초록 ▼

A time division exchange provided with a plurality of compression circuits for carrying out signal compression in accordance with a plurality of compression laws and a plurality of expansion circuits for carrying out signal expansion in accordance with a plurality of expansion laws is operated in th

A time division exchange provided with a plurality of compression circuits for carrying out signal compression in accordance with a plurality of compression laws and a plurality of expansion circuits for carrying out signal expansion in accordance with a plurality of expansion laws is operated in the following manner. In a case where the exchange is used as an originating exchange, a compression circuit provided in the originating exchange for carrying out signal compression according to a desired compression law is selectively used at each time slot, and information on the desired compression law is sent out from the originating exchange. Further, in a case where the exchange is used as a destination exchange, an expansion law to be used on the receiving side is selected on the basis of the above information, and an expansion circuit provided in the destination exchange for carrying out signal expansion according to the selected expansion law is selectively used at each time slot.

대표청구항 ▼

A time division exchange system having a function of compressing information such as an input signal on the transmitting side and a function of expanding the information on the receiving side, comprising: an originating office; a destination office; and a tandem switch connected between said origina

A time division exchange system having a function of compressing information such as an input signal on the transmitting side and a function of expanding the information on the receiving side, comprising: an originating office; a destination office; and a tandem switch connected between said originating office and said destination office to effect communication therebetween, said tandem switch including: (a) at least one compression means for compressing information such as an input signal in a accordance with one of a plurality of compression laws; (b) at least one expansion means for expanding information such as an input signal in accordance with one of a plurality of expansion laws; and (c) switching means for applying the to-be-compressed information selectively to compression means which carries out signal compression according to a desired compression law, at each time slot, and for applying the to-be-expanded information selectively to expansion means which carries out signal expansion in accordance with an expansion law corresponding to the desired compression law, at each time slot; (d) means for counting the frequency of each compression law and for sending compression career information to the destination office; and (e) means for receiving compression career information from the originating office and for judging whether or not received compression career information meets a predetermined condition and for preventing further signal compression when the received compression career information fails to meet the predetermined condition.