摘要: This report contains the results of a test and evaluation utilizing commercially available Reduced Rate Multiplexers performed by RADC's Digital Communication Experimental Facility (DICEF) in support of DCA/DCEC. Unlike previous w... 展开 This report contains the results of a test and evaluation utilizing commercially available Reduced Rate Multiplexers performed by RADC's Digital Communication Experimental Facility (DICEF) in support of DCA/DCEC. Unlike previous work in this area, the subject program considered the effect of an analog telecommunications channel prior to digitization by a Continuously Variable Slope Delta Modulation (CVSD) encoder. The major conclusion drawn from this evaluation is the fact that a system incorporating a 32 KB/S CVSD in tandem with a conventional analog telephone channel of relatively poor quality can support 2400 B/S modem transmission. 收起