LarZ wrote: >1) The input doesn't get resampled since there is a direct connection >between optical in and optical out. This is in accordance with the schematic >diagram for my JA30ES, and I would imagine yours would be the same. I'm assuming the 520's in's / out are going through some part oft the DSP on account of A. The Category code been changed to MD on the output B. The output data format being consumer with a professional format input. (this is is "- DA" / monitor mode. Putting a disk in and hitting record the data is passed back out in pro format) With a JE520 in "-AD" monitor mode (no disc in it) It is resamplaing 32Khz & 48Khz inputs to 44.1Khz for it's digital output. Will not output a 96Khz input signal. Also using a 44.1Khz input to the 520, with a Level 1 +/- 50ppm clock accuracy it's outputting 44.1Khz with a Level II +/- 1000ppm clock accuracy, along with adding the MD category code, changing the SCMS status etc.. My thinking is that if the MD deck is changing the clock signal then the signal is been resampled. (could be wrong here). Weather this is going as far as the Atrac is still anyones guess. When in Record pause or recording (with a disc in the deck) The Input is been passed to the output without anything been changed. 96Khz signal is been passed through (output is 96Khz) The clock is that from the input Category code doesn't change to MD SCMS is the same etc.... >2) A pro format would be transmitted via 3-pin XLR connectors. I have yet to >see an AES/EBU format transmitted along an optical medium. You sure about >this? David W. Tamkin wrote: >In what physical format is the AES/EBU signal coming into the 520, Matt? I >thought AES/EBU could be carried only over three-cord XLR cables. Input was Optical.and yes I am quite sure! The digi96/8 i'm using can send & receive the digital signal in several formats, Consumer (what you find in S/P-DIFf connections), Professional (what you find in AES/EBU), Adat (8 channel Adat interface) or Non audio (AC-3 etc). (I may not have worded that quite correctly as it's not "standard" AES/EBU dew to the lack of balanced interconnects, but the data in the signal is in the AES/EBU "pro" format,. it was the easiest way of putting it.....). -------- Following taken from the Behringer DSP8024 user's Manual: 4.2.1 The AES/EBU and S/PDIF standards Essentially, two standards exist for the transfer of digital audio data. Their most important electrical specifica- tions are summarized in Table 4.1. AES/EBU is a professional, balanced connection using XLR connectors. For semiprofessional users, Sony and Philips have opted against balanced connections and use either cinch connectors or optical waveguides. The process which was standardized as IEC 958 and is generally known as S/PDIF (Sony/Philips Digital Interface) became best known for the associated efforts to introduce copy protec- tion, however. Unfortunately, the professional standard was soon watered down, as the design of many units didn't provide enough room for XLR connectors. Instead, stereo jacks, miniature jacks and special adapters for sub-D con- nectors were used. In addition to the electrical differences, the formats also have a slightly different structure. The audio informa- tion occupies the same position in the data stream, making the two formats compatible in principle. The differences between the two standards can be found in the information blocks. Table 4.2 shows a section of the professional format data structure generally used in AES/EBU connections. As can be seen, there are major differences in the significance of the following bits between the two formats. If a device such as a commercially available DAT recorder only has a S/PDIF input, the device will normally only understand that format. Generally, it will switch off when receiving professional-format data. The reason is simple: As the illustrations show, a signal coded in professional format would lead to copy-protection and emphasis errors in a device only capable of processing the consumer format! As was already the case with the connectors, this point is often not immediately obvious. Many units do not switch off, others can process both formats despite having only a single connector type, and still others are simply faulty designs which refuse to work properly even when receiving correct ID data. The ULTRA-DYNE PRO can be equipped with an AES/EBU interface as an option. --------- If you want the pix showing the data structure, the manual is available from www.behringer.de as a PDF. --Matt [EMAIL PROTECTED] ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]
