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SUNNYVALE, CA, December 8, 2009 – Applied Signal Technology, Inc. (NASDAQ: APSG) will host a conference call to discuss its financial results for the fourth quarter of its fiscal year 2009 on Thursday December 17, 2009 at 5:00PM Eastern Time. The Company’s prepared remarks will be followed by a question and answer session.

Via telephone, the dial-in number is 877-407-8031 for domestic callers or 201-689-8031 for international callers; no password is required. The conference call will also be Web cast live (listen-only mode) at the following Web sites: http://www.appsig.com and http://www.InvestorCalendar.com.

The press release announcing the Company’s results will be distributed over a national wire service prior to the conference call. The press release will also be posted at the Company’s Web site: http://www.appsig.com.

Replay of the teleconference call will be available until January 17, 2010 / 11:59PM Pacific Time via telephone by calling 877-660-6853 (International 201-612-7415). Replay pass codes are required: account number 286 and conference ID number 339072.

Replay of the webcast will be available until April 14, 2010 at: http://www.InvestorCalendar.com.

Applied Signal Technology, Inc. provides advanced digital signal processing products, systems, and services in support of intelligence, surveillance, and reconnaissance for global security. For further information about Applied Signal Technology’s products and services, visit our website at www.appsig.com.