JPH0380781A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To set the optimum recording system or tape format without necessitat ing the change of the height of a reproducing head by providing first and second reproducing heads, and performing preceding reproduction with the first reproduc ing head and simultaneous reproduction with the second reproducing head. CONSTITUTION:The second reproducing head 72 is arranged at height h2 at a position succeeding a recording head 5, and the simultaneous reproduction for a signal immediately after recorded is performed in ordinary recording. A switch 11 is the one to switch the first and second reproducing heads 71, 72, and is connected to R side in the simultaneous reproduction, and the repro ducing signal of the second reproducing head 72 is selected. In ordinary reproduc tion, the signal reproduced with the first reproducing head 71 arranged at a position preceding by a time equivalent to height h1 is reproduction-processed similarly in the simultaneous reproduction, and the signal taking the same timing with a queue signal or a time code can be obtained at an output terminal 10. Therefore, it is possible to set the optimum format not being affected by a signal processing system or track pitch.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention can be used in video and audio signal recording and reproducing devices such as VTRs.

2. Description of the Related Art In recent years, video/audio signal recording and reproducing devices such as VTRs have been designed to achieve higher image quality and higher sound quality, and are transitioning from conventional analog recording to digital recording. In a digital VTR that digitally records video and audio signals, after converting an input analog signal to digital, the data is shuffled within a certain period of time and is recorded with an error correction code added thereto.

During playback, errors are corrected based on the error correction code and the scattered data is returned to its original state (deshuffling).
After that, it is converted to an analog signal and output. in this way,
Since processing is performed in units of a fixed period, time is required for the processing during recording and reproduction. This processing is performed in units of 173 fields or 1 field of the video signal. On the other hand, VTRs simultaneously record analog audio signals (cue signals) and time codes in addition to digital signals. Since there is no time delay like digital signals when recording and reproducing these cue signals and time codes, when recording and reproducing them using the same head, the problem arises that the digitally recorded signals lag behind the cue signals and time codes. . To solve this problem, there is a method for reproducing digital signals using a reproducing head that precedes the recording head.

Furthermore, in order to check the recording state during recording, VTRs for broadcasting, etc., are required to have a simultaneous playback function that allows recording and playback at the same time.

With a VTR that has a pre-play function, when editing, it is possible to process the playback signal by mixing the pre-play signal and the signal to be recorded next, or by switching with a cross-fade, and then re-recording the signal at the same position as the original. .

An example of a recording/reproducing apparatus having such a function is shown in FIG. In FIG. 4, a signal input to a signal input terminal 1 is led to a recording signal processing circuit 3 via a mixer 2, and is subjected to processing necessary for recording. Recording head 5
The data is recorded on tape 6 through the process. During normal recording, the mixer 2 simply operates as a bypass. The reproducing head 7 is mounted on a movable element (not shown), is placed at a position later than the recording head 5 during normal recording, and simultaneously reproduces signals immediately after being recorded. The reproduced signal is led to the reproduced signal processing circuit 9 through the reproduced amplifier 8, and after being subjected to reproduction processing, is outputted from the output terminal 10, and the recording state is confirmed.

During normal reproduction, the reproducing head 7 is placed in a position ahead of the recording head 5 by a time corresponding to the total processing time for recording and reproducing signals to be digitally recorded and reproduced by the operation of the movable element. The signal reproduced from the reproduction head 7 is
Reproduction processing is performed in the same manner as during simultaneous reproduction, and a signal whose timing matches the cue signal and time code is obtained at the output terminal 10.

During advance playback editing, the playback head 7 is placed at the same position as during normal playback, and the signal processed by the playback signal processing circuit 9 is
The signal is guided to the mixer 2, mixed with the signal input to the input terminal 1, and cross-fade switched, and then sent to the recording signal processing circuit 3.
．． Recording amplifier4. The information is recorded on the tape 6 through the recording head 5.

Problem to be Solved by the Invention However, in the configuration shown in FIG. 4, it is necessary to attach the playback head 7 to a movable element and change the height during normal playback, advance playback editing, and simultaneous playback. The amount becomes larger as the unit of shirt ring becomes longer, that is, as the recording and reproduction signal processing time becomes longer, and as the track pitch becomes wider. Therefore, in order to realize both advance playback and simultaneous playback with this configuration, there are restrictions on the signal processing method (unit of error correction and shuffling) and track pitch. Furthermore, simultaneous playback during advance playback and editing is not possible.

An object of the present invention is to provide a device that solves these problems.

Means for Solving the Problems In order to achieve the above object, the signal recording and reproducing device of the present invention includes a pair of recording heads attached to a rotating surface at the same height,
The recording head has a first reproducing head attached to a rotating surface at a height preceding the recording head, and a second reproducing head attached to a rotating surface at a height following the recording head.

Further, in the signal recording and reproducing apparatus of the present invention, during normal recording, the signal processed by the recording signal processing section is recorded by the recording head, and the signal reproduced by the second reproduction head is processed by the first reproduction signal processing section. How to obtain the output when pre-playing and editing:
The signal reproduced by the first reproduction head is processed by the first reproduction signal processing section to obtain an output, and after mixing or switching the output signal with the input signal, it is processed by the recording signal processing section and recorded by the recording head. and means to do so.

Furthermore, during normal recording, the signal recording and reproducing device of the present invention records the signal processed by the recording signal processing section in the recording head, and processes the signal reproduced by the second reproduction head in the second reproduction signal processing section. Means for obtaining an output: During advance playback editing, the signal played back by the first playback head is processed by the first playback signal processing unit to obtain an output, and the output signal is mixed or switched with the input signal, and then recorded. and means for obtaining an output obtained by processing a signal in the signal processing section, recording it in the recording head, and reproducing it in the second reproduction head in the second reproduction signal processing section.

Effect: A first reproducing head and a second reproducing head are provided, and preliminary reproduction is performed by the first reproducing head, and simultaneous reproduction is performed by the second head, thereby eliminating the need to change the height of the reproducing head.
You can set the tape format with the optimal recording method and track pitch. In addition, two playback signal processing units are provided, and the output signal processed by the first playback signal processing unit during pre-playback editing is mixed with the input signal, processed by cross-fade switching, etc., and recorded again, and simultaneously played back. The output can be obtained by processing the output in a second reproduction signal processing section.

Embodiment Fig. 1 shows a block diagram of an embodiment of the present invention, Fig. 2 shows the head arrangement on the rotating cylinder at that time, and Fig. 2 (
2(a) is a plan view, and FIG. 2(b) is a front view.

In FIG. 1, the same components as in FIG. 4 are represented by the same numbers and perform the same operations. In FIG. 2, A, A' are recording heads, B1. Bl' is the first playback head, B2,8
2' is a second reproducing head.

As in the case of FIG. 4, the signal input to the signal input terminal 1 is led to the recording signal processing circuit 3 via the mixer 2, where it is subjected to the processing necessary for recording, and then to the recording amplifier 4. The information is recorded on the tape 6 through the recording head 5. During normal recording, the mixer 2 simply operates as a bypass. The second reproducing head 72 is arranged at a position behind the recording head 5 (corresponding to the height h2 in FIG. 2(b)), and during normal recording, it simultaneously reproduces the signal immediately after being recorded. The reproduction signal is sent to the R terminal of the switch 11 and the reproduction amplifier 8. The signal is led to the reproduction signal processing circuit 9 through the V terminal of the switch 12, and after being subjected to reproduction processing, is outputted from the output terminal 10 to confirm the recording state. The switch 12 is a switch for switching between outputting the signal that has passed through the circuit system (EE system) or outputting the reproduced signal. During E-E, turn to E side, during playback, and during simultaneous playback,
Connected to the V side. Further, the switch 11 is a switch for switching between the first playback head 71 and the second playback head 72, and during simultaneous playback, it is connected to the R side and the playback signal of the second playback head 72 is selected.

During normal playback, the time corresponding to the total processing time for recording and playing back digitally recorded and played signals (see Figure 2 (b)
The signal reproduced by the first reproducing head 71 placed ahead by a height hl (corresponding to the height hl) is transmitted to the switch 1.
1, the signal is reproduced in the same manner as during simultaneous reproduction, and a signal whose timing matches the cue signal and time code is obtained at the output terminal 10.

During advance playback editing, playback is performed from the first playback head 71, the P terminal of the switch 11, the playback amplifier 8° switch 12
The signal processed by the reproduction signal processing circuit 9 via the V terminal of
．． Recording is performed on a tape 6 through a recording amplifier 4° and a recording head 5.

Next, FIG. 3 shows another embodiment of the present invention. In FIG. 3, the same components as in FIG. 4 and FIG. 1 are represented by the same numbers and operate in the same way. Note that the head arrangement on the rotating cylinder is the same as in FIG. 2.

As in the case of FIG. 1, the signal input to the signal input terminal 1 is led to the recording signal processing circuit 3 via the mixer 2, where it is subjected to the processing necessary for recording, and then to the recording amplifier 4. The information is recorded on the tape 6 through the recording head 5. During normal recording, the mixer 2 simply operates as a bypass. During normal recording, the position is located behind the recording head 5 (height h2 in FIG. 2(b)).
The second reproducing head 72 located at the second reproducing head 72 simultaneously reproduces the signals immediately after being recorded. The reproduction signal is the second
regenerative amplifier 82. through the V terminal of switch 12
After being led to the reproduction signal processing circuit 92 and subjected to reproduction processing, it is output from the second output terminal 102 to confirm the recording state.

During normal playback, the time corresponding to the total processing time for recording and playing back digitally recorded and played signals (see Figure 2 (b)
The signal reproduced by the first reproducing head 71 placed ahead by a height hl) passes through the first reproducing amplifier 81 and is reproduced by the first reproduced signal processing circuit 91. A signal whose timing matches the cue signal and time code can be obtained at the output terminal 101 of No. 1.

During advance reproduction editing, the signal reproduced from the first reproduction head 71, passed through the first reproduction amplifier 81, and processed by the first reproduction signal processing circuit 91 is guided to the mixer 2 and input to the input terminal 1. The input signal is mixed and cross-fade switched, and then sent to the recording signal processing circuit 3. Recording amplifier4. The information is recorded on the tape 6 through the recording head 5. At the same time, the signal reproduced by the second reproducing head 72 is transmitted to the second reproducing amplifier 82. The signal is reproduced by the second reproduction signal processing circuit 92 via the V terminal of the switch 12, and is output from the second output terminal 1σ2, thereby confirming the recording state.

In FIG. 3, it is also possible to provide only one of the first output terminal 101 and the second output terminal 102, and to switch between the two and output the one required as the output. That is, the configuration may be such that the output of the first reproduction signal processing circuit 91 is output during normal reproduction, and the output of the second reproduction signal processing circuit 92 is output during EE and simultaneous reproduction.

Further, in FIGS. 1 and 3, the mixer 2 can be a general-purpose mixer installed outside the recording/reproducing apparatus.

Effects of the Invention As explained above, according to the present invention, there is no need to change the mounting height of the head during normal playback, advance playback editing, and simultaneous playback, and the head installation is optimized regardless of the signal processing method or track pitch. tape format can be set.

Further, by providing two reproduction signal processing circuits, it is possible to reproduce and confirm the signal immediately after being recorded at the same time as recording even during advance reproduction editing, and reliable and efficient editing can be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a plan view showing the head arrangement on a rotating cylinder in the same embodiment, and FIG. 3 is a block diagram showing another embodiment of the present invention.
FIG. 4 is a block diagram showing a conventional example. 2... Mixer, 3... Recording signal processing circuit, 4...
...recording amplifier, 5...recording head, 71.
...first reproducing head, 72...second reproducing head, 8.81...first reproducing amplifier, 82...
2nd regenerative amplifier, 9.91... 1st reproduced signal processing circuit, 92... 2nd reproduced signal processing circuit.

Claims (3)

[Claims] (1) A helical scan signal recording and reproducing device for recording and reproducing signals on a magnetic tape, which includes a pair of recording heads attached to a rotating surface at the same height, and a pair of recording heads at a height preceding the recording head. It is characterized by having a first reproducing head attached to a rotating surface for use in normal reproduction, and a second reproducing head used for simultaneous recording and reproducing attached to a rotating surface at a height that follows the recording head. Signal recording and reproducing device. (2) During normal recording, while the recording head records the signal processed by the recording signal processing section, the signal reproduced by the second reproduction head is processed by the first reproduction signal processing section, and an output is obtained; During advance playback editing, the signal played back by the first playback head is processed by the first playback signal processing section to obtain an output, and after mixing or switching the output signal with the input signal, the recording signal processing section 2. The signal recording and reproducing apparatus according to claim 1, wherein the signal is processed by the recording head and recorded by the recording head. (3) During normal recording, while the recording head records the signal processed by the recording signal processing section, the signal reproduced by the second playback head is processed by the second playback signal processing section, and an output is obtained; During advance playback editing, the signal played back by the first playback head is processed by the first playback signal processing section to obtain an output, and after mixing or switching the output signal with the input signal, the signal is processed by the recording signal processing section. 2. The signal recording and reproducing apparatus according to claim 1, wherein an output is obtained by processing a signal that is processed, recorded by the recording head, and reproduced by the second reproduction head by the second reproduction signal processing section. Device.