Transposed Sideband Modulation for Data Transmission

Transposed sideband modulation is a method for frequency multiplex transmission of digital voice band signals. Its significant feature is that no sharp cutoffs are required for the single sideband filters so that amplitude and phase distortions can be kept very low. Since transposed sideband modulation retains the CCITT channel subdivision, it is compatible with existing single sideband voice carrier equipment.