Method of and circuit arrangement for inserting dialling intervals between stored dialling digits

US4769835A · kind A · utility

Assignee

• U.S. Philips Corporation · US

Inventors

• Peter Hirth · Rösrath, DE
• Werner Frerichs · Eckental, DE
• Hubert Grucza · Nürnberg, DE

Key dates

• Filing date: Feb 18, 1986
• Grant date: Sep 6, 1988
• Expiry date: Feb 18, 2006

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M1/27485
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method and apparatus for providing dialling intervals in dialling sequences indirectly dialled by a register in which such sequences are stored, such intervals being in accordance with the dialling intervals produced by a user during direct dialling of such sequences. Direct dialled subscriber numbers which include a dialling interval after at least one digit therein, such as for line access, are stored in a reference memory along with such interval. Upon an indirect dialling of such sequence from a redial or abbreviated dialling register, a microprocessor in the telephone set compares such sequence digit by digit with sequences stored in the reference memory, and if there is a match inserts in the dialled sequence the dialling interval in the matching stored sequence. By counting the number of such agreements for each stored sequence of dialling digits, the sequence having the lowest count value can be erased from the reference memory and replaced by a new dialed sequence having a dialling interval, thereby reducing the necessary storage capacity of the reference memory. A dialling interval in a stored sequence is altered in accordance with the interval inserted by a user each t…