Abstract: An audio signal source verification system is presented that, in certain embodiments, receives a first template for an audio signal and compares it to templates from different sound sources to determine a correlation between them. A question and response format may be used to eliminate false verifications and to increase the probability that an audio signal is from the purported source of the signal. Moreover mobile devices may be operated to provide audio signals generated by users of those phones and the audio signals and templates derived form those signals may be compared to known templates to determine a confidence level or other indication may be used to indicate the mobile device user is who they purport to be. Moreover comparisons can be made using templates of different richness to achieve confidence levels and confidence levels may be represented based on the results of the comparisons.

Abstract: An audio signal verification system is presented for verifying the sound is from a predetermined source. Various methods for analyzing the sound are presented and the various methods may be combined to vary degrees to determine an appropriate correlation with a predefined pattern. Moreover a confidence level or other indication may be used to indicate the determination was successful. The sound may be reduced to templates with varying degrees of richness. Also different templates may be created using the same sound source and different sounds from the same source may be aggregated to form a single template. Comparisons may be made comparing a sound or a template derived from that sound with stored sounds or templates derived from that stored sound. Moreover comparisons can be made using templates of different richness to achieve confidence levels and confidence levels may be represented based on the results of the comparisons.

Abstract: A system using sound templates is presented that may receive a first template for an audio signal and compares it to templates from different sound sources to determine a correlation between them. A location history database is created that assists in identifying the location of a user in response to audio templates generated by the user over time and at different locations. Comparisons can be made using templates of different richness to achieve confidence levels and confidence levels may be represented based on the results of the comparisons. Queries may be run against the database to track users by templates generated from their voice. In addition, background information may be filtered out of the voice signal and separately compared against the database to assist in identifying a location based on the background noise.

Abstract: The rapid removal of dissolved oxygen from aqueous solutions is accomplished by the use of a composition comprised of a mixture of an aqueous solution of hydrazine and a catalytic proportion of an aryl amine compound. The compositions of this invention are particularly useful in the removal of dissolved oxygen from aqueous solutions such as boiler water, thereby inhibiting corrosion of the metal surfaces of the boiler.

Abstract: The rapid removal of dissolved oxygen from aqueous solutions is accomplished by treating the solution with an effective proportion of a liquid organic hydrazine compound. The method of this invention is particularly useful in the removal of dissolved oxygen from aqueous solutions such as boiler water, thereby inhibiting corrosion of the metal surfaces of the boiler.