Abstract: In mail terminal equipment for receiving and reproducing a mail which has been produced using multi-media data containing a plurality of continuous audio data and a plurality of drawing data synchronized with at least a part of the audio data and has been transmitted thereto. Where reproduction of the drawing data is later than that if the audio data, the drawing data is synchronized with the audio data without interrupting reproduction of the audio data. When the drawing data still remains which at certain timing (e.g., timing when supplementing the audio data to a audio buffer for storing the audio data waiting for reproduction), should be reproduced until that time point, but is not reproduced resulting from the delay of reproduction of the drawing data due to the drawing processing, the loading situation and the like, the drawing data of interest is skipped so as not to be reproduced, and the next drawing data is reproduced.

Abstract: The packet communication system enables communication between a communication unit connected in a conventional telephone network and a communication unit in a packet mode network. A device for exclusively selecting the connection network is provided so that, at the time of transmission of a signal from one communication unit to another, the connection path is selected according to the kind of the network to which the other communication unit belongs. At the time of signal reception, the communication unit is connected to only one of the conventional telephone network and the packet mode network. The packet communication system includes a packet processor for converting an information signal, such as speech, inputted from an input unit (for example, a transmitter microphone of a handset) into the form of a packet.

Abstract: An oscillation circuit in which the driving performance of a CMOS transistor therein for enabling/disabling an oscillating function is enhanced without unstabilizing the oscillation operation, by applying a higher potential to the back gate of the CMOS transistor when a signal other than an oscillation signal is inputted/outputted, and a lower potential when generating the oscillation signal.

Abstract: An internetworking apparatus which handles a scale of a network flexibly without degrading high speed operation. A router manager and a plurality of routing accelerator modules for performing routing are connected to one another through a high speed bus, and a plurality of communication ports are connected to the respective routing accelerators independently of one another. The plurality of routing accelerators can perform the routing for reception data packet at high speed. If more routing accelerators are provided, the disposal to the networks having a small scale to a large scale can be readily realized.

Abstract: A scroll type compressor having a pair of scroll type compression units which are encased in the same casing so as to make a common use of a lubricating oil reservoir provided in the casing, wherein the compression units have compression elements, drive shafts, driving motors and other components which are of the same constructions and specifications, and wherein each of the compression units are adapted to be driven selectively by commercial electrical power or through a frequency-variable inverter so as to operate at different speeds. Since both compression units can be made up from the same components such as the compression elements, loads in the production, service and administration, are greatly reduced contributing to a reduction in the labor and cost, while eliminating any mounting error.

Abstract: In communications control unit for sequentially scanning a plurality of line sets to which full-duplex lines are connected, for reading out line control word provided in correspondence to the line from a memory when a data transmission/reception request exists in the line set, and for executing the data transmitting and receiving operations with the relevant line set, one line control word including both of transmission control information and reception control information is read out in the time slot assigned to one full-duplex line, and the data transmitting and receiving operations are simultaneously executed.