Signal encoder using orthogonal transform

Details Signal encoder using orthogonal transform Signal encoder using orthogonal transform

1982-02-25

1985-04-09

Malzahn, David H.

Boots, shoes, and leggings

358138, G06F 15332

Patent

active

045105782

ABSTRACT:
The invention provides an encoder for subjecting an input signal to the orthogonal transform for band compression and encoding. The encoder has a sample and hold circuit which samples the input signal at a sampling frequency three times that of the input signal, and an orthogonal transform unit which subjects the sampled signal to the orthogonal transform using as a coefficient an orthogonal matrix function of the order of 3n (where n is an integer of 2 or more) having as a minor matrix an orthogonal matrix of the order of 3: ##EQU1## having given numbers a, b and c as matrix elements. By maintaining the sampling frequency low, the frequency components of the input signal may be concentrated in a small number of transform outputs without causing an increase in the amount of data to be processed, without using a multiplier and without requiring an increase in the processing speed. The input signal is thus effectively band compressed and encoded.

REFERENCES:
patent: 3920974 (1975-11-01), Means
patent: 4055756 (1977-10-01), Jolivet et al.
patent: 4189748 (1980-02-01), Reis
patent: 4196448 (1980-04-01), Whitehouse et al.
patent: 4389673 (1983-06-01), Despois et al.

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