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According to the Nyquist–Shannon sampling theorem, a sample frequency of just 30,000 Hertz would not be high enough to render a digital signal comparable to the full analog original. It is therefore important for any audio codec to be able to fully reproduce this range. The frequency range of the human ear lies approximately between 20 and 20,000 Hertz. According to this theorem, the sample rate must be twice as high as the highest frequency of the sampled signal.
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The so-called Nyquist–Shannon sampling theorem provides guidelines for calculating how to best accomplish this. The question is then at what frequency these samples taken from the original analog signal need to be for the original to be adequately represented by its converted digital form. These small “bits” are the discrete language digital’s binary code speaks.
Sampling rate: When converting a continuous anlog signal into a digital sound file, samples of the original analog signal are taken at very short intervals. Why sampling rates and bit depth are so important The audio is transmitted at a bit depth of 24 with a maximum speed of 24.5 Mbit/s on a Blu-ray disc. Of course, the sound codec also works with more standard 5.1 surround and 2 channel stereo systems. For a 7.1 system, the sampling rate is 96 kHz.
The more channels a system has, however, the lower the sampling rate will be. Like its nemesis, Dolby True HD, DTS-HD Master Audio achieves a sampling rate of 192 kHz. Naturally, both Dolby True HD and DTS-HD Master Audio deliver excellent sound quality. Both Dolby True HD and DTS HD are lossless audio codecs developed to take advantage of the additional space afforded by Blu-ray discs for storing information, thereby bringing viewers (those with proper speaker systems, that is) a step closer to a real cinema experience.
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