Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Time-scale modification method and apparatus for digital signals










Image Number 2 for United States Patent #6801898.

According to a time-scale modification method or apparatus, wave segments each having a prescribed cutting length are sequentially cut from original digital signal waves stored in a waveform memory and are then spliced together by way of cross-fading, so it is possible to realize time-scale modification (i.e., compression or expansion with respect to time) in accordance with a designated time-scale modification factor. Herein, time-scale modification parameters such as a cross-fade duration, a search start time and a search end time are produced in response to the designated time-scale modification factor. In addition, a cutting start position is used for cutting a next wave segment following a present wave segment. The cutting start time is determined within a period of time between the search start time and search end time in such a way that it is placed to provide a best similarity between the wave segments having prescribed portions which are connected with each other by way of cross-fading. Specifically, a back-end portion of the present wave segment and a top portion of the next wave segment are smoothly connected together by way of the cross-fading, wherein they have the same cross-fade duration. The cross-fade duration is controlled to be longer as the time-scale modification factor becomes greater or smaller than "1". The cross-fading is actualized by a window function having different cross-fade coefficients, which are varied over a lapse of time and by which data of the prescribed portions of the wave segments are multiplied and mixed together.








 
 
  Recently Added Patents
5-HT.sub.3 receptor modulators, methods of making, and use thereof
Triazole derivatives as ghrelin analogue ligands of growth hormone secretagogue receptors
Method and system for coordinating client and host security modules
.beta.-2 microglobulin as a biomarker for peripheral artery disease
Fluid conduit with PTC fabric heating
Method for driving bistable display device
Plants and seeds of hybrid corn variety CH089600
  Randomly Featured Patents
Electromagnetically actuated quick-action switching valve
Easy strip access primary container and methods of manufacturing and utilization thereof
Port indicator
Enhanced radiation cure
Semiconductor device having a shield plate for applying electric potential to the semiconductor substrate
Dampened compression spring rod
Continuous process for the production of aldehydes by hydroformylation of olefins
Wet type air cleaner
Measuring apparatus
Organic solvent free pigment dispersant for waterborne electrocoating