KR20010003280A - Radio receiver in automobile - Google Patents

Abstract

PURPOSE: A device for receiving a radio broadcasting for a car is provided to receive many radio frequency(RF) signals output from different radio broadcasting stations in a form of different frequency to select a signal with a high intensity and no noise, and to generate a voice signal according to the selected signal, so that a user can listen to the radio broadcasting of a good quality without noises. CONSTITUTION: A first tuner(110) demodulates a radio frequency(RF) signal delivered from one broadcasting station among radio frequency signals of each different frequency delivered from many broadcasting stations into an original signal wave, and converts the demodulated signal wave into from an analog form to a digital form through a mounted analog to digital converter(ADC) to output the demodulated signal wave. A second tuner(111) demodulates a radio frequency(RF) signal corresponding to a frequency delivered from another broadcasting station among radio frequency signals of each different frequency delivered from many broadcasting stations into an original signal wave, and converts the demodulated signal wave into from an analog form to a digital form through a mounted analog to digital converter(ADC) to output the demodulated signal wave. Buffers(120,121) temporally delays the signal waves output from the first tuner(110) and the second tuner(11) to output the signal waves. A comparator(130) compares voltage levels of the signal waves output from the buffers(120,121), and outputs a result signal corresponding to a compared result. A signal analyzer(140) selectively passes one signal wave of the signal waves output from the buffers(120,121) according to the result signal applied from the comparator(130), and passes another signal wave when a noise component is detected from a selected signal wave. An amplifier(150) converts the signal waves applied from the signal analyzer(140) into from a digital form to an analog form through a mounted digital to analog converter(DAC) to amplify the signal waves according to a determined amplifying rate. A speaker(160) converts the amplified signal waves into audible voice signals to output the converted audible voice signals.

Description

Car Radio Receiver {RADIO RECEIVER IN AUTOMOBILE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle radio receiving apparatus, and more particularly, to a vehicle radio receiving apparatus capable of listening to a radio broadcast of good quality without noise.

In general, a vehicle radio receiver is a device that receives a radio frequency signal ("RF signal") transmitted from a radio station and converts it into a voice signal and outputs it to a driver in a vehicle interior. As shown, the tuner 10 receives a radio frequency signal transmitted from a radio station through an antenna, and extracts, ie, demodulates, a signal wave carried on a frequency selected by a dual user, and a signal demodulated by the tuner 10. And an amplifier 20 for amplifying the wave at a predetermined amplification rate, and a speaker 30 for converting the signal wave amplified by the amplifier 20 into an audible voice signal and outputting the audible audio signal.

However, such a conventional vehicle radio receiver has a problem in that when a user listens to a radio broadcast when noise is mixed in a radio frequency signal transmitted from a radio station.

In addition, when the vehicle moves, the radio frequency signal transmitted from the radio station of the starting point is weak, there is a problem that can not listen to the radio broadcast of good sound quality.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, receiving radio frequency signals of different frequencies transmitted from radio stations in different regions, and selecting a good radio frequency signal, and selecting a voice signal. It is an object of the present invention to provide a radio receiver for a vehicle that can always listen to radio broadcast of good quality.

1 is a schematic block diagram of a general vehicle radio receiver;

Figure 2 is a schematic block diagram of a vehicle radio receiving apparatus according to a preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110, 111: Tuning section 120, 121: Buffer section

130: comparator 140: signal analysis unit

150: amplifier 160: speaker

A vehicle radio receiver according to the present invention for achieving the above object comprises: a plurality of station units for receiving a radio frequency signal of a frequency selected by a user and demodulating the signal into an original signal wave, and signal waves output from the plurality of station units. And a signal processing means for selecting and outputting a signal wave having a strong signal intensity and no noise, and a voice output means for converting the signal output from the signal processing means into an audible voice signal and outputting the audible voice signal.

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

2 is a schematic block diagram of a vehicular radio receiver according to a preferred embodiment of the present invention. As can be seen from the same drawing, the vehicular radio receiver of the present invention includes a first station 110 and a second station. The tuner 111 includes a pair of buffer units 120 and 121, a comparator 130, a signal analyzer 140, an amplifier 150, and a speaker 160.

In FIG. 2, the first channel selector 110 transmits a radio frequency signal transmitted from any one of radio frequency signals of different frequencies transmitted from broadcast stations in a plurality of regions, that is, broadcast stations in regions A and B. After demodulating the original signal wave, the demodulated signal wave is converted from analog form to digital form through an embedded A / D converter ("ADC"), and is outputted. Demodulates the radio frequency signal corresponding to the frequency transmitted from the other station among radio frequency signals of different frequencies transmitted from broadcasting stations of multiple regions, that is, stations A and B, and then demodulates the original signal wave. The demodulated signal wave is converted from analog form to digital form and output through the built-in A / D converter.

The pair of buffer units 120 and 121 respectively delay and output the signal waves output from the first and second tuning units 110 and 111, respectively, and the comparator 130 is configured to output the pair of buffer units. The voltage levels of the signal waves output from each of (120, 121) are compared, and a result signal corresponding to the comparison result is output.

The signal analyzing unit 140 selectively passes any one of the signal waves output from the pair of buffer units 120 and 121 according to the result signal applied from the comparator 130, but noise in the selected signal wave. When a component is detected, the other signal wave is passed.

The amplifying unit 150 converts the signal wave applied from the signal analyzing unit 140 from a digital form into an analog form through a built-in D / A converter (DAC), and then a predetermined amplification ratio. The speaker 160 converts the signal wave amplified by the amplifier 150 into an audible voice signal and outputs the amplified audio signal.

An operation example of the present invention configured as described above will be described in detail with reference to FIG.

First, radio frequency signals of different frequencies are transmitted from broadcasting stations of a plurality of regions, for example, broadcasting stations of region A and broadcasting stations of region B. FIG.

At this time, if the user sets the reception frequency in the first and second selection units 110 and 111 so that the frequencies output from the broadcast stations in the region A and the region B are respectively tuned, the radio is transmitted from the region A broadcast station. The frequency signal is demodulated to the original signal wave in the first channel selection unit 110, and then converted and output from the analog form to the digital form, and the radio frequency signal transmitted from the local broadcasting station B is the original signal in the second channel selection unit 111. It is demodulated into waves and then converted from analog to digital form and output.

The signal wave output from the first channel selector 110 is output after a delay in the buffer unit 120 and is applied to the inverting terminal (-) and the signal analyzer 140 of the comparator 130. The signal wave output from the selecting unit 111 is output after a delay in the buffer unit 121 and is applied to the non-inverting terminal (+) and the signal analyzing unit 140 of the comparator 130.

At this time, the comparator 130 compares the voltage level of the signal wave applied from the first channel selection unit 110 and the signal wave applied from the second channel selection unit 111 and outputs a result signal having a polarity corresponding to the comparison result. It is applied to the signal analyzer 140.

For example, when the voltage level of the signal wave applied from the first tuning unit 110 is higher than the voltage level of the signal wave applied from the second tuning unit 111, a resultant signal of negative (−) is output and When the voltage level of the signal wave applied from the two channel selecting unit 111 is higher than the voltage level of the signal wave applied from the first selecting unit 110, a result signal of positive polarity (+) is output.

According to the polarity of the result signal output from the comparator 130, the signal analysis unit 140, either the signal wave applied from the first channel selection unit 110 and the signal wave applied from the second channel selection unit 111 If the selected signal wave contains noise components, the output of the selected signal wave is stopped and the other signal wave is output instead.

The signal wave output from the signal analyzer 140 is converted from the digital form into the analog form through the amplifier 150 and then amplified at a predetermined amplification rate. The signal wave output from the amplifier 150 is a speaker ( 160 is converted into an audible voice signal and output.

That is, the present invention receives a plurality of radio frequency signals output at different frequencies from radio stations in different regions, compares the voltage levels of the received signals, selects the signal having the greater signal strength, and selects the selected signal. When a noise component is detected at, an audio signal is generated by outputting a signal other than the selected signal.

In other words, the present invention selects a signal having a high signal strength and no noise from among a plurality of radio frequency signals and generates a voice signal accordingly, so that a user can listen to a radio broadcast having no noise and good sound quality.

As described above, according to the present invention, a plurality of radio frequency signals output at different frequencies are received from radio stations in different regions, and a signal having a high strength and no noise is selected, and the audio signal is selected according to the selected signal. By generating a, there is an effect that the user can always listen to a radio broadcast of a good sound quality without noise.

Claims (2)

In the vehicle radio receiving apparatus, A plurality of station units which receive a radio frequency signal of a frequency selected by the user and demodulate it into an original signal wave; Signal processing means for selecting and outputting a signal wave having a strong signal intensity and no noise among the signal waves output from the plurality of tuning units; And a voice output means for converting the signal output from the signal processing means into an audible voice signal and outputting the same. The method of claim 1, wherein the plurality of channel selector comprises an analog-to-digital converter for converting the analog-type signal wave to a digital form and outputting it, The signal processing means compares and compares the voltage levels of the signals output from the plurality of buffer sections with a plurality of buffer sections for delaying and outputting each of the digital signal waves outputted from the plurality of channel selection sections. A comparator for outputting a result signal corresponding to a result, and selectively passing a signal wave output from any one of the plurality of buffer units according to the result signal applied from the comparator, when noise component is detected in the selected signal wave It consists of a signal analysis section for passing the signal wave output from the other buffer portion in place of this signal, And the voice output means comprises a digital-to-analog converter for converting a digital signal wave output from the signal processing means into an analog signal wave.