Television – Receiver circuitry – Tuning
Patent
1996-08-01
1998-07-07
Peng, John K.
Television
Receiver circuitry
Tuning
348725, 4552771, 4552772, H04N 544
Patent
active
057776938
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: 5303396 (1994-04-01), Oojagi et al.
patent: 5335010 (1994-08-01), Lindemeier et al.
Hasegawa Makoto
Kishigami Takaaki
Mimura Masahiro
Nakamura Masahiko
Takagi Yoshinori
Flynn Nathan J.
Matsushita Electric - Industrial Co., Ltd.
Peng John K.
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