audio
Audio
Hello Friends!
Here some basic properties of Audio formats..
What is MONO? [Single Channel (ie one speaker audio)]
Mono or monophonic describes a system where all the audio signals are mixed together and routed through a single audio channel. if you use two speaker to play a mono audio, both the left and right speaker audio are the same.
What is STEREO? [Two Channel (i.e two speaker audio)]
True stereophonic sound systems have two independent audio signal channels. Two Seperate audio tracks in a single audio file, plays at the same time. You can make a audio file that plays one song in left channel and other song in the right channel. MP3 is a two channel stereo Audio format,
Example:
Stereo Audio
Mono Audio
What is 5.1 Audio? [6 Channel (i.e 5 speaker audio and 1 subwoofer)]
Dolby Digital, or AC-3, is the common version containing up to six discrete channels of sound. The most elaborate mode in common usage involves five channels for normal-range speakers (20 Hz – 20,000 Hz) (right front, center, left front, right rear and left rear) and one channel (20 Hz – 120 Hz) for the subwoofer driven low-frequency effects. Mono and stereo modes are also supported.
The six channel(track) are independent of each other. Except the Sub-woofer channel, we can make an audio file that plays 5 different audio in five tracks (right front, center, left front, right rear and left rear). Subwoofer is for low frequency effects.. Remember the all 6 audio tracks are mono, 2 audio tracks are combine to produce stereo effect. All the 5+1(woofer) are combined to produce surround sound. Note all are not extracted using algorithms to produce surround sound, all are really different audio tracks. I think now u can imagine how a real 5.1 Surround sound could be,
Here one 5.1 audio example (Manjal velyil malai song from vettaiyadu villaiyadu)
Note: 5.1 audio format file extension is .ac3
(then how to say 5.1 DVD Mp3???)
We can extract audio (i.e .ac3, 5.1 audio file) from original 5.1 DVD using DVD Ripper Wizard
We can extract all the 6 tracks in different .wav (only) file using DVD Audio Extractor. Then combine both the front left and right channels to make karaoke audio using Sony Sound Forge, CoolEdit, Nero SoundTrax etc.
More Details
Stereo vs Mono:
The terms stereo and mono are often used when referring to amplifier connections. A stereo amplifier has two independent channels, one left and one right. The left and right signals of the stereo signal are similar but not exactly the same. The two channels are used to give the audio a sense of depth. If one instrument or voice is only produced in the left channel, it will seem to originate from the left side of the listening area. If a particular sound is only slightly louder in one of the channels, that sound will seem to originate off center slightly toward the channel in which the sound is louder. If you have two speakers but supply mono signal to both of them, there will be no sense of separation or depth. If a mono signal fed to both channels of a stereo amplifier, with a speaker on each channel, the output will mono. If a stereo signal is fed to the same amp/speaker set up, the output will be stereo. If a speaker is bridged onto a stereo amplifier, the output of the speaker will be a mono output, even if the signal fed into the amplifier is a stereo signal. Even if 2 speakers are bridged onto the amplifier, the output will still be mono because the output from each speaker has the same content.
Note:
In the following diagrams, 'X', 'Y', and 'Z' are the different sounds (instruments, vocals...) in the audio. The red letters are where the signal 'appears' to originate from and the yellow letters are where they are being reproduced.
Mono with one speaker:
In this diagram, the speaker is directly in front of the listening position and the audio appears to (and does) originate from the speaker.
Mono with 2 speakers:
In this diagram, you can see that the same signal is reproduced by both speakers. Since the signal content going to each speaker is precisely the same, this is a mono system. If the level of the signal is the same in both speakers, the signal will appear to originate precisely in the center of the speakers.
Below, you can see that the signal content from each speaker is the same but it is slightly louder in the right channel. This means that it will seem to originate a little to the right of center.
Stereo audio:
In this diagram, you can see that the 'x' portion of the audio is reproduced equally in both channels and appears to originate in the center of the 2 speakers. The 'y' portion of the audio is only in the left speaker and appears to originate from the left speaker's position. The 'z' portion of the audio is only reproduced by the right speaker. This means that it will appear to originate from the right speaker's position.
Below, you can see that the 'y' portion of the audio is produced in both channels but is at a reduced level in the right channel. This will cause the 'image' of the y part of the audio signal to appear to originate from left of center (not the far left or the center). This is how the audio 'stage' is reproduced with a stereo signal (different signals are recorded/reproduced at different levels in each of the speakers).
Make Karaoke of your Own
Hello Friends !
Analogx Vocal Remover tool (a plugin for WINAMP media player) to make karaoke songs from mp3 files.
Click Here to Download Plug-in
How to use :
Step1: Install the tool in the [ C:/program files/winamp/plugins/] plugins folder.
Step2: Start Winamp Media player and Select Options=>preferences (ctrl+p)
Step3: In the left side tree navigator Select "Plug-ins=> DSP/Effect"
Step4: Select AnalogX Vocal Remover (dsp_vr.dll)
Step5: You can view a "MIX" vertical control bar, increase the mix level to decrease the voice level.
Note: Increasing the mix level decreases the stereo effect also. if the level of mix is high the audio is like mono, because the algorithm combines both the left and right channels of the audio file and gives difference as output. you can't make karaoke using a mono audio or for old songs..
Thank you..