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参数资料
| 型号： | MAS3519F |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | Codec |
| 英文描述： | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| 中文描述： | 新加坡金融管理局35x9F的MPEG 2 / 3层，AAC音频解码器，G.729的附件A编解码器 |
| 文件页数： | 50/92页 |
| 文件大小： | 1186K |
| 代理商： | MAS3519F |
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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]
00
hex
7F
hex
MB off (default)
maximum MB
The MB effect strength can be adjusted in 1dB steps. A value of 40
hex
will
yield a medium MB effect.
MB_STR
00 23
MB Harmonics
bit[15:8]
00
hex
64
hex
7F
hex
no harmonics are added (default)
50% fundamentals + 50% harmonics
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
3
...
30
20 Hz
30 Hz
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
MB off
MB on
0
1
bit [0]
reserved,must be set to zero
MB_SWITCH
Table 3–16:
Codec control registers on I
2
C subaddress 6C
hex
, continued
Register
Address
(hex)
Function
Name
相关PDF资料 |
PDF描述 |
|---|---|
| MAS3529F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3539F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3549F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3587F | MPEG Layer 3 Audio Encoder/Decoder |
| MAS7848L | RDS MODEM / MANCHESTER DECODER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAS3529F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3539F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3549F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3559F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3587F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:MPEG Layer 3 Audio Encoder/Decoder |
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