Resmed Limited

Lucent Technologies Inc.

Luke Anthony Tucker

Chinmayee Somaiya

Wendall Eric Trull

Christopher John Roberts

Amila Jeewaka Fernando

Brian Hickey

Mark Greig Wildie

Brain Hickey

Methods and apparatus provide communications among respiratory therapy device ('TD'), server and intermediary (e.g., a control device (“CTLD”) for the therapy device) to improve security. More secure communication channel(s) may be established using shared secrets derived with different channels. The communications may include transmitting therapy data from TD to server for authentication. The CTLD may receive the data and a nonce from a server. The CTLD receives from the TD a signing key dependent on the nonce and a secret shared by TD and server. The CTLD generates an authorisation code with received therapy data and the key for authentication of the data by the server upon its receipt of the code and data. The server computes (1) a key from the nonce and the secret known to TD, and (2) another authorisation code from received therapy data and the key. Data authentication may involve comparing received and computed codes.

Secure networked respiratory therapy systems

Methods and apparatus provide communications among respiratory therapy device ('TD'), server and intermediary (e.g., a control device ('CTLD') for the therapy device) to improve security. More secure communication channel(s) may be established using shared secrets derived with different channels. The communications may include transmitting therapy data from TD to server for authentication. The CTLD may receive the data and a nonce from a server. The CTLD receives from the TD a signing key dependent on the nonce and a secret shared by TD and server. The CTLD generates an authorisation code with received therapy data and the key for authentication of the data by the server upon its receipt of the code and data. The server computes (1) a key from the nonce and the secret known to TD, and (2) another authorisation code from received therapy data and the key. Data authentication may involve comparing received and computed codes.

A double-talk detector ( ) for an acoustic echo canceler ( ) of a VoIP terminal ( ) converts ( ) received far-end signals ( ) and transmitted near-end signals ( ) into the frequency domain and high-pass filters out ( ) low-frequencies representing noise to obtain a complex reference signal and a complex error signal, respectively. It then correlates ( ) the complex signals and computes ( ) the instantaneous error energy ( ) and smoothed (long-term average) error energy ( ) of the complex error signal. If the convergence value is below 0.06 ( ), the signals are converged and double-talk detection is enabled ( ). If the convergence value is above 0.09 ( ), the signals are diverged and double-talk detection is disabled ( ). If double-talk detection is not enabled, an error threshold ( ) is set ( ) to the value of the smoothed error energy. If double-talk detection is enabled ( ), presence of double-talk is indicated ( ) if the instantaneous error energy value exceeds ( ) the error threshold, and absence of double-talk is indicated ( ) if the instantaneous error energy value does not exceed ( ) the error threshold.

Double-talk detector suitable for a telephone-enabled PC

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Sydney, Australia

Luke Anthony Tucker