Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
1998-12-08
2002-04-09
Bost, Dwayne (Department: 2681)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S174100, C714S704000, C714S706000
Reexamination Certificate
active
06370366
ABSTRACT:
Transmission system comprising at least a satellite station and a connection station, a station including a speech message correction device and a method of improving the quality of speech messages.
FIELD OF THE INVENTION
The present invention relates to a transmission system comprising at least a satellite station and a connection station for connecting the system to a switched network, in which system at least one of said stations includes means for receiving speech messages transmitted in frames and a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission.
The invention likewise relates to a station suitable for such a system, which station includes a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission.
The invention also relates to a method of improving the quality of speech messages.
The invention finds interesting applications in the domain of portable radio telephones complying with the GSM and other standards (DCS . . . etc.).
BACKGROUND OF THE INVENTION
Such a system is known from U.S. Pat. No. 5,687,184 in which at least one of the stations includes a message correction device which already notably improves the quality of the messages heard.
SUMMARY OF THE INVENTION
The present invention proposes a system of the type defined in the opening paragraph, which certainly still more improves the quality of the messages received in poor transmission conditions.
For this purpose, such a system is characterized in that the speech message correction device includes a counter of bad frames, an attenuation circuit for diminishing the amplitude of the speech signals for a count of said counter that is higher than a predetermined value.
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Bost Dwayne
Gelin Jean A
Halajian Dicran
U.S. Philips Corporation
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