Apparatus, method, and medium for distinguishing vocal sound from other sounds

A method of distinguishing a vocal sound, the method comprising:

• dividing an input signal into frames, each frame having a predetermined length;
• determining whether each frame is a voiced frame or an unvoiced frame and extracting a pitch contour of the frame;
• calculating a zero-cross rate for each frame;
• calculating parameters including time length ratios with respect to the determined voiced frame and unvoiced frame, statistical information of the pitch contour, and spectral characteristics, wherein the time length ratios include a local V/U time length ratio, which is a time length ratio of a single voiced frame to a single unvoiced frame, and a total V/U time length ratio, which is a time length ratio of total voiced frames to total unvoiced frames;
• determining whether the input signal is the vocal sound using the calculated parameters calculated, the calculated parameters are the zero-cross rate, the local V/U time length ratio, the total V/U time length ratio, the statistical information, and the spectral characteristics,
• wherein the method is performed using at least one computing device.

A non-transitory medium storing computer-readable instructions that control at least one computing device to perform a method for distinguishing a vocal sound, the method comprising:

• dividing an input signal into frames, each frame having a predetermined length;
• determining whether each frame is a voiced frame or an unvoiced frame and extracting a pitch contour of the frame;
• calculating a zero-cross rate for each frame;
• calculating parameters including time length ratios with respect to the determined voiced frame and unvoiced frame, statistical information of the pitch contour, and spectral characteristics, wherein the time length ratio includes a local V/U time length ratio, which is a time length ratio of a single voiced frame to a single unvoiced frame, and a total V/U time length ratio, which is a time length ratio of total voiced frames to total unvoiced frames;
• determining whether the input signal is the vocal sound using the calculated parameters, the calculated parameters are the zero-cross rate, the local V/U time length ratio, the total V/U time length ratio, the statistical information, and the spectral characteristics,
• wherein the method is performed using at least one computing device.