Abstract: A vehicle includes microphones and a system for detecting a lifeform in the vehicle, such as a pet or child left behind in a vehicle. Detecting the lifeform includes obtaining sound signals captured by the microphones and performing a spectral response analysis of the sound signals. The spectral response analysis is based on frequency-based attenuation of the vehicle. The lifeform detection system determines, based on the spectral response analysis, whether a source of a sound captured by at least one of the plurality of microphones is located inside the vehicle, and if it is, generates a notification in response to determining that the source of the sound is located inside the vehicle.

Abstract: In an example, a machine-implemented method for detecting voice activity may include receiving a digital representation of an audio signal. The method may also include applying a first stage which may include determining a first frequency-domain indicator from the digital representation of the audio signal to identify a candidate speech duration. The method may also include applying a second stage which may include determining at least one of a mel-frequency cepstral (MFC) indicator or a pitch indicator from the digital representation of the audio signal to assess whether the identified candidate speech duration contains speech.

Abstract: Existing synchronization methods can be inefficient in hardware-assisted implementations because of the effects of various jittery events. Thus, a method and an apparatus are provided to synchronize a slave device's clock to a master device's clock for a hardware-assisted implementation. The method can include the receipt of three messages. Time differences are determined based on a time extracted from two of the messages and a time of receipt of a different one of the messages. The slave device's clock can be adjusted based on these time differences. Thus, this method, which can include a dynamic weighted average to compute and implement the synchronization, can synchronize the clock of the slave device to the clock of the master device in a faster time interval.

Abstract: Existing synchronization methods can be inefficient in hardware-assisted implementations because of the effects of various jittery events. Thus, a method and an apparatus are provided to synchronize a slave device's clock to a master device's clock for a hardware-assisted implementation. The method can include the receipt of three messages. Time differences are determined based on a time extracted from two of the messages and a time of receipt of a different one of the messages. The slave device's clock can be adjusted based on these time differences. Thus, this method, which can include a dynamic weighted average to compute and implement the synchronization, can synchronize the clock of the slave device to the clock of the master device in a faster time interval.