JPS60177474A - Tape recorder device - Google Patents

Abstract

PURPOSE:To access a desired position of information, which is recorded on a tape, in a high speed by recording one index information on several frames to shorten the frame length and recording repeatedly all index information. CONSTITUTION:In case the first information unit is switched to the next unit after recording of the first information unit is terminated, the information unit number is incremented when a number button 18 is depressed. Each information unit number and the time code of the start position are stored in order in an index information recording device 13. At a recording time, index information are not recorded simultaneously because the total number of information units recorded on the tape and the time code of each information unit are not known. Consequently, an index button 19 is depressed when recording of all information units is completed, and index information in the device 13 are distributed to individual frames and are recorded repeatedly.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape recorder device that records audio information, image cleaning, etc. in the form of an analog signal or digital signal, and particularly relates to a tape recorder device that records audio information, image cleaning, etc. It concerns a method of recording.

[Prior art]

In order to quickly locate an arbitrary position of audio information or picture information recorded on a tape (hereinafter referred to as "cue cue"), in addition to the original information, it is necessary to identify where the information is located on the tape. There is a tape recorder that records subcodes such as address information indicating the address information.

For example, a consumer digital audio processor converts a digital signal with a frame structure as shown in FIG.
Record to tape via R and -C.

Figure 1 (→ is a 128-bit data block, A
is 14×6=84 bits of sampled signal word length, B
is a 28-bit tilt correction word sound part, and C is a 16-bit error detection word part.

FIG. 1(b) shows a 128-bit control signal block, where D is a 56-bit cue signal part, E is a 14-bit content identification code part, F is a 28-bit address part,
H is a 14-bit control part, and H is a 16-bit false detection word part.

As shown in Figure 1, there are data blocks that record the original music signal data and subcodes. A time code representing hour 1 minute 1 second is recorded in the address portion F of the control signal block to be recorded. Therefore, in order to cue up a desired position, it is sufficient to specify the Quim code. Normally, you cannot immediately know the time code of the desired position unless it is recorded on something else, so you have to manually search for the desired position at high speed. Therefore, an area for recording the time code, etc. at a desired position on the tape, that is, an index recording area, is set up somewhere on the tape, and when playing back, the index information is read in first, and when cuing up to the desired position. It is easy to think that it would be faster to perform the processing based on the index information.

There are two ways to record index information: one is to concentrate recording on a specific area such as the beginning or end of the tape, and the other is to record repeatedly from the beginning to the end of the tape.An example of the former method is As a compact disc, an index information recording area is provided before the music signal recording area.

The former method is effective for disks that allow random access, but for tapes that must be accessed sequentially, it is necessary to perform fast rewind or fast forward once to the index information recording area. This has the disadvantage that it takes time to load the information. On the other hand, according to the latter method, the index information is repeatedly recorded no matter what position on the tape the tape is played back from, so the reading time is shortened and the cueing to the desired position becomes faster. Considering the frame structure of the subcode area in which index information is repeatedly recorded, the second
It will look like the figure.

In Figure 2, J is the index area part, K is the synchronization signal part, L is the information unit number part, M is the time code (hours 9 minutes 9 seconds) part, N is the nth information unit number part, and P is the nth information unit number part. The first time code of the information unit (hour 9
minute 9 seconds) part, and the Q-key error detection word part.

If the configuration shown in Figure 2 is adopted, the index area J within one frame will be large, resulting in a longer frame length, and the frame length will also increase depending on the number of information units recorded per tape roll. It will change. If the total frame length is increased, the recording density must be increased to record on the tape, making it difficult to read the tape at high speed, and if the frame length is changed, the loop circuit becomes complicated. In a multi-track tape recorder such as a professional POM recorder, the above problems can be avoided by providing one track exclusively for recording index information, but using a dedicated track itself is not efficient. That's a lot.

[Summary of the invention]

The present invention is a new tape recorder device that records sub-codes that also include index information with a frame structure that emphasizes the advantages brought about by the method of repeatedly recording index information and eliminates the above-mentioned disadvantages. is intended to provide.

(Embodiment of the Invention) In an apparatus according to an embodiment of the present invention, a subcode is recorded in a frame structure as shown in Fig. 3. In Fig. 3, R
is the 8-bit synchronization signal part, S is the 8-bit information unit number part, and T is the 24-bit time code (hour 1 minute 9).
U is an 8-bit data content identification portion, ■ is an 8-bit data portion, and W is an 8-bit erroneous detection word portion. The synchronization signal is used to detect the beginning position of the frame, the information unit number indicates the consecutive number of information units recorded on the tape, the time code indicates the absolute time from the beginning of the tape, and the content identification of the data is as follows: The error detection code indicates the content of the next data, and is an error detection code for detecting bit errors within the 19-frame excluding the synchronization signal. A method for recording index information when the frame structure is as shown in FIG. 3 will be described below. The minimum required items for index information are the total number of information units recorded on the tape, and
This is the information unit number and the absolute time of its starting position.

The code corresponding to each item is the content identification part U of the data.
As shown in FIG. 4, five frames are required to record the index information for one information unit, as shown in FIG. 4.

Maximum number of information units that can be recorded per 11 volumes of Chi is 99
Then, 6×99=4957 frames are required to record index information for all information units.

If the transmission rate of the subcode is 3.21 cbps,
The number of frames per second is 3.2/64=50 frames, and K for reading index information during normal playback is 495,150-41o seconds. Because the transmission rate is low, subcodes can be demodulated easily even during speed searches when the tape is running at high speed.
The time to read index information can be further reduced. (At 10x speed, it will take about 1 second.) If entertainment is detected within the OL frame, part of the data will be missing, but since it is being recorded repeatedly, the missing data can be filled in immediately. I can do it.

FIG. 5 shows an embodiment of a tape recorder apparatus that records subcodes including index information in the frame structure described above. When playing the recorded team 1 (7) with the tape recorder shown in Fig. 5, press the operation panel (tap).
When the upper PLAY button Q6 is pressed, the device enters playback mode and transfers the signal recorded on the tape (7) to the playback head (
The output signal of the reading head (9) is amplified and equalized by the reproduction amplifier Ql) and sent to the subcode modulation/demodulation circuit (2).

In the subcode modulation/demodulation circuit Q2, the subcode is digitally demodulated, and the information unit number and time code are
It is sent to the display C1 (1) and displayed. The opened index information is stored in the index information storage device.Next, when newly recording on the tape (7),
When the REO button αη on the operation panel αθ is pressed, the apparatus enters the recording mode, and the number of the first information unit to be recorded is 11, and the time code at its leading position is 0:00:00:00. These subcode data are digitally modulated by a subcode modulation/demodulation circuit and sequentially recorded on a tape (7) by a recording head (8) driven by a recording amplifier QQ.

When the distribution of the first information unit is finished and the next time changes to the i-report unit, if the No button (to) on the operation panel ae is pressed, the information unit number is incremented. Each information unit number and the time code of its leading position are sequentially stored in the index information storage devices γf and QS'. At the time of recording, the total number of information units recorded on the tape and the time code of the beginning position of each information unit are not known, so index information is not recorded at the same time. Therefore, when the recording of all information units is completed, if you press the NDKX button α9 on the operation panel αθ, the tape is rewound and returned to the recording start position, and the index stored in the index information storage device 03 is Information is distributed to each frame in the format shown in FIG. 4, and index information is repeatedly placed.

In order to record index information, as mentioned above, you have to go through the recording mode twice, but if you know the index information before recording, you can use some method to index the index information. It is sufficient to store it in the information storage device 0 and simultaneously distribute it for the first time. Therefore, if the software manufacturer uses pre-recorded
Effective when making tape (pre-recorded tape).

In the apparatus described above, the total number of information units, the information unit (It) number, and the absolute time of the leading position are considered as the index information, but the title of the information unit can also be easily additionally recorded. In other words, a code that specifies that the next data is a character code can be set in the content identification code part U of the data.If you do this, one frame will be used for alphanumeric characters, and two frames will be used for kanji. A frame is required. A keyboard or the like may be used to input the character code.

〔Effect of the invention〕

As described above, according to the present invention, the index information of one information unit is recorded across 7 subcode frames to shorten the frame length, and all the index information is repeatedly recorded. , the desired location of information recorded on the tape can be accessed at high speed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the frame formation of a digital audio processor, FIG. 2 is a diagram showing the frame formation of a subcode including the index range, and FIG. 3 is a diagram showing the subcode recorded by the apparatus according to the present invention. FIG. 4 is a diagram showing an example of frame composition shown in FIG. 3, and a diagram showing a method of recording index information. FIG. 5 is a block diagram showing an embodiment of the present invention. be. In the figure, (7) is a magnetic tape, (8) is a recording head, (9) is a playback head, 2 is a recording amplifier, 01 is a playback amplifier, Q2 is a subcode modulation/demodulation circuit, a3 is an index information storage device, and a< is a display, and αG is an operation panel. Idanjin Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A tape recorder device that records information on a magnetic tape and reproduces the information from the magnetic tape,
A subcode modulation/demodulation circuit that digitally modulates and demodulates subcode information including index information corresponding to information to be recorded; an index information storage device that stores the index information; and a display device that displays the contents of the subcode information. A tape recorder device characterized by being equipped with a display. (2) A frame in which subcode information is recorded includes a synchronization signal part that detects the preceding position of the frame, an information unit number part that indicates the consecutive number of the w-knit part of the information to be recorded on the magnetic tape, and a tape recording Information excluding a time code part that indicates the absolute time elapsed from the start, a part that records arbitrary data, a part that records a code that identifies the content of the data, and the synchronization signal recorded within the frame. It consists of a part that records a code for detecting errors in index information, and the data content identification code is assigned to each item for items necessary for index information.
Following the data content identification code, the item data of the index information is recorded, the index information corresponding to one information unit is composed of multiple frames, and all information units recorded on the tape are 1. A tape recorder device according to claim 1, characterized in that index information is repeatedly recorded from a recording start portion to a recording end portion of the tape. (3) When playing back a tape on which information has been recorded, the index information recorded in the subcode is read and stored in the index information storage device fFK.On the other hand, when recording new information, the The unit number and the index information of the time code at the time when the information unit changes are temporarily stored in the index information storage device, and after the information recording is completed, the index information is stored in the index information storage device from the recording start position on the tape. 2. The tape recorder apparatus according to claim 1, wherein the index information is read out, the index information is included in the subcode signal, and the tape recorder is rewritten to the end position of the tape.