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April 17, 2005
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Xmod står för X-Fi Module och är Creatives senaste tillskott på ljudmarknaden för datorer. Enheten är varken ett ljudkort eller ett högtalarsystem utan en enhet som kopplas in mellan dessa stationer. Xmod är inget tillbehör för dator med Creatives X-Fi ljudkort utan snarare ett medel för dem utan X-Fi att få bättre ljud ur sin komprimerade musik. Xmod kopplas in i datorn eller din portabla MP3-spelare och i andra änden av enheten kopplas sedan högtalare eller hörlurar. Xmod använder sig av liknande funktioner som Creative X-Fi ljudkrets för att rena en komprimerad audiosignal och målet med Xmod är just att få ut ett renare och bättre ljud ur dina enheter.
"It connects between stereo speakers or headphones and either a PC, Mac, iPod, ZEN™ or any MP3 player, and it dramatically improves the listening experience by upconverting the music during playback to the X-Fi Xtreme Fidelity standard - very high-quality 24-bit surround audio."
Det är i princip en extern modell av Creatives 24-bit Crystalizer som finns inbakad i X-Fi ljudkretsen. För den som vill veta mer om 24-bit Crystalizer och dess funktion kan ni läsa vår recension av Creative X-Fi. Creative hoppas helt enkelt att använda ska vilja förbättra ljudkvalitén i sin komprimerade musik och med Xmod ska man kunna göra detta även om man spelar upp materialet på olika källor. Man har även lagt in sin CMSS-3D funktion i Xmod vilket gör att man kan omvandla MP3-låtar och andra stereosignaler till surroundljud.
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Vi har sedan tidigare sett att båda dessa funktioner kan ge bra resultat i Creatives ljudkort och om man lyckats lika bra med sin externa Xmod finns det garanterat användningsområde för en portabel "ljudrenare". Creative Xmod kommer dyka upp på marknaden under oktober och till ett riktpris på 795 kronor.
January 30, 2004
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Om det fungerar kan jag tänka mig detta. Har mycket mp3-musik. Även nätradio, tv-program o film med mp3.
Köper nog hellre det billigaste xfi för 1000.-
June 28, 2005
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Hoppas inga på den är sajten köpt Creatives halvbogus om att MP3orna blir som CDs och CDs blir DVD-Audio av Crystalizern... det testades utförligt här: http://www.digit-life.com/arti.....part2.html och vad som man köper är mer eller mindre en dynamisk loudnessknapp (särskilt om man lyssnar på okomprimerat, via bra extern DAC till bra förstärkare och högtalare).
"As we can see, Crystalizer does not expand DR of the 16 bit signal, it even reduces it. By default (50%), Crystalizer amplifies the signal so that the two 60 Hz @ -5 dB and 7000 Hz @ -17 dB sines (it's a standard SMPTE-IMD test signal) cause about 1% of distortions (IMD+Noise). The distortions cannot possibly make the sound crystal clear."
Och svaret från Mark Dolson, Director of Audio Research, Creative Advanced Technology Center, Scotts Valley, CA, USA:
"Creative's 24-Bit Crystalizer is best understood as a signal-dependent, dynamic EQ.The source of its intelligence is an analysis front end that continuously calculates dynamically-normalized, separate low-frequency and high-frequency energy flux signals, based on nonlinear processing of the input audio streams.These two flux signals are used to apply proportionally-weighted, transient, low-frequency and high-frequency boosts to the input audio.
In the end, the extent to which the 24-bit Crystalizer achieves its goal (of partially compensating for the limited 16-bit dynamic range of CD audio) is a matter of subjective assessment.
It is certainly possible to find sound examples and/or listeners for which the results are not satisfying. For this reason we implemented this technology in a flexible way. We allow users who listen to very high-quality content to reduce or even to turn off the enhancement should they so desire. Meanwhile, others who listen to lower-quality content, or to specific types of music that 24-bit Crystalizer works well with, can increase the level of enhancement.
Creative's experience to date is that actual listener response has been overwhelmingly positive in the general user market."
Och svaret på detta:
"The original recording sounded much better to me in both cases. Crystalizer heavily equalized the recording, causing an evident trough in medium frequencies. All sharp noises (such as percussions, guitar strings, saxophone's edge of attack) were stressed, often occulting the rest of the recording (automatics failed to detect that singing was more important than the cymbals part in this recording). Perhaps, such audio processing will do good only if you listen to some recordings on small computer speakers, which add their own distortions. Through these distortions you will make out the equalization and a sharper attack of percussions. Turning down Crystalizer produces a positive effect: it results in the reduction of equalization and general volume level, and in higher resistance to overload.
Nevertheless, we should admit that the hardware betterizer Crystalizer is a plus for common users, as well as an equalizer or tone controls. Using these tools they may try to make up for shortcomings of their speakers or headphones. Anyway, you shouldn't hope that MP3 128 Kbit/s will miraculously sound better than the original CD-DA. Whether this technology is justified is up to you to decide, taking into account how it makes your recordings sound.
I doubt that modern popular recordings need additional violation of their dynamic range. Probably you'd better carefully choose the Crystalizer effect until you hear the signs of overload. You must also take into account that Crystalizer increases the volume level by 3-4 dB in digital form. So perhaps all you need is to increase the volume by the same value and avoid distortions in the tonal balance and other problems."
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