Background control

摘要

Just as digital signal processing (DSP) becomes more common in transceivers, DSP loudspeakers too are being found in more and more shacks. They offer the owners of older or less expensive equipment the ability to listen with significantly reduced levels of interference, be that background noise, static crashes or heterodyne. The two models reviewed here are the latest offerings from British company bhi and American company SGC. They are similar to models that have been reviewed before in RadCom, but each has been updated and now includes additional facilities. They are similar to one another in many respects: both are about the same size; both rely heavily on digital electronics to reduce noise and heterodynes; both contain audio amplifiers; and they are similar in price.