The Zero-Crossing rate threshold for a voiced/unvoiced decision

1. How do you calculate zero crossing rate?
2. What are zero crossing rate used for?
3. How to identify voiced and unvoiced speech using short time energy and short time zero crossings?
4. What is zero crossing in Java?

How do you calculate zero crossing rate?

The function subtracts the Level value from the signal and then finds the zero crossings. If you do not specify Level , the function uses the default value of 0 and returns the zero-crossing rate. Example: zerocrossrate(x,Level=1) returns the rate at which the input signal x crosses 1 .

What are zero crossing rate used for?

Zero crossing rate (ZCR)—This technique is most widely used in time domain audio signal analysis [9]. It provides information about the number of times the signal crosses the horizontal axis. The amplitude value of the consecutive samples is compared for the differences in signs of the amplitude values.

How to identify voiced and unvoiced speech using short time energy and short time zero crossings?

A reasonable generalization is that if the zero-crossing rate is high, the speech signal is unvoiced, while if the zero-crossing rate is low, the speech signal is voiced [11]. The choice of the window determines the nature of the short-time energy representation.

What is zero crossing in Java?

It seeks out points in the signal stream where the digital signal of an image passes through a pre-set '0' value, and marks this out as a potential edge point. Because the signal has crossed through the point of zero, it is called a zero-crossing. An example can be found here, including the source in Java.