Abroad has begun to phase out MP3, a new music revolution AAC + +! Taught you how ◆ ◇ - Qzone log
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3197210 2007 年 08 月 10 日 23:24 Reading (loading. ..) Comments (0) Category: Personal Diary
First of all introduced to the AAC:
eAAC +) in 2004, included the 6th version of 3GPP standards. According to 3GPP, it is MPEG-4 AAC, MPEG-4 SBR and MPEG-4 Apple currently only supports a hard drive-based MP3 format. AAC by Fraunhofer IIS-A, Dolby, and AT & T to jointly develop an audio format, which is part of MPEG-2 specifications. Algorithms used in AAC and MP3 is different algorithms, AAC through a combination of other features to improve the coding efficiency. AAC audio compression algorithm is far more than the previous capacity of some compression algorithms (such as MP3, etc.). It also supports up to 48 tracks, 15 bass tracks, and more kinds of sample rate and bit rate, multi-lingual compatibility, higher decoding efficiency. In short, AAC MP3 files can be 30% smaller than the premise of providing better sound quality.
AAC +
it is MPEG-2 AAC and SBR (Spectral Band Replication) bandwidth of extended revised version of the technology portfolio. HE-AAC is not to replace the AAC, but to extend voice quality MPEG-4, can lower the rate of transmission (32 kbps). Moreover, HE-AAC decoder can decode AAC.
To generate 48 kbps of the HE-AAC stereo, HE-AAC encoder generates two signals: one is the MPEG AAC 42 kbps signal, the other is 6 kbps in the SBR signal. Then, the SBR signal is placed in the auxiliary field in the MPEG AAC (MPEG-4 in the field is defined). Finally, a complete 48 kbps of MPEG-4 HE-AAC streaming. SBR on behalf of high-frequency components,
prada leather handbags, while the AAC on behalf of low-frequency components. HE-AAC decoder uses AAC and SBR the signal, resulting in full-frequency signal; and AAC AAC decoder uses only the signal, that is, only the low frequency component by its decoding.
HE-AAC can transfer the CD Stereo 48 kbps or 128 kbps, 5.1 channel This kind of efficiency, making it suitable for Internet transmission, or the mobile digital broadcasting. However, HE-AAC for high-delay characteristics, it does not apply to two-way communication applications.
AAC technology has been used in 2G and 2.5 phones. The AAC +, EAAC + were used in 3G phones.
immediately to the Beijing Olympics, then certainly a lot of foreigners, people have changed out of listening to MP3 AAC format, but you still listen to MP3 music format, is not the point ah soil ?
90% MP3 bit rate is 120, but the same bit rate (that is, the same sound quality, this you know it) AAC audio files are much smaller, For example it, such as a 5M with 120 bit rate MP3 to AAC conversion rate was only up to 2M, is not it save space? Similarly, AAC 160 bit rate equivalent to 360 bit rate MP3, but it will be two documents about the same size, but the sound quality but is the gap between heaven and earth! But we are generally seeking quality, so long as the best not the smallest! Having said that even then
people who do not understand the point to understand something of it! Comrades, we abandoned MP3 era,
mulberry handbag! Here I taught you how to convert to high quality MP3 sound quality of AAC.
first step: download Apple's free conversion software! Powerful, very good! The most important is also the player with a QUICKTIME Oh! Click here to download speed may be quite slow
Step two: Install the software that I need not say, after the installation is complete, open software, well, we can begin to set the software!
software to open the top after the point edit button, select the number of partial set,
paul smith bags, then select Advanced Options
figure is the software to convert the path to save the file after the location This set up their own home
good path, the point label in the Import tab to import using the selected
AAC, select custom settings, see next Figure:
I'll give you a high quality setting, where the rate is equivalent to 160 360-bit-rate MP3, good enough do not need big! But the file size will be about the same size as the original, smaller file if you want to own the same bit rate can be set. In accordance with the above settings finished,
prada handbags, sure,
mulberry handbags! Well, we set up the software even if done!
Now we can begin to transfer your audio files to the conversion of ACC!
This is very simple! Point software file button above, choose to add files to the database (if you want to transfer large files to select the Add Folder to Library), and then select the list you want to convert Select the file right click convert selection to AAC
Well, now you just set the path to find your convert AAC files on the phone to go now! How to! Oh, great sound quality? Oh,
tory burch bags, the joke is equivalent to 360 bit rate MP3 can not it! Ha ha!
course, it was transferred directly from the CD ACC is the most perfect! a friend questioned the MP3 format itself is detrimental to be increased up into the ACC?
Answer: Once that is done there is still much The improvement! only a small part of the not too low! best indeed transferred from the CD!
class can not move hands over the top of my ah! ?
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