Title:
VOICE CODEC AND MOBILE COMMUNICATION TERMINAL
Document Type and Number:
Japanese Patent JP2003204305
Kind Code:
A
Abstract:
To reduce a periodic noise unique to a mobile communication terminal, superposed on a PCM voice codec from a transceiver, thereby realizing a good speech sound quality.
The PCM voice codec 70 detects the time-division operation timing of a high frequency signal processor 20 generating a periodic noise, based on information from a controller 100. A timing signal generator 77 outputs compensation pulses for call receiving and sending systems from memories 78, 79, respectively. Subtractors 74, 82 subtract them from regular digital signals.
Inventors:
MOCHIZUKI KOJI
Application Number:
JP2002002582A
Publication Date:
July 18, 2003
Filing Date:
January 09, 2002
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G10L19/00; G10L21/0208; G10L21/0224; H04B14/04; H04J3/00; H04M1/00; (IPC1-7): H04B14/04; G10L19/00; H04M1/00
Attorney, Agent or Firm:
Koichi Washida