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Spectrogram is one the tools used for audio and sound restoration.
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Fandango Recording

Audio and sound restoration

Fandango Recording Toronto provides audio and sound restoration and enhancement from many audio sources. The most common audio sources are reel to reel tapes, cassettes, vinyl - 33, 45 and 78', mini tapes, minidisc, VHS tapes, phone answering machines and tapes, and many more. The following are some mp3's samples of audio restoration. The first two samples are from "A Passing Fancy" album - transfer from vinyl, audio restoration and remastering performed for Pacemaker Toronto, the third sample is from Eugene Smith - restoration and remastering released by the same label - and the fourth sample -Sugar foot stomp - is from a very old and almost completely destroyed vinyl recorded in 1944 in Manitoba by Mr. Alan Parkin from Toronto and his band on 78 format.

"I'm losing tonight" original and restored:
"A Passing Fancy" original and restored:
Eugene Smith- "Amy" - original and restored:
Alan Parkin - "Sugar Foot Stomp"- original and restored:
The important question is to what extent can this process restore the freshness of a song? Are there any other advantages to this? There is no short answer. First of all, let's consider the example of an old tape: it's only going to get worse in time, and it's exhibiting a lot of noise and lack of details. Or take an old LP, a lot of crackles, scratches, clicks, thumps and noise. Having them restored and burnt on a CD or on a digital archive is definitely an advantage; the digital medium won’t degrade in time like an analog tape.

There is a difference between transfer and audio restoration;
transferring from analog to digital does just that, maintaining the sound problems from the original source. When it comes to sound restoration, we are listening to the source and decide the best way to convert it, having in mind the processes required for restoration.

What exactly does restoration involves?

The sound restoration process deals with noise, crackles, scratches, clipping, hiss, hum and clicks removal, spectral repair and advanced spectrogram restoration, and brings back some of the shine of the
recording. If needed, warmth or harmonic enhancement will be done. The removal of the unwanted problems is done using RX Advanced Audio Restoration (Izotope), Restoration Suite for TC Powercore, Algoritmix Noise/Scratch Free, Sonnox Restore, and Waves Restoration Bundle.

The next step is the harmonic enhancement of the material to get the best perception of the original sound. This is done through sophisticated
programs and hardware, and the result is quite spectacular. The harmonic enhancement is needed as the removal of noises, crackles, scratches, clicks, thumps does affect to a certain extent the audio part. EQ just doesn't do it in this case. Once the process is finished, the audio file is saved and prepared for delivery over internet or memory sticks, or for burning on CD.

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