SigmaTel C-Major PC Audio Codecs to Support Microsoft Windows Media Audio 9 Professional

Business Wire, Sept 7, 2004

SAN FRANCISCO -- SigmaTel Inc. (Nasdaq:SGTL), a leader in analog intensive, mixed-signal integrated circuits, today announces its support for Microsoft(R) Windows(R) Media Audio 9 Professional (WMA Pro) within its C-Major(TM) audio codec product line for PCs and digital home entertainment systems.

Supporting 5.1- and 7.1-channel digital audio signals at 24 bit and 96-kHz, WMA Pro provides premium audio fidelity to the PC or digital set-top box. A typical application involves using a single digital or optical cable to stream WMA Pro audio content from a Windows- based PC to the audio/video (A/V) receiver within a home theater system, allowing the listener to enjoy the multi-channel experience through a set of surround sound speakers.

"As a leader in the portable digital audio controller business, SigmaTel has long been a supporter of Windows Media Audio," said Jonathan Usher, director at the Windows Digital Media division at Microsoft Corp. "With this latest support for WMA Pro in its C-Major PC audio codec product line, SigmaTel is offering its customers a proven, high-quality audio solution."

"SigmaTel has long been a proponent in pushing improvements in new audio standards, such as Intel's High Definition Audio (HD Audio) and Microsoft's Universal Audio Architecture (UAA)," said Phil Pompa, vice president of the integrated components group at SigmaTel. "WMA Pro is yet another important technology offering from Microsoft that will help tear down the wall between the personal computer and living room consumer electronics."

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 products in the consumer electronics and computing markets, including portable compressed audio players, such as MP3 players, notebook and desktop PCs, DVD players, 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 424(b)(4) final prospectuses filed September 19, 2003, and February 19, 2004, the Form 10-Qs that were filed on October 29, 2003, April 20, 2004 and July 20, 2004 and the Form 10-K that was filed on February 17, 2004.

C-Major is a trademark and SigmaTel is a registered trademark of SigmaTel. 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.