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Get Acoustics and Hearing PDF

By Peter Damaske

ISBN-10: 3540782273

ISBN-13: 9783540782278

If you hearken to track at domestic, you must have an acoustic influence as regards to being within the live performance corridor. this is often completed by means of a sophisticated two-loudspeaker process and digital dealing with of the indications. find out how to head-related sound replica and reception to get the unique effect is defined during this accomplished publication at the outer impact of listening to and the way to accomplish ideal stereo results. The booklet additionally introduces a idea of float thresholds.

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Extra resources for Acoustics and Hearing

Example text

1). These two points may explain the widely known fact that low frequency components are unimportant for the acoustical perception of directions. In any case, a limiting frequency of 340 Hz was chosen for the electronic filter. The compensation shall be constructed only above that frequency. As depicted in the schematic diagram of the compensation filter (Fig. 15) the low-frequency components of the signals are carried directly to the loudspeakers. The filter circuit is realized by analog techniques with the use of low noise operational amplifiers, mostly four in one case.

However, the filters actually realized are of the Butterworth type [27]. Since they both have the order four and equal cut-off frequencies, we have a simple phase relation. If ϕLP (f ) is the phase shift caused by the low-pass filter, the equation ϕHP (f ) = ϕLP (f ) + 2π is valid for the high-pass filter. However, the constant 2π makes no noticeable difference. Thus the signal components at the output of the compensation filter may be added without any phase problem. This important advantage comes at a cost, however, which is expressed in Fig.

1 contains about two perceived directions per subject. In the third experiment, each subject marked about six directions which are concentrated near two separate centres. 2 shows an intermediate case. 4 dB measured by Haas, or by imprecise answers from the 15 subjects. Both Figs. 3 concern the Haas effect, but the delayed sound component arrives from quite different directions in the horizontal plane. In both cases the delayed sound is very powerful, and yet the directions sub- 50 2 Powerful Onset of Reverberation jectively perceived can be assigned to the two objective sound components in equal parts.

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Acoustics and Hearing by Peter Damaske

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