The Range of Sound Amplifier Devices
An amplifier better known as an amp colloquially, increases the power of a signal. The term describes an electronic device that has an input signal in the form of voltage or current. Many types of electronic amplifiers are commonly used in radio and television transmitters. You get receivers for high-fidelity stereos, microcomputers and other electronic digital equipment including musical instruments. In audio applications they are used for loudspeakers in public address systems to enhance the human voice or to play pre-recorded music. The quality of amplifiers gets characterized by the range of its specifications. The job of this unique equipment remains simply to produce a more powerful version of the audio signal. Amplifiers are really quite intricate devices. They get classified by the input or source that they are designed to amplify or the device they are intended to drive. The frequency range of the signals such as Audio, IF, RF or VHF types is to invert the signal or the type of device used in the amplification process, be it a valve or tube or even FET. Sound as we well know is an interesting aspect that moves air particles around it that in turn move other air particles around them to carry the pulse of the vibrations through the air. It's our ears that pick up these fluctuations in air pressure and translate them into electrical signals which the brain processes. Amplifiers refer to components and equipment for amplifying the spectrum of audio from televisions, computers, portable CD players and other devices that use speakers to produce sound. The measure of how much noise is introduced in the amplification process is the test of an amplifier. Noise is a detrimental but unavoidable after effect in electronic devices and components. Metrics for noise factor involves a comparison between output signals to noise ratio and the thermal noise of input signals. It is the electrical signals that fluctuate to represent the compressions and rarefactions of the sound wave. The two important considerations in power amplification are power output and efficiency. In wireless communications and broadcasting transmitters the efficiency usually varies from fifty to seventy percent. In hi-fi audio power amplifiers, distortion thus becomes an important factor. This remains the measure of extent to which output waveform offers faithful replication of input waveform. The lower the distortion the better the fidelity of the output sound. Power amplifiers are great for wireless transmitters, broadcast transmitters, and hi-fi audio equipment. The most frequently-used device is of course the bipolar transistor. However, vacuum tubes that had become archaic are now popular once again especially with musicians. Professionals believe that vacuum tubes or valves as they are also known provide superior fidelity. Actually all the major components in amplifying systems are essentially translators. They receive signals in one form and put it out in another. Eventually the sound signal is translated back into its original form like a physical sound wave. Electronic sound equipment works much the same basic way to represent sound as a varying electric current.