Patent ID: 9736584
Date: 2017-08-15
CPC Classifications: G06F,H03G,H04R,H04S

Claim:
1. A playback device comprising: one or more speakers; a network interface; one or more processors; a data storage having stored therein instructions executable by the one or more processors to cause the playback device to perform operations comprising: receiving, from a control device via the network interface, a command that instructs the playback device to emit a calibration sound; and in response to the received command, causing the one or more speakers to emit a periodic calibration sound that covers a calibration frequency range, wherein the periodic calibration sound comprises (i) a first component that includes noise at frequencies between a minimum of the calibration frequency range and a first threshold frequency, and (ii) a second component that sweeps through frequencies between a second threshold frequency and a maximum of the calibration frequency range.