JP4372207B1 - Wax tube reader - Google Patents

Abstract

Provided is a wax tube reading device capable of accurately reading audio data even with respect to a wax tube manufactured in a deformed manner or deformed.
In a wax tube reader for reading voice data in a non-contact manner from a cylindrical wax tube in which a sound groove representing voice data is formed, a holding unit that holds the wax tube and rotates it around an axial center direction. And an imaging unit 12 that images the surface of the wax tube from the radial direction, and a calculation unit 22 that calculates sound data of the sound groove from the captured image data. The holding unit 11 includes the surface of the wax tube and the imaging unit 12. The wax tube is configured to be movable in the radial direction in order to maintain a constant distance between the first and second.
[Selection] Figure 1

Description

  The present invention relates to a wax tube reader for reading voice data in a non-contact manner from a cylindrical wax tube having sound grooves representing voice data formed on the surface thereof.

  A wax tube is a recording medium that is made of wax and has been used since the second half of the 19th century. As shown in FIG. 5 (a), the sound groove Y recorded voice information (voice data) converted into vibration in the depth direction, that is, the radial unevenness height and unevenness pitch (interval). It is formed in a spiral shape as a continuous groove on the surface of the wax tube X.

  Specifically, the wax tube X is a recording (engraved) of the vibration of the sound collected by the horn by the vibration (vertical movement) of the needle (recording needle). It corresponds to the waveform. In the sound waveform, since the frequency indicates the pitch and the amplitude indicates the volume of the sound, in the wax tube X, each pitch of the unevenness of the sound groove Y corresponds to the frequency (sound pitch). Corresponds to the amplitude (volume of sound).

  As an example of the wax tube X, the outer diameter is 55 mm, the interval between the sound grooves Y (interval in the center in the width direction) is 0.25 mm, the depth of the sound groove Y is 0.05 mm at maximum, and the total number of sound grooves is There are 400 lines that record about 2 minutes of audio.

  By the way, as a device for reproducing sound from the wax tube X, a wax tube reproduction device having a needle (reproduction needle) whose tip is in sliding contact with the sound groove Y is conventionally known. However, since the wax pipe regeneration device using such a needle wears and degrades the sound groove Y of the wax pipe X, the wax pipe X, which is a cultural property, is not preferable from the viewpoint of preserving valuable materials.

  Therefore, in recent years, a wax tube reader that reads the sound groove Y using a laser has been developed. Since the wax tube reader using such a laser can read voice data in a non-contact manner with respect to the wax tube X, the wax tube X can be prevented from being worn out and deteriorated.

  However, since the wax tube X is made of wax, distortion may already occur at the time of manufacture, or the wax tube X may be deformed due to deterioration over time. For example, as shown in FIG. 5B, the wax tube X has a radial cross section that is flattened (a middle portion Z1 in the axial direction rises), or as shown in FIG. A part Z2 of the groove Y is produced by being distorted in the width direction (axial center direction of the wax tube X) or deformed (deteriorated over time). In FIGS. 5B and 5C, the deformation is emphasized for easy understanding of the deformation state.

  Therefore, the wax tube reading device using a laser is deformed, for example, for a wax tube X whose cross section in the radial direction is centered, that is, a wax tube X deformed in the radial direction, as shown in FIG. Is read as voice data (radial unevenness information in the sound groove Y).

  Further, for example, as shown in FIG. 5C, for the wax tube X in which the sound groove Y is distorted in the width direction, that is, the wax tube X deformed in the axial direction, the laser has a width of the sound groove Y. The position deviating from the center of the direction is read, or the laser is deviated from the sound groove Y that should be read and the adjacent sound groove Y is read. Therefore, such a wax tube reader using a laser reads the deformation of the wax tube X as noise or the like, and therefore cannot accurately read voice data with respect to the deformed wax tube X.

  Therefore, in view of such circumstances, it is an object of the present invention to provide a wax tube reader that can accurately read audio data even for a wax tube that is manufactured distorted or deformed.

A wax tube reading device according to the present invention is a wax tube reading device that reads sound data in a non-contact manner from a cylindrical wax tube having a sound groove representing sound data formed on a surface thereof. calculating a holding portion for rotation about an imaging unit which the imaging device takes an image of the surface of the wax tube from radially, and a control unit for controlling the holding unit and the imaging unit, the audio data of the sound groove from the image data of the captured and an arithmetic unit which, holding part is a wax tube configured to be movable in the radial direction, the control unit detects the radial deformation of the wax pipe between the surface and the imaging unit of the wax tube to maintain the distance constant, based on the contrast of an image captured, the wax tube through the holding portion is moved in the radial direction, characterized in Rukoto.

  According to the present invention, the holding unit holds the cylindrical wax tube and rotates the wax tube around the axial direction. And an imaging part images the surface of a wax tube from the radial direction of a wax tube, and a calculating part calculates the audio | voice data of a sound groove from the image data imaged by the imaging part. As a result, the sound data can be read from the wax tube in which the sound groove representing the sound data is formed on the surface. The holding unit moves the wax tube in the radial direction (the direction in which the imaging unit images the wax tube), so that the wax tube deformed in the radial direction is also between the surface of the wax tube and the imaging unit. The distance is kept constant.

  In the wax tube reading device according to the present invention, the calculation unit calculates the center in the width direction of the sound groove from the image data, and calculates sound data in the sound groove along the center in the width direction of the sound groove. May be configured.

  According to such a configuration, the calculation unit calculates the center in the width direction of the sound groove from the image data, so that the sound groove can be formed along the center in the width direction of the sound groove even for the wax tube deformed in the axial direction. Can be calculated.

  Moreover, in the wax tube reading apparatus according to the present invention, the calculation unit may be configured to calculate the uneven information of the sound groove that becomes the sound data from the density information of the captured image data.

  According to such a configuration, the unevenness information of the sound groove, which is the sound data, can be calculated by the calculation unit from the density information of the captured image data.

  As described above, according to the wax tube reading device according to the present invention, the holding unit moves the wax tube in the radial direction, so that the wax tube surface and the imaging unit are deformed against the wax tube deformed in the radial direction. Since the distance between them is maintained constant, the sound data can be read accurately even for wax tubes that are manufactured distorted in the radial direction or deformed in the radial direction.

  Hereinafter, an embodiment of a wax tube reading apparatus according to the present invention will be described with reference to FIGS. 1 to 2, the same reference numerals as those in FIG. 5 denote the same components or elements as those in the prior art.

  As shown in FIGS. 1 to 3, the wax tube reading device according to the present embodiment includes an imaging device 1 that images the surface of the wax tube X, and a playback device that reproduces sound from the imaging data captured by the imaging device 1. 2 and configured to be able to read voice data from a cylindrical wax tube X having a sound groove Y on the surface.

  The imaging device 1 includes a holding unit 11 that holds the wax tube X, an imaging unit 12 that images the surface of the wax tube X from the radial direction of the wax tube X, and a control unit 13 that controls the holding unit 11 and the imaging unit 12. The image is picked up so that the unevenness information (height and pitch of the unevenness) of the sound groove Y, which is sound data, is displayed as light / dark information (light / dark data). And the imaging device 1 is provided with the box-shaped light-shielding body 14 enclosed from the outer side in order to block the light from the outside used as a disturbance.

  The holding unit 11 includes a holding member 111 that holds the wax tube X from both ends in the axial direction, a first drive unit (circumferential drive unit) 112 that rotates the wax tube X around the axial direction of the wax tube X, and In order to maintain a constant distance between the second drive unit (axial drive unit) 113 for moving the wax tube X in the axial direction of the wax tube X and the surface of the wax tube and the imaging unit, A third drive unit (radial direction drive unit) 114 that moves X in the radial direction of the wax tube X (the direction in which the imaging unit 12 images the wax tube X).

  The holding member 111 includes a pair of holding member pieces (a first holding member piece and a second holding member piece) 111a and 111b that are spaced apart from each other in the vertical direction, and a handle 111c for making the wax tube X detachable. The first holding member piece 111a disposed above is configured to be movable in the vertical direction. Further, the pair of holding member pieces 111a and 111b are configured to be able to hold the wax tube X by tapering the tip sides facing each other and fitting each tip into the opening end of the wax tube X. The

  The first drive unit 112 includes a motor 112a serving as a drive source, and a transmission unit (belt mechanism) 112b that transmits the drive of the motor 112a to the holding unit 111 (second holding member piece 111b). And the 1st drive part 112 enables the image pick-up part 12 to image the circumferential direction whole region (all the circumferences) of the wax pipe X. FIG.

  The second drive unit 113 includes a motor 113a serving as a drive source, and transmission means (a screw mechanism) 113b that converts the rotational drive of the motor 113a into a vertical drive (vertical direction) linear drive and transmits the linear drive to the holding unit 111. Prepare. And the 2nd drive part 113 enables the imaging part 12 to image the axial direction whole region (full length) of the wax pipe X. As shown in FIG.

  The third drive unit 114 includes a motor 114a serving as a drive source, and a transmission unit (screw mechanism) 114b that converts the rotational drive of the motor 114a into a linear drive in the horizontal direction (horizontal direction) and transmits the linear drive to the holding unit 111. Prepare. And the 3rd drive part 114 makes the wax pipe X contactable / separable with respect to the imaging part 12 in the direction where the wax pipe X and the imaging part 12 oppose.

  The imaging unit 12 includes a light source 121 that emits light toward the wax tube X, an optical system 122 that collects light reflected by the wax tube X, and an imaging element that receives the light collected by the optical system 122. 123.

  The light source 121 is indirect illumination (dome illumination) using internal reflection in the hemispherical reflector, and is configured to prevent shadows due to the unevenness of the sound groove Y. Specifically, the light source 121 includes an annular lighting fixture 121a and a hemispherical (dome-shaped) reflection plate 121b that reflects light, and is configured to irradiate the surface of the wax tube X with uniform diffused light. Is done.

  More specifically, the light source 121 is configured to generate diffused light by the light emitted from the lighting fixture 121a being reflected by the reflecting plate 121b and irradiate the diffused light toward the wax tube X. The In addition, in order to prevent light from being directly irradiated to the wax tube X from the lighting fixture 121a, the reflection plate 121b is provided with a projecting portion 121c projecting inward at an opening end portion and a central portion (semispherical shape). A top 121) is provided with an opening 121d.

  The optical system 122 includes one or more lenses, and is configured to collect light reflected by the surface of the wax tube X and passing through the opening 121d of the reflector 121b. The optical system 122 is arranged in series between the light source 121 and the image sensor 123. The optical system 122 is a magnifying optical system, and further employs a telecentric optical system in order to acquire an image without a perspective.

  The image sensor 123 is a sensor formed in a line shape, and is arranged in parallel with the axial direction of the wax tube X. Specifically, the image sensor 123 is a high-resolution (for example, resolution 44,450 dpi) line CCD sensor, and is configured to be able to image a portion along the axial center direction on the surface of the wax tube X.

  The control unit 13 controls the first driving unit 112 and the second driving unit 113 so that the imaging unit 12 images the entire circumference and the entire length of the wax tube X. And the control part 13 detects the deformation | transformation of the radial direction of the wax pipe X, and controls the 3rd drive part 114 in order to maintain the distance between the surface of the wax pipe X and the imaging part 12 constant. Specifically, the control unit 13 includes a board on which electronic components are mounted.

  Specifically, as the first step, the control unit 13 moves the wax tube X by the third driving unit 114, and the contrast of the image captured by the imaging unit 12 with respect to each part of the wax tube X is determined. Is detected and stored, and as the second step, the first drive unit 112, the second drive unit 113, and the third drive unit 114 are continuously driven, and the imaging unit 12 The surface of X is continuously imaged.

  The reproduction device 2 includes an input unit 21 that acquires image data of the wax tube X imaged by the imaging device 1, a calculation unit 22 that calculates sound data of the sound groove from the image data acquired by the input unit 21, and a calculation unit And an output unit 23 that outputs (reproduces) the sound data calculated in 22 as sound.

  The calculation unit 22 includes an extraction unit 221 that extracts audio data from the image data acquired by the input unit 21, and a conversion unit 222 that converts the audio data extracted by the extraction unit 221 into an audio waveform.

  As the first step, the extraction unit 221 performs appropriate image processing in order to appropriately display the density information of the image data that is the sound data of the sound groove Y. Specifically, the extraction unit 221 performs image processing by applying an appropriate 16-bit tone curve to image data in which the unevenness information appears as grayscale information. More specifically, the extraction unit 221 automatically selects the optimum 8 bits out of 16 bits according to the state of each wax tube X and performs image processing.

  The extraction unit 221 is configured to calculate the center in the width direction of the sound groove Y from the image data as the second step. Specifically, the extraction unit 221 calculates the center in the width direction from the edge (both side edges) of the sound groove Y.

  Further, as a third step, the extraction unit 221 is configured to extract (calculate) density information of image data that is audio data of the sound groove Y along the center in the width direction of the sound groove Y. Specifically, the extraction unit 221 extracts the density information of the image data at the center in the width direction of the sound groove Y, that is, the density information of the center line of the sound groove Y in the image data.

  The conversion unit 222 converts (calculates) the shading information extracted by the extraction unit 221 into the unevenness information of the sound groove Y. Then, the conversion means 222 creates a speech waveform by arranging the converted uneven information of the sound groove Y in time series.

  The output unit 23 is configured to be able to reproduce sound from the sound waveform converted by the conversion means 222. Note that the output unit 23 may output a speech waveform as data (for example, output as a file).

  The configuration of the wax tube reading device according to the present embodiment is as described above. Next, the operation of the wax tube reading device according to the present embodiment will be described.

  First, with the tip (upper end) of the second holding member piece 111b fitted in the opening end on the lower side of the wax tube X, the first holding member piece 111a is lowered via the handle 111c, and the first holding member The tip (lower end) of the member piece 111a is fitted into the upper open end of the wax tube X. Thereby, the holding member 111 holds the wax tube X.

  Then, the first drive unit 112 rotates the wax tube X around the axial direction of the wax tube X, and the second drive unit 113 moves the wax tube X in the vertical direction. At this time, in order to detect the radial deformation of the wax tube X, the control unit 13 causes the third driving unit 114 to move the wax tube X in the radial direction with respect to each part (each imaging target part) of the wax tube X. The position where the contrast of the image captured by the imaging unit 12 is maximum is detected.

  At the same time, the control unit 13 sets the position relative to each part (each imaging target part) of the wax tube X, that is, the position in the circumferential direction by the first driving unit 112 and the position in the axial direction by the second driving unit 113. The radial position by the three driving units 114 is stored. Specifically, the control unit 13 stores the position of the wax tube X at which the distance between the surface of the wax tube X and the imaging unit 12 is constant.

  Thereafter, the control unit 13 controls each of the driving units 112, 113, and 114, so that the imaging unit 12 is connected to the wax tube X in a state where the distance between the surface of the wax tube X and the imaging unit 12 is maintained constant. The surface is imaged continuously. Thereby, the imaging unit 12 is in a state in which the light source 121, the optical system 122, and the imaging element 123 are arranged at fixed positions with respect to each part (imaging target part) of the wax tube X, that is, under the same condition (irradiation light amount). , Irradiation angle, light receiving angle, distance, etc.).

  Then, in the imaging unit 12, the light source 121 emits uniform diffused light, and further, in the light reflected by the wax tube X by the optical system 122, in the height direction (in the radial direction of the wax tube X) that is uneven information. The image sensor 123 receives only light reflected in the direction in which the wax tube X and the image sensor 123 are opposed to each other, thereby acquiring image data in which the unevenness information of the sound groove Y is expressed as grayscale information. .

  Specifically, as shown in FIG. 4A, image data is acquired in which a portion with a deep unevenness is light and a portion with a shallow unevenness is dark. As described above, the imaging device 1 acquires image data in which the unevenness information, which is the audio data of the sound groove Y, is represented as light and shade information by imaging the surface of the wax tube X.

  Next, the playback device 2 acquires the image data acquired by the imaging device 1 with the input unit 21. Then, the extraction unit 221 of the calculation unit 22 applies a 16-bit tone curve and performs image processing on the acquired image data. After that, the extraction unit 221 calculates the center in the width direction from the edge of the sound groove Y, and extracts the light / dark information of the image data at the center in the width direction of the sound groove Y.

  Then, the converting means 222 converts the extracted shade information into the uneven information of the sound groove Y, and arranges the converted uneven information of the sound groove Y in time series, as shown in FIGS. 4B and 4C. Create a speech waveform. Note that the audio waveform in FIG. 4B is an audio waveform obtained by converting the image data in the upper groove G of FIG. 4A, and the audio waveform in FIG. 4C is that in FIG. An audio waveform obtained by converting image data in the lower sound groove Y is shown.

  Thereafter, the output unit 23 outputs (reproduces) the sound from the sound waveform created by the conversion means 222 to the outside. As described above, the playback device 2 outputs (plays back) sound to the outside from the image data in which the unevenness information of the sound groove Y is represented as grayscale information.

  As described above, in the wax tube reading apparatus according to the present embodiment, the imaging unit 12 images the surface of the wax tube X from the radial direction of the wax tube X, and the calculation unit 22 uses the image data captured by the imaging unit 12 as the sound groove Y. The voice data is calculated. Therefore, the voice data can be read from the wax tube X having the sound groove Y on the surface.

  Further, in the wax tube reading device according to the present embodiment, the holding unit 11 moves the wax tube X in the radial direction (the direction in which the imaging unit 12 images the wax tube X), and thereby the wax tube X deformed in the radial direction. However, since the distance between the surface of the wax tube X and the imaging unit 12 can be kept constant, the voice data can be accurately read even for the wax tube deformed in the radial direction. .

  In addition, the wax tube reading device according to the present embodiment is configured so that the calculation unit 22 calculates the center in the width direction of the sound groove Y from the image data, so that the sound groove is also generated for the wax tube X deformed in the axial direction. Since the sound data of the sound groove Y can be calculated along the center in the width direction of Y, the sound data can be accurately read even for the wax tube deformed in the axial direction.

  Moreover, since the light source 121 is a dome illumination, the wax tube reader according to the present embodiment irradiates uniform diffused light having no directivity, and as a result, prevents the unevenness of the sound groove Y from being generated. . Since the optical system 122 is a telecentric optical system, an image that is not parsed can be acquired over the entire area of the data.

  Therefore, with respect to the sound groove Y of the wax tube X formed of the same material and the same color, the unevenness information (height and pitch) of the sound groove Y can be accurately acquired as the density information of the image data, and in addition, the calculation Since the unit 22 also performs image data optimization processing, the calculation unit 22 calculates the unevenness information (height and pitch) of the sound groove Y that becomes the audio data from the density information of the image data captured by the imaging unit 12. Can do.

  The wax tube reading device according to the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

  For example, in the wax tube reading device according to the present invention, the calculation unit 22 may have a noise removal function in order to improve the voice data. For example, the extraction unit 221 may perform various types of image filter processing when extracting the grayscale information of the image data, and the conversion unit 222 discriminates the audio component and the noise component from the audio waveform, and determines the noise component. You may perform the process to remove.

  In the wax tube reading device according to the above embodiment, the calculation unit 22 calculates the unevenness information of the sound groove Y from the density information of the center line of the sound groove Y in the image data. Absent. For example, the calculation unit obtains the unevenness information of the sound groove Y from the density information of a line parallel to the center line of the sound groove Y in the image data (a line within the sound groove Y and slightly deviated from the center line). You may calculate.

  Further, the calculation unit may calculate voice data (voice waveform) by calculating the movement (vibration) of the needle from the width dimension of the edge (both side edges) of the sound groove Y in the image data. And by calculating voice data by combining the above calculation methods, the voice data can be read accurately even for wax tubes X that are partially damaged or missing.

1 is an overall schematic diagram of a wax tube reading device according to an embodiment of the present invention. It is a principal part enlarged view of the imaging device (holding part) of the wax tube reader which concerns on the same embodiment, Comprising: A perspective view is shown. It is a principal part enlarged view of the imaging device (imaging part) of the wax tube reader which concerns on the same embodiment, Comprising: A perspective view is shown. It is a reading figure of the wax tube reading device concerning the embodiment, (a) is image data which imaged the sound groove of the wax tube, (b) is a voice waveform concerning the sound groove on the upper stage side of (a), ( c) shows a speech waveform relating to the lower groove on (a). It is explanatory drawing of the conventional wax tube, Comprising: (a) is a whole perspective view, (b) is a top view when deform | transforming to radial direction, (c) is an enlarged front view in the A area | region when deform | transforming to an axial direction. The figure is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Imaging device, 2 ... Playback apparatus, 11 ... Holding part, 12 ... Imaging part, 22 ... Calculation part, X ... Wax pipe, Y ... Sound groove

Claims (3)

In a wax tube reader for reading voice data in a non-contact manner from a cylindrical wax tube having a sound groove representing voice data formed on the surface thereof,
A holding unit that holds the wax tube and rotates around the axial center direction, an imaging unit in which the imaging element images the surface of the wax tube from the radial direction, a control unit that controls the holding unit and the imaging unit, and a captured image A calculation unit that calculates voice data of the groove from the data,
The holding portion is configured to move the wax tube in the radial direction ,
The control unit detects the deformation in the radial direction of the wax tube and maintains a constant distance between the surface of the wax tube and the imaging unit, based on the contrast of the image to be captured, through the holding unit. wax tube reader characterized Rukoto is moved in the radial direction.   The wax tube reading device according to claim 1, wherein the calculation unit is configured to calculate a center in the width direction of the sound groove from the image data, and to calculate sound data of the sound groove along the center in the width direction of the sound groove. apparatus.   The wax tube reading device according to claim 1, wherein the calculation unit is configured to calculate unevenness information of a sound groove, which is sound data, from the density information of the captured image data.

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