Disclosed herein are child monitor systems and methods in which a device includes a receiver that receives a wireless signal including audio data indicative of sounds captured at a remote location. The receiver includes a demodulator to derive a digital data stream from the wireless signal. The device further includes a processor coupled to the receiver to obtain the digital data stream and configured to analyze the digital data stream to determine whether to initiate a vibration alert. In some cases, a transmitter device includes a processor configured to generate a vibration alert command based on an analysis of the digital audio data and for incorporation in the wireless signal.