Ten TV channels by telephone line

1994/09/01 Elhuyar Zientzia Iturria: Elhuyar aldizkaria

• Komunikazioak

A New York electronics company specializing in numerical compression says that ten television programs can be sent from a telephone line. The average amount of information that is transported through the line in telephone interviews is zero compared to that required by the television signals of the ten programs. Therefore, television programs will not be able to broadcast over long distance through large electronic stations, but between two points directly related.

In these conditions, more information can be transmitted than in regular telephone conversations, and thanks to special compression algorithms, video signals can be transported.

Of course, compression will alter the initial signal, but the resulting image quality will be similar to that of the VHS magnetoscope. It is therefore an issue for the general public and not for professionals who need a lot of quality.

However, this telephone thread transmission allows communication in two directions. The viewer can therefore use the telephone keypad or keyboard designed for this purpose to “interview” with the one who broadcasts the program.

Those who have projected the system claim that telephone cables have twenty-six underground lines on the street and that in turn they will be able to transmit thirty programs from both directions.

This interesting project attracts companies like Bell Telephone, Gulf & Western, with the main telephone networks of the United States.