JPH03204287A - Television receiver - Google Patents

Abstract

PURPOSE:To quicken the signal discrimination including discrimination of absence of received broadcast by providing a BS discrimination means discriminating the system of the received broadcast signal based on the result of detection with a BS reception broadcast presence detection section and a carrier presence detection section. CONSTITUTION:When a channel selection signal is outputted to a BS tuner section 2 by a channel selection means 3, the BS tuner section 2 is operated to receive a signal of a prescribed frequency (channel) signal and when a reception signal is in existence, a reception signal is outputted to a MUSE decoder 4, an NTSC decoder 5 and a PCM decoder 6 or the like. Then an AGC output of the BS tuner section 2 is led to a BS reception broadcast presence detection section 7 and an audio signal inputted to a PCM decoder 6 is led respectively to a carrier presence detection section 8 and a BS discrimination means 10 outputs a discrimination signal based on the output state of carrier detection sections 7, 8. In this case, the presence of received broadcast and the presence of a carrier of the audio signal are detected at a high speed (nearly 10msec). Thus, the signal is discriminated at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a television receiving device that receives satellite broadcasting or both satellite broadcasting and regular broadcasting. Related to discrimination technology.

[Summary of the Invention] The first invention has a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal, and determines whether or not the BS tuner section is receiving broadcasts and the standard television signal. By detecting the presence or absence of a carrier in the included audio signal and determining the signal format from the detection results of both, devices that receive satellite broadcasting can quickly perform signal discrimination, including determining whether or not a broadcast is being received. be.

The second invention has a BS tuner unit that receives a standard television signal of satellite broadcasting and a compressed band television signal, and it is possible to determine whether or not the BS tuner unit is receiving broadcasts and to determine whether or not the audio signal included in the standard television signal is received by the BS tuner unit. Detects the presence or absence of a carrier and the lock/unlock state of a PLL circuit built in a decoder section that demodulates a band compression type television signal,
The broadcast signal system is provisionally determined based on the detection results of the presence or absence of BS reception broadcasting and the presence or absence of a carrier, and the PLL is applied to this detection result.
By adding the detection results of the locked/unlocked state of the circuit and finally determining the format of the broadcast signal, devices that receive satellite broadcasts can quickly perform signal discrimination, including determining whether or not the broadcast is being received. At the same time, accurate signal discrimination results can be obtained afterwards.

A third invention includes a BS tuner section that receives a standard television signal of satellite broadcasting and a band compression type television resin signal;
and a U/V tuner section that receives a standard television signal of normal broadcasting, and detects the presence or absence of a broadcast received by the BS tuner section and the presence or absence of a carrier of an audio signal included in the standard television signal, and detects both. A BS discriminating means for discriminating the signal system from the result is provided, and a U/V discriminating means for detecting the presence or absence of broadcasting received by the U/V tuner section is provided, and the BS discriminating means and the BS discriminating means are provided according to the channel selection state. In a device that receives both satellite broadcasting and regular broadcasting by selecting the discrimination result of the U/V discrimination means,
This enables high-speed signal discrimination, including the determination of whether or not there is a received broadcast.

A fourth invention includes a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal;
and a U/V tuner section that receives a standard television signal of normal broadcasting, and the BS tuner section has a U/V tuner section that receives a standard television signal for regular broadcasting, and detects the presence or absence of a broadcast received by the BS tuner section, the presence or absence of a carrier for an audio signal included in the standard television signal, and a band compression type television signal. The locked/unlocked state of the PLL circuit built in the demodulating decoder section is detected, the broadcast signal format is provisionally determined from the detection results of the presence or absence of BS reception broadcasting and the presence or absence of carrier, and the PLL circuit is applied to this detection result. A BS discrimination means is provided for finally determining the format of the broadcast signal by adding the detection results of the lock/unlock state of the circuit, and a U/V discrimination means for detecting the presence or absence of broadcast reception by the U/V tuner section. In the apparatus for receiving both satellite broadcasting and regular broadcasting, by providing means and selecting the discrimination results of the BS discrimination means and the U/V discrimination means according to the channel selection state,
It is possible to perform signal discrimination at high speed, including determining whether there is no received broadcast, and to obtain accurate signal discrimination results thereafter.

[Prior art] Current satellite broadcasting uses the standard television signal system, NT.
It is currently broadcast using the SC system, but in a few years, broadcasting using the MUSE system, which is a compressed band television signal system, will begin.

At the beginning of broadcasting, there were few MUSE format software, so MUSE
It will be broadcast in both USE and NTSC formats. Since these two methods have almost no compatibility, it is necessary to vary data such as screen deflection size and deflection frequency based on the received broadcasting method, and the broadcasting signal method must be determined.

As a means for determining the format of this broadcast signal, the applicant has previously proposed a means for detecting and determining the locked/unlocked state of a PLL (phase locked loop) circuit built into a MUSE decoder that demodulates the MUSE signal. did.

[Problems to be Solved by the Invention] However, while the MUSE method has the advantage of being able to accurately determine whether the PLL circuit is locked or unlocked, it has the disadvantage of slow response speed. There is.

Therefore, for example, when selecting a TV channel using the up and down keys, it is usually 600 ll1r;ec~8
Channel scanning is performed while maintaining a wait time of 00 m5ec, but the pull-in time until the PLL circuit becomes locked is 2 to 3 seconds in the worst case, resulting in MUS
Sometimes it is determined that the signal is not E and cannot catch the MUSE broadcast channel.

Furthermore, if there is no received broadcast, it is preferable to display the relevant channel on the screen, but it is impossible to distinguish between the NTSC system and no received broadcast by detecting only the locked/unlocked state of the PLL circuit.

Even in a television receiving apparatus that can receive both satellite broadcasting and regular broadcasting, there is a similar problem as described above because it is necessary to discriminate the format of the broadcasting signal.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a television receiving device that can quickly perform signal discrimination, including determining whether or not a broadcast is being received, in a device that receives satellite broadcasting or both satellite broadcasting and regular broadcasting. Further, the present invention is a device that receives satellite broadcasting or both satellite broadcasting and regular broadcasting, and can perform signal discrimination at high speed, including determining whether or not there is a received broadcast, and can also obtain accurate signal discrimination results after that. The purpose of the present invention is to provide a television receiving device.

[Means for Solving the Problems] A television receiving device according to a first invention for achieving the above object includes a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal;
A BS reception broadcast presence/absence detection section that detects the presence/absence of a received broadcast of the BS tuner section, and a carrier presence/absence detection section that detects the presence/absence of a carrier in an audio signal included in the standard television signal outputted by the BS tuner section. and BS determining means for determining the system of the received broadcast signal based on the detection results of the BS reception broadcast presence/absence detection section and the carrier presence/absence detection section.

A television receiving device according to a second invention for achieving the above object includes a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal;
a decoder section that demodulates the compressed band television signal received by the BS tuner section; a BS reception broadcast presence/absence detection section that detects the presence/absence of a broadcast received by the BS tuner section; and a standard output from the BS tuner section. A carrier presence/absence detection unit that detects the presence/absence of a carrier in an audio signal included in the television signal, and a PLL circuit that detects the locked/unlocked state of a PLL circuit built in the decoder unit.
The system of the received broadcast signal is provisionally determined based on the detection results of the lock/unlock detector, the BS reception broadcast presence/absence detection section, and the carrier presence/absence detection section, and the PLL lock/unlock/unlock signal is determined based on the two detection results. The system is equipped with a BS determining means that adds the detection result of the unlock detecting section to finally determine the format of the broadcast signal.

A television receiving device according to a third aspect of the invention for achieving the above object includes a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal;
a U/V tuner section that receives a standard television signal of normal broadcast; a BS reception broadcast presence/absence detection section that detects the presence/absence of a reception broadcast of the BS tuner section; and a standard television signal outputted by the BS tuner section. a carrier presence/absence detection unit that detects the presence/absence of a carrier in an audio signal included in the BS, and a BS that determines the format of the received broadcast signal based on the detection results of the BS reception broadcast presence/absence detection unit and the carrier presence/absence detection unit. and U/V discrimination means for detecting the presence/absence of a broadcast received by the U/V tuner section;
It is provided with a selection means for selecting the discrimination results of the BS discrimination means and the Moeki U/V discrimination means according to the channel selection state of satellite broadcasting or normal broadcasting.

A television receiving device according to a fourth invention for achieving the above object includes a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal;
A U/V tuner section that receives a standard television signal of normal broadcasting, a decoder section that demodulates the compressed band television signal received by the BS tuner section, and detects whether or not there is a broadcast received by the BS tuner section. a carrier presence/absence detection section that detects the presence/absence of a carrier in an audio signal included in the standard television signal output by the Fuki BS tuner section, and a PLL circuit built in the decoder section. a PLL lock/unlock detector for detecting a lock/unlock state of the receiver, a PLL lock/unlock detector for detecting a lock/unlock state of the receiver, a BS reception broadcast presence/absence detector, and a carrier presence/absence detector to temporarily determine the format of the received broadcast signal. ,
BS discriminating means for adding the detection result of the PLL lock/unlock detector to the two detection results to finally determine the format of the broadcast signal; The apparatus includes an UlV discrimination means for detecting, and a selection means for selecting the discrimination results of the BS discrimination means and the U/V discrimination means according to the channel selection state of satellite broadcasting or normal broadcasting.

[According to the first invention, the presence or absence of received broadcasting is determined by, for example, B
By detecting the level of the auto gain control signal built into the S tuner section, the presence or absence of a carrier in an audio signal can be detected, for example, by detecting the output of a bandpass filter. If there is a received broadcast and no carrier, it is the MUSE method, if there is a received broadcast and the carrier is growing, it is the NTSC method, and if there is no received broadcast, it is determined that there is no received broadcast. Therefore, a device that receives satellite broadcasting can quickly perform signal discrimination, including determining whether or not there is a received broadcast.

According to the second invention, the presence or absence of received broadcasting is determined by, for example, B
By detecting the level of the auto gain control signal built into the S tuner section, the presence or absence of a carrier in an audio signal can be detected, for example, by detecting the output of a bandpass filter. In addition to obtaining the detection result of the presence or absence of a received broadcast, it is determined that the MUSE method is used when there is a received broadcast and no carrier, the NTSC method is determined when there is a received broadcast and a carrier, and there is no received broadcast when there is no received broadcast. Therefore, in a device that receives satellite broadcasting, it is possible to quickly perform signal discrimination including determining whether there is no received broadcast, and the detection result of the locked/unlocked state of the PLL circuit is added after the above detection result for discrimination. Therefore, it is possible to know whether the above-mentioned discrimination result is an erroneous detection result due to a weak electric field, interfering radio waves, etc., and an accurate discrimination result can be obtained.

According to the third invention, as shown in the operation of the first invention, the signal system on the satellite broadcasting side can be determined, and the presence or absence of received broadcasting on the normal broadcasting side can also be detected in the same way. In a device that receives both broadcasts, it is possible to quickly perform signal discrimination, including determining whether or not there is a received broadcast.

According to the fourth invention, as shown in the operation of the second invention, the signal system on the satellite broadcasting side can be determined, and the presence or absence of received broadcasting on the normal broadcasting side can also be detected in the same way. In a device that receives both broadcasts, it is possible to perform signal discrimination at high speed, including the determination that there is no received broadcast, and the above discrimination is performed by adding the detection result of the lock/unlock state of the PLL circuit after the above detection result. It is possible to know whether the result is an erroneous detection result due to a weak electric field, interfering radio waves, etc., and accurate discrimination results can be obtained.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment to which the first invention is applied.

FIG. 1 shows a circuit block diagram of a television receiver. In FIG. 1, the output of a BS antenna l is guided to a BS tuner section 2. BS tuner section 2
receives both the MUSE system, which is a band compression type television broadcast signal, and the NTSC system, which is a standard television broadcast signal, and selects the desired frequency (desired channel) based on the tuning signal sent from the tuning means 3. Pick up the signal. The output of this BS tuner section 2 is led to a MUSE decoder 4, an NTSC decoder 5, and a PCM decoder 6, respectively. MUSE decoder 4 detects the human signal as MU
The built-in PLL circuit determines whether it is the SE method or not, and the MUSE
If it is a method, input signals are red (R), green (G), and blue (B).
demodulates into each color signal and outputs it. Further, a MUSE-VTR 15, which is an externally connected device, is connected to this MUSE decoder 4. The input signal of the NTSC decoder 5 is NT
In the case of the SC method, a human signal is demodulated into a signal consisting of a luminance signal (Y) and two color difference signals (RY) (B-Y) multiplied by a predetermined coefficient and output.

The PCM decoder 6 demodulates and outputs a satellite broadcast NTSC audio signal (PCM signal, 4-phase PSK system).

Note that the MUSE audio signal is demodulated by an audio decoder (not shown).

Further, the television receiving apparatus is provided with two detection sections, a BS reception broadcast presence/absence detection section 7 and a carrier presence/absence detection section 8 . The BS reception broadcast presence/absence detection section 7 is the BS tuner section 2
It detects the presence/absence of received broadcasts, and its specific configuration is shown in FIGS. 2 and 3.

In FIG. 2, the received broadcast presence/absence detection section 7 is composed of a comparator 11. The input terminal of this comparator 11 has B
The output voltage of an auto gain control (AGC) circuit built into the S tuner section 2 is led, and a reference voltage is led to one input terminal of the comparator II. Therefore, when there is a received broadcast on the BS tuner Ig52, the AGC voltage becomes higher than the reference voltage and the comparator 11 outputs an H signal, and when there is no received broadcast, the ACC voltage is lower than the reference voltage and the comparator 11 outputs an L signal. It is output to the BS discrimination means lO.

In FIG. 3, the received broadcast presence/absence detection section 7 is composed of a low band pass filter 12, a high band pass filter 13, and a comparator 14. Low band pass filter 1
2 and the high band pass filter 13 are the BS tuner section 7.
The demodulated signal which is the output of is guided. The pass band of the low band pass filter 12 is set to the frequency bands of both the MUSE signal and the NTSC signal, and the pass band of the high band pass filter 13 is set to a higher frequency band with no signal. The output of the high band pass filter 12 is led to an input terminal of a comparator 14, and the output of the low band pass filter 13 is led to one input terminal of the comparator 14.

When there is a received broadcast in the tuner section 2, the output voltage of the reduction band-pass filter 12 becomes higher than the output voltage of the high band-pass filter 13, so the comparator 14 outputs an H signal. Since the output voltage has the same value as the output voltage of the high band pass filter 13, the comparator 14 outputs an L signal to the BS discrimination means IO.

Returning to FIG. 1 again, the carrier presence/absence detecting section 8 has, for example, N
It has a bandpass filter whose passband is the carrier frequency band of the TSC audio signal. An audio signal is input from the PCM decoder 6 to this bandpass filter, and if the carrier is continuously output from the output of the bandpass filter, an H signal is output, and if the carrier is not continuously output, an L signal is output. It is output to the BS discrimination means lO. Based on the above output signal, the BS discrimination means 10 outputs the discrimination signals shown in Table 1 below to the MUS of the deflection control circuit, etc.
In the E method and the NTSC method, offset data is output to different circuits.

(Left below) <Table 1> In the above configuration, the channel selection means 3 selects the channel selection signal from BS.
When the signal is output to the tuner section 2, the BS tuner section 2 operates to receive the signal of a predetermined frequency (channel), and if there is a received signal, the received signal is sent to the MUSE decoder 4, the NTS
It is output to the C decoder 5, pcM decoder 6, etc. Then, the AGC output of the BS tuner section 2 is guided to the BS reception broadcast presence/absence detection section 7, and the audio signal input to the PCM decoder 6 is guided to the carrier presence/absence detection section 8. Then, the BS discrimination means 10 outputs a discrimination signal. In the above operation, the presence/absence of received broadcasting and the presence/absence of audio signal carrier are both at high speed (1
Since it can be detected at a speed of about 0 m5ec), it is possible to identify signals at high speed.

A second embodiment to which the second invention is applied is obtained by adding a PLL lock/unlock detector 9 shown by a two-dot chain line to the circuit block diagram of FIG. 1. That is, in addition to the BS reception broadcast presence/absence detection section 7 and the carrier presence/absence detection section 8, a PLL lock/
It has an unlock detection section 9. This PLL lock/unlock detection section 9 has, for example, a comparator, and this comparator has M
The output of the PLL circuit built into the USE decoder 4 is guided. Then, when the PLL circuit is in the locked state, the H signal is sent to the BS, and when the PLL circuit is in the unlocked state, the L signal is sent to the BS.
output to the use discrimination means lO. The BS discriminating means IO outputs the discriminating signal shown in Table 1 above based on the output signals of the BS reception broadcast presence/absence detecting section 7 and the carrier presence/absence detecting section 8 that are initially sent.

Then, by adding the output signal of the PLL lock/unlock detector 9 sent later, the determination signal shown in Table 2 below is output again.

Table 2> In the above configuration, the channel selection means 3 selects the channel selection signal from the BS.
When output to tuner section 2, it operates in the same way as above and B
The AGC output of the S tuner section 2 is sent to the BS reception broadcast presence detection section 7, the audio signal input to the PCM decoder 6 is sent to the carrier presence detection section 8, and the output of the PLL circuit of the MUSE decoder 4 is sent to the PLL lock/unlock detection section. 9 respectively.

The outputs of the BS reception broadcast presence/absence detecting section 7 and the carrier presence/absence detecting section 8, which are detected at high speed, are first sent to the BS discriminating means IO, which outputs a provisional discriminating signal according to these output states. And 600 asec~800 a+sec
PLL lock/unlock detector 9 that takes time to detect
The output of is sent next, and a discrimination signal obtained by adding this detection result to the above detection result is output. The BS reception broadcast presence/absence detection section 7 detects the AGC voltage, and the carrier presence/absence detection section 8 detects the presence or absence of a carrier, so they may malfunction due to interference radio waves, but the PLL lock/unlock detection section 9 is resistant to interference radio waves. In order to accurately determine whether the system is compatible or not, a tentative signal discrimination result can be obtained at high speed, and an accurate discrimination result can be obtained thereafter.

4 to 7 show a third embodiment to which the third invention is applied. Components that are the same as those in the first embodiment are given the same reference numerals in the drawings, and their explanation will be omitted, and only the different components will be explained. That is, in addition to the satellite broadcast receiving system, it also has a normal broadcast receiving system, and the output of the U/V antenna 16 is guided to the U/V tuner section 17. The U/V tuner section 17 receives the NTSC system of normal broadcasting, and receives a signal of a desired frequency (channel) based on a tuning signal sent from the tuning means 3. The output of the U/V tuner section 17 is led to the NTSC decoder 5 via a changeover switch SWI. This changeover switch SW selectively changes between satellite broadcasting and regular broadcasting, and is controlled by a switching signal from the channel selection means 3.

The output of the NTSC decoder 5 is guided to a changeover switch SWt, which changes the output signal to
The video signal output by the SC decoder 5 or the synchronization signal output by the internal synchronization signal generator 18 is switched. This changeover switch SW switches to the internal synchronization signal generator ls side if the signal sent via the changeover switch SW described below indicates no broadcast signal, and otherwise switches to the NTSC decoder 5 side. Switch position.

Further, the output of the U/V tuner section 17 is transmitted to the synchronous separation circuit 19.
I am also guided by The synchronization separation circuit I9 separates the synchronization signals (vertical synchronization signal, horizontal synchronization signal) in the video signal and sends them to U/
It is output to the V discrimination means 20. The U/V discrimination means 20 detects whether or not there is a received broadcast in the U/V tuner section 17, and its specific configuration is shown in FIGS. 5 and 6, respectively.

In FIG. 5, the U/V discrimination means 20 is composed of a CPU 2M, a counter 22, and a memory 23. C.P.
U21 has extraction means and identification means. The extracting means extracts the horizontal synchronizing signal H in a period other than the vertical synchronizing signal V and having a period less than the period of the vertical synchronizing signal, for example, 2 m5ec, and repeats this at regular intervals. Horizontal synchronization signal H extracted by extraction means
is sent to the counter 22, and the counter 22 counts the number of horizontal synchronization signals H. The count value of the counter 22 is written into the memory 23, and the identification means reads the count value of the memory 23 to determine the presence or absence of a received signal. 2
If the number of pulses of the horizontal synchronizing signal H between asec is within 30 to 35, it is determined that it is an NTSC system, and if it is not, it is determined that there is no broadcasting signal, and a determination signal indicating this determination result is sent to the switching terminal a of the changeover switch SWv. being guided.

FIG. 6 shows another embodiment of the chopstick/V discrimination means 20. In FIG. A time chart diagram of each part of this circuit block is shown in FIG. The U/V discrimination means 20 includes extraction means 24, to which a vertical synchronization signal V and a horizontal synchronization signal H are respectively guided. The extraction means 24 consists of a timer circuit 25 and an AND circuit 26, and the vertical synchronization signal V is manually input to the timer circuit 25. A clock obtained by dividing the oscillation frequency of the oscillator 27 by a frequency divider 28 is input to the timer circuit 25. When the timer circuit 25 receives the vertical synchronization signal V, it switches its output from an H signal to an OFF signal and starts counting the clock, and when a predetermined count is reached, it is reset and switches its output from an L signal to an H signal. That is, the L signal is output only during the period T of the vertical synchronization signal. The AND circuit 26 receives the horizontal synchronizing signal H, and the timer circuit 26 receives the horizontal synchronizing signal H, the output of the timer circuit 25, and a pulse signal obtained by dividing the oscillation frequency of the oscillator 27 by a frequency divider 29, respectively. . The pulse width T of this pulse signal is approximately 2
It is set to m5ec. Since the AND circuit 26 takes the AND condition of the input signal, 2
Outputs the horizontal synchronization signal H input during m5ec.

The output of this AND circuit 26 is input to a counter 30. The output of the frequency divider 29 is led to the counter 30, which starts counting at the rising edge of this output signal, resets at the falling edge, and outputs the count value immediately before the reset to the identifying means 31. The identification means 3I has a plurality of digital comparators, and determines whether or not there is a broadcast signal based on the count value in substantially the same manner as described above, and a determination signal indicating the determination result is sent to the switching terminal a of the changeover switch SWs. guided by. It should be noted that the present invention may be configured to detect the presence or absence of a broadcast signal for normal broadcasting by means shown in FIGS. 2 and 3 of the first embodiment, respectively.

The discrimination signal of the BS discrimination means 10 is led to the other switching terminal of the changeover switch SW.
3, the outputs of the two discrimination means 10 and 20 are selectively switched. The output of this changeover switch SWs is guided as a changeover signal to another changeover switch SW, and in the MUSE system and the NTSC system, offset data is also led to various circuits different from each other. Similar to the first embodiment, the tuning means 3 outputs a tuning signal to the BS tuner section 2 or the U/V/V tuner 7 in response to a tuning command from the user, and also outputs a tuning signal between satellite broadcasting and normal broadcasting. A signal indicating whether broadcasting has been selected is output to the two changeover switches sw, , sw, respectively.

In the above configuration, when the user selects an arbitrary channel of satellite broadcasting, the channel selection means 3 outputs a channel selection signal to the BS tuner unit 2, and a signal indicating that the satellite broadcasting has been selected is sent to the selector switch SW1. Output to S W s. Then, as shown in FIG. 4, the changeover switch SW1 is placed on the BS tuner section 2 side, and the changeover switch SWs is placed on the BS discrimination means 1 side.
They can each be switched to the 0 side. Since the received signal can be discriminated by the same effect as in the first embodiment, the signal can be discriminated at high speed.

Further, when the user selects an arbitrary channel of normal broadcasting, the channel selection means 3 outputs a channel selection signal to the U/V/V tuner 7, and also sends a signal indicating that normal broadcasting has been selected to the changeover switches SW+, Sw. Output to. Then, changeover switch SW1 or U/V tuner section 1 side changeover switch SW
3 are respectively switched to the U/V discrimination means 20 side. Then, the U/V discrimination means 20 detects the presence or absence of a broadcast signal. This U/V discriminating means 20 is capable of high-speed signal discriminating in order to detect broadcast signals at high speed as described above. Moreover, the BS discrimination means 10 or the U/V discrimination means 20
When outputs a discrimination signal indicating that there is no broadcast signal, the selector switch SW is switched to the internal synchronization signal generator 18 side and a synchronization signal is output. This synchronization signal causes a screen display such as "No broadcast signal" to be displayed.

A fourth embodiment to which the fourth invention is applied is obtained by adding a PLL lock/unlock detector 9 shown by a two-dot chain line to the circuit block diagram of FIG. 4. The BS discrimination means 10 is configured to perform the same operation as that of the second embodiment.

In this fourth embodiment, the overall general operation is almost the same as in the third embodiment, and when satellite broadcasting is selected, the BS discriminating means IO performs the discriminating operation as shown in the second embodiment.
is executed. Therefore, for both satellite broadcasting and regular broadcasting, signal discrimination including determination of whether or not there is a received broadcast can be made at high speed, and accurate discrimination results can be obtained after the above discrimination results.

[Effects of the Invention] As described above, the first to fourth inventions have the following effects.

That is, according to the first invention, there is provided a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal, and whether or not the BS tuner section receives broadcasts and is included in the standard television signal. Since the presence or absence of a carrier in the audio signal being received is detected and the signal system is determined from the detection results of both, a device for receiving satellite broadcasting can quickly perform signal discrimination including determining whether there is no received broadcasting.

According to the second invention, there is provided a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal, and it is possible to determine whether or not the BS tuner section is receiving broadcasts and the sound included in the standard television signal. The presence or absence of a signal carrier and the locked/unlocked state of the PLL circuit built into the decoder section that demodulates the band compression type television signal are detected, and the broadcast signal is detected based on the detection results of the presence or absence of BS reception broadcasting and the presence or absence of the carrier. The system was tentatively determined, and the system of the broadcast signal was finally determined by adding the detection result of the locked/unlocked state of the PLL circuit to this detection result. It is possible to perform signal discrimination at high speed, including determination of whether the signal is present or not, and to obtain accurate signal discrimination results thereafter.

According to the third invention, there is provided a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal, and a U/BS tuner section that receives a standard television signal of regular broadcasting.
and a V tuner section, detecting the presence or absence of a broadcast received by the BS tuner section and the presence or absence of a carrier for an audio signal included in a standard television signal, and determining the signal system from the detection results of both numbers. and a U/V discrimination means for detecting the presence or absence of a broadcast received by the U/V tuner section,
A device for receiving both satellite broadcasting and regular broadcasting by selecting the discrimination results of the BS discrimination means and the U/V discrimination means according to the channel selection state,
This enables high-speed signal discrimination, including the determination of whether or not there is a received broadcast.

According to the fourth invention, there is provided a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal, and a U/BS tuner section that receives a standard television signal of regular broadcasting.
V tuner unit, and locks the presence/absence of received broadcasting of the BS tuner unit, the presence/absence of a carrier for the audio signal included in the standard television signal, and the PLL circuit built in the decoder unit that demodulates the band compression type television signal.・Detect the unlock state, provisionally determine the broadcast signal system from the detection results of the presence or absence of BS reception broadcasting and the presence or absence of carrier, and add the detection result of the lock/unlock state of the PLL circuit to this detection result. BS that ultimately determines the format of the broadcast signal.
further comprising a U/V discrimination means for detecting the presence or absence of a broadcast received by the U/V tuner section, and a discrimination between the BS discrimination means and the U/V discrimination means according to the channel selection state. Since I have selected the result, I have a device that receives both satellite and regular broadcasts.
It is possible to perform signal discrimination at high speed, including determining whether there is no received broadcast, and to obtain accurate signal discrimination results thereafter.

[Brief explanation of drawings]

1 to 3 show first and second embodiments of the present invention, FIG. 1 is a circuit block diagram of a television receiver, and FIGS. 2 and 3 are circuits of a BS reception broadcast presence detection section. The block diagrams are shown respectively, and FIGS. 4 to 7 show the third embodiment of the present invention.
and a fourth embodiment, FIG. 4 is a circuit block diagram of a television receiver, and FIGS. 5 and 6 are U/V
FIG. 7 shows a circuit block diagram of the use discriminating means, and a time chart diagram. 2... BS tuner section, 7... BS reception broadcast presence/absence detection section, 8... Carrier presence/absence detection section, 9... PLL lock/unlock detection section, lO... BS discrimination means, 1
7... U/V tuner section, 20... U/V discrimination means, SW,... changeover switch (selection means). Noro? Figure 3

Claims (4)

[Claims] (1) A BS tuner unit that receives a standard television signal of satellite broadcasting and a compressed band television signal; a BS reception broadcast presence/absence detection unit that detects the presence or absence of a reception broadcast of the BS tuner unit; and the BS tuner a carrier presence/absence detection section that detects the presence/absence of a carrier in an audio signal included in the standard television signal outputted by the section; 1. A television receiving device comprising: BS discrimination means for discriminating the format of a broadcast signal. (2) a BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal; a decoder section that demodulates the compressed band television signal received by the BS tuner section; a BS reception broadcast presence/absence detection unit that detects the presence/absence of a received broadcast; a carrier presence/absence detection unit that detects the presence/absence of a carrier of an audio signal included in the standard television signal output by the BS tuner unit; and the decoder. a PLL lock/unlock detection section that detects the lock/unlock state of a PLL circuit built in the section; and a PLL lock/unlock detection section that detects the lock/unlock state of a PLL circuit built in the section; The method is tentatively determined, and the PLL lock is applied to the two detection results.
1. A television receiving device comprising: BS discriminating means for finally discriminating the format of a broadcast signal by adding the detection result of the unlock detecting section. (3) a BS tuner unit that receives standard television signals of satellite broadcasting and compressed band television signals; a U/V tuner unit that receives standard television signals of regular broadcast; a carrier presence/absence detection section that detects the presence/absence of a BS received broadcast; a carrier presence/absence detection section that detects the presence/absence of a carrier of an audio signal included in the standard television signal output by the BS tuner section; BS discriminating means for discriminating the format of the received broadcast signal based on the detection result of the detection unit and the carrier presence/absence detection unit; A television reception characterized by comprising: a determining means; and a selecting means for selecting the determination results of the BS determining means and the U/V determining means depending on the channel selection state of satellite broadcasting or regular broadcasting. Device. (4) A BS tuner section that receives a standard television signal of satellite broadcasting and a compressed band television signal, a U/V tuner section that receives a standard television signal of regular broadcasting, and the band received by the BS tuner section. a decoder section that demodulates a compressed television signal; a BS reception broadcast presence/absence detection section that detects the presence/absence of a reception broadcast of the BS tuner section; and an audio signal included in the standard television signal output from the BS tuner section. a carrier presence/absence detection section that detects the presence/absence of a carrier; a PLL lock/unlock detection section that detects the lock/unlock state of a PLL circuit built in the decoder section; and a BS reception broadcast presence/absence detection section. The format of the received broadcast signal is provisionally determined based on the detection result of the carrier presence/absence detection section, and the PLL lock/lock is applied to the two detection results.
BS discrimination means that adds the detection result of the unlock detection section to finally discriminate the format of the broadcast signal; and U/V discrimination means that detects whether there is a broadcast received by the U/V tuner section. 1. A television receiving apparatus comprising a selection means for selecting the determination result of the BS determination means and the U/V determination means depending on the channel selection state of satellite broadcasting or normal broadcasting.