Switching system having tone trunk

Details Switching system having tone trunk Switching system having tone trunk

H - Electricity

04

Q

344/28

H04Q 3/42 (2006.01) H04Q 1/448 (2006.01)

Patent

CA 1246197

SWITCHING SYSTEM HAVING TONE TRUNK ABSTRACT OF THE DISCLOSURE A switching system having a tone trunk which stores, in the digital memory thereof, a predetermined digital tone signal in the form of digital codes for supplying the corresponding analog tone signal to telephone sets of subscribers. The digital codes have been coded in such a way that the analog tone signal is accompanied by a quantizing noise having a charac- teristic of white noise.

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