IPNG Internet Protocol, next generation IPP Integrated Performance Primitives [Intel] + Internet Printing Protocol IPR Intellectual Property Rights IPSE Integrated Project Support Environment IPSEC Internet Protocol Security IPTC International Press Telecommunications Council IPTV Internet Protocol Television IPX Internetwork Packet Exchange [Novell] IQL Interactive Query Language IR Infrared IRC Internet Relay Chat IRD Integrated Receiver/Descrambler IRDA (IrDA)Infrared Data Association IRDS Information Resource Dictionary System IRET Interrupt Return IRF Intermediate Routing Function + Inheritance Rights Filter [Novell] IRL Interactive Reader Language + Inter-Repeater Link IRLAP Infrared Link Access Protocol IRLED Infrared Light Emitting Diode IRM Information Resource Management + Inherent Rights Mask IRP I/O Request Packet IRQ Interrupt Request IRQL Interrupt Request Level
subband E of 2,450 to 3,000. Then the scrambler's switches and circuits may replace A by c, B by D, c by E, D by A, and E by B, thus jumbling the normal tones. The better band-splitters shift these substitutions every few seconds or milliseconds. The result sounds something like a recording of a Mah-Jongg game played too fast. Masking systems bury the voice signal in noise. The music from a phonograph record can be electrically superimposed on the voice, drowning it out. The descrambler, which must have an identical disk precisely synchronized with that of the scrambler, subtracts the phonograph signal out, leaving the voice. These systems resemble null ciphers, which interlard the true message within a welter of spurious symbols. Another system is wave-form modification. A fluctuating electrical current operates upon the voice current to produce rapid and extreme variations in the amplitude of the transmitted speech. This
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