EP0516216A2
Expired / Lapsed
EP
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Echo cancellation system
Assignee: Koninklijke Philips NV
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Filing: 1992-05-19
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Granted: —
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Expires: 2012-05-19
Abstract
Abstract A circuit architecture suitable for use in a television receiver which effectively performs a ghost or echo cancellation procedure on post-echo components and pre-echo components occurring within the transmission channel. The apparatus features a filter circuit architecture which can be configured under programmed control so as to partition groups of its filter sections to form IIR filters and FIR filters. The filter architecture is suitable for use in multi-circuit configurations and can be used with clustering algorithms to increase the efficiency and optimize the use of the available circuit architecture.
Inventors
- 👤 Craig Bradley Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:15
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H03; H03H; H03H17/00; H03H17/02; H03H17/0294; H03H17/0283; H03H17/0286; H03H17/0288; H04N5/211
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
307 words
A digital signal processing apparatus suitable for use as a filter circuit in a device which, after receiving and deriving a plurality of signal samples from a signal transmitted over a transmission path, identifies and substantially removes path induced distortion to said signal, wherein said device comprises a processor means for deriving a set of filter coefficients and a set of configuration control signals related to distortion components of said path induced distortion, said apparatus comprising: a) first providing means for providing said control words and said coefficients to said apparatus; b) second providing means for providing said signal samples to said apparatus and for providing processed samples from said apparatus, said second providing means comprising an unprocessed sample input, first and second processed sample inputs, and first and second sample outputs; c) a plurality of filter sections each comprising: i. means switchably coupled to said first and second sample outputs, for selecting as filter section input samples, one of said first and second sample outputs under the control of a second control signal; ii. delay means coupled to said selecting means, for providing a delay to said filter section input samples; iii. a filter stage comprising a plurality of taps, a first filter input coupled to said delay means for receiving said delayed filter section input samples, a first stage output, a second stage output switchably connected to said first processed sample input under the control of a first control signal, a third stage output switchably coupled to said second processed sample input under the control of a second control signal, and a second filter input switchably coupled to the first stage output of an adjacent filter stage; and d) means for configuring a first group of said filter sections into a first filter and a second group of said filter sections into a second filter.
Claim 2
Dependent Claim
307 words
A digital signal processing apparatus suitable for use as a filter circuit in a device which, after receiving and deriving a plurality of signal samples from a signal transmitted over a transmission path, identifies and substantially removes path induced distortion to said signal, wherein said device comprises a processor means for deriving a set of filter coefficients and a set of configuration control signals related to distortion components of said path induced distortion, said apparatus comprising: a) first providing means for providing said control words and said coefficients to said apparatus; b) second providing means for providing said signal samples to said apparatus and for providing processed samples from said apparatus, said second providing means comprising an unprocessed sample input, first and second processed sample inputs, and first and second sample outputs; c) a plurality of filter sections each comprising: i. means switchably coupled to said first and second sample outputs, for selecting as filter section input samples, one of said first and second sample outputs under the control of a second control signal; ii. delay means coupled to said selecting means, for providing a delay to said filter section input samples; iii. a filter stage comprising a plurality of taps, a first filter input coupled to said delay means for receiving said delayed filter section input samples, a first stage output, a second stage output switchably connected to said first processed sample input under the control of a first control signal, a third stage output switchably coupled to said second processed sample input under the control of a second control signal, and a second filter input switchably coupled to the first stage output of an adjacent filter stage; and d) means for configuring a first group of said filter sections into a first filter and a second group of said filter sections into a second filter.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1, wherein said first filter is an FIR filter and said second filter is an IIR filter.
Claim 4
Dependent Claim
26 words
The apparatus of claim 1 wherein said configuring means comprises means for providing a programmable delay to the samples provided by each of said first inputs.
Claim 5
Dependent Claim
21 words
The apparatus of claim 1 wherein said second providing means comprises means for coupling said apparatus to a second said apparatus.
Claim 6
Dependent Claim
157 words
A television receiver for use in an echo cancellation system in which a television signal comprising a plurality of frames each comprising a GCR signal, is transmitted over a transmission path having a distortion characteristic which adds at least one echo component to said signal, said receiver comprising: (a) means for receiving said signal; (b) means for periodically analyzing said GCR and for calculating a plurality of filter coefficients defining the inverse distortion characteristic of said transmission path and a plurality of control signals related to said at least one echo component; and (c) a filter circuit coupled to said analyzing means, which is periodically provided with said coefficients and control signals and which comprises a plurality of filter sections which are configured, in response to said control signals, into a first filter suitable for substantially cancelling a first type of echo component and a second filter suitable for substantially cancelling a second type of echo component.
Claim 7
Dependent Claim
157 words
A television receiver for use in an echo cancellation system in which a television signal comprising a plurality of frames each comprising a GCR signal, is transmitted over a transmission path having a distortion characteristic which adds at least one echo component to said signal, said receiver comprising: (a) means for receiving said signal; (b) means for periodically analyzing said GCR and for calculating a plurality of filter coefficients defining the inverse distortion characteristic of said transmission path and a plurality of control signals related to said at least one echo component; and (c) a filter circuit coupled to said analyzing means, which is periodically provided with said coefficients and control signals and which comprises a plurality of filter sections which are configured, in response to said control signals, into a first filter suitable for substantially cancelling a first type of echo component and a second filter suitable for substantially cancelling a second type of echo component.
Claim 8
Dependent Claim
21 words
The receiver of claim 5, wherein said first filter is an FIR filter and said second filter is an IIR filter.
Claim 9
Dependent Claim
143 words
A digital signal processing apparatus suitable for use as a filter circuit in an echo cancellation system in which a television signal comprising a GCR signal is transmitted over a transmission path having a distortion characteristic which adds at least one echo component to said signal and comprises means for periodically analyzing said GCR and for calculating a plurality of filter coefficients defining the inverse distortion characteristic of said transmission path and a plurality of control signals related to said at least one echo component, wherein said signal processing apparatus is periodically provided with said coefficients and control signals and comprises a plurality of filter sections which are configured, in response to said control signals, into a first filter suitable for substantially cancelling a first type of echo component and a second filter suitable for substantially cancelling a second type of echo component.
Claim 10
Dependent Claim
143 words
A digital signal processing apparatus suitable for use as a filter circuit in an echo cancellation system in which a television signal comprising a GCR signal is transmitted over a transmission path having a distortion characteristic which adds at least one echo component to said signal and comprises means for periodically analyzing said GCR and for calculating a plurality of filter coefficients defining the inverse distortion characteristic of said transmission path and a plurality of control signals related to said at least one echo component, wherein said signal processing apparatus is periodically provided with said coefficients and control signals and comprises a plurality of filter sections which are configured, in response to said control signals, into a first filter suitable for substantially cancelling a first type of echo component and a second filter suitable for substantially cancelling a second type of echo component.
Claim 11
Dependent Claim
21 words
The apparatus of Claim 7, wherein said first filter is an FIR filter and said second filter is an IIR filter.
References Cited (Backward Citations)
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