JPH065942B2 - Reproduction video signal recording mode discrimination device and video signal reproduction device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording mode discriminating apparatus for reproduced video signals and a video signal reproducing apparatus, and in particular, recording by switching the carrier frequency of a frequency-modulated video signal according to a selected mode. The present invention relates to an apparatus and a video signal reproducing apparatus for discriminating a recording mode of a reproduced video signal when the recorded recording medium is reproduced.

2. Description of the Related Art In a home VTR, a carrier wave of a frequency-modulated luminance signal is higher than that of a current VTR standard (for example, VHS (registered trademark)) in combination with recent improvements in magnetic tape performance and magnetic head performance. By setting a high frequency and recording / reproducing, a high-quality image having a higher resolution than an image recorded / reproduced in the current VTR standard mode (hereinafter, this mode is referred to as a standard mode) is obtained. A recording / reproducing method for obtaining a high image quality mode has been considered.

Problems to be Solved by the Invention However, since the standard mode and the high image quality mode are not completely compatible with each other, it is determined which of the above modes the video signal to be reproduced is recorded. , It is necessary to perform playback in the same mode as when recording.

Therefore, for example, a changeover switch for switching between the standard mode reproduction system and the high image quality mode reproduction system is provided in the VTR, and the recorded signal of the magnetic tape is first reproduced in either mode, and then the reproduced image is monitored while monitoring the reproduced image. The changeover switch is changed so that the reproduced image can be reproduced in a mode in which the reproduced image is reproduced correctly.

However, this method is not very user-friendly, and when reproduced in a different mode, there is a problem in that the reproduced image quality is extremely deteriorated and the user may mistake this as a failure of the VTR.

Therefore, the present invention was created in view of the above points,
An object of the present invention is to provide a recording mode discriminating apparatus for a reproduced video signal, which automatically discriminates in which of a plurality of modes a reproduced signal is recorded.

Means for Solving the Problems The recording mode discriminating apparatus for a reproduced video signal according to the present invention is one of n types (n is an integer of 2 or more) in which carrier frequencies of frequency-modulated video signals are different from each other. It corresponds to the pedestal level of the horizontal blanking period and / or the vertical blanking period of the reproduced frequency-modulated video signal obtained by playing back the recording medium on which the frequency-modulated video signal is recorded. The recording mode is determined by detecting the carrier frequency to be recorded.

Further, according to the recording mode discriminating apparatus of the present invention according to the second aspect of the present invention, the frequency-modulated video signal corresponding to each pedestal level of n kinds of modes in which the carrier frequencies of the frequency-modulated video signal are different from each other. It is composed of n filter circuits for separately passing the video signal frequencies, n detection circuits, and means for outputting a recording mode determination signal of the reproduced frequency-modulated video signal.

The recording mode discriminating apparatus for reproducing video signals according to the present invention as defined in claim 3 allows a frequency-modulated video signal frequency corresponding to the pedestal level of one of two modes to pass through. One filter circuit,
It is composed of a single detection circuit and means for outputting a recording mode determination signal.

Further, in the video signal reproducing apparatus according to the present invention as set forth in claim 4, recording is performed in n kinds (n is an integer of 2 or more) of recording modes in which carrier frequencies of modulated frequency video signals are different from each other. Reproduction means for reproducing the modulated frequency video signal from the medium, equalizer means for imparting equalizer characteristics to the output signal of the reproduction means, respectively, and demodulation means for demodulating the video signal based on the output signal of the equalizer means And specifying means for specifying, based on the video signal demodulated by the demodulating means, a predetermined period in which the frequency component of the modulated frequency video signal does not change depending on the pattern, and output of the equalizer means for the predetermined period specified by the specifying means. Frequency detecting means for detecting the frequency component of the video signal, and determining means for determining the recording mode based on the detection result of the frequency detecting means Ri made.

In the recording mode discriminating apparatus of the reproduced video signal according to claim 2, the frequency-modulated video signals recorded on the recording medium in any one mode are reproduced from the recording medium and then n After separating the pedestal level equivalent frequency component of each mode separately by the filter circuit of,
It is supplied to the corresponding detection circuit, where the envelope detection is performed. The signals respectively taken out from the n detection circuits are leveled by the recording mode discrimination signal output means to the signal levels only in the pedestal level transmission section in the horizontal blanking period and / or the vertical blanking period. Based on at least one of the result obtained by the comparison and the result obtained by comparing the signal level in the pedestal level transmission section and the preset reference level, respectively, the signal for discriminating the recording mode of the reproduced frequency-modulated video signal. Is output as.

Further, in the reproduction video signal recording mode determination device according to claim 3, the frequency-modulated video signal recorded in one of the two modes is reproduced and is reproduced by a single filter circuit. After the frequency component corresponding to the pedestal of the mode is separated and supplied to the output means through the detection circuit, the pedestal level transmission of the reference level preset here and at least one of the horizontal blanking period and the vertical blanking period is performed. The signal level of only the section is compared, and based on the result, it is converted into a recording mode determination signal and output.

Further, in the video signal reproducing apparatus according to the present invention as set forth in claim 4, the reproducing means reproduces the modulated frequency video signal, and the equalizer means for imparting an equalizer characteristic to the output signal according to the recording mode. The recording mode is discriminated based on the detection result of the frequency component of the output signal detected by the frequency detecting means.

Embodiment FIG. 1 to FIG. 6 show block system diagrams of respective embodiments of the device of the present invention. In each figure, the same reference numerals are given to the same components. The device of the present invention is a device provided in the video signal reproducing system of the VTR, and the video signal to be reproduced is recorded in either one of the standard mode and the high image quality mode. Here, the video signal, particularly the luminance signal, is recorded on the magnetic tape in a signal form of a frequency-modulated luminance signal (FM luminance signal) obtained by frequency-modulating (FM) a carrier wave,
Although reproduced, the frequency spectrum of the FM luminance signal is
In the standard mode, as shown by I in FIG. 8, and in the high image quality mode, the carrier frequency is set higher than in the standard mode as shown by II in FIG.

In the frequency spectrum I of the FM luminance signal shown in FIG.
f _AS , f _AP and f _AW indicate carrier frequencies at the sync tip level S, pedestal level P and white peak level W of the luminance signal shown in FIG. 7, and similarly, f _BS , f _BP in the frequency spectrum II. And f _BW are carrier frequencies at the sync tip level S, the pedestal level P and the white peak level W of the luminance signal. For example, the carrier frequency f _AS in the standard mode is 3.4 MHz,
f _AP is 3.8 MHz, f _AW is 4.4 MHz, and the carrier frequency f _BS is 5.0 MHz and f _BP is 5.6 MH in the high image quality mode.
z and f _BW are 6.7 MHz.

As can be seen from FIG. 8, the carrier frequency f _AP corresponding to the pedestal level, which is an example of the carrier frequency in which the frequency component of the modulated frequency video signal does not change depending on the pattern,
In f _BP , although there are frequency components of sidebands of the FM luminance signal of the other mode, carrier frequencies f _AP , f
The energy of _BP is sufficiently larger than the energy of the sideband component of the same frequency in the other mode. In addition, the sync tip level only appears for a period of approximately 4.7 μsec in the 1H period, whereas the pedestal level is 1H.
The pedestal level is 10H during the vertical blanking period.
Since the modulation frequency component is not changed depending on the pattern, the generation period thereof is the longest in the synchronization period of the video signal. The present invention focuses on this point to perform mode discrimination, and an embodiment will be described below.

In the first embodiment shown in FIG. 1, the FM luminance signal reproduced from the magnetic tape is supplied to the band-pass filters (hereinafter referred to as BPF) 2 and 3 and the demodulation circuit 4 via the input terminal 1, respectively. BPF2 is a filter circuit having a narrow pass band characteristic in which the carrier frequency f _AP corresponding to the pedestal level in the standard mode is used as a pass center frequency, and BPF3 is a narrow band characteristic in which the carrier frequency f _BP corresponding to the pedestal level in the high image quality mode is used as a pass center frequency. It is a filter circuit having pass band characteristics. Therefore, when the input reproduction FM luminance signal is recorded in the standard mode, BP is better than BPF3.
The output signal of F2 is extracted with a large amplitude, and when recorded in the high image quality mode, the output signal of BPF3 has a larger amplitude than that of BPF2.

Both output signals of the BPFs 2 and 3 are separately supplied to the detection circuits 5 and 6, and subjected to envelope detection here and then supplied to the sample and hold circuits (hereinafter, referred to as S / H circuits for convenience) 7 and 8.

On the other hand, the demodulation circuit 4 is composed of a standard mode FM demodulation circuit, a high image quality mode FM demodulation circuit, and a switch circuit for switching the outputs of both FM demodulation circuits, as shown in FIG. A reproduced luminance signal obtained by demodulating and reproducing in either mode is output to the output terminal 9. This reproduced luminance signal is also supplied to the sampling pulse generating circuit 10 shown in FIG. A predetermined period in which the frequency component of the signal does not change depending on the pattern is specified based on the reproduction luminance signal demodulated by the demodulation circuit. For example, based on the reproduced horizontal synchronizing signal, a sampling pulse having a predetermined level is generated only in the horizontal blanking period and the vertical blanking period and excluding the synchronizing signal section.

This sampling pulse is simultaneously supplied to the S / H circuits 7 and 8, respectively, where the sync signals of the horizontal blanking period and the vertical blanking period are excluded from the detection signals from the detection circuits 5 and 6, respectively. Also, the signal level during the pedestal level transmission period is sampled and held. Therefore, when the reproduced FM luminance signal is recorded in the standard mode,
The output signal of the S / H circuit 7 has a carrier frequency corresponding to the pedestal level in the standard mode and is a large level because it becomes a detection signal in the pedestal level transmission section. The other is a sideband component of the reproduced FM luminance signal in the standard mode which is equal to the carrier frequency corresponding to the pedestal level in the high image quality mode, and is a detection signal in the pedestal level transmission section. When the reproduced FM luminance signal is recorded in the high image quality mode, the output signal level of the S / H circuit 8 is higher than the output signal level of the S / H circuit 7 contrary to the above. As a result, even if the reproduced FM luminance signal in which the sideband component is emphasized by the equalizer characteristic according to the recording mode is supplied by the equalizer circuits 33 and 34 and the switch circuit 35 described later, the frequency component of the reproduced FM luminance signal depends on the pattern. Since the frequency component that does not change in the predetermined period is detected, malfunction can be avoided.

The comparator 11 compares the output signal levels of the S / H circuits 7 and 8 with each other, and if the reproduced FM luminance signal is recorded in the standard mode, it is recorded in the first logical level and the high image quality mode. If so, a mode discrimination signal having the second logic level is generated and output to the output terminal 12.

Since the BPFs 2 and 3 separate and separate the FM luminance signal frequencies corresponding to the pedestal levels in the standard mode and the high image quality mode over the entire signal section, the output detection signal levels of the detection circuits 5 and 6 are returned in the video section. It is lower than the line erase period. By devising the circuit configuration of the detection circuits 5 and 6, the influence of the decrease in the detection signal level in this video section can be reduced, but in this case, for example, in the signal section recorded in the standard mode and the high image quality mode. When mode switching is performed because the recorded signal section is adjacent to the same magnetic tape, the switching response speed becomes slow.

Therefore, according to the present embodiment, since only the detected signal level in the pedestal level transmission period in which the signal is stable is sampled and held for level comparison,
A clear level comparison result can be obtained, and the switching response speed can be increased.

Next, a second embodiment of the device of the present invention will be described with reference to FIG. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the detection signals of the detection circuits 5 and 6 are compared in level by the comparator 13, and only the signal level of the output signal of the pedestal level transmission period is sampled and held by the S / H circuit 14.

According to the present embodiment, the mode discrimination operation equivalent to that of the first embodiment can be performed with the configuration having one less S / H circuit than the first embodiment. In addition, in the case of such a configuration,
Since the comparator output has only two values, it is more practical to use digital elements such as latches and flip-flops as the S / H circuit (the same applies to FIG. 6).

Next, a third embodiment of the device of the present invention will be described with reference to FIG. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 3, the comparator 15 compares the level of the output signal of the S / H circuit 7 with the first reference voltage from the reference voltage source 16. Comparator 1
7 compares the output signal of the S / H circuit 8 with the second reference voltage from the reference voltage source 18 in level. Due to this, when the input reproduction FM luminance signal is recorded in the standard mode,
Since the output signal level of the S / H circuit 7 becomes higher than the first reference voltage, the output signal of the comparator 15 becomes high level, and the output signal level of the S / H circuit 8 becomes the second reference voltage. Since it becomes a smaller level, the output signal of the comparator 17 becomes low level (hereinafter, the output state of such comparators 15 and 17 is indicated by H / L). On the other hand, when the image is recorded in the high image quality mode, the output signal of the comparator 15 is low level, contrary to the above.
The output signal of the comparator 17 becomes high level (hereinafter, the output state of such comparators 15 and 17 is indicated by L / H).

The discrimination matrix circuit 19 includes comparators 15 and 17
Is an arithmetic circuit that generates a high level signal when both output signals are H / L and a low level signal when they are L / H and outputs the signals to the output terminal 12 as a mode determination signal. By the way, the reproduced FM luminance signal does not always maintain a stable level state, and may become extremely small during special reproduction. Therefore, both output signals of the comparators 15 and 17 may have the same level (L / L or H / H). Therefore, the discrimination matrix circuit 19 discriminates the high image quality mode when the same level is input, and generates a low level signal.

In this way, priority is given to the determination of the high image quality mode,
When the standard mode is discriminated, the mid-high frequency components of the FM luminance signal recorded in the high image quality mode are cut by the standard mode reproduction system. Therefore, the video signal recorded in the high image quality mode is reproduced in the standard mode. However, while the image quality is extremely poor and it is not acceptable for viewing, the playback system in the high image quality mode has a wide transmission band and can transmit the FM luminance signal recorded in the standard mode to some extent, so that the image recorded in the standard mode can be transmitted. This is because even when the signal is reproduced in the high image quality mode, the deterioration of the image quality of the reproduced image does not have to be so severe that it cannot be watched.

According to this embodiment, the envelope levels of the two different frequency components in the pedestal level transmission section are compared with the reference voltage, and the discrimination signal is output based on the result. Compared to the two examples, there is more information for discrimination, which is the feature that more stable discrimination can be performed.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the figure, the same components as those in FIGS. 1 and 3 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 4, the output signals of the comparators 11, 15 and 17 are supplied to the discrimination matrix circuit 20. This discrimination matrix circuit 20 outputs a signal of a predetermined level to the output terminal 12 as a discrimination signal from the combination of the logical levels of the above-mentioned three input signals. The output signals of the comparators 15, 17 and 11 and the discrimination matrix circuit 20 are summarized in the following table.

However, ×: any is possible H / L: H or L output As can be seen from the above table, when the output logic levels of the comparators 15 and 17 are different from each other, the comparator 1
The output signal of the discrimination matrix circuit 20 is a signal of the same logic level as the output signal of the comparator 15 regardless of the output of 8. On the other hand, when both the output signals of the comparators 15 and 17 have the same logic level, the discrimination matrix circuit 20 follows the output signal of the comparator 11 and selects the mode of the higher level of the output signals of the S / H circuits 7 and 8. The discrimination signal of is output.

According to the present embodiment, 2 obtained by comparing the envelope level of the two frequency components equal to the frequency corresponding to the pedestal level of the FM luminance signal defined in the two modes and the envelope level only in the pedestal level transmission section with the reference voltage. Comparator 1 for detecting the magnitude relationship of the envelope level of the pedestal level transmission section by the type of detection information and the above two frequency components.
Since the detection information from 1 is added to determine the mode from these, more stable mode determination can be performed than in the third embodiment.

In each of the embodiments shown in FIGS. 3 and 4,
Although the S / H circuits 7 and 8 are provided on the input sides of the comparators 15, 17 and 11, a single S / H circuit may be provided on the output sides of the discrimination matrix circuits 19 and 20. .

By the way, in each of the above embodiments, two BPFs are used to separately pass the FM luminance signal frequencies corresponding to the pedestal levels of the two types of modes, but one BPF may be used. The fifth and sixth embodiments of the present invention shown in FIGS. 5 and 6 are examples of this case. Fifth
In the figure, the output signal of the S / H circuit 7 is the comparator 2
1 where it is level compared to the reference voltage from the reference voltage source 22. When the input reproduction FM luminance signal is recorded in the standard mode, the output signal of the S / H circuit 7 is higher than the reference voltage, while when it is recorded in the high image quality mode, it is lower than the reference voltage. Therefore, the reference voltage from the reference voltage source 22 is preset.

Therefore, from the comparator 21 to the output terminal 12, S /
A mode discrimination signal is output by comparing the level of the output signal of the H circuit 7 with the reference voltage from the reference voltage source 22.

Next, a sixth embodiment of the device of the present invention will be described with reference to FIG. 6. In FIG. 6, the same components as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. This embodiment has a configuration in which the positions of the S / H circuit 7 and the comparator 21 of the fifth embodiment are interchanged, and the output signal of the detection circuit 5 is supplied to the comparator 23, where it is preset by the reference voltage source 24. It is supplied to the S / H circuit 14 after being level-compared with the reference voltage. As a result, similarly to the fifth embodiment, the mode discrimination signal can be output to the output terminal 12 with a simple circuit configuration.

In FIGS. 5 and 6, BPF2 is replaced by B instead of BPF2.
Of course, PF3 may be used.

Next, the reproducing system of the two-head helical scan type VTR having the above mode discriminating device will be described with reference to FIG. In the figure, the frequency division multiplexed signal of the FM luminance signal and the low frequency conversion carrier color signal recorded on the magnetic tape 25 is
It is alternately reproduced by the rotary heads 26 and 27, and is supplied to the switch circuit 30 which is switched by the head switching pulse of the two-field cycle from the terminal 31 through the preamplifiers 28 and 29. Hereinafter referred to as HPF) 32 and LPF
48. The reproduced FM luminance signal separated by the HPF 32 is separately supplied to the switch circuit 35 through the equalizer circuit 33 in the standard mode and the equalizer circuit 34 in the high image quality mode.
It is supplied to the limiter 37 and the mode discriminating circuit 38 according to the present invention via 6.

Limiter 38, FM demodulators 39 and 42, LPFs 40 and 4
3, the de-emphasis circuits 41, 44 and the switch circuit 45 constitute the demodulation circuit 4 shown in FIGS. 1 to 6. The mode discriminating circuit 38 is a circuit of the mode discriminating device of each of the embodiments shown in FIGS. 6 to 6 except the demodulating circuit 4, and the reproduced FM luminance signal from the AGC circuit 36 is input to the input terminal 1. The output reproduction luminance signal of the switch circuit 45 is supplied to the sampling pulse generating circuit 10 therein.

Reproduced FM from which the amplitude fluctuation component is removed by the limiter 37
The luminance signal is a standard mode reproduction system FM demodulator 39, LP
While being supplied to the switch circuit 45 via the F40 and the de-emphasis circuit 41, it is supplied to the switch circuit 45 via the FM demodulator 42 of the high image quality mode reproduction system, the LPF 43 and the de-emphasis circuit 44.

On the other hand, as described above, the reproduction F
A mode discrimination signal obtained by automatically discriminating whether the M luminance signal is recorded in the standard mode or the high image quality mode is supplied to the system controller 46, and further supplied as a switching pulse to the switch circuits 35 and 45. To be done. As a result, the switch circuits 35 and 45
Is connected to the terminal A side when the standard mode is determined, and is switched to the terminal B side when the high image quality mode is determined.

Further, the reproduction signal extracted from the switch circuit 30 is subjected to the low-pass conversion carrier color signal separated by the LPF 48, and thereafter, the reproduction chroma processing circuit 49 removes the jitter by a known means and the original band. Is returned to the reproduced carrier color signal. The adder circuit 47 adds this reproduction carrier color signal,
The reproduction luminance signal reproduced and demodulated in the reproduction system in the same mode as that at the time of recording, which is taken out from the switch circuit 45, is added and combined and output to the output terminal 50 as a reproduction color video signal.

It should be noted that the present invention is not limited to the above-described embodiment, and even when there are three or more recording / reproducing modes, the mode determination can be performed in the same manner as above. Also, the signal section to be sampled and held has been described as a pedestal level transmission section excluding the synchronization signal section in both the horizontal and vertical blanking periods, but either one of the pedestal in both the horizontal and vertical blanking periods is described. Of course, only the level transmission section may be used.

Further, in the above-described embodiment, the pedestal transmission section is specified by the sampling pulse generation circuit 10 to determine the BPF.
2, 3, detection circuits 5, 6 and sample hold circuit 7,
Although the frequency component of the pedestal transmission section is detected by means of No. 8, the present invention focuses on a predetermined period during which the frequency component of the frequency video signal does not change depending on the pattern, and is therefore limited to the pedestal transmission section. Of course, it is not something.

EFFECTS OF THE INVENTION As described above, according to the inventions set forth in claims 1 to 3, it is possible to automatically discriminate which mode among a plurality of modes is recorded based on a reproduced video signal. Therefore, the operation of switching the manual switch as in the conventional art is completely unnecessary, and the usability can be improved.
In addition, the user will not confuse it with a failure.Furthermore, the carrier frequency corresponding to the pedestal level of each mode will be detected after separation, and the detection signal level of only the pedestal level transmission section will be sampled and held for determination. Since we got the information, the pedestal level occurrence period is longer than the sync tip level occurrence period.
It is possible to obtain a sample hold circuit output that can more reliably determine the recording mode as compared to the determination of the recording mode based on the carrier frequency corresponding to the sync tip level.
Compared with the case of using a detection circuit configured to correct the decrease in the detection output level in the video section, it is possible to quickly output an accurate mode determination signal without impairing the response speed at the time of mode switching, Further, since the sampling pulse generating circuit can be incorporated in an integrated circuit, it has various advantages such as cost advantage.

Further, according to the invention as set forth in claim 4, there is an effect that the equalizer characteristic corresponding to the recording mode can be imparted since it has the equalizer means for imparting the equalizer characteristic according to the recording mode, respectively. Since the mode is directly discriminated from the output signal of the equalizer means, a special signal path for mode discrimination is not required, and the mode discrimination means can be provided in the path for demodulating the modulated frequency video signal, and the equalizer means and the demodulation means can be provided. It has the feature that it can be stored in a single-chip IC.

[Brief description of drawings]

1 to 6 are block system diagrams showing respective embodiments of the device of the present invention, FIG. 7 is a diagram showing a video signal waveform, and FIG. 8 is a frequency spectrum of an FM signal in a standard mode and a high image quality mode. Each of the figures and FIG. 9 is a block system diagram showing an example of a video signal reproducing apparatus having the apparatus of the present invention. 1 ... Reproduction FM luminance signal input terminal, 2, 3 ... Bandpass filter (BPF), 4 ... Demodulation circuit, 5, 6 ... Sample hold circuit (S / H circuit), 10 ... Sampling pulse generation circuit, 11, 13, 15 , 17 ... Comparator, 12 ... Judgment signal output terminal, 16, 18 ... Reference voltage source, 19, 20
... Discrimination matrix circuit, 38 ... Mode discrimination circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Isobe 3-12 Moriya-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Japan Victor Company of Japan (72) Inventor Masahiko Tsuruta 3--12 Moriya-cho, Kanagawa-ku, Yokohama Address within Victor Company of Japan, Ltd. (56) Reference JP-A-61-264981 (JP, A) JP-A-61-88678 (JP, A) Actual development-Sho 62-5775 (JP, U)

Claims (4)

[Claims] 1. A recording medium on which a frequency-modulated video signal is recorded is reproduced in one of n kinds of modes (n is an integer of 2 or more) in which carrier frequencies of the frequency-modulated video signal are different from each other. It is possible to determine the recording mode by detecting the carrier frequency corresponding to the pedestal level of the horizontal blanking period and / or the vertical period of the obtained reproduced frequency-modulated video signal. A device for discriminating a recording mode of a reproduced video signal. 2. A recording medium on which a frequency-modulated video signal is recorded is reproduced in one of n types (n is an integer of 2 or more) of different carrier frequencies of the frequency-modulated video signal. The obtained reproduced frequency-modulated video signal is supplied, and n filter circuits for separately passing the frequency-modulated video signal frequencies corresponding to the pedestal levels of the n kinds of modes, and n filter circuits are provided. Each output signal is supplied separately,
A total of n detection circuits for detecting the envelope and only a pedestal level transmission section of the horizontal blanking period and / or the vertical period elimination period of each output signal of the n detection circuits are provided. Based on at least one of the result obtained by comparing the signal levels with each other and the result obtained by comparing the signal level of the pedestal level transmission section with a preset reference level, respectively. An apparatus for determining a recording mode of a reproduced video signal, which comprises means for outputting a determination signal of the recording mode of the modulated video signal. 3. A reproduced frequency-modulated video obtained by reproducing a recording medium on which the frequency-modulated video signal is recorded in one of two modes in which the carrier frequencies of the frequency-modulated video signal are different from each other. A signal is supplied, and a single filter circuit for passing a frequency-modulated video signal frequency corresponding to each pedestal level of one of the two modes set in advance, and an output signal of the filter circuit are supplied. , A detection circuit for detecting the envelope, and a signal level only in a pedestal level transmission section of a horizontal blanking period and / or a vertical period elimination period of the output signal of the detection circuit and a preset reference level. And a means for outputting a discriminating signal of the recording mode of the reproduced frequency-modulated video signal based on the result obtained by comparing the respective Recording mode discriminating apparatus of the reproduced video signal to. 4. A reproducing means for reproducing the modulated frequency video signal from recording media recorded in n kinds (n is an integer of 2 or more) of recording modes in which carrier frequencies of the modulated frequency video signal are different from each other. An equalizer means for giving an equalizer characteristic to the output signal of the reproducing means according to the recording mode; a demodulation means for demodulating a video signal based on the output signal of the equalizer means; and a frequency component of the modulated frequency video signal An identifying unit that identifies a predetermined period that does not change depending on the pattern based on the video signal demodulated by the demodulating unit, and a frequency component of the output signal of the equalizer unit that corresponds to the certain period identified by the identifying unit is detected. A video signal having a frequency detecting means and a determining means for determining the recording mode based on a detection result of the frequency detecting means. Raw devices.