89:. Clipping or loss of speech would occur for all conversations that needed to be assigned to an available idle channel and in practice lasted at least 17 ms whilst information required to re-connect both parties was signalled by the TASI control circuits. An additional freezeout period lasting between 0 and 500 ms would depend on the instantaneous loading of voice circuits. In actual use, these delays presented few problems in typical conversations.
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for a similar phenomenon in telecommunications. Another potential issue was ensuring that non-voice type circuits (e.g. Music or radio type circuits where pauses would occur infrequently) were not routed via TASI speech channels since these could seriously degrade the level of service where callers
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TASI takes advantage of the fact that in typical person-person conversation, speech in a single direction occurs for approximately 40% of the time, the remaining time being occupied with pauses and/or silence. Statistical analysis demonstrated that for an average voice channel usage of 40%, over 74
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One of the issues with using this type of technology was that the users listening on an idled channel can sometimes hear the conversation that has been switched onto it. Generally the sound heard was of very low volume and individual words are not distinguishable. See also
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has stopped speaking. When the original user resumes speaking, that user would, in turn, be switched to any channel that happened to be idle. The speech detector function is called
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speech circuits thereby doubling potential revenue for a small capital outlay relative to a highly expensive cable. e.g. £12.5 million (£263 million as of 2014) cost of the
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would encounter frequent clipped speech and breaks in the conversation.
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197: Multihop time assigned speech interpolation, 1991 (TASI)
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included TASI as a feature, not as distinct hardware.
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Technique to increase capacity of analog phone cables
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speech conversations could be handled using 37 full
46:. It was one of their first applications requiring
77:TASI worked by switching additional users onto any
42:in the early 1960s to increase the capacity of
35:links to increase voice transmission capacity.
31:) was an analog technique used on certain long
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128:"Overall Characteristics of a TASI system"
55:digital circuit multiplication equipment
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81:temporarily idled because an original
74:cable on which TASI was implemented.
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133:. September 19, 1961. Archived from
25:time-assignment speech interpolation
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206: This article incorporates
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219:General Services Administration
44:transatlantic telephone cables
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87:voice activity detection
214:Federal Standard 1037C
208:public domain material
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38:TASI was invented by
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114:References
174:8 October
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108:Talkspurt
95:crosstalk
61:Operation
40:Bell Labs
240:Category
102:See also
160:"TAT-1"
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68:Duplex
53:Later
210:from
138:(PDF)
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176:2014
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83:user
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