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In telecommunication, a time-assignment speech interpolation (TASI) was an analog technique used on certain long transmission links to increase voice-transmission capacity. 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 speech conversations could be handled using 37 full Duplex 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 TAT-1 cable on which TASI was implemented.

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  • Time-assignment speech interpolation
  • Zeitzugeordnete Sprachinterpolation
  • Sistema TASI
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  • In telecommunication, a time-assignment speech interpolation (TASI) was an analog technique used on certain long transmission links to increase voice-transmission capacity. 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 speech conversations could be handled using 37 full Duplex 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 TAT-1 cable on which TASI was implemented.
  • Bei der zeitzugeordneten Sprachinterpolation (ZSI, englisch time-assignment speech interpolation, TASI) handelt es sich um ein von Bell Labs entwickeltes dynamisches Multiplexverfahren für analoge Tonsignale, bei dem den Teilnehmern nur dann einer der Kanäle eines Übertragungsmediums zugeordnet wird, wenn tatsächlich gesprochen wird.
  • Un sistema TASI (Time Assignment Speech Interpolation) es un sistema de concentración de circuitos con tiempo compartido, basado en el principio de interpolación de la palabra. Cuando un abonado comienza a hablar se le conecta a uno de los canales libres. Si hay unos pocos abonados más que canales, ninguno de los abonados necesitará ser interpolado después de que su conexión inicial se establezca, en base al concepto de probabilidad de tráfico.
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  • In telecommunication, a time-assignment speech interpolation (TASI) was an analog technique used on certain long transmission links to increase voice-transmission capacity. 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 speech conversations could be handled using 37 full Duplex 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 TAT-1 cable on which TASI was implemented. TASI worked by switching additional users onto any channel temporarily idled because an original user 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 voice activity detection. 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. 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 crosstalk 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 would encounter frequent clipped speech and breaks in the conversation. TASI was invented by Bell Labs in the early 1960s to increase the capacity of transatlantic telephone cables. It was one of their first applications requiring electronic switching of voice circuits. Later Digital Circuit Multiplication Equipment included TASI as a feature, not as distinct hardware.
  • Bei der zeitzugeordneten Sprachinterpolation (ZSI, englisch time-assignment speech interpolation, TASI) handelt es sich um ein von Bell Labs entwickeltes dynamisches Multiplexverfahren für analoge Tonsignale, bei dem den Teilnehmern nur dann einer der Kanäle eines Übertragungsmediums zugeordnet wird, wenn tatsächlich gesprochen wird. Hierbei wird den Teilnehmern ein Kanal nur solange zugeteilt, wie Tonsignale registriert werden. Tritt eine Sprechpause ein, wird der Kanal sofort freigegeben, um von einem anderen Teilnehmerverbindung genutzt werden zu können. Wird das Sprechen wieder fortgesetzt, wird ein anderer, gerade freier Kanal zugeteilt. Auch der neue Kanal wird dann bei Stille wieder freigegeben. Jeder Nutzkanal des Übertragungsmediums kann auf diese Weise von mehreren Teilnehmerverbindungen quasi gleichzeitig genutzt werden. Dieses Verfahren erfordert einen zentralen Managementkanal für die Zeichengabe. In diesem Managementkanal teilt der Sender dem Empfänger ständig die momentane Kanalbelegung des Übertragungsmediums mit. Mit diesen Informationen kann der Empfänger dann die einzelnen Zeitabschnitte einer Teilnehmerverbindung, die auf mehrere Kanäle aufgeteilt und übertragen wurden, wieder zu einem kontinuierlichen Signal zusammensetzen. Bei diesem Verfahren treten durch die Umschaltungen Verluste an Sprachinformation auf. Wenn die Umschaltung sehr schnell geleistet werden kann, wird die Sprachqualität durch diese Verluste nicht entscheidend gemindert. Wegen der fehlenden Synchronisation zwischen Sender und Empfänger wird dieses dynamische Multiplexverfahren als „asynchron“ bezeichnet.
  • Un sistema TASI (Time Assignment Speech Interpolation) es un sistema de concentración de circuitos con tiempo compartido, basado en el principio de interpolación de la palabra. Cuando un abonado comienza a hablar se le conecta a uno de los canales libres. Si hay unos pocos abonados más que canales, ninguno de los abonados necesitará ser interpolado después de que su conexión inicial se establezca, en base al concepto de probabilidad de tráfico. Cuando hay bastantes más abonados que canales, el equipo conecta muy rápidamente a los abonados que están activos y desconecta aquellos que se encuentran en silencio en ese momento. Por turno, a los abonados desconectados se les asigna a otros canales, momentáneamente inactivos, para cuando empiecen a hablar de nuevo. Un abonado se desconecta sólo cuando está en silencio. Existe siempre la posibilidad de que haya más abonados buscando acceso a los canales que canales disponibles en ese momento. En ese caso la palabra de los abonados será recortada. Esto sólo es práctico para grupos grandes de abonados y canales. La ganancia en eficiencia depende del porcentaje de tiempo total que el abonado esté realmente hablando y de la fracción de recorte (porcentaje total de pérdida de palabra tolerable).
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