JPH08315502A - Magnetic recorder/reproducer - Google Patents

Abstract

PURPOSE: To obtain a good reproduction signal by providing means for, respectively, receiving, encoding, adding, recording, recording/reproducing, reproducing and decoding the signal and regulating a reproduced signal based on a reproduction information code signal. CONSTITUTION: Tuners 1, 2 convert a received signal into a signal suitable for magnetic recording/reproduction before outputting the signal. Switching means 3, 4 are interlocked with an input command from a user to switch the signals before being outputted. The switching means 3 outputs an information signal 3a to an adder 7 while the switching means 4 outputs a signal 4a to an encoder 5. The encoder 5 converts a signal 1b, received from the means 4, into a digital data and a converted information code signal 5a is outputted to an adder 7. The adder 7 adds the signals 3a from the means 3 to the information code signal 5a to produce an added signal 7a which is sent to a FM modulation means 8. The FM modulation means 8 sends a part of the signal 7a to an amplifier 9 which sends a signal, having variable level, to means 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a VTR for performing appropriate signal recording / reproducing according to the S / N of a signal to be recorded and the characteristics of a recording medium. .

[0002]

2. Description of the Related Art Various magnetic recording / reproducing devices such as VTRs, which have been widely spread at present, have been variously devised to provide high-quality video signals. As such a magnetic recording / reproducing apparatus, a test signal is recorded / reproduced on / from a recording medium such as a magnetic tape, and the obtained signal is detected to determine the performance (magnetic characteristic, etc.) of the recording medium to obtain an appropriate recording characteristic. There is a magnetic recording / reproducing apparatus having an auto-calibration function of setting.

In addition, when an information signal is subjected to a recording process and recorded on a magnetic recording medium, it is always appropriate when it is used for reproducing the information signal by another device of the recorded magnetic recording medium. And a magnetic recording device capable of avoiding a situation in which an appropriate reproduction information signal cannot be obtained due to a difference in signal processing characteristics during reproduction, and A magnetic reproducing device (Japanese Patent Laid-Open No. 5-325407) has been proposed.

That is, such a magnetic recording device and / or magnetic reproducing device records the code data representing the identification information for identifying the individual devices together with the signal to be recorded, even if the devices are of the same model, thereby recording the code data. Since each device can be identified from the identification information during reproduction, the difference between the magnetic characteristics of the individual devices having individual differences is corrected to obtain an appropriate reproduction information signal.

[0005]

However, the above-mentioned auto-calibration function is for performing a correction at the time of signal recording of the magnetic recording / reproducing apparatus that discriminates the performance of the recording medium and variably controls the recording characteristics. It does not adjust the reproduction of the signal. In the magnetic recording device and / or the magnetic reproducing device, a recording information signal is recorded from a magnetic recording medium on which a recording information signal obtained by adding code data representing predetermined identification information to an information signal is recorded. Is to control the process for the reproduction information signal obtained by reading out, and not to adjust the recording of the signal to be recorded. That is, each has a function that works only during recording or reproduction, and there is a disadvantage that the effect is low.

For example, when the signal to be recorded is a broadcast signal, the S / N of the signal may be deteriorated depending on the received signal state, and the above-described auto-calibration function depends on the magnetic characteristics of the magnetic tape. Since only recording adjustment is performed, there is a problem that the S / N of the signal is not improved.

Further, nothing is mentioned about the correction operation at the time of recording or reproducing for signal deterioration related to the above-mentioned magnetic recording apparatus and / or magnetic reproducing apparatus. In addition, the above-described auto-calibration is performed in each mode (for example, "standard mode" or "long-time mode depending on the running speed of the magnetic tape" because the result of the recording adjustment is stored and held in the RAM of the microcomputer or the like. )), The number of memories corresponding to the above is required, and since this is controlled, there is a disadvantage that the configuration becomes complicated. Therefore, in order to solve the above problems, it has been desired to develop a signal recording / reproducing apparatus that corrects the S / N of a signal to be recorded and performs appropriate signal recording / reproducing during recording and reproduction.

[0008]

In order to solve the above-mentioned problems, the present invention provides a signal reproducing device having the following configurations (1) to (3).

(1) A first aspect of the present invention is a magnetic recording / reproducing apparatus for recording a received broadcast signal on a magnetic tape T and reproducing the recorded signal, wherein the broadcast signal is received,
Receiving means 1, which outputs the main information signals 1a, 1b, 3a and the received information signals 2a, 2b, 3a according to the reception state of the broadcast signal 1,
2, and an encoding means (encoder) for rewriting and outputting the received information signals 2a, 2b, 3a into a predetermined information code signal 5a
5, the information code signal 5a, the addition means 7 for obtaining the addition signal 7a by adding the information signal 1a, 1b, 3a to be recorded, for the predetermined magnetic recording to the addition signal 7a And a recording / reproducing means 11 for recording the output signals of the recording signal processing means 8, 9, 10 on the magnetic tape T and reproducing the signals recorded on the magnetic tape T. , Reproduction signal processing means 12, 13, 14, 15 for subjecting the output signal of the recording / reproducing means 11 to predetermined reproduction processing, and the information code signal 5a separated and reproduced from the outputs of the reproduction signal processing means 14, 15. A decoding means (decoder) 16 for outputting the reproduction information code signals 16a, 16b, and the reproduction signal processing means 14, 15 based on the reproduction information code signals 16a, 16b.
The present invention provides a magnetic recording / reproducing apparatus characterized by performing reproduction adjustment of the above.

(2) The second aspect of the present invention is to use the magnetic tape T based on the signal information reproduced by the recording / reproducing means 11.
Discriminating means (auto-calibration) 6 for discriminating the performance according to the magnetic characteristic of the magnetic tape, and control means for setting and controlling the signal recording characteristic according to the magnetic characteristic of the magnetic tape T based on the discrimination result of the auto-calibration 6. (Auto calibration) 6. The magnetic recording / reproducing apparatus according to (1) above is provided.

(3) According to a third aspect of the present invention, the discrimination result of the discriminating means 6 is rewritten by the encoding means 5 into a predetermined information code signal, and the information code signal and the information signal to be recorded are recorded. Add and record / reproduce this, and the reproduction signal processing means 14, 1 based on the reproduction information code signal.
(5) The magnetic recording / reproducing apparatus as described in (3) above, which is characterized by performing reproduction adjustment.

[0012]

FIG. 1 is a block diagram for explaining a magnetic recording / reproducing apparatus according to the present invention, and FIG. 2 is a waveform diagram for explaining an addition signal. The signal reproducing apparatus according to the present invention will be described below with reference to the drawings. The same components as those described above are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1, the magnetic recording / reproducing apparatus according to the present invention is, for example, a terrestrial wave or satellite broadcast (so-called BS (B
Roadcasting Satellite) Broadcast) First to receive each wave,
Second tuners 1 and 2, switching means 3 for outputting either one of the reception signals 1a and 2a received by the first and second tuners 1 and 2 as an information signal 3a based on an input instruction from a user (not shown), In conjunction with the switching output operation of the switching means 3, the first,
The switching means 4 for outputting either one of the signals 1b and 2b corresponding to the reception status of the signals received by the second tuners 1 and 2 as the reception status signal 4a, and the output of the switching means 4 is converted into a predetermined information code signal 5a. An encoder 5 for converting and outputting, an adding means 7 for outputting an addition signal 7a obtained by adding the information code signal 5a and the information signal 3a, an FM modulating means 8, FM for performing frequency modulation for converting the addition signal 7a into a recording signal. A recording amplifier 9 for amplifying the modulated recording signal to a predetermined recording level, a recording / reproducing means 10 for recording and reproducing the recording signal output from the recording amplifier 9 on the magnetic tape T, and a signal reproduced by the recording / reproducing means 10. A preamplifier 11 that amplifies 10a to a predetermined level and outputs a flat frequency characteristic from the low frequency band to a high frequency band, and an FM demodulation means 1 that demodulates the reproduction signal amplified by the preamplifier 11 and outputs a video signal. 2. A noise reduction circuit 13 for removing a noise component of the video signal demodulated by the FM demodulation means 12, a signal for decoding the above-mentioned information code signal included in the video signal 13a from which a noise component has been removed, and based on the read content. And a decoder 14 for generating and outputting a control signal for controlling the operation of the noise reduction circuit 13 described above.

At this time, the above-mentioned first and second tuners
The reception signals 1a and 2a output from 1, 2 are, for example, composite video signals or audio signals. The above-mentioned information code signal 5a is added by the adding means 7 to the luminance signal component of the composite video signal, and the color signal included in the composite video signal is low-frequency converted by a signal processing system (not shown here), and FM is generated. It is frequency-multiplexed with the modulated luminance signal and supplied to the recording / reproducing means 11. Further, the audio signals included in the received signals 1a and 2a are converted into signals having a frequency band different from that of the recording signal by the audio signal processing means (not shown).
It is M-modulated and recorded in the deep layer of the magnetic tape T by the recording / reproducing means 11.

Now, the recording operation of the magnetic recording / reproducing apparatus will be described first, and then the reproducing operation will be described.

(Recording operation) The first and second tuners 1 and 2 described above receive a broadcast signal and convert it into a signal suitable for a transmission system for magnetic recording / reproduction. At this time, the user sends a desired broadcast signal to the magnetic tape T by input means (not shown).
An operation instruction (for example, button operation) for recording is performed. For example, it is assumed that the user specifies the channel of the signal received by the first tuner 1. In conjunction with this input instruction, the switching means 3 and 4 switch and output the reception signal 1a and the signal 1b corresponding to the reception state from the first tuner 1, respectively.

The information signal 3a output from the switching means 3 is supplied to the adder 7, and the reception state signal 4a output from the switching means 4 is supplied to the encoder 5. At this time, the reception state signal 4a is, for example, a signal corresponding to the detection output of the first and second tuners 1 and 2, and corresponds to the S / N of the received signal. For example, the first and second tuners 1 and 2 are equipped with a compensating circuit for compensating the strength of the radio wave induced in an antenna (not shown) to obtain a constant detection output, and the received signal is a terrestrial broadcast wave. If so, the electric field strength of the received signal is detected, and if it is a satellite broadcast wave, the C / N of the received signal is detected.
(Carrier to Noise ratio; carrier power to noise power ratio) is detected to compensate the received signal. The detection output is supplied to a tuner indicator (not shown) or the like to visually display the reception state.

The encoder 5 converts the signal 1b output from the switching means 4, that is, the reception state signal 4a into predetermined digital data. As an example of the conversion, for example, a 2-bit digital signal depending on the voltage level of the reception state signal 4a (for example, in this case, the voltage level has four levels (0,0) (0,1) (1,0) (1,
It is divided into 1) and expressed). Here, it goes without saying that the above digital signal is not limited to 2-bit information, and may be set to represent the voltage corresponding to the received S / N more finely (for example, 3 bits or more).

The encoder 5 supplies the information code signal 5a obtained by converting the reception state signal into digital data to the adder 7. The adder 7 supplies an addition signal 7a obtained by adding the information signal 3a from the switching means 3 and the information code signal 5a to the pre-emphasis circuit 8. Here, as shown in FIG. 2, the adder 7 superimposes the information code signal 5a which is digital data in the vertical blanking period of the video signal which is the information signal 3a. As is well known, since there is no video information in the vertical blanking period, information such as a teletext signal and a broadcast test signal is inserted. The digital data described above is also superimposed on a predetermined horizontal period like this information. be able to.

If the above information code signal is superimposed on a horizontal period different from the character signal information and the test signal information, the character broadcast signal, the test signal, etc. can be taken out without being affected by the information code. . Therefore, the magnetic recording / reproducing apparatus having no means for detecting the information code signal can reproduce the video signal from the magnetic tape on which the information code signal is recorded, so that the compatibility can be maintained.

The FM modulator 8 supplies a recording amplifier 9 with a recording signal obtained by frequency-modulating the luminance signal component of the addition signal 7a. The recording amplifier 9 changes the recording level of the recording signal and supplies it to the recording / reproducing means 10.

The recording signal is supplied to the rotary head which constitutes the recording / reproducing means 10, and the rotary head scans the magnetic tape T to record the recording signal while forming a predetermined tape pattern. Further, in the recording operation described above, the recording of the reception signal from the first tuner 1 is described, but the reception signal from the second tuner 2 is recorded in the same manner.

(Reproduction Operation) The user gives an operation instruction (for example, button operation) for reproducing the signal recorded on the magnetic tape T by an input means (not shown). The rotary head which constitutes the recording / reproducing means 10 supplies the reproduction signal 10a detected by scanning the magnetic tape T to the preamplifier 11. The preamplifier 11 amplifies the reproduction signal 10a to a predetermined level and then supplies it to the FM demodulation means 12. FM demodulation means
Reference numeral 12 has a configuration complementary to the FM modulation means 8 described above, and demodulates the frequency-modulated signal into the original signal. The demodulated signal is supplied to the noise reduction means 13. The noise reduction means 13 removes a noise component having no correlation with the video information by utilizing, for example, frame correlation or line correlation of the video signal.

The reproduced video signal 13a output from the noise reduction means 13 is supplied to a transmission line (not shown) and the decoder 14. The decoder 14 decodes the digital data superimposed in the vertical blanking period of the reproduced video signal 13a. For example, the decoder 14 is preset with a control signal for controlling the operation of the noise reduction means 13 according to the digital data, and controls the operation of the noise reduction means 13 according to the digital data decoded from the reproduced video signal. To do.

For example, when the S / N of the received signal is not good, it is considered that the video signal is recorded on the magnetic tape T in a state in which there are many noise components. Therefore, the noise reduction is strongly performed to remove the noise. . On the contrary, when the S / N of the received signal is good, the operation of the noise reduction means 13 is suppressed so that the fine information of the reproduced image is not lost.

In this way, since the digital data representing the reception state is superimposed and recorded on the signal recorded on the magnetic tape T, it becomes possible to control the noise reduction according to the S / N of the recorded signal, A good video signal can always be obtained.

Now, the auto-calibration means 6 will be described. The auto-calibration means 6 records, for example, a detection signal supplied from a signal generation means (not shown here) on the magnetic tape T and reproduces it. The optimum recording characteristic setting is performed by detecting the signal characteristic (reproduction signal 10a) at that time. Since a signal is actually recorded on the magnetic tape T before recording a desired video signal, it is possible to set the recording characteristics in consideration of the performance of the tape.

The automatic calibration means 6 discriminates the magnetic characteristic of the magnetic tape from the signal characteristic detected as described above, and supplies the discrimination result 6b to the encoder 5. The encoder 5 converts the discrimination result 6b into digital data in the same manner as described above and supplies it to the adding means 7. In this way, the adding means 7 can add the digital data representing the magnetic characteristics of the magnetic tape T to the information signal 3a.
By recording 7a, the information signal and the discrimination result of the magnetic characteristics of the magnetic tape T are recorded on the magnetic tape T. That is, as described above, the determination result of the auto-calibration means can be directly recorded on the magnetic tape T without storing the determination result of the auto-calibration means in the RAM of the microcomputer or the like, so that the memory conventionally required can be omitted. Further, even when a signal is newly recorded on the magnetic tape T, the above-mentioned discrimination information of the magnetic tape T can be detected, so that the recording level can be optimized instantly. Here, for example, as a specific example of the recording characteristic setting, there is a recording level setting or the like.

The above-mentioned magnetic recording / reproducing apparatus detects digital data representing the reception state of the received signal during reproduction, and performs reproduction adjustment of the reproduced video signal based on the detected digital data to obtain a good reproduced video signal. . Further, since the auto-calibration means 6 can discriminate the magnetic characteristic of the magnetic tape for optimum recording characteristic setting and record the discrimination result on the magnetic tape, the constitution of the memory or the like which is conventionally required is omitted. be able to. Furthermore, since the magnetic recording / reproducing of a good signal is performed by controlling the optimum recording / reproducing state for the digital data, it is possible to simultaneously perform the magnetic recording / reproducing of a good video signal by using these together. Of course, it is okay. That is, the optimum recording characteristics are controlled by the auto-calibration means at the time of recording, and the reproduction adjustment of the signal to be reproduced can be performed by detecting the information of the reception state and the magnetic characteristics of the recording medium at the time of reproduction.

In this embodiment, the detection of the information indicating the reception state when the broadcast signal is received has been described. However, for example, S / S of a signal supplied by an external input or the like is used.
Of course, N may be detected and an information signal corresponding thereto may be recorded on the magnetic tape T together with the video signal, and at the time of reproduction, reproduction adjustment of the recorded signal may be performed based on this information signal.

In the present embodiment, the noise reduction means 13 has been described as means for performing reproduction adjustment. For example, various reproduction such as sharpness control for variably controlling the frequency characteristic of the video signal or emphasizing image details. Of course, it may be adjustment.

[0032]

As described above, according to the configuration of the present invention as set forth in claim 1, the addition obtained by adding the reception signal and the reception information signal representing the reception state according to the S / N of the reception signal. By recording the signal on the magnetic medium, it becomes possible to detect the reception state of the received signal during reproduction and adjust the reproduction of the reproduction signal accordingly, so that a good reproduction signal can always be obtained. effective.

As described above, according to the configuration of the present invention as set forth in claim 2, in addition to the above effects, the magnetic characteristic of the magnetic medium is detected and the optimum recording characteristic is set based on the magnetic characteristic. There is an effect that it is possible to perform optimum signal recording / reproducing in consideration of the magnetic characteristics of.

As described above, according to the configuration of the present invention as set forth in claim 3, in addition to the above-mentioned effect, the result is added to the signal to be recorded in order to detect the magnetic characteristic of the magnetic medium and store the result. Since it is possible to superimpose and record on the magnetic medium, it is possible to omit the storage means conventionally required. Further, there is an effect that it is possible to obtain the respective determination results according to the magnetic medium and the recording mode, and to perform more detailed reproduction adjustment according to the determination results.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a waveform diagram for explaining an addition signal.

[Explanation of symbols]

1, 2 ... Receiving means, 5 ... Encoding means, 8, 9, 10
... recording signal processing means, 11 ... recording and reproducing means, 12, 1
3, 14, 15 ... Reproduction signal processing means, 16 ... Decoding means, T ... Magnetic medium.

Claims (3)

[Claims] 1. A magnetic recording / reproducing apparatus for recording a received broadcast signal on a magnetic medium and reproducing the recorded signal, wherein the broadcast signal is received, and a main information signal and a reception state of the broadcast signal are received. A reception unit that outputs a reception information signal, an encoding unit that rewrites and outputs the reception information signal into a predetermined information code signal, and an addition signal by adding the information code signal and the information signal to be recorded. An adding means for obtaining the signal, a recording signal processing means for subjecting the added signal to a predetermined signal processing for magnetic recording, an output signal of the recording signal processing means for recording on the magnetic medium, and a signal recorded on the recording medium. Recording / reproducing means for reproducing the information, reproducing signal processing means for subjecting the output signal of the recording / reproducing means to a predetermined reproducing process, and output of the reproducing signal processing means from the information A magnetic recording / reproducing apparatus comprising: a decoding unit for outputting a reproduction information code signal obtained by separating and reproducing the read signal, and performing reproduction adjustment of the reproduction signal processing unit based on the reproduction information code signal. 2. A discriminating means for discriminating a performance according to a magnetic characteristic of the magnetic medium based on signal information reproduced by the recording / reproducing means, and a magnetic characteristic of the magnetic medium based on a discrimination result of the discriminating means. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising a control means for setting and controlling a signal recording characteristic according to the control. 3. The reproduction result code is obtained by rewriting the discrimination result of the discriminating means into a predetermined information code signal by the encoding means, adding the information code signal and the information signal to be recorded, and recording / reproducing the same. 3. The magnetic recording / reproducing apparatus according to claim 2, wherein reproduction adjustment of the reproduction signal processing means is performed based on a signal.