KR102109212B1 - Method for control equalizer of audio system - Google Patents

Abstract

The present invention relates to an equalizer control method of an audio system, and in the output of an AM / FM radio broadcast, an audio system capable of distinguishing and recognizing the types of broadcasts represented by talk and music and outputting optimal sound quality according to the types of broadcasts The main purpose is to provide a method for controlling the equalizer. In order to achieve the above object, 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 the process of processing the received AM or FM radio signal and an analog signal finally output from a digital signal processor (DSP) to an amplifier; Analyzing one or more of the input intermediate processing signal and an analog signal to distinguish and recognize the broadcast type of the received radio signal; Adjusting an equalizer value to a value according to the recognized broadcast type; And controlling the equalizer of the audio system comprising the step of controlling the sound output through the amplifier and the speaker according to the adjusted equalizer value.

Description

Method of control equalizer of audio system

The present invention relates to a method of controlling an equalizer of an audio system, and more specifically, to provide an optimal sound quality according to the type of broadcasting by distinguishing and recognizing the type of broadcasting represented by talk and music in the output of AM / FM radio broadcasting. It relates to an equalizer control method of the audio system.

 Today, advances in sound and multimedia technologies are 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 drivers and passengers in the vehicle. It is leading to development.

In addition, in recent years, as interest in a multimedia system has increased, interest in an audio system of a vehicle has also increased, and an audio system of a vehicle has various sound source sources, such as a compact disk (CD), AM ( It plays various sound source sources such as radios such as Amplitude Modulation (FM) / Frequency Modulation (FM), and Motion Picture Experts Group (MPEG) audio layer 3 (MP3) files.

As is known, in outputting sound and multimedia contents from a vehicle, it is essential to use an amplifier that amplifies the audio signal and a speaker that outputs the amplified audio signal, and an audio system (or AVN (Audio, Video & Navigation)) The main components for sound reproduction and output in the system) are the head unit, amplifier, and speaker installed in each position in the vehicle with a built-in microcomputer and DSP (Digital Signal Processor).

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

Meanwhile, while driving a vehicle recently, a storage medium such as a USB or a memory of a smart device may be connected to the vehicle to play a sound source or listen to media music using Bluetooth.

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

In addition, when listening to the radio, broadcasting is mainly focused on talk and music. Currently, mass-produced car audio systems provide broadcast sound quality regardless of the type of broadcast represented by talk and music, or optimal for some models. Equalizer function is provided so that broadcast sound quality can be output.

That is, the driver selects and sets the broadcast equalizer (EQ) mode as one of preset modes such as talk, jazz, and classic, and outputs broadcast sound quality according to the set equalizer mode. (According to the set equalizer value, perform sound correction).

To explain this in more detail, some high-end audio systems provide the equalizer mode setting function, and when the user directly sets the equalizer mode to talk, jazz, classic, rock, pop, etc. When sound is output, sound quality in a set mode is provided.

For example, when the user selects the talk mode, the micom of the audio system reduces the bass / treble and increases the clarity of the broadcast voice by utilizing the midrange, and when selecting the music, the bass / treble is utilized to output the sound with a sense of sound.

However, while the user has set the talk mode, music may be played while broadcasting, and in this case, since the bass and treble of the music are reduced, it will sound frustrating to the user when listening.

On the other hand, if the user selects the music mode, in the case of a talk broadcast, the intelligibility of the human voice must be reduced and the broadcast must be listened to.

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

If the user wants to receive the desired broadcasting sound quality, it is necessary to change the equalizer mode according to the type of broadcasting or adjust the equalizer value each time.Especially, it is difficult to change and operate the equalizer in real time in the situation of alternating music and talk during broadcasting. impossible.

Therefore, the present invention was created to solve the above problems, and in the output of AM / FM radio broadcasts, it is possible to distinguish and recognize the types of broadcasts represented by talk and music to output the optimal sound quality according to the types of broadcasts. The purpose of the present invention is to provide an equalizer control method for an audio system.

In addition, an object of the present invention is to provide a method capable of providing an optimal broadcast sound quality by actively automatically adjusting an equalizer setting value according to a broadcast type.

In order to achieve the above object, the present invention, receiving a radio signal of an AM or FM broadcast via an antenna; Receiving at least one of an intermediate processing signal in a tuner generated in the process of processing the received AM or FM radio signal and an analog signal finally output from a digital signal processor (DSP) to an amplifier; Analyzing one or more of the input intermediate processing signal and an analog signal to distinguish and recognize a broadcast type of the received radio signal; Adjusting an equalizer value to a value according to the recognized broadcast type; And it provides a method for controlling the equalizer of the audio system comprising the step of controlling the sound output through the amplifier and the speaker according to the adjusted equalizer value.

Here, the broadcast type of the recognized radio signal is one of talk and music, and when adjusting the equalizer value, any one of a talk mode and a music mode in which the equalizer value is preset as a preset mode is used for sound output. It is characterized by being selected as an equalizer mode for control.

In addition, the intermediate processing signal is an intermediate frequency band IF (Intermediate Frequency) modulated signal converted from a radio signal by the tuner, and the strength of the IF modulated signal is set by distinguishing and recognizing the broadcast type of the received radio signal. When compared to the set strength is higher than that, it is characterized in that the type of radio signal is recognized as music.

In addition, when the strength of the IF modulated signal is less than the preset strength, it is characterized in that the broadcast type of the radio signal is recognized as a talk.

In addition, when there is a frequency component above the set frequency among the frequencies of the analog signal in the DSP, it is characterized in that it recognizes the type of radio signal as music.

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

In addition, the intermediate processing signal is an intermediate frequency band IF (Intermediate Frequency) modulated signal converted from a radio signal by the tuner, and in the step of recognizing and distinguishing the broadcast type of the received radio signal, the strength of the IF modulated signal is determined. Recognizing the broadcast type of a radio signal as a talk when both conditions less than a preset strength compared to a preset strength and conditions where only a frequency component below a preset frequency among the frequencies of the analog signals in the DSP are satisfied are satisfied. It is characterized by.

In addition, when one of the two conditions is not satisfied, the broadcast type of the radio signal is classified as music.

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

1) In the output of AM / FM radio broadcasting, it is possible to provide the optimal broadcasting sound quality by distinguishing and recognizing the type of broadcasting such as talk or music and automatically setting the equalizer mode according to the broadcasting type.

2) Even when talk and music alternately occur in a radio broadcast, the user can always listen to the optimal broadcast sound quality by automatically switching to the optimal equalizer mode corresponding to the broadcast type in real time during broadcast.

3) It is possible to provide optimal broadcasting sound quality by actively automatically adjusting the equalizer setting value according to the broadcasting type.

1 is a block diagram of an audio system for performing an equalizer control method according to the present invention.
2 is a flow chart showing an equalizer control method according to the present invention.
3 is a graph showing the IF modulated signal strength in a tuner according to a broadcast type in the present invention.
Figure 4 is a graph showing the audible frequency in the DSP according to the type of broadcast in the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice.

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

Particularly, in the present invention, an optimal broadcast sound suitable for a broadcast type is made by classifying and recognizing a broadcast type from a radio signal received through an antenna in a vehicle, and then automatically setting or switching to an equalizer mode optimized for the broadcast type, thereby providing the optimal broadcast sound for the broadcast type It can be output through.

Hereinafter, with reference to the drawings, FIG. 1 is a configuration diagram of an audio system that performs the equalizer control method according to the present invention, and FIG. 2 is a flowchart illustrating the equalizer control method according to the present invention.

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 showing audible frequency in a DSP according to a broadcast type in the present invention.

First, referring to FIG. 1, it shows a configuration of an audio system to which an equalizer control method according to the present invention is applied, and more specifically, an antenna 10 for an AM / FM radio (RF) broadcast signal in a vehicle. It shows the configuration of a radio system that receives through and processes the received broadcast signal to output sound through the speaker 60.

As illustrated, the audio system includes an antenna 10 for receiving AM / FM radio (RF) signals, and a low noise amplifier (LNA) 20 for amplifying and outputting a radio signal received through the antenna 10 with low noise. ), A tuner 30 that selects and outputs a signal of a set broadcast frequency band among signals output from the LNA 20, processes a digital signal from the signal output from the tuner 30, and finally converts it to an analog sound signal DSP 40 for output, an amplifier 50 for amplifying the analog sound signal output from the DSP 40, a speaker 60 for outputting the signal amplified by the amplifier 50 as sound, and each component And a microcomputer 70 that controls the operation of the element.

Here, there is no difference in the basic functions performed by each of the above components until the vehicle receives a radio signal, processes it, and outputs the speaker 60, and as each of these components, as a known element of the radio system Since the configuration is clear, further detailed description is omitted.

The signal processing process in the tuner 30 that outputs a radio signal converted to a set frequency among the above-described components processes a radio signal that has passed through the LNA 20, that is, an intermediate frequency band signal, that is, an IF (Intermediate Frequency) modulation signal. Converting to, and the signal processing in the tuner 30 is a known signal processing performed for radio sound output.

However, in the present invention, the RF modulation component in the tuner 30 is analyzed. More specifically, the IF modulated signal converted from the RF signal in the tuner 30 is analyzed by the microcomputer 70 to broadcast talk, music, and the like. You will recognize the type.

In addition, the DSP 40 converts the signal output from the tuner 30 into a digital signal, and after a predetermined signal processing process, finally converts the analog signal to an analog signal and outputs it to the amplifier 50. The amplifier 50 amplifies the output analog signal and outputs it through the speaker 60.

The signal processing process in the DSP 40 is a known process, but in the present invention, the audible frequency of the analog signal finally output from the DSP 40 to the amplifier 50 can be analyzed to be configured to classify broadcast types. .

As described above, in the present invention, the intermediate processing signal generated in the process of processing the AM / FM radio signal received through the antenna 10 or the analog signal processed by the DSP 40 and finally output to the amplifier 50 is analyzed and broadcast. You will be sorted.

Referring to FIG. 3, the tuner 30 shows the strength of an IF modulated signal, and considering that the size of the IF modulated signal with respect to the RF signal is a difference between a talk and a music broadcast, the micom 70 is shown in FIG. 3 By receiving the IF modulated signal of the tuner 30 shown in the figure and analyzing its strength, the types of broadcasting represented by talk and music are distinguished.

In the broadcasting station, the size of the modulation rate of the RF signal is different to increase the sound field when it is a music broadcast. For music, the FM broadcast uses a modulation rate of 50% or higher, and the AM broadcast uses a modulation rate of 50% or higher.

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

Therefore, it is possible to distinguish between talk and music from the size of the IF modulated signal, and when analyzing the IF modulated signal by setting the signal size capable of distinguishing the talk and music as the set intensity value, the broadcast type can be recognized by talk or music. .

For example, when the set intensity is set to 0.6, if the intensity of the IF modulated signal is greater than or equal to 0.6, the type of broadcast may be recognized as music, and when less than 0.6, the broadcast type may be recognized.

Accordingly, according to the present invention, the micom 70 compares the strength of the IF modulated signal transmitted from the tuner 30 to music when it is higher than the set strength, and if it is less than that, it is classified and recognized as music, and music as an equalizer mode Among the preset modes of and talk, any one of the recognized broadcast types is selected to control the sound output through the speaker 60 in the selected equalizer mode.

Here, the contents of controlling the sound output according to the selected preset mode are well-known technical matters, and thus detailed description thereof will be omitted.

That is, controlling the sound output in the selected equalizer mode means correcting and outputting the sound corresponding to the equalizer value of the selected mode, and for controlling the sound output corresponding to the equalizer value in a normal audio system. It is a technical matter of the public notice being applied.

In addition, referring to FIG. 4, the audible frequency for the analog signal in the DSP 40 is shown, and focusing on the difference between the audible frequency band of the talk and the music (when in torque, there are almost no components above 5 kHz in the human voice) ), By analyzing the audible frequency of the DSP 40 shown in Figure 4 in the micom (70) may be configured to distinguish and recognize the type of broadcast.

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

Therefore, if the frequency capable of distinguishing between talk and music is appropriately set, the torque and music can be distinguished and recognized based on the set frequency value.

For example, when the set frequency is set to 5 kHz, when a frequency component of 5 kHz or more among the audible frequencies in the DSP 40 is present, it can be recognized as music, and when only a frequency component of less than 5 kHz is present, a broadcast type can be recognized.

Therefore, in the present invention, the micom 70 analyzes the frequency component of the analog signal transmitted from the DSP 40, but if there is a frequency component above the set frequency, it is music, and if there is only a frequency component below the set frequency, it is divided into torque. And recognizes, and also selects one mode corresponding to the recognized broadcast type among the preset modes of music and talk as an equalizer mode, and controls the sound output through the speaker 60 in the selected equalizer mode.

In addition, as described above, it is possible to classify the broadcast type by analyzing the signal from the tuner 30 or the signal from the DSP 40 alone, but in order to improve accuracy, the two signals are used in combination to distinguish the modes. It is also possible to do.

Referring to FIG. 2, after modulating the strength of the modulated signal in the tuner 30 after radio ON (S11) with a set strength (eg, 0.6) (S12), when the set strength is greater than or equal to, the broadcast type is recognized as music. The equalizer mode is set to the music mode (S14).

At this time, when the modulated signal strength is less than the preset strength, the analog signal audible frequency component of the DSP 40 is analyzed (S13), and if a frequency component higher than the set frequency (eg, 5 kHz) exists, it is music. If it is present, it is recognized as torque, and when recognized as music, the equalizer mode is set to music mode (S14), and if recognized as torque, the equalizer mode is set to talk mode (S15).

Eventually, the sound output is controlled in the equalizer mode selected according to the broadcast type through the above-described logic, and the above-described logic is applied to the received radio signal to classify and recognize the broadcast type in real time, and the broadcast type varies. In the case, real-time switching to the equalizer mode corresponding to the recognized broadcast type is performed.

In the above description, the selection and switching of the preset mode has been explained. In this case, the preset mode is a mode in which the equalizer (EQ) value is preset according to the type of broadcast so that optimal sound output and sound quality can be provided. To increase the intelligibility of the voice, it is possible to set the equalizer value so that the bass and treble are reduced and the midrange is strengthened. In the case of music, it is possible to set the equalizer value to enhance the bass and treble.

In this case, when the user listens to the radio, the voice can be clearly heard, and the music can be heard using the sound field, so that satisfaction with listening to the radio can be improved.

The embodiments of the present invention have been described in detail above, but the scope of rights of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims. The form is also included in 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 one or more of an intermediate processing signal in a tuner generated in the process of processing the received AM or FM radio signal, and an analog signal finally output from a digital signal processor (DSP) to an amplifier;
Analyzing one or more of the input intermediate processing signal and an analog signal to distinguish 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 sound output through the amplifier and the speaker according to the adjusted equalizer value,
The intermediate processing signal is an IF (Intermediate Frequency) modulated signal of an intermediate frequency band converted from a radio signal by the tuner, and the strength of the IF modulated signal is compared with a set intensity in the step of distinguishing and recognizing the broadcast type of the received radio signal The equalizer control method of the audio system, characterized by recognizing the broadcast type of the radio signal as music when the preset strength is greater than or equal to the preset strength.
The method according to claim 1,
Broadcast type of the recognized radio signal is one of talk and music, and when adjusting the equalizer value, one of the talk mode and the music mode in which the equalizer value is preset as a preset mode controls the control of the sound output. Equalizer mode for controlling the equalizer control method of the audio system, characterized in that selected.
delete The method according to claim 1,
When the strength of the IF modulated signal is less than a preset strength, an equalizer control method of an audio system, characterized in that a broadcast type of a radio signal is recognized as a talk.
The method according to claim 1 or claim 2,
A method of controlling an equalizer in an audio system, characterized in that a broadcast component of a radio signal is recognized as music when a frequency component equal to or greater than a set frequency is present among the frequencies of the analog signal in the DSP.
The method according to claim 5,
A method of controlling an equalizer in an audio system, characterized in that, when only a frequency component below a set frequency is present among the frequencies of the analog signal, a broadcast type of the radio signal is recognized as a talk.
The method according to claim 1 or claim 2,
The intermediate processing signal is an intermediate frequency band IF (Intermediate Frequency) modulated signal converted from a radio signal in a tuner,
In the step of distinguishing and recognizing the broadcast type of the received radio signal,
Talk to the broadcast type of the radio signal when both the condition of the set strength is less than the set strength by comparing the strength of the IF modulated signal and the condition that only the frequency component of the analog signal in the DSP is less than the set frequency exists. Equalizer control method of the audio system, characterized in that recognized as (talk).
The method according to claim 7,
If one of the two conditions is not satisfied, the equalizer control method of the audio system, characterized in that the broadcast type of the radio signal is divided into music.

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