| 摘要 |
PROBLEM TO BE SOLVED: To provide a voiced sound/voiceless sound judging device capable of rapidly and correctly judging a voiced sound or a voiceless sound and being constituted with a simple circuit. SOLUTION: This voiced sound/voiceless sound judging device is constituted of a microphone 11 for inputting a voice, an amplifier 12 for amplifying the signal from the microphone 11 to prescribed amplitude, an A/D converter 13 for converting the signal from the amplifier 12 to a digital signal, a low-pass filter 14 for extracting the signal of a low band from the digitized signal, an amplitude average measuring instrument 15 for measuring the average of the amplitude in the prescribed time interval of the extracted low band signal, a number of zero-crossing counter 16 for measuring the number of zero-crossing of the digitized signal and a voiced sound/voiceless sound discriminator 17 for discriminating the voiced sound from the voiceless sound based on the outputs of the amplitude mean measuring instrument 15 and the number of zero-cross counter 16 and deciding the ratio of the voiceless sound to the input voice. |
