OR-0013
Tekura
Oregon, USA · 1979 – c. 2001
Ser. Type 2200 · Ser. No. 01138-B
1990 · effect
Issued as VST3 · AU
Restored 2024 from 1990 hardware.
Tekura 2200 — Signal Decimator
Tekura Type 2200 · Signal Decimator · restored from Ser. No. 01138-B · Tekura, Oregon, USA, 1990
The restorer's note
Where most sample-rate reducers hide the aliasing, Tekura's instrument makes it a measured choice — clean band-limited decimation, or the folded-over kind, on a switch. An engineer's honesty, put to destructive use. Restored from a revision-B bench unit.
Acquisition
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The plate
The controls
The controls.
- Rate 100 Hz–48.0 kHz · 11.0 kHz as issued
- Sets the sample rate the signal is decimated to before being reconstructed; lower settings decimate harder.
- Mode Sample-and-Hold as issued
- Chooses how the signal is decimated: Band-limited, which filters first to avoid aliasing, or Sample-and-Hold, which holds each sample and lets the result fold over.
- Anti-alias Off as issued
- Switches a filter in ahead of decimation: On removes frequencies that would alias; Off lets the full foldover through.
- Output Filter 1.0–20.0 kHz · 20.0 kHz as issued
- Sets a low-pass filter after decimation to tame the harshness of the aliased or held signal; at its top, 20 kHz, the filter has no effect.
- Input -24.00–24.00 dB · 0.00 dB as issued
- Sets the level going in, in decibels, before the signal reaches the restored circuit.
- Output -24.00–24.00 dB · 0.00 dB as issued
- Sets the level coming out, in decibels, after the restored circuit and the Mix blend.
- Mix 0–100 % · 100 % as issued
- Blends the restored circuit against the untouched signal at equal power, from the untouched signal alone at 0 % to the circuit alone at 100 %.
- Bypass Off as issued
- Takes the restored circuit out of the path and passes the untouched signal, delayed to match the circuit so nothing shifts in time.
A stored setting is numbered, never named: the trace's overlay reads SETTING 04/09. The thumbwheel's position is the setting, and it applies as it clicks into place; ▲ ▼ step one at a time and stop at the ends. STORE asks STORE NN?, and a second press keeps the present state as SETTING NN. Holding STORE on a user setting asks CLEAR NN?, and a second press clears it.
Listening
Listening
Demonstration recordings, prepared at the bench.
Eleven kilohertz, plainly
The phrase runs dry for five seconds, then the bench default: sample-and-hold to 11.025 kHz, anti-alias off. The top octave folds back into the material.
0:00 / 0:30
The rate walked down
Rate is walked from 26 kHz down to 1 kHz in one pass — sample-and-hold, no anti-alias filter. The foldover arrives on schedule; nothing here is misbehaving.
0:00 / 0:30
Two ways down
The same figure taken down two ways: Band-limited at 4 kHz with the anti-alias filter in, then Sample-and-Hold with it out. The Output Filter closes to 3.5 kHz at the end.
0:00 / 0:30