Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2000-12-28
2004-08-31
Tran, Cong Van (Department: 2683)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S213000, C455S219000, C455S226200
Reexamination Certificate
active
06785522
ABSTRACT:
PRIORITY
This application claims priority to an application entitled “METHOD FOR CHANGING TIMBRE DURING CONVERSATION IN PORTABLE TELEPHONE” filed with the Korean Industrial Property Office on Dec. 30, 1999 and assigned Ser. No. 1999-65748, the contents of which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a cellular telephone terminal, and in particular to a method for changing timbre of a voice signal during conversation in a cellular telephone terminal.
2. Description of the Related Art
In general, a vocoder of a cellular phone terminal has a filter, for example an FIR (Finite Impulse Response) filter, to improve timbre of voices which are transmitted and received during conversation. In other words, a filter coefficient of the FIR filter is suitably changed and the transmitted/received voices are accordingly equalized to improve the timbre.
However, the FIR filter provided in conventional cellular telephone terminals has been typically used only for improving the timbre during conversation, thereby degrading the efficiency of the source.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a method for changing timbre during conversation in a cellular telephone terminal.
To achieve the object of the invention, there is provided a method for changing timbre of a cellular telephone terminal having a filter for filtering a PCM input signal, said method comprising the steps of: waiting for a timbre selector key input for a desired timbre when a timbre converter key is inputted during conversation; and setting a filter coefficient of the filter correspondingly to the timbre selector key input and filtering the PCM signal to change timbre.
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Dilworth & Barrese LLP
Samsung Electronics Co,. Ltd.
Tran Cong Van
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