Methods and devices with leak detection

A leak detection apparatus comprising:

• a controller having at least one processor to access data representing a measured flow of breathable gas measured with a sensor, the flow of breathable gas provided with a respiratory pressure treatment apparatus, the controller being further configured to:
• determine a ventilation measure and a leak measure from the measured flow;
• analyze a covariance signal from the ventilation measure and the leak measure to detect a contemporaneous change comprising a change in the ventilation measure contemporaneous with a change in the leak measure;
• identify a continuous mouth leak event based on the contemporaneous change;
• and
• control a respiratory therapy provided with the flow of breathable gas generated by the respiratory pressure treatment apparatus based on the covariance signal.

A processor-readable medium, having stored thereon processor-executable instructions which, when executed by a processor, cause the processor to detect leak from a flow of breathable gas within a respiratory pressure treatment apparatus, the processor-executable instructions comprising:

• instructions to measure the flow using a sensor;
• instructions to determine a ventilation measure and a leak measure from the measured flow;
• instructions to analyze the ventilation measure and the leak measure to detect a contemporaneous change comprising a change in the ventilation measure contemporaneous with a change in the leak measure;
• and
• instructions to identify a leak event based on the contemporaneous change.