The spectrum of the musical signal. Part 3. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Speakers
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It turned out that the spectrum of "Races" performed by Yello almost without deviation repeats the spectrum of pink noise - the standard of uniform energy distribution. So the value of this recording for testing audio equipment was not just confirmed, but received (almost accidentally) a natural science justification.
Such an instrument will be played in ANY audio system by at least two speakers in each channel.
However, in general, science is not far from reality in terms of the spectrum, and therefore standard curves can be used as the basis for such an important, by all accounts, factor in the design of a car audio system as power distribution over frequency bands. This is most important for automotive systems, where channel-by-channel amplification is far from exotic. To the right of "Yello" is a curve of recommended power distribution over frequency channels, based on the "old" and "new" curves of the standard music spectrum.
"Races" Yello is an example of a uniform spectrum.
Power distribution over frequency bands with ideal filtering.
The schedule is quite working and practical. Using it is simple: note the values of the frequencies of the division of the bass, midrange and treble bands (in our example - 300 Hz and 3 kHz). The ordinate of the first interface will show the percentage of power attributable to the LF channel, between the frequencies of the LF / MF and MF / HF sections - to the mid-frequency, and the rest - the power of the HF channel as a percentage of the total. For a two-way system, the procedure is, of course, even simpler.
For the sake of order, the graph gives recommendations for both the current IEC/DIN standard (purple) and the old IEC (without DIN) that has fallen into the realm of legends. According to the old standard, it turned out that at a crossover frequency of 2 kHz and higher, the HF channel accounts for 5 percent of the total power. According to the modern, "hippie" curve with the same crossover frequency, it is proposed to divert 20 percent of the power to HF, no less. Both, be careful, are valid under the condition of ideal separation of the bands, that is, separation with filters of infinite slope, so that only the part of the spectrum due to it gets into each channel. In real conditions, this is not the case, and depending on which filters are applied, more or less "foreign" frequencies will fall into the channels. And they obey the spectral distribution curve, so the result is not so obvious as it would be if we listened to pink noise instead of music. We will illustrate what happens by riding on the works of our eminent and experienced colleagues.
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Literature
- Magazine "Autosound" № 11 / 2000
Author: Andrey Elyutin; Publication: avtozvuk.com
See other articles Section Speakers.
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