Digital data transmission tests on voice channels
By: by Urban Sciences, Inc:, prepared by Law Enforcement Standards Laboratory, Center for Consumer Product Technology, National Bureau of Standards; prepared for National Institute of Law Enforcement and Criminal Justice, Law Enforcement Assistance Administration, U.S. Department of Justice.
Contributors: National Institute of Law Enforcement and Criminal Justice.
Series: Special publications -- 480/19.
Publisher: U.S. Government Printing Office
Published: 1977
Place of publication: Washington, D.C
Language: eng