Data communication apparatus having common memory for storing video and audio data

In a data communication apparatus including communication means for transmitting and receiving video data and audio data, said video data being derived from documents, a memory for storing at least video data and audio data received by said communication means, memory control means for executing management of utilization of said memory and for controlling data write and read operations of said memory, and data display means;

• the improvement comprising display control means for controlling said data display means to display first memory capacity information representing an amount of capacity available in said memory for storing video data and second memory capacity information representing an amount of capacity available in said memory for storing audio data, said display control means comprising means for expressing said first memory capacity information as a number of first data units, each of said first data units consisting of an amount of data corresponding to one standard document page, and for expressing said second memory capacity information as a number of second data units, each of said second data units consisting of an amount of data corresponding to one fixed-duration telephone message, and means for controlling said display means to display said number of first data units and number of second data units,
• wherein video data which are successively written into said memory are written into addresses which successively change in a direction from a first one of highest address and a lowest address of said memory towards a second one of said highest and lowest addresses, and wherein audio data which are successively written into said memory are written into addresses which successively change in a direction from said second one of said highest and lowest addresses of said memory towards said first one of said highest and lowest addresses.

In a data communication apparatus including communication means for transmitting and receiving video data and audio data, said video data being derived from documents, a memory for storing at least audio data received by said communication means, memory control means for executing management of utilization of said memory and for controlling data write and read operations of said memory, data display means, and display control means controlling said data display means to display memory capacity information representing an amount of capacity of said memory which can be used for storing audio data;

• the improvement whereby said display control means functions to express said memory capacity information as a number of audio data units, each of said audio data units consisting of an amount of data representing one fixed-duration telephone message, and to control said display means to display said number of audio data units as a number of said telephone messages,
• wherein said second data units corresponding to telephone messages respectively correspond to standard recording intervals for storing audio data in said memory, further comprising user operated means for selectively establishing one of a plurality of respectively different values of standard recording intervals by a user, wherein said display means is controlled by said display control means to display, in response to selection of each said different standard recording interval value, a corresponding different value of said second memory capacity information, expressed as a number of telephone messages of each said different standard recording interval, and to display an indication of one of said standard recording interval values which is currently selected.

In a data communication apparatus including communication means for transmitting and receiving video data and audio data, said video data being derived from documents, a memory for storing at least audio data received by said communication means, memory control means for executing management of utilization of said memory and for controlling data write and read operations of said memory, data display means, and display control means controlling said data display means to display memory capacity information representing an amount of capacity of said memory which can be used for storing audio data;

• the improvement whereby said display control means functions to express said memory capacity information as a number of audio data units, each of said audio data units consisting of an amount of data representing one fixed-duration telephone message, and to control said display means to display said number of audio data units as a number of said telephone messages, further including an audio voice message receiver;
• wherein said memory stores audio data received by said audio voice message. receiver and said memory capacity information represents an amount of capacity of said memory for storing messages received by said audio voice message receiver,
• whereby said display control means operates to express said capacity of said memory for storing messages received by said audio voice message receiver in the audio data units of fixed-duration telephone messages.