Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Reexamination Certificate
1997-06-18
2002-10-29
Kostak, Victor R. (Department: 2611)
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
C348S511000, C348S542000
Reexamination Certificate
active
06473134
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a television receiver, an antenna diversity controller, a synchronizing signal stabilizer, a luminance signal stabilizer, a color signal stabilizer, a video signal stabilizer, and a method of transmitting a television signal and a television signal receiver.
2. Related Art of the Invention
Recently, a car television set which is one of video signal receivers for a mobile unit comes into widespread use.
Hereinafter, an example of such a car television set of the prior art will be described with reference to the drawings.
FIG. 40
is a view showing the configuration of a car television set of the prior art.
In the figure,
901
designates diversity antennas,
902
designates a tuner unit,
903
designates a video signal processing unit,
904
designates a display control unit,
905
designates a display unit,
906
designates an audio signal processing unit, and
907
designates an audio output unit.
The operation of the thus configured car television set will be described.
First, a television signal obtained by the diversity antennas
901
is subjected to video detection and audio detection in the tuner unit
902
to be divided into a video signal and an audio signal. The audio signal is subjected to a filtering process by the audio signal processing unit
906
, and then transmitted to the audio output unit
907
, thereby obtaining an audio output.
On the other hand, the video signal obtained from the tuner unit
902
is subjected to a color signal process and a synchronizing signal process in the video signal processing unit
903
to be divided into RGB signals, and then transmitted to the display control unit
904
. The display control unit transmits the RGB signals and the synchronizing signal obtained from the video signal processing unit
903
to the display unit
905
, and an image is output from the display unit
905
.
In the configuration, however, multipaths of the RF video signal and variation of the electric field strength during mobile reception cause the video and audio signals to be disturbed. This produces problems as follows. In the video signal, a disturbance appears in the synchronizing signal, so that the image flows or is distorted. In the audio signal, many pulsative noises are produced.
On the other hand, in the above configuration, however, wave multipaths in mobile reception cause the video and audio signals to be disturbed. This produces a problem in that disturbances such as image flow, distortion, image skip, and multiple images occur in the video signal. At present, the ghost cancel system using a ghost cancel reference signal (GCR) is employed. However, the system requires several seconds until an effect is attained, and has a problem in that the system cannot attain an effect in mobile reception.
SUMMARY OF THE INVENTION
In view of the problems of the related art, it is an object of the invention to provide a television receiver, an antenna diversity controller, a synchronizing signal stabilizer, a luminance signal stabilizer, a color signal stabilizer, and a video signal stabilizer which can stabilize an image in mobile reception and reduce noises in an audio signal as compared with the prior art.
In view of the problems of the related prior it is an object of the invention to provide a method of transmitting a television signal and a television signal receiver in which an image in mobile reception can be stabilized as compared with the prior art.
A television receiver of the invention comprises:
receiving means for receiving a television signal;
synchronizing signal detecting means for detecting a synchronizing signal of a video signal obtained from said receiving means;
electric field information detecting means for detecting electric field information from a signal obtained from said receiving means;
synchronizing signal stabilizing means for stabilizing the detected synchronizing signal on the basis of the electric field information;
display controlling means for controlling a display of the video signal by using the stabilized synchronizing signal; and
displaying means for displaying a signal output from said display controlling means.
A television receiver of the invention comprises:
receiving means for receiving a television signal;
synchronizing signal detecting means for detecting a synchronizing signal of a video signal obtained from said receiving means;
synchronizing signal stabilizing means for stabilizing the detected synchronizing signal;
video signal stabilizing means for stabilizing the video signal obtained from said receiving means, by using the stabilized synchronizing signal, and for outputting the stabilized video signal;
display controlling means for controlling a display of the stabilized video signal by using the stabilized synchronizing signal; and
displaying means for displaying a signal output from said display controlling means.
A television receiver of the invention comprises:
receiving means for receiving a television signal;
synchronizing signal detecting means for detecting a synchronizing signal of a video signal obtained from said receiving means;
synchronizing signal stabilizing means for stabilizing the detected synchronizing signal;
display controlling means for controlling a display of the video signal by using the stabilized synchronizing signal; and
liquid crystal displaying means for conducting a liquid crystal display of a signal output from said display controlling means.
An antenna diversity controller of the invention comprises: antennas of a diversity system for receiving a television wave; receiving means of the diversity system for receiving television signals obtained from said antennas; and diversity switchover controlling means for sending an antenna switchover signal to said receiving means to conduct a diversity switchover control, wherein said controller further comprises:
synchronizing signal detecting means for detecting a synchronizing signal of a video signal obtained from said receiving means;
synchronizing signal stabilizing means for stabilizing the detected synchronizing signal; and
timing detecting means for detecting a timing of the video signal, on the basis of the stabilized synchronizing signal, and
said diversity switchover controlling means sends the antenna switchover signal to said receiving means on the basis of at least the detected timing, and conducts the diversity switchover control.
A television receiver of the invention comprises:
antennas of a diversity system for receiving a television wave;
receiving means of the diversity system for receiving television signals obtained from said antennas;
synchronizing signal detecting means for detecting a synchronizing signal of a video signal obtained from said receiving means;
synchronizing signal stabilizing means for stabilizing the detected synchronizing signal;
timing detecting means for detecting a timing of the video signal on the basis of the stabilized synchronizing signal;
diversity switchover controlling means for sending an antenna switchover signal to said receiving means on the basis of at least the detected timing to conduct a diversity switchover control;
electric field information detecting means for detecting electric field information from a signal obtained from said receiving means;
noise predicting means for predicting noises of an audio signal obtained from said receiving means, on the basis of the electric field information;
noise canceling means for reducing noises of the audio signal, on the basis of the predicted noises obtained from said noise predicting means and the electric field information;
audio signal reproducing means for reproducing an audio signal output from said noise canceling means;
display controlling means for controlling a display of the video signal obtained from said receiving means, by using the stabilized synchronizing signal; and
displaying means for displaying a signal output from said display controlling means.
A television receiver of the invention comprises:
antennas of a diversity system for rece
Kane Joji
Nohara Akira
Nomura Noboru
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
Smith , Gambrell & Russell, LLP
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