A method for fabricating a integrated circuit is disclosed. Based on a single-view depth image, the method may include receiving an input of a depth image, estimating a missing depth value based on connectivity with a neighboring value in a local area of the depth image, and correcting the missing depth value. A voice mixer is provided which stores a plurality of messages to be read out and processed in order to transmit an aural message to the cordless handset under the control of a control unit in accordance with specific codes indicating the current status of the facsimile apparatus. The enabling technology is a novel inverter circuit topology where the DC source is connected directly to the positive bus of the DC to AC converter and where a negative bus is generated from the positive bus with a flyback converter.