2007年10月31日星期三

Comparing WMA10 Pro formats at middle-high and high bit rates(96Kbps-256Kbps)

In the last article (see http://jilluh.blogspot.com/2007/10/amazing-test-mp3oggwma10-pro-format.html), I’ve compared Mp3, OGG and WMA10 Pro formats at low bit rates---64kbps that the WMA10 Pro (64kbps) reached an amazing high level (almost over 21000HZ) nearly to normal CD audio quality.

But this time I have tried to transfer the original file into WMA10 Pro formats with different profiles in order to see that if WMA10 Pro codes also have high music performance at middle-high and high bit rates.








Conclusions:

1.WMA10 Pro CBR 96Kbps has a very nice frequency spectrum as well as WMA10 Pro CBR 64Kbps. Its figure looks quite similar to the WMA10 Pro CBR 192Kbps,actually it's even a little bit better, e.g., it provides high quality of music with smaller size. No doubt, it's a very good choice for streaming media.

2. The performance of WMA10 Pro 128Kbps and WMA10 Pro 160Kbps are obviously pretty disappointing, their highest frequencies are even much lower than WMA10 Pro 96Kbps, although the WMA10 Pro 256Kbps shows a great spectrum as the original(its size might not be satisfied).

3. Eventually we can call WMA10 Pro----the killer at lower bit rates instead of Ogg, that is, of course, questionless.

2007年10月30日星期二

Amazing Test---Mp3,OGG,WMA10 Pro format comapring at low bitrates!

I use the sample music WES - Alane (Radio-Mix).wave (size 38Mb, CD Name: Summer Time Hits 3rd CD) as the source file to test. Then I've transferred it to different formats at low bitrates 64k bps:


Then I use the wave editor to generate their frequency spectrums.


The original wave spectrum:


The mp3 wave spectrum:


The ogg wave spectrum:


The WMA wave spectrum:


Conclusions:
1. Apparently the MP3 frequency reaches maximal approximately 12000Hz, which is very unsatisfactory to listen as voice instead of general music. Comparing with mp3, OGG reaches highest frequency of 16000Hz, this is much better than MP3 (its quality almost reaches the level of MP3 at 128kbps, which can be frequently heard from the official website as well as some official audio testing). So it is not surprised that a lot of audio magazines call the OGG format the killer at low bit rates (<128kbps)>
2. What a great surprising is that, the WMA amazingly reaches the highest frequency of 21000Hz! It nearly fits the original wave unbelievably. So the new WMA10 Professional codes which is promoted by Microsoft is really powerful, it theoretically provides much higher quality of music at smaller size at 64kbps comparing to OGG format(from the figures) as well as its former WMA9. However, the open source project OGG music format is becoming more popular currently and it’s expected that it will replace the MP3 in the future, as long as more content providers or music companies give support.


3. For voice or stream application, it is pretty wise to choose WMA10 or OGG, but the popularization of WMA10 may still have a long way to go because of its patent fee, unlike OGG---an open source format can be accepted much easily by electronic manufactures.

Therefore quality ranking: WMA10 (64kbps)>OGG (64kbps)>MP3 (64kbps)
WMA10 Pro: ++++++
OGG: ++++
MP3:++

Attachment:
The same sample music file is transformed using WMA9 codes; it’s only a little bit better than mp3 above.


Links:
Lame MP3: http://lame.sourceforge.net/index.php
OGG Vorbis: http://www.vorbis.com/
WMA:http://www.microsoft.com/windows/products/winfamily/mediaplayer/default.mspx

2007年10月29日星期一

Gmails attachments-limit up to 20M !

Fortunately i found that the gmail's limit of attachment is already up to the 20M now! see the help of Gmail wesite: http://mail.google.com/support/bin/answer.py?answer=8770&topic=1517

"What's the maximum attachment size?
With Gmail, you can send and receive messages up to 20 megabytes (MB) in size. However, the precise amount allowable will depend on the attachment."

2007年10月8日星期一

Adoration for Japan---The German’s love-knot

After I was trying to make new friends here with full of energy and time, I got something that makes me very disappointed and depressed. Apparently, it’s not the great friendship, it is the prejudice. I was too naive and ignorant to make the decision to know more local friends here and I was ever so expecting to obtain something new and different among the communities. Almost every time I was well behaved or I showed my knowledge and experiences, I was always getting this question from the surrounding: “Kommst du aus Japan? (It means do you come from Japan?) Or sometimes they told you unbelievable directly their experiences about Japanese food or Japanese culture without the previous question. You can hardly believe, how I was feeling at that situation, firstly surprised, then pleased and last sad!

There is one story I have to tell. It happened actually on a Japanese girl in my former German language school who was learning with me together in the same class. She was one of my best Japanese friends. She came to Germany for a long holiday for about one year and I was so lucky to know her in our language school. I must say, we really had a very good time not only in learning but also in traveling. At last she had to leave Germany for her home, so I came to the Airport to say goodbye to her. Of course she has already several friends there, a middle-aged German woman, who is her room hirer; a young Japanese girl and a young Japanese guy, who were both learning in my language school. I don’t know why the German woman was so excited and moved with tears in eye, especially when my friend was leaving. Until today I have no idea what has happened to them and what for a particular relationship between the two women, actually a young girl and an old women? Like a daughter and mother or other roles unusual? As I know, my Japanese friend has already boyfriend, so the case of other roles should be nonsense, at least in sex. Perhaps they are very very close friends, is that the reason? But just one year is enough to let the German woman cry for the leaving of my Japanese friend? It sounds really crazy, otherwise there is another explanation: she is too sensitive. Even it has some logics in certain sense, but how could a middle-aged women, who has a daughter in the high school, cried just for a room renter---a Japanese girl, just because of her leaving? Now take a consideration about my situation: I have lived in small room in a big house which is owned by my landlord---a 35 year old German woman over 16 months, and we are really very close friends. As a matter of fact, I had celebrated a lot of party in her house. Of course, I never forgot to invite her every time. A small party might not take much money, but it takes much time and energy for cooking Chinese food. On the day I was moving out, she was quite warm to say goodbye to me and I asked her for some help for transporting my new furniture. She really did later as a normal good friend and I was really appreciated for her favor, however, I noticed that she never really gave me a touching feeling. It seems that she did me some favors just in the way of manners as a hirer.

To be honest, she is the one and only good and best German friend of mine until now! At least it is the greatest comfort for me, since I tried different ways to learn new German friends with my own coins and seconds, which has been proved a great failure actually, because most of them have very strong prejudice against me---a Chinese guy. So I have become smarter now and I never want to beg for their friendship or something, on the contrary, I have begun to look down upon them. Currently I’ve got dozen of American friends.