Linear Acoustic at IBC2007

July 13, 2007

Source: Linear Acoustic

Linear Acoustic to Spotlight New AEROMAX-5.1™ 10-Channel Audio Processor and LA-5151 MetaMAX™ Metadata Loudness Processor ― Loudness Problems are Solved in Real Time and Dolby Digital (AC-3) Encoding is Built in

1) AEROMAX-5.1™ 10-Channel TV Audio Processor
At IBC2007, Linear Acoustic is highlighting its new AEROMAX-5.1™ 10-channel TV audio processor, which combines network-proven dynamics processing with surround sound upmixing. This innovative new audio processor features metadata handling and extensive local audio features, plus optional 5.1-channel Dolby Digital® (AC-3) encoding.

AEROMAX-5.1 accepts 5.1-network and two-channel local audio, as well as digital or analog auxiliary stereo audio. A fully processed Lt-Rt or Lo-Ro downmix of the main program audio is continuously available via both digital and analog outputs for legacy two-channel paths. A front-panel headphone connector provides simple local monitoring. Built-in AutoMAX™ processing fixes two-channel audio that is being sent to consumers as wrongly signaled 5.1-channel.

2) Model LA-5151 MetaMAX™ Series Metadata Loudness Processor
Linear Acoustic will also highlight its Model LA-5151 MetaMAX™ series metadata loudness processor, the first metadata-based loudness controller for DTV. The LA-5151 controls loudness completely in the compressed domain, eliminating the need for decoding/re-encoding or destructive PCM processing. 

Until now, solving short-term loudness problems has meant permanently changing an audio soundtrack — simply to fix the impact of one annoyingly loud commercial. Using standardized metadata inserted within the digital broadcast signal just prior to transmission, MetaMAX generates dynamic range control parameters more suited to television broadcasting, and delivers to consumer decoders where it is applied by default. Viewers are then protected automatically from loudness shifts, while the audio quality remains untouched for those who choose to experience the original, wide-dynamic range audio.
 

Also Showing at IBC2007

StreamStacker-HD™ High-Density Audio Distribution System
Also on display is the company's StreamStacker-HD™ high-density audio distribution system, which allows multiple audio channels and associated audio metadata to be kept together in a single, easy-to-manage package compatible with any network capable of carrying AES3 digital audio. Linear Acoustic is now actively licensing software decoding for integration into third-party applications and systems are already on-air in the U.S.

StreamStacker-HD encodes up to 16 channels of PCM audio and metadata, and comprises the company's Model 5173 encoder and the Model LA-5174 decoder. StreamStacker-HD can work automatically in tandem with eight-channel systems such as Dolby E, protecting existing investments in content and equipment while offering a path for expansion.

Up to 16 channels of PCM audio can be input to the LA-5173 encoder as eight AES-format pairs, or through HD or SD-SDI ports. After encoding, the bit stream is formatted into a standard AES-format pair. Since SMPTE 302M and 337M-340M specify the carriage of AES-format signals within MPEG transport streams, the signal can be routed, switched, recorded, and passed over satellite and telco links. Uniquely, the StreamStacker-HD bit stream can be edited on AES frame boundaries, is extremely resilient to errors, and keeps audio and video tightly synchronized via an available built-in compensating SDI delay.

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