Maintaining consistent, error-free AC-3 bitstreams is critical for high quality audio transmission. Bitstreams delivered from sources outside of the local plant must be synchronized to local reference, must be free of errors and must be of a consistent data rate to prevent multiplexer issues. Decoding and re-encoding AC-3 is expensive, degrades audio quality, and is therefore not an option.

The Linear Acoustic Model LA-5448 Frame Synchronizer and Rate Shaper satisfies these requirements and more, all without re-coding, and can process up to four separate AC-3 streams in a single rack unit. The Model LA-5448 is ideal for applications where AC-3 streams are delivered from external sources and must be multiplexed into a single transport stream.  This requires all streams to be locked to local reference, but also to be free of errors and most importantly kept at a consistent data rate.  As there is no way to guarantee a fixed data rate from an external source, it must be handled locally.  The unit can also be used in situations such as commercial insertions where content of varying data rates needs to be combined into a single consistent output stream.  The Model LA-5448 can be located after a standard routing switcher able to pass AC-3, and regardless of what stream is selected, the result will be consistent and error free.

FEATURES

• Processes up to four separate AC-3 streams
• Locks streams to local plant reference
• Frame repeat and silent frame replace correct or conceal corrupted input frames
• Rate shaping allows output data rate to be fixed at a single constant value, regardless of input
• Allows for glitch-free asynchronous AC-3 switching: ideal for commercial insertion applications
• Dual redundant power supplies and relay bypass for mission critical applications

Spec Sheet
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