Video telephone
First Claim
1. A video telephone in which image data of a still picture in a first picture mode and image data of a still picture in a second picture mode are transmitted through an audio signal transmission line and a still picture in the first or second mode is displayed, with the second mode picture being smaller than the first mode picture, comprising;
- a memory having an address capacity determined by the size of the still picture in the first picture mode; and
memory control means for controlling the writing of data so that when image data of a still picture in the first picture mode is received said image data is written in all addresses of said memory, for controlling the writing of data so that when image data of a still picture in said second picture mode is received said image data is written into a predetermined area that includes less than all of said addresses of said memory, and for controlling the reading out of data from said memory so that data in all addresses of said memory is read out for display of a still picture in said first picture mode and said second picture mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A video telephone displays a still picture in a first picture mode and a still picture in a second picture mode, which is smaller than that of the first picture mode, using image data transmitted over an audio signal transmission line and includes a memory having an address capacity corresponding to the size of the still picture in the first picture mode. In this video telephone, when image data of the still picture in the first picture mode is received, the image data is written in all addresses of the memory and, when image data of the still picture in the second picture mode is received, the image data is written only in predetermined addresses of the memory. This permits the same display read-out for all addresses of the memory to display the still picture whether in the first or second picture mode.
-
Citations
12 Claims
-
1. A video telephone in which image data of a still picture in a first picture mode and image data of a still picture in a second picture mode are transmitted through an audio signal transmission line and a still picture in the first or second mode is displayed, with the second mode picture being smaller than the first mode picture, comprising;
-
a memory having an address capacity determined by the size of the still picture in the first picture mode; and memory control means for controlling the writing of data so that when image data of a still picture in the first picture mode is received said image data is written in all addresses of said memory, for controlling the writing of data so that when image data of a still picture in said second picture mode is received said image data is written into a predetermined area that includes less than all of said addresses of said memory, and for controlling the reading out of data from said memory so that data in all addresses of said memory is read out for display of a still picture in said first picture mode and said second picture mode. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A video telephone in which image data of a still picture in a first picture mode and image data of a still picture in a second picture mode are transmitted through a transmission line having an audio frequency bandwidth and in which the second picture mode provides a picture smaller than in the first picture mode, comprising:
-
a memory for storing said image data; means for controlling writing in and reading out of image data from said memory display means for displaying a respective picture of said first and second picture modes; and a mask circuit receiving image data from said memory and connected to said display means, whereby read-out image data is supplied through said mask circuit to said display means, said mask circuit being responsive to said means for controlling so that when said image data represents said second still picture, a picture portion outside said second still picture is masked by predetermined data. - View Dependent Claims (8, 9, 10, 11, 12)
-
Specification