U.S. Philips Corporation

Adrianus C Van De Waterlaat

Franciscus W Vreeswijk

Theodora L Hamann

Johannes Yzebrand Tichelaar

Johannes I Tichelaar

Wouter Venis

Wilhelmus A Van De Goor

Leendert T Rosendaal

Teunis Poot

In a method of transmitting an extended television signal comprising a wide aspect ratio picture between two horizontal bars so as to form a standard aspect ratio picture, in which vertical resolution enhancement signals are transmitted to improve the vertical resolution upon display on an enhanced television receiver, this method comprises the steps of separating the vertical resolution enhancement signals into a low-frequency part (DC-1.5 MHz) and a high-frequency part (1.2-2.9 MHz); transmitting the high-frequency part during the horizontal bars, which high-frequency part is not modulated onto a subcarrier; and transmitting the low-frequency part during the horizontal bars after modulation onto a subcarrier (4.43 MHz).

Letterbox television system

In a receiver for extended television signals in which a wide aspect ratio picture and at least one horizontal bar are jointly coded so as to form a standard aspect ratio picture, the at least one horizontal bar conveys vertical resolution enhancement information, and the extended television signal receiver includes an arrangement (107,111) for modifying the vertical resolution enhancement information to reduce an amount of distortions comprised therein, and an arrangement for combining the wide aspect ratio picture and the modified vertical resolution enhancement information to provide an enhanced wide aspect ratio picture.

Extended television signal receiver

In a television signal receiver, including an intermediate frequency (IF) filter (3) having an intermediate frequency filter group delay, and an intermediate frequency (IF) demodulator (5) coupled to the intermediate frequency filter (3), a correction filter arrangement (9, 13, 15) is coupled to the intermediate frequency demodulator (5) and has a programmable group delay for cancelling a group delay precorrection carried out at a transmitter and the intermediate frequency filter group delay.

Television signal reception

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Eindhoven, Netherlands

Adrianus C Van De Waterlaat