Data interface circuit for portable terminal equipment

Details Data interface circuit for portable terminal equipment Data interface circuit for portable terminal equipment

1995-08-24

1999-02-16

Woo, Stella

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 9328, 455557, H04M 1100

Patent

active

058728350

ABSTRACT:
A data interface circuit for portable radio terminal equipment having wire and radio data communication functions, thereby capable of being applied to a variety of communication systems. For a communication using a radio network, the signal type is changed from a differential-ended-signal (DES) type highly influenced by noise to a single-ended-signal (SES) type hardly influenced by noise by an operation of the radio interface unit, thereby enabling the redundancy to noise to be increased. Furthermore, it is possible to provide various audio services by the audio signal processing control unit.

REFERENCES:
patent: 4991197 (1991-02-01), Morris
patent: 5353334 (1994-10-01), O'Sullivan
patent: 5428671 (1995-06-01), Dykes et al.
patent: 5524047 (1996-06-01), Brown et al.
patent: 5602902 (1997-02-01), Satterlund et al.

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