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TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
941 PM HST WED JAN 14 2009
TO - CIVIL DEFENSE IN THE STATE OF HAWAII
SUBJECT - TSUNAMI INFORMATION
THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0927 PM HST 14 JAN 2009
COORDINATES - 22.6 SOUTH 170.5 EAST
LOCATION - SOUTHEAST OF LOYALTY ISLANDS
MAGNITUDE - 6.8 MOMENT
EVALUATION
BASED ON ALL AVAILABLE DATA A DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS
NOT EXPECTED AND THERE IS NO TSUNAMI THREAT TO HAWAII. REPEAT. A
DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS NOT EXPECTED AND THERE IS NO
TSUNAMI THREAT TO HAWAII.
THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.
The change in input voltage required to produce a zero output voltage when no signal is applied to an amplifier.
DC Offset
DC offset is an imbalance that sometimes occurs in A/D converters (see WFTD archive "A/D Converter"). When working with audio it is desirable to have only the audio program material passed through the signal path. Almost by definition audio, being a periodic waveform, is an AC (Alternating Current) signal. DC (direct current) is of the non alternating or periodic variety and thus has no constructive purpose as part of an audio signal. It is merely a constant voltage that is present which can eat up headroom (see WFTD archive "Headroom") and cause clicks and pops during editing.
DC Offset
DC offset is a measure of the unbalance of the mixer. For an ideal mixer, the DC offset is zero. DC offset defines the IF
voltage output when the mixer is used as a phase detector and only the LO signal is applied, the RF-port is terminated
in 50 ohms.