A discriminator transformer is a type of transformer that is specifically designed to separate the audio frequency signals from a radio signal. However, there are several synonyms that can be used to refer to this device depending on the context. Some synonyms include ratio detector, amplitude discriminator, and Foster-Seeley discriminator. While these terms may not be interchangeable in every situation, they all refer to a device that performs a similar function to separate out the desired signal from the carrier wave. Regardless of the term used, a discriminator transformer is an important component in radio technology and plays a crucial role in ensuring clear and accurate audio signal reception.