JP2000224497A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the reception state degradation of analog broadcasting by the interference of digital broadcasting waves by detecting a reception state at the time of viewing the analog broadcasting in an area where the digital and analog broadcastings coexist and the digital broadcasting waves are arranged in the adjacent channel of analog broadcasting waves. SOLUTION: At the time of receiving the analog broadcasting waves by this TV receiver, for input analog/digital coexisting broadcasting waves, the desired analog broadcasting waves of a tuning control part 9 are converted to intermediate frequency signals in a tuner part 1, unrequired signals other than an intermediate frequency signal band are eliminated in a SAW filter 2 and conversion to color video signals including the audio signals of a center frequency 4.5 MHz is performed in a video detection part 4. Then, the audio signals are eliminated in a 4.5 MHz trap circuit 5, separation into luminance and chrominance signals is performed in a YC separation part 6 through a frequency characteristic adjustment part 11 and they are inputted to respective amplification parts 7 and 8. A luminance signal frequency characteristic detection part 13 detects unrequired signal components mixed in a color signal band 4.5-6 MHz from the digital signals of the adjacent channel from the luminance signals of the amplification part 7 and optimally controls the adjustment part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of television receivers.

[0002]

2. Description of the Related Art In a current analog broadcast, a channel is not used in a channel adjacent to a service channel. Therefore, a receiver is not designed in consideration of the adjacent channel. Hereinafter, a conventional example will be described with reference to FIG.

The tuner 1 extracts a signal of a desired receiving channel from a television signal received by an antenna, and converts a video carrier into an intermediate frequency signal of 58.75 MHz and an audio carrier of 54.25 MHz. The intermediate frequency signal is amplified by the video intermediate collection amplifier circuit 2. In this case, only the signal of the channel to be received is stably amplified, and the band-pass filter 2 is provided at the preceding stage in order to suppress other unnecessary signals. Have been placed. The video intermediate frequency signal amplified by the video intermediate frequency amplification circuit 3 is detected by the video detection circuit 4, and a composite video signal is extracted. Since the composite video signal also includes an audio component, it is removed by the 4.5 MHz trap 5. After that, the composite video signal is divided into a luminance component and a color component by the YC separation circuit 6 and input to the luminance amplification circuit 7 and the color amplification circuit 8, respectively.

[0004]

When digital broadcasting starts, the broadcasting channels become a mixture of digital broadcasting and analog broadcasting, and it is conceivable that digital broadcasting waves are arranged in channels adjacent to analog broadcasting waves. In this situation, the conventional television receiver is designed on the premise of analog broadcasting that does not transmit adjacent channels due to the problem of adjacent interference, and thus may receive adjacent channel interference from digital broadcast waves.

[0005] In particular, when a digital broadcast wave is located in an upper adjacent channel of an analog broadcast wave, a signal of the digital broadcast wave leaks into the band of the analog broadcast wave, and the reception state of the analog broadcast is deteriorated due to interference by the digital broadcast wave signal. There is a problem to do.

[0006]

In order to solve the above-mentioned problems, a television receiving apparatus according to the present invention is provided with a function of simultaneously performing analog broadcasting and digital broadcasting, and providing a digital broadcasting physical channel on an upper adjacent channel of the analog broadcasting physical channel. When an analog broadcast is viewed in an environment area where channels are arranged, a reception state is detected, and the characteristics of the received analog video signal are optimally adjusted according to the state.

According to the present invention, in a region where digital broadcasting and analog broadcasting are mixed and digital broadcasting waves are arranged on channels adjacent to the analog broadcasting waves, particularly, digital broadcasting waves are placed on the upper adjacent channel of the analog broadcasting waves. Is located, it is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal in which the digital broadcast wave signal leaks into the band of the analog broadcast.

Further, in order to solve the above-mentioned problems, a television receiver according to the present invention provides an analog broadcast and a digital broadcast at the same time, and a digital broadcast physical channel is arranged in an upper adjacent channel of the analog broadcast physical channel. When an analog broadcast is viewed in an environment area, the reception area is specified to set an optimal reception characteristic for the area.

According to the present invention, in a region where digital broadcasting and analog broadcasting are mixed, and where digital broadcasting waves are arranged on channels adjacent to analog broadcasting waves, digital broadcasting waves are preferably placed on upper adjacent channels of analog broadcasting waves. Is located, it is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal in which the digital broadcast wave signal leaks into the band of the analog broadcast.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a television receiver according to a first aspect of the present invention, analog broadcasting and digital broadcasting are simultaneously serviced, and a digital broadcasting physical channel is arranged in an upper adjacent channel of an analog broadcasting physical channel. When analog broadcasting is viewed in an environment area, the reception state is detected, and the characteristic of the received analog video signal is optimally adjusted according to the state. In areas where digital broadcast waves are placed on channels,
When the digital broadcast wave is located in the upper adjacent channel of the analog broadcast wave, it is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal in which the digital broadcast wave signal leaks into the analog broadcast band. .

Next, a television receiver according to a second aspect of the present invention is the television receiver according to the first aspect, wherein the tuner device selects a desired received broadcast wave signal from broadcast wave signals received from an antenna. A tuning control device for controlling a tuning operation of the tuner, a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected by the tuner device and extracting only a video intermediate frequency signal, and the video A video intermediate frequency amplifier for amplifying an intermediate frequency, a detection device for detecting the video intermediate frequency signal and extracting a color video signal, a unit for removing an audio intermediate frequency signal remaining in the color video signal, Means for changing a frequency characteristic; YC separating means for separating a luminance signal and a color signal from the optimized color video signal; It comprises a luminance amplifying device that amplifies the color signal, and a color amplifying device that amplifies the color signal, characterized in that the received analog video signal characteristics are optimized according to the state of deterioration of the image.
In an area where a digital broadcast wave is arranged in a channel adjacent to an analog broadcast wave, especially when a digital broadcast wave is located in an upper adjacent channel of the analog broadcast wave, the signal of the digital broadcast wave falls within the band of the analog broadcast. It is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the leaked digital broadcast wave signal.

Next, a television receiver according to a third aspect of the present invention is the television receiver according to the second aspect, wherein a center frequency is removed as means for removing an audio intermediate frequency signal remaining in the color video signal. It is characterized by comprising a cascade connection of a 4.5 MHz trap filter and a trap filter having a center frequency of 4.5 MHz or higher. Digital broadcast waves are mixed with digital broadcast waves in a channel adjacent to the analog broadcast waves. In an area where the digital broadcast wave is arranged, particularly, even when the digital broadcast wave is located in the upper adjacent channel of the analog broadcast wave, the analog broadcast signal interferes with the digital broadcast wave signal leaking into the analog broadcast band. Can be improved in the reception state.

Next, a television receiver according to a fourth aspect of the present invention is the television receiver according to the second aspect, which can be manually adjusted from the outside as means for changing the frequency characteristic of the color video signal. In a region where digital broadcasting and analog broadcasting are mixed, and a digital broadcasting wave is arranged in a channel adjacent to the analog broadcasting wave, particularly, an upper adjacent channel of the analog broadcasting wave Even when a digital broadcast wave is located in the area, it is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal in which the signal of the digital broadcast wave leaks into the band of the analog broadcast.

Next, a television receiver according to a fifth aspect of the present invention is the television receiver according to the second aspect, wherein the means for changing the frequency characteristic of the color video signal includes a detection signal of a reception state or the like. It is characterized by having a frequency characteristic variable device that can be automatically adjusted by the digital broadcast and the analog broadcast, and in a region where the digital broadcast wave is arranged in a channel adjacent to the analog broadcast wave, especially in the analog broadcast. Even when the digital broadcast wave is located in the upper adjacent channel of the wave, it is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal in which the signal of the digital broadcast wave leaks into the band of the analog broadcast.

According to a sixth aspect of the present invention, in the television receiver of the second aspect, the channel selection control device automatically selects a tuner according to a reception state detection signal or the like. It is characterized by controlling the frequency and optimizing the reception condition, and in the area where digital broadcasting and analog broadcasting are mixed, where digital broadcasting waves are arranged in channels adjacent to analog broadcasting waves, especially for analog broadcasting waves. Even when the digital broadcast wave is located in the upper adjacent channel, it is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal in which the signal of the digital broadcast wave leaks into the band of the analog broadcast.

Next, in the television receiver according to the seventh aspect of the present invention, the analog broadcast and the digital broadcast are simultaneously provided, and the digital broadcast physical channel is arranged in the upper adjacent channel of the analog broadcast physical channel. When analog broadcasting is viewed in an environment area, the reception area is specified to set the optimum reception characteristics for the area.Digital broadcasting and analog broadcasting are mixed, and digital broadcasting is performed on adjacent channels of analog broadcasting waves. In a region where a broadcast wave is arranged, particularly when a digital broadcast wave is located in an upper adjacent channel of an analog broadcast wave, a signal of the digital broadcast wave leaks into a band of the analog broadcast due to interference of the digital broadcast wave signal. It is possible to improve the deterioration of the reception state of the analog broadcast.

Next, a television receiver according to an eighth aspect of the present invention is the television receiver according to the seventh aspect, wherein the tuner device selects a desired received broadcast wave signal from broadcast wave signals received from an antenna. A tuning control device that controls a tuning operation of the tuner, a bandpass filter that removes an audio intermediate signal from an intermediate frequency signal selected by the tuner device and extracts only a video intermediate frequency signal, and the video A video intermediate frequency amplifier for amplifying an intermediate frequency, a detection device for detecting the video intermediate frequency signal and extracting a color video signal, a unit for removing an audio intermediate frequency signal remaining in the color video signal, and the optimized YC separating means for separating a luminance signal and a color signal from a color video signal, a luminance amplifying device for amplifying the luminance signal, and a color for amplifying the color signal It is characterized by having an amplifying device and a means for optimizing the received analog video signal characteristics based on the reception area information. In such a case that the digital broadcast wave is arranged in a channel adjacent to the analog broadcast wave in a mixed digital broadcast and analog broadcast. In a region, particularly, when a digital broadcast wave is located in an upper adjacent channel of an analog broadcast wave, the digital broadcast wave signal leaks into the analog broadcast band. Can be improved.

According to a ninth aspect of the present invention, in the television receiver according to the eighth aspect, the means for optimizing the received analog video signal characteristics includes inputting reception area information. In the device that stores the channel arrangement information, the control signal is sent to the frequency characteristic adjustment unit so that optimal reception can be performed in the area, and the analog video signal characteristics are automatically optimized. In a region where analog broadcasts are mixed and digital broadcast waves are arranged in channels adjacent to analog broadcast waves, especially when digital broadcast waves are located in channels adjacent to the upper side of analog broadcast waves, the signals of digital broadcast waves are analog. It is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal leaking into the broadcast band.

According to a tenth aspect of the present invention, in the television receiver according to the eighth aspect, the means for optimizing the received analog video signal characteristic includes inputting reception area information. In the device that stores the channel arrangement information, the control signal is sent to the tuning control unit so that optimal reception is possible in the area, and the analog video signal characteristics are automatically optimized. In a region where analog broadcasts are mixed and digital broadcast waves are arranged in channels adjacent to analog broadcast waves, especially when digital broadcast waves are located in channels adjacent to the upper side of analog broadcast waves, the signals of digital broadcast waves are analog. It is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal leaking into the broadcast band.

(Embodiment 1) Embodiments of the present invention described in claims 1, 2 and 3 of the present invention will be described below with reference to FIG. FIG. 1 shows a tuner unit 1 for selecting a desired reception broadcast wave signal from a broadcast wave signal received from an antenna, a tuning control unit 9 for controlling a tuning operation of the tuner 1, and a tuner unit 1. A SAW filter 2 as a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected in step 1 and extracting only the video intermediate frequency signal, a video intermediate frequency amplifier unit 3 for amplifying the video intermediate frequency, A video detector 4 for detecting an intermediate frequency signal and extracting a color video signal, a 4.5 MHz trap unit 5 for removing an audio intermediate frequency signal remaining in the color video signal, and a frequency characteristic of the color video signal 5MH as a means to change
z trap unit 10, a YC separation unit 6 for separating the optimized color video signal into a luminance signal and a chrominance signal, a luminance amplification unit 7 for amplifying the luminance signal, and a color amplification unit for amplifying the color signal This is a television receiver including a unit 8.

OFDM is placed on the upper adjacent channel of the analog broadcast wave.
When a digital broadcasting wave of the modulation method is located and an analog broadcasting wave is received by the television receiver, a mixed analog / digital broadcasting wave input from the antenna is desired by the local frequency signal of the tuning control unit in the tuner unit. Is converted to an intermediate frequency signal, and unnecessary signals other than the intermediate frequency signal band are removed by a SAW filter, and then converted to a color video signal by a video detector. Since the color video signal contains an audio signal having a center frequency of 4.5 MHz, the audio signal is removed by a 4.5 MHz trap circuit.
Further, an unnecessary signal component mixed in the color video signal band from 4.5 MHz to 6 MHz from the digital signal of the upper adjacent channel is removed by the 5 MHz trap circuit. Thereafter, the signal is separated into a luminance signal and a chrominance signal by a YC separation unit, and the luminance signal and the chrominance signal are input to the respective amplification units.

(Embodiment 2) Embodiments of the present invention described in claims 1 and 2 and claim 4 of the present invention will be described below with reference to FIG.

FIG. 2 shows a tuner unit 1 for selecting a desired received broadcast wave signal from broadcast wave signals received from an antenna, a tuning control unit 9 for controlling a tuning operation of the tuner 1, SAW filter 2 serving as a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected by tuner unit 1 and extracting only a video intermediate frequency signal
A video intermediate frequency amplifier unit 3 for amplifying the video intermediate frequency; a video detection unit 4 for detecting the video intermediate frequency signal and extracting a color video signal; and removing an audio intermediate frequency signal remaining in the color video signal. 4.5 as a means
MHz trap section 5, a frequency characteristic adjusting section 11 as a means for changing a frequency characteristic of the color video signal,
An external input unit 12 for externally controlling the frequency characteristic adjusting unit, a YC separating unit 6 for separating the adjusted color video signal into a luminance signal and a color signal, and a luminance amplifier for amplifying the luminance signal This is a television receiver comprising a unit 7 and a color amplifying unit 8 for amplifying the color signal.

OFDM is placed on the upper adjacent channel of the analog broadcast wave.
When a digital broadcasting wave of the modulation method is located and an analog broadcasting wave is received by the television receiver, a mixed analog / digital broadcasting wave input from the antenna is desired by the local frequency signal of the tuning control unit in the tuner unit. Is converted to an intermediate frequency signal, and unnecessary signals other than the intermediate frequency signal band are removed by a SAW filter, and then converted to a color video signal by a video detector. Since the color video signal contains an audio signal having a center frequency of 4.5 MHz, the audio signal is removed by a 4.5 MHz trap circuit.
Further, by adjusting the frequency characteristic of the color video signal from an external interface, unnecessary signal components mixed into the color video signal band from 4.5 MHz to 6 MHz from the digital signal of the upper adjacent channel are reduced. Then Y
The luminance signal and the chrominance signal are separated by the C separation unit, and the luminance signal and the chrominance signal are input to the respective amplification units.

(Embodiment 3) Embodiments of the present invention described in claims 1, 2 and 5 of the present invention will be described below with reference to FIG.

FIG. 3 shows a tuner unit 1 for selecting a desired received broadcast wave signal from broadcast wave signals received from an antenna, a tuning control unit 9 for controlling a tuning operation of the tuner 1, SAW filter 2 serving as a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected by tuner unit 1 and extracting only a video intermediate frequency signal
A video intermediate frequency amplifier unit 3 for amplifying the video intermediate frequency; a video detection unit 4 for detecting the video intermediate frequency signal and extracting a color video signal; and removing an audio intermediate frequency signal remaining in the color video signal. 4.5 as a means
MHz trap section 5, a frequency characteristic adjusting section 11 as a means for changing a frequency characteristic of the color video signal,
A luminance signal frequency characteristic detecting unit 13 for controlling the frequency characteristic adjusting unit, a YC separating unit 6 for separating the optimized color video signal into a luminance signal and a color signal, and a luminance amplifier for amplifying the luminance signal This is a television receiver comprising a unit 7 and a color amplifying unit 8 for amplifying the color signal.

OFDM is placed on the upper adjacent channel of the analog broadcast wave.
When a digital broadcasting wave of the modulation method is located and an analog broadcasting wave is received by the television receiver, a mixed analog / digital broadcasting wave input from the antenna is desired by the local frequency signal of the tuning control unit in the tuner unit. Is converted to an intermediate frequency signal, and unnecessary signals other than the intermediate frequency signal band are removed by a SAW filter, and then converted to a color video signal by a video detector. Since the color video signal contains an audio signal having a center frequency of 4.5 MHz, the audio signal is removed by a 4.5 MHz trap circuit.
Further, the color signal passes through the frequency characteristic adjustment unit, and thereafter is separated into a luminance signal and a chrominance signal by the YC separation unit, and the luminance signal and the chrominance signal are input to the respective amplification units. The luminance signal frequency characteristic detecting unit detects an unnecessary signal component mixed into the color video signal band from 4.5 MHz to 6 MHz from the digital signal of the upper adjacent channel from the luminance signal output from the luminance signal amplifying unit, and controls the frequency characteristic adjusting unit. Control optimally.

(Embodiment 4) Embodiments of the present invention described in claims 1, 2 and 6 of the present invention will be described below with reference to FIG.

FIG. 4 shows a tuner unit 1 for selecting a desired received broadcast wave signal from broadcast wave signals received from an antenna, a tuning control unit 9 for controlling a tuning operation of the tuner 1, SAW filter 2 serving as a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected by tuner unit 1 and extracting only a video intermediate frequency signal
A video intermediate frequency amplifier unit 3 for amplifying the video intermediate frequency; a video detection unit 4 for detecting the video intermediate frequency signal and extracting a color video signal; and removing an audio intermediate frequency signal remaining in the color video signal. 4.5 as a means
MHz trap unit 5, a YC separation unit 6 for separating the optimized color video signal into a luminance signal and a color signal, a luminance amplification unit 7 for amplifying the luminance signal, and a color amplification unit for amplifying the color signal This is a television receiver comprising a unit 8 and a luminance signal frequency characteristic detecting unit 13 for controlling the frequency characteristic adjusting unit.

OFDM is placed on the upper adjacent channel of the analog broadcast wave.
When a digital broadcasting wave of the modulation method is located and an analog broadcasting wave is received by the television receiver, a mixed analog / digital broadcasting wave input from the antenna is desired by the local frequency signal of the tuning control unit in the tuner unit. Is converted to an intermediate frequency signal, and unnecessary signals other than the intermediate frequency signal band are removed by a SAW filter, and then converted to a color video signal by a video detector. Since the color video signal contains an audio signal having a center frequency of 4.5 MHz, the audio signal is removed by a 4.5 MHz trap circuit.
After that, it is separated into a luminance signal and a chrominance signal by the YC separation unit,
The luminance signal and the chrominance signal are input to the respective amplifiers. The luminance signal frequency characteristic detector detects an unnecessary signal component mixed in the color video signal band from 4.5 MHz to 6 MHz from the luminance signal output from the luminance signal amplifier from the digital signal of the upper adjacent channel. The detection signal acts to change the local frequency of the tuning control unit and reduce unnecessary digital signal components mixed in the color video signal band from 4.5 MHz to 6 MHz.

(Embodiment 5) Embodiments of the present invention described in claims 7, 8 and 9 of the present invention will be described below with reference to FIG.

FIG. 5 shows a tuner section 1 for selecting a desired received broadcast wave signal from broadcast wave signals received from an antenna, a tuning control section 9 for controlling a tuning operation of the tuner 1, SAW filter 2 serving as a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected by tuner unit 1 and extracting only a video intermediate frequency signal
A video intermediate frequency amplifier unit 3 for amplifying the video intermediate frequency; a video detection unit 4 for detecting the video intermediate frequency signal and extracting a color video signal; and removing an audio intermediate frequency signal remaining in the color video signal. 4.5 as a means
MHz trap section 5, a frequency characteristic adjusting section 11 as a means for changing a frequency characteristic of the color video signal,
Adjustment: a YC separation section 6 for separating the optimized color video signal into a luminance signal and a color signal, a luminance amplification section 7 for amplifying the luminance signal, and a color amplification section 8 for amplifying the color signal
, A television receiver configured from a region information input device 15 for specifying a reception region and channel arrangement information 14.

OFDM is placed on the upper adjacent channel of the analog broadcast wave.
When a digital broadcasting wave of the modulation method is located and an analog broadcasting wave is received by the television receiver, a mixed analog / digital broadcasting wave input from the antenna is desired by the local frequency signal of the tuning control unit in the tuner unit. Is converted to an intermediate frequency signal, and unnecessary signals other than the intermediate frequency signal band are removed by a SAW filter, and then converted to a color video signal by a video detector. Since the color video signal contains an audio signal having a center frequency of 4.5 MHz, the audio signal is removed by a 4.5 MHz trap circuit.
Further, by adjusting the frequency characteristic of the color video signal from an external interface, unnecessary signal components mixed into the color video signal band from 4.5 MHz to 6 MHz from the digital signal of the upper adjacent channel are reduced. Then Y
The luminance signal and the chrominance signal are separated by the C separation unit, and the luminance signal and the chrominance signal are input to the respective amplification units. The area input device is used to input the postal area code and the like for the receiving area. The channel arrangement information section table composed of the memory receives the arrangement of analog broadcast waves and digital broadcast waves at the reception position from the input postal code etc. Make the machine aware. If a digital broadcast wave is present in an upper adjacent channel of the analog broadcast wave of the reception channel, the frequency characteristic adjusting unit is controlled to control the color video signal band to 4.5 MHz.
Unnecessary digital signal components to be mixed into 6 MHz are removed.

(Embodiment 6) Embodiments of the present invention described in claims 7, 8 and 10 of the present invention will be described below with reference to FIG.

FIG. 6 shows a tuner unit 1 for selecting a desired received broadcast wave signal from broadcast wave signals received from an antenna, a tuning control unit 9 for controlling a tuning operation of the tuner 1, SAW filter 2 serving as a band-pass filter for removing an audio intermediate signal from the intermediate frequency signal selected by tuner unit 1 and extracting only a video intermediate frequency signal
A video intermediate frequency amplifier unit 3 for amplifying the video intermediate frequency; a video detection unit 4 for detecting the video intermediate frequency signal and extracting a color video signal; and removing an audio intermediate frequency signal remaining in the color video signal. 4.5 as a means
MHz trap unit 5 and adjustment YC separation unit 6 for separating the optimized color video signal into a luminance signal and a chrominance signal
A television receiver comprising: a luminance amplifier 7 for amplifying the luminance signal; a color amplifier 8 for amplifying the color signal; a region information input device 15 for specifying a reception region; It is.

[0036] OFDM is added to the upper adjacent channel of the analog broadcast wave.
When a digital broadcasting wave of the modulation method is located and an analog broadcasting wave is received by the television receiver, a mixed analog / digital broadcasting wave input from the antenna is desired by the local frequency signal of the tuning control unit in the tuner unit. Is converted to an intermediate frequency signal, and unnecessary signals other than the intermediate frequency signal band are removed by a SAW filter, and then converted to a color video signal by a video detector. Since the color video signal contains an audio signal having a center frequency of 4.5 MHz, the audio signal is removed by a 4.5 MHz trap circuit.

Thereafter, the luminance signal and the chrominance signal are separated by the YC separation unit, and the luminance signal and the chrominance signal are input to the respective amplification units. The regional input device is used to input the postal area code etc. of the receiving area, and the arrangement of analog broadcast waves and digital broadcast waves at the receiving position is received from the input postal code etc. by the channel arrangement information section table composed of memory Make the machine aware. Then, when a digital broadcast wave exists in the upper adjacent channel of the analog broadcast wave of the reception channel, the local frequency of the channel selection control unit is changed,
It acts to reduce unnecessary digital signal components mixed in the color video signal band from 4.5 MHz to 6 MHz.

[0038]

As described above, according to the television receiver of the present invention, digital broadcasting and analog broadcasting are mixed.
In a region where a digital broadcast wave is arranged in a channel adjacent to an analog broadcast wave, especially when a digital broadcast wave is located in an upper adjacent channel of the analog broadcast wave, the signal of the digital broadcast wave leaks into the band of the analog broadcast wave. It is possible to improve the deterioration of the reception state of the analog broadcast due to the interference of the digital broadcast wave signal to be embedded.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a television receiver according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a television receiver according to the embodiment of the invention.

FIG. 3 is a configuration diagram of a television receiver according to the embodiment of the invention.

FIG. 4 is a configuration diagram of a television receiver according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a television receiver according to an embodiment of the present invention.

FIG. 6 is a configuration diagram of a television receiver according to an embodiment of the present invention.

FIG. 7 is a diagram showing a conventional example of a television receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tuner part 2 SAW filter part 3 Video intermediate frequency signal (VIF) amplification part 4 Video detection part 5 4.5 MHz trap part 6 YC separation part 7 Luminance signal amplification part 8 Color signal amplification part 9 Tuning control part 10 5 MHz trap part Reference Signs List 11 frequency characteristic adjustment unit 12 external input unit 13 luminance signal frequency characteristic detection unit 14 channel arrangement information holding unit 15 area information input unit

Continued on the front page F-term (reference)

Claims (10)

[Claims] An analog broadcast and a digital broadcast are simultaneously provided, and when an analog broadcast is viewed in an environment area where a digital broadcast physical channel is arranged in an upper adjacent channel of the analog broadcast physical channel, a reception state is detected. A television receiving apparatus for optimally adjusting a received analog video signal characteristic according to the state. 2. A television receiver according to claim 1, further comprising: a tuner device for selecting a desired received broadcast wave signal from a broadcast wave signal received from an antenna; and a tuning control device for controlling a tuning operation of said tuner. A band-pass filter that removes an audio intermediate signal from an intermediate frequency signal selected by the tuner device and extracts only a video intermediate frequency signal, a video intermediate frequency amplifier that amplifies the video intermediate frequency, and the video intermediate frequency signal A detection device for detecting a color video signal, detecting a sound intermediate frequency signal remaining in the color video signal, a device for changing a frequency characteristic of the color video signal, and the optimized color video signal. YC separation means for separating a color signal into a luminance signal and a color signal, a luminance amplification device for amplifying the luminance signal, and a color for amplifying the color signal. A television receiver comprising an amplifying device and optimizing a received analog video signal characteristic depending on a state of deterioration of an image. 3. The television receiver according to claim 2, wherein the means for removing the audio intermediate frequency signal remaining in the color video signal includes a trap filter having a center frequency of 4.5 MHz and a trap filter having a center frequency of 4.5 MHz or more. A television receiver comprising a cascade connection of the above. 4. The television receiver according to claim 2, further comprising a frequency characteristic variable device that can be manually adjusted from outside as means for changing the frequency characteristic of the color video signal. apparatus. 5. The television receiver according to claim 2, further comprising a frequency characteristic variable device that can be automatically adjusted by a reception state detection signal or the like as means for changing the frequency characteristic of the color video signal. Television receiver. 6. The television receiving apparatus according to claim 2, wherein the tuning control apparatus automatically controls a tuning frequency of a tuner based on a detection signal of a receiving state and optimizes a receiving state. Television receiver. 7. When an analog broadcast and a digital broadcast are simultaneously provided and an analog broadcast is viewed in an environment area where a digital broadcast physical channel is arranged in an upper adjacent channel of the analog broadcast physical channel, a reception area is specified. Thus, a television receiving apparatus that sets optimal receiving characteristics for the area. 8. A television receiver according to claim 7, further comprising: a tuner device for selecting a desired received broadcast wave signal from a broadcast wave signal received from an antenna; and a tuning control device for controlling a tuning operation of said tuner. A band-pass filter that removes an audio intermediate signal from an intermediate frequency signal selected by the tuner device and extracts only a video intermediate frequency signal, a video intermediate frequency amplifier that amplifies the video intermediate frequency, and the video intermediate frequency signal A detection device for detecting a color video signal by detecting the color video signal; a unit for removing an audio intermediate frequency signal remaining in the color video signal; and a YC separation unit for separating a luminance signal and a color signal from the optimized color video signal. A luminance amplifying device for amplifying the luminance signal, a color amplifying device for amplifying the color signal, and a received analog video signal based on reception area information. Television receiver, characterized in that having means to optimize the sex. 9. The television receiving apparatus according to claim 8, wherein the means for optimizing the received analog video signal characteristics is a device for storing channel arrangement information by inputting reception area information, to obtain an optimum reception in that area. A television receiver, wherein a control signal is sent to the frequency characteristic adjusting section so that analog video signal characteristics can be automatically optimized. 10. The television receiving apparatus according to claim 8, wherein the means for optimizing the received analog video signal characteristics is characterized in that the apparatus for storing the channel arrangement information by inputting the receiving area information, A television receiving apparatus, wherein a control signal is sent to the channel selection control unit so that analog signal characteristics can be automatically optimized.