Boots – shoes – and leggings
Patent
1995-04-14
1997-11-25
Ramirez, Ellis B.
Boots, shoes, and leggings
G06F 1700
Patent
active
056919166
ABSTRACT:
A method of calculating the transmission quality of a series of cascaded codecs, wherein for each type of codec, a function is determined which is specific for the relationship between the Q-equivalent over a series of codecs of that same type and the number of codecs which said series includes. The type sequence is determined of the series of codecs such as those cascaded in the transmission medium. The series is traversed in steps and, starting from the Q-equivalent for one codec of the type which occurs as the first in the series of codecs, the Q-equivalent is always calculated over the traversed part of the series by calculating, starting from the Q-equivalent calculated last, the next Q-equivalent under the control of the function which is specific for the type of the last codec in said part which has been traversed. The Q-equivalent finally calculated for the entire codec series is converted into a MOS value which is a measure of the subjective quality of the codec series.
REFERENCES:
patent: 4578797 (1986-03-01), Satoh et al.
patent: 5313280 (1994-05-01), Straus
patent: 5533121 (1996-07-01), Suzuki et al.
Article entitled Subjective Quality of Several 9.6-32 kb/s Speech Coders, by W.R. Daumer, et al, published in Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, pp. 1709-1712, May, 1982.
Article entitled On Tandem Coding of Speech, by V. Ramamoorthy published in Proceedings of the IEE International Conference, pp. 1229-1233, Jun., 1985 .
Dignum Robertus Laurentius Maria
Emons Michel Johannes Wilhelmus Maria
Van Den Brink Wilhelmus Albertus Christianus
Koninklijke PTT Nederland N.V.
Ramirez Ellis B.
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