What is audio amplification? The principle of operation and use with the sound system

In the process of using audio devices, you often hear the term sound amplification but do not know what it means and how it works. So let’s find out with lassho.edu.vn right away what is sound amplification? The principle of operation and use with the sound system in the following article!

Learn about audio amplification

What is audio amplification?

Audio amplifier, also known as amplifier, power amplifier is a type of electronic amplifier. They have the effect of amplifying low-power signal sounds to produce high-power electrical signal sound, which helps to operate special equipment and components suitable for sound reproduction equipment. from that energy.

Audio amplifiers are often located to receive signal sources such as microphones, sound sensors in musical instrument boxes, CDs, Cassette tapes, even the detector circuit of radio and television receivers.

Usually, the audio frequency ranges are conventionally from 20Hz to 20kHz, there are even wide audio amplifier circuits up to 40kHz with the effect of amplifying the Stereo signal.

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What is an audio amplifier? Classification by location in sound recording and reproduction systems

Classification of audio amplifiers will have each position in the sound recording and reproduction system as follows:

• Amplifier or power amplifier is used to only amplify with high output power from tens of mW to kW and then output the signal to headphones, speakers, … to reproduce the sound. Some amplifiers are limited to low frequencies above 20Hz, depending on the sound reproduction of the speaker.
• Amplify the voltage in the audio frequency range to produce an output signal to the ADC signal digitizer circuit, the circuit is used to analyze the sound to control black bars or sprinklers to create light and ray effects. water.
• Preamplifier is placed at the signal source such as microphone, sound sensor to increase the signal to transmit to the receiving device.

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What is an audio amplifier circuit?

Audio amplifier circuit consists of 3 main amplifier circuits which are voltage amplifier circuit, current amplifier circuit, power amplifier circuit. In a power amplifier circuit, there are both voltage amplifiers and current amplifiers. Therefore, the audio amplifier circuit can be understood as a power amplifier circuit.

Power amplifier circuits possess many types, in which the audio amplifier circuit is one of the commonly used circuits today.

History of sound amplifiers

The sound amplifier was invented in 1990 by Mr. Lee De Forest at the same time he was inventing the vacuum electronic bulb triode.

The triode is a 3-pole device and comes with a control plate that measures the flow of electrons from the filament to the plates. The vacuum triode amplifier was used on the first AM radio.

Audio power amplifiers often operate on vacuum tubes, these types of machines often operate with high quality.

Today’s audio-enabled devices are mostly based on hardware-based devices. However, some customers today still prefer products that use vacuum amplifiers.

Working principle of audio amplifier circuit

The voices, vocals, and other sound waves in the sound will be passed through the microphone, the diaphragm of the microphone will be converted into an electrical signal. The oscillating electrical signal will represent the dilution and pressure of the original sounds. Then, thanks to the CD’s function, the recorder will encode the signal.

The transmitter will record the decoded signal and transmit it to the speaker. The change in pressure will cause the speaker to regenerate as it was originally done.

The operating principle of the audio amplifier circuit can be understood simply as the synthesis of a multi-channel audio mixer for different audio channels. The audio will be free from negative noise because each signal will be fed to a resistor, the other end will be connected to the ‘GND’ terminal.

The two main signals generated during audio amplification are the input signal and the output signal . These two signals have completely different functions and activities.

The output signal is processed by the components of the amplifier circuit. When the output signal changes, the resistance changes to create a new voltage fluctuation compared to the original audio signal.

However, the load to transmit the new sound is very large, so it is necessary to use the support of the preamplifier to ensure the operation.

Uses of amplifiers with sound systems

The use of an amplifier with a sound system is a system to transmit audio signals from inputs such as USB, phones, DVD players or some fairly large audio storage devices. The amplifier itself will convert the signal into the amplifier.

In the past, amplifiers were often used separately by customers for different purposes. However, now with the development of electronic equipment technology, amplifiers have been manufactured and integrated into devices. It is because the integration has saved costs for customers to use.

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Types of popular audio amplifiers today

Sort by function

Most audio amplifiers are classified by function including voltage amplifiers and power amplifiers .

The input signal of the amplifier controls the output volume of the amplifier. The connections of amplifier devices such as electronic lamps, transistors, magnetic amplifiers, etc., together with the amplifier circuitry to determine the type of amplifier.

A voltage amplifier is an amplifier whose output voltage signal is greater than the input voltage signal. A power amplifier is an amplifier whose output signal power is greater than the input signal power.

Classification according to frequency response

In addition to classifying audio amplifiers by function, it is also possible to classify them by frequency response. The frequency response of an audio amplifier mainly refers to the frequency, the range of frequencies designed for amplification.

The parts of the response amplifier vary depending on the frequency. Amplifiers affect frequency response in different ways to change frequency. Capacitors and inductors in a circuit change the impedance and affect the frequency of the circuit.

There are three main types of frequency response for amplifiers: Audio Amplifiers, RF Amplifiers, and Video Amplifiers.

• Audio amplifiers are usually designed with frequencies between 15Hz and 20kHz. All amplifiers that fall within the audio frequency range are called audio amplifiers.
• RF amplifiers, also known as radio frequencies, are designed with frequencies between 10kHz and 100,000MHz. A single amplifier will not amplify the entire radio frequency range but any amplifier within the radio frequency range is an RF amplifier.
• Video amplifier is an amplifier designed with frequencies from 10Hz to 6MHz. This is a wide band in frequency, the gain band will amplify a very wide band of frequencies. However, the gain band will not work well in the narrow band.

The above article introduced you to what is audio amplification? Principle of operation and use with sound system . Hope to bring you useful information. If you have any questions, leave a comment below for support!