Repertory dialer with efficient data storage
US4503291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1984 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Jun 12, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/6033
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Method and apparatus are provided for microprocessor controlled storage and dialing of telephone numbers and storage and access of associated data. Each entry includes a telephone number field and an associated data field. The two fields are differently encoded and thus enhance the storage efficiency by avoiding a requirement for field terminating characters. An operator provides particular entries which are matched with stored fields of associated data. Upon determining a match, the stored associated data is displayed and the associated telephone number may be automatically dialed. A three chip microprocessor set scans a keyboard, controls displays, and communicates with program and data storage units. The microprocessor is used in conjunction with integrated circuitry to detect the existence of a dial tone for a predetermined time. Multifrequency or pulse dialing of a number from storage may be effected by the inventive dialer. An interface circuit includes muting circuitry for either multifrequency tones or pulses. A power supply circuit includes a trickle charging circuit for battery backup and circuitry to prevent access to, and alteration of, memory storage in the event of po…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.