Datenblatt-Suchmaschine für elektronische Bauteile |
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LM1894M Datenblatt(PDF) 6 Page - National Semiconductor (TI) |
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LM1894M Datenblatt(HTML) 6 Page - National Semiconductor (TI) |
6 / 10 page Circuit Operation (Continued) be. As long as the total energy of the noise is equal to or greater than the energy of the tone, the tone will be inau- dible. This principle may be turned around; when music is present, it is capable of masking noise in the same band- width. 2. The ear cannot detect distortion for less than 1 ms. On a transient basis, if distortion occurs in less than 1 ms, the ear acts as an integrator and is unable to detect it. Because of this, signals of sufficient energy to mask noise open band- width to 90% of the maximum value in less than 1 ms. Re- ducing the bandwidth to within 10% of its minimum value is done in about 60 ms: long enough to allow the ambience of the music to pass through, but not so long as to allow the noise floor to become audible. 3. Reducing the audio bandwidth reduces the audibility of noise. Audibility of noise is dependent on noise spectrum, or how the noise energy is distributed with frequency. Depend- ing on the tape and the recorder equalization, tape noise spectrum may be slightly rolled off with frequency on a per octave basis. The ear sensitivity on the other hand greatly in- creases between 2 kHz and 10 kHz. Noise in this region is extremely audible. The DNR system low pass filters this noise. Low frequency music will not appreciably open the DNR bandwidth, thus 2 kHz to 20 kHz noise is not heard. Block Diagram DS007918-7 FIGURE 2. DS007918-8 FIGURE 3. Output vs Frequency DS007918-9 FIGURE 4. −3 dB Bandwidth vs Frequency and Control Signal www.national.com 6 |
Ähnliche Teilenummer - LM1894M |
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Ähnliche Beschreibung - LM1894M |
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