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Amplifier in audio system

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Audio amplifiers are devices used to increase the amplitude of an audio signal, thereby increasing its loudness when played through speakers. They are an essential component of sound systems and have evolved over time. Class D power amplifiers, such as those based on GaN devices, are becoming popular due to their high power efficiency and fidelity . The audion, developed in the early 20th century, was one of the first amplifiers used for radio signals . Recent advancements include the development of high-fidelity and high-efficiency digital class-D audio power amplifiers, which utilize closed-loop negative feedback and loop-filtering technologies to minimize distortion . Different audio amplifiers, such as LM386, LM358N, and LM3886, have been analyzed for their efficiency and power gain factor . Additionally, there have been efforts to control the power consumption and temperature generated by audio amplifiers using advanced control algorithms and integrated circuits .

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Open access•Journal Article•DOI Comparative Study of Audio Amplifiers Vimal Raj, Aravindan S, Agnishwar Jayaprakash, Harith M, Manivannan R, Bhuvaneshwaran G - Show less +5 more 01 Jan 2017-IOSR Journal of Electronics and Communication Engineering 4 Citations	The paper discusses different audio amplifiers, including the LM386, LM358N, LM3886, and TIP series amplifiers, and compares their efficiency and power output.
Open access•Journal Article•DOI Smart audio amplifier Josue Zarate, Enrique Muñoz C, C Ruben Diaz - Show less +2 more 04 Jan 2016-European Scientific Journal, ESJ	This project focuses on the control of audio power amplifiers, optimizing power consumption and temperature using a control algorithm.
Open access•Journal Article•DOI The Class D Audio Power Amplifier: A Review Shangming Mei, Yihua Hu, Hui Xu, Huiqing Wen - Show less +3 more 09 Oct 2022-Electronics 1 Citations	The audio power amplifier is an essential component of a sound system, designed to increase the power of the input signal.
Open access•Journal Article•DOI The invention of a tube audio amplifier Victor M. Pestrikov 01 Jan 2019	The invention of the audio frequency amplifier by Fritz Lowenstein in 1912 played a significant role in the development of vacuum tube technology in the 1920s.
Open access•Journal Article•DOI High-Fidelity and High-Efficiency Digital Class-D Audio Power Amplifier Wei Cong, Wu Jianhan, Rongshan Wei, He Minghua - Show less +3 more 13 Apr 2021-Journal of Electrical and Computer Engineering 1 Citations	The study presents a high-fidelity and high-efficiency digital class-D audio power amplifier for audio systems.

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What is an Amplifier and Audio Playback.?5 answersAn amplifier is a device that increases the amplitude of an audio signal. It can be used to boost the power of the signal, allowing it to be heard at higher volumes. Amplifiers can be classified into different types, such as class-D amplifiers, which use switching transistors to amplify the signal. On the other hand, audio playback refers to the process of reproducing sound or music from a device. A sound and music playback device typically includes an output amplifier, a power supply circuit, and an output signal level judging circuit. In an audio playback device, the attenuation control unit is responsible for controlling the attenuation of audio data in each channel to maintain a relationship between channels and prevent the total current value from exceeding a prescribed value.

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