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发表于 2006-4-6 10:41:57
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CD-Pro2M 的金属模块和机械结构比过去任何一代都更坚固、更畅顺和更低的机械噪声。
CD-Pro2M完全兼容并完整阅读CD-R 和CD-RW讯息。
新的CD10 (SAA7324 M2) 伺服解碼器改善了playability 和可靠性。
可作水平或垂直使用。
能适应更大的温差。
From CDM12 Industrial to CD-Pro2M ...
The CDM12 Industrial was actually the first generation of professional modules to include a heavy die-cast metal frame. It rapidly met a big success in the audio/video industry.
Indeed, the CDM12 Industrial module had a very successful life, particularly in two specialized markets : in the high-end audio market, because of its excellent ability to retrieve digital audio data and because its very good sound quality; in the jukebox market too, because of its robustness and reliability.
The CD-Pro and CD-Pro2 correspond to the next generations in terms of electronics. They are of course pin-to-pin compatible with the CDM12 Industrial. The main difference lies in the type of decoding device which is used in the application : the CDM12 Industrial (Premium 6000) includes the decoding chip SAA7345 (CD6) and the digital servo chip OQ8868 (DSICS). They are both replaced by the single chip SAA7372 (CD7) in the CD-Pro application (Premium 7000) and by the SAA7324 (CD10) in the CD-Pro2 application (Premium10501). The CD7 and CD10 show better performances, especially thanks to their improved error correction systems. Experience has also underlined that CD7 and CD10 are less sensitive to ESD.
Other changes brought to the CD-Pro and CD-Pro2 modules are the modification of the HF front end filter for improved playability with out-of-specification discs, or the implementation of a single gear ratio for the sledge movement instead of the previous 3/1 ratio, in order to bring stable sledge movements.
Then comes the recent CD-Pro2M. Actually, this module is more an upgrade of the CD-Pro2 than a new design in this range of products.
The main modification is the replacement of the laser unit, which has resulted in changing the flex assembly and the mounting frame as well. Of course, the new light pen can still read CD-DA, CD-R and CD-RW recorded audio discs.
The TDA1305 D/A Converter, which was used with all previous modules, has been replaced in the CD-Pro2M by a new generation 24-bit 192kHz DAC : the AK4384 chip from AKM.
The last modification is the improvement of the CD-Pro2M's firmware as regard to playability : the CD-Pro2M will play back standard CD-DA discs with an excellent playability, but it will read copy-protected discs as well, whatever the protection system which has been implemented.
Still, the CD-Pro2M remains 100% compatible, electrically and mechanically, with its predecessors (CD-Pro2, CD-Pro and CDM12 Industrial). In other words, one should be able to replace a CDM12 Industrial module by a CD-Pro2M in its existing application without any problem.
Grounding strategy has however changed since the CDM12 Industrial. The analogue and digital grounds were connected internally in the CDM12 Industrial Module. They are not connected anymore in its successors for obvious sound quality improvements. In order to optimize the performances of a CD application based on the CD-Pro, CD-Pro2 or CD-Pro2M modules, both grounds have consequently to be connected on the user control board, in a strategic middle ground point.
Finally, all these modules are based on the standard DSA interface, and the same user software can consequently be used with any of them.
For more information, you can download the application note ANVAU12540401 which provides several other tips to improve the performances of a CD-Pro2M based application (see the download section).
http://www.daisy-laser.com/produ ... DPro2/technotes.htm
CD-Pro2M
New high-end standard
for the audio industry
Using the CD-Pro2M module, you will get a high-performance CD-engine, which is designed to deliver an extremely good playability and very low mechanical playing noise.
The CD-Pro2M is an improved version of the CD-Pro2 module, which has been widely used in the high-end audio industry, like its predecessor, the CD-Pro module.
Compared to the CD-Pro module (VAU1252), the CD-Pro2M (VAU1254/31) brings many improvements, like the capability to read CD-RW discs. Its playability has also been improved thanks to the recent CD10 servo-decoder, and a new active filter switching for start-up and play. Besides, the newly developed CD-Pro2M's firmware allows playback of most of the current copy-protected discs.
The CD-Pro 2M module remains fully compatible with its predecessors, and it can directly replace the CD-Pro or CD-Pro2 in your existing application. Indeed, it has the same dimensions and fixation points, as well as the same electrical connections as these modules. Last but not least, all these modules are based on the same standard DSA protocol for external communication, which means they are also software compatible.
Complete, assembled plug-and-play unit combining the high-performance Premium 10502 system with professional VAM1254/21 CD mechanism
Heavy die-cast metal frame for improved performance and stability : robust and reliable design for industrial and professional applications
Same dimensions and fixation as CD-Pro (VAU1252) and CD-Pro2 (VAU1254)
New solid turntable cone (removable)
Compliant with CD-DA (Red Book IEC908), CD-R and CD-RW discs
Can read finalized and non-finalized audio CD-R and CD-RW discs
New CD10 (SAA7324 M2) servo-decoder for improved playability and reliability
Smart Disc Acceptance Algorithm (SDAA) to go beyond Red Book specifications
New active filter switching for start-up and playback
Single and double speed playback to accommodate high-speed recording units
Very fast 99 tracks direct access with minimum successive approximation
Easy control with the standard high-level DSA communication protocol
CD10 internal registers accessible via DSA for low-level customization
Backward compatible with CD-Pro (VAU1252) and CD-Pro2 (VAU1254) : same electrical connections and same communication interface
I2S audio interface for external high-performance DAC or MPEG functions, IEC958 digital output (EBU), analogue audio output (DAC on board)
CFLG and V4 pin for BLER measurement and subcode information
Applicable in horizontal and specified vertical position
Magnet clamping device available
New cover of ESD protective material
Wide temperature range
Increased lifetime
Prepared for a a variety of approbation/safety standards |
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