CN1275496C - System and method for automatically adjusting frequency response equalization of speakers - Google Patents

Abstract

The invention discloses a system and a method for automatically carrying out frequency response equalization adjustment on a loudspeaker, wherein the system comprises the loudspeaker, a central processing unit, a sound effect control circuit, a digital equalizer and a microphone; the central processing unit generates a standard sound source signal through the sound effect control circuit, the digital equalizer outputs the standard sound source signal through the loudspeaker after receiving the standard sound source signal, the standard sound source signal is received by the microphone and then is transmitted back to the central processing unit through the sound effect control circuit, the received sound signal is compared with the set ideal frequency response data through frequency response, a group of equalization adjustment gain values are calculated and stored in the digital equalizer, so that the frequency response adjustment is automatically carried out on the loudspeaker, and the output sound signal is kept in the optimal frequency response state.

Description

System and method for automatically adjusting frequency response equalization of speakers

technical field

The present invention relates to the adjustment of the frequency response of the speaker, especially a system and method for automatically adjusting the frequency response equalization of the speaker; when a speaker is installed in an electronic device, a central processing unit set in the electronic device A set of equalizing gain values can be calculated in real time and stored in a digital equalizer, so that the equalizer can automatically adjust the frequency response of the speaker according to the gain values in the future.

Background technique

In recent decades, due to the rapid development of the technology industry, the pace of people's life and work has been accelerated along with the fierce market competition. The convenient and fast transportation facilities have also gradually expanded the area for industrial and commercial development. People's daily busy schedule , in order to improve work efficiency and improve the quality of life, the degree of dependence on electronic devices such as electronic dictionaries, electronic notebooks, personal digital assistance (personal digital assistance) and mobile phones (mobile phone) is increasing day by day. At present, these electronic devices have not only become indispensable tools for people's work, but also become a part of some people's daily life. Therefore, ensuring that these devices have good sound quality has become a basic requirement that common users or communication service providers pay close attention to.

In recent years, various electronic devices such as electronic dictionaries, electronic notebooks, personal digital assistants, and mobile phones can provide people with some necessary information in daily work and life, regardless of whether the electronic devices are electronic dictionaries, electronic notebooks, etc. , personal digital assistants or mobile phones, the voice information output by them is played out through a speaker installed in these electronic devices, so for users who often use these devices, the sound effects of these electronic devices The quality of the output has become the basic requirement of general users.

In view of this, at present, after installing a speaker in the electronic device, the designers and manufacturers of these electronic devices will compare the frequency response between the frequency response produced by the speaker and the expected best sound effect. Yes, and by adjusting the resistance and capacitance on the equalizer circuit (equalizer), the speaker can obtain an appropriate gain value (gain), effectively correcting the frequency response of the speaker output, so that it can be heard by ordinary people Within the frequency range (20Hz ~ 20KHz), the best sound effect is produced.

Traditionally, when performing equalization tuning (equalization tuning) in each frequency range on the speakers installed on such electronic devices, the output sound effects in each sampling frequency range are generally tested by testing instruments, and then used Manually, repeatedly adjust the resistance and capacitance values of the connected equalization circuit so that the speaker can produce the most ideal output frequency response. However, this adjustment method is not only tedious and tedious, time-consuming and labor-intensive, but also requires a lengthy adjustment operation when the speakers are replaced on the electronic device, which easily makes the staff feel bored and perfunctory. As a result, the quality of the adjustment operation varies from person to person, and cannot be maintained at a certain quality control level, which troubles the designers and manufacturers of these electronic devices.

In recent years, some companies have developed a digital equalizer to solve this problem effectively. However, when these operators perform equalization tuning (equalization tuning) in each frequency range to the speakers installed on these electronic devices, they still test the output sound effects in each sampling frequency range by testing equipment, and then The calculated gain value that should be adjusted is input into the digital equalization circuit, so that the digital equalization circuit can make the speaker produce the most ideal output frequency response. This method does not effectively improve the lengthy test procedure, and in the When the speaker of the electronic device is replaced again, it is still necessary to repeat the test procedure again, resulting in unnecessary waste of manpower and time.

Contents of the invention

In order to overcome many problems that occur when equalization tuning in each frequency range is performed when the speaker is installed on the electronic device of the prior art, the present invention proposes a system for automatically performing frequency response equalization tuning on the speaker and method, the main purpose of the present invention is to automatically detect and calculate the equalization adjustment gain value within the auditory frequency range, so that the equalizer can automatically adjust the frequency response of the speaker according to the gain value Adjustment.

The system for automatically adjusting the frequency response equalization of the loudspeaker of the present invention includes: a loudspeaker, a central processing unit (CPU), a sound effect control circuit, a digital equalizer, and a microphone.

The method for automatically adjusting the frequency response equalization of the loudspeaker of the present invention is realized in the following way: After installing a loudspeaker in an electronic device, a central processing unit (CPU) provided thereon is used to pass through a sound effect control circuit (audio controller) to generate a standard sound source signal with an appropriate bandwidth range, so that a digital equalizer (digital equalizer) set in it can pass the standard sound source signal according to its initial gain value (gain) after receiving the standard sound source signal The loudspeaker outputs the sound source signal, and after being received by a microphone set in the electronic device, it is sent back to the central processing unit through the sound effect control circuit, so that the central processing unit combines the received sound signal with the set Compare the frequency response (frequency response) with the given ideal frequency response data, calculate a set of equalization tuning gain (equalization tuning gain) within the bandwidth range, and input the adjustment value to the digital equalizer Internal storage, so that the equalizer can automatically adjust the frequency response of the speaker according to these adjustment values in the future, so that the output sound signal can be kept in the best frequency response state.

After applying the system and method for automatically adjusting the frequency response equalization of the speaker of the present invention, after the installation of the speaker is completed, the operator does not need to perform tedious and tedious tests on the output sound effects in each sampling frequency range through the test instrument program, or repeatedly adjust the resistance and capacitance values, the output sound signal of the speaker can be kept in the best frequency response state.

Description of drawings

The following is a description of the accompanying drawings of the present invention:

Shown in Fig. 1 is the block diagram of circuit structure of the present invention;

Shown in Fig. 2 is the operation flow schematic diagram of the present invention;

Shown in Fig. 3 is the frequency response schematic diagram of an ideal frequency response data among the present invention;

Shown in Fig. 4 is the frequency response schematic diagram of a standard sound source data among the present invention;

FIG. 5 is a schematic diagram of the frequency response of digital audio data measured before the frequency response compensation of the speaker in the present invention.

Description of main component parameters in the figure:

Speaker 10 Central processing unit 20 Sound effect control circuit 30

Digital equalizer 40 Microphone 50

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing:

First referring to Fig. 1, after a speaker 10 is installed in an electronic device, a central processing unit 20 set in the electronic device is used to simulate and generate a standard sound source file in the range of an auditory bandwidth (20Hz-20KHz) , and send the sound source file to a sound effect control circuit 30, and the sound effect control circuit 30 generates a standard sound source signal corresponding to the frequency range according to the data of the sound source file, and sends the sound source signal to the electronic device A digital equalizer 40 is provided. After receiving the sound source signal, the digital equalizer 40 performs initial compensation on the sound source signal according to an initial gain value preset therein, and then passes through the loudspeaker 10 to The sound source signal is output, and after a microphone 50 installed in the electronic device receives the sound source signal output by the speaker 10, the received sound source signal will be passed back to the central unit through the sound effect control circuit 30 The processing unit 20 enables the central processing unit 20 to compare the frequency response of the received sound source signal with the set ideal frequency response data, and calculate the frequency response of the speaker 10 within the frequency range. A group of equalization adjustment gain values for compensation, and the obtained adjustment value is input into the digital equalizer 40 for storage, so that the equalizer 40 can automatically adjust the frequency of the speaker according to these adjustment values in the future. The adjustment of the response keeps the output audio signal in the best frequency response state.

In the present invention, when the central processing unit 20 performs frequency response compensation for the loudspeaker 10 installed in the electronic device according to a software designed therein, as shown in FIG. For the speaker 10 to be installed, according to its specifications, the ideal frequency response data in the range of auditory bandwidth (20Hz～20KHz) is designed, referring to the frequency response diagram of the ideal frequency response data shown in Figure 3, and these data It is stored in a memory set in the electronic device, and a set of standard sound source data within the range of auditory bandwidth (20Hz-20KHz) is stored in the memory. Refer to FIG. 4 for the frequency response diagram of the standard sound source data .

After the loudspeaker 10 is installed in the electronic device, turn on the power of the electronic device, and then see Figure 2, the central processing unit 20 reads the standard sound source data from the memory, and sends it to the sound effect The control circuit 30 makes it generate a standard sound source signal according to the standard sound source data, and compensates it according to an initial gain value preset in it through the digital equalizer 40, and then passes the sound source signal through the loudspeaker 10 Signal output, after the microphone 50 receives the sound source signal, it will be converted into digital audio data through the sound effect control circuit 30; Fig. 5 shows the frequency response diagram of the digital audio data, and the audio data is sent back to The central processing unit 20 .

At this time, the central processing unit 20 will compare the frequency response of the received audio data and the ideal frequency response data according to the sampling frequency one by one, and then, as shown in FIG. A group of equalization adjustment gain values that should be used for frequency response compensation of the speaker 10, and the obtained gain values are input into the digital equalizer 40 for storage, so that the equalizer 40 can be used in the future according to the gain Value, automatically adjust the frequency response of the speaker, so that the output audio signal can conform to the ideal frequency response value shown in Figure 3 within the range of auditory bandwidth (20Hz-20KHz), and keep it at the best frequency response state.

In this way, after the speaker 10 is successfully installed on the electronic device, it is only necessary to turn on the power of the electronic device, and the equalization adjustment gain within the auditory frequency range can be automatically detected and calculated through the aforementioned technology of the present invention. value, so that the equalizer can automatically adjust the frequency response of the speaker according to the adjustment values. Therefore, using the electronic devices of the present invention, after the installation of the speaker is completed, it is completely unnecessary for the operator to pass through the test instrument. For the output sound effects in each sampling frequency range, the output sound signal of the speaker can be adjusted to the best frequency response state through lengthy and tedious test procedures, or repeated adjustment of the resistance and capacitance values on the equalization circuit.

Although the present invention has been described above with examples, the scope of the present invention is not limited thereto, and various changes can be made as long as they do not deviate from the gist of the present invention.

Claims (7)

1. A system for automatically adjusting the frequency response equalization of the speaker, which is installed in an electronic device, is characterized in that: the system includes: A central processing unit, simulating and generating a standard sound source file, which contains a software that can compare the received audio data with the built-in ideal frequency response data, and calculate the equalization adjustment gain value; A sound effect control circuit, connected to the central processing unit, generates a standard sound source signal according to the data of the aforementioned sound source file; A digital equalizer, connected to the audio control circuit and the central processing unit, presets an initial gain value, and can store the aforementioned equalization adjustment gain value, and then automatically adjust the frequency response; A speaker connected to the digital equalizer for outputting an audio signal; A microphone, connected to the speaker and the sound effect control circuit, is used to receive the sound source signal output by the speaker, and transmit it back to the central processing unit through the sound effect control circuit. 2. A method for automatically adjusting the frequency response equalization of a loudspeaker, characterized in that: after installing a loudspeaker in an electronic device, the system utilizes a central processing unit provided thereon to generate a sound effect through a sound effect control circuit. A standard sound source signal with an appropriate bandwidth, so that a digital equalizer set in it can output the sound source signal through the speaker after receiving the standard sound source signal, and a microphone set in the electronic device can output the sound source signal. After receiving, it is sent back to the central processing unit through the sound effect control circuit, so that the central processing unit compares the frequency response of the received sound signal with the set ideal frequency response data, and calculates the frequency response in the frequency range. A set of equalization adjustment gain values in the digital equalizer, and these gain values are input into the digital equalizer for storage, so that the equalizer can automatically adjust the frequency response of the speaker according to these adjustment values, so that the The output audio signal can be kept in the best frequency response state. 3. The method for automatically adjusting the frequency response equalization of the speaker as claimed in claim 2, wherein the electronic device needs to design the speaker within the appropriate frequency range according to the specification of the speaker to be installed. ideal frequency response data, and store the data in a memory provided in the electronic device, so that the central processing unit can, according to a software preset in it, be able to read from the electronic device when the electronic device is activated The data is read from the memory, and then a standard sound source signal with an appropriate bandwidth is generated through the sound effect control circuit. 4. The method for automatically adjusting the frequency response equalization of the loudspeaker as claimed in claim 2, wherein the digital equalizer receives the sound source signal from the sound effect control circuit, and will Set an initial gain value, compensate it, and then output the audio signal through the speaker. 5. The method for automatically adjusting the frequency response equalization of the speaker as claimed in claim 2, wherein the sound effect control circuit converts the sound source signal from the microphone into digital audio data , and pass it back to the central processing unit. 6. The method for automatically adjusting the frequency response equalization of the speaker as claimed in claim 2, wherein the central processing unit, according to the sampling frequency, for the received audio data and the original output standard sound source data, Compare the frequency responses one by one, and calculate a set of equalization adjustment gain values for the speaker to perform frequency response compensation within each sampling frequency range, and input the obtained gain values into the digital equalization stored in the device. 7. The method for automatically adjusting the frequency response equalization of the speaker as claimed in claim 2, 3, 4, 5 or 6, wherein the standard sound source signal with an appropriate bandwidth can be an auditory bandwidth of 20Hz- Standard audio files in the range of 20KHz.

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