Voice coding and decoding in mobile communication equipment
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorToru Terauchi
Life of this patent
Estimating the term…
Abstract
Digital mobile communication equipment a voice power calculating section 12 for calculating the voice power of digital voice signals converted by the A/D conversion section 2; a noise level comparing section 13 for comparing the results from the voice power calculating section 12 with a threshold level indicating noise level, and for replacing the voice signals with other signals such as all “0” data or comfort noise when the voice signals are determined to be at noise level, a voice coding section 8 for coding the output of the noise level comparing section 13, and a forward error correction coding section 9 for conducting forward error correction coding.
Claims10
A digital mobile communication equipment provided with a Speech Coder and Decoder, said mobile communication equipment comprising:
- A/D conversion means for converting analog voice signals into digital voice signals divided into frames;
- voice coding means for calculating the voice power value of each frame of said digital voice signals from said A/D converter and, for each frame, outputting said digital voice signal as it is when the voice power value is equal to or greater than a predetermined value and outputting the digital voice signal as zero when the voice power value is smaller than said predetermined value;
- and
- forward error correction coding means for inputting the coded digital voice signals from said coding means and for outputting the coded digital voice signals on which forward error correction coding has been performed;
- wherein said digital mobile communication equipment controls a noise level of the digital voice signal by outputting the digital voice signal as zero for every frame having a voice power value smaller than said predetermined value.
A digital mobile communication equipment provided with a Speech Coder and Decoder, said mobile communication equipment comprising:
- forward error correction decoding means for performing forward error correction decoding to received frames of coded digital voice signals and outputting the decoded frames of coded digital voice signals thereof;
- decoding means for calculating the voice power value regarding each frame of the coded digital voice signals from said forward error correction decoding means and, for each frame, outputting the digital voice signal decoded as it is from the coded digital signal when the voice power value of the coded digital voice signals is equal to or greater than a predetermined value, and outputting signals as a voice power value of zero when the voice power value is smaller than the predetermined value;
- and
- D/A converting means for converting digital voice signals output from said decoding means into analog voice signals;
- wherein said digital mobile communication equipment controls a noise level of the digital voice signal by outputting the digital voice signal as zero for every frame having a voice power value smaller than said predetermined value.
Dependencies are inferred from the claim text.