In
Claim 7 of the Google patent recites:
7. An electronic device, comprising:
an audio input configured to receive a received signal;
an audio output configured to output an output signal;
a transceiver configured to transmit a transmitted signal; and
an adaptive echo and noise control system coupled to the audio input,
the audio output, and the transceiver,
the adaptive echo and noise control system including
an echo canceller; and
a noise suppressor,
wherein the adaptive echo and noise control system is configured to
adaptively determine an order of echo cancellation and noise suppression based on an amount of noise in the received signal to generate a desired signal,
and wherein the adaptive echo and noise control system is further configured to send the desired signal to the transceiver.
On the basis of expert evidence, the Federal Court had found that "echo cancellation" was a distinct process from noise suppression and rejected Google's argument that echo cancellation was not limited to mechanisms using a reference signal and a cancellation point, but included other mechanisms that treated echo as noise.
The Federal Court also weighed conflicting expert evidence to determine that there would be no "order of echo cancellation and noise suppression" where only either echo cancellation or noise suppression was performed. Google argued that the term "an order" could encompass an order in which either process was available but not performed.
A copy of the decision is available here.
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