Wave Form Analysis of Variable Width Sound Records
The results of a study of the relation between sensitometric conditions and the harmonic content introduced in the photographic process are described. Sinusoidal wave-forms of very low initial harmonic content were recorded, varying the negative exposure, negative development time, and positive exposure so as to cover a range of negative densities, negative gammas, and print densities. Sets of such records were made at several levels of modulation and several frequencies from 100 to 4000 cycles per second. — The records were analyzed on a recording microdensitometer which automatically recorded the transmission of the sound track. These traces, after being enlarged to the appropriate size in order to determine the harmonic content, were analyzed with a harmonic analyzer. The results show that sensitometric conditions for good quality are much more critical at the higher frequencies and that in general the harmonic content does not increase at those frequencies.
- Print ISSN
- 0097-5834
- Published
- 1933-10
- Content type
- Original Research
- DOI
- 10.5594/J12979