Patent US4839649A successfully refreshed from Google Patents.
US4839649A
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Signal processing system
Assignee: Advance Kaihatsu Kenkyujo KK
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Filing: 1987-07-09
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Granted: 1989-06-13
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Expires: 2007-07-09
Abstract
Abstract A signal processing system capable of converting various input analog signals including bioelectric signals, such as electrocardiographic signals, electro-encephlographic signals, and pulse wave signals, into digital signals by A/D converter, compressing the converted data by data compression, recording the compressed data on a compressed data recorder, regenerating the compressed data fetched from the compressed data recorder by data regeneration including a Huffman decoder, mode selector and regenerated data forming device, and then providing analog signals corresponding to the regenerated data.
Inventors
- 👤 Hideki Imai
- 👤 Minoru Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:09
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/30; H03M7/40; H03M3/00; H03M3/02; H03M3/022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
A method of processing analog signals, comprising the steps of: converting the analog input signals into digital data; and receiving the converted digital data at periodic sampling intervals; compressing the received converted digital data values, said step of compressing including the substeps of: storing a plurality of delta modulation modes, each mode including a plurality of predetermined prediction values; comparing each received detected data value with the predetermined prediction values of a selected mode; determining the sample point value of each compared digital data value in accordance with a selected one of the plurality of prediction values of the selected mode; and selecting one of the plurality of modes for comparing the presently received data in accordance with the selected one of the prediction value of previously received data.
Claim 2
Independent Claim
129 words
A method of processing analog signals, comprising the steps of: converting the analog input signals into digital data; and receiving the converted digital data at periodic sampling intervals; compressing the received converted digital data values, said step of compressing including the substeps of: storing a plurality of delta modulation modes, each mode including a plurality of predetermined prediction values; comparing each received detected data value with the predetermined prediction values of a selected mode; determining the sample point value of each compared digital data value in accordance with a selected one of the plurality of prediction values of the selected mode; and selecting one of the plurality of modes for comparing the presently received data in accordance with the selected one of the prediction value of previously received data.
Claim 3
Dependent Claim
17 words
A signal processing system according to claim 1, when in said input signal is an electrocardiographic signal.
Claim 4
Dependent Claim
35 words
The method of claim 5, wherein the substep of comparing includes selecting a comparison time subsequent to each preceding sample point value in accordance with the selected mode for the preceding sample point data value.
Claim 5
Dependent Claim
38 words
The method of claim 1, wherein the step of compressing further includes the substep of selecting the mode in accordance with the step width value between each of the plurality of prediction values of the previously selected mode.
Claim 6
Dependent Claim
27 words
The method of claim 5, further comprising the steps of: encoding each of the sample point values with a Huffman code; and recording the coded data values.
Claim 7
Independent Claim
202 words
A method of processing analog signals, comprising the steps of: converting the analog input signals into digital data; and receiving the converted digital data at periodic sampling intervals; compressing the received converted digital data value, said step of compressing including the substeps of, storing a plurality of delta modulation modes, each mode including a plurality of predetermined prediction values, comparing each received detected data value with the predetermined prediction value of a selected mode, determining the sample point value of each compared digital data value in accordance with a selected one of the plurality of prediction values of the selected mode, selecting one of the plurality of modes for comparing the presently received data in accordance with the selected one of the prediction values of previously received data, encoding each of the sampled data values with a Huffman code, and recording the Huffman coded data values; and regenerating the recorded digital data, said step of regenerating including the substeps of, decoding the recorded Huffman coded data values in sequence, selecting one of the plurality of delta modulation modes in accordance with each respective decoded data value, and linearly interpolating the decoded data values between each of the decoded sample point data values.
Claim 8
Independent Claim
202 words
A method of processing analog signals, comprising the steps of: converting the analog input signals into digital data; and receiving the converted digital data at periodic sampling intervals; compressing the received converted digital data value, said step of compressing including the substeps of, storing a plurality of delta modulation modes, each mode including a plurality of predetermined prediction values, comparing each received detected data value with the predetermined prediction value of a selected mode, determining the sample point value of each compared digital data value in accordance with a selected one of the plurality of prediction values of the selected mode, selecting one of the plurality of modes for comparing the presently received data in accordance with the selected one of the prediction values of previously received data, encoding each of the sampled data values with a Huffman code, and recording the Huffman coded data values; and regenerating the recorded digital data, said step of regenerating including the substeps of, decoding the recorded Huffman coded data values in sequence, selecting one of the plurality of delta modulation modes in accordance with each respective decoded data value, and linearly interpolating the decoded data values between each of the decoded sample point data values.
Claim 9
Dependent Claim
17 words
A signal processing system according to claim 6, where n said input signal is an electrocardiographic signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |