Patent ID: 8346508

Claim:
A diagnostic system for a home appliance, comprising: at least one home appliance that outputs a sound signal including product information; and a diagnostic server that receives the sound signal from the home appliance and diagnoses a faulty operation of the home appliance using the received sound signal, wherein the diagnostic server extracts a plurality of preamble candidates from the sound signal, detects a preamble for identifying the product information from the plurality of preamble candidates, extracts product information contained in the sound signal, and thus diagnoses a current status of the home appliance, a faulty operation, and a cause of the faulty operation, wherein the diagnostic server includes: a signal detector that performs matching and weighting processes between the plurality of preamble candidates so as to detect the preamble from the plurality of preamble candidates, and extracts the product information using the preamble; and a diagnostic device that diagnoses a current status of the home appliance, a faulty operation, and a cause of the faulty operation by analyzing the product information, wherein the signal detector extracts a first plurality of preamble candidates of a first time to form a first preamble candidate group, extracts a second plurality of preamble candidates of a second time according to not only data including the product information but also a preamble size to form a second preamble candidate group, and matches each preamble candidate of the first preamble candidate group to each preamble candidate of the second preamble candidate group on a one to one basis.