Abstract: A method and apparatus of suppressing a vocoder noise are provided. The method includes receiving from a channel decoder a vocoder frame and first information, the first information indicating whether the vocoder frame has an error, generating speech data by performing voice decoding on the vocoder frame, determining whether a tonal noise has been detected in the speech data, if the first information indicates that the vocoder frame has an error, and attenuating the volume of the speech data and outputting the volume-attenuated speech data through a speaker, upon detection of the tonal noise in the speech data.

Abstract: A method and apparatus of suppressing a vocoder noise are provided. The method includes receiving from a channel decoder a vocoder frame and first information, the first information indicating whether the vocoder frame has an error, generating speech data by performing voice decoding on the vocoder frame, determining whether a tonal noise has been detected in the speech data, if the first information indicates that the vocoder frame has an error, and attenuating the volume of the speech data and outputting the volume-attenuated speech data through a speaker, upon detection of the tonal noise in the speech data.

Abstract: A method for coating a chain comprised of a plurality of rings and connected to one another, including the steps of: preheating the chain at 200° C. for about 1˜2 minutes; dipping the preheated chain with coating liquid mixed with given liquids; heating the dipped chain at approximately 150˜350° C. for 1˜2 minutes; refrigerating the heated chain by the atmosphere temperature; and coating the chain.