according to the present invention.

As shown therein, a pickup 10 for reproducing audio data recorded on the disc; A digital signal processor (20) for restoring the digital audio data reproduced by the pickup (10) to an original digital signal and correcting a data error; A digital / analog converter 30 for converting the digital audio data processed by the digital signal processor 20 into an analog audio signal; A transmitter 40 which modulates and amplifies the analog audio signal obtained by the digital / analog converter 30 and transmits it wirelessly to be received by a wireless receiving apparatus within a predetermined distance; The amplification and filter unit 50 removes the noise of the analog audio signal obtained from the digital / analog converter 30 and then amplifies and outputs it to the speaker or earphone side.

Referring to the operation of the audio radio transmitter of the CD player according to the present invention configured as described above are as follows.

First, when a listener inserts a disc to be listened to and operates a playback key, the pickup 10 controls the digital audio recorded on the inserted disc under the control of a controller (not shown) that controls the overall player operation. Data (optical signal) is read. The digital audio data (optical signal) thus read is photoelectrically converted by the digital signal processing unit 20 to be converted into electrical digital audio data, and demodulated to original digital audio data (the digital data is modulated and recorded on the CD by EFM modulation). After that, it is transmitted to the digital / analog converter 30.

Then, the digital / analog converter 30 converts the transmitted digital audio data into a corresponding analog audio signal, and the converted analog audio signal is transmitted to the transmitter 40 and the amplification and filter unit 50, respectively. Delivered.

The amplification and filter unit 50 removes the noise from the transmitted analog audio signal, and amplifies it to a predetermined level and outputs it to the earphone or the speaker, thereby providing clear and clean audio quality to the listener in proximity to the player.

On the other hand, the transmitter 40 modulates the transmitted analog audio signal (FM) and amplifies and transmits the power as a radio frequency. At this time, an external listener can transmit the radio signal through a wireless receiver (small radio, small cassette, etc.). You will hear the audio from the CD being sent to.

Here, the transmitter 40 does not modulate a frequency into a commonly used FM band, but modulates and transmits a frequency signal into an FM signal that can be received only at a very close distance.

Although the present invention has been described to transmit an audio signal in analog, in fact, it is also possible to transmit digital audio. However, in order to transmit digital audio data, it is recommended to transmit analog radio signals in consideration of the competitiveness and economic efficiency of the product because the transmission circuit is complicated, the product volume is quite large, and the expensive product must be used.

As described above, the present invention can wirelessly transmit the audio output from the CD player, so that the audio output from the CD player in the home can be listened to through the simple wireless receiver even at a considerable distance from the CD player. There is.

The present invention allows a player playing a compact disc (CD) to transmit the output audio wirelessly and to receive and listen to it from a remote radio receiver so that the audio of the CD can be listened to even in a place far away from the CD player. It is to provide an audio wireless transmitter of a CD player.

Claims (1)

In a CD player for playing back audio data recorded on a disc, A pickup (10) for reproducing the audio data recorded on the disc; A digital signal processor 20 for restoring the digital audio data reproduced by the pickup 10 to an original digital signal; A digital / analog converter 30 for converting the digital audio data processed by the digital signal processor 20 into an analog audio signal; CD player, characterized in that it comprises a transmitter 40 for wirelessly transmitting the radio frequency signal modulated, power-amplified and received by a wireless receiving device within a certain distance from the digital / analog converter 30 Audio wireless transmitter.