Abstract: A MIDI data transmitter/receiver for a MIDI instrument device which delivers MIDI data for transmitting performance information received/transmits a radio signal modulated by the MIDI data by a transmitter/receiver block connected to the MIDI instrument. The MIDI data transmitter/receiver includes a lock-type setting switch for setting initial operating conditions of the transmitter/receiver block. The control block controls the transmitter/receiver block based on the initial operating conditions set by the lock-type setting switch, when the power is turned on. In another form of the invention, data indicative of operating conditions set by the control block is stored in an electrically rewritable memory, and the control block controls the transmitter/receiver block based on the initial operating conditions set based on data of newest operating conditions stored in the memory, when the power is turned on. Other forms of the invention are also provided.

Abstract: A MIDI transmitter receives a MIDI signal from a MIDI instrument device connected thereto, modulates the MIDI signal into a radio signal, and transmits the radio signal. A MIDI receiver receives a radio signal prepared based on a MIDI signal, from a MIDI instrument device separate therefrom, demodulates the radio signal into the MIDI signal, and delivers the resulting MIDI signal to another MIDI instrument device connected thereto. A MIDI signal transmitter/receiver includes a transmitter block for receiving and modulating a MIDI signal from a MIDI instrument device connected thereto into a radio signal and transmitting the radio signal, a receiver block for receiving and demodulating a radio signal prepared based on a MIDI signal from the MIDI instrument device separate therefrom, and delivering the resulting signal to a MIDI instrument device connected thereto, and a reception/transmission changeover block for selectively permitting one of the transmitter block and the receiver block to operate.