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Audio processor chips enhance flat-panel TV sound

Lexington, Mass.—STMicroelectronics' TV sound processor chips in the company's STV83xy family, an evolution of the company's STV82xy devices, provide high-end audio algorithms for supporting mainstream flat-panel TVs and U.S., European, and Asian analog broadcast standards.

“With automatic recognition of analog broadcast standards, it has never been so easy to have great sound on flat TV, especially using our audio compensation algorithms,” said Gabriel Guglielmi, general manager of the Home Display Peripherals Division. “This new sound processor family builds on the success of the STV82 processors and leverages ST's relationship with SRS Labs to develop leading-edge sound technology, bringing high-end audio performance to both analog and digital flat-panel TV sets at every level.”



As with the STV82xy devices, these new processors are a single-chip solution that provides all the resources required to detect, decode, and process analog audio transmissions or digital sources with multichannel content and drive a range of audio channels from enhanced stereo up to full 5.1 surround sound.

With a built-in audio delay of up to 100 ms, the STV83xy family compensates for the video processing delay of flat-panel TVs without the need for external memory; the devices support the use of external delay if more than 100 ms is required. The chips' high-end digital signal processor offers compensation for the smaller loudspeakers and less-than-ideal chassis acoustics often found in flat-screen sets as designs become thinner.

The digital outputs of the STV83xy can be connected to a digital audio amplifier, such as the company's STA333 Digital Class D amplifier, to create a fully digital audio processing chain. The chip supports up to five analog inputs, and up to 5.1 analog outputs that can be connected to analog Class A/B or Class D audio amplifiers.

In addition to third party processing and enhancement technologies from Dolby and SRS Labs, the STV83xy includes ST's royalty-free algorithms: ST Widesurround, ST Omnisurround (which are Virtual Dolby Surround and Virtual Dolby Digital compliant), ST Dynamic Bass, and ST Voice. An embedded sample rate converter (SRC) processes data at 48 kHz. Audio processing options —with separate processing for headphone and loudspeaker channels—include Dolby Pro Logic I, Dolby Pro Logic II, SRS WOW, and SRS TruSurround XT for full multichannel environments, in addition to the newly released SRS TruSurround HD, which provides high frequency clarity enhancement.

Enhancement technologies include Smart Volume Control (SVC), 5-band graphic equalizer, a 3-band parametric equalizer, and loudness control on loudspeaker signals. The independent headphone processors include SVC, bass, treble, loudness, ST Dynamic Bass, SRS TruBass and SRS Dialog Clarity. One of the chips' two I2 S (Inter IC Sound) interfaces, each with three inputs, enables Dolby Digital data from a high-definition MPEG decoder, such as the company's ST-D2000 single-chip worldwide iDTV processor, to be processed, allowing certification of the Virtual Dolby Digital function at TV set level. Additionally, the multichannel input allows TV manufacturers to upgrade their SRS TruSurround XT certification for SRS TruSurround XT 5.1 Digital and SRS TruSurround HD 5.1 Digital.

Separate processing channels for loudspeakers and headphones allow the end user to choose either two different sounds (for the picture in picture mode), or to experience high-end sound processing such as Virtualizer (Dolby and SRS Labs) for loudspeakers, and specific settings for headphones.

Click here for the STV83x7 (for A2 and NICAM standards) datasheet, and here for the STV83x8's (BTSC standard). The STV83xy, available in a TQFP100 package, is priced at $5 each in 1k pieces. It can also be supplied in a TQFP80 for users migrating from the STV82xy family.

STMicroelectronics , 1-781-861-2650, www.st.com

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