Obviousness

Obviousness Analysis of US Patent 10,129,627

An analysis of US Patent 10,129,627, titled "Wireless digital audio music system," and its cited prior art indicates that the patent's claims would have been considered obvious to a person of ordinary skill in the art at the time of invention, pursuant to 35 U.S.C. § 103. The claims of the '627 patent are rendered obvious by a combination of prior art references that disclose the key elements of the invention, with a clear motivation for their combination.

The independent claims of the '627 patent generally describe a wireless digital audio spread spectrum receiver and transmitter system. Key features of this system include the use of a unique user code for communication, the transmission of a high-quality audio signal (20 Hz to 20 kHz), the use of spread spectrum communication (specifically including Differential Phase Shift Keying - DPSK), and independent code division multiple access (CDMA) to prevent interference between users.

A compelling case for obviousness can be constructed by combining the teachings of U.S. Patent No. 5,771,441 to Altstatt (hereinafter "Altstatt"), U.S. Patent No. 5,946,343 to Schotz et al. (hereinafter "Schotz"), and general knowledge in the field of digital communications at the time.

Breakdown of Prior Art and Motivation to Combine:

• Altstatt (US 5,771,441): This patent discloses a small, battery-operated RF transmitter that connects to the headphone jack of a portable audio device and wirelessly transmits the audio signal to headphones with an RF receiver. This directly teaches the fundamental concept of the '627 patent: a wireless audio system for portable devices. Altstatt's system, however, is primarily analog (FM transmission).

• Schotz (US 5,946,343): This patent describes a digital wireless speaker system that utilizes spread spectrum communication to transmit high-quality digital audio. Schotz explicitly addresses the problem of interference in the crowded radio spectrum and teaches the use of digital transmission and spread spectrum techniques to overcome this. The patent details the conversion of an analog audio signal to a digital format, processing it, and transmitting it wirelessly.

• General Knowledge of Digital Communication Techniques: At the time of the invention of the '627 patent (priority date of December 21, 2001), digital communication techniques such as Code Division Multiple Access (CDMA) and various modulation schemes like Differential Phase Shift Keying (DPSK) were well-established and widely used in the telecommunications industry. CDMA was known for its ability to allow multiple users to share the same frequency band with minimal interference by assigning unique codes to each user. DPSK was a known and implemented digital modulation technique.

The Motivation to Combine these references would have been readily apparent to a person of ordinary skill in the art:

A skilled artisan, starting with the portable wireless headphone system taught by Altstatt, would recognize the limitations of its analog FM transmission, particularly its susceptibility to noise and interference. To improve upon Altstatt's system and create a more robust and higher-fidelity wireless audio experience, this artisan would naturally look to the field of digital wireless audio transmission.

Schotz provides a direct solution to the interference and quality issues inherent in Altstatt's analog approach. Schotz teaches the advantages of digital spread spectrum communication for audio signals. A person of ordinary skill would have been motivated to replace the analog FM transmitter and receiver in Altstatt's system with the digital spread spectrum transmitter and receiver architecture described by Schotz. This combination would be a predictable solution to a known problem: improving the signal quality and reducing interference in a wireless headphone system.

Furthermore, to address the issue of multiple users in the same environment, which is a key aspect of the '627 patent, the skilled artisan would have been motivated to incorporate known multi-user communication techniques. The use of Code Division Multiple Access (CDMA), a widely understood technology at the time, would be an obvious choice to allow for private listening without interference from other nearby users, as claimed in the '627 patent. The concept of assigning a "unique user code," as claimed in the '627 patent, is the fundamental principle of CDMA.

The inclusion of Differential Phase Shift Keying (DPSK) as a modulation technique, as specified in the '627 patent claims, would also have been an obvious design choice for a digital communication system. DPSK was a known and implemented modulation scheme, and its selection would fall within the routine design considerations of a communications engineer.

In conclusion, the combination of Altstatt's portable wireless headphone concept with Schotz's digital spread spectrum audio transmission system, further enhanced with the well-known principles of CDMA for multi-user access and DPSK for digital modulation, would have rendered the claims of US Patent 10,129,627 obvious to a person of ordinary skill in the art. The motivation to combine these elements stems from the desire to improve upon existing technology by addressing known limitations with established and predictable solutions.