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Sound mixing system for film sound editing
| Details |
Inventors: Hill, James W.; Finley, Eugene N.;
Assignee:
Primary Examiner: Hayes; Monroe H.
Assistant Examiner:
Attorney, Agent or Firm:
A separately packaged film sound editor mixer is disclosed which includes a plurality of low level audio signal input terminals adapted for connection to outputs from playback heads of a synchronizer. Magnetic tape preamplifiers are included for preamplification of the low level signals. The preamplified signals are connected through slide attenuators and muting switches to inputs of a first summing amplifier. The output from the first summing amplifier is connected to inputs of left and right channel summing amplifiers through a tone control circuit and a master attenuator of the slide type. A selector switch is included in the input for one of said magnetic tape preamplifiers whereby, in one switch position, an output from the synchronizer is supplied to the preamplifier, as mentioned above. In the other switch position, the preamplifier input is connected to another input terminal to the mixer through a variable attenuator, which input terminal is adapted for connection to an audio signal source from an upright editing machine, or the like, for mixing with signals from other playback heads of the synchronizer. Also, left and right channel input terminals are included with are connected through variable attenuators to inputs of said left and right channel summing amplifiers. A stereophonic signal source, such as the output from a stereophonic tape deck, may be supplied to the left and right channel input terminals for mixing with monaural signals from the first summing amplifier. The power supply for the mixer includes a ground lift switch for removal of the power ground prong of the three-prong power plug from the chassis of the mixer to prevent ground loop currents. |
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DETAILED DESCRIPTION AND OBJECTS An object of this invention is the provision of a new and novel sound mixing system for use in sound editing of motion picture film which avoids many of the shortcomings and disadvantages of prior art sound readers employed in sound editing systems.
An object of this invention is the provision of a sound mixing system of the above-mentioned type which physically is small enough to be operated entirely with one hand, without need of visual contact by a familiar operator, and which is small enough to be placed anywhere on the sound editing bench.
An object of this invention is the provision of a sound mixing system of the above-mentioned type which achieves far better signal-to-noise performance than prior art sound readers.
An object of this invention is the provision of a sound editing system of the above-mentioned type which provides for mixing of monaural and stereophonic audio signals whereby effects and music editors can create scratch mixes in the sound cutting room using inputs from a stereophonic signal source such as a stereophonic tape deck.
An object of this invention is the provision of a sound editing system of the above-mentioned type which includes a separate plug-in power supply for supplying d-c operating voltages to systems components, which power supply includes means for disconnecting the system chasis from the a-c power source ground to avoid ground loop currents when associated components are included which are connected to the power source ground.
The above and other objects and advantages are achieved by use of an independently packaged audio signal mixing apparatus having a plurality of input connecting means for receiving low, middle, and high level audio input signals from sound editing equipment such as a sound synchronizer, stereophonic tape deck, upright editing machine, and the like.
Low level audio signals from pick up heads included in a synchronizer are preamplified by separate magnetic tape preamplifiers.
Slide type attenuators, or faders, are included in the output circuits of the preamplifiers for individual level control of the signals
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Audio Signal Processing 
