JPH09149290A - Waveform equalizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a circuit scale and a cost by executing waveform-equalize- processing to the input television signals of plural types by single CPU. SOLUTION: A MUSE signal or an EDTV signal inputted from an input terminal 10 is quantized by an A/D converter 11 and inputted to a transversal filter 120 and a signal type discrimination means 30. The signal type discriminating means 30 discriminates whether the inputted television signal is the MUSE signal or the EDTV signal and output the result to CPU 14, a waveform memory 13 and a video signal processing means 180. CPU 14 judges a waveform equalizing reference signal taken in by a waveform memory 13 to be a VIT (GCR) signal when the signal discriminating result of the signal type discriminating means 30 is a MUSE (EDTV) signal. Then the CPU 14 calculates the tap coefficient of the transversal filter 120 from an error with an ideal VIT (GCR) signal to control the coefficient of the transversal filter 120.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform equalizer for equalizing the waveform of signal distortion generated during transmission in EDTV broadcasting and high-definition broadcasting.

[0002]

2. Description of the Related Art Hi-vision broadcasting and EDTV (Exte
Neded Definition Tele Visi
On) In broadcasting, waveform equalization technology is an effective technology that removes transmission distortion and reproduces high-definition images.

Since a high-definition television signal has much more information than a current television signal (for example, NTSC ...), its transmission is MUSE (Multiply).
leSub-Nyquist Sampling En
A band compression technique using a sub-sample such as a coding method is used, and a waveform equalization technique for correcting waveform distortion due to the influence of transmission line characteristics is essential.

As an example of the MUSE type waveform equalizer, the National Conference of the Television Society (1988) 16-5, p.
p. 351-352, "MUSE Decoder Built-in Waveform Equalizer", Television Society National Convention (1989) 12-12, pp. There is a "waveform equalizer for high-definition receivers" reported in 279-280. This is because an impulse signal with a roll-off rate of 10% (hereinafter referred to as VIT signal) superimposed on a vertical blanking period of the MUSE signal is used as a reference signal for waveform equalization, and an ideal impulse signal (hereinafter referred to as an ideal reference signal) is used on the time axis. (Hereinafter referred to as VIT signal), the tap coefficient of the transversal filter is sequentially corrected to perform waveform equalization.

An example of a waveform equalizer in the EDTV system is an academic report of the Television Society (1989).
Vol. 13, No. 32, pp. There is a "GCR compatible ghost canceller" reported in 31-36. This is a ghost elimination reference signal GCR (Ghos) that makes one cycle with eight fields superimposed in the vertical blanking period of the EDTV signal.
t Cancel Reference signal (hereinafter G
(Hereinafter referred to as a CR reference signal), the correlation calculation with the ideal GCR reference signal is performed on the time axis to sequentially correct the tap coefficient of the transversal filter to perform waveform equalization.

In the television receiver compatible with the high-definition system and the EDTV system, it is important that the television receiver including the MUSE system waveform equalizer and the EDTV waveform equalizer reproduces a high-definition image. Technology.

Hereinafter, the conventional waveform equalization in the MUSE signal system and the EDTV signal system will be described as an example with reference to the drawings.

FIG. 6 is a block diagram showing a configuration example of a conventional waveform equalizer for the MUSE signal system and the EDTV signal system.

In FIG. 6, 100a is an input terminal for an EDTV signal, 101a is an A / D converter for quantizing the input EDTV signal, 102a is a transversal filter, and 103a is a GCR reference signal superimposed on the input EDTV signal. Waveform memory to be loaded, 104a is a CPU for performing waveform equalization calculation processing from the GCR reference signal, 105a
Is a ROM storing the instruction program of the CPU 104a,
Reference numeral 160 is an EDTV signal processing circuit, and 109a is an output terminal for an EDTV processing signal.

Further, in FIG. 6, 100b is MUSE.
A signal input terminal, 101b is an A / D converter for quantizing the input MUSE signal, 102b is a transversal filter, and 103b is a VI superimposed on the input MUSE signal.
A waveform memory for fetching a T signal, 104b a CPU for performing waveform equalization calculation processing from the VIT signal, 105b a C
ROM storing the instruction program of the PU 104b, 17
Reference numeral 0 is a MUSE signal processing circuit, and 109b is an output terminal for the MUSE processing signal.

The MUSE system and the E configured as described above
The operation of a conventional DTV type waveform equalizer will be described below.

In FIG. 6, an EDTV signal input terminal 1
The EDTV signal input from 00a is A / D converter 1
Transversal filter 1 quantized by 01a
02a is input. In the initial state of waveform equalization, the tap coefficient of the transversal filter 102a is set so that the input signal is output as it is.

The reference signal GCR signal for waveform equalization superimposed on the EDTV signal is a transversal filter 1
The output signal of 02a is taken into the waveform memory 103a and then inputted to the CPU 104a.

The GCR reference signal of the EDTV system is shown in FIG.
The WRB signal shown in FIG. 7A and the 0 pedestal signal shown in FIG. 7B are WRB signal → 0 pedestal signal → WRB signal → 0 pedestal signal → 0 pedestal signal → WRB signal → 0 pedestal signal → WRB for each field. The signals are superposed in the same horizontal period so as to form a signal, and the sequence is one cycle of eight fields.

By subjecting the signals of these 8 fields to the operation shown in the first equation below, the color burst signal and the signal from which the horizontal synchronizing signal component is removed, as shown in FIG. 7C, can be obtained. it can.

[0016]

(Equation 1)

However, in the above (Equation 1), Fn (n = 1
~ 8: n is an integer) represents the signal of the nth field.

Hereinafter, the processing between fields as shown in (Equation 1) is called field sequence processing. CPU1
Reference numeral 04a further differentiates the signal shown in FIG. 7C obtained by (Equation 1) to obtain the signal shown in FIG. 7D, and this waveform is used as a reference signal for waveform equalization processing.

The CPU 104a compares the waveform shown in FIG. 7 (d), which has been subjected to the captured field sequence processing and the differential processing in the waveform memory 103a, with an ideal GCR reference signal (hereinafter referred to as an ideal GCR reference signal), The tap coefficient of the transversal filter 102a is calculated from the error and the coefficient of the transversal filter 102a is controlled.

Generally, as a method for obtaining tap coefficients of a transversal filter, for example, ZF (Zero Fo) is used.
rcing) method. In this method, the optimum tap coefficient is finally obtained by sequentially correcting it on the time axis according to a certain algorithm.

The GCR reference signal and the ideal G superimposed on the output EDTV signal of the transversal filter 102a.
If the error signal sequence with the CR reference signal is {E _k } and the total number of taps is M, the n-th tap coefficient {C _i } ⁽ⁿ⁾ of the transversal filter is calculated based on the following (Equation 2) in the ZF method. To be done.

However, α is a coefficient for determining the correction amount.

[0023]

(Equation 2)

The CPU 104a synchronously adds the GCR reference signal captured by the waveform memory 103a a sufficient number of times to improve the S / N ratio and removes noise components.
The field sequence processing of (Equation 1) and the calculation of (Equation 2) are performed to calculate the tap coefficient and set in the transversal filter 102a. It is necessary to increase the number of synchronous additions as the noise amount increases.

A series of these processes are performed by software, and the flowchart is shown in FIG.

In this process, the process is repeated until the amount of error between the GCR reference signal captured by the waveform memory 103a and the ideal GCR reference signal becomes sufficiently small.

The series of processing procedures by the CPU 105a are stored in the ROM 104a as an instruction program, and the CPU 104a sequentially calls and executes the instruction program of the ROM 105a.

The waveform equalization processing of the MUSE signal is performed as follows. In FIG. 6, the MUSE signal input from the MUSE signal input terminal 100b is quantized by the A / D converter 101b and input to the transversal filter 102b. In the initial state of waveform equalization, the tap coefficient of the transversal filter 102b is set so that the input signal is output as it is.

The reference signal VIT signal for waveform equalization superimposed on the MUSE signal is the transversal filter 1
The output signal of 02b is taken into the waveform memory 103b and then inputted to the CPU 104b.

FIG. 9 shows the signal format of the MUSE system. M
As shown in FIGS. 10 (a) and 10 (b), the VIT signal of the reference signal for waveform equalization in the USE method has negative and positive signals inserted in the first line and the second line, respectively. There is.

The CPU 104b is shown in FIGS. 10 (a) and 10 (b).
The signal shown in is used as a reference signal for waveform equalization.

The CPU 104b uses the waveform memory 1
VIT signal captured by 03b and ideal VI
The tap coefficient of the transversal filter 102b is calculated from the error of the T signal (hereinafter referred to as an ideal VIT signal), and the coefficient of the transversal filter 102b is controlled.

Regarding the tap coefficient calculation method, the above-mentioned E
Since it is the same as the calculation method in the DTV method, it is omitted here.

The CPU 104b synchronously adds the VIT signal fetched by the waveform memory 103b a sufficient number of times to improve the S / N ratio and removes the noise component, and then performs the operation of (Equation 2) to determine the tap coefficient. It is calculated and set in the transversal filter 102b. It is necessary to increase the number of synchronous additions as the noise amount increases.

A series of these processes are performed by software, and this flowchart is shown in FIG.

In this processing, the processing is repeated until the amount of error between the VIT signal captured by the waveform memory 103b and the ideal VIT signal becomes sufficiently small.

The series of processing steps by the CPU 105b are stored as an instruction program in the ROM 104b, and the CPU 104b sequentially calls and executes the instruction program of the ROM 105b.

The waveform equalization of the conventional MUSE system and EDTV system has been performed as described above.

[0039]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The conventional MUSE and EDTV waveform equalizers are MUSE and EDT.
Each V-type circuit requires a dedicated waveform equalizing means, and in particular, the CPU is expensive, and it has been required to be shared for cost reduction.

[0040]

SUMMARY OF THE INVENTION To solve the above-mentioned problems, a waveform equalizer of the present invention is one in which a plurality of types of input television signals are waveform-equalized by one CPU.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is one CPU for inputting a plurality of types of input television signals.
The waveform equalization apparatus is characterized by performing waveform equalization processing according to (1), and enables waveform equalization of television signals of a plurality of signal formats with one waveform equalization apparatus.

The inventions according to claims 2 and 3 are
A signal format discriminating means for discriminating the signal format of the input television signal on which the reference signal for waveform equalization is superimposed, a transversal filter for equalizing the waveform of the input television signal, and an output from the transversal filter. And a waveform memory for extracting and storing the waveform equalization reference signal from the television signal, and a coefficient determination of the transversal filter by performing waveform equalization operation from the waveform equalization reference signal stored in the waveform memory. CPU for controlling and R for storing instruction program of the CPU
An OM is provided, and the waveform equalization method is changed according to the output of the signal discriminating means. The signal format discriminating means discriminates the format of the input signal, and the waveform conforming to the input signal is obtained. It becomes possible to perform equalization.

The inventions according to claims 4 and 5 are:
A transversal filter for performing waveform equalization processing of an input television signal on which a reference signal for waveform equalization is superimposed, and a plurality of units for extracting and storing the reference signal for waveform equalization from the television signal output from the transversal filter CPU for determining the waveform of the transversal filter and controlling the waveform equalization operation from the waveform memory and the reference signal for waveform equalization stored in the waveform memory.
And a ROM for storing the instruction program of the CPU, which enables one CPU to equalize the waveforms of television signals of a plurality of signal formats.

The inventions according to claim 6 and claim 7 are
Signal format discriminating means for discriminating the signal format of the input television signal on which the reference signal for waveform equalization is superimposed, reset means for generating a reset pulse by the output of the signal discriminating means, and waveform of the input television signal A transversal filter that performs equalization processing, a waveform memory that extracts and stores the waveform equalization reference signal from the television signal output from the transversal filter, and the waveform equalization reference stored in the waveform memory A CPU that performs waveform equalization calculation from a signal to determine and control the coefficient of the transversal filter, and a ROM that stores at least two types of instruction programs of the CPU are provided, and waveform equalization is performed according to the output of the signal determination unit The method is changed so that one CPU can equalize the waveforms of television signals of multiple signal formats. It is intended to allow.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. (Embodiment 1) An embodiment of the invention described in claim 1, claim 2, and claim 3 of the present invention will be described below with reference to FIG.

In FIG. 1, 10 is an input terminal for a television signal, 11 is an A / D converter for quantizing the input television signal, 30 is a signal format discriminating means for discriminating the signal format of the input television signal, Reference numeral 120 is a transversal filter, 13 is a waveform memory for loading a reference signal for waveform equalization superimposed on an input television signal, and 14 is a CP for performing waveform equalization calculation processing from the waveform equalization reference signal.
U and 15 are ROs storing the instruction program of the CPU 14.
M and 180 are video signal processing means, and 90 is an output terminal of the video processing signal.

Hereinafter, in FIG. 1, the input signal is MUSE.
The operation when a television signal of the EDTV format and a television signal of the EDTV format is input will be described.

In FIG. 1, the MUSE signal or EDTV signal input from the input terminal 10 is the A / D converter 1
Transversal filter 120 quantized by 1
Is input to the signal determination means 30. In the initial state of waveform equalization, the tap coefficient of the transversal filter 120 is set so that the input signal is output as it is. On the other hand, the signal discriminating means 30 discriminates whether the input television signal is the MUSE signal or the EDTV signal, and the CPU 14, the waveform memory 13, and the video processing means 1
The determination result is output to 80.

The waveform memory 13 outputs the VIT signal when the signal discrimination result of the signal discrimination means 30 is the MUSE signal, and G when the signal discrimination result of the signal discrimination means 30 is the EDTV signal.
The CR signal is taken in from the output signal of the transversal filter 120 and transferred to the CPU 14.

When the signal discrimination result of the signal discriminating means 30 is the MUSE signal, the CPU 14 discriminates the waveform equalization reference signal taken in by the waveform memory 13 as the VIT signal, and from the error from the ideal VIT signal, the transformer The tap coefficient of the versal filter 120 is calculated and the coefficient of the transversal filter 120 is controlled.

Further, when the signal discrimination result of the signal discriminating means 30 is the EDTV signal, the CPU 14 discriminates the waveform equalization reference signal fetched by the waveform memory 13 as the GCR signal, and from the error from the ideal GCR signal, the transformer is determined. The tap coefficient of the versal filter 120 is calculated and the coefficient of the transversal filter 120 is controlled.

In this way, the V loaded in the waveform memory 13
IT signal and ideal VIT signal, or GCR signal and ideal G
The process is repeated until the amount of error from the CR signal becomes sufficiently small.

The series of processing procedures by the CPU 14 are stored in the ROM 15 as an instruction program, and the CPU 14 sequentially calls and executes the instruction program of the ROM 15.

Regarding the concrete tap coefficient calculation method and algorithm, the above-mentioned MUSE method and EDTV are used.
The waveform equalizer of the conventional method has been described above in the related art, and therefore will be omitted here.

In this manner, the waveform-equalized television signal output from the transversal filter 120 is input to the video processing means 180, and the video processing means 180 determines that the signal format determination means 30 has the determination result of MUSE. In the case, the input signal is subjected to MUSE processing, and when the determination result of the signal format determination means 30 is EDTV, the input signal is subjected to EDTV processing and output from the video processing output terminal 90.

As described above, the waveform equalizer of the present invention is
One CPU enables waveform equalization of television signals of a plurality of signal formats.

(Embodiment 2) Embodiments of the invention described in claims 1, 4, and 5 of the present invention will be described below with reference to FIG.

In FIG. 2, 100a is an input terminal for an input EDTV signal, 101a is an A / D converter for quantizing the input EDTV signal, 102a is a transversal filter, and 103a is a GCR superimposed on the input EDTV signal.
A waveform memory for loading a reference signal, 160 is an EDTV signal processing circuit, 109a is an EDTV processed signal output terminal, 1
00b is an input terminal of the input MUSE signal, 101b is an A / D converter for quantizing the input MUSE signal, 102b
Is a transversal filter, 103b is an input MUSE
Waveform memory that captures the VIT signal superimposed on the signal, 1
Reference numeral 70 is a MUSE signal processing circuit, and 109b is an output terminal for the MUSE processing signal.

Further, reference numeral 140 is a C for performing waveform equalization calculation processing from the VIT signal for waveform equalization or the GCR signal fetched by the waveform memories 103a and 103b.
PU, 150 is a ROM storing the instruction program of the CPU 140.

Hereinafter, in FIG. 2, the input signal is MUSE.
The operation when a television signal of the EDTV format and a television signal of the EDTV format is input will be described.

In FIG. 2, EDTV signal input terminal 1
The EDTV signal input from 00a is A / D converter 1
Quantized by 01a and input to the signal format discrimination means 30 and the transversal filter 102a. In the initial state of waveform equalization, the transversal filter 10
The tap coefficient of 2a is set so that the input signal is output as it is.

The waveform memory 103a fetches the GCR reference signal from the output signal of the transversal filter 102a and transfers it to the CPU 104a.

Similarly, in FIG. 2, the MUSE signal input from the MUSE signal input terminal 100b is quantized by the A / D converter 101b, and the signal format discrimination means 3
0 is input to the transversal filter 102b.
In the initial state of waveform equalization, the tap coefficient of the transversal filter 102b is set so that the input signal is output as it is.

The waveform memory 103b fetches the VIT signal from the output signal of the transversal filter 102b, and C
Transfer to the PU 104b.

The signal format discrimination means 30 is the A / D converter 1
EDTV signal and MUS input from 01a and 101b
The signal format of the E signal is determined and the determination result is output to the CPU 140.

When the signal discrimination result output of the signal format discrimination means 30 is the EDTV signal, the CPU 140 calculates the tap coefficient from the GCR signal input from the waveform memory 103a, controls the transversal filter 102a, and controls MUSE. In the case of a signal, the tap coefficient is calculated from the VIT signal input from the waveform memory 103b to control the transversal filter 102b. Since a specific tap coefficient calculation method has been described in the conventional example, it is omitted here.

A series of these processes are performed by software, and this flowchart is shown in FIG.

In this process, the waveform memories 103a, 10a
The process is repeated until the amount of error of the VIT signal or GCR signal captured in 3b from the ideal VIT signal or ideal GCR signal becomes sufficiently small.

In FIG. 3, the MUSE signal and EDT are
When the V signals are simultaneously input, the waveform equalization of the MUSE signal is prioritized, but the waveform equalization of the EDTV signal may be prioritized.

The series of processing procedures by the CPU 140 are stored in the ROM 150 as an instruction program, and the CPU 140 sequentially calls and executes the instruction program of the ROM 150.

The EDTV signal and the MUSE signal output from the transversal filters 102a and 102b, which have been subjected to the waveform equalization processing as described above, are input to the EDTV signal processing means 180 and the MUSE signal processing means 170, respectively, and subjected to signal processing. After that, EDTV processing output terminal 109a, MU
It is output from the SE signal processing output terminal 109b.

As described above, according to the present invention, it is possible to perform waveform equalization processing on television signals of a plurality of signal formats by one CPU.

(Embodiment 3) Embodiments of the invention described in claims 1, 6, and 7 of the present invention will be described below with reference to FIG.

In FIG. 4, 100a is an input terminal for an input EDTV signal, 101a is an A / D converter for quantizing the input EDTV signal, 102a is a transversal filter, and 103a is a GCR superimposed on the input EDTV signal.
A waveform memory for loading a reference signal, 180 an EDTV signal processing circuit, 109a an output terminal for an EDTV processed signal, 1
00b is an input terminal of the input MUSE signal, 101b is an A / D converter for quantizing the input MUSE signal, 102b
Is a transversal filter, 103b is an input MUSE
Waveform memory that captures the VIT signal superimposed on the signal, 1
Reference numeral 70 is a MUSE signal processing circuit, and 109b is an output terminal for the MUSE processing signal.

Further, 140 is a C for performing waveform equalization calculation processing from the VIT signal for waveform equalization or the GCR signal fetched by the waveform memories 103a and 103b.
PU, 150 is a ROM storing the instruction program of the CPU 140, 30 is a signal format discriminating means for discriminating the input signal format, and 20 is a reset means for performing a reset control on the CPU 140 when the output of the signal format discriminating means changes. is there.

The operation of the waveform equalizer of the third embodiment will be described below with reference to FIG. In FIG. 4, ED
The EDTV signal input from the TV signal input terminal 100a is first quantized by the A / D converter 101a,
It is input to the transversal filter 102a. Transversal filter 1 in the initial state of waveform equalization
The tap coefficient of 02a is set so that the input signal is output as it is.

The waveform memory 103a fetches the GCR reference signal from the output signal of the transversal filter 102a and transfers it to the CPU 104a.

Similarly, in FIG. 4, the MUSE signal input from the MUSE signal input terminal 100b is first converted to A /
The signal is quantized by the D converter 101b and input to the signal format discrimination means 30 and the transversal filter 102b. In the initial state of waveform equalization, the tap coefficient of the transversal filter 102b is set so that the input signal is output as it is.

The waveform memory 103b fetches the VIT signal from the output signal of the transversal filter 102b, and
Transfer to the PU 104b.

The signal format discrimination means 30 is the A / D converter 1
The signal format of the MUSE signal input from 01b is determined, and the determination result is output to the reset means 20 and the ROM 150. In this embodiment, the signal format discrimination means 3
The output of 0 outputs the level of 0 of the digital signal when the input signal is determined to be the MUSE system, and outputs the level of 1 of the digital signal when the input signal is determined to be the other signal format. .

As shown in FIG. 5, the ROM 150 stores an instruction program for EDTV signal waveform equalization and a MUSE.
An instruction program for signal waveform equalization is stored. In this embodiment, the ROM 150 has a capacity of 64 kilobytes, and the EDTV is 32 kilobytes at addresses 0000h to 7FFFh (where h is a hexadecimal number).
The command program for signal waveform equalization is FF from 8000h.
An instruction program for MUSE signal waveform equalization is stored in 32 kilobytes at address FFh. The EDTV signal waveform equalization instruction program and the MUSE signal waveform equalization instruction program stored in the ROM 150 have the contents shown in the flowcharts of FIGS. 8 and 11 described in the related art. The output of the signal discriminating means 30 is connected to the highest address of the ROM 150.

The reset means 20 instructs the CPU 140 when the output signal of the signal discrimination means 30 changes, that is, when the digital signal level changes from 1 to 0 and when the digital signal level changes from 0 to 1. To send a reset signal to reset the CPU 140.

When the CPU 140 is reset by the reset signal from the reset means 20, the CPU 140 executes the waveform equalization processing according to the instruction program stored in the ROM 150.

At this time, if the output signal of the signal discriminating means 30 is the level of 1 of the digital signal, the instruction program is ED.
This is the waveform equalization processing of the TV signal, and if the output signal of the signal discrimination means 30 is the level of 0 of the digital signal, the command program is the waveform equalization processing of the MUSE signal.

As described above, MUS subjected to waveform equalization processing
E signal or EDTV signal is EDTV signal processing means 1
EDTV signal processing at 80, MUSE signal processing means 17
0 is subjected to MUSE signal processing, and EDTV processing output terminal 109a and MUSE signal processing output terminal 109b, respectively.
Output from

As described above, according to the present invention, it is possible to perform waveform equalization processing on television signals of a plurality of signal formats by one CPU.

[0087]

As described above, according to the present invention, by providing the means for discriminating the signal format of the input television signal and switching the waveform equalization method, the waveform can be processed by one CPU for a plurality of signal formats. Since the equalization processing becomes possible and the circuit scale and cost can be reduced, the practical effect thereof is great.

[Brief description of the drawings]

FIG. 1 is a block diagram of a waveform equalizer according to an embodiment of the present invention.

FIG. 2 is a block diagram of a waveform equalizer according to an embodiment of the present invention.

FIG. 3 is a flowchart of waveform equalization processing according to the embodiment of the present invention.

FIG. 4 is a diagram showing a program of the waveform equalizer in one embodiment of the present invention.

FIG. 5 is a block diagram of a waveform equalizer according to an embodiment of the present invention.

FIG. 6 is a block diagram of a conventional waveform equalizer.

FIG. 7 is a diagram showing an EDTV system signal.

FIG. 8 is a flowchart showing correction of tap coefficients.

FIG. 9 is a diagram showing a signal format of a MUSE signal.

FIG. 10 is a diagram showing a reference signal of the MUSE system.

FIG. 11 is a flowchart showing correction of tap coefficients.

[Explanation of symbols]

11, 101a A / D converter 13, 103a, 103b Waveform memory 14, 140 CPU 15, 150 ROM 20 Reset means 30 Signal format determination means 120, 102a, 102b Transversal filter 160 EDTV signal processing means 170 MUSE signal processing means 180 Video signal processing means

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location H04B 3/06 H04B 3/06 C // H04N 7/015 H04N 7/00 A (72) Inventor Takahiro Nakamura Osaka 1-1 Matsushita-cho, Ibaraki-shi, Japan Inside Matsushita ABC Technology Co., Ltd.

Claims (7)

[Claims] 1. A plurality of formats of input television signals
A waveform equalizer characterized by performing waveform equalization processing by one CPU. 2. A signal format discriminating means for discriminating the signal format of an input television signal on which a reference signal for waveform equalization is superimposed, a transversal filter for equalizing the waveform of the input television signal, and A waveform memory for extracting and storing the reference signal for waveform equalization from the television signal output from the transversal filter, and the transversal for performing waveform equalization operation from the reference signal for waveform equalization stored in the waveform memory. The CPU according to claim 1, further comprising a CPU for determining and controlling a coefficient of the filter and a ROM for storing a command program of the CPU, wherein the waveform equalizing method is changed according to the output of the signal discriminating means. Waveform equalizer. 3. The waveform equalizer according to claim 2, wherein the input television signal is one of a MUSE signal system and an EDTV signal system. 4. A transversal filter for performing waveform equalization processing of an input television signal on which a waveform equalization reference signal is superimposed, and a waveform equalization reference signal from the television signal output from the transversal filter. A plurality of waveform memories for taking out and storing the same, a CPU for performing waveform equalization operation from the waveform equalization reference signal stored in the waveform memory for determining and controlling the coefficient of the transversal filter, and an instruction for the CPU The waveform equalizer according to claim 1, further comprising a ROM for storing a program. 5. The waveform equalizer according to claim 4, wherein the input television signal is one of a MUSE signal system and an EDTV signal system. 6. A signal format discriminating means for discriminating the signal format of an input television signal on which a reference signal for waveform equalization is superimposed, a reset means for generating a reset pulse by the output of the signal discriminating means, and the input. A transversal filter that performs waveform equalization processing of a television signal,
A waveform memory for extracting and storing the reference signal for waveform equalization from the television signal output from the transversal filter, and a waveform equalization operation based on the reference signal for waveform equalization stored in the waveform memory. A CPU for determining and controlling a coefficient of a Versal filter, and a ROM for storing at least two types of instruction programs of the CPU, wherein the waveform equalization method is changed according to the output of the signal discriminating means. The waveform equalizer according to Item 1. 7. The waveform equalizer according to claim 7, wherein the input television signal is one of a MUSE signal system and an EDTV signal system.