KR100332795B1 - Analog and digital video cassette recorder and control method - Google Patents

Abstract

The present invention relates to an analog combined digital VR and a control method thereof, and according to the related art, by using only a dedicated head for each data when recording / reproducing data recorded in an analog or digital recording format, an analog signal and a digital format are used. There was a problem that simultaneous recording / playback of data was impossible. Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and in analog to analog recording signal and digital data recording / reproducing analog recording signal and digital format data using a plurality of heads simultaneously or simultaneously A plurality of main heads and auxiliary heads which are optionally recordable / reproducible; A microcomputer that controls the VR and determines a recording / playback path of analog signals and digital data according to whether errors occur during user selection or playback; An analog recording / playback selection unit for selecting the plurality of Esp and PI heads according to a path determined by the microcomputer in a recording / playback mode of an analog recording signal; A digital recording / playback selection unit for selecting the plurality of EPI heads according to a path determined by the microcomputer in a recording / playback mode of digital format data; An analog signal processing unit for processing an input signal in a recording mode so as to be recorded on a magnetic tape and outputting the signal to the analog recording / playback selection unit, and in a playback mode for signal processing to display an output of the analog recording / playback selection unit; In the recording mode, the input signal is processed to be recorded on a magnetic tape and output to the digital recording / playback selection unit. In the playback mode, the digital signal processing unit includes a signal processing to display the output of the digital recording / playback selection unit. A first step of selecting a device and a reproduction path of an analog recording signal or digital format data; A second step of detecting whether an error occurs during playback according to the path selected in the first step, and changing the playback path if an error occurs as a result of the detection; In the second step, if the envelope of the video output is higher than or equal to a predetermined level, playback is performed when the envelope of the video output is higher than or equal to a predetermined level. Otherwise, a third step of changing the playback path is made. By providing a control method, the existing EP head or SP head can be used to simultaneously or selectively record and play analog recording signals and digital format data, thereby reducing the production cost of V-CAL. Simultaneous recording / reproducing of the analog recording signal and the digital format data can compensate for errors occurring during reproduction of one path, thereby providing high quality image quality.

Description

ANALOG AND DIGITAL VIDEO CASSETTE RECORDER AND CONTROL METHOD}

TECHNICAL FIELD The present invention relates to an analog combined digital TV, and in particular, to use an existing main head (for example, SP head) and an auxiliary head (for example, EP head) without using a separate digital recording / playback head. The present invention relates to an analog combined digital VR capable of simultaneously or selectively recording / reproducing analog recording signals and digital format data, and a control method thereof.

Recently, the broadcasting environment provides a digital broadcasting signal using a satellite, etc. in addition to the conventional analog broadcasting signal, and a video cassette recorder (hereinafter referred to as' BCC) which is a device that records / reproduces a broadcasting signal in a time when analog and digital broadcasting are mixed. (VCR) ') is also a trend of analog digital digital TVs, an example of which is Data-Video Home System (hereinafter referred to as' D-VHS') .

FIG. 1 is a block diagram showing a configuration of a reproducing unit of a conventional analog-digital digital VR, and as shown therein, amplifies a signal input from a head D _A , D _B and SP _A , SP _B , EP _A , EP _B. And reproducing amplifier units 1 and 5 for shaping and outputting the shaping unit. Digital and analog signal processing units (2, 6) for signal processing so that the outputs of the reproduction amplifier units (1, 5) can be displayed in a reproducing mode; The digital and analog interface units 3 and 7 output the outputs of the digital and analog signal processing units 2 and 6 to the outside under the control of the digital processing and analog processing microcomputers 4 and 8 in the reproduction mode.

FIG. 2 is a block diagram showing the configuration of a recording unit of a conventional analog combined digital VR. As shown in FIG. 2, digital and external data are received under the control of the digital processing and the analog processing microcomputers 4 and 8 in the recording mode. Analog interface sections 3 and 7; Digital and analog signal processing units (2, 6) for signal processing so that external data input from the digital and analog interface units (3, 7) can be recorded on a magnetic tape; A data converter (10) which formats and outputs the output of the digital signal processor (2) in a predetermined format; Recording which amplifies the outputs of the data converter 10 and the analog signal processor 6 to a predetermined level and records them on a magnetic tape through the heads D _A , D _B and SP _A , SP _B , EP _A , EP _B. The operation of the conventional device, which is composed of the amplifier sections 9 and 11, is thus described.

In the playback mode, the digital processing and analog processing microcomputers 4 and 8 determine whether the data input through the heads D _A , D _B and SP _A , SP _B , EP _A and EP _B are digital format data or analog recording signals. Determine and output the control signal.

That is, when reproducing digital format data, the reproduction amplifier unit 1 reads the data of the magnetic tape through the head D _A or D _B selected by the switch S1, and then stores the data on the amplifiers DP ₁ and DP ₂ . Amplified and shaped to output to the digital signal processor 2, and the digital signal processor 2 processes the signal to display the output of the digital signal processor 2 and then to the outside through the digital interface 3 Output

When reproducing the analog recording signal, the reproduction amplifier unit 5 reads the data of the magnetic tape through the heads SP _A , SP _B , EP _A , and EP _B selected by the switches S2 to S4, and then The amplifiers AP ₁ , AP ₂ , AP ₃ , and AP ₄ are amplified and shaped and output to the analog signal processor 6, and the analog signal processor 6 is used for the reproduction under the control of the analog processing microcomputer 8. Signal processing is performed so that the output of the amplifier unit 5 can be displayed and output to the outside through the interface unit 7.

On the other hand, when external data is input through the digital and analog interface units 3 and 7 in the recording mode, the digital and analog interface units 3 and 7 are input by the control of the digital processing and the analog processing microcomputers 4 and 8. The digital format data is output to the digital signal processing section 2 and the analog recording signal to the analog signal processing section 6 according to the form of the signal.

At this time, when digital format data is input through the digital interface unit 3, the digital signal processing unit 2 outputs the signal of the digital interface unit 3 so as to be recorded on a magnetic tape, and outputs the data. The unit 10 formats the output of the digital signal processing unit 2 into a predetermined format and outputs it to the recording amplifier unit 9, and the recording amplifier unit 9 outputs the amplifiers DP _R1 and DP _R2 . Amplify to a predetermined level at and write to magnetic tape through heads D _A and D _B.

In addition, when an analog recording signal is input through the analog interface unit 7, the analog signal processing unit 6 performs signal processing so that the output of the analog interface unit 7 can be recorded on a magnetic tape. ), And the recording amplifier unit 11 amplifies the signal-processed analog recording signal to a predetermined level in the amplifiers APR1 and APR2, and then through the heads SP _A , SP _B , EP _A , and EP _B. Write on magnetic tape.

Here, in the case of reproduction / recording of the analog signal, the analog processing microcomputer 8 selects the heads SP _A , SP _B or EP _A , EP _B according to the recording method to perform reproduction or recording.

However, in the conventional technology, as described above, only a dedicated head is used for each data when recording / reproducing data recorded in an analog or digital recording format, so that simultaneous recording / reproduction of analog signals and digital signals is impossible. there was. In addition, a separate digital data signal recording and reproducing head is added, which leads to a complicated structure and a price increase of the product.

Therefore, the present invention was created to solve the above-mentioned conventional problems, and does not use a separate digital recording / reproducing head, but uses an existing auxiliary head (for example, an EP head) that is used for analog signal recording and reproducing. It is an object of the present invention to provide an analog combined digital VR and a control method thereof, which enable recording / playback of an analog signal and a digital signal simultaneously or selectively by recording / reproducing an analog recording signal or digital format data by using a.

1 is a block diagram showing a configuration of a reproducing unit of a conventional analog-digital digital VR;

Figure 2 is a block diagram showing the configuration of the recording unit of the conventional analog combined digital VR

Figure 3 is a block diagram showing the configuration of the present invention analog dual digital VR.

Figure 4 is a flow chart showing the operation of the control method of the present invention analog dual digital VR.

5 is a configuration diagram of a two-channel head according to the present invention.

6 is a format diagram of a track according to the present invention;

Fig. 7 is a timing chart of each signal in the recording mode.

FIG. 8 is a spectral diagram showing a recording band of an analog recording signal and digital format data in the recording mode in FIG.

Fig. 9 is a timing chart of each signal when reproducing an analog recording signal in a reproducing mode.

Fig. 10 is a timing chart of each error section and its error section detection signal generated when analog recording signals and digital format data are simultaneously reproduced.

FIG. 11 is a timing diagram showing a process of compensating for an error occurring during reproduction of an analog recording signal in FIG. 10; FIG.

*** Description of the symbols for the main parts of the drawings ***

1: drum 2: magnetic tape

3: Audio track 4: Control signal track

5: analog recording track 6: digital recording track

10: analog recording / playback selector 11, 12, 21: track selector

13: Analog Head Selector 20: Digital Record / Playback Selector

30: analog signal processor 40: digital signal processor

50: formatter 60: interface unit

70: Microcomputer AP _R , DP _R : Amplifier for recording

AP1 to AP4, DP1, DP2: Playback amplifier SP _A , SP _B , EP _A , EP _B : Head

In order to achieve the above object, the present invention provides a plurality of heads capable of simultaneously recording or reproducing analog signals and digital data simultaneously or selectively in a VRL for recording / reproducing analog recording signals and digital format data using a plurality of heads. A head and an auxiliary head; A microcomputer that controls the VR overall and determines a recording / playback path of analog signals and digital data by a user's selection or automatically; An analog recording / playback selection unit for selecting the plurality of main heads and auxiliary heads according to a path determined by the microcomputer in a recording / playback mode of an analog recording signal; A digital recording / playback selection unit for selecting the plurality of EPI heads according to a path determined by the microcomputer in a recording / playback mode of digital format data; An analog signal processing unit for processing an input signal in a recording mode so as to be recorded on a magnetic tape and outputting the signal to the analog recording / playback selection unit, and in a playback mode for signal processing to display an output of the analog recording / playback selection unit; In the recording mode, the input signal is processed to be recorded on a magnetic tape and output to the digital recording / playback selection unit. In the playback mode, the digital signal processing unit includes a signal processing to display the output of the digital recording / playback selection unit. It is characterized by the configuration.

In addition, when the analog signal and the digital format data are simultaneously recorded, the present invention selects and outputs either the reproduction path of the analog recording signal or the digital format data, and if the error is detected during the selection output, the selected reproduction path is changed. It is characterized by changing automatically.

Furthermore, the present invention provides a first step of selecting a reproduction path of an analog recording signal or digital format data; A second step of detecting whether an error occurs during playback according to the path selected in the first step, and changing the playback path if an error occurs as a result of the detection; In the second step, if the envelope of the video output is higher than or equal to a predetermined level, playback is performed when the envelope of the video output is higher than or equal to a predetermined level. Otherwise, a third step is performed to change the playback path to return to the second step. It is characterized by.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing the configuration of the present invention, the analog combined digital V CR, whereby the illustrated analog signals and digital data available at the same time or selectively record / playback head (SP _A, SP _B, EP _A as described, EP _B )Wow; A microcomputer 70 for selecting a recording / reproducing path of the analog recording signal and the digital format data according to an error occurring during selection or reproduction of a user; An analog recording / playback selection unit (10) for selecting the head (SP _A , SP _B , EP _A , EP _B ) according to the path determined by the microcomputer (70) in the recording / playback mode of the analog recording signal; _A digital recording / playback selection unit 20 for selecting the heads EP _A and EP _B according to a path determined by the microcomputer 70 in the recording / playback mode of digital format data; In the recording mode, the input signal is processed to be recorded on the magnetic tape 2 and output to the analog recording / playback selection unit 10. In the playback mode, the output of the analog recording / playback selection unit 10 is displayed. An analog signal processor 30 for signal processing to be possible; In the recording mode, the input signal is processed to be recorded on the magnetic tape 2 and output to the digital recording / playback selection unit 20. In the playback mode, the output of the digital recording / playback selection unit 20 is displayed. A digital signal processor 40 for signal processing to be possible; In the recording mode, the input digital format data is formatted into a predetermined format and output to the digital signal processor 40. In the playback mode, a formatter for restoring the output signal processed by the digital signal processor 40 to its original form ( 50); According to the type of the signal input / output by the control of the microcomputer 70, the analog recording signal is input and output to the outside through the analog signal processor 30, the digital format data is external to the formatter 50 It consists of an interface unit 60 to input and output.

In addition, the present invention also provides a method for controlling an analog-digital digital VR, comprising: a first step of selecting a reproduction path of an analog recording signal or digital format data as shown in FIG. 4; A second step of detecting whether an error occurs during playback according to the path selected in the first step, and changing the playback path if an error occurs as a result of the detection; In the second step, if the envelope of the video output is higher than or equal to a predetermined level, playback is performed when the envelope of the video output is higher than or equal to a predetermined level. Otherwise, a third step is performed to change the playback path to return to the second step. It will be described in detail with reference to the accompanying drawings, the operation and action of an embodiment according to the present invention configured as described above.

Assuming a VCR having two heads, the heads SP _A and EP _B are attached to the drum 1 as shown in FIGS. 5 to 6, and another head SP is disposed at a position of 180 °. _B and EP _A are located, and tracks 3 and 4 on which audio and control signals are recorded are located at the top or bottom of the magnetic tape 2, respectively.

Then, the head SP _A performs recording / reproduction of the analog recording signal to the analog recording track (track A _A ) 5, and the head EP _B paired with the head SP _A performs the digital recording track (track D _A ) ( 6) Recording / playback of analog and digital recording formats is performed.

In the recording mode, when an external input is input through the interface unit 60, the microcomputer 70 outputs a control signal to the interface unit 60 according to a user's selection. The interface unit 60 is controlled by the control signal. The analog output signal is output to the analog signal processor 30 and the digital format data to the formatter 50 according to the format of the input signal.

Similarly, head SP _B records / reproduces analog recording signals and head EP _A records analog and digital format data.

On the other hand, when an analog recording signal is input through the interface unit 60, the analog signal processing unit 30 performs a signal processing so that the input signal can be recorded on the magnetic tape 2, and the analog recording / playback selection unit 10 The analog recording / reproduction selection unit 10 switches the switch SW1 to the R terminal under the control of the microcomputer 70, and then outputs the output of the analog signal processing unit 30 to the recording amplifier (AP). _{A R} is amplified to a predetermined level and recorded on the magnetic tape 2 through the heads SP _A and SP _B.

In addition, when digital format data is input, when the formatter 50 formats the digital signal input through the interface unit 60 in a predetermined format and outputs the digital signal to the digital signal processor 40, the digital signal processor 40 Signal outputs the output of the digital signal processor 40 so that it can be recorded on the magnetic tape 2, and the digital recording / playback selecting unit 20 switches the switch SW2 under the control of the microcomputer 70. After switching to the terminal, the output of the digital signal processor 40 is amplified by the recording amplifier DP _R to a predetermined level and recorded on the magnetic tape 2 through the heads EP _A and EP _B.

That is, when the recording enable signal REC is 'active' as shown in FIG. 7A, the microcomputer 70 is applied according to the vertical synchronization signal V_SYNC of the input signal as shown in FIGS. 7B to 7D. ) Outputs the digital recording control signal DIGITAL_REC and the analog recording control signal ANALOG_REC to record predetermined data on the magnetic tape 2.

At this time, when recording in the digital recording format in order to reduce the interference with the analog data (VHS), the recording band frequency and width are different as shown in FIG.

Meanwhile, according to the user's selection in the playback mode, the microcomputer 70 reproduces analog recording signals or digital format data input through the heads SP _A , SP _B , EP _A , and EP _B. Similarly, the mode selection signal MODE is output.

That is, when reproducing the analog recording signal, the microcomputer 70 switches the switch SW1 to the P terminal and then switches the head SP _A , SP _B or EP _A , EP _B through the analog head selector 13. After the determination, the head selection control signal CTL_H_SW is output as shown in FIG. 9B to switch the first and second track selectors 11 and 12, and as shown in FIG. 9C. Outputs the head amplifier selection control signal CTL_HA_SW to read the data recorded on the magnetic tape 2 through each of the selected heads SP _A , SP _B , EP _A , and EP _B , and reads the read data into the reproduction amplifier AP. ₁ , AP ₂ , AP ₃ , and AP ₄ are amplified to a predetermined level and output to the analog signal processor 30.

Then, the analog signal processor 30 processes the signal to display the output of the analog recording / playback selection unit 10 and outputs it to the outside through the interface unit 60.

In addition, when reproducing digital format data, the microcomputer 70 switches the switch SW2 to the P terminal, and then switches the third track selector 21 to switch the magnetic tape 2 through the heads EP _A and EP _B. ), The read data is amplified to a predetermined level by the reproducing amplifiers DP ₁ and DP ₂ and output to the digital signal processing unit 40.

Then, the digital signal processor 40 processes the signal to display the output of the digital recording / playback selection unit 20, and then restores the original form through the formatter 50 to the external device through the interface unit 60. Will output

In addition, when the analog recording signal and the digital format data are simultaneously reproduced according to the present invention, if the user first selects one of the reproduction paths among the analog recording signal or the digital format data, the microcomputer 70 is shown in FIG. The playback is performed by outputting the head selection control signal CTL_H_SW. During the reproducing, the microcomputer 70 loses the reproduction RF RF as shown in FIG. 10 (b) or (d) of FIG. As described above, it is checked whether an output level is abnormally down or a section in which a parity code detection error or a decoding error occurs, as shown in FIGS. 10 (f) to 10 (g). .

That is, in the section in which the reproduction RF (RF) is missing or the output level is abnormally down, the error sections are detected by the reproduction amplifiers AP ₁ and AP ₂ and the analog signal processing unit 30, and then, as shown in FIGS. As shown in (e), the missing section detection signal DOC_DET or the level detection signal ENV_DET is transmitted to the microcomputer 70, and a section in which a parity code detection error or decoding error occurs during digital data reproduction occurs. 70 detects.

Then, in response to the error section, the microcomputer 70 changes the playback path. If an error is detected as shown in FIG. 11A during playback of the analog recording signal, the detected section is shown in FIGS. Signal processing is performed by replacing the data input through the digital reproduction path as shown in c).

Similarly, if an error is detected during reproduction of digital format data, the data corresponding to the error section is replaced with data input through an analog path for signal processing.

At this time, if the error section no longer occurs, the input data is signal-processed to perform playback, and during playback, it is checked whether the envelope of the video output is at or above a predetermined level (K).

If the envelope does not exceed the predetermined level K as a result of the check, the reproduction path is changed to perform the reproduction.

Here, the microcomputer 70 records / reproduces digital format data by using an existing EP head, and simultaneously records / reproduces digital format data by using the EP head. Using the head, analog recording signals can be recorded and played back, so that analog recording signals and digital format data can be recorded or played back simultaneously or selectively during recording and playback.

As described above, the present invention enables the simultaneous recording of analog recording signals and digital format data or selective recording / playback using existing EP heads or SP heads, thereby reducing the production cost of VR. In addition, it is possible to compensate for errors occurring during reproduction of one path by simultaneous recording / reproducing of analog recording signals and digital format data, thereby providing high quality images.

Claims (5)

A VLC for recording / reproducing analog recording signals and digital format data using a plurality of heads, comprising: a plurality of main heads and auxiliary heads capable of simultaneously or selectively recording / reproducing analog signals and digital data; A microcomputer that controls the entire VR and determines a recording / playback path of analog signals and digital data according to a user's selection or automatically; An analog recording / playback selection unit for selecting the plurality of main heads and auxiliary heads according to a path determined by the microcomputer in a recording / playback mode of an analog recording signal; A digital recording / playback selection unit for selecting the plurality of auxiliary heads according to a path determined by the microcomputer in a recording / playback mode of digital format data; An analog signal processing unit for processing an input signal in a recording mode so as to be recorded on a magnetic tape and outputting the signal to the analog recording / playback selection unit, and in a playback mode for signal processing to display an output of the analog recording / playback selection unit; In the recording mode, the input signal is processed to be recorded on a magnetic tape and output to the digital recording / playback selection unit. In the playback mode, the digital signal processing unit includes a signal processing to display the output of the digital recording / playback selection unit. The analog combined use digital VR characterized by the above-mentioned. 2. The digital mixed digital signal of claim 1, wherein the analog digital digital signal is formatted in a predetermined format in the recording mode and outputs the digital format data to the digital signal processor, and outputs the signal processed by the digital signal processor in the playback mode. An analog combined digital VR comprising the formatter for restoring in the form of a. According to claim 1 or claim 2, Analog-to-digital digital VR is an analog recording signal input / output to the outside through the analog signal processing unit according to the form of the signal input / output by the control of the microcomputer, digital The format data is an analog-to-digital VR, characterized in that it further comprises an interface unit for input and output to and from the outside through the formatter. When the analog signal and the digital format data are recorded at the same time, one of the reproduction paths of the analog recording signal or the digital format data is selected and outputted, and if an error is detected during the selective output, the selected reproduction path is automatically changed. Analog combined digital VR control method Selecting a reproduction path of an analog recording signal or digital format data; A second step of detecting whether an error occurs during playback according to the path selected in the first step, and changing the playback path if an error occurs as a result of the detection; In the second step, if the envelope of the video output is higher than or equal to a predetermined level, playback is performed when the envelope of the video output is higher than or equal to a predetermined level. Otherwise, a third step is performed to change the playback path to return to the second step. An analog combined digital VR control method characterized by the above-mentioned.