OR-0025
Salo Oy
Salo, Finland · 1991 – c. 2004
Ser. ER-9611-0623
1996 · effect
Issued as VST3 · AU
Restored 2025 from 1996 hardware.
Salo 5110 — Frame Erasure / Dropped Call
Salo 5110 · frame-erasure test unit · restored from unit no. ER-9611-0623 · Salo Oy, Salo, Finland, 1996
The restorer's note
A call dies in stages — a robotic freeze, an underwater warble, then nothing — and this is the unit that let engineers hear each stage on demand. What sounds like failure is the concealment algorithm doing its careful best with frames that never arrived. Preserved intact, silence and all.
Acquisition
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The plate
Listening
Listening
Demonstration recordings, prepared at the bench.
A weak cell
The note reads plainly for six seconds; then the concealment begins — Erasure at its bench 15 %, each lost frame patched with a repeat of the last good one, fading at 3 dB a frame.
0:00 / 0:30
More and more missing
Erasure is walked from nought to sixty percent — the repeats and freezes thickening as the frames go — and at twenty-four seconds Burst rises to ten frames, so each loss holds longer.
0:00 / 0:30
Dropped by hand
Mode set to Manual: each dropout is forced with Trigger, first sparingly, then in a closing run — Burst raised to twelve frames, Attenuation at 6 dB a frame, Hold at six, so each long dropout fades and then goes to nothing.
0:00 / 0:30