Comparison of the recognition performance of Korean connected digit telephone speech depending on channel compensation methods and feature parameters

채널보상기법 및 특징파라미터에 따른 한국어 연속숫자음 전화음성의 인식성능 비교

As a preliminary study for improving recognition performance of the connected digit telephone speech, we investigate feature parameters as well as channel compensation methods of telephone speech. The CMN and RTCN are examined for telephone channel compensation, and the MFCC, DWFBA, SSC and their delta-features are examined as feature parameters. Recognition experiments with database we collected show that in feature level DWFBA is better than MFCC and for channel compensation RTCN is better than CMN. The DWFBA+Delta_ Mel-SSC feature shows the highest recognition rate.