Digital Identification-signal Generator.

A digital identification-signal generator for the storage and reproduction of AF signals was developed. The sound signals may consist of music, speech or synthesized signals and may be combined for station or circuit identification, interval signals and test or measuring signals. The sound signals are stored in PCM form in digital semiconductor stores and reconverted into analog signals upon reproduction. Compared with analog storage on magnetic tape, as used up to now for the above purposes, digital storage makes possible a considerably better sound quality (less noise, less distortion, no flutter or wow, no print-through). Because storage is provided by electronic semiconductor stores and thus, in contrast to conventional sound carriers (disk, magnetic tape), it contains no mechanically moving components so that neither the equipment nor the sound signal is subject to wear. The equipment does not require maintenance; the reproduction quality of the sound signal is not degraded, even by frequent replaying.