Patent US5224123A successfully refreshed from Google Patents.
US5224123A
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Transversal equalizer
Assignee: Toshiba Corp
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Filing: 1992-07-31
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Granted: 1993-06-29
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Expires: 2012-07-31
Abstract
Abstract A transversal equalizer having first and second transversal filters, each including a plurality of adders and a set of multipliers, and each of which equalizes input sample values based on tap coefficients applied to the multipliers and outputs the resulting signal, a combining circuit in the second transversal filter for combining the output signal of the first transversal filter with the signal being processed in the second transversal filter and a switch which connects the first output signal from the first transversal filter to either the combining circuit of the second transversal filter or to the input of the second transversal filter.
Inventors
- 👤 Hiroyuki Iga
- 👤 Masaki Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:09
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H04N5/211; H03; H03H; H03H17/00; H03H17/02; H03H17/06; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03057; H03H2017/0692; H04L2025/03592; H04L2025/03598; H04L2025/03611; H04L2025/03656; H04L2025/03662
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
337 words
A transversal equalizer comprising: a first transversal filter comprising a first input means for receiving a first equalizer input signal, a plurality of multiplier means, coupled in parallel to said first input means, for respectively multiplying said first equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, a cascade input means coupled to a first of said adder means of said first transversal filter for receiving a cascade equalizer input signal and a first output means coupled to a last of said delay means for outputting a first output signal; a second transversal filter comprising a second input means for receiving a second equalizer input signal or said first equalizer input signal, a plurality of multiplier means, coupled in parallel to said second input means, for respectively multiplying said second equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, an equalizer output means coupled to a last delay means for outputting an equalizer output signal and a second cascade input means and third cascade input means for inputting a cascade input signal, said second cascade input means being coupled to a first adder means of said second transversal filter, said third cascade input means being coupled to a combining means for adding a cascade input signal to a signal being processed in said second transversal filter, said combining means being coupled to an adder means of said second transversal filter other than said first adder means; and a switch means for connecting said first output signal from said first transversal filter to either said second cascade input means or said third cascade input means of said second transversal filter.
Claim 2
Dependent Claim
337 words
A transversal equalizer comprising: a first transversal filter comprising a first input means for receiving a first equalizer input signal, a plurality of multiplier means, coupled in parallel to said first input means, for respectively multiplying said first equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, a cascade input means coupled to a first of said adder means of said first transversal filter for receiving a cascade equalizer input signal and a first output means coupled to a last of said delay means for outputting a first output signal; a second transversal filter comprising a second input means for receiving a second equalizer input signal or said first equalizer input signal, a plurality of multiplier means, coupled in parallel to said second input means, for respectively multiplying said second equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, an equalizer output means coupled to a last delay means for outputting an equalizer output signal and a second cascade input means and third cascade input means for inputting a cascade input signal, said second cascade input means being coupled to a first adder means of said second transversal filter, said third cascade input means being coupled to a combining means for adding a cascade input signal to a signal being processed in said second transversal filter, said combining means being coupled to an adder means of said second transversal filter other than said first adder means; and a switch means for connecting said first output signal from said first transversal filter to either said second cascade input means or said third cascade input means of said second transversal filter.
Claim 3
Dependent Claim
39 words
A transversal equalizer as in claim 1, wherein said switch means further comprises an external control means for externally controlling the connection of said first output means to said second cascade input means or said third cascade input means.
Claim 4
Dependent Claim
27 words
A transversal equalizer as claimed in claim 1, wherein said first transversal filter is recursive and said second transversal filter is configurable as either recursive or non-recursive.
Claim 5
Dependent Claim
53 words
A transversal equalizer as claimed in claim 3, wherein said second transversal filter is configured as recursive when said second input means receives said first equalizer input signal and said switch means connects said first output signal of said first transversal filter to said second cascade input means of said second transversal filter.
Claim 6
Dependent Claim
63 words
A transversal equalizer as in claim 3, wherein said second transversal filter is configured as non-recursive when said second input means receives said second equalizer input signal and said switch means connects said first output signal from said first transversal filter to said third cascade input means of said second transversal filter and said first equalizer input signal is said equalizer output signal.
Claim 7
Dependent Claim
354 words
A transversal equalizer comprising: a first transversal filter comprising a first input means for receiving a first equalizer input signal, a plurality of multiplier means, coupled in parallel to said first input means, for respectively multiplying said first equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, a cascade input means coupled to a first of said adder means of said first transversal filter for receiving a cascade equalizer input signal and a first output means coupled to a last of said delay means for outputting a first output signal; a second transversal filter comprising a second input means for receiving a second equalizer input signal of said first equalizer input signal, a plurality of multiplier means, coupled in parallel to said second input means, for respectively multiplying said second equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, an equalizer output means coupled to a last delay means for outputting an equalizer output signal and a second cascade input means and third cascade input means for inputting a cascade input signal, said second cascade input means being coupled to a first adder means of said second transversal filter, said third cascade input means being coupled to a combining means for adding a cascade input signal to a signal being processed in said second transversal filter, said combining means being coupled to an adder means of said second transversal filter other than said first adder means; and a switch means for connecting said first output signal from said first transversal filter to either said second cascade input means or said third cascade input means of said second transversal filter, wherein said first transversal filter comprises a larger number of multiplier means than said second transversal filter.
Claim 8
Dependent Claim
354 words
A transversal equalizer comprising: a first transversal filter comprising a first input means for receiving a first equalizer input signal, a plurality of multiplier means, coupled in parallel to said first input means, for respectively multiplying said first equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, a cascade input means coupled to a first of said adder means of said first transversal filter for receiving a cascade equalizer input signal and a first output means coupled to a last of said delay means for outputting a first output signal; a second transversal filter comprising a second input means for receiving a second equalizer input signal of said first equalizer input signal, a plurality of multiplier means, coupled in parallel to said second input means, for respectively multiplying said second equalizer input signal by predetermined coefficients, a plurality of adder means respectively coupled to outputs of said multiplier means for adding said outputs of said multiplier means, a plurality of delay means coupled to outputs of respective adder means for delaying outputs thereof, an equalizer output means coupled to a last delay means for outputting an equalizer output signal and a second cascade input means and third cascade input means for inputting a cascade input signal, said second cascade input means being coupled to a first adder means of said second transversal filter, said third cascade input means being coupled to a combining means for adding a cascade input signal to a signal being processed in said second transversal filter, said combining means being coupled to an adder means of said second transversal filter other than said first adder means; and a switch means for connecting said first output signal from said first transversal filter to either said second cascade input means or said third cascade input means of said second transversal filter, wherein said first transversal filter comprises a larger number of multiplier means than said second transversal filter.
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