Abstract
The human ear has a dynamic range of about 140 dB and a hearing bandwidth of up to 20 kHz. Therefore high-quality audio signals must match these characteristics. Before the analog audio signals are sampled and digitized, they have to be band-limited by means of a lowpass filter. Then analog-to-digital conversion is performed at a sampling rate of 32 kHz, 44.1 kHz or 48 kHz (and now also 96 kHz) and with a resolution of at least 16 bits. The 44.1 kHz sampling rate corresponds to that of audio CDs, 48/96 kHz are studio quality. While the 32 kHz sampling frequency is still provided for in the MPEG standard, it is in fact obsolete. A sampling rate of 48 kHz at 16 bit resolution yields a data rate of 786 kbit/s per channel, which means approx. 1.5 Mbit/s for a stereo signal (Fig. 8.1.).
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(2008). Compression of Audio Signals to MPEG and Dolby Digital. In: Digital Video and Audio Broadcasting Technology. Signals and Communication Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76358-1_8
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DOI: https://doi.org/10.1007/978-3-540-76358-1_8
Publisher Name: Springer, Berlin, Heidelberg
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