Circuit and operation process for a cordless reproduction and/or recording device with extended playtime

摘要

Circuit has a miniature mass storage device (1) that is connected to a buffer (2) memory and a signal processing device (3) via a data bus, a battery (5) that is used by a power supply device to produce supply voltages (u1-u3) and a monitor device (6) that monitors buffer memory loading, generating a signal that is used by a controller (7) to switch the mass storage device to energy saving mode. An Independent claim is made for a method for controlling the power supply to a portable recording and playback device in which the device can be switched between normal and power saving mode to conserve energy.