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Programmable chips bring audio clarity to HDTVs

Posted: 31 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:audio processors? LCD HDTV designs? HDMI?

 ADAV4601, ADAV4622

Analog Devices Inc. has introduced two audio processors for HDTV sound that provide uninterrupted, high-fidelity audio connectivity from a variety of digital and analog home entertainment sources. The ADAV4601 and ADAV4622 audio processors expand ADI's Advantiv advanced TV solutions portfolio for flat-panel plasma and LCD HDTV designs. With a single ADAV46xx-based audio platform, engineers can support multiple TV designsfrom high-end to low-endwithout costly system redesign, reducing time-to-market by up to several weeks.

Offering unit costs that are comparable with fixed-function audio processors, the fully programmable ADAV46xx family gives OEMs the flexibility to customize their advanced audio subsystems, or to use default settings for fixed-function audio processing. In addition to supporting the latest audio standards used in HDTVs, the new audio processors provide the capability for supporting post-sale software updates and enable TV manufacturers to easily add performance enhancements or remedy TV model hardware and software issues.

"The flat-panel TV market has shifted into high-gear, so manufacturers must deliver advanced audio functions across numerous product lines, price targets and industry standards," said Bill Bucklen, director, advanced TV segment at ADI. "The ADAV46xx family enables audio engineers to deliver lifelike sound that compensates for the space-constrained speakers in today's flat-panel LCD and plasma TVs. At the same time, ADI's new audio processors provide support for important end-user system firmware upgrades that are critical in helping to reduce product returns and minimize costs."

High-fidelity audio ICs
Combined with high-performance, multi-channel, 24bit ADCs, DACs and an integrated multichannel, pulse-width modulator (PWM), the ADAV46xx family delivers all the subsystem functionality required for an advanced TV audio implementation. Designed to work with ADI's latest High-Definition Multimedia Interface (HDMI) receivers and Class-D power stages, the audio processors eliminate annoying pops and clicks that can disrupt audio clarity.

The ADAV46xx also includes an external mute pin, allowing designers to provide pop/click reduction during system start-up, change audio sources seamlessly and deliver the high-quality audio required to match today's HD video.

The enhanced processors provide full support for digital and analog baseband audio, as well as multi-standard analog broadcast demodulation and decoding for worldwide broadcasting standards such as BTSC, EIAJ, A2-Korea, A2-Europe and NICAM. The ADAV4622 includes an integrated broadcast audio processor with an auto-standard-detecting (ASD) processor, which reduces design time and costs over competing offerings that require external SIF circuitry for broadcast standard detection and switching.

The ADAV46xx audio processors provide advanced audio features such as a dedicated TV audio flow that incorporates full matrix switching of any input to any output; automatic volume control for compensating for volume changes during advertisements or when switching channels; dynamic bass, a multiband equalizer; and up to 200ms of stereo delay memory for A/V synchronization.

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