Telephone power interruption data backup apparatus

Details Telephone power interruption data backup apparatus Telephone power interruption data backup apparatus

1992-08-19

1995-06-13

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

379 67, 379355, 379356, 379413, 365229, 369 15, 360 32, H04M 100

Patent

active

054250790

ABSTRACT:
A data backup apparatus for temporarily storing the data stored in a volatile memory using an internal battery when the main power is stopped. When the operation of the internal battery is started, the data stored in the volatile memory as a digital signal is converted into an analog signal by a D/A converter, and then it is stored in a magnetic storage unit. When the power supply is restored, the data stored in the magnetic storage unit as the analog signal is read out and converted into the digital signal, and then it is restored to the volatile memory.

REFERENCES:
patent: 4458307 (1984-07-01), McAnlis et al.
patent: 4935956 (1990-06-01), Hellwarth et al.
patent: 5182769 (1993-01-01), Yamaguchi et al.

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