• Title/Summary/Keyword: audio equalizer

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Automatic Equalizer Control Method Using Music Genre Classification in Automobile Audio System (음악 장르 분류를 이용한 자동차 오디오 시스템에서의 이퀄라이저 자동 조절 방식)

  • Kim, Hyoung-Gook;Nam, Sang-Soon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.8 no.4
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    • pp.33-38
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    • 2009
  • This paper proposes an automatic equalizer control method in automobile audio system. The proposed method discriminates the music segment from the consecutive real-time audio stream of the radio and the equalizer is controlled automatically according to the classified genre of the music segment. For enhancing the accuracy of the music genre classification in real-time, timbre feature and rhythm feature extracted from the consecutive audio stream is applied to GMM(Gaussian mixture model) classifier. The proposed method evaluates the performance of the music genre classification, which classified various audio segments segmented from the audio signal of the radio broadcast in automobile audio system into one of five music genres.

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Implementation of an Intelligent Audio Graphic Equalizer System (지능형 오디오 그래픽 이퀄라이저 시스템 구현)

  • Lee Kang-Kyu;Cho Youn-Ho;Park Kyu-Sik
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.43 no.3 s.309
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    • pp.76-83
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    • 2006
  • A main objective of audio equalizer is for user to tailor acoustic frequency response to increase sound comfort and example applications of audio equalizer includes large-scale audio system to portable audio such as mobile MP3 player. Up to now, all the audio equalizer requires manual setting to equalize frequency bands to create suitable sound quality for each genre of music. In this paper, we propose an intelligent audio graphic equalizer system that automatically classifies the music genre using music content analysis and then the music sound is boosted with the given frequency gains according to the classified musical genre when playback. In order to reproduce comfort sound, the musical genre is determined based on two-step hierarchical algorithm - coarse-level and fine-level classification. It can prevent annoying sound reproduction due to the sudden change of the equalizer gains at the beginning of the music playback. Each stage of the music classification experiments shows at least 80% of success with complete genre classification and equalizer operation within 2 sec. Simple S/W graphical user interface of 3-band automatic equalizer is implemented using visual C on personal computer.

Design of the 5-band Digital Audio Graphic Equalizer adopted Automatic Gain Controller (자동 이득 제어기를 적용한 5-밴드 디지털 오디오 그래픽 이퀄라이저 설계)

  • 김태형;김환용
    • Journal of the Korea Computer Industry Society
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    • v.3 no.1
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    • pp.27-34
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    • 2002
  • There is much interest on information communications owing to the rapid development of network and IT(Information Technology). Analog signals are converted into digital signals for information communications. However, it is very difficult to completely erase the distortion induced during the conversion of analog signals such as voices and images into digital signals. Existing audio graphic equalizer requires very complex processes to calculate the gain and coefficients of the higher-order filter which is required to generate natural sound and to satisfy the need of each person. Unfortunately it is uneconomical and very difficult to embed the existing digital audio equalizer in the system because of the complexity of the existing digital audio equalizer for high quality sound. This paper discusses the design of a new digital audio graphic equalizer(DAGEQ) which can improve system performance and the quality of audio sound, and can be embedded in the system. This new DAGEQ is designed so that the gain can be controlled automatically. The automatic control of coefficients and gain empowers real time processing and the improvement of audio quality.

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A study on the hearing characteristic based equalizer design for the elderly (고령층의 가청주파수 특성을 고려한 이퀄라이저 연구)

  • Lee, Chul-Hee;Hong, Sung-Kyoo
    • Journal of Digital Contents Society
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    • v.19 no.4
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    • pp.779-787
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    • 2018
  • This study delves into how the equalizer can compensate for a sound pressure of lost frequencies. The targeted audiences are senior citizens who have difficulties hearing high-frequency because of a decline of audio frequency. Through investigations, this study confirms that the reason why reduction of high-frequency hearing increases depending on senescence. By considering the features of audio frequency of senior citizens, it also clarifies the necessity of equalizer reflecting features of audio frequency for the senior citizens, which have dramatically increased in Korea. There are application programs having functions, which provide several options of equalizer setup that people can adjust it depending on their own audio frequency. Some of them provide different equalizer setup depending on age. This study, however, reveals that they are not fully enough to compensate for the range of hearing loss of the senior citizens. Therefore, by pointing out limitations of existing functions and suggesting improvements, this study explores the way of improvements that enhance the sound transmissions of digital media contents for senior citizens.

A time-shared multiplier designed for the ASIC implementation of multi-channel audio equalizer (다 채널 오디오 이퀄라이저의 ASIC구현을 위한 시분할 공유 곱셈기 구조에 관한 연구)

  • Kim Chong-Yun;Lee Jae-Sik;Kim Jae-Hwa;Chang Tae-Gyu
    • Proceedings of the Acoustical Society of Korea Conference
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    • spring
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    • pp.343-346
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    • 2000
  • This paper presents a filter bank designed for the multi-channel audio equalizer. A time-shared multiplier is also proposed to implement the equalizer with a minimum number of gates when it is synthesized with ASIC or FPGA. Further reduction of the number of required gates is achieved by designing the multiplier based on a cascaded sequential circuit utilizing partial multiplications. The equalizer is realized with FPGA and its real-time operation verifies the reliability and high fidelity of the designed system.

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A system for recommending audio devices based on frequency band analysis of vocal component in sound source (음원 내 보컬 주파수 대역 분석에 기반한 음향기기 추천시스템)

  • Jeong-Hyun, Kim;Cheol-Min, Seok;Min-Ju, Kim;Su-Yeon, Kim
    • Journal of Korea Society of Industrial Information Systems
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    • v.27 no.6
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    • pp.1-12
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    • 2022
  • As the music streaming service and the Hi-Fi market grow, various audio devices are being released. As a result, consumers have a wider range of product choices, but it has become more difficult to find products that match their musical tastes. In this study, we proposed a system that extracts the vocal component from the user's preferred sound source and recommends the most suitable audio device to the user based on this information. To achieve this, first, the original sound source was separated using Python's Spleeter Library, the vocal sound source was extracted, and the result of collecting frequency band data of manufacturers' audio devices was shown in a grid graph. The Matching Gap Index (MGI) was proposed as an indicator for comparing the frequency band of the extracted vocal sound source and the measurement data of the frequency band of the audio devices. Based on the calculated MGI value, the audio device with the highest similarity with the user's preference is recommended. The recommendation results were verified using equalizer data for each genre provided by sound professional companies.

Noise analysis and simulation of the audio circuits (Audio 회로의 잡음해석과 시뮬레이숀)

  • 차균현;이근철
    • 전기의세계
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    • v.29 no.12
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    • pp.798-803
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    • 1980
  • A computer program for noise analysis of the audio circuit is developed. The application of the program to the equalizer, low frequency amplifier of radio circuit and cascaded amplifier show good results. The general noise analysis method for cascade operational amplifier is presented. The noise spectral power density is calculated for a resonator active filter.

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The Analysis of Equaizer for Improving Sound Quality of Samrtphones (스마트폰의 음질 향상을 위한 Equalizer 분석)

  • Lee, Myung-hwan;Ryu, Chang-su
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.05a
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    • pp.190-193
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    • 2013
  • Before Smartphone releases, playing music form previous cellphone is very limited, so we need mp3 player instead. However, when Smartphone releases, a function of playing multimedia became one of the important things in Samrtphone including all functions of mp3 player. Even though it is easier to use since you can play music and multimedia in one device, it still has problem issues on the sound quality. This thesis will discuss about functions of EQ from Smartphone music players. After that, we will to achieve high fidelity sound through balance adjustment of Right Mark Audio Analyzer program.

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Analysis of Terrestrial DTV Field Test Results (지상파 DTV 현장측정 결과분석)

  • 조진호;김종호;권오형;김태균
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1999.11b
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    • pp.155-159
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    • 1999
  • This paper represents analysis of terrestrial DTV field test results over Taejon city area. Thirty three points were selected as measuring points. Signal power, noise power, Segment Error Rate (SER) and equalizer performance was measured. DTV video & audio quality was good over half of test sites. Equalizer could correct signal ghost and improve S/N up to 13.7dB.

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Fast Graphic Visualization of Frequency Response for Audio Equalizer (오디오 이퀄라이저를 위한 주파수 응답의 고속 그래픽 표현 방법)

  • Kim, Ki-Jun;Park, Hochong
    • Journal of Broadcast Engineering
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    • v.20 no.4
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    • pp.632-640
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    • 2015
  • This paper proposes a new method for fast graphic visualization of accurate frequency response of audio equalizer (EQ). When a logarithmic frequency scale is used, a frequency response in high resolution is required for accurate low-band frequency response. However, the high-resolution frequency response requires a huge amount of computational load, which makes the real-time graphic visualization of frequency response impossible. In order to solve the problem of computational load, the proposed method utilizes a low-resolution virtual frequency response in the mid band. It first computes the virtual frequency response of each filter of EQ in the mid band, and then moves it to the target band so that the result corresponds to the desired filter response. Then, it determines the final frequency response of EQ by combining all filter responses. The experiments confirm that the proposed method provides the frequency response of EQ which has an equivalent shape to that computed in high frequency resolution with huge computational load.