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MAS3559F Datasheet(PDF) 50 Page - Micronas

Part # MAS3559F
Description  MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec
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Manufacturer  MICRONAS [Micronas]
Direct Link  http://www.micronas.com
Logo MICRONAS - Micronas

MAS3559F Datasheet(HTML) 50 Page - Micronas

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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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