KR20160032434A - Method for control equalizer of audio system - Google Patents

Abstract

The present invention relates to a method of controlling an equalizer of an audio system, capable of outputting a sound of optimized quality in accordance with types of broadcasts by identifying and recognizing the types of the output AM/FM radio broadcasts represented by talk and music shows. The method of controlling an equalizer of an audio system comprises the steps of: receiving an AM or FM broadcast radio signal through an antenna; receiving at least one of a mid-processed signal generated at a tuner in the procedure of processing the received AM or FM broadcast radio signal and an analog signal finally outputted from a digital signal processor (DSP) to an amplifier; identifying and recognizing a broadcast type of the received radio signal by analyzing at least one of the received mid-processed signal and the analog signal; adjusting an equalizer value to a value corresponding to the recognized broadcast type; and controlling the output of the sound through the amplifier and a loudspeaker according to the adjusted equalizer value.

Description

[0001] The present invention relates to a method of controlling an equalizer of an audio system,

The present invention relates to an equalizer control method for an audio system, and more particularly, to an equalizer control method for an AM / FM radio broadcast, which discriminates and recognizes a type of broadcast represented by a talk and music in outputting an AM / FM radio broadcast, To an equalizer control method of an audio system.

 The development of acoustic and multimedia technologies today is driving the evolution of comfortable cars and convenient cars that can provide infotainment to drivers and systems that can provide high quality sound and multimedia content to both the driver and passengers in the vehicle. Development.

In recent years, as interest in multimedia systems has increased, interest in audio systems of vehicles has also been increasing. The audio system of a vehicle includes various source sources such as compact disc (CD), AM (MP3) audio layer 3 (MP3) file, and the like, such as an audio signal, an audio signal, an audio signal, and an audio signal.

It is necessary to use an amplifier for amplifying an audio signal and a speaker for outputting an amplified audio signal in outputting audio and multimedia contents in a vehicle and an audio system (or AVN (Audio, Video & Navigation) System), the main components for sound reproduction and output are a head unit with a built-in microcomputer and a digital signal processor (DSP), an amplifier, and speakers installed at various positions in the vehicle.

Here, the DSP performs digital signal processing on the audio signal inputted through the input terminal under the control of the microcomputer, and the amplifier amplifies the audio signal outputted after the signal processing in the DSP, and outputs the amplified audio signal to each speaker in the vehicle.

Meanwhile, while driving a vehicle, a storage medium such as a memory of a USB device or a smart device can be connected to a vehicle to reproduce a sound source, or to listen to media music using bluetooth.

However, many drivers are driving while listening to AM / FM radio, so it is still important to optimize AM / FM reception and sound quality in the car.

In addition, the radio is mainly used for talk and music-based broadcasting, and the mass-produced car audio system is providing broadcasting sound quality regardless of the type of broadcasting represented by talk and music, Equalizer function is provided so that broadcast sound quality can be output.

That is, the driver can set the EQ mode to one of the preset modes such as talk, jazz, and classic, and set the EQ mode to output the broadcast sound quality according to the set equalizer mode (Perform sound correction according to the set equalizer value).

More specifically, some advanced car audio systems offer equalizer mode settings, and if you set the equalizer mode to talk, jazz, classic, rock, pop, etc., And provides sound quality to the set mode at the time of sound output.

For example, when the user selects the talk mode, the microcomputer of the audio system reduces the bass / treble, enhances the clarity of the broadcast voice by utilizing the midtone, and enables the sound of the sound with the bass / treble to be output when the music is selected.

However, music may be broadcast while the user has set the talk mode. In this case, the bass and treble of the music are reduced, so that the user will feel frustrated when listening.

On the other hand, if the user selects the music mode, it is necessary to listen to the broadcast in the case of the talk broadcast, taking into account that the clarity of the human voice is reduced.

As described above, in the conventional audio system, if the user selects and sets the equalizer mode in advance, the equalizer mode set by the user is provided regardless of the type of broadcasting.

In order to receive the broadcasting quality desired by the user, it is necessary to change the equalizer mode or the equalizer value every time according to the broadcasting type. In particular, it is difficult to change the equalizer every time in real- impossible.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide an AM / FM radio broadcasting system capable of distinguishing and recognizing types of broadcasting represented by a talk and music, And to provide a method of controlling an equalizer of an audio system.

It is another object of the present invention to provide a method for automatically adjusting an equalizer setting value according to a broadcast type to provide an optimum broadcast sound quality.

According to an aspect of the present invention, there is provided a method for transmitting a radio signal, the method comprising: receiving a radio signal of an AM or FM broadcast through an antenna; Receiving at least one of an intermediate processing signal in a tuner generated in processing the radio signal of the received AM or FM broadcast and an analog signal finally output to an amplifier in a digital signal processor (DSP); Analyzing at least one of the input intermediate processing signal and the analog signal to discriminate and recognize a broadcast type of the received radio signal; Adjusting an equalizer value to a value according to the recognized broadcast type; And controlling the audio output through the amplifier and the speaker according to the adjusted equalizer value.

Herein, it is assumed that the broadcast type of the recognized radio signal is one of talk and music, and that when the equalizer value is adjusted, either the torque mode or the music mode, in which the equalizer value is preset as the preset mode, And the equalizer mode is selected for the control.

The intermediate processing signal is an intermediate frequency (IF) modulated signal of an intermediate frequency band converted from a radio signal by the tuner. In the step of discriminating and recognizing the type of the received radio signal, And recognizes the broadcast type of the radio signal as music when the set value is equal to or greater than the preset intensity.

Further, when the intensity of the IF modulated signal is less than the set intensity, the broadcast type of the radio signal is recognized as a talk.

Further, the present invention is characterized by recognizing a broadcast type of a radio signal as music when a frequency component of a frequency of an analog signal in the DSP is higher than a preset frequency.

In addition, when only a frequency component less than the set frequency is present among the frequencies of the analog signal, the broadcast type of the radio signal is recognized as a talk.

The intermediate processing signal may be an intermediate frequency (IF) modulated signal of an intermediate frequency band converted from a radio signal by the tuner. In the discriminating and recognizing of the type of the received radio signal, When the condition that the frequency of the analog signal in the DSP is less than the set intensity and the condition in which only the frequency component less than the set frequency exists are all satisfied as the talk intensity, the broadcast type of the radio signal is recognized as talk .

In addition, if one of the two conditions is not satisfied, the broadcasting type of the radio signal is classified into music.

Accordingly, the equalizer control method of the audio system according to the present invention has the following effects.

1) It is possible to distinguish and recognize the kind of broadcast such as torque or music in the output of AM / FM radio broadcast, and to set the equalizer mode automatically according to the type of broadcast, thereby providing the optimum broadcast sound quality.

2) Even when the talk and music are alternately appeared in the radio broadcast, the user automatically switches to the optimum equalizer mode corresponding to the broadcast type in real time so that the user can always listen to the optimum broadcast sound quality.

3) It is possible to automatically adjust the equalizer setting value according to the broadcast type to provide optimum broadcast sound quality.

1 is a block diagram of an audio system for performing an equalizer control method according to the present invention.
2 is a flowchart illustrating an equalizer control method according to the present invention.
3 is a graph illustrating IF modulation signal strength in a tuner according to a broadcast type in the present invention.
4 is a graph illustrating an audio frequency in a DSP according to a broadcast type in the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

The present invention provides a method of controlling an equalizer of an audio system capable of outputting an optimal sound quality according to a broadcast type by discriminating and recognizing a type of broadcast represented by a talk and music in output of an AM / FM radio broadcast.

In particular, in the present invention, a car is classified and recognized from a radio signal received through an antenna, and an automatic equalizer mode is automatically set or changed in an optimized mode for a broadcast type, So that it can be output through the network.

FIG. 1 is a block diagram of an audio system for performing an equalizer control method according to the present invention, and FIG. 2 is a flowchart illustrating an equalizer control method according to the present invention. Referring to FIG.

FIG. 3 is a graph showing the strength of an IF modulated signal according to a broadcast type in the present invention, and FIG. 4 is a graph illustrating an audio frequency in a DSP according to a broadcast type in the present invention.

1, an equalizer control method according to the present invention is applied to an audio system. More specifically, an AM / FM radio frequency (RF) broadcast signal is transmitted from an antenna 10 to a vehicle And processes the received broadcast signal and outputs the processed broadcast signal through a speaker 60. [

As shown, the audio system includes an antenna 10 for receiving an AM / FM radio (RF) signal, an LNA (Low Noise Amplifier) 20 for low-noise amplifying and outputting a radio signal received through the antenna 10 A tuner 30 for selecting and outputting a signal of a broadcasting frequency band set in the signal output from the LNA 20, a digital signal processor for processing the signal output from the tuner 30, An amplifier 50 for amplifying an analog sound signal output from the DSP 40, a speaker 60 for outputting a signal amplified by the amplifier 50 as an acoustic signal, And a microcomputer 70 for controlling the operation of the element.

Here, the basic functions performed by the above-mentioned components are not different from the conventional ones until the radio signals are received from the vehicle and processed to output the speaker 60. These components are known elements of the radio system So that detailed description will be omitted.

The signal processing in the tuner 30, which outputs a radio signal converted into a set frequency among the above-mentioned components, processes a radio signal through the LNA 20 to generate a signal of an intermediate frequency band, that is, an IF (intermediate frequency) The signal processing in the tuner 30 is a well-known signal processing process performed for radio sound output.

In the present invention, the RF modulating component in the tuner 30 is analyzed. In more detail, the micom 70 analyzes the IF modulated signal converted from the RF signal by the tuner 30, The type is recognized.

The DSP 40 converts the signal output from the tuner 30 into a digital signal and then converts the digital signal into an analog signal through a predetermined signal processing process and outputs the analog signal to the amplifier 50. The DSP 40 The amplifier 50 amplifies the output analog signal and outputs the amplified analog signal through the speaker 60.

The signal processing in the DSP 40 is a well-known process. However, in the present invention, the DSP 40 may analyze the audio frequency of an analog signal finally output to the amplifier 50, .

As described above, according to the present invention, an intermediate processing signal generated in processing the AM / FM radio signal received through the antenna 10 or an analog signal processed in the DSP 40 and finally output to the amplifier 50 is analyzed Type.

Referring to FIG. 3, the intensity of the IF modulation signal is shown in the tuner 30. In view of the fact that the magnitude of the IF modulation signal for the RF signal differs between the torque and the music broadcast, The IF modulated signal of the tuner 30 shown in FIG. 4A is received and the intensity is analyzed to distinguish the type of the broadcast represented by the talk and music.

In a broadcasting station, the modulation rate of the RF signal is different in order to enhance the sound field in the music broadcasting. In the case of music, FM broadcasting uses a modulation rate of 50 kHz or more and AM broadcasting uses a modulation rate of 50% or more

In addition, in the case of talk broadcast among normal radio broadcasts, the size of the IF modulation signal in the tuner 30 is less than 0.4 V, and in the case of music broadcast, the signal amplitude is usually less than 1 V.

Therefore, when the IF modulation signal is analyzed by using the signal magnitude that can distinguish between the talk and music from the magnitude of the IF modulation signal and the magnitude of the signal capable of distinguishing the talk and music, the broadcast type can be recognized by the torque or music .

For example, when the set strength is set to 0.6, the type of the broadcast can be recognized by music when the intensity of the IF modulated signal is 0.6 or more, and by the talk when the intensity is less than 0.6.

Accordingly, in the present invention, the microcomputer 70 compares the intensity of the IF modulated signal transmitted from the tuner 30 with the preset intensity, classifies and recognizes it as music when it is greater than the predetermined intensity, And controls the sound output through the speaker 60 in the selected equalizer mode by selecting any mode corresponding to the recognized broadcast type in the over-torque preset mode.

The details of controlling the sound output in accordance with the selected preset mode are well known in the art, and a detailed description thereof will be omitted.

That is, to control the sound output in the selected equalizer mode means to output the sound corresponding to the equalizer value of the selected mode, and to control the sound output corresponding to the equalizer value, It is a known technical matter applied.

Referring to FIG. 4, the audio frequency of the analog signal in the DSP 40 is shown, and attention is paid to the difference between the talk frequency and the audio frequency band of the music (in the case of a human voice, , And the microcomputer 70 may analyze the audible frequency of the DSP 40 shown in FIG. 4 to distinguish and recognize the broadcast type.

In the case of talk broadcast among normal radio broadcasts, the analog signal in the DSP 40 has a frequency band of 500 Hz to 3 kHz, and in the case of music broadcast, it has all the frequencies of all bands.

Therefore, if the frequency capable of distinguishing between the torque and the music is appropriately set, it is possible to distinguish between the torque and the music based on the set frequency value.

For example, when the set frequency is set to 5 kHz, if the frequency component of 5 kHz or more exists in the audio frequency of the DSP 40, and if only the frequency component of less than 5 kHz exists, the broadcast type can be recognized by the torque.

Accordingly, in the present invention, the microcomputer 70 analyzes the frequency component of the analog signal transmitted from the DSP 40, and when there is a frequency component higher than the set frequency, only the frequency component less than the set frequency exists as music, And controls the sound output through the speaker 60 in the selected equalizer mode by selecting any of the modes corresponding to the broadcast type recognized in the music and torque preset mode as the equalizer mode.

In addition, it is possible to classify the broadcasting type by analyzing the signal from the tuner 30 or the signal from the DSP 40 alone. However, in order to improve the accuracy, the mode is classified using the two signals in combination It is also possible to do.

Referring to FIG. 2, after the radio on S11, the modulation signal strength in the tuner 30 is compared with a preset strength (e.g., 0.6) (S12) The equalizer mode is set to the music mode (S14).

At this time, if the modulated signal intensity is less than the preset intensity, the analog signal audible frequency component in the DSP 40 is analyzed (S13). If there is a frequency component higher than the set frequency (e.g., 5 kHz), only the frequency component If the sound is recognized as music, the equalizer mode is set to the music mode (S14). If the sound is recognized as the torque, the equalizer mode is set to the torque mode (S15).

As a result, the sound output is controlled to the equalizer mode selected according to the type of broadcast through the logic, and the same kind of logic is applied to the received radio signal to classify and recognize the broadcast type in real time, The real time conversion to the equalizer mode corresponding to the recognized broadcast type is performed.

The preset mode is a mode in which an equalizer (EQ) value is previously set according to a broadcast type so that an optimal sound output and sound quality can be provided, In order to increase the clarity of the voice, it is possible to reduce the bass and treble, to set the equalizer value so that the middle tone is strengthened, and to set the equalizer value to enhance the bass and treble in the music.

In this case, the user can improve the satisfaction with the radio listening since the user can listen to the radio clearly and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Forms are also included within the scope of the present invention.

10: Antenna
20: LNA
30: Tuner
40: DSP
50: Amplifier
60: Speaker
70: Microcomputer

Claims (8)

Receiving a radio signal of an AM or FM broadcast through an antenna;
Receiving at least one of an intermediate processing signal in a tuner generated in processing the radio signal of the received AM or FM broadcast and an analog signal finally output to an amplifier in a digital signal processor (DSP);
Analyzing at least one of the input intermediate processing signal and the analog signal to discriminate and recognize a broadcast type of the received radio signal;
Adjusting an equalizer value to a value according to the recognized broadcast type; And
And controlling the audio output through the amplifier and the speaker according to the adjusted equalizer value.
The method according to claim 1,
Wherein one of a talk mode and a music mode is a broadcast type of the recognized radio signal and one of a torque mode and a music mode in which an equalizer value is preset as a preset mode during the adjustment of the equalizer value, Wherein the equalizer mode is selected for the equalizer mode.
The method according to claim 1 or 2,
Wherein the intermediate processing signal is an intermediate frequency (IF) modulated signal of an intermediate frequency band converted from a radio signal by the tuner, and comparing the intensity of the IF modulated signal with the set intensity at the step of discriminating and recognizing the broadcast type of the received radio signal And recognizing the broadcast type of the radio signal as music when the set value is equal to or greater than a set intensity.
The method of claim 3,
And if the intensity of the IF modulated signal is less than a preset intensity, recognizes a broadcast type of the radio signal as a talk.
The method according to claim 1 or 2,
And if the frequency component of the frequency of the analog signal in the DSP is equal to or higher than a preset frequency, the broadcast type of the radio signal is recognized as music.
The method of claim 5,
And if the frequency of the analog signal is less than the set frequency, recognizes the broadcast type of the radio signal as a talk.
The method according to claim 1 or 2,
The intermediate processed signal is an intermediate frequency (IF) modulated signal of an intermediate frequency band converted from a radio signal by the tuner,
In the step of discriminating and recognizing the broadcast type of the received radio signal,
When the intensity of the IF modulated signal is compared with the set intensity and the condition that the intensity is lower than the set intensity and the condition that only the frequency component less than the set frequency exists in the frequency of the analog signal in the DSP is satisfied, wherein the audio signal is recognized as a talk signal.
The method of claim 7,
And if the one of the two conditions is not satisfied, classifies the broadcast type of the radio signal into music.

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