JP2641148B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver applicable to a simulcast broadcasting system for simultaneously broadcasting the same broadcasting program in different television broadcasting systems.

[0002]

2. Description of the Related Art In order to realize high-quality television broadcasting, there is a method of simultaneously broadcasting high-quality broadcasting of the same program content in a completely different system, which is called a simulcast system. On the other hand, the recent advancement of digital technology has increased the feasibility of television broadcasting by digital transmission.Simulcast broadcasting, which simultaneously transmits the current analog television broadcasting and digital television broadcasting, will be implemented in the future. Promising.

[0003] In this broadcast system, in the current broadcast using analog signals, even if the reception state deteriorates, the broadcast contents can be generally understood only by the deterioration of the decode signal. On the other hand, in digital transmission, due to the effect of the error correction code, there is no deterioration of the decoded signal even if the reception state is deteriorated to some extent, but if the reception state is further increased, the decoded signal is rapidly deteriorated. In addition, it has been considered that the digital transmission level needs to be kept as low as possible so as not to disturb the adjacent channel, and the possibility of deterioration in the reception state of digital transmission is high.

[0004]

As described above, a simulcast broadcasting system for simultaneously performing the broadcasting based on the analog signal and the television broadcasting based on the digital signal is promising. No consideration has been given to the deterioration of the reception state of digital transmission in.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the same broadcasting program as that of the first television broadcasting system is transmitted from the same broadcasting station to the second broadcasting station.
A television receiver for receiving simulcast broadcasts transmitted simultaneously by the first and second television broadcasting systems, and a decoder device for each of the first and second television broadcasting systems; Receiving state detecting means for detecting a receiving state of a television broadcast by the system, and the second state by the receiving state detecting means.
Selecting means for automatically selecting either one of the first and second television broadcast decoding signals from the detection result of the reception state of the television broadcasting according to the first television broadcasting system. A John receiver is provided.

Further, in the present invention, the first television broadcasting system is a television broadcasting by an analog signal, the second television broadcasting system is a television broadcasting by a digital signal, and the reception state detecting means is Another object of the present invention is to provide a television receiver for detecting an error frequency of television broadcast data of the second television broadcast system.

[0007]

Therefore, according to the present invention, the reception state of a television broadcast of one broadcast system in simulcast is detected, and if the state is judged to be good, high-quality decoding of the broadcast system is performed. If it is determined that the signal is in a poor reception state, a decode signal of another broadcast system is selected to output video and audio.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention. In FIG. 1, reference numeral 1 denotes an antenna, and reference numeral 2 denotes an existing television broadcasting system (first television broadcasting system). A first tuner for receiving a transmitted analog television broadcast signal;
Is a second tuner for receiving a digital signal television broadcast signal transmitted by another television broadcast system (second television broadcast system), and the broadcast signal is a television broadcast of the analog signal. The same broadcast program transmitted from the same broadcast station as the signal is shown.
Reference numeral 4 denotes a first converter for converting a television broadcast signal based on the current analog signal received by the first tuner 2 into a decode signal which can be output to a cathode ray tube and a speaker, that is, a video signal and an audio signal by a known method. The signal processing circuit constitutes a first decoder device together with the first tuner 2.

Reference numeral 5 denotes a television broadcast signal based on a digital signal received by the second tuner 3, and
The input signal is subjected to error correction, decoding, D / A conversion, and other processing, and is converted into a decoded signal that can be output to a cathode ray tube and a speaker, that is, a second signal that is converted into a video signal and an audio signal.
And a second decoder device together with the second tuner 3.

Reference numeral 6 denotes a switching circuit which selects the decode signal from the first and second signal processing circuits 4 and 5 and supplies the selected signal to the output device 7 at the next stage. Controlled. The output device 7 is a video output device such as a cathode ray tube and an audio output device such as a speaker.

Reference numeral 8 denotes a reception state detection circuit that outputs a signal indicating the quality of the reception state by detecting an error frequency of the data of the digital signal output from the second tuner 3. The control circuit 9 performs a television broadcast by a digital signal based on a signal indicating whether the reception state of the detection circuit 8 is good, that is, when the reception state is good,
When the reception state is poor, a control signal is output to the switching circuit 6 so as to select a television broadcast by an analog signal.

[0012] Since the present invention is configured as described above, the antenna receives each television broadcast signal of an analog signal and a digital signal transmitted from the same broadcast station, and based on this, the first antenna receives the first broadcast signal. The tuner 2 receives a television broadcast signal based on an analog signal, and the first signal processing circuit 4 decodes the television broadcast signal. Further, the second tuner 3 receives a television broadcast signal based on a digital signal, and the second signal processing circuit 5 decodes the digital television broadcast signal.

At this time, the reception state detecting circuit 8 looks at the digital signal obtained from the second tuner 3 and detects the error frequency of the data. 6 causes the second signal processing circuit 5 to be selected to supply a television broadcast signal of a digital signal to the output device 7. If the reception state is poor, the control circuit 9 causes the switching circuit 6 to select the first signal processing circuit 4 and supply the television broadcast signal of an analog signal to the output device 7.

[0014]

Since the present invention is constructed as described above, if the receiving state of a television broadcast signal in one broadcasting system deteriorates and becomes inappropriate, the other broadcasting system is automatically set. , The video and audio are output without losing the broadcast contents.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electric circuit showing an embodiment of a television receiver according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 first tuner 3 second tuner 4 first signal processing circuit 5 second signal processing circuit 6 switching circuit 7 output device 8 reception state detection circuit 9 control circuit

Claims (2)

(57) [Claims] 1. A television receiver for receiving a simulcast broadcast in which the same broadcast program as the first television broadcast system is simultaneously transmitted in a second television broadcast system, wherein the first and second television broadcasts are provided. Decoder devices for television broadcasting of the first television broadcasting system, receiving state detecting means for detecting a receiving state of the television broadcasting by the second television broadcasting system, and the second television broadcasting system by the receiving state detecting means Selecting means for automatically selecting a decode signal of one of the first and second television broadcasts from a detection result of a reception state of the television broadcast by the television set. John receiver. 2. The method according to claim 1, wherein the first television broadcast system is a television broadcast using analog signals and
Is a television broadcast by a digital signal, and the reception state detecting means is for detecting an error frequency of data of the television broadcast of the second television broadcast system. The television receiver according to claim 1.