MP3 AUDIO RECORDER HARDWARE SERIES

Fowler, this '.cylinder with raised pins on the surface remained the basic device to produce and reproduce music mechanically until the second half of the nineteenth century.' The Banū Mūsā brothers also invented an automatic flute player, which appears to have been the first programmable machine. Automatic music reproduction traces back as far as the 9th century, when the Banū Mūsā brothers invented the earliest known mechanical musical instrument, in this case, a hydropowered (water-powered) organ that played interchangeable cylinders. Long before sound was first recorded, music was recorded-first by written music notation, then also by mechanical devices (e.g., wind-up music boxes, in which a mechanism turns a spindle, which plucks metal tines, thus reproducing a melody). Prior to the development of sound recording, there were mechanical systems, such as wind-up music boxes and, later, player pianos, for encoding and reproducing instrumental music. A digital audio signal must be reconverted to analog form during playback before it is amplified and connected to a loudspeaker to produce sound.

MP3 AUDIO RECORDER HARDWARE SERIES

Digital recording stores audio as a series of binary numbers (zeros and ones) representing samples of the amplitude of the audio signal at equal time intervals, at a sample rate high enough to convey all sounds capable of being heard. This lets the audio data be stored and transmitted by a wider variety of media. Analog sound reproduction is the reverse process, with a bigger loudspeaker diaphragm causing changes to atmospheric pressure to form acoustic sound waves.ĭigital recording and reproduction converts the analog sound signal picked up by the microphone to a digital form by the process of sampling. In magnetic tape recording, the sound waves vibrate the microphone diaphragm and are converted into a varying electric current, which is then converted to a varying magnetic field by an electromagnet, which makes a representation of the sound as magnetized areas on a plastic tape with a magnetic coating on it. The process is reversed in sound reproduction, and the variations stored on the medium are transformed back into sound waves.Īcoustic analog recording is achieved by a microphone diaphragm that senses changes in atmospheric pressure caused by acoustic sound waves and records them as a mechanical representation of the sound waves on a medium such as a phonograph record (in which a stylus cuts grooves on a record).

Sound recording is the transcription of invisible vibrations in air onto a storage medium such as a phonograph disc. The two main classes of sound recording technology are analog recording and digital recording. Sound recording and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. Frances Densmore recording Blackfoot chief Mountain Chief on a cylinder phonograph for the Bureau of American Ethnology (1916)

Mp3 audio recorder hardware