Television – Image signal processing circuitry specific to television – Switching
Patent
1998-03-20
1998-12-01
Flynn, Nathan J.
Television
Image signal processing circuitry specific to television
Switching
348725, 4552771, 4552772, H04N 544
Patent
active
058446320
ABSTRACT:
In a first diversity receiving apparatus, during an antenna selection operation, one of antennas are selected such that each of antennas successively connected to a receiver for consecutive horizontal retrace periods but for horizontal scanning periods following the horizontal retrace period, the selected antenna showing a largest level at the previous antenna selection operation is connected to the receiver to detect levels derived from respective antennas. The antenna showing a largest level is selected at the current antenna selection operation to receive a radio wave television signal for the following M (a natural number) horizontal scanning cycles. M is changed in accordance with the phasing condition. For example, M is changed according to a speed of vehicle, a field intensity, a frequency of the received television signal, etc. The switching circuit and tuner may be provided doubly to prevent the affection of switching noise. A second apparatus determines the selected antenna by further detecting noise levels derived from the respective antennas during a vertical retrace period. A frequency of switching of antennas for determining the selected antenna is reduced to reduce a switching noise on the reproduced image or in the reproduced sound.
REFERENCES:
patent: 5410748 (1995-04-01), Hayashi et al.
patent: 5742583 (1998-04-01), Scott
Hasegawa Makoto
Kishigami Takaaki
Mimura Masahiro
Nakamura Masahiko
Takagi Yoshinori
Flynn Nathan J.
Matsushita Electric - Industrial Co., Ltd.
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