Digital sound processing and sound recording are being discussed more and more as the system of the future. System parameters should be defined sufficiently early to ensure compatibility. One of the most important parameters is the necessary audio bandwidth. Listening tests have been carried out with low pass filters of different types and cut-off frequencies from 15 kHz up to 20 kHz. The results obtained lead to the conclusion: widening the transmission bandwidth from 15 kHz to 20 kHz (or more) is - as far as hearing is concerned - not necessary.
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