Besides the well-known influence on bias noise of the magnetizable particles` size and size distribution, some observations are given dealing with roughness and friction which cause noise from the playback head. This kind of `microphonism` of the head is correlated to tape samples and their surfaces. The reduction of this `microphonism` in the manufacture of the head together with reductions in surface roughness and friction in the manufacture of the tape could lead to further optimization of the signal-to-noise ratio in analog recording. In addition, in all recording fields, noise itself could be reduced.
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