Patent 7804891

Prior art

Earlier patents, publications, and products that may anticipate or render the claims unpatentable.

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Prior art

Earlier patents, publications, and products that may anticipate or render the claims unpatentable.

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To identify the most relevant prior art for US Patent 7,804,891, I will examine the patent's cited references. Based on the provided patent text, the "Citations" section lists several prior art documents.

Here's an analysis of the cited prior art:

Prior Art References for US Patent 7,804,891

The following documents are cited as prior art in US Patent 7,804,891:

  1. JPH05260021A (Matsushita Electric Works Ltd.)

    • Full Citation: JPH05260021A
    • Publication Date: 1993-10-08
    • Priority Date: 1992-03-13
    • Brief Description: This patent describes a "Communication control system." Without further details on its specific technical content, it broadly relates to communication systems.
    • Potential Anticipation (35 U.S.C. § 102): Due to the very general description, it's difficult to pinpoint specific claims it might anticipate without a deeper dive into its content. However, given its classification as a communication control system, it could potentially anticipate the broad concept of a "communication quality judging device" or "method" as described in Claims 1, 8, and 9, if it discloses elements of judging communication quality based on transmitted signals.

  2. JPH05284147A (Toshiba Corp.)

    • Full Citation: JPH05284147A
    • Publication Date: 1993-10-29
    • Priority Date: 1992-03-31
    • Brief Description: This reference details an "Error rate measuring device." This directly relates to assessing communication quality.
    • Potential Anticipation (35 U.S.C. § 102): This patent is highly relevant as it describes an "error rate measuring device," which directly pertains to judging communication quality. It could potentially anticipate the core aspects of judging communication quality in Claims 1, 8, and 9, particularly if it involves analyzing aspects of the received signal to determine errors, which is a fundamental part of the '891 patent's communication quality judging means/step.

  3. US5432778A (Telefonaktiebolaget Lm Ericsson)

    • Full Citation: US5432778A
    • Publication Date: 1995-07-11
    • Priority Date: 1992-06-23
    • Brief Description: This patent describes a "Method and an arrangement for frame detection quality estimation in the receiver of a radio communication system." This explicitly addresses quality estimation in a receiver.
    • Potential Anticipation (35 U.S.C. § 102): This reference is very pertinent. Its focus on "frame detection quality estimation in the receiver of a radio communication system" suggests it could anticipate the symbol judging means and communication quality judging means/steps of Claims 1, 8, and 9, especially regarding the reception and analysis of signals for quality assessment.

  4. JPH11220762A (Ntt Mobil Commun Network Inc)

    • Full Citation: JPH11220762A
    • Publication Date: 1999-08-10
    • Priority Date: 1998-01-30
    • Brief Description: This describes a "Radio paging coding controller." While related to communication, the specific focus on "paging coding controller" might make it less directly anticipatory of the core quality judging mechanism than other references, unless it also details quality assessment for transmitted data.
    • Potential Anticipation (35 U.S.C. § 102): The general nature of a "radio paging coding controller" makes direct anticipation difficult to assess without further detail. However, if this system includes any form of error detection or quality monitoring for the transmitted paging data, it could broadly relate to the concepts in Claims 1, 8, and 9.

  5. US6519740B1 (Telefonaktiebolaget Lm Ericsson (Publ))

    • Full Citation: US6519740B1
    • Publication Date: 2003-02-11
    • Priority Date: 1997-05-20
    • Brief Description: This patent details a "Bit detection method in a radio communications system." This is highly relevant to the symbol judging means of US7804891.
    • Potential Anticipation (35 U.S.C. § 102): A "bit detection method in a radio communications system" is directly relevant to the "symbol judging means" of Claim 1 and the "symbol judging step" of Claims 8 and 9, particularly if it involves obtaining a baseband signal and judging symbols from it. Depending on whether it further discloses using redundant bits for quality assessment, it could also impact the "communication quality judging means/step."

  6. WO2003019893A1 (Telecommunications Advancement Organization Of Japan)

    • Full Citation: WO2003019893A1
    • Publication Date: 2003-03-06
    • Priority Date: 2001-08-22
    • Brief Description: This PCT application describes a "Communication quality estimation method, communication quality estimation apparatus, and communication system." This is a very broad and directly relevant title.
    • Potential Anticipation (35 U.S.C. § 102): This is another highly relevant reference due to its title explicitly mentioning "communication quality estimation method" and "apparatus." It likely anticipates fundamental aspects of Claims 1, 8, and 9, especially concerning the broad idea of estimating communication quality in a system. The specific mechanism of using redundant bits would need to be compared in detail to determine full anticipation.

  7. JP2003099096A (Toshiba Corp)

    • Full Citation: JP2003099096A
    • Publication Date: 2003-04-04
    • Priority Date: 2001-09-26
    • Brief Description: This patent describes an "Audio decoding processing device and error compensating device used in this device." This relates to processing audio data and compensating for errors.
    • Potential Anticipation (35 U.S.C. § 102): This reference on an "audio decoding processing device and error compensating device" could potentially anticipate the "data changing means" of Claim 1 and the "changing data" step of Claims 8 and 9, particularly if its error compensation is triggered by a quality judgment and involves modifying the audio data (e.g., replacement or destruction).

  8. WO2003049392A1 (Sony Corporation)

    • Full Citation: WO2003049392A1
    • Publication Date: 2003-06-12
    • Priority Date: 2001-12-07
    • Brief Description: This PCT application describes a "Data communication control system, transmitter, and transmitting method." This is a broad communication system patent.
    • Potential Anticipation (35 U.S.C. § 102): Similar to JPH05260021A, the broad title "Data communication control system" makes precise anticipation difficult without more information. However, if it includes any mechanisms for monitoring or reacting to communication quality, it could generally relate to the concepts in Claims 1, 8, and 9.

  9. US7168031B2 (Siemens Aktiengesellschaft)

    • Full Citation: US7168031B2
    • Publication Date: 2007-01-23
    • Priority Date: 2000-04-14
    • Brief Description: This patent describes a "Method for channel decoding a data stream containing useful data and redundant data, device for channel decoding, computer-readable storage medium and computer program element." This is highly relevant as it discusses redundant data for decoding.
    • Potential Anticipation (35 U.S.C. § 102): This reference is very strong prior art. Its description of a "method for channel decoding a data stream containing useful data and redundant data" directly overlaps with the '891 patent's use of a "protected portion" and "redundant bit having a predetermined value." It could potentially anticipate the core "communication quality judging means/step" of Claims 1, 8, and 9 if it teaches identifying the number of redundant bits having or missing a predetermined value for communication quality judgment. The publication date (2007-01-23) is after the filing date of US7804891 (2005-03-30), so this would only be prior art if its priority date (2000-04-14) effectively predates the '891 patent's priority date (2004-03-31). This seems to be the case, making it highly relevant.

Most Relevant Prior Art:

Based on the descriptions, US7168031B2, US5432778A, US6519740B1, and WO2003019893A1 appear to be the most relevant prior art references.

  • US7168031B2 is particularly strong because it explicitly mentions "redundant data" in a data stream and a method for "channel decoding" it, which directly aligns with the core mechanism of using redundant bits for communication quality judgment in US7804891.
  • US5432778A and WO2003019893A1 are highly relevant for their explicit focus on "quality estimation/judgment" in communication systems.
  • US6519740B1 directly addresses "bit detection method in a radio communications system," which is foundational to the symbol judging aspects of the '891 patent.

Further detailed analysis of the claims and specifications of these highly relevant prior art documents would be necessary to make definitive conclusions about anticipation under 35 U.S.C. § 102.

Generated 5/18/2026, 6:46:29 PM