A guide to voice scramblers for law enforcement agencies, Issues 480-488
Robert E. Nelson, United States. National Bureau of Standards, Law Enforcement Standards Laboratory, National Institute of Law Enforcement and Criminal Justice
Dept. of Commerce, National Bureau of Standards ; for sale by the Supt. of Docs., U. S. Govt. Print. Off., 1976 - Technology & Engineering - 34 pages
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12 dB SINAD acceptance testing addition of scramblers ambient audio noise audiofrequency response average voice power blers Bureau of Standards channel irregularities communica communications equipment communications system complex continually changing codes continuous transmission Criminal Justice cryptanalysis dB SINAD ratio decode defective scrambler degraded distortion eavesdropper Enforcement and Criminal Enforcement Standards Laboratory Fixed-code bandsplitters fixed-code inverters fixed-code scramblers frequency-hopping inverters function of SINAD guideline identified installation Institute of Law inversion frequency inverted speech key stream law enforcement agency Law Enforcement Standards LESL listeners masking ment National Bureau NILECJ standards noise power normal number of key opponent parameters percent performance requirements problems relatively request for proposal rolling-code bandsplitters satellite receivers satisfy scram scrambled messages scrambled signal Scrambler A lost scrambler manufacturers scrambler operation scrambler performance Scrambling by bandsplitting signal level sub-bands suppliers susceptibility synchronization of Scrambler telephone lines test scores test tone transmitter type of scrambler users voice quality voice scramblers