What is the difference between frequency compression and frequency transposition?
For the most part, we are talking about terminology differences: Frequency Transposition is a nontechnical, generic term to describe frequency lowering. Sonovation/AVR used this term in the early 1990s. The term Frequency Transposition was also used by others to describe instruments that used Frequency Shifting (another term that adds to the confusion). In an attempt to separate Sonovation/AVRs technology from the others, we started using the term Frequency Compression. Here are the main differences between Frequency Shifting and Frequency Compression: Frequency shifting is a technical term specifically relating to the use of a mixer (as in electric circuits not the kitchen appliance) to lower the signal by a fixed frequency value. The problem with shifting is that is does not reduce the bandwidth. It only shifts the signal down. This creates very strong distortions when the shifting frequency is greater than the signal frequency. In comparison, Frequency Compression reduces both the f
