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Ambiophonic Audio Player for the iPad

The Application implements Recursive Ambiophonics Crosstalk Elimination for audio reproduction and can be downloaded via the iTunes App Store.

ATTENTION:
Don't use Earphones!
You need to connect loudspeaker - closely separated - to experience Ambiophonics!
Limitations of the current version (v1.0):
- Just track by track playback
- No background playback
- If you experience unusual sounds during audio reproduction then double-click the "Home Button" to re
The Principles of Ambiophonics:
1.) Ambiophonics uses "Recursive Ambiophonic Crosstalk Elimination" to enable binaural listening
2.) The Speakers are positioned with a separation angle smaller than 20° (called Ambiodipol) instead of 60° used in stereo. No worries, in contrast to stereo, the sound stage goes far beyond the boundaries set by the speakers (up to 120°).
Reference:
1.) Ambiophonics has been invented by the Ambiophonics Institute: http://www.ambiophonics.org
2.) RACE (Recursive Ambiophonic Crosstalk Elimination) is a free algorithm made available by the Ambiophonics Institute.
Listening Experience:
The sound stage gets a strong deepness, height and wideness which creates a real three dimensional listening experience.
Locating a single sound source within the original stereo image is much easier with Ambiophonics. You're able to pinpoint each instrument in all three dimensions!
To achieve optimal cross talk cancellation Ambiophonics has a sweet spot (similar to stereo) along the median line where the sound stage has its best representation.
Key advantages in comparison to stereo:
1.) Elimination of Comb filtering effects and pinna direction finding errors.
2.) By having the speakers close together reflections by walls and the bass mode response of the room are much easier to control.
3.) The center presence is very stable and therefore always easy to locate.
Which records sound best?
In contrast to the standard stereo setup where spatially rich recordings that contain binaural cues with inter-aural time differences (ITD) loose their deepness, Ambiophonic plays back a much richer sound stage.
Many productions mix monaural microphones or direct sources between channels to create phantom images limited to inter-aural level differences (ILD), but even those recordings do get a wider and more precise sound stage with Ambiophonics.
Setting up your listening environment:
1.) Place your speakers in a separation angle of around 20°. The speakers do need a good phase response, but even simple single driver PC-Speaker work well.
2.) Set the application parameter to the following values:
- Race Attenuation: 2.2 dB (Defines the amplitude of the cancellation wave front)
- Center: 0 % (Sets the center presence)
- Delay: 68 micro seconds (Depends on the speaker separation angle)
- Leveling: -6 dB (Output attenuation to prevent digital overs caused by the Ambiophonic algorithm)
- Frequency Limited RACE (0-4.5kHz): ON (Applies Ambiophonics to a limited frequency range)
- Bypass: OFF (Allows the comparison between Ambiophonics and Stereo)
3.) Select a track from the iPod library
4.) Move along the median of the speakers until you find the best sound stage experience
5.) Adjust the parameter to match your listening environment
Technical Specification:
- 32Bit Digital Signal Processing
- Playback of none DRM-Protected audio files of the format 16Bit / 44.1kHz

Ambiophonic Audio Player for the iPhone

ATTENTION: 
Don't use Earphones!
You need to connect loudspeaker - closely separated - to experience Ambiophonics!

The Principles of Ambiophonics:
1.) Ambiophonics uses "Recursive Ambiophonic Crosstalk Elimination" to enable binaural listening
2.) The Speakers are positioned with a separation angle smaller than 20° (called Ambiodipol) instead of 60° used in stereo. No worries, in contrast to stereo, the sound stage goes far beyond the boundaries set by the speakers (up to 120°).

Reference:
1.) Ambiophonics has been invented by the Ambiophonics Institute: http://www.ambiophonics.org
2.) RACE (Recursive Ambiophonic Crosstalk Elimination) is a free algorithm made available by the Ambiophonics Institute.

Listening Experience:
The sound stage gets a strong deepness, height and wideness which creates a real three dimensional listening experience.
Locating a single sound source within the original stereo image is much easier with Ambiophonics. You're able to pinpoint each instrument in all three dimensions!
To achieve optimal cross talk cancellation Ambiophonics has a sweet spot (similar to stereo) along the median line where the sound stage has its best representation.

Key advantages in comparison to stereo:
1.) Elimination of Comb filtering effects and pinna direction finding errors.
2.) By having the speakers close together reflections by walls and the bass mode response of the room are much easier to control.
3.) The center presence is very stable and therefore always easy to locate.

Which records sound best?
In contrast to the standard stereo setup where spatially rich recordings that contain binaural cues with inter-aural time differences (ITD) loose their deepness, Ambiophonic plays back a much richer sound stage.
Many productions mix monaural microphones or direct sources between channels to create phantom images limited to inter-aural level differences (ILD), but even those recordings do get a wider and more precise sound stage with Ambiophonics.

Setting up your listening environment:
1.) Place your speakers in a separation angle of around 20°. The speakers do need a good phase response, but even simple single driver PC-Speaker work well.
2.) Set the application parameter to the following values:
- Race Attenuation: 2.2 dB (Defines the amplitude of the cancellation wave front)
- Center: 0 % (Sets the center presence)
- Delay: 68 micro seconds (Depends on the speaker separation angle)
- Leveling: -6 dB (Output attenuation to prevent digital overs caused by the Ambiophonic algorithm)
- Auto Leveling: ON (Automatic attenuation to prevent digital overs)
- Frequency Limited RACE (0-4.5kHz): OFF (Applies Ambiophonics to a limited frequency range)
- Bypass: OFF (Allows the comparison between Ambiophonics and Stereo)
3.) Select a track from the iPod library
4.) Move along the median of the speakers until you find the best sound stage experience
5.) Adjust the parameter to match your listening environment

Technical Specification:
- 32Bit Digital Signal Processing
- Playback of none DRM-Protected audio files of the format 16Bit / 44.1kHz

Ambiophonic App for Android

Click here to purchase the Neutron Player with built-in Ambiophonic capability.
Enjoy wide-stage 3D sound in the background while running multi-media sources such as games and videos.

Java-enabled 2/4 Channel Ambiophonic Transcoder

At Stephan Hotto's website you can download several free programs with control panels that use the RACE equations to cancel crosstalk.These Ambiophonic programs run under Windows, Mac or Linux. This transcoder enables one to play 5.1, DVDs, or SACDs through just 4 speakers and realize full uncompromised 360° localization. It may also be used to play 2 channel sources through 4 speakers resulting in more realistic sound fields. The secret is that these are Java enabled and thus are not OS dependent. You need to have JRE (JAVA Runtime Environment) installed or get it here: http://www.java.com/download/manual.jsp.

The 4 Channel Ambiophonic Transcoder has a listing that allows you to select both inputs and outputs such as a CD player and an external reproduction system.

The Ambiophonic Transcoders have a center sound boost control to allow Ambio reproduction to sound more like the stereo loudspeaker triangle which doubles the lower frequency sound level for mono or central sound sources. This accommodates stereophiles who prefer this boost. An optional high frequency bypass feature avoids processing high frequencies where no audible crosstalk exists avoiding unpredictable HF level and polarity errors for some arrangements or settings.

VST plug-ins available

Free VST Plugin Designed by Tamas Zsiros!

VST plugin implements the full RACE protocol including adjustable bypass frequencies. Included is a calibrate mode that provides a left-to-right panning noise signal facilitating the setting of the cancellation controls. Click here to download the plugin (note the plugin is contained in a zip file).

This VST version of RACE has two controls for recursive delay and attenuation parameters to adjust for a variety of speakers, listening room geometries, and recordings.with unusual stage properties such as 40 foot pianos. As with other RACE implements, needed for surround are two instances running of the VST plug-ins and hardware that supports 4.0 or 5.1 input and 4.x output. (Note: a 5.1 center input must be mixed into L & R front channels by setting the player to "no center").

Ambiophonic DSP

This is a very sophisticated version of RACE which includes a variety of novel adjustments to cope with unusual recordings, loudspeaker arrangements, or just personal preferences.  A user guide and ordering information can be obtained by going to www.filmaker.com/products.htm   Some non-vanilla RACE algorithms include Pop, Electro/game, Jazz/acoustic, Classical/movie, Wareing, and Bypass.  Wareing is an example of nonrecursive crosstalk cancellation and was used extensively before RACE became feasible.  A Zentrum control allows central soloists to be made louder or softer and a Space control boosts ambient content if desired.  There are also memory locations to allow custom configurations to be stored and recovered.  Two instances of this plugin can be used in surround sound applications or to enhance stage width and realism even when playing 2.0 media.