Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book is a fraud.

Written by academics and department heads who do not understand digital circuitry and have little or no understanding of the physics of sound, it serves only as a history and an ancient one at that. If you are looking for an understanding of the modern digital means of mechanizing such things as compression and filtering, or the technical definition of such terms as 'headroom' or even a description of the protocol used for down loading data into the hearing aid, look somewhere else. Even the 'programmable' in the title is a misnomer. They speak only of data download and never a mention of the use of software algorithms in the processing of sound.