Sound Amplification System
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AMERICAN INDIA FOUNDATION DIGITAL EQUALIZER PROGRAM
DE center: Govt. Sec. School Bahadurgarh Patiala CONTEST-2006 STUDENTS PROFILE TEACHERS PROFILE
What is sound amplification system? To explain this question, let us learn about different terms used in sound amplification system i.e. Sound, Amplification, and System. Sound: Sound waves exist as variations of pressure in a medium such as air. They are created by the vibration of an object, which causes the air surrounding it to vibrate. The vibrating air then causes the human eardrum to vibrate, which the brain interprets as sound. Sound waves travel through air in much the same way as water waves travel through water. Variations in Air Pressure and Corresponding Waveform
Amplification: To increase the power of signal and the device which used to increase the power of signal is called amplifier. Electronic Amplifier
System: System, any collection of component elements that work together to perform a task So, Sound Amplification System is works with audio frequencies (generally 20 hertz to 20,000 hertz (the range of frequencies detectable by the human ear). It is the final stage in
1
the audio playback chain and its purpose is to amplify the electrical audio signal from its preceding stage to a level that can drive the loudspeaker(s).
How sound amplification system works? Working with audio means working with sound systems. Naturally, the range of systems available for different applications is enormous. However, all electronic audio systems are based around one very simple concept: To take sound waves, convert them into an electric current and manipulate them as desired, then convert them back into sound waves. A very simple sound system is shown in the diagram below. It is made up of two types of component: •
•
Transducer - A device which converts energy from one form into another. The two types of transducers we will deal with are microphones (which convert acoustical energy into electrical energy) and speakers (which convert electrical energy into acoustical energy). Amplifier - A device which takes a signal and increases its power (i.e. it increases the amplitude).
1. The process begins with a sound source (such as a human voice), which creates waves of sound (acoustical energy). 2. These waves are detected by a transducer (microphone), which converts them to electrical energy. 3. The electrical signal from the microphone is very weak, and must be fed to an amplifier before anything serious can be done with it. 4. The loudspeaker converts the electrical signal back into sound waves, which are heard by human ears. 5. In Amplifier there are mainly three circuits: 1. Input circuit: current/voltage represents sound 2. Output circuit: amplified “sound” current/voltage 3. Power circuit: provides power for amplification Amplifier main components are Resistors – provide voltage drops, limit current Capacitors – store charge, shift voltages, Diodes – one-way devices for current Transistors – control current flow.
2
References:
Microsoft Encarta, Class 9th Science book. Internet: www.howstuffworks.com
3
DE center: Govt. Sec. School Bahadurgarh Patiala CONTEST-2006 STUDENTS PROFILE TEACHERS PROFILE
What is sound amplification system? To explain this question, let us learn about different terms used in sound amplification system i.e. Sound, Amplification, and System. Sound: Sound waves exist as variations of pressure in a medium such as air. They are created by the vibration of an object, which causes the air surrounding it to vibrate. The vibrating air then causes the human eardrum to vibrate, which the brain interprets as sound. Sound waves travel through air in much the same way as water waves travel through water. Variations in Air Pressure and Corresponding Waveform
Amplification: To increase the power of signal and the device which used to increase the power of signal is called amplifier. Electronic Amplifier
System: System, any collection of component elements that work together to perform a task So, Sound Amplification System is works with audio frequencies (generally 20 hertz to 20,000 hertz (the range of frequencies detectable by the human ear). It is the final stage in
1
the audio playback chain and its purpose is to amplify the electrical audio signal from its preceding stage to a level that can drive the loudspeaker(s).
How sound amplification system works? Working with audio means working with sound systems. Naturally, the range of systems available for different applications is enormous. However, all electronic audio systems are based around one very simple concept: To take sound waves, convert them into an electric current and manipulate them as desired, then convert them back into sound waves. A very simple sound system is shown in the diagram below. It is made up of two types of component: •
•
Transducer - A device which converts energy from one form into another. The two types of transducers we will deal with are microphones (which convert acoustical energy into electrical energy) and speakers (which convert electrical energy into acoustical energy). Amplifier - A device which takes a signal and increases its power (i.e. it increases the amplitude).
1. The process begins with a sound source (such as a human voice), which creates waves of sound (acoustical energy). 2. These waves are detected by a transducer (microphone), which converts them to electrical energy. 3. The electrical signal from the microphone is very weak, and must be fed to an amplifier before anything serious can be done with it. 4. The loudspeaker converts the electrical signal back into sound waves, which are heard by human ears. 5. In Amplifier there are mainly three circuits: 1. Input circuit: current/voltage represents sound 2. Output circuit: amplified “sound” current/voltage 3. Power circuit: provides power for amplification Amplifier main components are Resistors – provide voltage drops, limit current Capacitors – store charge, shift voltages, Diodes – one-way devices for current Transistors – control current flow.
2
References:
Microsoft Encarta, Class 9th Science book. Internet: www.howstuffworks.com
3
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