jetAudio 4
Product Information
- Overview
- Characteristics
- Requirements
- Supported file formats
- Screenshot
- Release Notes
jetAudio 6



  Digital Audio Component

I want to record Audio CD as MP3 format.
Use JetAudio Extension. JetAudio Extension has the Fast MP3 encoding engine. Using Digital Audio Extraction from CD mode, you can make MP3 with the original sound quality.

  No tracks or Only 1 track per session selectable for MP3 recording.
It is intentional not a bug. That is, It is the limitation of the JetAudio Adware, Trial or Light version. (the bundle license fee of the light version is so small under 1 dollars.)

Only the full version support the flexibility to select a particular CD track or to select all tracks for recording.

If you want to copy all of CD tracks, You should purchase the full version of JetAudio. (You can purchase the full version at the registration page.) or you should try to click the record buttons until your success.
  What is the VBR (Variable Bit Rate) encording in MP3?
Some audio passages are more difficult to encode than others. In order to maintain constant bitrate (CBR) during CBR encoding, difficult passages may be encoded with fewer than the desired number of bits with a consequent decrease in quality level relative to the average bitrate. During easy passages the encoder uses more than the necessary number of bits in order to maintain constant bitrate. In essence, fixed bitrate operation varies the quality level in order to maintain constant bitrate.

Conversely, variable bitrate (VBR) operation fixes the quality level and allows bitrate to vary. During difficult passages VBR uses a higher than average bitrate and during easy passages uses a lower than average bitrate. The net result is that VBR produces an overall higher, more consistent quality level compared to CBR at similar bitrates.
With CBR, you can compress the sound with fixed size no matter how it may be complicated or not. On the contrary, with VBR, you have to make the size of sound differ from others according to sound complexity.

For example, If 1 min's sound is so simple, you can compress it into 1 sec's amount. If the sound is complex, it may be compressed into 15sec's amount. In case of CBR, all 1 mins' sound is to be compressed into 10sec's amount. By reason of this, VBR is in a better position to make the sound which is much closer to the original sound than CBR.
  What is the Joint Stereo Mode in MP3?
> Dual Channel Stereo (mode 2)
Dual Stereo includes two independently encoded channels (left/right), each with half the total bitrate. In effect, it is two mono files packed into a single file. It is generally used for multi-lingual audio programs.

> Stereo (mode 0)
In the Stereo mode, left and right channels are independently encoded. The total bitrate remains constant, but the split between the channels can vary. The Encoder uses this flexibility to improve quality (compared to Dual Channel) by allocating more bits to the channel with the more dynamic signal.

> Joint Stereo (mode 1)
Joint Stereo mode allows the encoder to use other coding methods in addition to the independent channel coding used for modes 0 and 1. The encoder is not required to use any particular method, but is allowed to dynamically (frame by frame) choose the method that produces the best quality. In Joint Stereo mode the encoder is allowed three coding methods: independent channel, MS stereo, and intensity stereo.

MS stereo coding recognizes the fact that there is no sense in encoding the same information twice. MS stereo uses one channel to encode the portions of the left and right channels that are the same. The other channel is used to encode the differences between the left and right channels. The process is reversed at the decoder to reproduce the
original left and right channels. If the left and right channels have a large amount of commonality, ms coding can result in a large increase in compression efficiency and consequently improved quality.

Intensity stereo uses the results from psycho-acoustic experiments that indicate that not all of the information implicit in the left and right channels is perceptually important to the stereophonic image. By encoding only that portion of the information that is perceptually important, intensity stereo can produce overall improved quality at low bitrates. Current Xing encoder products do not use intensity stereo encoding at bitrates above 96kbps.

Joint Stereo Mode is the recommended default and will do just as well as the other stereo modes in almost every case. However, at higher bitrates in very special cases there may still be a need to apply the Stereo Mode.
  Too much echo/squeezed sound during playback MP3 file.
Adjust Reverb, 3D, Wide Controller in Sound Effect Component to fit the good sound to hear. If the sound is still too high or low, go to 'Preference'->[Digital Audio]->[Advanced...] and adjust [Output scale] value. Every MP3 file has different sound sale, so the most preferable value doesn't exist. But about 24000 is acceptable. In case you set using [Automatic Gain Adjustment], Jet Audio will adjust output scale automatically.
  Sound is cut off frequently during MP3 playing.
Select 'Preference'->[Digital Audio]->[Advanced...] and change [Wave Output Buffer Count], [Decoder Priority] value.
  What kind of engine should I use to play MP3 for multitasking?
"32 bit Mixed Mode Engine" is newly added as an MP3 playing engine of JetAudio. This Engine is very useful for multitasking cause it uses 32bit Floating Point Engine together with 32bit Fixed Point Engine by circumstances. If you want the best high-fidelity sound, "64 bit Floating point Mode Engine" is recommended.
  What is the Microsoft Windows Media Player?
Microsoft Windows Media Player is multimedia core software for Windows 95/NT. You can learn about it and download it for free from Microsoft web site and It is included in Microsoft Internet Explorer also. If you have installed the Internet Explorer latest version, you have Windows Media Player too. JetAudio uses Windows Media Player for sound effect and Digital Video playback.
  I want to save RA or MP3 streaming data in my hard disc.
The "Save Streaming" button on Digital Audio panel is for saving the MP3 streaming data.
There is no feature to save the RA streaming data in JetAudio. We will study about this problem more. But with the current version, there is no way. Please check the vendor of RA

If you want to save the MP3 streaming data, follow this step by step..

1. After Running of JetAudio, connect to the website that offers the MP3 streaming data.
2. Click the 'save streaming' button to turn on the streaming function.
3. Click the download link from that website.
    You can see the file's path and name on your browser's status bar.
    The extension of that file should be *.m3u.
4. When you click some download link.
    There are 2 option of Opening or Saving in your hard disc.
    In this case, you should select the Opening of that file.
5. Assign the folder and file name in your hard disc as you want to save.
6. You can hear that sounds, Saving it in your hard disc.
7. When it ends, Click the 'save streaming' button to turn off the streaming function.
  I recorded sound from CD to wave file, but it has no sound.
First of all. record something with the built-in recorder in Windows.
If you can't record any sound, It is the problem about your sound card driver or inadequate setting around your sound system. Reinstall you soundcard driver once again and test it.

If you have no problems with the built-in recorder in Windows.

You should check out the recording source on Mixer component.

First, check out the "Enable" condition of the recording source that you want to record. Click the [Record] button in the Mixer component of JetAudio. You can see many volume / selection controls of recording sources that your soundcard offers. (For example, Audio CD, Microphone, Line In, MIDI, etc....) If you want to record music from CD to WAVE file and do not want to record any noise, adjust the CD volume level and select, and do not select the others. If you select multiple recording sources, these sources will be recorded simultaneously.

Second, you should have sufficient hard disk capacity. If you record as 44.1 KHz, 16 bit stereo, it requires 10 MB / minute.

Third, check out internal wiring from CD-ROM drive to Soundcard. If you can hear audio CD through the speaker, It is O.K.

JetAudio supports synchronizing feature with audio CD. That is, when you record something from Audio CD, click the record button in the Digital audio component and select the audio CD track that you want, JetAudio plays audio CD when recording start, and stop when recording stops automatically.
  I recorded sound from CD, but it has much noise in it.
You should check out the recording source on Mixer component. Check Mixer Set up. If you click [Record] button at the right side of Mixer Component, recording devices will be displayed. Among these devices, check if the red-colored button below CD device. In case both Mic and CD select buttons are on at once, Mic sound will be recorded also. Don't forget to adjust Record level carefully.
  Recording using [Digital Audio Extraction] breaks out an error.
JetAudio supports these two kinds of recording modes - Analog Recording Mode and [Digital Audio Extraction] (called Digital Copy) Mode. You can use Digital Copy Mode only when you record from Music CD. It extracts digital data from the Music CD and transforms it into a music file. You can make a high-quality music file with this mode regardless of sound card or system performance, because it is not dependent on the mixer. Because [Digital Audio Extraction] mode operates hardware directly, it may not work on certain OS or CD-ROM Drives. In most cases, this problem occurs by CD-ROM compatibility. Use [Analog Recording] in this case.
  What is the Sector-Synchronization mode in Digital Copy.
1. Normal
The component reads the data from CD, then writes the data to the file. Some drives have problems to find the position where we must continue with reading, the allowed tolerance is +/- 2 sec. If you have such a drive then you should not use this mode because the drive looses it's position while we write the data.

2. Burst-Copy
In this mode we try to write to the file while we read from the CD so we have a continue data stream and the drive must not search the position again.

3. Sector-Synchronization
Should be Jitter correction, or not ? In this mode we try to synchronize the sectors between different reads from the device. This is useful if your drive can not find the positions correctly as described above.

4. Block Count
The number of blocks we read with a single device access. There is no general rule for the value, it differs from drive to drive. In most cases 26 blocks will work fine.
  Recording Audio CD to MP3, what is the most preferable option?
When you make MP3 with JetAudio Extension, You can have an option which makes you set sound quality and decide which one of 2 bitrates.

Please use default value recommended by JetAudio: 'Stereo', 'Variable bit rate', 'Average 128kbps - CD Quality', 'Use MPEG-2 encoding under 96kbps' option. Use '128-192Kbps' option, if you want to record MP3 with higher quality.

  How do I decode MP3 to Wav file ? (MP3 to Wav)
You can convert the MP3 file to the WAV file. You can convert the MP3 file either while you are playing it or convert it directly to the WAV file without playing it.
Click the preference (hammer-image and round) button on the left in the main component and select the Digital Audio tap. You can see the [Advanced] button

Click the [Advanced] button, and you can see the MPEG audio output option. If the .WAV is selected, the next time you hit the play button, MPEG Audio will be saved as the same file name in the directory you play, only with the file extension changed to .WAV.

If the "Don't ask .WAV file name" is not selected, an interface will pop up asking you want to name the WAV, and it decodes whenever you convert the file.
  I can not play RealAudio files.
JetAudio can playback all RealAudio file formats - *.ra,*.rm and *.ram. Moreover you can record sound to RealAudio format in real-time.
Because JetAudio 4.02 uses RealPlayer 5.0 engines for RealAudio play, it may not play files encoded with RealEncoder G2. In this case, please use the latest version of JetAudio.

If you playback any *.ram format file and JetAudio displays error message, you should make connection to Internet. Originally, *.ram format file works when you connect to Internet. If you have *.ra file whose size is smaller than 1 kbyte and which is the some text of link to some *.ra file location, It is *.ram file. Please change the extension with *.ram. On the contrary, If you have *.ram file whose size is larger than 100 kbyte, It is *.ra file. Please change the extension with *.ra.

Here is another tip. Click preference button in Main Component to open Preference dialog box. If you click 'Digital Audio' tab, you can find [Configure Real Media Engine] button. If you move to [Engine] tab with pressing [Configure Real Media Engine] button, you will know which engine you are going to use between Real Media Engine belongs to JetAudio and Shared Folder. If a problem happens to the playback with JetAudio's internal engine, please use Real Media Engine built in shared folder for playback.

  Is there any plan to support the VQF format?
So far we also are considering that VQF subjects. But there remains some license problems. As you knows, VQF was invented by Japanese company. We have to get some permission for that in order to develop something. However it has not been achieved.
  Can I record the sound from my cassette player?
It is possible. Just click the record button on the digital audio panel. The sequence is straightforward. the only important factor you should check is the recording source. not CD but line-in. Of course, you should connect the line-in input of your sound card with the line-out of your cassette player.
  MP3, WAV, RA Recording through MIC or Line IN.
Please check the following spcial page about how to record something through MIC.