Progressive segmented frame

Progressive segmented Frame (PsF, sF, SF) is a scheme designed to acquire, store, modify, and distribute progressive scan video using interlaced equipment and media.

With PsF, a progressive frame is divided into two segments, with the odd lines in one segment and the even lines in the other segment. Technically, the segments are equivalent to interlaced fields, but unlike native interlaced video, there is no motion between the two fields that make up the video frame: both fields represent the same instant in time. This technique allows for a progressive picture to be processed through the same electronic circuitry that is used to store, process and route interlaced video.

The PsF technique is similar to 2:2 pulldown, which is widely used in 50 Hz television systems to broadcast progressive material recorded at 25 frame/s, but is rarely used in 60 Hz systems. The 2:2 pulldown scheme had originally been designed for interlaced displays, so fine vertical details are usually filtered out to minimize interline twitter. PsF has been designed for transporting progressive content and therefore does not employ such filtering.

Thiophosphoryl fluoride

Thiophosphoryl fluoride is an inorganic molecular gas with formula PSF₃ containing phosphorus, sulfur and fluorine. It spontaneously ignites in air and burns with a cool flame. The discoverers were able to have flames around their hands without discomfort, and called it "probably one of the coldest flames known". The gas was discovered in 1888.

It is useless for chemical warfare as it burns immediately and is not toxic enough.

Preparation

Thiophosphoryl fluoride was discovered and named by J. W. Rodger and T. E. Thorpe in 1888.

They prepared it by heating arsenic trifluoride and thiophosphoryl chloride together in a sealed glass tube to 150 °C. Also produced in this reaction was silicon tetrafluoride and phosphorus fluorides. By increasing the PSCl₃ the proportion of PSF₃ was increased. They observed the spontaneous inflammability. They also used this method:

at 170 °C, and also substituting a mixture of red phosphorus and sulfur, and substituting bismuth trifluoride.

Another way to prepare PSF₃ is to add fluoride to PSCl₃ using sodium fluoride in acetonitrile.

Portable Sound Format

The Portable Sound Format (PSF) is a sound file format ripped directly from video games from a variety of game consoles. The format was originally used for Sony PlayStation video games, but has since been adapted to support other systems.

The PSF format was created by Neill Corlett in 2003, who also wrote the Winamp plugin Highly Experimental that plays PSF1 and PSF2 files.

Generally, PSF files contain a number of samples and a sequence player program. This takes far less space than an equivalent streamed format of the same music (WAV, MP3) while still sounding exactly like the original track. Background music stored in PSF files can usually be looped forever, as the sequencer handles its own loop points.

Several PSF subformats also have a miniPSF/PSFlib capability, wherein data used by multiple tracks is stored only once in an accompanying PSFlib file. Further differences are stored in a miniPSF file, which can be zlib compressed to further increasing storage efficiency.