US3624562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic equalizer for random input signals
Assignee: Fujitsu Ltd
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Filing: 1970-03-19
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Granted: 1971-11-30
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Expires: 1990-03-19
Abstract
Abstract Input signals to a transversal filter are made random by the scrambler which is provided at the sender side. The transversal filter includes multipliers. A correlation detector having filters is connected to the transversal filter. A descrambler connected to the transversal filter converts the equalized random signals provided by the transversal filter into signals which are similar to the input signals. A connector connects the filters of the correlation detector to the multipliers of the transversal filter to control the multipliers by control signals produced by the filters.
Inventors
- 👤 Noriaki Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:01
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03038
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
253 words
An automatic equalizer for random signals, comprising input means for providing input signals; scrambler means provided for making the input signals random; a transversal filter comprising a delay line connected to said scrambler means, said delay line having a plurality of outputs, a plurality of multipliers each connected to a corresponding one of the outputs of said delay line for automatically adjusting the output signals of the delay line in said outputs under the control of control signals, and a combining circuit connected to said multipliers for combining the outputs of said multipliers; a correlation detector comprising a delay line connected to the combining circuit of said transversal filter, said delay line having a plurality of outputs, one of said outputs being central to the others, a polarity discriminator connected to said one of the outputs of the lastmentioned delay line, a plurality of product circuits connected in common to said polarity discriminator and each connected to a corresponding one of the outputs of the last-mentioned delay line for multiplying the output signals in each output by a multiplier supplied by said polarity discriminator, and a plurality of filters each connected to a corresponding one of said product circuits, said filters having a common output connected to the multipliers of said transversal filter for supplying the control signals to said multipliers; and descrambler means connected to the output of the combining circuit of said transversal filter for converting the equalized random signals provided by said transversal filter into signals which are mutually correlated.
Claim 2
Dependent Claim
253 words
An automatic equalizer for random signals, comprising input means for providing input signals; scrambler means provided for making the input signals random; a transversal filter comprising a delay line connected to said scrambler means, said delay line having a plurality of outputs, a plurality of multipliers each connected to a corresponding one of the outputs of said delay line for automatically adjusting the output signals of the delay line in said outputs under the control of control signals, and a combining circuit connected to said multipliers for combining the outputs of said multipliers; a correlation detector comprising a delay line connected to the combining circuit of said transversal filter, said delay line having a plurality of outputs, one of said outputs being central to the others, a polarity discriminator connected to said one of the outputs of the lastmentioned delay line, a plurality of product circuits connected in common to said polarity discriminator and each connected to a corresponding one of the outputs of the last-mentioned delay line for multiplying the output signals in each output by a multiplier supplied by said polarity discriminator, and a plurality of filters each connected to a corresponding one of said product circuits, said filters having a common output connected to the multipliers of said transversal filter for supplying the control signals to said multipliers; and descrambler means connected to the output of the combining circuit of said transversal filter for converting the equalized random signals provided by said transversal filter into signals which are mutually correlated.
Claim 3
Dependent Claim
18 words
An automatic equalizer as claimed in claim 1, wherein the filters of said correlation detector are low-pass filters.
Claim 4
Dependent Claim
175 words
An automatic equalizer for random signals, comprising a transversal filter comprising a first delay line having a plurality of output taps, a plurality of multipliers connected to the output taps of the first delay line for automatically adjusting the outputs of the first delay line by control signals, and a combining circuit connected to the multipliers for combining the outputs of the multipliers; and a correlation detector comprising a second delay line connected to the combining circuit, said second delay line having a plurality of output taps, a polarity discriminator connected to one of the output taps of the second delay line, a plurality of product circuits, and a plurality of low-pass filters connected to the other output taps of the second delay line through the product circuits, the polarity discriminator having an output connected to the product circuits and the low-pass filters having outputs connected to the multipliers of the transversal filter whereby the outputs of the low-pass filters are utilized as the control signals for adjusting the outputs of the first delay line.
Claim 5
Dependent Claim
175 words
An automatic equalizer for random signals, comprising a transversal filter comprising a first delay line having a plurality of output taps, a plurality of multipliers connected to the output taps of the first delay line for automatically adjusting the outputs of the first delay line by control signals, and a combining circuit connected to the multipliers for combining the outputs of the multipliers; and a correlation detector comprising a second delay line connected to the combining circuit, said second delay line having a plurality of output taps, a polarity discriminator connected to one of the output taps of the second delay line, a plurality of product circuits, and a plurality of low-pass filters connected to the other output taps of the second delay line through the product circuits, the polarity discriminator having an output connected to the product circuits and the low-pass filters having outputs connected to the multipliers of the transversal filter whereby the outputs of the low-pass filters are utilized as the control signals for adjusting the outputs of the first delay line.
Claim 6
Dependent Claim
35 words
An automatic equalizer as claimed in claim 3, wherein the first delay line has an input, and further comprising scrambler means connected to the input of the first delay line for making incoming signals random.
Claim 7
Dependent Claim
41 words
An automatic equalizer as claimed in claim 3, wherein the combining circuit of the transversal filter has an output, and further comprising descrambler means connected to the output of said combining circuit for converting equalized random signals into mutually correlated signals.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |