Enhanced Single Sideband (ESSB)May 23rd Fact-of-the-Day
Most existing single-sideband transmitters and receivers filter nearly all audio-frequency components above some rather low frequency, such as 2 kHz, 2.4 kHz or 2.7 kHz. They also filter most low-frequency audio components below some rather high frequency such as 400 Hz, 300 Hz or 200 Hz. The result, especially in the narrowest-bandwidth cases, is poor quality audio that might best be described as sounding somewhat like 'Donald Duck.' There are exceptions. Some equipment models have wider bandwidths, can be modified relatively easily to have wider bandwidths, or can be enhanced by external processing to have wider bandwidths. SSB transmissions with high-frequency cutoffs at or above 3 kHz and with improved bass response have come to be known as Enhanced Single Sideband (also known as Expanded Single Sideband) transmissions. Traditional bandwidths are so narrow that even slightly enhanced transmissions sound dramatically better and are creating lots of interest in ESSB. ©2005 Martek, International. All rights reserved.
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