JP6902276B2 - Record board dubbing method and device and record board dubbing data playback method and device - Google Patents

Description

The present invention relates to a method and an apparatus for dubbing sound information recorded on a vinyl record and recording it as digital data, and a method and an apparatus for reproducing the recorded digital data.

At present, it is common to record sound information such as music as digital data and reproduce it using a digital player or the like.
On the other hand, there are also old sound sources recorded on vinyl records. However, devices such as record players that can reproduce sound information recorded on vinyl records are becoming less common.
Therefore, in order to enable the sound information recorded on the record board to be reproduced by using a digital player, it is required to dubb and record it as digital data.
As a general method for that purpose, a normal record player is used to convert sound information recorded on a vinyl record into an analog signal, and the converted analog signal is sampled and converted into digital data. There is.

Japanese Patent No. 67414

In the above method, the record needle cannot be faithfully moved to the groove of the record board due to the inertia of the arm or the like, and the sound quality may deteriorate.
An object of the present invention is to solve such a problem and to dubb the sound information recorded on a vinyl record and record it as digital data without deteriorating the sound quality.

Place the record on a turntable and rotate it at a slower rotation speed than the default. The record needle is brought into contact with the groove of the rotating record board by a pickup or the like, and the sound information recorded in the groove is converted into an analog signal. The analog signal is sampled by an analog-to-digital converter or the like and converted into digital data. The digital data is stored in a storage medium by a storage unit or the like.
The digital data stored in the storage medium may be reproduced at a reproduction speed faster than the default. The ratio of the reproduction speed to the predetermined reproduction speed may be substantially equal to the ratio of the predetermined rotation speed to the rotation speed of the record board.
The digital data stored in the storage medium may be acquired by an acquisition unit or the like. The acquired digital data may be converted into an analog signal by a digital-to-analog conversion unit or the like, assuming that the sampling frequency is higher than the default. The ratio of the sampling frequency to the predetermined sampling frequency may be substantially equal to the ratio of the predetermined rotation speed to the rotation speed of the vinyl record.
When sampling the analog signal, it may be sampled at a sampling frequency lower than the default. The ratio of the sampling frequency to the predetermined sampling frequency may be substantially equal to the ratio of the rotation speed of the record to the predetermined rotation speed.

Since the record is rotated at a slower speed than the default, the record needle can move faithfully to the groove of the record. Therefore, it is possible to prevent the sound quality from deteriorating.
When the stored digital data is played back by the amount of slow rotation of the record board, it can be played back at a normal speed if it is played back at a high speed.
Further, if the sampling frequency at the time of sampling the analog signal is lowered by the amount of the slow rotation of the record board, the stored digital data does not need to be played back at high speed, and can be played back normally.

The block diagram which shows an example of a dubbing apparatus. The block diagram which shows an example of the reproduction apparatus.

The dubbing device 10 (record board dubbing device) shown in FIG. 1 includes a turntable 11, a motor 12, an arm 13, a pickup 14, an A / D conversion unit 15 (analog-digital conversion unit), and a storage unit 16. , And a control unit 19.
The turntable 11 is for mounting a record board.
The motor 12 rotates the turntable 11.
The arm 13 moves the pickup 14 along the groove of the record board placed on the turntable 11.
The pickup 14 brings the record needle 30 into contact with the groove of the record board placed on the turntable 11, reads the depth of the groove, acquires the sound information recorded in the groove, and converts it into an analog signal. ..
Up to this point, it is the same as a normal record player.

The A / D conversion unit 15 samples the analog signal converted by the pickup 14 and converts it into digital data. The format of the digital data may be in accordance with an existing standard such as MP3, or may be a unique format.
The storage unit 16 stores the digital data converted by the A / D conversion unit 15 in the storage medium 40. The storage medium 40 may be any as long as it can store digital data, and may be, for example, an SD memory, a USB memory, a CD, a DVD, a hard disk, a cloud storage, or the like.

The control unit 19 controls the operation of the entire dubbing device 10.
The control unit 19 controls the motor 12 to rotate the turntable 11 at a speed slower than a predetermined rotation speed. For example, an LP record has a default rotation speed of 33 and 1/3 revolutions per minute. This is rotated at 16 and 2/3 revolutions per minute, for example. In addition, the single record board has a default rotation speed of 45 rotations per minute. This is rotated at, for example, 22.5 revolutions per minute. The rotation speed at which the motor 12 rotates the turntable 11 is not limited to half the predetermined speed, and may be slower. The slower the rotation speed, the longer the dubbing time, but the better the sound quality.

The reproduction device 50 (record board dubbing data reproduction device) shown in FIG. 2 includes an acquisition unit 51, a D / A conversion unit 52 (digital-to-analog conversion unit), and a speaker 53.
The acquisition unit 51 acquires the digital data stored in the dubbing device 10 from the storage medium 40.
The D / A conversion unit 52 converts the digital data acquired by the acquisition unit 51 into an analog signal.
The speaker 53 converts the analog signal converted by the D / A conversion unit 52 into sound waves.

The reproduction device 50 reproduces the digital data stored in the storage medium 40 at a reproduction speed faster than the default. For example, in the dubbing device 10, if the digital data is recorded by rotating the turntable 11 at half the predetermined speed, the digital data is fast-forwarded and reproduced at twice the speed. Then, the sound recorded on the original record can be faithfully reproduced.
Specifically, for example, the D / A conversion unit 52 converts the digital data acquired by the acquisition unit 51 into an analog signal as if it was sampled at a sampling frequency higher than the default. For example, digital data created by the MP3 standard having a sampling frequency of 32 kHz is converted into an analog signal assuming that the sampling frequency is 64 kHz.
If the rotation speed of the turntable 11 is slower, the reproduction speed may be increased accordingly. Assuming that the default rotation speed of the vinyl record is ω ₀ , the rotation speed of the turntable 11 is ω, the default sampling frequency of the digital data is f ₀ , and the sampling frequency assumed by the D / A converter 52 is f, ω ₀ / By setting ω = f / f ₀ , the sound recorded on the original record can be faithfully reproduced.

The dubbing device 10 may be configured as follows in order to eliminate the need for fast rotation during reproduction.
That is, the control unit 19 controls the A / D conversion unit 15 to sample at a sampling frequency slower than the default. For example, when the turntable 11 is rotated at half the default speed, the A / D converter 15 also samples at half the default sampling frequency. For example, after sampling at a sampling frequency of 16 kHz, it is recorded in the digital data to be created that the sampling frequency is 32 kHz. As a result, if the created digital data is played back normally on a normal digital player, the sound recorded on the original vinyl record can be faithfully reproduced.
If the rotation speed of the turntable 11 is slower, the sampling frequency may be lowered accordingly. Assuming that the default rotation speed of the record board is ω ₀ , the rotation speed of the turntable 11 is ω, the default sampling frequency of the digital data is f ₀ , and the actual sampling frequency sampled by the A / D converter 15 is f, ω. _It may be set so that 0 / ω = f _{0 / f.}

The embodiments described above are examples for facilitating the understanding of the present invention. The present invention is not limited thereto, and includes various modifications, modifications, additions, or removals without departing from the scope defined by the appended claims. This can be easily understood by those skilled in the art from the above description.

10 dubbing device, 11 turntable, 12 motor, 13 arm, 14 pickup, 15 A / D converter, 16 storage unit, 19 control unit, 30 record needle, 40 storage medium, 50 playback device, 51 acquisition unit, 52 D / A converter, 53 speakers.

Claims (2)

Rotate the vinyl record at a slower speed than the default
The record needle is brought into contact with the groove of the rotating record board, and the sound information recorded in the groove is converted into an analog signal.
The analog signal is sampled at a lower sampling frequency than the default and converted into digital data.
The digital data is stored in a storage medium and stored .
The ratio of the sampling frequency to the predetermined sampling frequency is substantially equal to the ratio of the rotation speed of the record to the predetermined rotation speed.
Thus, when reproducing the digital data to which the storage medium has stored in the default rate, Ru can play a sound that has been recorded on the record board at a predetermined speed,
Record dubbing method. A turntable that rotates the vinyl record at a slower rotation speed than the default,
When the turntable is rotating the record board, a pickup that brings the record needle into contact with the groove of the record board and converts the sound information recorded in the groove into an analog signal.
An analog-to-digital converter that samples the analog signal converted by the pickup at a sampling frequency lower than the default and converts it into digital data.
A storage unit for storing the digital data converted by the analog-digital conversion unit in a storage medium is provided .
The ratio of the sampling frequency to the predetermined sampling frequency is substantially equal to the ratio of the rotation speed of the record to the predetermined rotation speed.
Thus, when reproducing the digital signal, wherein the storage medium is stored in the default rate, Ru can play a sound that has been recorded on the record board at a predetermined speed,
Record board dubbing device.

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