Sound recording and reproduction is an electrical Electricity is a general term that encompasses a variety of phenomena resulting from the presence and flow of electric charge. These include many easily recognizable phenomena, such as lightning and static electricity, but in addition, less familiar concepts, such as the electromagnetic field and electromagnetic induction or mechanical Mechanics is the branch of physics concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effect of the bodies on their environment. The discipline has its roots in several ancient civilizations (see History of classical mechanics and Timeline of classical mechanics). During the early modern inscription and re-creation of sound Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations waves, such as spoken voice The human voice consists of sound made by a human being using the vocal folds for talking, singing, laughing, crying, screaming, etc. Human voice is specifically that part of human sound production in which the vocal folds are the primary sound source. Generally speaking, the mechanism for generating the human voice can be subdivided into three, singing, instrumental music An instrumental is a musical composition or recording without lyrics or any other sort of vocal music; all of the music is produced by musical instruments. This term is used when referring to popular music rather than to other musical genres such as European classical music. In commercial music, instrumental tracks are sometimes renditions of a, or sound effects. The two main classes of sound recording technology are analog recording Analog recording (Greek, ana is "according to" and logos "relationship") is a technique used to store signals of audio or video information for later playback and digital recording In digital recording, the analog signal of video or sound is converted into a stream of discrete numbers, representing the changes in chroma and luminance values or air pressure (audio) through time, thus making an abstract template for the original sound or moving image. Acoustic analog recording is achieved by a small microphone A microphone, colloquially called a mic or mike , is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. In 1876, Emile Berliner invented the first microphone used as a telephone voice transmitter. Microphones are used in many applications such as telephones, tape recorders, hearing aids, motion picture diaphragm that can detect changes in atmospheric pressure (acoustic Acoustics is the interdisciplinary science that deals with the study of sound, ultrasound and infrasound . A scientist who works in the field of acoustics is an acoustician. The application of acoustics in technology is called acoustical engineering. There is often much overlap and interaction between the interests of acousticians and acoustical sound waves) and record them as a graphic representation of the sound waves on a medium such as a phonograph The record player, phonograph or gramophone was the most common device for playing recorded sound from the late 1870s until the late 1980s (in which a stylus senses grooves on a record). In magnetic tape Magnetic tape is a medium for magnetic recording generally consisting of a thin magnetizable coating on a long and narrow strip of plastic. Nearly all recording tape is of this type, whether used for recording audio or video or for computer data storage. It was originally developed in Germany, based on the concept of magnetic wire recording recording, the sound waves vibrate the microphone diaphragm and are converted into a varying electric current Electric current can mean, depending on the context, a flow of electric charge or the rate of flow of electric charge (a quantity). This flowing electric charge is typically carried by moving electrons, in a conductor such as wire; in an electrolyte, it is instead carried by ions, and, in a plasma, by both, which is then converted to a varying magnetic field Magnetic fields surround magnetic materials and electric currents and are detected by the force they exert on other magnetic materials and moving electric charges. The magnetic field at any given point is specified by both a direction and a magnitude ; as such it is a vector field by an electromagnet An electromagnet is a type of magnet whose magnetic field is produced by the flow of electric current. The magnetic field disappears when the current ceases, which makes a representation of the sound as magnetized areas on a plastic tape with a magnetic coating on it. Analog sound reproduction is the reverse process, with a bigger loudspeaker A loudspeaker is an electroacoustic transducer that converts an electrical signal into sound. The speaker pulses in accordance with the variations of an electrical signal and causes sound waves to propagate through a medium such as air or water diaphragm causing changes to atmospheric pressure to form acoustic sound waves. Electronically generated sound waves may also be recorded directly from devices such as an electric guitar pickup A pickup device acts as a transducer that captures mechanical vibrations and converts them to an electrical signal, which can be amplified and recorded or a synthesizer A synthesizer is an electronic instrument that is capable of producing a variety of sounds by generating and combining signals of different frequencies. Synthesizers create electrical signals, rather than direct acoustic sounds, which are then played through a loudspeaker or set of headphones, without the use of acoustics in the recording process other than the need for musicians to hear how well they are playing during recording sessions.
Digital recording and reproduction converts the analog sound signal picked up by the microphone to a digital form by a process of digitization Digitizing or digitization is the representation of an object, image, sound, document or a signal by a discrete set of its points or samples. The result is called digital representation or, more specifically, a digital image, for the object, and digital form, for the signal. Strictly speaking, digitizing means simply capturing an analog signal in, allowing it to be stored and transmitted Data transmission, digital transmission or digital communications is the physical transfer of data over a point-to-point or point-to-multipoint transmission medium. Examples of such media are copper wires, optical fibers, wireless communication media, and storage media. The data is often represented as an electro-magnetic signal, such as an by a wider variety of media. Digital recording stores audio as a series of binary The binary numeral system, or base-2 number system represents numeric values using two symbols, 0 and 1. More specifically, the usual base-2 system is a positional notation with a radix of 2. Owing to its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used internally by all modern computers numbers representing samples of the amplitude Amplitude is the magnitude of change in the oscillating variable, with each oscillation, within an oscillating system. For instance, sound waves are oscillations in atmospheric pressure and their amplitudes are proportional to the change in pressure during one oscillation. If the variable undergoes regular oscillations, and a graph of the system of the audio signal An audio signal is a representation of sound waves in a different form. Typically this is an electrical voltage, but these signals can be expressed through alternative mediums such as magnetic particles, when recorded onto analogue tape; or as RF waves, when broadcast through radio; or even as pulses of light, when transmitting through fiber optic at equal time intervals, at a sample rate The sampling rate, sample rate, or sampling frequency defines the number of samples per second taken from a continuous signal to make a discrete signal. For time-domain signals, it can be measured in samples per second (S/s), or hertz (Hz). The inverse of the sampling frequency is the sampling period or sampling interval, which is the time between so fast that the human ear perceives the result as continuous sound. Digital recordings are considered higher quality than analog recordings not necessarily because they have higher fidelity High fidelity or hi-fi reproduction is a term used by home stereo listeners and home audio enthusiasts to refer to high-quality reproduction of sound or images that are very faithful to the original performance. Ideally, high-fidelity equipment has minimal amounts of noise and distortion and an accurate frequency response as set out in 1973 by the (wider frequency response Frequency response is the measure of any system's output spectrum in response to an input signal. In the audible range it is usually referred to in connection with electronic amplifiers, microphones and loudspeakers. Radio spectrum frequency response can refer to measurements of coaxial cables, category cables, video switchers and wireless or dynamic range Dynamic range is a term used frequently in numerous fields to describe the ratio between the smallest and largest possible values of a changeable quantity, such as in sound and light. It is measured as a ratio, or as a base-10 or base-2 (doublings, bits or stops) logarithmic value), but because the digital format can prevent much loss of quality found in analog recording due to noise and electromagnetic interference Electromagnetic interference is a disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. The source may be any object, artificial or natural, in playback, and mechanical deterioration or damage to the storage medium A data storage device is a device for recording information (data). Recording can be done using virtually any form of energy, spanning from manual muscle power in handwriting, to acoustic vibrations in phonographic recording, to electromagnetic energy modulating magnetic tape and optical discs. A digital audio Digital audio uses digital signals for sound reproduction. This includes analog-to-digital conversion, digital-to-analog conversion, storage, and transmission. In effect, the system commonly referred to as digital is in fact a discrete-time, discrete-level analog of a previous electrical analog. While modern systems can be quite subtle in their signal must be reconverted to analog form during playback before it is applied to a loudspeaker or earphones.
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hu, 09 Jul 2009 11:03:10 GM
In order to choose a decent studio I was hoping someone could give me a few quick recommendations on what are the 'essential/best' mikes that a studio should own for . recording. drums and vox, since I'm going to be basing my choice of ...
Q. Everytime I set it up to record a show it only records sound but there is never any video. Only a blue screen is shown and the sound.
Asked by JKuL - Tue Jun 2 21:14:17 2009 - - 1 Answers - 0 Comments
A. A Blue screen generally indicates that you are not sending any video to the VCR. Best you check your video input connections to your Line 1 or Line 2 of the VCR unit. If you are getting sound, then your Red/White connections must be OK. If your input is through the RF connector, then check your Remote control for the corrrect Video input selection. This applies to both A/V and RF connections.
Answered by gilloz - Tue Jun 2 21:27:04 2009
