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Dynamic Noise Filter DNF1201A

Dynamic Noise Filter DNF1201A; KLH R&D Co.; (ID = 230710) Misc
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Dynamic Noise Filter DNF1201A; KLH R&D Co.; (ID = 230710) Misc
KLH R&D Co.;: Dynamic Noise Filter DNF1201A [Misc] ID = 230710 933x196
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For model Dynamic Noise Filter DNF1201A, KLH R&D Co.; Cambridge (MA)
Country:  United States of America (USA)
Manufacturer / Brand:  KLH R&D Co.; Cambridge (MA)
Year: 1978 ? Category: Miscellaneous (Other, Various) - see notes
Semiconductors (the count is only for transistors) 4:
Wave bands - without
Power type and voltage Alternating Current supply (AC) / (110) 220 Volt
Loudspeaker - For headphones or amp.
Power out
from Model: Dynamic Noise Filter DNF1201A - KLH R&D Co.; Cambridge MA
Material Metal case
Shape Rack
Dimensions (WHD) 485 x 90 x 200 mm / 19.1 x 3.5 x 7.9 inch
Notes 2-channel dynamic noise filter for audio signals. Bandwidth controller with sliding low-pass cut-off frequency from 27kHz down to 600Hz, depending of signal-amplitude and -frequency. Circuit uses 16 op-amp stages plus the transistors. Originally developed to compete the Dolby NR system. The predecessor of this model (with additional setup for '78') is the Burwen DNF1201. Entitled as 'KLH Burwen Research' the manufacturer is KLH, even though they wrote 'Burwen Research Inc., a subsidiary of KLH' on the back.
Source of data -- Collector info (Sammler)

Model page created by Georg Richter. See "Data change" for further contributors.

All listed radios etc. from KLH R&D Co.; Cambridge (MA)
Here you find 21 models, 18 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.