Expandable bandwidth compression and restoration system

Details Expandable bandwidth compression and restoration system Expandable bandwidth compression and restoration system

1983-01-25

1984-07-17

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

328 25, G10L 100

Patent

active

044610220

ABSTRACT:
Bandwidth compression using frequency divider is applied to original or heterodyned signals. A bandwidth compressor digitally divides the frequency of information signals by an integer n and impresses amplitude modulation components of the information signals upon the frequency-divided signal. The compressed-bandwidth signal may be expanded and, thereby, restored to a signal approximating the information signals by multiplying the frequency of the compressed signal by the integer n. Fidelity of the compression and reconstruction process is modularly expandable by dividing information signals into a plurality of narrow bandwidth signals, compressing the latter with a plurality of bandwidth compressors as described, summing the compressed signals and reconstructing the information signal with a plurality of bandwidth expanders as described.

REFERENCES:
patent: 3349184 (1967-10-01), Morgan
patent: 3582812 (1971-06-01), Kochi
patent: 3602824 (1971-08-01), Rusch
patent: 3784754 (1974-01-01), Hagiwara et al.
patent: 4130734 (1978-12-01), Lee

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