Method and apparatus for digital data compression
Patent 4449536 Issued on May 22, 1984. Estimated Expiration Date: 
May 22, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 22, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSystem for display and analysis of physiological signals such as electrocardiographic (ECG) signals Patent #: 4098267 InventorApplicationNo. 06/202457 filed on 10/31/1980US Classes:600/509, Detecting heartbeat electric signal708/203Compression/decompressionExaminersPrimary: Kamm, William E.Attorney, Agent or FirmInternational ClassesA61B 5/00 (20060101)H03M 7/42 (20060101) AbstractDigital data compression method and means are disclosed which allow for transmission of digital data over a short time period and/or narrow bandwidth transmission line. Also a maximum amount of information may be stored on a movable recording medium using data compression method of this invention. Digital signals to be stored and/or transmitted first are compressed using a finite-impulse response digital compression filter which generates estimated signal values which are subtracted from actual signal values to provide a sequence of difference signals. The difference signals are encoded using a truncated Huffman type encoding method and means, and the encoded signals are transmitted to a remote receiver and/or are recorded. The receiver includes a decoder and digital reconstruction filter for exact reproduction of transmitted digital signals. The invention is well adapted for storage and/or transmission of three lead electrocardiogram (ECG) signals, recording and playback of music, and the like.Other References
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