| 摘要 |
FIELD: electrical communications confidential telephone communications systems operating at high channel noise levels and acoustic noise. SUBSTANCE: apparatus has speech converter 1, data converting and switching unit 2, line unit 3, receive control 4, transmit control 5, code shaper 6, monitoring and interlocking device 7, random pulse generator 8, sync pulse analyzing and checking device 9, clock synchronizer 10, power supply 11. In addition, it is provided with amplifying and filtering device 12 incorporating adjustable amplifier 13, tunable low-frequency filter 14, and digital-to-analog converter 15. EFFECT: provision for adaptive variation of speech converter passband and output signal level depending on intensity of channel error; improved intelligibility of transmitted speech. ЫЫЫ1v |
