US 7817208

Here's a concise summary of US Patent 7817208:

US Patent 7817208

• Title: Signal processing apparatus and methods
• Current Assignee: Contentnexus LLC
• Original Assignee: Personalized Media Communications LLC
• Inventors: John Christopher Harvey, James William Cuddihy
• Filing Date: 1995-06-07
• Issue Date: 2010-10-19

Abstract:
A signal processing apparatus and method for communications. The system and method includes capacity for automatically organizing multi-channel communications. The system has capacity for transmitting to standardized programming that is very simple for subscribers to play and understand. The system has capacity for transmitting data and control instructions in the same information stream to many different apparatus at a given subscriber station, for causing computers to generate and transmit programming, and for causing receiver apparatus to operate on the basis of programming and information received at widely separated times.

Plain-Language Overview of Independent Claims:

The patent contains two independent claims, Claim 1 and Claim 54.

Independent Claim 1:
This claim describes a system designed for processing broadcast programming. In simple terms, this system receives broadcast signals that include both regular programming (like TV or radio) and embedded control signals. These control signals are very specific; they contain digital information that tells other equipment at a subscriber's location what to do and when to do it. The system can detect these hidden signals, convert them into a usable digital format, and then use them to control various devices, such as computers, video recorders, or even other signal processing units, at the subscriber's station. Crucially, it can instruct these devices to perform actions that are synchronized with the broadcast content, or even record monitoring information about what's being viewed or used. The system also has a programmable controller that can modify these instructions, allow for decryption of content, and record usage data.

Independent Claim 54:
This claim focuses on a method for processing and distributing broadcast programming at an "intermediate transmission station" (like a cable headend or local broadcast affiliate). This method involves receiving broadcast programming that also contains embedded digital control signals. These control signals are designed to manage the handling and display of programming at many different "ultimate receiver stations" (subscriber homes, offices, etc.). The method includes extracting these control signals, processing them to control equipment at the intermediate station itself (e.g., to generate additional content or modify the broadcast), and then retransmitting the programming, potentially with new or modified embedded signals. This allows a central broadcaster to not only control how programming is distributed and presented downstream but also to gather monitoring information about its usage across a wide network of subscribers.

CAFC 2026 Dockets:
A search for "US patent 7817208 CAFC 2026 dockets" did not return specific docket entries for this patent in 2026 within the provided search results. The search results show general information about the CAFC, its recent decisions on other patents, and its schedule for May, June, and July 2026, but not specific litigation involving US7817208.

As a patent attorney, I have investigated known litigation involving US Patent 7817208.

Based on the available information, a direct search for "US patent 7817208 litigation" or "US7817208 lawsuit" across common patent litigation databases like Unified Patents did not return specific, detailed case information such as plaintiffs, defendants, case numbers, filing dates, and outcomes.

Therefore, I cannot provide a list of known litigation cases with the requested details at this time.

Proceedings overview

There is no PTAB activity on file for US Patent 7817208. This means the patent has not yet been challenged in an AIA trial proceeding, giving a defendant a wide range of potential prior art grounds to pursue if facing assertion.

Strategic summary

As there are no PTAB proceedings on file for US7817208, all claims of the patent remain untested in an AIA trial setting. This means no claims have been canceled or sustained through IPR, PGR, or CBM. Consequently, the estoppel provisions of 35 U.S.C. § 315(e)(2) do not apply, leaving all prior-art grounds open for potential future petitioners. The absence of PTAB activity suggests that either the patent has not been extensively asserted, or prior challenges have not taken the form of AIA trials.

Recommended next steps

If you are a defendant facing assertion of US7817208, consider evaluating the patent for potential IPR challenges. The lack of prior PTAB proceedings means that a wide range of prior art and invalidity arguments are available. No specific deadlines for PTAB milestones are applicable since no proceedings have been initiated.

Inventors

• John Christopher Harvey: Employer at time of filing not determinable from the patent document.
• James William Cuddihy: Employer at time of filing not determinable from the patent document.

No unusual patterns, such as all inventors departing the original assignee within 12 months of filing, can be determined from the available patent text.

Original assignee

The original assignee is Personalized Media Communications LLC. It is not determinable from the provided information whether they shipped a product embodying the claims or their primary line of business. Their current status is "Active" as per the Google Patents legal status.

Assignment timeline

• 2000-09-22 (executed) / recorded 2000-09-22 — Reel 011409/0173
  • Conveyance: Assignment
  • Assignor: HARVEY, JOHN C., CUDDIHY, JAMES W.
  • Assignee: PERSONALIZED MEDIA COMMUNICATIONS, L.L.C.
  • Correspondent: JOHN M. CALIMAFDE, ESQ., HOPGOOD, CALIMAFDE, KALIL & JUDLOWE, LLP, 60 East 42nd Street, New York, New York 10165
  • Context: Transfer from inventors to original assignee.
• 2025-06-09 (executed) / recorded 2025-06-09 — Reel 063533/0111
  • Conveyance: Assignment
  • Assignor: PERSONALIZED MEDIA COMMUNICATIONS, LLC
  • Assignee: CONTENTNEXUS LLC
  • Correspondent: Matthew Miller, MILLER PRESTON LLC, 1941 STREETMAN RD, SANDY HOOK, VA 23153
  • Context: Transfer to new assignee.

Timeline diagram

timeline
    title Ownership of US 7817208
    1995 : Filed by Personalized Media
    2000 : Assigned to Personalized Media
    2010 : Issued
    2025 : Assigned to Contentnexus LLC

NPE / troll-pattern signals

1. Shell-entity transfer — Present. The transfer on 2025-06-09 (Reel 063533/0111) is from "PERSONALIZED MEDIA COMMUNICATIONS, LLC" to "CONTENTNEXUS LLC". The assignee name "Contentnexus LLC" with "LLC" suffix, and the fact that its primary business and products are not immediately evident, suggests it may be a licensing-only entity.
2. Known asserter in the chain — Not present. While Contentnexus LLC is the current assignee, it is not listed as a known high-frequency plaintiff or NPE on common public directories like RPX or Unified Patents within the provided information.
3. Repeat correspondent across the chain — Not present. The correspondent for the 2000-09-22 assignment (Reel 011409/0173) is John M. Calimafde, Esq. of Hopgood, Calimafde, Kalil & Judlowe, LLP. The correspondent for the 2025-06-09 assignment (Reel 063533/0111) is Matthew Miller of Miller Preston LLC. These are different individuals and firms.
4. Cascading transfers — Not present. There are only two assignments recorded, with a significant time gap between them.
5. Pre-litigation transfer — Unclear. The patent was assigned to Contentnexus LLC on 2025-06-09 (Reel 063533/0111). Without specific litigation filing dates, it is not possible to determine if this transfer occurred within 6 months prior to any infringement suits. However, the legal status indicates "Family has litigation," with a US case filed in Texas Eastern District Court (case 2:26-cv-00322). The transfer predates this known litigation.
6. Bankruptcy fire-sale — Not present. No information suggests either Personalized Media Communications LLC or Contentnexus LLC has filed for bankruptcy.
7. Privateering — Unclear. There is no available information to suggest a privateering arrangement.
8. Defensive aggregator (anti-NPE) — Not present. The current assignee, Contentnexus LLC, is not a known defensive aggregator.

Verdict

NPE — moderate confidence. The transfer from Personalized Media Communications LLC to Contentnexus LLC on 2025-06-09 (Reel 063533/0111) exhibits a shell-entity pattern with the assignee name "Contentnexus LLC". While Contentnexus LLC is not a publicly listed "known asserter," the pattern of an assignee with an LLC suffix, particularly when coupled with subsequent litigation (case 2:26-cv-00322), suggests a potential assertion strategy.

USPTO Assignment Center search for US7817208

As a technical patent analyst, I will now identify the most relevant prior art for US Patent 7817208 by examining its patent citations. I will provide the full citation, publication/filing date, a brief description, and which claim(s) it potentially anticipates under 35 U.S.C. § 102.

First, I need to access the full patent document for US7817208 from the USPTO database to review its cited prior art.

USPTO Search for US Patent 7817208:

A search for "US patent 7817208" on the USPTO website (which can be accessed via https://www.uspto.gov/patents/search or through tools like Justia Patents) will provide the full patent text and its cited references.

Most Relevant Prior Art for US Patent 7817208:

Based on the provided patent text, the following prior art references are explicitly discussed and described as having limitations that the current invention aims to overcome. This makes them highly relevant for an anticipation analysis under 35 U.S.C. § 102.

Here's an analysis of the prior art mentioned in the patent:

1. U.S. Pat. No. 4,381,522 to Lambert

   • Full Citation: U.S. Pat. No. 4,381,522 (Lambert)
   • Publication Date: The patent text does not explicitly state the publication date for Lambert, but as a cited patent, it would have predated the filing date of US7817208 (1995-06-07).
   • Brief Description: Describes a cable television system controlled by a minicomputer that responds to signals transmitted from viewers via telephone. The computer generates a schedule for pre-recorded "local origination programs" based on viewer input and transmits this schedule as a video image. It then actuates video players to transmit the requested programming.
   • Potential Anticipation (35 U.S.C. § 102): The patent itself states that Lambert "has no capacity to schedule automatically or transmit any programming other than that loaded immediately at the play heads of the controlled video players. It has no capacity to load the video players or identify what programming is loaded on the players or verify that scheduled programs are played correctly. It has no capacity to cause the video players to record programming from any source. It has no capacity to receive programming transmissions or process received transmissions in any way. It has no capacity to operate under the control of instructions transmitted by broadcasters. It has no capacity to insert signals that convey information to or control, in any way, the automatic operation of ultimate receiver station apparatus other than television receivers." Given these described limitations, Lambert would likely not anticipate claims 1 or 54 of US7817208, as those claims specifically address the ability to embed control signals, control diverse apparatus, and process programming in ways not described by Lambert. Specifically, Claim 1's features of detecting embedded control signals for controlling diverse apparatus and recording monitoring information, and Claim 54's features of controlling intermediate and ultimate receiver stations with embedded signals, appear to distinguish from Lambert's system.

2. U.S. Pat. No. 4,337,480 to Bourassin et al.

   • Full Citation: U.S. Pat. No. 4,337,480 (Bourassin et al.)
   • Publication Date: The patent text does not explicitly state the publication date for Bourassin et al., but as a cited patent, it would have predated the filing date of US7817208 (1995-06-07).
   • Brief Description: Describes a dynamic interconnection system for connecting a television receiver to multiple television peripheral units. It allows a viewer to automatically connect and disconnect peripherals and superimpose a secondary image (image-within-image) from a second peripheral unit onto the primary image.
   • Potential Anticipation (35 U.S.C. § 102): The patent does not explicitly state the limitations of Bourassin et al. directly in relation to anticipation of the broader system claims of US7817208. However, the description of "image-within-image" and connecting peripherals suggests a more limited scope than the comprehensive control and data processing described in Claims 1 and 54 of US7817208. The core elements of embedded control signals to orchestrate diverse operations, generate user-specific content, and manage reporting (as found in Claims 1 and 54) are not described as being present in Bourassin et al.

3. U.S. Pat. No. 4,264,925 to Freeman et al.

   • Full Citation: U.S. Pat. No. 4,264,925 (Freeman et al.)
   • Publication Date: The patent text does not explicitly state the publication date for Freeman et al., but as a cited patent, it would have predated the filing date of US7817208 (1995-06-07).
   • Brief Description: Describes a multi-channel programming transmission system where subscribers manually select among related programming alternatives transmitted simultaneously on separate channels.
   • Potential Anticipation (35 U.S.C. § 102): The patent states that Freeman et al. "has no capacity for interconnecting or operating a system at any time other than the time when the order to do so is entered manually at the system or remote keyboard. It has no capacity for acting on instructions transmitted by broadcasters to interconnect, actuate or tune systems peripheral to a television receiver or to actuate a television receiver or automatically change channels received by a receiver. It has no capacity for coordinating the programming content transmitted by any given peripheral system with any other programming transmitted to a television receiver. It has no capacity for controlling two separate systems such as, for example, an automatic radio and television stereo simulcast. It has no capacity for selectively connecting radio receivers to radio peripherals such as computers or printers or speakers or for connecting computers to computer peripherals (except perhaps a television set)." These limitations clearly indicate that Freeman et al. would not anticipate either Claim 1 or Claim 54, as both claims hinge on the automatic control of diverse apparatus via embedded control signals transmitted by broadcasters, which is explicitly absent in Freeman et al.

4. U.S. Pat. No. 4,025,851 to Haselwood et al.

   • Full Citation: U.S. Pat. No. 4,025,851 (Haselwood et al.)
   • Publication Date: The patent text does not explicitly state the publication date for Haselwood et al., but as a cited patent, it would have predated the filing date of US7817208 (1995-06-07).
   • Brief Description: Describes one system for monitoring programming by means of embedded digital signals, in the context of generating "ratings."
   • Potential Anticipation (35 U.S.C. § 102): The patent groups Haselwood et al. with other monitoring systems (Crosby and Greenberg) and states that "This prior art too, is limited. It has capacity to monitor only single broadcast stations, channels or units and lacks capacity to monitor more than one channel at a time or to monitor the combining of media. At any given monitor station, it has had capacity to monitor either what is transmitted over one or more channels or what is received on one or more receivers but not both. It has assumed monitored signals of particular format in particular transmission locations and has lacked capacity to vary formats or locations or to distinguish and act on the absence of signals or to interpret and process in any fashion signals that appear in monitored locations that are not monitored signals. It has lacked capacity to identify encrypted signals then decrypt them. It has lacked capacity to record and also transfer information to a remote geographic location simultaneously." While Haselwood et al. uses embedded digital signals for monitoring, its limitations regarding single-channel monitoring, lack of varied formats, and inability to decrypt or transfer information remotely concurrently suggest it would not anticipate the comprehensive control, processing, and multi-channel capabilities of Claims 1 and 54 of US7817208.

5. U.S. Pat. No. 3,845,391 to Crosby

   • Full Citation: U.S. Pat. No. 3,845,391 (Crosby)
   • Publication Date: The patent text does not explicitly state the publication date for Crosby, but as a cited patent, it would have predated the filing date of US7817208 (1995-06-07).
   • Brief Description: Describes a system that monitors programming by means of audio codes that are "substantially inaudible."
   • Potential Anticipation (35 U.S.C. § 102): Similar to Haselwood et al., Crosby's limitations are described as encompassing the inability to monitor multiple channels, combine media, identify/decrypt encrypted signals, or simultaneously record and transfer information to a remote location. Therefore, Crosby would likely not anticipate Claims 1 or 54 due to these significant differences in functionality.

6. U.S. Pat. No. 4,547,804 to Greenberg

   • Full Citation: U.S. Pat. No. 4,547,804 (Greenberg)
   • Publication Date: The patent text does not explicitly state the publication date for Greenberg, but as a cited patent, it would have predated the filing date of US7817208 (1995-06-07).
   • Brief Description: Describes a system that automatically monitors multiple channels by switching sequentially among them and includes capacity to monitor audio and visual quality. It uses a digital signal transmitted at a particular place on a select line of each frame of a television program.
   • Potential Anticipation (35 U.S.C. § 102): Greenberg is also included in the group of monitoring systems with the limitations noted for Haselwood et al. and Crosby. Although it mentions monitoring multiple channels by sequentially switching, it still lacks the comprehensive control, diverse apparatus interaction, generation of user-specific content, and advanced data processing features central to Claims 1 and 54 of US7817208. The patent explicitly notes that Greenberg's signals "serve only one function," which contrasts sharply with the multifaceted control signals of the present invention.

Conclusion on Prior Art:

The patent US7817208 explicitly delineates the limitations of these cited prior art references. The key distinctions claimed by US7817208 revolve around the ability to:

• Embed complex control instructions (not just identification signals) that can orchestrate diverse apparatus at subscriber stations.
• Achieve automatic and synchronized operation of various devices (computers, VCRs, etc.) based on these embedded signals.
• Enable the generation of user-specific programming at subscriber stations and its combination with broadcast content.
• Provide a unified system for controlling and monitoring across intermediate and ultimate receiver stations, including decryption and selective output.
• Handle variable signal formats and process complex data streams.

Therefore, none of the prior art explicitly discussed in the patent text appears to fully anticipate the independent claims of US7817208 under 35 U.S.C. § 102 based on the patent's own description of their limitations. They may, however, represent individual elements or concepts that are combined or improved upon in US7817208. A definitive determination would require a more detailed claim-by-claim analysis against the full specifications of each cited patent.

To analyze the obviousness of US patent 7817208 under 35 U.S.C. § 103, we must determine if the differences between the claimed invention and the prior art would have been obvious to a person having ordinary skill in the art (POSITA) at the time the invention was made. The filing date of the claimed invention is June 7, 1995, with a priority date of November 3, 1981. We'll use the earlier priority date as the relevant time for obviousness assessment.

A POSITA in the field of "Signal processing apparatus and methods" at that time (1981) would likely possess a strong understanding of electronics, computer science fundamentals, broadcast communication techniques (television and radio), and early forms of data transmission and processing. This would include knowledge of microprocessors, memory systems (ROM, RAM, EPROM), digital signal processing, networking concepts (even if rudimentary by today's standards), and basic encryption/decryption methods. They would also be familiar with the limitations of existing systems for interactive television, data broadcasting, and audience monitoring.

The analysis of obviousness involves considering:

1. The scope and content of the prior art.
2. The differences between the prior art and the claims at issue.
3. The level of ordinary skill in the pertinent art.
4. Secondary considerations of non-obviousness (though these are not presented here).

Combinations of Prior Art References and Motivation to Combine

Let's examine the prior art cited within US7817208 and consider how a POSITA in 1981 might have combined them to arrive at the claimed invention.

Independent Claim 1: System for processing broadcast programming at a subscriber station.

• Key elements of Claim 1: Receiving broadcast signals with embedded control signals; detecting/converting these signals; controlling various subscriber apparatus (computers, VCRs, etc.) based on these signals, including synchronization with broadcast content; generating user-specific information; recording monitoring information; and having a programmable controller for modification, decryption, and recording usage data.

• Prior Art References and their relevance:

  • Dataspeed Corporation (Lotus Development Corporation) and Equatorial Communications Company: These references describe systems for transmitting real-time financial data over radio frequencies or satellite to microcomputers equipped with "modios" (radio receivers, modems, and decryptors). Subscribers program their apparatus to select data of interest.

    • Relevance: Establishes the concept of point-to-multipoint data transmission, reception by microcomputers, and decryption. It also shows user selection of data.
    • Limitations noted in patent: "It only transmits data; it does not control data processing. No system is preprogrammed to simultaneously control a plurality of central processor units, operating systems, and pluralities of computer peripheral units. None has capacity to cause simultaneous generation of user specific information at a plurality of receiver stations. None has any capacity to cause subscriber station computers to process received data, let alone in ways that are not inputted by the subscribers."

  • U.S. Pat. No. 4,381,522 to Lambert: Describes a cable television system controlled by a minicomputer that responds to viewer signals (by telephone) to generate a schedule of prerecorded programs and transmit them.

    • Relevance: Shows computerized control of television programming, scheduling, and viewer interaction (though via telephone, not embedded signals).
    • Limitations noted in patent: "It has no capacity to schedule automatically or transmit any programming other than that loaded immediately at the play heads of the controlled video players. It has no capacity to load the video players or identify what programming is loaded on the players or verify that scheduled programs are played correctly. It has no capacity to cause the video players to record programming from any source. It has no capacity to receive programming transmissions or process received transmissions in any way. It has no capacity to operate under the control of instructions transmitted by broadcasters."

  • U.S. Pat. No. 4,337,480 to Bourassin et al.: Describes a dynamic interconnection system for connecting a television receiver to multiple peripheral units, allowing for "image-within-image" superposition of secondary images.

    • Relevance: Demonstrates the ability to connect and automatically switch between TV peripheral units and overlay images.

  • U.S. Pat. No. 4,264,925 to Freeman et al.: Describes a multi-channel programming transmission system where subscribers manually select among related programming alternatives.

    • Relevance: Shows multi-channel programming selection by subscribers.
    • Limitations noted in patent: "It has no capacity for interconnecting or operating a system at any time other than the time when the order to do so is entered manually at the system or remote keyboard. It has no capacity for acting on instructions transmitted by broadcasters to interconnect, actuate or tune systems peripheral to a television receiver or to actuate a television receiver or automatically change channels received by a receiver."

  • U.S. Pat. No. 4,025,851 to Haselwood, et al., U.S. Pat. No. 3,845,391 to Crosby, and U.S. Pat. No. 4,547,804 to Greenberg: These patents describe systems for monitoring programming and generating ratings, often using embedded digital or audio signals.

    • Relevance: Establishes the use of embedded signals for monitoring and identification within broadcast transmissions. Greenberg specifically mentions digital signals on a video line.
    • Limitations noted in patent (collectively): "It has capacity to monitor only single broadcast stations, channels or units and lacks capacity to monitor more than one channel at a time or to monitor the combining of media... It has assumed monitored signals of particular format in particular transmission locations and and has lacked capacity to vary formats or locations or to distinguish and act on the absence of signals or to interpret and process in any fashion signals that appear in monitored locations that are not monitored signals. It has lacked capacity to identify encrypted signals then decrypt them."

  • Video tape recorders (VCRs): Acknowledged as having capacity for automatic delayed recording based on manual input.

    • Relevance: Shows existing recording capability at the subscriber end.

  • "Interactive video" systems: Acknowledged for locating prerecorded TV programming and digital data on a disc and transmitting them to TVs and computers.

    • Relevance: Demonstrates combining video and digital data for different output devices.

  • "Addressable" systems: Acknowledged for controlling specific individual subscriber station apparatus via broadcast control instructions (e.g., turning on/off decoder/decryptor apparatus).

    • Relevance: Shows broadcast transmission of control instructions to individual subscriber units.

• Obviousness Argument for Claim 1:
  A POSITA in 1981, aiming to create a more integrated and automated interactive media experience, would have been motivated to combine the elements from the various prior art systems.

  1. Combining Embedded Signals with Processing and Control: The Dataspeed/Equatorial systems already demonstrated receiving data and decrypting it at a microcomputer, while Haselwood, Crosby, and Greenberg showed embedding signals for monitoring. "Addressable" systems further taught using broadcast signals to control subscriber equipment (like decoders). A POSITA would find it obvious to extend the concept of embedded signals from mere monitoring (Greenberg) or basic on/off control ("addressable" systems) to carrying more complex control instructions that could influence the processing of data at a subscriber's microcomputer (Dataspeed/Equatorial). The motivation would be to automate tasks that were previously manual or limited, making the system more "user-friendly" and efficient, as the patent itself notes as an advantage.

  2. Synchronized Generation and Display of User-Specific Information: The Dataspeed/Equatorial systems allowed users to select data of interest, but without broadcast control over processing or synchronized display. Bourassin et al. showed image overlay. Given the desire for more sophisticated interactive experiences, a POSITA would be motivated to combine the data processing capability of microcomputers (Dataspeed/Equatorial) with the overlay techniques (Bourassin et al.) and control signals (Greenberg, "addressable" systems) to enable the broadcast station to trigger the generation and synchronized display of user-specific graphics, such as a personalized stock portfolio (as in the patent's example), overlaid onto a relevant broadcast image. This would address the limitation of prior art that could not cause simultaneous generation of user-specific information at a plurality of receiver stations or cause subscriber computers to process data in ways not inputted by subscribers.

  3. Recording and Data Management: VCRs were known for delayed recording based on manual input. The monitoring systems (Haselwood, Crosby, Greenberg) collected usage data. A POSITA would find it obvious to integrate the control capabilities (from "addressable" systems and the proposed advanced embedded signals) with the recording capabilities of VCRs and the data collection aspects of monitoring systems. The motivation would be to automate the recording of programming based on broadcast instructions, and concurrently, to automatically record detailed monitoring information about program usage or system actions, then transmit this data back (perhaps via a modem, as used in Dataspeed/Equatorial for receiving, or a telephone dialer mentioned in the patent's signal processor description). This would overcome the limitations of prior art VCRs that required manual input and lacked the ability to embed/remove signals or retransmit decrypted programming based on embedded keys.

  4. Programmable Control: The concept of programmable controllers and microprocessors was well-established (e.g., in the microcomputers of Dataspeed/Equatorial, Lambert's minicomputer). The patent explicitly mentions a "PRAM controller" that permits revision of operating patterns and instructions and EPROM for reprogrammability. Given the varying requirements and the need for system updates, it would be obvious for a POSITA to incorporate programmable memory (EPROM, RAM) and a controller into any sophisticated signal processing unit to allow for remote updates and flexible operation, building on the basic programmable nature of computers already known in the prior art.

Independent Claim 54: Method for processing and distributing broadcast programming at an intermediate transmission station.

• Key elements of Claim 54: Receiving broadcast programming with embedded digital control signals; extracting/processing these signals to control equipment at the intermediate station (e.g., generate additional content, modify broadcast); retransmitting the programming, potentially with new/modified embedded signals; and gathering monitoring information.

• Prior Art References and their relevance:

  • Lambert (U.S. Pat. No. 4,381,522): Describes a minicomputer at a cable headend (intermediate station) controlling program scheduling and transmission based on viewer input.

    • Relevance: Clearly demonstrates computerized control at an intermediate transmission station.
    • Limitations noted in patent: Limited to scheduling and playing prerecorded programs, no capacity to operate under control of instructions from broadcasters or to insert signals for ultimate receiver stations.

  • Haselwood, Crosby, Greenberg (monitoring systems): Show embedding signals in programming for identification and monitoring.

    • Relevance: Teaches the technical means of embedding signals in broadcast streams.

  • "Addressable" systems: Demonstrate control instructions transmitted in broadcasts to control subscriber apparatus.

    • Relevance: Shows the concept of a central entity sending control instructions to many remote units.

  • Dataspeed/Equatorial (data transmission to microcomputers): Shows a point-to-multipoint transmission of data to many receivers.

    • Relevance: Confirms the widespread distribution of information from a central source to many end-points.

• Obviousness Argument for Claim 54:
  A POSITA in 1981, seeking to enhance the capabilities of intermediate broadcast stations (like cable headends or local affiliates) beyond simple retransmission or basic scheduling, would have been motivated to combine existing technologies to achieve greater control and interactivity.

  1. Centralized Control via Embedded Signals: Lambert already showed local computer control at a headend for scheduling. The monitoring patents (Haselwood, Crosby, Greenberg) showed how to embed signals. "Addressable" systems showed how a central broadcaster could send control instructions. A POSITA would find it obvious to combine these by having the originating broadcaster embed control signals (as in Haselwood/Crosby/Greenberg for monitoring, or "addressable" systems for basic control) that could be detected and processed at an intermediate station (like Lambert's minicomputer). The motivation would be to allow the originating content provider to exert more granular control over how their programming is handled and retransmitted by intermediate stations, overcoming Lambert's limitation of not operating under instructions from broadcasters.

  2. Processing and Modifying at the Intermediate Station: Given the concept of receiving and interpreting embedded control signals at an intermediate station, a POSITA would be motivated to enable that station's equipment to act upon those signals. This could involve, for instance, generating additional localized content (e.g., local advertisements or information, analogous to Lambert's local origination programming) or modifying the received broadcast (e.g., inserting specific instructions for subscriber stations). The motivation would be to create a more flexible and dynamic content delivery system, allowing for regional customization or the insertion of specific triggers for downstream subscriber devices. The ability of the ultimate receiver to combine studio and user-specific graphics, as described in the patent, inherently implies that intermediate stations could be involved in handling or even generating components of these combined media.

  3. Retransmission with Embedded/Modified Signals and Monitoring: Building on the previous points, once an intermediate station processes the original embedded signals and potentially generates new content, it would be obvious for a POSITA to re-embed or modify the control signals in the retransmitted programming. This would ensure that the control flow extends to the ultimate receiver stations. Furthermore, given the existing monitoring systems (Haselwood, Crosby, Greenberg), it would be obvious to integrate monitoring capabilities at the intermediate station to gather data on what programming is transmitted and how it's modified or supplemented, and potentially how it is intended for use at subscriber stations. This addresses the limitation of earlier monitoring systems that only monitored single channels or lacked capacity for combining media.

In summary, the advancements claimed in US7817208, while novel in their specific combination and detailed implementation, appear to a POSITA in 1981 as a logical progression and combination of existing broadcast, data transmission, computer processing, and monitoring technologies. The motivation would stem from the desire to create more interactive, personalized, and centrally controlled media experiences, and to overcome the known limitations of discrete prior art systems.