Described are systems, methods, apparatuses, and computer program products for wireless in-ear-monitoring (IEM) of audio. A system includes transmitter(s) configured to map orthogonal sub-carriers of a digital signal to narrowband receivers to form receiver-allocated audio channels, modulate the digital signal, and transmit the signal as an ultra-high frequency (UHF) analog carrier wave comprising the orthogonal sub-carriers to the nearby receiver. A narrowband receiver is configured to demodulate and sample the sub-carriers allocated to the receiver. Sub-carriers can be positioned orthogonal to one another in adjacent sub-bands of the frequency domain and beacon symbols and pilot signals can be iteratively provided in the same portion of the frequency domain for each channel. The receiver can use non-data-aided and data-aided approaches for synchronization of the time domain and frequency domain waveforms of the received signal to the transmitted signal prior to sampling the allocated sub-carriers.

A communication device for an electronic musical instrument includes a battery; an input terminal that is connected to a MIDI output terminal of the electronic musical instrument; an output terminal that is connected to a MIDI input terminal of the electronic musical instrument; a control unit that transmits and receives various kinds of electronic information between the electronic musical instrument and the other electronic instrument via the input terminal and the output terminal; and a switching unit that switches between taking in electric power to be supplied to the control unit through a MIDI signal line from the electronic musical instrument via the input terminal and taking in the electric power from the battery in accordance with a communication state of the control unit.

Described are systems, methods, apparatuses, and computer program products for wireless in-ear-monitoring (IEM) of audio. A system includes transmitter(s) configured to map orthogonal sub-carriers of a digital signal to narrowband receivers to form receiver-allocated audio channels, modulate the digital signal, and transmit the signal as an ultra-high frequency (UHF) analog carrier wave comprising the orthogonal sub-carriers to the nearby receiver. A narrowband receiver is configured to demodulate and sample the sub-carriers allocated to the receiver. Sub-carriers can be positioned orthogonal to one another in adjacent sub-bands of the frequency domain and beacon symbols and pilot signals can be iteratively provided in the same portion of the frequency domain for each channel. The receiver can use non-data-aided and data-aided approaches for synchronization of the time domain and frequency domain waveforms of the received signal to the transmitted signal prior to sampling the allocated sub-carriers.

The disclosure provides a wireless communication device, an electronic device, and a wireless communication method. A wireless communication device is connected to an electronic musical instrument and transmits and receives MIDI data input to and output from the electronic musical instrument to and from other wireless communication devices paired through wireless communication at a predetermined communication interval, the pair is formed with each of a plurality of the other wireless communication devices. The wireless communication device includes a communication interval setting part configured to set a communication interval of each pair to a different time interval; and a communication interval transmission part configured to transmit the communication intervals set by the communication interval setting part to the corresponding other wireless communication devices.

A communication device for an electronic musical instrument includes a battery; an input terminal that is connected to a MIDI output terminal of the electronic musical instrument; an output terminal that is connected to a MIDI input terminal of the electronic musical instrument; a control unit that transmits and receives various kinds of electronic information between the electronic musical instrument and the other electronic instrument via the input terminal and the output terminal; and a switching unit that switches between taking in electric power to be supplied to the control unit through a MIDI signal line from the electronic musical instrument via the input terminal and taking in the electric power from the battery in accordance with a communication state of the control unit.

An information processing apparatus that stores a plurality of pieces of audio data, displays information corresponding to each of the plurality of pieces of audio data, receives an input selecting at least one of the plurality of pieces of audio data, reproduces a first piece of the plurality of pieces of audio data, and initiates simultaneous reproduction of a second piece of the plurality of pieces of audio data based on an input received at the interface, processes the first and second pieces of the audio data such that the first and second pieces of the audio data are separately audible by the user, and outputs the processed first and second pieces of the audio data.

Described are systems, methods, apparatuses, and computer program products for wireless in-ear-monitoring (IEM) of audio. A system includes transmitter(s) configured to map orthogonal sub-carriers of a digital signal to narrowband receivers to form receiver-allocated audio channels, modulate the digital signal, and transmit the signal as an ultra-high frequency (UHF) analog carrier wave comprising the orthogonal sub-carriers to the nearby receiver. A narrowband receiver is configured to demodulate and sample the sub-carriers allocated to the receiver. Sub-carriers can be positioned orthogonal to one another in adjacent sub-bands of the frequency domain and beacon symbols and pilot signals can be iteratively provided in the same portion of the frequency domain for each channel. The receiver can use non-data-aided and data-aided approaches for synchronization of the time domain and frequency domain waveforms of the received signal to the transmitted signal prior to sampling the allocated sub-carriers.