Noise reduction and audio restoration

 

Background noise is contamination or interference in the audio that is not part of the desired sound. Mess up the audio. Audio restoration, also known as digitization, is the process of converting an audio to a digital format. To remove that part of the audio that bothers us we are using, there are different programs and different techniques. It is important to say that an edited audio will never look the same that one that is recorded correctly.  It also allows to recover analog recordings.

Currently there are a thousand editing programs that allow editing audio to be cleaner and reduce noise. I’m going to talk about that later. let’s take a brief tour of the audio recorders of the story.

Background

Phonograph

This phonoautogram of 1860 by Leon Scott, is the first reproducible and recognizable recording of the human voice known to the present. This could transcribe sound to a visible medium, but had no way of being reproduced later.

 

Phonograph and Gramophone.

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The American inventor Thomas Alva Edison announced the invention of his first phonograph on November 21, 1877, and showed his device for the first time eight days later and patented it on February 19, 1878, shortly patented the megaphone. At the beginning cardboard cylinders coated with tin foil were used, later it was tested with waxed cardboard, so that in 1890 the cylinder of solid wax finally appeared, which ended up being the consolidated medium of the invention. The cylinder of wax, was of greater quality and durability, hence its commercial success.The phonograph uses an analogical mechanical recording system, in which the sound waves, which can be produced by the voice or other means, are transformed into vibrations and these into a vertically traced groove, which will later be passed on to the user. needle and it will collect the vibrations in the phonograph cylinder.

 

Laserdisc

 

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The Laserdisc appears two months later the first VHS tapes appeared on the market and five years later the CD appeared based on Laserdisc technology. Although it emerged in 1978, the invention was patented in 1961, and by 1969 Philips had developed a reflective video disc that had great advantages over the transparent one.

 

Digital audio tape

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In the mid-1980s Sony developed the first digital cassette system, known as DAT (Digital Audio Tape). This digital cassette uses 4mm magnetic tape, encapsulated in a protective casing, but is approximately half the size with 73mm long by 54mm wide by 10.5mm thick cassette. As the name implies, the recording is done digitally instead of analogically.Like many cassette video formats, a DAT cassette can only be recorded on one side, unlike a compact analog audio cassette.

 

CD compact disc

images.jpgThe first approximations to what today is known as compact disc were made in the late 1970s. During this time appeared various systems of mechanical and capacitive reading videodisc, but of these prototypes the only one that has persisted until today has been the optical videoscope, now better known as Laser Vision. The first prototypes of Laser Vision turntables (nothing to do with vinyl record players) appeared in laboratories around the 1970s and in the following years several companies like Philips, Disco Vision and Pioneer, invested to develop a viable product that It was presented in 1978. MP3 The mp3 format became the standard used for the compression of high quality audio (with loss in high fidelity equipment), thanks to the possibility of adjusting the quality of the compression, proportional to the size per second and therefore the final size of the file, which could occupy 12 and even 15 times less than the original uncompressed file. It was the first audio compression format popularized thanks to the Internet since it made possible the exchange of musical files. The legal proceedings against companies such as Napster and AudioGalaxy are the result of the ease with which these types of files are shared. 

Blu-ray Disc

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The four-layer Blu-ray disc has a capacity of 100 Gigabyte, the largest achievement in a recording medium.The Blu-ray disc began to develop from May 19, 2005 when TDK announced a prototype of four-layer 100-gigabyte blu-ray disc. While Hitachi announced on October 3, 2007 that it had developed a 100 GB BD-ROM prototype that unlike the TDK and Panasonic version, it was compatible with commercially available readers and only required a firmware update. Hitachi also commented that he is developing a 200 GB version. But Pioneer’s recent breakthrough allowed it to create a 20-layer blu-ray disc with a total capacity of 500 GB, although it would not be compatible with the reader units already available on the market, as Hitachi would do.60 These discs were used for video game console Playstation 3. The blu-ray discs incorporate five anticopy systems: AACS, BD + and Rom Mark, SPDG and ICT.

As far as audio restoration is concerned, currently most of the editing programs and softwares have the option to edit audio and restore it and also, reduce the background noise.  We’re going to see audio restoration in audition.

You can solve a lot of audio problems by combining two effective functions. First, use the Spectral Display to visually identify and select ranges of noise and other unwanted individual effects. (See Selecting spectral ranges and Selecting and automatically repairing unwanted effects.)

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Next, use the Diagnostic or Noise Reduction effects to solve problems such as the following: Cracks from wireless microphones or old vinyl records. (See Automatic click deleting effect.) Background noise like the murmur of the wind, a whistle of tape or a buzz of power line. (See Adaptive Noise Reduction Effect and DeHummer Effect.) Phase cancellation from misplaced stereo microphones or misaligned tape machines. (See Automatic Phase Correction Effect.)

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Learn how to reduce noise: Noise reduction / Restauration

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