Level control circuit for light beam recording apparatus

Abstract

This invention is to provided in such an information recording apparatus in which when an exposing locus is formed on a film by irradiating on the film an exposing beam whose width is changed in response to an input audio signal, the average level positions of the exposing locus is controlled in response to the signal level of the input audio signal, a level detector circuit for comparing the input audio signal with a predetermined reference level signal, a continuous circuit for making the compared output from the level detector circuit continuous, a first integrating circuit for integrating the continuous output from the continuous circuit and a second integrating circuit for integrating the integrating outputs from the first integrating circuit and delivering the same as the average level position signals used upon the exposure and recording. According to the present invention, it is possible to effectively remove the sharp inflection point on a waveform of a level detecting signal without causing an over-modulation.

Dependencies are inferred from the claim text.