FIG. 5 is a functional block diagram showing an NMD 503 configured in accordance with embodiments of the disclosure. The NMD 503, for example, may be configured for use with the MPS 100 and may be in communication with any of the playback and/or network microphone devices described herein. As noted above, in some implementations an NMD may be standalone, while in other implementations be a playback device or a different device, such as smart household appliance (e.g., a smart washing machine, microwave, etc.). As shown in FIG. 5, The NMD 503 includes a voice processor 560, a wake-word engine 570, and at least one voice extractor 572, each of which is operably coupled to the voice processor 560. The NMD 503 may be NMD-equipped such that it includes the microphones 222 and the at least one network interface 224 described above. The NMD 503 may also include other components, such as audio amplifiers, etc., which are not shown in FIG. 5 for purposes of clarity.
The microphones 222 of the NMD 503 are configured to provide detected sound, SD, from the environment of the NMD 503 to the voice processor 560. The detected sound SD may take the form of one or more analog or digital signals. In example implementations, the detected sound SD may be composed of a plurality of signals associated with respective channels 562 that are fed to the voice processor 560. Each channel 562 may provide all or a portion of the detected sound SD to the voice processor 560.
