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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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CS4270 Arkusz danych(PDF) 27 Page - Cirrus Logic |
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CS4270 Arkusz danych(HTML) 27 Page - Cirrus Logic |
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27 / 48 page  DS686A1 27 CS4270 5.2.8 De-Emphasis One de-emphasis mode is available via the Control Port and is optimized for 44.1 kHz sampling rate. 5.2.9 Oversampling Modes The CS4270 operates in one of three oversampling modes based on the input sample rate. Mode selec- tion is determined by the FM_&_M/S_Mode[1:0] bits in the Functional Mode register (03h). Single-Speed mode supports input sample rates up to 54 kHz and uses a 128x oversampling ratio. Double-Speed mode supports input sample rates up to 108 kHz and uses an oversampling ratio of 64x. Quad-Speed mode supports input sample rates up to 216 kHz and uses an oversampling ratio of 32x. See Table 10 for Con- trol Port Mode settings. 5.3 De-Emphasis Filter The CS4270 includes on-chip digital de-emphasis. Figure 11 shows the de-emphasis curve for Fs equal to 44.1 kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sample rate, Fs. Please see Section 5.1.7 for the desired de-emphasis control for Stand-Alone mode and Section 5.2.8 for control port mode. The de-emphasis feature is included to accommodate audio recordings that utilize 50/15 µs pre-emphasis equalization as a means of noise reduction. De-emphasis is only available in Single-Speed Mode. Gain dB -10dB 0dB Frequency T2 = 15 µs T1=50 µs F1 F2 3.183 kHz 10.61 kHz Figure 11. De-Emphasis Curve |
Podobny numer części - CS4270 |
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Podobny opis - CS4270 |
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