Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate
2005-09-30
2010-12-07
Ramakrishnaiah, Melur (Department: 2614)
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
C379S090010, C379S093040
Reexamination Certificate
active
07848495
ABSTRACT:
A voice communication apparatus is interposed between a telephone set and a public switched telephone network (PSTN) or a broadband network which can provide a frequency bandwidth broader than a frequency bandwidth of the public switched telephone network. The apparatus selects one of the PSTN and the broadband network, from which a voice signal is input. The apparatus takes account of the selected network, frequency characteristics of the selected network and of the telephone set, and appropriately adjusts frequency characteristics of a voice signal transmitted between the telephone set and the selected network by means of transmitter and receiver band-pass filter units. As a result, both the telephone set and the counterpart communication terminal can receive a voice signal of better transmission quality.
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Akie Kazuyoshi
Aoyagi Hiromi
Takada Masashi
Farnsworth Todd R.
Oki Electric Industry Co. Ltd.
Ramakrishnaiah Melur
Satori Michael A.
Venable LLP
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