Details Published on Monday, 13 August 2012 06:24 We humans have the ability to hear sounds in the range of 80 Hz to 14 kHz, which is pretty good considering the small size of the ears we were given. However, as we get older this range is reduced especially at the top end of the spectrum. The frequency band of normal human speech is much lower than this. Typically, the frequency for male speech ranges between 85 Hz to 180 Hz and for female it is between 165 Hz to 255 Hz. When we speak to someone on the phone the frequency reserved for the telephone call is in the range of 300 Hz to 3 kHz. This is just enough dynamic frequency to ensure the speech doesn't sound like it is coming from the moon or through an underwater pipe. Background and Codecs All digital speech uses the concept of a codec. The word “codec” is an abbreviation combination of coder and decoder. This process describes the algorithm, which digitally encodes and compresses speech samples, so they can be tra
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