CN85104465A

CN85104465A - Multistandard TV receiver

Info

Publication number: CN85104465A
Application number: CN85104465.4A
Authority: CN
Inventors: 加藤富夫
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 1984-11-13
Filing date: 1985-06-11
Publication date: 1986-05-10
Also published as: JPS6188378U; CN1009607B

Abstract

Multistandard TV receiver is applicable to the Phase Alternation Line system of reception with multiple different appendix wave frequencies, the TV signal of TSC-system and Sequential Color and Memory system.This receiver comprises frequency detection circuit, the frequency data (A) that are used to detect the appendix wave frequency of TV signal and produce the detected frequency of representative; The standard testing circuit, be used to detect the standard of TV signal and produce the detected standard of representative the standard data (B, C); Passage change testing circuit is used for the change of sense channel; Holding circuit is used for measuring holding frequency data and standard data on the basis that passage changes at testing circuit; Television circuit, it is according to frequency data and standard data and be provided with.

Description

Multistandard TV receiver

The present invention is about having the multistandard TV receiver of appendix wave producer circuit, and for some different systems, this generator is a practical.

, many dissimilar TV propagation systems are arranged in the world, such as the PAL system, SECAM system, NTSC system and other.Certain areas, the world has the television broadcasting of two or more systems, and is same, and the video tape recorder under different systems is arranged.

For the colour TV signal of the different systems of regenerating, be developed into a kind of can the reception and the color TV set of regenerating different system colour TV signals.This kind television receiver is called multistandard TV receiver.

The signal format of TSC-system formula and pal mode is very close, thus in multistandard TV receiver in the past, shared color-signal processing circuit, the phase detectors of automatic phase controller, and suppress phase detectors.In addition, multistandard TV receiver has checkout gear, detects the type of the television system that is receiving, so that change various circuit, needs with these circuit processing television signals to be become observable image in cathode ray tube.

For example, according to the PAL system, be the carrier wave of paying of 4.43MHZ with frequency in most of area, but some area usefulness 3.58MHZ appendix ripple, for the NTSC system, it is standard that 3.58MHZ pays carrier wave.In addition, the video tape recorder 3.58MHZ of some NTSC system, other uses 4.43MHZ appendix ripple.

Correspondingly, can receive Phase Alternation Line system and TSC-system TV signal in the past, the multi-system television machine that maybe can reproduce the video tape under the different systems adopts two oscillators, in order to produce the appendix ripple of two different frequency 4.43MHZ and 3.58MHZ, for this purpose, have suitable conversion equipment, select an oscillator for producing required appendix ripple.

Therefore, multistandard TV receiver in the past needs two oscillators, result, cost height, the equally also conversion equipment of selection oscillator that need be suitable.

In order to get rid of above-mentioned shortcoming, inventor of the present invention proposes a kind of multistandard TV receiver with improved appendix wave producer circuit, and it is revealed in the Japan Patent No.58-152070 that publishes.It transfers the surrenderee of present application.According to this publication 58-152070, only have an oscillator, it can produce the appendix ripple of different frequency, and automatically selects and produce pair carrier wave that is applicable to the TV signal that receives.The details of the appendix wave producer of publication number 58-152070 announcement is hereinafter described with Fig. 1.

In Fig. 1, consult burst gate of number 1 sign, according to the burst gate pulse in horizontal scanning period, it separates from carrier chrominance signal and produces the burst gate signal.Number 2 is the phase detectors that are used for automatic phase controller (APC), the 3rd, and low pass filter, the 4th, voltage controlled oscillator (VCO), these

circuit

2,3 and 4 are defined as the automatic phase controller, thereby VCO4 produces appendix ripple signal.

VCO4 has two crystal oscillator 5a and 5b, is used to produce the signal that frequency is 3.58MHZ and 4.43MHZ, for the frequency that responds burst signal also has switching circuit 6, is used for selectivity and connects a crystal oscillator to VCO4.

Also have phase detectors 7, be used to suppress circuit, when phase detectors 7 stop to produce standard signal, according to receiving the driving pulse that width is about 200ms, bistable trigger 8 counter-rotatings.The output of bistable trigger 8 is connected to switching circuit 6, in order to select a certain oscillator.

The work of the appendix wave producer circuit of Fig. 1 is as follows, after the TV signal of NTSC system receives, 3.58MHZ burst signal from burst gate 8 from generate, burst signal is added to

phase detectors

2 and 7, in this case, output switch circuit 6 actions according to flip and flop generator 8 connect crystal oscillator 5a and VCO4.Simultaneously, the APC loop works with the burst signal synchronous regime of 3.58MHZ, therefore, VCO4 produces the appendix ripple of 3.58MHZ.After this manner, in case the APC loop becomes synchronously, after phase detectors 7 produced the phase-detection letter, it suspended the flip and flop generator further work, so VCO4 produces the 3.58MHZ appendix ripple of stable standard.Secondly, as because of certain reason, the control lag of flip and flop generator, switching circuit 6 may so move, so that with crystal oscillator 5b(4.43MHZ) receive VCO4, in this case, signal in the APC loop loses synchronously, thereby from phase detectors 7 non-output signals, therefore, flip and flop generator is according to receiving that next driving pulse changes its state, and conversion switch circuit 6 is with crystal oscillator 5a(3.58MHZ) receive VCO4.Correspondingly, the APC loop is synchronously in the 3.58MHZ frequency, so VCO4 produces the appendix ripple of the 3.58MHZ of standard.

Secondly, because of the passage conversion, receive the TV signal of PAL system, 4.43MHZ burst signal separate and generate from burst gate 1, similarly, since the output signal of flip and flop generator 8, switching circuit 6 actions, so that crystal oscillator 5b is received VCO, therefore, the APC loop works with the burst signal synchronous regime of 4.43MHZ, therefore, VCO4 produces the appendix ripple of 4.43MHZ, after this manner, in case the APC loop synchronously in the 4.43MHZ frequency, phase detectors 7 produce a phase detection signal, it suspends flip and flop generator 8 further works, so VCO produces the stable 4.43MHZ appendix ripple of standard.

According to above-described appendix baud generator circuit, some shortcomings are arranged, be described as follows.

First advantage is about faulty operation, and it may be present in the situation of the TV signal that receives Sequential Color and Memory system.

According to the SECAM system, carrier chrominance signal comprises the appendix ripple of 4.25MHZ or 4.406MHZ, and it is very near the burst signal of 4.43MHZ.When the TV signal of SECAM is receiving, if there is the signal composition of afterbody of the horizontal-drive signal of the burst signal that comprises Phase Alternation Line system or TSC-system to enter, the APC circuit carries out feedback operation, and the result causes faulty operation, seems that the signal that receives is 4.43MHZ.

Second kind of shortcoming is about may being present in the faulty operation under the passage change over condition, from a kind of broadcasting system-such as PAC system-change another kind of broadcasting system over to, as Sequential Color and Memory system.

More precisely, according to appendix wave producer circuit in the past, time constant as the APC loop of low pass filter is quite long, therefore, when passage is changed in two kinds of different broadcasting systems, need considerable time to detect selected broadcasting system, and in order to produce appropriate appendix ripple and conversion switch circuit 6 from VCO4.During this period of time, the image on the screen usually distorts.

Last shortcoming is about faulty operation.It is to be caused by the noise in the flip and flop generator 8, or cause by the noise in the standard testing circuit that detects the broadcasting system that is receiving.

Say that exactly according to multistandard TV receiver in the past, the standard testing circuit detects and produce the signal of the type of representing the broadcasting system that is receiving.But because noise signal system testing circuit makes error detection, for example, noise is included in the received broadcast singal, or is reproduced and produced by video tape recorder, or produce when adding the video recording search signal.

Development of the present invention is in view of from solving the aforesaid drawbacks in essence, and its main purpose provides a kind of improved multistandard TV receiver, can not take place to cause faulty operation by noise.These noises are by the channel change between two kinds of different broadcasting systems or any above-mentioned former thereby cause.

Behind channel change between two kinds of different broadcasting systems, to provide stable image immediately, it also is purpose of the present invention that this improved multistandard TV receiver is provided.

In order to realize such and such purpose, according to the present invention, multistandard TV receiver is applicable to the TV signal that receives different systems, and such as the PAL system, NTSC system and SECAM system have multiple different appendix wave frequency.Comprise frequency detection circuit than television receiver, be used to detect the appendix wave frequency of TV signal and produce frequency data, represent detected frequency; The standard testing circuit is used to detect the standard of TV signal and produce the standard data, represents detected standard; The passage change detecting circuit is used for the change of sense channel; Holding circuit, the passage that is used for recording according to testing circuit changes holding frequency data and standard data, and TV set circuit, and it complys with frequency data and the standard data are set up.

In addition, according to a kind of preferable concrete device of the present invention, multistandard TV receiver comprises the APC loop, and it comprises voltage controlled oscillator and receives oscillator and the oscillator of receiving oscillator, the vibration that is used to produce different frequency; Phase detectors are used to detect the burst signal of TV signal and the phase difference of the oscillator signal from oscillator; Flip and flop generator is subjected to the control of the signal of phase detectors; Look suppresses signal generating circuit, is used for the SECAM system; Switching circuit is subjected to the control of flip and flop generator; Select circuit, be used to select oscillator, realize the vibration of required frequency.

Have pulse generating circuit to be equipped in the above-mentioned preferable concrete device in addition, it produces passage change pulse according to the change of passage, and wherein the APC loop also comprises the low pass filter that is connected to voltage controlled oscillator.The free constant of this low pass filter is provided with circuit, when having passage change pulse, shortens the time constant of low pass filter.

Equally, in above-mentioned preferable concrete device, the also free constant of phase detectors is provided with circuit, when having passage change pulse, shortens the time constant of phase detectors.

The accompanying drawing summary

To understand such and such purpose of the present invention and characteristics from following explanation and accompanying drawing at preferable concrete device.In whole accompanying drawings, each parts is put on and is consulted number.

Fig. 1 is a circuit diagram of in the past paying carrier generator.

Fig. 2 is circuit diagram and the relative section thereof of paying carrier generator according to preferable concrete device among the present invention.

Fig. 3 is the voltage curve on the each point of Fig. 2 circuit.

Fig. 4 is the calcspar according to improved pair of carrier generator of the present invention.

Fig. 5 is low-pass filter circuit figure, can replace the low pass filter among Fig. 2.

Consult Fig. 2, the tuner that is used for received television signal and produces tuning good TV signal is connected to signal trap 30 frequently, and the latter receives vision intermediate frequency (PIF) 31 again.Each SECAM circuit is received in the output of PIF31, PAL/NTSC detection 27 and video trap 32, and video trap 32 is received the video circuit (not shown), receives band pass filter (BPF) 19 equally again, and the latter receives bandpass amplifier 20.On the contrary, bandpass amplifier 19 produces carrier chrominance signal, and the latter is added to burst gate 1.Burst gate 1 responds burst gate pulse and works, phase detectors 2 are received in the output of burst gate 1, be used for automatic phase controller (APC), low pass filter 3 is connected to phase detectors 2, receive voltage controlled oscillator 4 again, its logical switching circuit 6 is connected with 5b with crystal oscillator 5a, in order to produce the vibration of 3.58MHZ and 4.43MHZ frequency respectively.Automatic phase controller (APC) is defined as and comprises phase detectors 2, the feedback loop of low pass filter 3 and VCO4, correspondingly, VCO4 produces the carrier signal of paying of 3.58MHZ and MHZ frequency, it depends on the frequency of burst signal, below will describe in detail in some sense.

According to preferable concrete device, low pass filter 3 comprises electric capacity 9, is connected between the hot line and ground that transmits signal, also has the series circuit of circuit 11 and electric capacity 10 in parallel with electric capacity 9.And the series circuit of electric capacity 12 and normally closed switch 13 is in parallel with electric capacity 10, and the open and close of switch 13 is subjected to the control from the pulse of pulse generator 15, hereinafter will illustrate to a certain extent.

The output of VCO4 is added on the PAL/NTSC demodulator 33, and it produces R-Y or B-Y signal, and the output of VCO4 also is added on the phase detectors 7, and the latter also receives the output signal from burst gate 1.

According to preferable concrete device, phase detectors 7 link to each other with electric capacity 16, latter's ground connection.Equally, the series circuit of electric capacity 17 and normally closed switch 18 is in parallel with electric capacity 16.The open and close of normally closed switch 18 is subjected to the control from the pulse of pulse generator 15 equally, hereinafter will illustrate to a certain extent.

Channel to channel adapter 14 is connected to pulse generator 15, and whenever broadcast channel during by channel to channel adapter 14 change, pulse generator 15 produces a short pulse, as among Fig. 3 shown in the waveform d.This short pulse is added to each normally closed

switch

13 and 18, in order that the pulse duration of stay with switch opens, after switch 13 was opened, electric capacity 12 was thrown off with electric capacity 10, thereby the time constant of low pass filter is shortened.Equally, open when switch 18, the time constant of phase detectors 7 shortens, and after the time constant shortened, the feedback procedure in APC loop was accelerated, thereby the very fast generation of VCO is used for the carrier wave of paying of the new passage of selecting.Even between the different broadcasting systems of different carrier frequencies, carry out passage when change, and also can realize this quick response, similarly, passage can obtain the stable carrier wave of paying after changing immediately.

Being equipped with upward, phase detectors 7 are in order to produce the colored output that suppresses, it is added to bandpass amplifier 20 and bistable trigger-action circuit 8, when VCO4 produce the 3.58MHZ frequency pay carrier wave the time, the signal that flip and flop generator 8 responses obtain from phase detectors 7 provides high potential.Similarly, when VCO4 produce the 4.43MHZ frequency pay carrier wave the time, flip and flop generator 8 provides electronegative potential.The output waveform of flip and flop generator is presented at a of Fig. 3, it be added to detect control circuit 22 with door 22a.

Detecting control circuit 22 also comprises and door 22b and 22c and pulse generator 22d, be connected with one of door 22b input and receive SECAM circuit 26, when the TV signal that receives is Sequential Color and Memory system, it ought not be Sequential Color and Memory system that this circuit provides high potential, provide low-voltage, see the waveform b of Fig. 3.Be connected to PAL/NTSC detector 27 with the input of door 22c, when the TV signal that receives is TSC-system, back circuit provides high potential, when being Phase Alternation Line system or Sequential Color and Memory system, provide electronegative potential, see the waveform c of Fig. 3, with door 22a, another input of 22b and 22c is connected to pulse generator 22d.The input of pulse generator 22d be connected to or the door 22e, it has two inputs, or the door 22e an input be connected to pulse generator 15, another is connected to tv signal detector 28, and the details of pulse generator 22d hereinafter will be described.

Tv signal detector 28 has two inputs: one is used to receive horizontal pulse, another receives lock-out pulse, similarly, when the TV signal that receives from wireless (nothing is drawn), cable (not shown) or video tape recorder, tv signal detector 28 produces high potential, waveform e as Fig. 3, thereby, when passage changes, tv signal detector 28 produces electronegative potential, from this viewpoint, the signal similar that signal that tv signal detector 28 produces and pulse generator 15 produce, but the phase place of these two kinds of signals is opposite.In addition, the signal of tv signal detector 28 has such characteristics, when recording a video when reappearing, note passage change on tape also can be detected, thereby, when the passage change is arranged on video tape, pulse generator 15 does not produce pulse, as long as tv signal detector 28 produces pulse.

Correspondingly, or door 22e is not only when passage changes really, and the passage on video tape changes and produces signal when detected.

Shown in Fig. 3 waveform, the rising of pulse generator 22d detection waveform d or the rising of waveform e, and produce a pulse, width is t or t '.Correspondingly, with door 22a, 22b and 22c only could move when pulse exists, and this is to be right after in passage very short time after changing, and the passage change may be actual, or posts the passage change on video tape.

With door 22A, 22B and 22C are connected to holding circuit 23, the signal that it and reset circuit 25 receives from TV signal testing circuit 28, when passage after changing, produce reset signal.Correspondingly, after new tunnel is selected, remain in the holding circuit 23 with the output signal of door 22A, and from the output 24A output of holding circuit 23.Similarly, be held with the output signal of door 22B, and export from output 24B.And, be held with the output signal of door 22C, and export from output 24C.In case holding circuit after being right after channel selecting, keeping from door 22C, the various data of 22B and 22C, these data are keeping at selected passage duration of work always.

Outlet terminal 24A with carrier-frequency data is connected to switching circuit 6, is used for selecting any one of crystal oscillator 5A and 5B, also receives band pass filter 19, video trap 32 and audio frequency trap 30.

Outlet terminal 24B with the data of representing Sequential Color and Memory system is connected to during the Sequential Color and Memory system, keeps the SECAM circuit working.

With representing Phase Alternation Line system to become the outlet terminal 24C of the data of TSC-system to be connected to PAL/NTSC demodulator 33.When the TV signal that receives is a Phase Alternation Line system, outlet terminal provides electronegative potential, thereby demodulator 33 is set to the PAL demodulation device.On the contrary, when the signal that receives is that TSC-system outlet terminal 24C will provide high potential, thereby demodulator 33 is set to the NTSC demodulator.

Down, the work of key diagram 2 circuit, according to this concrete device shown in Figure 2, television receiver is applicable to five kinds of different broadcasting systems, and it is: with the Phase Alternation Line system of 3.58MHZ appendix ripple; Phase Alternation Line system with 4.43MHZ appendix ripple; TSC-system with 3.58MHZ appendix ripple; With the TSC-system of 4.43MHZ appendix ripple, and the Sequential Color and Memory system of paying carrier wave with 4.43MHZ.

Suppose, common selector 14 warming-up exercises, selection is with the TV signal of the TSC-system formula of 3.58MHZ appendix ripple, after the channel to channel adapter action, pulse generator 15 produces a pulse (first pulse of waveform D), and it impels pulse generator 22D to produce a pulse (first pulse under the waveform), when pulse exists, flip and flop generator 8 provides high potential, and the frequency that carrier wave is paid in expression is 3.58MHZ.Also have, SECAM circuit 26 provides electronegative potential, and the TV signal that expression receives is not that Sequential Color and Memory system and PAL/NTSC detector 27 provide high potential, and expression is a TSC-system by the TV signal of receiving.

Correspondingly, when pulse generator 22D produces pulse (first pulse of waveform T), each provides high potential (waveform G and I) with door 22A and 22C, do not produce pulse (waveform H) with door 22B, with door 22A, these signals of 22B and 22C output are results of response pulse, and remain in the holding circuit 23, correspondingly respectively from

outlet terminal

24A, 24B and 24C provide high and low and high potential for it.These are from outlet terminal 24A, and the signal of 24B and 24C is being kept up to reset circuit always and produced reset signal, just up to passage change next time.

The high potential of outlet terminal 24A is added to switching circuit 6, in order to select crystal oscillator, produces the vibration of 3.58MHZ, the high potential that comes from outlet terminal 24A also is added to band pass filter 19, in order to select to be suitable for the bandwidth of 3.58MHZ appendix ripple, in addition, also be added to video trap 32 and frequency trap 30.

The electronegative potential of outlet terminal 24B is added to SECAM circuit 26, in order to seal SECAM circuit 26.

The high voltage of outlet terminal 24C is added to PAL/NTSC demodulator 33, for demodulator 33 is set to the NTSC demodulator.

Owing to only work as and door 22A, after 22B and 22C are activated, represent the data of secam television signal and represent the data of appendix wave frequency just to be added to holding circuit 23, this is to be right after passage very short time after changing, the undesirable variation of these data or float and can not pass to holding circuit 23, and various circuit, such as switching circuit 6, correspondingly, in case holding circuit 23 is keeping the data in the TV signal in the initial moment of channel selecting, even this kind data will can not change when TV signal fluctuates or noise occurs in TV signal.

Correspondingly, television receiver not only automatically is provided with the circuit that is applicable to the TV signal that receives, and and passage keep similarly and keeping, when channel to channel adapter 14 impels the passage change, maybe when posting passage change signal regeneration on video tape when coming out, new data will be set and remain in the holding circuit 23.

Following table is listed and is used for different systems and looks signal, by outlet terminal 24A, and the signal that 24B and 24C provide.

The TV signal 24A 24B 24C that receives

PAL 3.58MHZ appendix ripple is low

PAL 4.43MHZ appendix wave height is low

NTSC 3.58MHZ appendix ripple is low high

NTSC 4.43MHZ appendix wave height is low high

The low height of SECAM 4.43MHZ appendix ripple

According to the concrete device of Fig. 2, detect control circuit 22 and use and a door 22A, 22B and 22C, but be under the situation of negative pulse being added on the door, available other gate (such as NOR gate) replaces these and door.

Consult Fig. 4, can see another kind of according to the present invention improved appendix wave producer, the output of flip and flop generator 8 is connected to or door 34, it also receives the signal of the SECAM inhibitor 35 from the SECAM circuit.Or the output of door 34 is connected to switching circuit 6.The work of this circuit hereinafter is described.

When receiving the TSC-system TV signal, bistable trigger 8 produces the high potential of above-mentioned certain meaning, then, this high potential by or door 34 be added to switching circuit 6, in order to allow crystal oscillator 5A produce the vibration of 3.58MHZ, correspondingly, the APC loop is synchronously in the 3.58MHZ frequency, thereby VCO produces the appendix ripple of 3.58MHZ.

When receiving the pal television signal, flip and flop generator 8 produces the low-voltage of above-mentioned certain meaning, then, this electronegative potential by or door 34 be added to switching circuit 6 in order to allow crystal oscillator 56 produce the vibration of 4.43MHZ, correspondingly, the APC loop is synchronously in the 4.43MHZ frequency, thereby VCO produces the appendix ripple of 4.43MHZ.

When receiving the Sequential Color and Memory system TV signal, produce high potential with the colored SECAM inhibitor that suppresses of SECAM, therefore, regardless of the signal from flip and flop generator 8, or door 34 provides high potential.Correspondingly, switching circuit 6 conversions impel the vibration that produces 3.58MHZ.In the case, the appendix wave component that is included in frequency in the carrier chrominance signal and is 4.25MHZ or 4.406MHZ is added to phase detectors 2, because this frequency and 3.58MHZ are far apart, the feedback effect that VCO4 does not do the APC loop just produces the appendix ripple of 3.58MHZ.

In this case, the inhibition output that phase detectors 7 provide can be used to seal the treatment circuit of NTSC/PAL system, and makes the treatment circuit work of Sequential Color and Memory system.

Consult Fig. 5, can find out the circuit diagram of low pass filter.According to low pass filter shown in Figure 3, the series circuit of electric capacity 12 and normally closed switch 13 is in parallel with electric capacity 10, in order to shorten time constant when switch 13 is opened.According to remodeling shown in Figure 5, resistance 36 and normal open switch 13 ' series circuit in parallel with electric capacity 10.Similarly, when passage changed, switch 13 ' closure shortened time constant, and correspondingly, low pass filter 3 shown in Figure 5 can replace filter shown in Figure 23.

Though the concrete device with reference to preferable has illustrated the present invention all sidedly.For people skilled aspect this skill, obviously can find out many parts of improving and change.Scope of the present invention is not limited to the details of above-mentioned preferable concrete device, but is limited to the claim of enclosing.

Claims

1, multi-system television receives and is applicable to the reception Phase Alternation Line system, the TV signal of Sequential Color and Memory system and TSC-system, and it comprises:

The loop of APC, comprise voltage controlled oscillator (4) and be linked to above-mentioned oscillator oscillating element (5A, 5B), in order to produce the vibration of different frequency;

Phase detectors (7) are used to detect the phase difference between the oscillator signal of TV signal burst signal and above-mentioned oscillator;

Flip and flop generator (8) is subjected to the control of above-mentioned phase detectors output signal;

Suppress circuit (35), be used for the SECAM system in order to produce the colored signal that suppresses; And

Switching circuit (6) is subjected to the control of above-mentioned flip and flop generator and above-mentioned inhibition circuit, is used to select a kind of oscillating element, and oscillator is operated on the required frequency.

2, also comprise pulse generating unit (14,15) according to claim 1 described multistandard TV receiver, change according to passage, produce passage change pulse, wherein the APC loop also comprises the low pass filter (3) that is connected to above-mentioned voltage controlled oscillator, it has time constant circuit (12,13) is set, in order to shorten the time constant of low pass filter when above-mentioned passage change pulse exists.

3, also comprise pulse generating unit (14,15) according to claim 1 described multistandard TV receiver, change produces passage change pulse according to passage, wherein above-mentioned phase detectors (7) have time constant circuit (17,18) are set, in order to shorten the time constant of above-mentioned phase detectors when above-mentioned passage change pulse exists.

4, multistandard TV receiver is applicable to the TV signal of reception with the multiple different systems of multiple different carrier frequencies, and it comprises:

Frequency detecting device (7,8) is used to detect the carrier frequency of TV signal and produces the frequency data that instrument detects frequency;

Standard checkout gear (26,27) is used to detect the TV signal formula and produces the standard data that representative detects standard;

Passage modification detection device (14,15,28) is used for the change of sense channel;

Holding device (23) is used for according to above-mentioned detection device detected passage change maintenance said frequencies data and standard data;

Television circuit (6,19,32,30,26,33) is according to said frequencies data and standard data and be provided with.

5, the said frequencies checkout gear according to claim 4 described multistandard TV receivers comprises phase detectors (7), pay phase difference between the carrier signal and the flip and flop generator (8) that is connected to above-mentioned phase detectors (7) for what the burst signal that detects TV signal and oscillator (4) produced.