1. A working surface of a mechanical part having reduced friction, on which at least two zones are allocated, said working surface comprising:
at least a lubricant repelling zone, and
at least a lubricant attracting zone interposed in said lubricant repelling zone.
2. A working surface of a mechanical part as in claim 1 and wherein lubricant attraction and repellence are relative terms.
3. A working surface of a mechanical part having reduced friction as in claim 1 and wherein said lubricant repelling zone is a plastic coat and said lubricant attractive zone is a coat-less zone.
4. A lapping method for conditioning a working surface of a mechanical part for having reduced friction, wherein an abrasive grit used for said lapping is harder than the surface of said working surface, and much harder than the surface of said lapper, and wherein said abrasive grit is not too brittle, permitting the rounding of the particles of said grit upon usage.
5. A lapping method for conditioning a working surface of a mechanical part for having reduced friction as in claim 4, and wherein said lapper is coated by a hard plastic coat.
6. A process for mechanically transforming a working surface of a mechanical part for reducing friction, comprising the steps of:
mechanically processing said working surface;
providing micro-relief to said working surface;
lapping said working surface using abrasive grit harder than said working surface but not too brittle to facilitate rounding of said grit particles.
7. A method for processing a working surface of a mechanical part for reducing friction, comprising the steps of:
coating said working surface using a plastic coat having reduced attraction to a lubricant;
removing portions of said coat to expose zone with more attraction to said lubricant.
8. A method for processing a working surface of a mechanical part for reducing friction, as in claim 7 and wherein said coat is prepared by placing a perforated plastic sheet on said working surface.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for transcoding a bit stream encoded according to a mixed-excitation linear predictive (MELP) standard to a bit stream encoded according to a time domain voicing cutoff (TDVC) standard, comprising:
decoding a bit stream into a first set of vocoder parameters compatible with the MELP standard;
transforming the first set of vocoder parameters into a second set of vocoder parameters compatible with the TDVC standard without converting the first set of vocoder parameters to an analog or digital waveform representation; and
encoding the second set of vocoder parameters into a bit stream compatible with the TDVC standard.
2. The method of claim 1, wherein the transforming includes converting MELP spectrum, voicing, pitch, and gain parameters to TDVC spectrum, voicing, pitch, and gain parameters.
3. The method of claim 2, wherein the converting of MELP voicing parameters to TDVC voicing parameters comprises:
converting the MELP overall voicing bit and five bandpass voicing strengths in each frame to a TDVC voicing cutoff frequency parameter (fsel).
4. The method of claim 3, wherein if the MELP overall voicing bit is one (unvoiced), then the TDVC voicing cutoff frequency parameter (fsel) is set to zero (unvoiced).
5. The method of claim 4, wherein if the MELP overall voicing bit is zero (voiced), then the TDVC voicing cutoff frequency parameter is assigned by:
identifying the highest voiced MELP frequency band; and
assigning a value for the TDVC voicing cutoff frequency parameter (fsel) which most closely corresponds to the frequency cutoff of the highest voiced frequency band.
6. The method of claim 2, wherein the converting of MELP pitch parameters to TDVC pitch parameters comprises:
taking an inverse logatithm of each MELP pitch parameter.
7. The method of claim 2, wherein the converting of MELP gain parameters to TDVC gain parameters futher comprises:
converting the two half-frame MELP gains per frame to a single TDVC gain per frame by logarithmically averaging the two half-frame MELP gains in each frame.
8. The method of claim 2, further comprising:
linearly interpolating 8 frames of MELP spectrum, voicing, pitch and gain parameters to create 9 frames of TDVC spectrum, voicing, pitch and gain parameters.
9. The method of claim 2, further comprising:
quantizing and encoding the interpolated TDVC spectrum, voicing, pitch, and gain parameters according to the TDVC standard.
10. A method of converting MELP parameters to TDVC parameters, comprising:
receiving MELP parameters; and
transforming the MELP parameters to TDVC parameters without converting to a decompressed form.
11. A transcoder for transcoding a bit stream encoded according to an mixed-excitation linear predictive (MELP) standard to a bit stream encoded according to a time domain cutoff voicing (TDVC) standard, comprising:
a decoder decoding a bit stream into a first set of vocoder parameters compatible with the MELP standard;
a conversion unit transforming the first set of vocoder parameters into a second set of vocoder parameters compatible with the TDVC standard without converting the first set of vocoder parameters to an analog or digital waveform representation; and
an encoder encoding the second set of vocoder parameters into a bit stream compatible with the TDVC vocoder standard.