JPH0349156B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiplex recording device that can accurately and quickly search for a desired position on a recording medium such as a magnetic tape.

Tape recorders have been widely used for recording voice, music, or data. There are two types of tape recorders, cassette type and reel-to-reel type, depending on the purpose, but either type has a counter that displays the number of rotations of the tape and a display of the running time of the tape as a means of knowing the tape position during recording or playback. A time indicator is provided. However, in the tape position search method using a time indicator as a counter, it is difficult to accurately detect the position due to elongation and slippage of the tape.

Therefore, when it is necessary to search the tape position extremely accurately, such as when overdubbing or searching for the beginning of a tape at a broadcast station, it is necessary to send a pulse signal with a regular cycle (for example, every minute) to one channel of the tape.
200 beats, the frequency is 320 Hz), and by counting this pulse signal, you can search for the tape position, or you can search for the elapsed time from the start of recording music or data to a specific channel at predetermined intervals. A recording method has been adopted. These methods allow much more accurate position detection than the above-mentioned tape position search using a counter or time indicator, but the former method, which uses pulse signals, has limitations on the recording and playback frequencies of the tape and head. (approximately 20KHz), there is a limit to the maximum frequency of the pulse signal, and there is a possibility of misreading of the pulse signal due to slack in the tape when the tape starts or stops running, making it difficult to detect the tape position with high precision. There is a problem.

Taking music multiplex recording as an example, before recording music, first a synchronizing clock signal and a click sound signal are recorded on each channel at both ends, and then the clock signal and click sound signal are recorded on each channel at both ends. Based on this, for example, a rhythm sound source (drums, bass, etc.) is recorded on another channel.
Next, record to each track sequentially, such as recording from an ensemble sound source (brass, string, etc.) on another channel, but if you want to record from a certain position in the middle, you can search for that position. Find out the time from the beginning to that position in advance, then use a stopwatch or the clock signal already recorded on channel 1 to fast-forward the tape until it is close to the desired position, and then start the tape when it approaches that position. The method used is to set the speed at a constant speed and search for the desired position while monitoring with a headphone. This operation is extremely troublesome and takes time to search for the desired position. Furthermore, since one bar of music does not always have the same length of time, it is not always possible to accurately detect a position using time data. When recording music from different sound sources on multiple channels while repeating such operations, these problems can be overcome by using a method that uses prerecorded time data to search for the tape position.

Also, when recording music created using a music sequencer or a computer in synchronization with music that has already been recorded on tape, it is easy to synchronize from the beginning by using the clock signal recorded on the tape. It is difficult to accurately synchronize and record from the middle of the process, as in the case of multiple recording described above. Conversely, in the same sense, it has been impossible to control external music production equipment from a tape recorder.

The present invention has been made in view of the above points, and focuses on the fact that music information includes information representing several timings such as measures and beat numbers (hereinafter referred to as "music timing information"). In order to enable accurate position detection, music timing information is recorded on a recording medium such as a magnetic tape.

The present invention will be explained below based on the drawings.

FIG. 1 is a block diagram of an embodiment of a multiplex recording device according to the present invention using a magnetic tape as a recording medium, in which 1 is a controller composed of a CPU 1a and a memory 1b, 2 is a music beat (for example, 4
A control panel 3 has a keyboard 2a for setting the tape position (4/4 time signature) and a desired tape position, and a display 2b for displaying music data such as measure numbers; A multi-channel recorder including a recording head for recording such timing information together with voice, music, data, etc. and a playback head for reproducing them; 4 is a modulator that modulates the timing information from the controller 1 using, for example, FSK (frequency displacement method); , 5 is a demodulator that demodulates the music timing information reproduced by the recorder 3, 6 is a low-pass filter, 7
8 is an external sound source such as a music sequencer or an electronic musical instrument, and 8 is an audio output device such as a mixer, effector, or speaker. Note that 9 is an output device for music, video, etc. that operates in synchronization with the music recorded by this multiplex recording device.

Now, when multiplex recording music using the multiplex recording device according to the present invention, various types of music timing information can be considered to be recorded on the tape in advance in order to search the tape position. Although almost all music data can be expressed as unit time information, we will explain this using measure information as an example, which is considered to be the easiest and most useful.

"Measure information" is data A ₁ , A ₂ , ...A _o ... that indicates the starting position of each measure of music, as shown in Figure 2, and each measure data. As illustrated in Fig. 3, 8 is sandwiched between the start mark “1” and the end mark “1”.
It consists of a binary data block of bits, and FIG. 3 shows measure data A ₁ , A ₂ , and A ₃ representing the first measure, second measure, and third measure. The time width of the data block can be changed arbitrarily depending on the music to be recorded, but a space (no signal time) must be provided between two adjacent bars of data.

Measure data generation timing is controller 1
It is created by frequency-dividing the output of an oscillator installed inside the oscillator. That is, when a time signature (4/4 or 6/8) is set by operating the keyboard 2a, bar data is output from the controller 1 at a timing corresponding to the set time signature. As mentioned above, the measure data is 8-bit binary data, which is subjected to FSK displacement by the modulator 4 and recorded on the first track located at the end of the tape. In this case, the space must be at a lower frequency than the lower frequencies that make up the data block, in order to ensure that the data block can be detected. However, the method of modulating bar data is FSK
Other possibilities are also possible, in which case the temporal relationship between the data block and the space will be different.

FIG. 4 is a flowchart for recording measure data on tape according to the present invention.

First, the tape is rewound to the start position (top) (F-1), and the counter in the controller 1 is set to 0 (F-2). Next, the recorder 3 is set to recording mode and the tape is run at a constant speed (F-3).
While driving at a constant speed, read the measure data from the memory 1b of the controller 1 (F-4), and use the modulator 4 to read out the measure data from the memory 1b of the controller 1.
It is FSK modulated and recorded on tape T. This operation continues until an instruction to stop recording the measure data is received (F-5), and during this time the contents of the counter are counted up by one (F-6). The recording stop command is a recording stop command that is output when a number of bar data equal to the number of bars initially set on the keyboard 2a is recorded according to the number of bars of music to be recorded thereafter.

Next, bar search using bar data will be explained with reference to FIG.

First, input the number _Ns of the measure you want to cue from the keyboard 2a (P-1) and display 2b.
is displayed as music data. Next, the tape is run at high speed (P-2), the measure data recorded on the first track of the tape is played back by the playback head (P-3), and the low-pass filter 6 generates a pulse corresponding to the width of the data block. Create a signal and input it to controller 1. FIG. 6A shows the data block of the first measure, and FIG. 6B shows the pulse signal generated from this data block. The counter in controller 1 counts up this pulse signal,
At the same time, the bar numbers are sequentially displayed as music data on the display 2b. Its count value (N _t )
When it reaches a predetermined number A (for example, 4) less than the number _Ns of the measure you want to cue entered from the keyboard 2a (P-4), the speed of the tape is set to a predetermined speed that can be read as data (P-4). -5).
After that, the contents of the measure data played by the playback head are decoded (P-6), and it is determined whether the contents are equal to the measure number to be searched (P-7).
When they are equal, the tape is stopped (P-8). Deciphering the contents of the data block after the tape has run at a predetermined speed is dangerous due to the start conditions of high-speed running, reading errors during high-speed running, etc., and it is dangerous to judge the bar number only from the number of bar data. It is from. The position where the tape stops in this manner is the desired bar position.

In the above embodiment, the case where measure information is recorded as one of the music timing information was exemplified, but the present invention is not limited to this, and the present invention is not limited to this. Of course, information etc. may also be recorded. In addition to being generated within the recording apparatus, the timing information to be recorded on the tape may of course be provided from an external video or audio output device. Furthermore, the timing information may be recorded in a form other than a digital signal. Furthermore, it goes without saying that the present invention can also be applied to multiplex recording using disks and other recording media other than tapes.

As explained above, in the present invention, music timing information such as measure information is recorded in advance on a recording medium, and a desired position on the recording medium is searched by reproducing this music timing information. The desired position of the medium can be detected accurately and quickly, making it extremely convenient for multiplex recording. In addition, the music timing information recorded on the recording medium can be transferred to an externally connected music sequencer, electronic musical instrument, etc.
By sending it to automatic music players such as mixers and effectors, or external devices such as video equipment and computer graphics, it is possible to play other music or output images in synchronization with the music recorded on the recording medium. It becomes possible to enrich musicality and expand it into the realm of comprehensive art.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of a multiplex recording device according to the present invention, FIG. 2 is a diagram showing the timing relationship between measure data and musical notes used in the present invention, and FIG. 3 is an example of measure data. Fig. 4 is a flowchart of music timing information recording by the multiplex recording device of the present invention, Fig. 5 is a flowchart of measure search operation by the same device, and Fig. 6 is a timing diagram showing an example of reproduced measure data and its processed output. It's a chat. 1...controller, 2...control panel,
3... Recorder, 4... Modulator, 5... Demodulator, 6... Low pass filter, 7... External sound source, 8... Audio output device.

Claims (1)

[Scope of Claims] 1. A recording means for recording music timing information on a recording medium, a setting means for variably setting a recording cycle of the music timing information recorded by the recording means, and a recording means for variably setting the recording period of the music timing information recorded by the recording means, a search position specifying means for specifying a search position based on timing information; a reproducing means for reproducing music timing information recorded on a recording medium at a recording cycle set by the setting means; and a running position of the recording medium based on the reproduced music timing information. and a display means for displaying music data based on reproduced music timing information. Multi-recording device. 2. The multiplex recording device according to claim 1, wherein the music timing information is bar display information.