Abstract: Apparatuses and methods are provided for squaring, positioning, and leveling a door frame. The apparatus comprises a generally rectangular body, at least two magnets, and at least one leveling device. The method generally comprises positioning the apparatus of the invention in the center of where a doorway will be placed, contacting the vertical sides of the door frame with the apparatus such that each of the magnets on the apparatus is in magnetic contact with a vertical side of the door frame, and using the apparatus to correctly square, level, and set the door frame.

Abstract: Apparatuses and methods are provided for squaring, positioning, and leveling a door frame. The apparatus comprises a generally rectangular body, at least two magnets, and at least one leveling device. The method generally comprises positioning the apparatus of the invention in the center of where a doorway will be placed, contacting the vertical sides of the door frame with the apparatus such that each of the magnets on the apparatus is in magnetic contact with a vertical side of the door frame, and using the apparatus to correctly square, level, and set the door frame.

Abstract: A system is provided for maintaining an edit decision list for an audio/video reproducer so as to maintain synchronization across discontinuous position references, such as timecode. Discontinuities are detected, measured and the edit decision list maintained with one pass in real time. The system may be implemented into separate nodes of an asynchronous network. The system generally operates by first receiving a timecode. A discontinuity is detected within the timecode and the edit decision list is searched for a corresponding timecode discontinuity. If a corresponding timecode discontinuity is not found in the edit decision list, the edit decision list is maintained by creating and adding a timecode corresponding to the detected timecode discontinuity. Dropouts and errors in the timecode are detected and corrected and a sequential timecode is generated.

Abstract: Extra high quality or ultralong digital audio channels with an aggregate data bit rate that exceeds the maximum data bit rate for a digital storage medium, such as a CD, laser disk or digital audio tape, are recorded on the audio medium. The recording is accomplished by compressing the data bit rates of the multi-channel input signals so that their aggregate data bit rate after compression does not exceed the maximum for the storage medium, multiplexing the compressed audio signals, encoding the multiplexed signal into a predetermined format, and recording the encoded signal on the storage medium. With the storage medium configured to store audio samples having a predetermined number of bits per sample, the compressed audio signals are multiplexed into data groups having the same number of bits, thereby emulating a normal input to the storage medium, even when this involves dividing various input samples among different data groups.

Abstract: A digital sound system for motion picture films employs a digital time code on the film to trigger the transfer of sound data from a digital audio store to a FIFO memory. The digital audio data is read out from the FIFO memory and played back in the theater at a constant rate, with any jumps in the digital time code handled by making a corresponding jump within the digital audio store but not in the FIFO memory. Readout from the FIFO memory and clocking of the digital-to-analog converters (DACs) used for theater playback is synchronized to the AC mains that powers the theater projector, and thus allows for an uninterrupted audio playback even if time code entries on the film are obliterated. The FIFO memory need only have enough capacity to accommodate the maximum audio store access time, and can be quite small.