Abstract
The paper reviews the present status of speech recoding (frequency transposition) devices and concludes that convincing evidence for the superiority of recoding devices over, for example, selective amplification, does not yet exist. A number of fundamental questions requiring answers are then outlined, upon which the design of some ‘ideal’ recoding device appears to be contingent. Some interim design principles are, however, proposed and a description is given of a recoding device designed with these principles in mind. Finally, some initial, encouraging results with the device are reported, and various questions relating to the utility of the device, requiring further investigation, are indicated.