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TEMPLIN
August
Fig. 18 shows the frequency-response characteristic for the highfrequency equalization . For 35-mm recording this consists of an equalizer having response complementary to the resonance characteristic of the light valve, thereby making the lightvalve modulation correspond to that of the signal over the entire useful frequency range. This characteristic introduces a loss of 9 decibels at the light-valve resonant frequency of 9000 cycles. For 16-mm recording this equalizer is switched to provide a low-pass filter cutting out slightly above 5000
20
too
5000 IOOOO 20000
200 500 1000 2000 FREQUENCY IN CYCLES PER SECOND
Fig. 18 — Light-valve equalizer and low-pass filter characteristics.
cycles in order to suppress those frequency components beyond the 16-mm useful range.
OVER-ALL SYSTEM CHARACTERISTICS
Typical over-all-electrical-response characteristics for recording on 35-mm film are shown in Fig. 19. For dialog recording the low frequencies are attenuated and the mid-range boosted to obain the most realistic dialog quality. The light-valve equalizer is used to complement the effect of light-valve resonance. For music the low-frequency and mid-frequency equalization are removed. The lightvalve equalizer is left in the circuit to provide an over-all system response (up to the film) which is flat over the useful frequency range, thereby obtaining the maximum fidelity for the recorded music.
In Fig. 20 a typical over-all electrical response for 16-mm recording is shown. As previously described, for dialog recording the 1<>\\