JPS6331863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and more specifically, the present invention relates to a magnetic recording and reproducing device, and more specifically, the present invention relates to a magnetic recording and reproducing device that records signals related to video, audio information, etc. A signal (hereinafter defined as a digital signal in this specification) obtained by recording on a recording medium with a non-recorded portion interposed therein, and digitally processing information related to the video and audio information on the non-recorded portion. The present invention relates to a magnetic recording/reproducing device that performs recording.

For example, in a prior art magnetic recording and reproducing device that uses magnetic tape as a recording medium, if the operator wishes to enjoy playing back and listening to only the music, or if the user wants to record a number of music, the recording capacity of the tape cassette may be insufficient. When the number of songs is small, song titles, composer names, song descriptions, and lyrics (hereinafter referred to as music-related information) are generally not recorded directly on magnetic tape.
The information is recorded by hand using a writing instrument on the cassette case, attached memo paper, etc.

However, with the method of recording in a cassette case, etc., (1) there is a risk of losing the memo paper, (2) it is troublesome to record using a writing instrument, and (3) the title of the music being played is There are problems such as it is inconvenient to know.

On the other hand, in order to arbitrarily locate the beginning of one music out of a number of music recorded on a magnetic tape, a non-recorded area ( A system that searches between songs (between songs) and controls tape running is very convenient for finding the beginning of music.

However, even with this method, there is a problem that malfunctions cannot be avoided when the music to be recorded and played back has a wide dynamic range, such as an orchestra.

The present invention has been made in order to solve the above-mentioned problems, and it records and reproduces digital signals such as character information on the same recording track as analog signals, and also records and reproduces digital signals such as character information on the same recording track as analog signals, and furthermore, A magnetic recording and reproducing device records a recognition signal indicating a character string position on a recorded recording track, and searches for the recognition signal during playback, thereby making it possible to more quickly and accurately search the recording position of information related to an analog signal. The purpose is to provide.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit configuration block diagram showing an embodiment of the part of the present invention for creating, displaying, and recording character string data, etc., and recording a character string recording position recognition signal, and FIG. 2 is a circuit configuration block diagram showing the construction of FIG. , a diagram showing an embodiment of a magnetic tape recorded by a recording circuit; FIG. 3 is an embodiment of a portion that reproduces and displays the magnetic tape of FIG. 2, and further searches and reproduces a character string recording position. FIG. 3 is a circuit configuration block diagram showing the circuit configuration. or,
Figure 4 shows the operation sequence of the microprocessor (CPU) in the circuit shown in Figure 1, and Figure 5 shows the operation sequence of the microprocessor (CPU) in the circuit shown in Figure 1.
3 is a flowchart showing the operation sequence of the circuit shown in the figure.

In FIG. 1, the character string creation and recording circuit includes a microprocessor 1 (hereinafter abbreviated as CPU 1), an operating keyboard 2, a dot matrix display, and a refresh memory 3 for display characters.
(hereinafter abbreviated as RAM 3 or display 3), character string data digital modulation circuit 4, low frequency oscillation circuit 5
(hereinafter abbreviated as OSC 5), a recording signal switching circuit 6, a recording amplifier 7, a recording head 8, a recording tape 9, and a tape running mechanism controller 10 (hereinafter abbreviated as mechanical controller 10).

Note that the CPU 1 includes a program counter 101, a program ROM 102, an instruction decoder 103, an arithmetic unit 104, an accumulator 105, latches 106, 107, 108 for external interfaces, and a receiver 11, as shown in FIG.
0, 111, and an address data register 113, program instructions sequentially specified by the program counter 101 and output from the ROM 102 are decoded by the instruction decoder 103, and are processed via the accumulator 105 for calculation and processing to be described later. Input from the keyboard 2 is input via the receiver 110, tape running is controlled via the latch 108, digital data is output to the modulation circuit 4 via the latch 106, and recording signal is switched via the latch 107. Furthermore, display character string data is input/output via the address data register 113.

Hereinafter, the operation of the circuit shown in FIG. 1 will be explained according to the operation flowchart shown in FIG. First, at position _P1 , the CPU 1 is waiting for input from the keyboard 2. The keyboard 2 consists of a character input key a, a character string recording command key b, and a tape running control key c. When creating a character string, inputting the character key a determines the position of P ₂ and reaches P ₃ ,
A character code is input from the keyboard 2 to the CPU 1 via the data bus A. CPU1 reads the character code and transfers it to RAM3. The RAM 3 is a buffer memory for display characters, and is configured so that the contents of this memory are displayed on a dot matrix display.

Therefore, when the character key a is input, the input character code is stored in the RAM 3, and the contents are displayed on the display 3 again as characters.

Once a character string has been input and created using the character key a in this manner, the character string recording command key b is then input. When the key is determined in P ₄ , P ₅
is reached, and the recording signal first passes through the control line G.
Switch to signal F from OSC5. Here OSC5
is a low frequency signal oscillation circuit, which oscillates at, for example, an inaudible low frequency of about 5 Hz.

Therefore, the low frequency signal from the OSC 5 is outputted to the output H of the switching circuit 6. This signal is a recognition signal indicating the recording position of character string data, and will be used later as a search signal during reproduction. When the recording signal is set in the switching circuit, it reaches _P6 , and the CPU 1 commands the mechanical controller 10 to run the tape via the control line J, and the mechanical controller 10 performs a series of controls related to the recording run via the K. Begins. Once tape running begins, recording continues for T seconds long enough for _P7 to be reached and a recognition signal to be detected during playback. When the recording of the character string recording position recognition signal is completed, _P8 is reached, and the CPU 1 switches the recording signal to the character string data output from the modulation circuit 4 via D via the control line G by the switching circuit 6. next
When _P9 is reached, recording of character string data begins.
The character string data is recorded by reading the character string created and stored by repeating P ₁ to _{P 3} from the RAM 3 and transferring it to the modulation circuit 4. The modulation circuit 4 converts the parallel character data transferred from the CPU 1 via the data bus C into serial data, performs digital modulation so that it can be recorded on a magnetic tape, and also converts harmonic components due to the square wave of the digital signal. is also removed, and a code for a cycle that can be read during playback is added and output to the switching circuit 6 (as the digital signal modulation method is an existing technology, the explanation will be omitted.) Therefore, P ₉ This is repeated until the transfer of the character string created by P10 and _P10 is completed, and is output from the modulation circuit 4 to the switching circuit 6 via the continuous character string data D. In the switching circuit 6, the input is D at the time of _P8 .
The output of the modulation circuit 4 becomes the output of the switching circuit 6, which is amplified by the recording amplifier 7 to a current sufficient to record on the magnetic tape, and is recorded on the magnetic tape 9 via the recording head 8. .

When the output of the string data is finished, CPU1
When _P11 is reached, the recording run of the tape is stopped via the mechanical controller 10, and at _P12 , the recording signal is switched to the normal analog signal input E via the switching circuit 6.

On the other hand, when recording an analog signal, the input of the recording amplifier 7 is normally switched to the audio signal side by the switching circuit 6, so the drive control key c of the keyboard 2 is used to record the analog signal.
As shown in _P13 to _P14 , this is carried out by controlling via the mechanical controller 10 in the same manner as in conventional electromagnetic mechanism tape decks.

In the manner described above, analog signals, character string data, and character string recording position recognition signals are recorded on the same track of the magnetic tape.

FIG. 2 is a diagram showing an example of a magnetic tape produced and recorded in this manner. In FIG. 2, music A indicates a character string recording position recognition signal, character string data, and music B. In this example, music A is first recorded using the tape running control key c, then a character string is created using the character key a, and is recorded using the character string recording key b, and then music B is recorded using the tape running control key c. Here is the case where it is done. Here, ~ are on the same track, and ~ and are conventionally used as unrecorded areas between songs.

Next, a case will be described in which a tape as shown in FIG. 2 is played back and searched. FIG. 3 1 shows the circuit that performs these operations.
2. Reproduction amplifier 13, speaker drive amplifier 1
4, speaker 15, digital data demodulation circuit 1
6. Microprocessor 17 (hereinafter abbreviated as CPU 17), dot matrix display and display character refresh memory 19 (hereinafter abbreviated as display 19 or RAM 19), tape running control command key 18 (hereinafter abbreviated as key 18), tape Traveling mechanical controller 20 (hereinafter referred to as mechanical controller 20), low pass filter 21 (hereinafter referred to as LPF 21)
), and an A/D converter 22. It is assumed that an acoustic signal, character string data, and recognition signal are recorded on the magnetic tape 11 as shown in FIG. 2 by the circuit shown in FIG.

As shown in FIG. 3, the CPU 17 includes a program counter 171, a program ROM 172, an instruction decoder 173, an arithmetic unit 174,
Accumulator 175 and latch 176 for external interface, receivers 177, 178, 1
79, address data register 180,
Program instructions output from the ROM 172 that are sequentially designated by the program counter 171 are decoded by the instruction decoder 173, and are processed through the accumulator 175 and processed as described below. In other words, input from the keyboard 2 is input through the receiver 177. The tape running is controlled via the latch 176, character string data from the demodulation circuit is input via the receiver 178, data is input/output from display characters via the address data register 180, and the recognition signal is controlled via the address data register 180. Detection input at the time of fast tape winding is processed via the receiver 179 according to the input program.

The operation will be explained below according to the reproduction operation flowchart shown in FIG. First, when the tape 11 is set and the performance key f among the keys 18 is input, the CPU
17 determines the key at P ₁₅ , passes P ₁₆ ,
After the determination at position _P18 , _P19 is reached, a tape running command is sent to the mechanical controller 20 via the control line R, and the mechanical controller 20 performs the instructed running control via the control line S.

When the tape starts running, the analog signal and character string data reproduced by the reproduction head 12 and the recording position recognition signal are each amplified by the reproduction amplifier 13, and then the analog signal is amplified by the amplifier 14.
The signal is further amplified and reproduced as sound by the speaker 15. On the other hand, the character string data signal is signal line M
The parallel character data is input to the demodulation circuit 16 via the data line Q, and before being digitally modulated, it is demodulated into the original parallel character data, that is, the same data as the data line C in FIG. 1, and is output to the CPU 17 via the data line Q. Ru. If there is no key input at _P15 , the CPU 17 reaches _P33 and determines whether or not there is demodulation input Q. If there is an input, it reaches _P34 , receives the modulated character code from the demodulation circuit 16 via the data line Q, and transfers it to the RAM 19. On the display 19, the contents of the RAM 19 are displayed as characters, similar to those shown in FIG. 1, and therefore a character string is reproduced.

In FIG. 3, the demodulation circuit 16 is an existing technology along with the modulation circuit 4 in FIG. 1, so the explanation thereof will be omitted. In addition, the other travel control keys are similar, the stop key d is in the order of P ₁₅ → P ₁₆ → P ₁₈ → P ₂₀ → P ₂₁ , the pause key h is in the order of P ₁₅ → P ₁₆ → P ₁₇ , and the rewind key e is
P ₁₅ →P ₁₆ →P ₁₈ →P ₂₀ →P ₂₂ →P ₂₃ →P ₂₄ , and the fast forward key g is P ₁₅ →P ₁₆ →P ₁₈ →P ₂₀ →P ₂₂ →
They are determined in the order of P ₂₃ →P ₂₅ →P ₂₆ and controlled via the mechanical controller 20.

Next, a search operation based on recognition signal detection will be explained.

Regarding the search operation, it is assumed that the search operation is performed when the performance key f is input and the rewind key e or the fast forward key g is input during the performance. If, for example, the rewind key e is input during a performance, the CPU 17 reaches P ₁₅ →P ₁₆ →P ₁₈ →P ₂₀ →P ₂₂ , and since the performance is in progress, it reaches P ₂₇ . Then, key e is determined, and rewind travel control is performed in _P28 . Unlike the normal rewinding on page ₂₄ , the rewinding is performed by the CPU so that the rewinding is performed while the playback head 12 remains in contact with the tape.
It is assumed that the traveling mechanism, head position control, etc. are performed by the mechanical controller 20 via the control line R from 17.

When rewinding starts, the tape is normally fed at a speed of about 20 to 30 times the playing speed, so the frequency of the playback signal is also multiplied by the same, so the playback of the character string recording position recognition signal is also, for example, 5Hz. If it were recorded,
Plays at 100-150Hz. The recognition signal reproduced at this frequency is amplified by the reproduction amplifier 13 and then input to the LPF 21 via the signal line M. LPF2
1 is designed with a cutoff frequency of, for example, about 150 Hz so that a recognition signal can be detected, and generates a signal on the signal line T when a recognition signal is input.

This signal is converted to A/D by the A/D converter 22.
After D conversion, the CPU 17
is supplied as a recognition signal to For analog signals, 400Hz at 20-30x tape speeds
Therefore, it is not a recognition signal. Therefore,
The CPU 17 continues the rewinding operation until the recognition signal is input from the signal line U at P _31. When the tape position reaches the position of the recognition signal in FIG. 2, for example, the LPF 21 outputs the
Since it is input as a recognition signal via the converter 22, it reaches P ₃₂ and is sent to the mechanical controller 2 via the control line R.
Issues a command to play the tape to 0 and performs the operation.

Since character string data is recorded on the magnetic tape in succession to the recognition signal by the circuit shown in Figure 1, the character string data will be played back by moving to tape playback after being detected by the recognition signal. .

FIG. 6 is a diagram showing an example of a magnetic tape that uses recognition signals to locate the beginning of a song. FIG. 1 shows a conventional magnetic tape music recording format, and FIG. shows the format in which character strings are recorded. The diagonally shaded portions of the song intervals A, B, C, and D indicate recognition signals, and the black portions indicate recorded portions of character string data signals. In this way, since the recognition signal is recorded between each song, no matter what the content of the music signal is, as long as it does not overlap with the frequency band of the recognition signal, it is possible to accurately locate the beginning of the song and immediately after the music signal as described above. Character strings can be played back and displayed.

In the manner described above, a character string attached to an analog signal can be created, recorded, played back and displayed, and the character string recording position can be searched.

As described above, the present invention records a recognition signal as a search signal and then records a digital signal such as character information.
By sequentially recording analog signals such as video and audio information, and checking using recognition signals when the recording medium is driven at high speed, the recorded audio information can be dynamically cleaned like an orchestra performance. It is possible to search for any location quickly and accurately even in a wide area, and information related to the video or audio information to be played, such as textual information such as song title and composer, can be searched before playback. It is possible to visually display and then determine in advance the content of video, audio information, etc. that will be played back, which is extremely effective in practice, and it is also possible to record any information related to video, audio information, etc. possible and more effective.

It should be noted that the above description is only one embodiment of the present invention, and it goes without saying that the present invention can be implemented in various ways within the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an internal system on the recording side of a magnetic recording/reproducing apparatus according to an embodiment of the present invention.
2 is a block diagram of the internal circuit of the CPU of the above device, FIG. 3 1 is a circuit block diagram of the internal system on the playback side of the device, and FIG.
The internal circuit block diagram of the CPU, FIG. 4 is a flowchart explaining the operating procedure of the device in FIG. 1, FIG. 5 is a flowchart explaining the operating procedure of the device in FIG. 3, and FIGS. 2 and 6. 1 is a diagram showing an embodiment of a magnetic tape on which signals are recorded by the apparatus of the present invention; FIG. 1, 17...Microprocessor, 2, 18...
...keyboard, 3,19...dot matrix display and refresh memory for display characters,
4... Character string data digital modulation circuit, 5... Low frequency oscillator, 6... Recording signal switching circuit, 7... Recording amplifier, 8... Recording head, 9, 11... Magnetic tape, 10, 20... Tape running mechanical controller, 12... Playback head, 13... Playback amplifier, 14... Power amplifier, 15... Speaker,
16...Character string data demodulation circuit, 21...Low pass filter, 22...A/D converter, a...
...Character string input key, b...Character string recording command key,
c...Tape running control key, d...Tape running stop key, e...Rewind key, f...Performance key, g
...Fast forward key, h...Tape play pause key.

Claims (1)

[Scope of Claims] 1. A magnetic recording and reproducing device that records analog signals related to video, audio information, etc. on a recording medium and reproduces the analog signals recorded on the recording medium, comprising: a character string signal generating means; a first recording device that digitally modulates the character string signal created by the creation device and records the digital signal on the recording medium; and a second recording device that records a recognition signal indicating the recording position of the digital signal on the recording medium. recording means for recording a recognition signal by the second recording means prior to the recording of the digital signal by the first recording means, and switching to a recording standby state for the analog signal after recording the digital signal; a switching means; a reproduction display means for reproducing and displaying the digital signal of the recording medium; a detection means for detecting a recognition signal on the recording medium when the recording medium is driven at high speed; and a recognition signal detected by the detection means. A magnetic recording and reproducing apparatus comprising: a control means for controlling driving of the recording medium, and after the recognition signal is detected by the detection means, the magnetic recording and reproducing apparatus sequentially reproduces the digital signal and analog signal following the recognition signal.