Newnes Audio and Hi-Fi Engineer's Pocket Book, 3rd Edition

75

Pickup cartridges

There is a variety of ways whereby the motion of the stylus can

be translated into an electrical signal. Most of these are

grouped into the class known as magnetic, because they

produce relative movement between a coil and magnetic field.

They are velocity devices because the magnitude of the

induced signal depends on the velocity of the stylus movement

rather than its amplitude. But as tracing speed increases with

amplitude so does the output signal. However, stylus velocity

also increases with frequency, giving a rising treble response.

This is the opposite of the recording cutter characteristic, but as

that was modifie ...