RU196147U1 - OPTICAL PAWNER FOR MUSICAL INSTRUMENT - Google Patents

Abstract

An optical pickup for a musical instrument containing an optical radiation source, an optical radiation separation element, an optical radiation combining element, an optical radiation receiver, characterized in that it has two independent propagation paths of optical radiation optically isolated from the external environment. A useful model allows to achieve the following technical result : 1) reduce the overall dimensions of the optical pickup; 2) eliminate the influence of external optical radiation and optical environmental properties on the sound quality. The claimed technical results are achieved by the presence of two independent propagation paths of optical radiation that are optically isolated from the external environment. A useful model can be used in musical instruments according to group G10 for recording sound vibrations and converting them into an optical signal.

Description

Field of Technology:

The utility model can be used in musical instruments according to group G10 for recording sound vibrations and converting them into an optical signal.

The prior art:

Known technology for recovering an audio signal through vibration of an optical fiber (Optical fiber vibration sensing wavelet signal audio restoration technology based on backward rayleigh scattering echo phase angle change: Pat. 106972886 China: IPC G10L21 / 02; H04B10 / 07; H04B10 / 2537 / ZHANG JIE [ CN], applicant and patent holder PHOTON RAYLEIGH TECH (BEIJING) CO LTD [CN]; published March 29, 2017). The technology is based on the phenomenon of Rayleigh scattering of light propagating through an optical medium, in particular along an optical fiber. The invention uses a pulsed laser source and a time synchronized detector and a computer. The technology cannot be applied to a musical instrument due to the fact that it has a relatively long time between measurements and does not allow recording the shape of the acoustic signal.

Known optical sensor for string electrodynamic instruments (Light beam shaping in an optical pick up for a musical instrument: US Pat. 8071870 United States of America: IPC G10H3 / 06 / BAILEY JAMES S [US]; BAILEY KENNETH R [US], applicant and patentee BAILEY JAMES S [US]; BAILEY KENNETH R [US]; publ. 06.12.2011). The sensor detects vibration of a string passing through a beam of light that is detected by an optoelectronic converter. The sensor is sensitive to external optical radiation, as the propagation medium of optical radiation is not isolated from the external environment, the invention also places high demands on the optical properties of the string and the external environment, because the quality of sound extraction depends on them.

Known optical sensor for a musical instrument (Optical Instrument Pickup: US Pat. 2015317967 United States: IPC G10H1 / 00; G10H3 / 06; G10H3 / 18 / HADDAD WALEED SAMI [US], applicant and patent holder LIGHT4SOUND [US]; publ. 05.11. 2015). The sensor has at least one light source directed to the string of the musical instrument and at least one photodetector for detecting light reflected from the string. To eliminate unwanted effects, filters are used, including optical filters. The sensor is sensitive to external optical radiation, as the propagation medium of optical radiation is not isolated from the external environment, the invention also places high demands on the optical properties of the string and the external environment, because the quality of sound extraction depends on them.

The closest analogue in terms of features of the utility model is a fiber optic pickup system based on the principle of operation of the Sagnac interferometer (Optical fiber pickup system based on Sagnac interference principle: Pat. 110086537 China: IPC G10L25 / 78; H04B10 / 079; H04B10 / 25 / SUN QIANG [CN], applicant and patent holder UNIV BEIJING JIAOTONG [CN]; publ. 23.03.2019). The system consists of an optical radiation source, an optical splitter, an optical signal combining point, an optical signal receiver. Optical radiation propagates along the same optical path in opposite directions, and therefore requires the propagation path of optical radiation of large length and large overall dimensions of the system.

Disclosure of utility model:

The utility model is intended for recording sound vibrations and converting them into an optical or electrical signal through exposure to optical radiation.

The utility model allows to achieve the following technical result:

1) reduce the overall dimensions of the optical pickup;

2) to exclude the influence of external optical radiation and the optical properties of the external environment on the quality of sound extraction.

The claimed technical results are achieved by the presence of two independent propagation paths of optical radiation, optically isolated from the external environment.

In FIG. 1 shows the design of an optical pickup for a musical instrument: 1 - a source of optical radiation; 2 - element for the separation of optical radiation; 3 - the first path of propagation of optical radiation; 4 - the second path of propagation of optical radiation; 5 - element combining optical radiation; 6 - receiver of optical radiation; 7 - signal output; 8 - external environment; 9 - optical isolating element.

Two paths of propagation of optical radiation (3) and (4) are of small length and allow you to make a pickup of small overall dimensions.

The optical insulating element (9) serves to optically isolate the propagation paths of optical radiation (3) and (4) from the external environment (8), which eliminates the influence of external optical radiation and the optical properties of the external environment (8) on the sound quality.

The utility model can be used in string, bow, percussion and other musical instruments for recording sound vibrations of a string or resonator in an optical or electrical signal.

Implementation of a utility model:

Optical radiation is generated by the optical radiation source (1), enters the optical radiation separation element (2), passes through two independent, optically isolated, optical radiation propagation paths (3) and (4), is combined in the optical radiation combining element (5), enters the optical radiation receiver (6), from which it enters the signal output (7). Sound vibrations affect the propagation paths of optical radiation (3) and (4) and cause a change in their optical lengths. Due to the optical isolation of paths (3) and (4), when optical radiation is combined on element (5), the resulting interference leads to a change in the optical radiation power at receiver (6), which is the output signal supplied to the output of signal (7).

The utility model can be implemented on the basis of integrated or fiber optics technologies.

Claims (5)

1. An optical pickup for a musical instrument, comprising an optical radiation source, an optical radiation separation element, an optical radiation combining element, an optical radiation receiver, characterized in that it has two independent propagation paths of optical radiation that are optically isolated from the external environment. 2. An optical pickup for a musical instrument according to claim 1, characterized in that the propagation path of the optical radiation is made in the form of an optical fiber. 3. An optical pickup for a musical instrument according to claim 1, characterized in that the propagation paths of optical radiation have a difference in optical lengths less than the coherence length of the optical radiation source. 4. An optical pickup for a musical instrument according to claim 1, characterized in that the optical radiation receiver comprises an optoelectronic element. 5. An optical pickup for a musical instrument according to claim 1, characterized in that the function of the optical radiation separation element and the optical radiation combining element is performed by one element.

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