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Crossfeed we wzmacniaczu słuchawkowym


oldbeat

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Witam Wszystkich słuchawkowców

 

Drążąc temat wzmacniaczy słuchawkowych, zauważyłem w niektórych ( SPL Phonitor, Corda Cantate ) funkcje crossfeed.

Zasadę działania poznałem teoretycznie, natomiast jakie są konsekwencje brzmieniowe zastosowania tego układu nie wiem.

Czy ktos z Forumowiczów używa wzmacniacza słuchawkowego z crossfeedem i może mi wyjaśnić, jaki wpływ ma ten układ na:

a/ lokalizację instrumentów b/ budowanie sceny ( czy nadal słyszymy "w głowie" czy może inaczej ) c/ ogólną przyjemność słuchania produkcji średniej realizacyjnie( nagrania nazwijmy to "pokombinowałem sobie suwaczkami" , "ten jazgot gitar dobrze sie sprzeda" oraz " to co że nie słychać wokalu") :-)

 

Pozdrawiam

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Podpisuję się pod pytanie :-)

Z tego co wyczytałem efekt jest ponoć dość subtelny i słychać to tylko w niektórych nagraniach.

Spotkałem się też z opinią w necie, że użytkownicy wyłączają tą funkcę bo nie poprawia lokalizacji a spłyca scenę.

Oczywiście są też tacy co twierdzą że jest super.

Pewnie jak zwykle trzeba samemu sprawdzić :-)

Ja próbowałem z foobarem, bo do niego jest filtr, który jest ponoć dobry (trzeba go ściągnąć).

Nazywa się bs2b (Bauer stereophonic-to-binaural):

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Mnie jakoś na kolana nie powalił i obawiam się, że implementacja sprzętowa będzie podobna...

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Nieco teorii ze strony meier-audio.com

 

Directional listening

 

In normal daily life people use various mechanisms to locate sources of sound.

 

Firstly, the sound of a source to the right side of the listener (e.g. the right loudspeaker) not only reaches the right ear but, attenuated and delayed, is also heard by the left ear. The level of attenuation and the delay time of this crossfeed signal provide important directional information.

 

Secondly, the soundwaves are partly absorbed and partly reflected by the tissues of the head. Reflections at the oracles (pinnae) interfere with the soundwaves that directly enter the ear-channel and amplify or attenuate specific frequency components. Since these reflections depend on the direction of the soundwave the "color" of the sound changes with the direction of the source.

Thirdly, reflections of the soundwaves from the walls, ceiling and floor of our listening room produce reverberation that conveys an extra feeling of space.

 

The information obtained by these mechanisms is further refined by movements of the head. Changes in sound levels, delay times and sound color refine the sense of direction. For a demonstration, blindfold a friend and ask him to locate a ticking clock that you have hidden in the room. He will start turning his head although he can't see anything. With his head in a fixed position an exact localization is much more difficult.

 

 

Listening by headphones

 

All the mechanisms of directional listening are missing when we use headphones. The sound at the right ear will no longer reach the left ear and pinnae-reflections no longer interfere with the original soundwave. Moreover, the headphones are directly attached to our head, and so head movements no longer add information. Reverberation is also not present.

 

As a result, the sound heard by headphones seems to stick to the inside of our head and to our ears and an unnatural soundfield is created. The brain misses logical clues for direction and this subconsciously results in mental stress. Some people cannot tolerate this stress and are unable to use headphones.

 

The natural crossfeed filter

 

In principle, digital soundprocessors can simulate all the mechanisms for directional listening but the results are, thus far, not very satisfactory. In particular, pinnae-reflections are very complex and listener-specific and impossible to simulate accurately.

 

Fortunately, the mean directional information is provided by the time delay and level of attenuation of the sounds that reaches the opposite ear. The CORDA headphone amplifiers can electronically simulate this process and, with appropriate attenuation and delay, add some of the right audiosignal to the left channel and vice -versa. This considerably reduces the adverse symptoms of headphone listening.

 

A unique feature of the crossfeed circuitry of the CORDA headphone amplifiers is that it "recognizes" the virtual positions of the instruments and singers in a recording. The sound of an instrument in the middle of the soundstage will be equally present in both audio-channels and isn't given any crossfeed. A crossfeed signal is only generated for instruments that are not placed at the center. The more off-center the instrument is placed, the stronger the crossfeed and the longer its delay. This feature is called "natural crossfeed".

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