New SigmaTel Audio CODECs Enable Systems to Be Compliant with Microsoft Vista Premium Logo Program; 4-Channel CODECs Enable Exceptional Stereo Audio Simultaneous with Another Stereo Stream Such as VoIP

SEATTLE—(BUSINESS WIRE)—May 22, 2006— SigmaTel, Inc. (NASDAQ: SGTL), a leader in mixed-signal multimedia semiconductors, announced today the immediate availability of a new family of 4-channel HD Audio CODECs. These high-performance devices (103dB DAC SNR and 90dB ADC SNR) continue SigmaTel's audio fidelity leadership by fully supporting the upcoming Microsoft Vista premium logo program which requires 4-channel CODECs for two separate capture and render scenarios.

Additionally, a direct on-chip interface allows notebook manufacturers to integrate up to four digital microphones within the LCD bezel to significantly improve voice input quality of Voice over IP (VoIP), instant messaging, and speech recognition applications. Digital microphones eliminate expensive shielded cables and pre-amps allowing more cost effective placement in the LCD bezel, away from notebook noise sources such as key clicks, hard drives, and fans.

"These highly integrated CODECs allow developers to immediately optimize the interactive consumer experience with superior audio and voice capabilities," said Steve Beatty, senior vice president of SigmaTel's Integrated Components Group. "Meeting Premium Logo is a challenge for many in the PC industry. SigmaTel provides the superior technical services and CODEC solutions to meet this challenge."

SigmaTel introduced the first PC Audio CODECs with support for digital microphones in 2005. With the introduction of this family of 4-channel CODECs, SigmaTel's offering now includes a broad array of HD Audio CODECs with digital microphone support that includes 2-channel, 4-channel, 8-channel, and 10-channel codec families.

Developers can select the STAC9204/05 series without modem support or the STAC9254/55 series that enables a two-chip audio and modem implementation. SigmaTel's superior service and software support (including support for Dolby(R) technologies and Intel Audio Studio(TM) from Sonic Focus) enable rapid customization and reduced time to market.

Key Technical Data

-- STAC9204: Two stereo DACs + Two Stereo ADCs HD Audio CODEC

-- STAC9205: Two stereo DACs + Two Stereo ADCs HD Audio CODEC with Quad-Digital Microphone Interface

-- STAC9254: Two stereo DACs + Two Stereo ADCs HD Audio CODEC with Modem Support

-- STAC9255: Two stereo DACs + Two Stereo ADCs HD Audio CODEC with Modem Support and Quad-Digital Microphone Interface

-- 103dB DAC SNR

-- 90dB ADC SNR

-- 24-bit sample resolution with up to 192kHz sample rate

-- Direct interface to up to four digital microphones (STAC9205/9255)

-- Environmental 48-pin LQFP package

-- Supports advanced chipsets with flexible 1.5V to 3.3V signaling

-- +3.3V to +5V analog power supply options

-- Detailed Technical Information available at:

Windows Vista, expected to be released in Q4 2006, is Microsoft's latest operating system that increases the audio performance standards for the personal computer market.

About SigmaTel:

SigmaTel, Inc. a fabless semiconductor company headquartered in Austin, Texas, designs, develops, and markets proprietary, analog intensive, mixed-signal ICs for a variety of digital multimedia products in the consumer electronics and computing markets, including portable compressed audio players, such as MP3 players, notebook and desktop PCs, digital video cameras, multi-function peripheral products, digital televisions, and set-top boxes. SigmaTel provides complete, system-level solutions that include highly-integrated ICs, customizable firmware and software, software development tools, reference designs, and applications support. The Company's focus is on providing system-level solutions that enable customers to rapidly introduce and offer electronic products that are small, light-weight, power-efficient, reliable, and cost-effective. SigmaTel is ISO 9001:2000 certified and is committed to providing customers with high performance, quality products along with superior customer service.

Cautionary Language:

This press release contains forward-looking statements based on current SigmaTel expectations. The words "expect," "will," "should," "would," "anticipate," "project," "outlook," "believe," "intend," and similar phrases as they relate to SigmaTel or future events are intended to identify such forward-looking statements. These forward-looking statements reflect the current views and assumptions of SigmaTel, but are subject to various risks and uncertainties that could cause actual results to differ materially from expectations. A number of important factors could cause actual results to differ materially from those in the forward-looking statements, and there will be events in the future that SigmaTel is not able to accurately predict or control. For a discussion of factors that could impact SigmaTel's financial results and cause actual results to differ materially from those in the forward-looking statements, please refer to recent SigmaTel filings with the SEC, particularly the Form 10-K that was filed on February 24, 2006.

SigmaTel is a registered trademark of SigmaTel, Inc. All other products and brand names as they appear in this release are trademarks or registered trademarks of their respective holders. All specifications may be changed without notice.

SigmaTel, Inc., Austin
Debbie Laudermilk, 512-381-3931

Email Contact
Martha Aviles, 512-744-9968

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