The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 1991
Filed:
Nov. 18, 1988
Applicant:
Inventor:
Naoki Tsumura, Yokohama, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ;
U.S. Cl.
CPC ...
379 88 ; 379 98 ; 379100 ;
Abstract
A digital signal processing device for processing signals in the audio-frequency band with using a digital input-output interface circuit, analog input-output interfaces as well as digital signal processing circuit for converting digital signals to analog signals and vice versa. A memory is used for storing various programs for processing MODEM functions, voice-coding/synthesizing and the like in the digital signal processor selectively employs either one of the MODEM function processing programs and the voice coding/synthesizing function program, both of which are stored in the memory in accordance with an external command.