AUDIO RECORDING AND PLYABACK DEVICE, AND POWER FEED METHOD FOR AUDIO RECORDING AND PLAYBACK DEVICE

摘要

An audio recording and playback device, of the present invention, capable of recording and playing back audio, comprises an audio input section for converting audio input during an audio recording operation into an electrical audio signal, a power feed section for carrying out power feeds to the audio input section by means of a balanced transmission line, an amplifier section for amplifying the audio signal, a boost section for generating a power feed voltage to be applied to the balanced transmission line and outputting to the power feed section, a output voltage changing section for carrying out control to vary the output voltage of the boost section, and a control section for controlling the power feed voltage of the power feed section by controlling the power feed section and the output voltage changing section.

主权项

1. An audio recording and playback device, capable of recording and playing back audio, comprising:
an audio input section for converting audio input during an audio recording operation into an electrical audio signal; a power feed section for carrying out power feed to the audio input section by means of a balanced transmission line; an amplifier section for amplifying the audio signal; a boost section for generating a power feed voltage to be applied to the balanced transmission line and outputting to the power feed section; an output current detection section for detecting output current output by the boost section to the power feed section; an output voltage changing section for carrying out control to vary the output voltage of the boost section; and a control section for controlling the power feed voltage of the power feed section by controlling the power feed section and the output voltage changing section, wherein the control section controls the output voltage changing section, based on output of the output current detection section, to bring the output voltage of the boost section to a specified target voltage, and outputting to the power feed section, and wherein the control section, when the output of the output current detection section is larger than a specified value, in a state where a first target voltage has been set and the output voltage of the boost section has been brought to the first target voltage, sets the output voltage of the boost section to a second target voltage that is higher than the first target voltage.