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:
Mar. 02, 2004
Filed:
Sep. 14, 1999
Shinya Suzuki, Koriyama, JP;
Kimitoshi Takeuchi, Koriyama, JP;
Toru Yoshihara, Koriyama, JP;
Makoto Oohashi, Koriyama, JP;
Hitachi Telecom Technologies, Ltd., Koriyama, JP;
Abstract
A communication apparatus or connected to a PBX or and an ATM network , is provided with a DTMF signal detecting portion for detecting whether or not a DTMF signal is contained in a voice signal from the PBX or , a DTMF signal monitoring portion , a DTMF cell generating portion for coding and sending out a DTMF signal, a DTMF cell decomposing portion for decoding a coded DTMF signal and a DTMF signal generating portion for generating a DTMF signal on the basis of the information content of a decoded DTMF signal and sending out this DTMF signal to the PBX or , and the transmission side communication apparatus or codes a DTMF signal in a specified form and transmits the DTMF signal and the reception side communication apparatus or decodes the coded DTMF signal and, on the basis of this content information, restores the DTMF signal in a DTMF signal generating portion . By doing so, even in case of transmitting a DTMF signal by means of a communication apparatus performing a voice code compression, it is made possible for a reception side communication apparatus (PBX) to judge/recognize the DTMF signal without error.