Audio electronics are used in the reproduction of sound by transforming electrical signals into air pressure waves that are as close as possible to the originally recorded sound. These sound production products include amplifiers and preamps, speakers and subwoofers, receivers, audio shelf systems, CD players and recorders, tape decks, mini disc players, home theater systems, headphones, microphones, DJ and Karaoke equipment. Amplifiers are used to boost electrical signals in many electronic devices, including radios, televisions, and telephones. A speaker is used as an acoustic output means in an audio-video system or multi-media system. Subwoofer speaker systems are designed to reproduce the lowest bass frequencies in music and sound. Microphone converts acoustic sound waves into an electrical representation of the sound wave. Microphones are used in many applications such as telephones, tape recorders, hearing aids, motion picture production and in radio and television broadcasting. Headphones (earphones, earbuds, stereophones, and headsets) are a pair of transducers that receive an electrical signal from a media player or receiver and use speakers placed in close proximity to the ears to convert the signal into audible sound waves. A compact disc player (CD) player plays audio CDs by using optical systems with a high precision laser to read the data.
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Sunday, 14 January 2007 |
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The advent of stereo surround sound systems has brought a more realistic and enveloping audio experience to listeners. A typical surround sound signal includes at least left front, center front, right front, left rear and right rear signals. Surround sound audio is growing rapidly due to the proliferation of home theaters, digital television, surround sound music, and multimedia computers. A multichannel surround system employed in a home theater system allows reproduction of surround sounds full of presence together with a video image reflected on a video screen. A home theater system may includes a large screen or projection TV, A/V components and a speaker system. The ability to process audio information has become increasingly important in the personal computer (PC) environment. |
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Sunday, 07 January 2007 |
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Due to the development of multimedia using a personal computer and digital communication technology, there is a rapidly increasing demand for headphones or headsets. Portable audio electronics such as CD players, MP3 players, and cell phones generaly employ headphones or earphones to reproduce an audio signal with the headphone worn by the listener on the head such that the headphone covers listener's ears. Headphones or earphones can provide excellent high fidelity audio and are reasonably comfortable. The earphone provides better sound transmission, which allows the user to hear the sound more clearly than if the sound were mediated by the air. Wireless headphones generally receive a radio frequency transmission form the selected audio programming of the user. |
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Wednesday, 20 December 2006 |
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In a conventional method of recording, reproducing, and editing audio signals, analog audio signals are magnetically recorded on a magnetic tape, and the recorded audio signals are reproduced and edited. With the progress of digital technique, processing of a large capacity of data is enabled and digital recording is adopted for recording various signals. Digital audio recorders have been developed in which the audio information is stored as digital data in a solid state memory. A digital audio recorder uses a memory card as a record medium and employs a data compressing method which allows data to be restored in a high quality for recording/reproducing. An audio signal compressed with a variety of compression formats, represented by MP3, is also often replayed with computers. |
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Thursday, 14 December 2006 |
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An audio equalizer within the audio system is used to adjust the sound energy of the audio data. An equalizer may generate equalized audio data that may then be converted into analog data so that sound may be generated by a sound generating device, such as a speaker or headphone. Audio frequency equalizers have been known for many years. Two well known types of audio equalizers include graphic equalizers and parametric equalizers. A graphic equalizer is made up of a set of equalizing filters with fixed center frequencies and bandwidths. Many equalizers achieve equalization by combining the output of a filter with the filter's input to amplify or attenuate signals in a frequency-selective way. A graphic equalizer divides the frequency band of audio signals into many frequency subbands. |
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Friday, 08 December 2006 |
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An audio mixer is used for combining multiple voice and music sources. An audio mixing console presents arrays of input devices, such as switches, knobs, and faders, for an operator to set to condition and route audio signals. Mixing techniques in audio systems involve the summation of two or more source audio signals to produce a combined audio signal output. In a typical mixing production, several inputs are coupled to the mixing console with a separate audio channel provided for each input. Surround-sound mixing consoles currently available on the market generally contain a bus matrix that is expanded to several output channels. Studios used by artists, producers or engineers use mixing consoles to produce music for live performances, compact discs, television or films. |
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Saturday, 02 December 2006 |
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Karaoke is a form of entertainment that features a live singer with pre-recorded accompaniment. A karaoke machine provides a microphone for the karaoke singer and displays lyrics or words of the selected song on a monitor. Karaoke machines display a background video matching a karaoke song being performed in order to augment the mood of the song. The typical karaoke machine is a stand-alone which presents a display of lyric characters and dynamic background pictures in addition to the karaoke accompaniment. The communication karaoke system is a multimedia network system handling audio information, character image information or moving picture image. Musical software for a communication karaoke system is produced by a MIDI instrument by a personal computer. |
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Thursday, 16 November 2006 |
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A car audio system is used to produce an audio reproduction for drivers and passengers. Audio components such as an AM/FM radio, cassette player, or compact disc player are increasingly popular options on motor vehicles. Car stereos are the audio systems set in the dashboards of an automobile. Audio devices installed in a car or the like must be compact and thin due to the space limitations. A tone control unit of vehicle audio system for controlling the tone quality of the input audio signal performs equalizer control and high/low tone control. An amplifier amplifies the input audio signal. The car speaker receives the amplifier signal and produces vibrations which produce sound. Car audio systems are generally designed that the power voltage of the system is directly supplied from a car storage battery. |
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Saturday, 11 November 2006 |
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Audio amplifiers are used to control the sound amplification, equalization, filtering, special effects, and other signal processing of the audio signal. Audio reproduction systems take signals representing audio information and convert them to sound waves. An audio speaker is a device that receives a signal and produces sound. The signal received by a speaker typically is an electric signal produced by an audio amplifier. An audio signal amplifier for amplifying an audio signal is mainly classified, in view of its operating state during its power amplifying stage, into three kinds of amplifiers including an A class amplifier, a B class amplifier and an AB class amplifier. A class D amplifier is known in which a digitized audio signal is directly converted to a pulse width modulated signal and is guided to a power switch. |
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Thursday, 26 October 2006 |
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Speaker systems are used in various apparatuses for the purpose of listening to music or diverse sound information. Audio systems are designed to deliver good quality sound throughout as wide an area as possible without degrading directionality of the sound. Speaker systems are often provided with speaker components specifically adapted for operating at different frequency ranges, including low range, mid range and high range. Speakers of different ranges may be used and installed in a cabinet to increase the sound of different frequencies. Subwoofers are typically used with stereo amplifiers or home entertainment systems to give an enhanced, realistic listening experience. Home entertainment systems have multichannel surround sound systems with three or more channels to provide theater sound effects. |
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Thursday, 19 October 2006 |
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Most vehicles include audio systems having a plurality of speakers distributed throughout the interior of the vehicle to provide a full-range, stereophonic sound system. Various arrangements of car speakers are available on the market. Such speaker systems reproduce stereo sound by means of a plurality of speakers to create a stereo acoustic image. Speakers are typically placed in the instrument panel, door panels, the rear storage ledge and sometimes in consoles. In automotive vehicles, environmental factors such as road, wind and engine noise effect substantially the desired sound effects. Cars usually include factory installed speakers that are often replaced with speakers yielding higher quality sound. Some automotive audio systems have echo systems to provide a better quality of sound. |
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Monday, 09 October 2006 |
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Headsets are commonly used with audio systems to provide the user with a convenient and private way to hear the audio output. The development of wireless communication technology enables realization of low-cost, low-power wireless devices or wireless links. Wireless headsets have become increasingly popular in recent years. Bluetooth enables electronic devices to communicate via short-range radio connections. Bluetooth is a radio frequency (RF) specification for short-range, point-to-multipoint voice and data transfer. Bluetooth is based on a low-cost, short-range radio link, and facilitates ad hoc connections for stationary and mobile communication environments. Bluetooth headsets provide users with additional functions along with a basic voice communication function. |
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Friday, 22 September 2006 |
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Hearing aids are electronic instruments worn in or around the ear that compensate for hearing losses by amplifying sound. A hearing aid includes a microphone which receives an acoustic input signal and converts it into an electrical signal, a filter which processes the signal, an amplifier which produces an amplified output signal, and a speaker which delivers the output signal. Hearing aids are normally divided into three categories: behind the ear (BTE) aids, in the ear (ITE) aids, in the canal (ITC) aids, or completely in the canal (CIC) aids. Hearing aids are usually able to respond to the different auditory situations because the hearing aid user can switch them into different hearing programs. Hearing aids typically contain a battery that powers electrical circuits that amplify sound. |
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Thursday, 14 September 2006 |
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Speakers are typical peripheral devices for a personal computer. With the growing popularity of sound-based multimedia systems, an increasing number of computers and computer peripheral devices are being provided with speakers to accommodate the multimedia systems' sound requirements. Multimedia computer speaker systems typically include pairs of wide-band speakers mounted in separate housings with amplification electronics incorporated into one or both housings. Typical speakers can be positioned near or are incorporated into the computer monitor to deliver higher quality sound directly to the user. Some multimedia computers include four-channel audio subsystems, sometimes called surround sound systems, environmental audio systems, or multi-channel audio systems. |
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Sunday, 03 September 2006 |
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Receivers are capable of receiving and processing an audio signal and/or visual input signal. A number of existing audio systems are designed to play back the signals from the auxiliary audio source using receivers. Stereo receivers are generally adapted to receive a radio frequency signal, derive from it a stereo composite signal and decode the stereo composite signal into left and right channel audio frequency signals. A receiver may have both analog and digital receiving circuits, and be capable of receiving both types of broadcasts. Digital audio broadcasting has many advantages over analog broadcasting, especially for mobile receivers. Communications of digital audio signals between home appliances such as digital audio systems are performed in accordance with a protocol of DAI format. |
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Monday, 28 August 2006 |
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Wireless local transmission of audio data has become very popular in recent years. Wireless transmission eliminates the need for wires which are annoying and limiting. Local wireless transmission is used in portable home telephone systems, stereo systems, home theater systems, and sound surround systems. Wireless speakers allow the listener to move from room to room without the distraction or nuisance of a cord. Wireless audio systems generally include an audio source such as a tuner transmitting a signal to one or more wireless speakers or headphones. Wireless headphones or speakers receive musical signals transmitted directly from home stereo systems or portable music players. These headphones or speakers receive signals over prescribed electromagnetic bands. |
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Wednesday, 16 August 2006 |
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Sound is a propagating change or series of changes in the local pressure of a medium. Microphone is a device that transforms these pressure changes into electrical signals. The microphone is typically a piezoelectric or ribbon magnetic device that responds to the audible communications from the user, and converts the audible communications into an audio signal that is an electrical representation of the audible communications. Microphones are used everywhere in A/V applications. Microphones for voice input have become a necessary device. Capacitor/condenser and dynamic microphones are the two main types in the microphone family. The electric output of a condenser microphone is obtained on the basis of the relative displacement of an oscillator and a stator. |
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Audio Electronics
