KR970001852B1 - Multi-broadcasting receiving device - Google Patents

Abstract

A simultaneous receiving apparatus of multi-broadcasting is provided, which includes first and second FM/AM tuning parts (1,2) respectively for selecting a predetermined broadcasting bureau via an antenna, first and second phase lock loops (PLL)(3,4) respectively for detecting phase differences between an input signal frequency and a reference frequency, a microcomputer (5) for controlling whole functions of the system according a signal output from the first and second PLLs (3,4), a function key input part (6), a display part (7) for displaying frequency or channel of the selected broadcasting bureau according to the signal output from the microcomputer (5), a signal switching part (8) for selecting a predetermined signal out of tuning signals of two channels from the first AM/FM tuning part (1,2), a CD player signal and a tape signal to output, a volume adjusting part (9) for adjusting the two channel output signals of the signal switching part (8) according to volume data output from the microcomputer (5), first and second power amplification parts (10,11) for amplifying sound signal output from the volume adjusting part to output to speakers (SP), a pre-amplification part (12) for amplifying a broadcasting signal of the selected in the second FM/AM tuning part (1,2) to output via ear phones (13), and an equalizing amplification part (14) for equalization-amplifying the tape signal which is reproduced by tape head of the two channels to apply it to the signal switching part (8), wherein even while a user is listening to sound signals from one of FM/AM, tape, or CD, another user may select and listen to another sound signals simultaneously.

Description

Multicast simultaneous listening device

1 is a block diagram of an apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

1,2: First and second FM / AM tuning section 3,4: First and second PLL section

5: microcomputer 6: function key input unit

7: display unit 8: signal switching unit

9: volume control unit 10,11: first and second power amplifier

12: preamplifier 13: earphone

14 equalization amplifier 15 tape head SP speaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-way simultaneous listening device. In particular, one or more people riding and driving a car with a car audio installed, for example, want to listen to a traffic broadcast, and the other ship is a music broadcast or a tape or CD. The present invention relates to a multi-broadcasting simultaneous listening device that can satisfy all of them in a single system.

Since a conventional audio system is configured to listen to a single broadcast or to select only one of a tape or CD mechanism, when two or more people want to listen to a predetermined broadcasting station using one audio system, they have a different taste. If they do not coincide with each other, there is a possibility of conflicting opinions, and other people's choice of broadcasting contents that do not suit their own tastes may cause problems such as depriving the listeners of the broadcasting itself.

It is an object of the present invention, while one user is listening to an acoustic signal through one of the following mechanisms: FM / AM, tape and CD. The present invention provides a multicast simultaneous listening device capable of selecting and listening to a broadcast.

That is, the present invention is to provide a multi-broadcasting simultaneous listening apparatus that can simultaneously listen to various audio sources in the same system.

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

As shown in FIG. 1, the apparatus for simultaneously listening to multicasting according to the present invention includes first and second FM / AM tuning units (1, 2) for tuning a predetermined broadcast station among AM or FM broadcasts received through an antenna ANT, respectively. Wow; Detecting the phase difference between the two oscillators so that the oscillation frequency to be output from the broadcast signal tuned by the first and second FM / AM tuning units 1 and 2 is completely tuned or coincided with the frequency of the input signal or the reference oscillator, respectively. First and second phase lock loop (PLL) portions 3 and 4; A microcomputer 5 which receives a predetermined signal output from the first and second PLL units 3 and 4 and performs an overall control function of the system; A function key input unit 6 having various keys installed therein including a multi-mode selection key; A display unit 7 which receives a predetermined output signal from the microcomputer 5 and displays frequencies and channels of tuned broadcasting stations; A signal switching unit (8) which selects and outputs a predetermined signal from two channels of tuning signals, CD plater signals, and tape signals output from the first FM / AM tuning units (1, 2); A volume controller 9 for adjusting a two-channel output signal of the signal switching unit 8 to a size corresponding to the volume data output from the microcomputer 5; The first and second power amplifiers for amplifying the sound signal is adjusted to a predetermined level in the volume control unit 9 to a predetermined level and output to the front and rear speaker SP installed in the left and right ( 10,11); A preamplifier 12 for amplifying a broadcast signal tuned by the second FM / AM tuning unit 1 and 2 to a predetermined level and outputting the same through the earphone 13; And an equalization amplifier 14 for equalizing and amplifying the tape signal reproduced from the two-channel tape head 15 and applying it to the signal switching section 8.

Referring to the effects of the present invention configured as described above are as follows.

First, when one of the broadcast, tape, or CD is selected to listen to a sound signal, the multi-mode selection key installed in the function key input unit 6 is turned off, so as in the general audio system, the second FM / AM The driving of the tuning section 2, the second PLL section 4 and the preamplifying section 12 is cut off and only the remaining part is operated.

That is, when the audio system is turned on while the multi-mode selection key installed in the function key input unit 6 is turned off, the transmission frequency for a predetermined broadcast station preset by the function key input unit 6 is set to the first FM / AM tuning unit ( 1) is tuned by 1) and output to the signal switching section 8 as a two-channel tuning signal and simultaneously to the first PLL section 3, so that the first FM / AM tuning section 1 The oscillation frequency to be outputted from the tuned broadcast signal is detected and sent to the microcomputer 5 so that the phase difference between the two oscillators is completely synchronized or coincided with the frequency of the input signal or the reference oscillator.

In addition, the microcomputer 5 displays the transmission frequency for the broadcasting station tuned to the display unit 7 and the driving state of the channel or CD and tape, and simultaneously controls the predetermined volume signal set by the function key input unit 6. Since the control unit 9 outputs the sound signal output from the signal switching unit 8 to the two power amplifiers 10 and 11 in a predetermined size.

At this time, the signal switching unit 8, in addition to the broadcasting station signal, the tape signal reproduced by the two-channel tape head 15 and equalized and amplified to a predetermined level through the equalization amplifier 14 and the sound signal output from the CD are output. It is input.

Accordingly, a predetermined sound signal is output from the signal switching unit 8 according to whether the user selects whether to listen to the broadcast, the CD, or the tape through the function key input unit 6, so that the volume control unit 9 is turned on. After the volume is adjusted, the first and second power amplifiers 10 and 11 are amplified to a predetermined level through the frame and are output to the speaker SP installed at the front and rear parts of a car.

On the other hand, if the multi-mode selection key is turned on by another user while listening to any sound signal of a broadcast signal, a tape playback signal, or a CD signal that is being broadcast by a predetermined broadcast station as described above, the predetermined broadcast station is tuned. The microcomputer 5 pre-amplifies the transmission signal of a broadcasting station (for example, a traffic broadcasting or a special purpose broadcasting station) tuned by the second FM / AM tuning unit 2 through the second PLL unit 4. The preamplifier 12 amplifies the broadcast signal tuned by the second FM / AM tuning unit 2 to a predetermined level and outputs it through the earphone 13.

At this time, the display unit is switched to the multi-mode on to perform various operations such as broadcasting station tuning and memory using the function key input unit, the display unit is displayed in the multi-mode on for 10 seconds after the operation of the last function key input unit 10 seconds later, the display unit Reduced to multi-mode off state.

Therefore, other contractors who do not like to listen to the sound signal output through the main speakers (SP) at the same time through the earphone 13 and irrespective of the sound signal (broadcast signal, tape and CD playback signal) You can feel different broadcasting.

At this time, the size of the sound signal (ie, a predetermined broadcast signal) output through the earphone 13 is adjusted by the volume installed in the earphone itself.

As described above, according to the present invention, while one user is listening to a predetermined sound signal among FM / AM, tape, and CD, others around him select and listen to the content currently being listened to and another broadcast signal. This allows you to listen to multiple audio sources simultaneously on the same system, greatly improving product reliability.

Claims (2)

First and second FM / AM tuning units which tune to predetermined broadcast stations, respectively, among AM or FM broadcasts received through an antenna; First and second detecting phase shifts of the two oscillators so that the oscillation frequencies to be output from the broadcast signals tuned by the first and second FM / AM tuning units are perfectly tuned or coincident with the frequencies of the input signals or the reference oscillators, respectively. A phase lock loop (PLL) section; A microcomputer that performs overall control of the system by receiving inputs of predetermined signals output from the first and PLL units and the function key input unit; A function key input unit 6 provided with various keys; A display unit which receives a predetermined output signal from the microcomputer and displays a frequency and a channel of a tuned station; A signal switching unit which selects and outputs a predetermined signal from two channels of a tuning signal, a CD plater signal, and a tape signal output from the first FM / AM tuning unit; A volume control unit controlling a two-channel output signal of the signal switching unit to a size corresponding to the volume data output from the microcomputer; First and second power amplifiers for amplifying the sound signals, which are adjusted to a predetermined size by the volume control unit, to a predetermined level and outputting them to the speakers installed at the left and right sides of the front and rear parts; A pre-amplifying unit for amplifying the broadcast signal selected by the second FM / AM tuning unit to a predetermined level and outputting the same through an earphone; And an equalization amplifier section (14) for equalizing and amplifying the tape signal reproduced from the two channel tape heads to the signal switching section. The apparatus of claim 1, wherein the function key input unit comprises a multi-mode selection key.