Chapter 2. Audio

You may need to connect to audio devices that have different connector types, different audio data formats, or both. This chapter is designed to help you determine what you need. It discusses


Note: AES3-1992 is also called AES/EBU. See the release notes for your Silicon Graphics server for the latest information about compliance to specific standards.


Onyx2/Origin2000 Graphics BaseIO Board Panel

Figure 2-1 shows one version of the BaseIO (also known as the IO6G) board panel, the Onyx2 system's interface to external devices such as keyboards, mice, SCSI devices, audio devices, ASCII terminals, printers, and modems. This panel is standard in the Onyx2 chassis and is optional in the Origin2000 chassis.

All audio and video is transferred to and from main memory via the board's XIO interface. The DIVO and DIVO-DVC option boards support audio embedded in video; they also support video through the DIVO or DIVO-DVC board synchronized with audio going through the BaseIO board (SMPTE 272M). In each case, the video goes through the DIVO or DIVO-DVC board, but the audio may or may not.


Note: If you disconnect a cable from a peripheral device, you should also disconnect it from the I/O connector on the I/O panel. Doing so helps prevent the system from picking up external electrical noise.

Figure 2-1. BaseIO Assembly (IO6G) Panel

Figure 2-1 BaseIO Assembly (IO6G) Panel

Table 2-1 summarizes the BaseIO connector types and functions.

Table 2-1. BaseIO Panel Connectors

Description

Function

Type

Digital audio output and input (AES3-1992)

Audio output to digital audio device

BNC 75-ohm

Video sync loopthrough (two)

Video sync in/loopthrough

BNC 75-ohm

Single +10 V jack

Power for Silicon Graphics supplied speakers

2.5 mm tip-sleeve speaker power jack

ADAT output and input

24-bit digital eight-channel input; can also be used for consumer-grade two-channel SPDIF (Sony/Philips Digital Interface) digital audio

Optical

Audio line in plugs and out plugs

Analog stereo inputs and outputs, respectively

2.5 mm RCA-type (L & R)

Single-jack audio output

Analog headphone or Silicon Graphics-supplied speakers

3.5 mm tip-ring-sleeve jack

Single-jack audio input

Analog microphone input

3.5 mm tip-ring-sleeve jack

PC-compatible male serial ports

Serial RS-232 or 422 data transfer and receipt

9-Pin sub-D (1-4)

Mouse and keyboard connectors

Mouse and keyboard signals, respectively

6-Pin mini-DIN (1-2); PS/2-compatible

Parallel port

Parallel printer signals to and from external device

36-Pin IEEE 1284-C

FAST-20 SCSI or SCSI-2

Single-ended SCSI

68-Pin SCSI single-ended

Single jacks (two)

Interrupt in and interrupt out, respectively

3.5 mm tip-ring-sleeve jack

Ethernet

Ethernet

RJ-45

Note the following for synchronization:

  • If you are syncing audio and video (that is, the audio on the BaseIO panel with the DIVO or DIVO-DVC board), use a common sync source connected to either BaseIO Video Sync connector and the board's GEN IN connector.

  • If you are not syncing audio to the DIVO or DIVO-DVC board, but are syncing audio to another device, use a BaseIO Video Sync connector.

  • If you use one BaseIO Video Sync connector, you must attach a 75-ohm terminator to the unused Video Sync connector.

  • The DIVO or DIVO-DVC board does not provide sync out. Its GEN IN and GEN OUT connectors are passive loopthrough inputs only; GEN OUT is a loopthrough of GEN IN. Syncing either board or the BaseIO to each other or to external equipment requires an external source of video sync.

External Devices: Digital

This section discusses

BaseIO AES3-1992 Out BNC to AES3-1992 XLR (Digital to Digital)

Figure 2-2 shows cabling between the AES3-1992 out (upper) BNC on the BaseIO panel and an XLR balun connector for digital AES3-1992 output to XLR connections.

The balun (balance-unbalance) converters are passive devices for cabling different connector types while maintaining signal integrity; they are used in male-female pairs. These converters do not change the audio data format.

Figure 2-2. BaseIO AES3-1992 BNC OUT to AES3-1992 XLR

Figure 2-2 BaseIO AES3-1992 BNC OUT to AES3-1992 XLR

Note the following:

  • Cabling is required to connect these baluns to BaseIO panel connectors. Use 75-ohm coax cable, not balanced cable, in accordance with AES-3id-1995.

  • Connect the balun at the balanced (XLR) side of the cable.

Table 2-2 lists some suppliers of this equipment.

Table 2-2. AES3-1992 BNCs to AES3-1992 XLR Equipment Pairs

Manufacturer

Product

Web Site

Energy Transformation Systems

Male: PA-810 (no pad)

Female: PA-811(no pad)

Male: PA-813 (includes 10-dB attenuator)

Female: PA-812 (includes 10-dB attenuator)

www.etslan.com

Graham-Patten Systems

Male: DATS21

Female: DATS10

www.gpsys.com/dats.html

Canare Cable, Inc.

Male: BCJ-XP-TRA

Female: BCJ-XJ-AIOTR

www.canare.com/catalog.html


AES3-1992 XLR to BaseIO AES3-1992 In BNC (Digital to Digital)

Figure 2-3 shows cabling between XLR balun connectors for digital AES3-1992 input from XLR connections to the AES3-1992 in (lower) BNC on the BaseIO panel. The balun (balance-unbalance) converters are passive devices for cabling different connector types while maintaining signal integrity; they are used in male-female pairs. These converters do not change the audio data format.

Figure 2-3. AES3-1992 XLR to BaseIO AES3-1992 In

Figure 2-3 AES3-1992 XLR to BaseIO AES3-1992 In

Coax cabling is required to connect these baluns to BaseIO panel connectors.

See Table 2-2 for suppliers of this equipment.

BaseIO ADAT Optical Out to AES3-1992 XLR (Digital to Digital)

Figure 2-4 shows connections between the optical ADAT out (upper) connector on the Onyx2 BaseIO panel and XLR connectors. This converter supports up to four or up to eight XLR connectors, depending on the equipment. This connection does not change the audio data format (AES3), but does change the subcode (ancillary data), because ADAT and AES3 use different subcode formats.

Figure 2-4. ADAT Out to XLR Converter (AES3-1992)

Figure 2-4 ADAT Out to XLR Converter (AES3-1992)

Table 2-3 lists some suppliers of this equipment.

Table 2-3. ADAT to XLR Format Converters (AES3-1992)

Manufacturer

Product

Web Site

Spectral

Translator Plus and XLR fanout adapter

www.spectralinc.com/products/translator/
translator.htm

Otari Corporation

UFC-24/8

www.otari.com/products/ufc24.htm


AES3-1992 XLR to BaseIO ADAT Optical In (Digital to Digital)

Figure 2-5 shows connections between XLR connectors and the optical ADAT in (lower) connector on the BaseIO panel. This converter supports up to four or up to eight XLR connectors, depending on the equipment. This connection does not change the audio data format (AES3), but does change the subcode (ancillary data), because ADAT and AES3 use different subcode formats.

Figure 2-5. XLR (AES3-1992) to BaseIO ADAT In

Figure 2-5 XLR (AES3-1992) to BaseIO ADAT In

See Table 2-3 for suppliers of this equipment.

External Devices: Analog

This section discusses

BaseIO AES3-1992 Out BNC to XLR (Digital to Analog)

Figure 2-6 shows cabling between the AES3-1992 out (upper) BNC on the BaseIO panel and a digital/analog converter. This connection changes the format of the outgoing data from digital to analog.

Figure 2-6. AES3-1992 BNC Out to Analog XLR

Figure 2-6 AES3-1992 BNC Out to Analog XLR

Table 2-4 lists some suppliers of this equipment.

Table 2-4. AES3-1992 Out BNC to Digital/Analog XLR Converter

Manufacturer

Product

Web Site

Spectral, Inc.

ADDA-2218

www.spectralinc.com/products.htm

Grass Valley Group

M9402-B, M9422-B

www.tektronix.com/Grass_Valley/Products

Sony, Inc.

DABK 1512 (plugs into DAF-1500 8-slot box)

www.sel.sony.com/SEL/bppg/proaudio

Table 2-5 lists some suppliers of distribution amplifiers.

Table 2-5. Distribution Amplifiers

Manufacturer

Product

Web Site

Grass Valley Group

M9131 distribution amplifier
M9131 fanout distribution amplifier

www.tektronix.com/ Grass_Valley/
Products

Sony, Inc.

BKPF-103 (plugs into 14-slot PFV-D100A box)

www.sel.sony.com


XLR to BaseIO Panel AES3-1992 In BNC (Analog to Digital)

Figure 2-7 shows cabling between an analog/digital converter and the AES3-1992 in (lower) BNC on the BaseIO panel. This connection changes the format of the incoming data from analog to digital.

Figure 2-7. Analog XLR to AES3-1992 BNC In

Figure 2-7 Analog XLR to AES3-1992 BNC In

Table 2-6 lists some suppliers of this equipment.

Table 2-6. Analog/Digital XLR Converter to AES3-1992 In BNC

Manufacturer

Product

Web Site

Spectral, Inc.

ADDA-2218

www.spectralinc.com/ products.htm

Grass Valley Group

M9401-B, M9421-B

www.tektronix.com/ Grass_Valley/Products

Sony

DABK 1512 (plugs into DAF-1500 8-slot box)

www.sel.sony.com/bppg/proaudio


BaseIO ADAT Optical Out to XLR (Digital to Analog)

Figure 2-8 shows connections between the ADAT out (upper) optical connector on the BaseIO panel and a digital/analog converter. This connection changes format from digital to analog. The equipment can have up to eight XLRs.

Figure 2-8. ADAT Out to Analog XLR

Figure 2-8 ADAT Out to Analog XLR

Table 2-7 lists some suppliers of this equipment.

Table 2-7. ADAT to D/A for XLR Connections

Manufacturer

Product

Web Site

Mytek Digital

8x20 DAC with ADAT option

www.mytekdigital.com/8x20.htm

Studer

D19 MultiDAC

web.eunet.ch:80/studer/pages/sales002.htm#D19-Series


XLR to BaseIO ADAT Optical In (Analog to Digital)

Figure 2-9 shows connections between an analog/digital converter and the ADAT in (lower) optical connector on the BaseIO panel. This connection changes format from analog to digital. The equipment can have up to eight XLRs.

Figure 2-9. Analog XLR to ADAT In

Figure 2-9 Analog XLR to ADAT In

Table 2-8 lists some suppliers of this equipment.

Table 2-8. ADAT to D/A for XLR Connections

Manufacturer

Product

Web Site

Korg

880A/D (TRS-style input; first two channels are XLR and TRS)

www.korg.net/pages/eng/
eprod/edrs.htm

Studer

D19 MicAD

web.eunet.ch:80/studer/pages/ sales001.htm#D19

Mytek Digital

8x20 DAC with ADAT option

www.mytekdigital.com/8x20.htm


BaseIO Panel ADAT Out to Tip/Ring/Sleeve (Digital to Analog)

Figure 2-10 shows connections between the ADAT out (upper) optical connector on the BaseIO panel and a tip/ring/sleeve (TRS) quarter-inch digital/analog converter. This connection changes format from digital to analog. The equipment can have up to eight connectors.

Figure 2-10. ADAT Out to TRS

Figure 2-10 ADAT Out to TRS

Table 2-9 lists A/D and D/A converters.

Table 2-9. TRS A/D and D/A Converters

Manufacturer

Product

Web Site

Korg

880D/A

www.korg.net /pages/eng/eprod/edrs.htm

Korg

880A/D

www.korg.net /pages/eng/eprod/edrs.htm


TRS to BaseIO Panel ADAT In (Analog to Digital)

Figure 2-11 shows connections between the ADAT in (lower) optical connector on the BaseIO panel and a tip/ring/sleeve (TRS) quarter-inch digital/analog converter. This connection changes format from analog to digital. The equipment can have up to eight connectors.

Figure 2-11. TRS to ADAT Out

Figure 2-11 TRS to ADAT Out

See Table 2-9 for a supplier.

Third-Party Suppliers

Table 2-10 summarizes information for audio equipment manufacturers listed in this chapter.

Table 2-10. Audio Equipment Manufacturer Contact Information

Category

Information

Manufacturer Address

Telephone
Fax
Web site

Canare Cable, Inc.
531 5th Street, Unit A
San Fernando, CA 91340 USA
818-365-2446
818-365-0479
www.canare.com

Manufacturer
Address

Telephone
Fax
Web site

Energy Transformation Systems
1394 Willow Rd.
Menlo Park, CA 94025-1598 USA
650-324-4949; 800-752-8208
650-324-1608
www.etslan.com

Manufacturer Address

Telephone
Fax
Web site

Graham-Patten Systems, Inc.
P.O. Box 1960
Grass Valley, CA 95945 USA
530-273-8412; 800-422-6662
530-273-7458
www.gpsys.com

Manufacturer
Address

Telephone
Fax
Web site

Grass Valley Group (a Tektronix Company)
5161 Lankershim Blvd., Suite 100
North Hollywood, CA 91601 USA
818-760-1699, 800-547-8949
818-760-2197
www.tek.com/VND/Products/Grass_Valley/

Manufacturer Address

Telephone
Fax
Web site

Korg USA, Inc.
316 South Service Road
Melville, NY 11747-3201 USA
516-333-9100
516-333-9108
www.korg.com

Manufacturer Address

Telephone
Fax
Web site

Mytek Digital, Inc.
PO Box 1023
New York City NY 10276 USA
212-274-9191
212-686-4948
www.mytekdigital.com

Manufacturer Address

Telephone
Fax
Web site

Otari Corporation
378 Vintage Park Drive
Foster City, CA 94404 USA
650-341-5900
650-341-7200
www.otari.com

Manufacturer
Address

Telephone
Web site

Sony Professional Audio
1 Sony Drive
Park Ridge NJ 07656 USA
800-222-7669
www.sel.sony.com

Manufacturer
Address

Telephone
Fax
Web site

Spectral, Incorporated
18800 142nd Ave. NE
Woodinville, WA 98072 USA
425-487-2931
425-487-3431
www.spectralinc.com

Manufacturer Address


Telephone
Fax
Web site

Studer Professional Audio AG
Althardstrasse 30
CH-8105 Regensdorf
Switzerland
+41-1-870-75-11
+41-1-840-47-37
www.studer.ch