Dct (File Format)

Introduction

A proprietary variable codec audio file format designed for dictation by NCH Software. It has dictation header information and can be encrypted (often required by medical confidentiality laws). A free dct player, Express Scribe Transcription is provided.

List of codecs supported in dct files.

Comments

The above are wave files - even if they have the mp3 codec they will have the ".wav" or ".dct" extension.

Discrete cosine transform

A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. DCTs are important to numerous applications in science and engineering, from lossy compression of audio (e.g. MP3) and images (e.g. JPEG) (where small high-frequency components can be discarded), to spectral methods for the numerical solution of partial differential equations. The use of cosine rather than sine functions is critical for compression, since it turns out (as described below) that fewer cosine functions are needed to approximate a typical signal, whereas for differential equations the cosines express a particular choice of boundary conditions.

In particular, a DCT is a Fourier-related transform similar to the discrete Fourier transform (DFT), but using only real numbers. DCTs are equivalent to DFTs of roughly twice the length, operating on real data with even symmetry (since the Fourier transform of a real and even function is real and even), where in some variants the input and/or output data are shifted by half a sample. There are eight standard DCT variants, of which four are common.

Motorola DCT6412

The Motorola DCT6412 is a dual tuner HDTV DVR by Motorola deployed by the following companies:

In the United States, the DCT6412 is generally owned by the cable company and rented to cable subscribers. Some US cable companies lease the DCT6412 to all of their HDTV customers, regardless of whether they have paid to enable DVR service or not.

Motorola DCT3412

The Motorola DCT3412 is a digital-tuner only version of the Motorola DCT6412 HDTV DVR. It is similar to the 6412 Phase III, except that it is unable to tune in analog channels. It is only used on systems that have analog-digital simulcasting (ADS) active.

The 3412 is about the same width and height as the 6412, but is not as deep (about 11 inches, versus 13 inches on the 6412). On the front it has no SmartCard slot, no A/V input, and no USB port (there is still one USB port on the back). On the back, there are no A/V inputs and no metal cover where the RF Input connector is.

The 3412 can record two SD digital or HDTV channels at once and play back a recorded show at the same time. The 3412 has a 120 GB hard drive giving it an HDTV recording time of 12–20 hours and about 60 to 90 hours of SD digital TV. A similar model 3416 has a 160 GB drive.

The Motorola DCT3080 is similar to the 3412, but has an 80 gigabyte hard drive and no HD circuitry. It can receive and record HD programming, but can only output 480i.

Glossary of chess

This page explains commonly used terms in chess in alphabetical order. Some of these have their own pages, like fork and pin. For a list of unorthodox chess pieces, see Fairy chess piece; for a list of terms specific to chess problems, see Glossary of chess problems; for a list of chess-related games, see Chess variants.

A

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P

[adjective: prophylactic] Prophylactic techniques include the blockade, overprotection, and the mysterious rook move.

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References

Bibliography

File (tool)

A file is a metalworking, woodworking and plastic working tool used to cut fine amounts of material from a work piece. It most commonly refers to the hand tool style, which takes the form of a steel bar with a case hardened surface and a series of sharp, parallel teeth. Most files have a narrow, pointed tang at one end to which a handle can be fitted.

A similar tool is the rasp. This is an older form, with simpler teeth. As they have larger clearance between teeth, these are usually used on softer, non-metallic materials.

Related tools have been developed with abrasive surfaces, such as diamond abrasives or silicon carbide. Because of their similar form and function, these have also been termed 'files'.

History

Early filing or rasping (the distinction is emic, not etic) has prehistoric roots and grew naturally out of the blending of the twin inspirations of cutting with stone cutting tools (such as hand axes) and abrading using natural abrasives, such as well-suited types of stone (for example, sandstone). Relatedly, lapping is also quite ancient, with wood and beach sand offering a natural pair of lap and lapping compound. The Disston authors state, "To abrade, or file, ancient man used sand, grit, coral, bone, fish skin, and gritty woods,—also stone of varying hardness in connection with sand and water."

201 file

A 201 file is set of documents maintained by the US government for members of the United States armed forces. 201 files usually contain documents describing the member's military and civilian education history. A 201 file may also contain personal information such as home of record, and awards documents. Typically, a 201 file contains one or more of the following:

The 201 file is an important document for service members to maintain, as the documents it contains are important for access to benefits such as the VA Loan and the GI Bill.

Copies of the 201 file can also be requested from the National Archives by service members and their families.

The Central Intelligence Agency also uses the term "201 File" to refer to their own personnel records used for analogous purposes.