Telephone conversion unit with multiple memory system

Details Telephone conversion unit with multiple memory system Telephone conversion unit with multiple memory system

1975-06-30

1977-02-15

Robinson, Thomas A.

179 16AA, H04M 144

Patent

active

040083802

ABSTRACT:
A telephone conversion unit for substitution in a standard rotary dial telephone is disclosed wherein a keyboard coded telephone number is converted to a serial pulse train which simulates that generated by a standard telephone rotary dialer unit. The converter includes a keyboard switch having at least 10 keys for generating signals corresponding to each key depressed. An electrical encoder converts the signals into a four bit parallel signal with each encoded signal uniquely identifying a depressed one of the 10 keys of the keyboard. A dialer circuit means converts the encoded signal to a serial pulse train corresponding to the respective keys depressed. Power for the conversion unit is provided by converting the telephone line current coupled to the telephone unit when the hook switch is closed to a voltage suitable for powering the converter unit. A memory means is provided wherein when a memory control key of the keyboard switching means is depressed, the number keyed is stored in a location of the memory selected by the subsequent depression of one of the keys of the keyboard. The number can be retrieved from memory and coupled to the dialer means by momentarily depressing the memory control key and the key which addresses location in memory in which the number to be dialed is located. Mechanically the conversion unit together with the memory means can be positioned in a standard dial telephone unit by substitution of the conversion means in place of the dialer.

REFERENCES:
patent: 3536853 (1970-10-01), Tate
patent: 3601552 (1971-08-01), Barnaby et al
patent: 3860765 (1975-01-01), McCabe et al.
patent: 3885108 (1975-05-01), Zock

Affiliated with

Also associated with

Rating

Telephone conversion unit with multiple memory system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone conversion unit with multiple memory system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone conversion unit with multiple memory system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1438445