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Linear Acoustic LA-5448 AC-3 Frame Synchronizer/Rate Shaper User Guide

vii

List of Figures

1-1

LA-5448 Frame Synchronizer/Rate Shaper Block Diagram ........................................................6

2-1

Rear Panel ...........................................................................................................................................10

3-1

LA-5448 processing three individual AC-3 streams, rate shaping disabled ..............................13

3-2

LA-5448 processing three separate streams, rate shaping enabled. ...........................................14

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Summary of Contents for LA-5448

Page 1: ...Model LA 5448 AC 3 Frame Synchronizer and Rate Shaper User s Guide...

Page 2: ......

Page 3: ...LA 5448 AC 3 Frame Synchronizer and Rate Shaper User Guide Release Date February 2006 Software Version 01 00 21 and later Linear Acoustic Inc Phone 888 292 3117 FAX 717 735 3612 email www LinearAcoust...

Page 4: ...TURN ARE NOT COV ERED BY THIS WARRANTY PLEASE SAVE THE SHIPPING CARTON AND ALL PACKING MATERIALS FAIL URE TO RETURN UNIT IN ORIGINAL SHIPPING CARTON AND PACKING MATERIALS WILL RESULT IN A CHARGE FOR N...

Page 5: ...ction 9 2 2 Installation 9 2 3 Rear Panel 10 2 3 1 Connection Ports 10 2 4 Quick Setup Notes 11 Chapter 3 Applications 13 3 1 AC 3 Dolby Digital Notes 15 3 1 1 Output Mode 15 3 1 2 Multiplexer Timing...

Page 6: ...Linear Acoustic LA 5448 AC 3 Frame Synchronizer Rate Shaper User Guide vi 5 1 3 Unit Produces 448 kbps Output but it is Silent 21 Chapter 6 Specifications 23...

Page 7: ...r User Guide vii List of Figures 1 1 LA 5448 Frame Synchronizer Rate Shaper Block Diagram 6 2 1 Rear Panel 10 3 1 LA 5448 processing three individual AC 3 streams rate shaping disabled 13 3 2 LA 5448...

Page 8: ...lowing features High density frame synchronization of AC 3 bitstreams Silent frame mode replaces errored or missing AC 3 frames with known good versions Rate shape mode allows output data rate to be f...

Page 9: ...rd relay bypass are provided for trou ble free operation 1 3 Future Updates Software updates may become available in the future to add additional features and performance Updates will utilize the seri...

Page 10: ...h the unit and drop it in the mail This will enable us to contact you if there are any software or docu mentation issues Also we are very interested in your feedback This unit was de signed based on f...

Page 11: ...Linear Acoustic LA 5448 AC 3 Frame Synchronizer Rate Shaper User Guide Introduction 8...

Page 12: ...ent marker This manual Warranty information Please fill out and return the warranty card to Linear Acoustic to ensure your software and documentation are kept up to date 2 2 Installation StreamStacker...

Page 13: ...olarity and type i e held or momentary are adjustable via the front panel user interface FUTURE Main Inputs PGM 1 PGM 3 Connect the AC 3 signals that are to be pro cessed to these connectors During po...

Page 14: ...have been made to the rear panel Connect a locally referenced 48kHz AC 3 signal data rate or other parameters do not matter or an AES reference to the REF PGM4 input Verify that the front panel indic...

Page 15: ...Linear Acoustic LA 5448 AC 3 Frame Synchronizer Rate Shaper User Guide Connections 12...

Page 16: ...e AC 3 streams no rate shaping Frame synchronizer plus rate shaping for multiple AC 3 streams Figure 3 1 LA 5448 processing three individual AC 3 streams rate shaping disabled Figure 3 1 above shows t...

Page 17: ...as being rate shaped to a constant 448 kbps output data rate Also shown is a crash switch between two AC 3 sources that will be cleaned up and kept at a constant data rate by the LA 5448 This is usefu...

Page 18: ...selec tion is chosen as long as the LA 5448 and the encoder match The default for the LA 5448 is Pro 32 the default for most known professional equipment that generates or passes AC 3 The result of mi...

Page 19: ...Linear Acoustic LA 5448 AC 3 Frame Synchronizer Rate Shaper User Guide Applications 16...

Page 20: ...menu structure for the LA5124 All up down access is by the up down front panel buttons all left right access is by the left right Prev Next front panel buttons and parameter changes where applicable a...

Page 21: ...rm w a re V e rs io n 5 4 4 8 0 0 2 5 D e v ic e O p tio n s N o n e P G M 1 C R C e rro rs 0 P G M 2 C R C e rro rs 0 P G M 3 C R C e rro rs 0 I O D o w n T o V ie w S y s te m D o w n T o V ie w P G...

Page 22: ...to the LA 5448 The main status LEDs on the front panel give the first indication of trouble when illuminated red while further details about the error con dition can be found under this menu Currently...

Page 23: ...am are not suitable for direct conversion back to analog As the interpretation of this bit varies by manufacturer we have made it adjustable to match any situation Silent frame mode is enabled by defa...

Page 24: ...typical AES signal are tagged with their identities One is in the AES header itself unreliable one is before the actual data called the IEC header and one is in the data itself in this case inside the...

Page 25: ...Linear Acoustic LA 5448 AC 3 Frame Synchronizer Rate Shaper User Guide Troubleshooting 22...

Page 26: ...TE 276M internally terminated Program 4 Ref Input 48 kHz AES input PCM or AC 3 can be used as a fourth pro cessing channel 75 Ohm BNC female connector per AES 3ID 1995 SMPTE 276M internally terminated...

Page 27: ...45 u 48 3 u 61 cm Net Weight 6 lb 12 6 kg approx Shipping Weight 8 lb 15 75 kg approx Power Requirements 115 220 VAC auto ranging 50 60 Hz 2 supplies for redundancy Power Consumption 35 W total maximu...

Page 28: ...RS 485 422 232 Input Port Pinout Status GPI O Port 9 pin female D connector TTL compatible levels Table 6 6 Status GPI O Port Pinout Pin Connection 1 Shield 2 TX A asynchronous data out 3 RX B asynch...

Page 29: ...chronizer Rate Shaper User Guide Specifications 26 Ethernet Port The Ethernet port is a standard RJ 45 female connector that supports 10 or 100BASE T This connector is currently not active but will be...

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