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MAS3559F Datasheet(PDF) 50 Page - Micronas |
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MAS3559F Datasheet(HTML) 50 Page - Micronas |
50 / 92 page MAS 35x9F DATA SHEET 50 June 30, 2004; 6251-505-1DS Micronas Micronas Bass (MB) 00 22 MB Effect Strength bit[15:8] 00hex MB off (default) 7Fhex maximum MB The MB effect strength can be adjusted in 1dB steps. A value of 40hex will yield a medium MB effect. MB_STR 00 23 MB Harmonics bit[15:8] 00hex no harmonics are added (default) 64hex 50% fundamentals + 50% harmonics 7Fhex 100% harmonics The MB exploits the psychoacoustic phenomenon of the ‘missing fundamental by creating harmonics of the frequencies below the center frequency of the bandpass filter (MB_FC). This enables a loudspeaker to display frequencies that are below its cutoff frequency. The Variable MB_HAR describes the ratio of the harmonics towards the original signal. MB_HAR 00 24 MB Center Frequency bit[15:8] 2 20 Hz 330 Hz ... 30 300 Hz The MB Center Frequency defines the center frequency of the MB bandpass filter (see Fig. 3–5 on page 52). The center frequency should approximately match the cutoff frequency of the loudspeakers. For high end loudspeakers, this frequency is around 50 Hz, for low end speakers around 90 Hz MB_FC 00 21 MB Shape bit[15:8] 5...30 corner frequency in 10-Hz steps (range: 50...300 Hz) With a second lowpass filter the steepness of the falling edge of the MB band- pass can be increased (see Fig. 3–5 on page 52). Choosing the corner fre- quency of this filter close to the center frequency of the bandpass filter (MB_FC) results in a narrow MB frequency range. The smaller this range, the harder the bass sounds. The recommended value is around 1.5 × MB_FC MB_SHAPE MB Switch bit[7:2] reserved, must be set to zero bit[1] MB switch 0MB off 1MB on bit [0] reserved,must be set to zero MB_SWITCH Table 3–16: Codec control registers on I2C subaddress 6C hex, continued Register Address (hex) Function Name |
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