Sound resonance calculator. Boundary of sound pressure zone F2 34 Hz.

• Sound resonance calculator The attenuation, , is defined as the fraction of the power lost (i. Cylindrical This calculator uses the equations in the table to calculate the fundamental frequency. At other times, resonance can cause serious problems. (Spectroid app linked below can help you find the frequency) – At the bottom of the page is a calculator for a Helmholtz resonator chamber . How to find the resonant frequency of a string or pipe. Why is resonant frequency important? It helps in tuning circuits, optimizing vibrations, and understanding natural frequencies. Boundary of sound pressure zone F2 34 Hz. The air in a tube, such as found in a musical instrument like a flute, can be forced into resonance and produce a pleasant sound, as we discuss in Sound. The natural resonant frequency of a material is based on its physical dimensions and the speed of sound in the material (‘c’). 2 x the actual thickness of the slat) D = depth of box. This phenomenon is important in acoustics and physics, especially when designing musical instruments, pipes for ventilation systems, or other engineering applications where sound properties are critical. (1. For "Soft Ground" G = 1. One of the forks is being hit with a rubberized mallet. This tool calculates the resonance based on the cavity’s dimensions and shape, helping engineers and designers optimize acoustic performance. This resonant frequency calculator employs the capacitance (C) and inductance (L) values of an LC circuit (also known as a resonant circuit, tank circuit, or tuned circuit) to determine its resonant frequency (f) amroc - The Room Mode Calculator amroc pro - for non-rectangular rooms NEW amray - The Raytracing Sketchpad amalyzer - analyze a room, voice, song amrev - The Reverberation Time Calculator Other quality tools Nov 27, 2024 · The Closed Pipe Resonance Calculator helps determine the resonant frequency of sound waves in a pipe that is closed at one end. The yearly mean for June 2002 through May 2003 is 7. The wavelength of sound is inversely proportional to the frequency of sound. In real-life applications, calculating the resonant frequency is vital for structural engineers to ensure the stability and safety of various structures, such as buildings, bridges, and towers. Aug 13, 2020 · Table \(\PageIndex{1}\) For many musical instruments that are made of a tube, the tube is closed at one end but opened at the other. So when that low A is played it will sound much louder than other notes. , 1/Q ) per unit length of sound propagation, and thus is equal to α = ƒ/vQ = ∆ ƒ/v ( 7 ) Stop! Oct 7, 2023 · The AMROC calculator is a valuable tool for acoustical engineers, audio enthusiasts, and anyone dealing with room acoustics. The lower chart shows the monthly and yearly mean values of the fundamental Schumann resonance frequency in two frequency bands. By inputting specific parameters, this calculator provides precise volume measurements essential for optimal speaker performance. Convert between dB and dBC. Enter the inductance and capacitance and in no time at all you'll find the resonant and angular frequency. The frequency constant (N) is defined as the controlling dimension (t) multiplied by the frequency (Fr): N = Fr x t Eqn. FAQs on Helmholtz Resonator Calculator: What is a Helmholtz Resonator? It’s a device that resonates at a specific frequency, amplifying certain frequencies of sound. So in some cases, you might want to “detune” certain notes to create a more harmonic sound. While such resonance is very rare and difficult to achieve, it is possible. This calculator provides accurate Q factor values based on horizontal and vertical coverage, crucial for understanding and optimizing the resonant The word resonance comes from Latin and means to "resound" - to sound out together with a loud sound. Feb 15, 2025 · 8. Jul 24, 2023 · All Frequency Calculators; Resonant Frequency Calculator; Belt Tension Frequency Calculator; Frequency Factor Calculator; Room Resonant Frequency Formula. At constant temperature the speed of sound is fixed; in addition, for a given tuning fork the frequency is also fixed, then according to eqn. Unveiling the Acoustic Formula for Perfect Sound Aug 30, 2004 · The formula for calculating the resonant frequency of a Helmholtz resonator is: Where f is the resonant frequency (Hz), c is the speed of sound (1120ft/s), p =3. How do I reduce unwanted resonance? By using sound-absorbing materials like foam, carpets, and As such, the cables on these sensors have fundamental frequencies that may cause the cable to resonate. In air, the pressure reference value is . The formula used to calculate the resonance frequency in a box-shaped space is: Hence, the resonant frequency of the suspension bridge structure is approximately 0. 92 Hz Conclusion: The resonance frequency calculators and formulas help us to calculate the resonant frequency of LC, RC, and RLC circuits which is useful in filter designs, radio frequency tuning circuit designs and antenna design. The resonant frequencies of air columns depend upon the speed of sound in air as well as the length and geometry of the air column. You may also provide a Quality Factor, a Series Resistance, or a Shunt Resistance and the two unspecified values will be calculated. A closer look at earthquakes provides evidence for It’s a common thing to deal with a non-changeable form room. Resonant frequency is usually denoted as f 0. This means that the higher the frequency, the shorter the wavelength. Jul 31, 2024 · The "Resonant Frequency Calculator" is an easy-to-use tool designed to simplify the process of calculating resonant frequency, capacitance, or inductance in a resonant circuit. or Frequency = velocity divided by wavelength f = v/λ f= 340m/s / (. FAQs on Speed of Sound Calculator: What is the Speed of Sound? It’s the speed at which sound waves travel through a medium. 6 feet. The purpose of the above calculator is to provide a tool to estimate the fundamental frequency of SpaceAge Control position transducer cables. It helps us understand and predict the resonant frequencies or room modes within a given space. 1 Mar 18, 2019 · Agreed about getting to 9-11Hz resonance range. I use this handy resonance calculator - Vinylengine resonance calculator. Imagine a sound wave travelling towards the wall. Through an understanding of the properties of waves and the conditions necessary to establish standing waves in this scenario, students will calculate the speed of sound in air at room temperature, and the wavelength of sound An actual overtone of a frequency does sound more harmonic than the frequency of a musical note. Example Calculation. Oct 14, 2024 · The 'Speaker Box Calculator' is an ingenious tool designed to help audio enthusiasts and DIY builders create the ultimate speaker enclosure. (Note: With this Overtone and Harmonics Calculator you can only determine the frequencies for notes like a major 3rd or a major 5th for example. 355 Hz. Essentially a hollow sphere with a short, small-diameter neck, a Helmholtz resonator has a single isolated resonant frequency and no other resonances below about 10 times that Sound Propagation and Resonance calculators give you a List of Sound Propagation and Resonance Calculators. I'm not saying the /nL part is wrong for the relative harmonics but you need a different c. 93 nm. Can resonance cause noise problems? Yes, unwanted resonance can lead to echoes, standing waves, and sound distortion. C-weighting Calculator. Choose the type of chamber you are considering. ; Real-Life Application. Examples include roads and paved areas. 85 Hz. Oct 3, 2024 · The Cavity Resonance Calculator helps in determining the resonance frequency of a cavity, which is a crucial factor in various fields such as microwave engineering, optics, and acoustics. Nov 5, 2022 · The Helmholtz resonator calculator can easily find the resonant frequency for any given cavity just from its volume and aperture's dimensions. As usual, the amplitude is limited in practice by damping, which in this case arises from viscous losses and from sound radiation. How do I calculate resonant frequency? Use the formula: f_resonant = 1 / (2 * π * √(L Mar 22, 2025 · The Resonant Frequency Calculator helps you find the natural frequency at which different systems oscillate with maximum efficiency. w = slat width. Background. Low Frequency Enclosures - Car Audio - Home Theater Sound System. How does temperature affect sound speed? Higher temperatures increase the speed of sound, affecting resonance calculations. Upper boundary of audible range F5 20000 Hz. Resonance is witnessed in objects in equilibrium with acting forces and could keep vibrating for a long time under perfect conditions. This case is complicated because the body can swell a little when the air pressure rises inside – and also because the air 'in' the sound hole of the guitar has a geometry that is less easily visualised than that in the neck of a bottle. Sound can "re-sound" or resonate when the source waves are added constructively to the sound bouncing back and forth inside a resonant chamber. What exactly are room modes? Room modes are caused by the standing wave effect which is determined by the wavelength of the sound wave and the dimensions of the room. 10. Enhance sound quality in architectural acoustics. The speed is equal to 4960 ft/s this time. 1 The time required to complete a full cycle (i. Hard ground reflects sound waves. 14, S is the area of the port (ft 2 ), L is the length of the port (ft), and V is the cavity volume (ft 3 ). This room also has a longer reverb time at that pitch, so low A notes will sustain longer and conflict with other bass notes that follow. Speakers using a voice coil also have an interesting behavior: at a center frequency called the resonant frequency, both the mechanical parameters (magnet and speaker cone + bobbin assembly) and electrical properties react and show a peak impedance above the manufacturer’s Ohms rating. where λ is the sound wavelength. I also created some headshell weights in order to dial this in on tonearms that might be light in mass compared to the compliance of a given cartridge. Sound waves are reflected or absorbed by the ground depending upon the frequency of the sound wave and how porous the ground is (indicated by the "Ground Factor" value G). The wavelength of sound is usually measured in meters. Optimize acoustic properties of musical instruments. Oct 3, 2024 · \( RRF \) is the Room Resonant Frequency in Hertz (Hz) \( L \) is the length of the longest dimension of the room in feet (ft) \( 1130 \) is the speed of sound in air in feet per second (ft/s) at room temperature. Radio Frequency Engineering Calculator. ; f 0 is the resonant frequency of the speaker system (in hertz). Although the first tuning fork hasn't been hit, the other fork is visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air by hitting the other fork, creating an acoustic resonance between the forks. Aug 30, 2004 · A 10 foot cube shaped room will have a strong inherent resonance near 55 Hz, which is the open A string on a bass. The calculation of the Q factor in speaker sound has practical applications in various engineering fields, particularly in audio system design and music production. The temperature it shows in Resonance is indicated by the sudden increase in the intensity of the sound when the column is adjusted to the proper length. 3. We offer you four different possibilities: Arbitrary shape; Parallelepipedal shape; Spherical shape; and. A circuit with an inductor (L) and capacitor (C) connected in parallel or series will have a resonant frequency at which their impedances are equal. The following two example problems outline the steps and information needed to calculate the Room Resonant Frequency. The speed of sound calculator displays the speed of sound in water; it's 4672 ft/s. 81 THz. FAQs on Resonant Frequency Calculator. Resonant Frequency calculator uses Resonant Frequency = Natural Frequency of Oscillation*sqrt(1-2*Damping Ratio^2) to calculate the Resonant Frequency, Resonant Frequency formula is defined as the frequency at which the magnitude of the frequency response has peak value for the first time. Feb 11, 2023 · Resonant Frequency (f) = Velocity of Sound (v) / 4 * Length (L) Plugging in the values, we get: Resonant Frequency (f) = 5000 m/s / 4 * 50 mm = 5000 / 200 = 25 kHz. Remember that you can always change the units of speed of sound: mph, ft/s, m/s, km/h, even to knots if you wish to. The sound pressure level is a logarithmic measure of the effective pressure of a sound relative to a reference value. Feb 7, 2024 · The resonant frequency of a room calculator helps in determining the frequency at which sound waves resonate within a space. You can check it with the sound wavelength calculator. Resonance can occur, for example, when air passes through a cavity, such as when blowing the neck of an empty bottle. Cavity resonance occurs when electromagnetic waves resonate within a closed structure or cavity, creating standing wave patterns. If you are interested in a resonant frequency for a really hot cavity, then you could calculate a sound speed from the more accurate gas equation and plug it in the sound speed box. Schroeder's frequency F3 210 Hz. Similarly, resonance can be a factor in room Experiment using two tuning forks oscillating at the same frequency. Keep reading while we explain everything you need to know about Helmholtz resonators! Oct 8, 2024 · Determine the resonant frequency for custom-built resonators. If you would like to calculate the resonant frequency of an LC circuit, look no further — this resonant frequency calculator is the tool for you. What is a ported speaker box? Air Column Resonance. Oct 12, 2024 · Presenting the Resonant Frequency Calculator by Newtum (Last Updated On: 2024-10-12) Discover the precision and ease of calculating resonant frequencies with Newtum's Resonant Frequency Calculator, a must-have tool for any electrical enthusiast or professional. So in this example, the resonant frequency of the transducer is 25 kHz, which represents the frequency at which the transducer will produce its maximum output for a given input. It follows that a high-Q resonator can transmit a signal at its resonant frequency with very little attenuation. The equivalent RGB colors (shown above) that approximate this color of light are #750000, based on a modified version of Dan Bruton's color approximation algori We would like to show you a description here but the site won’t allow us. This tool is designed to calculate the resonant frequency of a tank circuit if the capacitance and inductance values are known. If a room is 18ft long then the first modal resonance will be at 31Hz. This resonant frequency is pivotal for architects, sound engineers, and designers aiming to create an environment with the desired acoustic properties. For "Hard Ground" G = 0. DIY Audio & Video Tutorials, FAQs, Calculators and Examples for Speaker Boxes, Crossovers, Filters, Wiring, Home Automation, Security & more The Speaker Sound Q Calculator is an advanced tool designed for engineers and audio professionals who require precise calculations of the Q factor for detailed resonance analysis of loudspeakers. Where: Q is the Q factor. This color has a wavelength of 736. Subwoofer Box Comparison Calculator: Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program. You can use a speaker box calculator, such as the Thiele-Small calculator, to determine the optimal box volume for your speaker driver and enclosure. What is resonant frequency? It’s the frequency at which a system naturally oscillates. THere are many resources online for measuring driver characteristics. 9. Remember that real-life results may vary from ideal models. Tables. To calculate the room resonant frequency for a room with the longest dimension of 15 feet: Mar 16, 2025 · There are other numerous examples of resonance in standing waves in the physical world. 3 feet, double that would be 22. The resonance is a standing wave phenomenon in the air column and occurs when the column length is: λ/4, 3λ/4, 5λ /4. When calculating the resonant frequency of a room, you will need to double the longest dimension because when sound travels along that route, it will bounce back and cover the same distance again. Instead of c, the speed of sound in air, you have to use the speed of sound in the string, which is a function of mass and tension (othwrwise the tuning pegs would have no effect). If the volume of the cavity changes, the resonant frequency changes. Analyze songs, search for room modes, find the pitch, melody or chords of a song, analyze noise, train your ears and singing and much more Amcoustics Amalyzer - analyze whatever makes a sound Resonance obviously occurs when $$\omega = c \sqrt{\frac{S}{VL}} . Fundamental Frequency Calculator. To find the resonant frequency of a single continuous wave, we use the Another interesting phenomenon due to the interaction of waves with different frequencies is resonance. A tool perform calculations on the concepts and applications into Sound Propagation and Resonance. 10m x 4) Cavity resonance occurs when waves, such as sound waves or electromagnetic waves, are confined within a specific cavity or resonator and resonate at specific Resonant frequency is the natural frequency where a medium vibrates at the highest amplitude. For chimes it's material dependent. Slim Jim and J Pole calculator; 1/4 Wave Ground Plane Antenna Calculator; Ohms Law Calculator; dBm, dBW, µW, mW, Watt, KW and MW Calculator; Loaded Quarter Wave Antenna Inductance Calculator; ERP & EIRP Calculator; Resonant Frequency Calculator; PI attenuator calculator; T attenuator calculator; Air Cored Inductor Calculator; Inverted Vee Antenna LCR Resonance Provide two of Frequency, Inductance or Capacitance and the calculator will find the resonant frequency. Boundary of reflection zone F4 840 Hz. ; Δf is the bandwidth of the speaker system (in hertz). Nov 12, 2024 · Use this cavity resonance calculator to determine the resonance frequency of a cavity based on its dimensions and the speed of sound. Airborne Sound. One of our best models of resonance in a musical instrument is a resonance tube (a hollow cylindrical tube) partially filled with water and forced into vibration by a If a resonance condition is met, the open end of the tube has maximum amplitude of standing sound waves and is called an anti-node. DIY Audio & Video Tutorials, FAQs, Calculators and Examples for Speaker Boxes, Crossovers, Filters, Wiring, Home Automation, Security & more ν = speed of sound in air (room temperature)~ 330-340 m/s λ = wavelength (4 X’s the length of the tube measured in meters) 10cm = . As you will be able to see by experimenting, this happens when the length of the tube matches up with the wavelength in just the right proportions. The Resonance Frequency Calculator is a tool that helps determine the natural rely on resonance to amplify sound. Let's compare it with 90 °F (warm bath temperature). You will need a power amp, a variable frequency source, and a DMM. Why does sound travel differently in different media? May 6, 2024 · Speaker resonance and peak Ohms at the resonant frequency. A room mode is a specific frequency at which sound waves resonate in an enclosed space, such a The word resonance comes from Latin and means to "resound" - to sound out together with a loud sound. How is Speed of Sound calculated? Use the formula: c = √(γ * R * T), where γ is the adiabatic index, R is the gas constant, and T is temperature in Kelvin. If Mar 4, 2025 · Sound - Helmholtz Resonator, Acoustics, Vibrations: An important type of resonator with very different acoustic characteristics is the Helmholtz resonator, named after the German physicist Hermann von Helmholtz. This causes a strong standing wave to develop in the tube and the sound gets louder. Upon hitting the wall, it reflects, and the sound wave will bounces back into the room. Use the given calculator to find the velocity (v in m/s) of sound through your medium, or enter it below. amplified through resonance, which is an increase in the amplitude of a wave at a specific frequency. How is the resonant frequency calculated for Helmholtz Resonators? Use the formula: f = (c / (2 * π)) * √(A / (V * (L + S))). In these cases, natural resonance of the room can extremely negatively affect the equipment’s sounding. The calculator takes into account factors such as the driver’s resonant frequency, Q factor, and compliance to calculate the most efficient and accurate box volume. e. Aug 24, 2022 · One wavelength is the distance between two compressions or two rarefactions in a sound wave. As can be seen from a sample waveform, the even harmonics missing from the tone, at least for the lower range of the instrument. Sep 13, 2024 · The Box Resonance Calculator uses the dimensions of a box and the speed of sound to compute the resonance frequency, providing valuable insights for sound engineers, architects, and hobbyists. Details The resonant color of light that is 40 octaves above an F # 4 at standard pitch A4=440 has a frequency of 406. The clarinet consists of an approximate closed cylinder, and this makes clarinet acoustics quite different from the other woodwind instruments. Look at what it says for strings. Cavity Resonance Calculator This calculator determines the lowest cavity resonant frequencies of rectangular enclosures, cylindrical enclosures and rectangular circuit-board plane pairs. This value is near the absolute threshold of human hearing, which is the minimum sound level that a human can hear. Sep 30, 2023 · The calculator needs two numbers, the temperature of the exhaust gas entering the resonator and the frequency of the sound you want to reduce. Note the requirement that the units of measurement are constant. Resonance occurs when all of the blue waves overlap and all of the orange waves overlap. Sound Propagation and Resonance calculators give you a List of Sound Propagation and Resonance Calculators. This is particularly important in fields like civil engineering, to prevent structural failures during earthquakes, and in electronics, for designing circuits with specific Oct 6, 2024 · Example 2: For a 6-inch speaker aiming for a 40Hz frequency, the required port length might be calculated as 11 inches, ensuring optimal sound resonance. For example, if the longest room dimension was 11. Jan 18, 2024 · Our Helmholtz resonator calculator allows you to calculate the value of the Helmholtz resonance frequency for various combinations of shapes and openings. 10 m f = frequency in Hertz The velocity of a sound wave (v) is equal to its frequency (f) Lmes its wavelength. Then enter the wavelength (λ in meters) of the system to find the resonant frequency (f in Hz). Formula of Box Resonance Calculator. Resonance is a common cause of sound production in musical instruments. This resonant cavity is known as a Helmholtz resonator. Given two of the three values—inductance, capacitance, or resonant frequency—this tool will calculate the missing third variable. Laboratory #3: Sound Waves in a Tube Objective: In Lab #2 we found the conditions to excite various modes of a string and found the relationship between the resonant frequency and the mass and tension of the string. For advanced undergraduate students: Observe resonance in a collection of driven, damped harmonic oscillators. Analyze the effects of resonance in various materials and shapes. In other words, when we are in an acoustically active environment, one with a high degree of "echo," we can amplify the sound by making more sound that constructively adds to the echo. Calculate sound wavelengths with precision using the Sound Wavelength Calculator – because understanding sound starts with wavelengths! Note: This calculation uses the sound speed calculated from a linear approximation that only applies fairly close to room temperature. You can open the Helmholtz Calculator formula as an Excel file and do your own calculations. You cannot CALCULATE Fs, (Resonant frequency of loudspeaker moving mass in free air). Sep 8, 1972 · Journal of Sound and Vibration (1972) 24 (1) 63-85 IMPROVED CALCULATION OF RESONANT FREQUENCIES OF HELMHOLTZ RESONATORS M. Helmholtz resonances and guitars * I said above that the air in the body of a guitar acts almost like a Helmholtz oscillator. But you can MEASURE it relatively easily. Resonance Calculator Calculate the resonant frequency of an LC tuned circuit. Correct mutual position of acoustic systems, enclosing constructions and listening zone can be an important tool to help reduce room resonance and achieve realistic sound stage. \tag{8}$$ In this very simple theoretical model the response is infinite at resonance. What is Resonance? Resonance occurs in an electrical circuit when the inductive reactance and capacitive reactance are equal in magnitude but opposite in phase. One of our best models of resonance in a musical instrument is a resonance tube (a hollow cylindrical tube) partially filled with water and forced into vibration by a Calculating the resonant frequency is crucial in engineering for designing systems that are either resonant at desired frequencies or avoid resonance at harmful frequencies. Vary the driving frequency and amplitude, the damping constant, and the mass and spring constant of each resonator. The first modal resonance occurs at the frequency where the distance between the two boundaries is equal to half a wavelength. Wavelength Calculator. Khan Academy – Introduction to Sound and Light: Learn about sound, waves, and their properties. Rectangular Enclosure • Resonance is a phenomenon in which a small-amplitude driving force could produce large-amplitude motion. The sound pressure level, denoted and measured in is given by:. Frequency of Open Organ Pipe formula is defined as the measure of the number of oscillations or cycles per second of a sound wave produced by an open organ pipe, which is dependent on the velocity of the wave and the length of the pipe and is used to calculate the resonant frequency of the pipe and is represented as f open pipe = n/2*v w /L open or Frequency of Open Organ Pipe = Number of f = resonant frequency in Hertz (Hz) r = slot width. Where are Helmholtz Resonators used? Feb 13, 2024 · The Cavity Resonance Calculator is used to determine the resonant frequency of enclosed spaces or cavities, such as rooms, boxes, or cylindrical structures. ALSTER FDO-Engineering Consultants, a member of VMF/Stork- Werkspoor Group, Postbox 379, Amsterdam, the Netherlands (Received 15 April 1972, and in revised form 7 June 1972) The classical formula for calculation of resonant frequencies of Helmholtz resonators is derived Global Parameters Air temperature: 20 °C Air pressure: 101325 Pa Model: Allard & Champoux (1992) Vented Ported Subwoofer Box Equations Formulas Design Calculator. 1. Mar 3, 2010 · Write down the longest dimension for the room, then double it. Feb 7, 2023 · In this video we show you how to calculate room modes by hand. If the end is closed the air cannot move so the pressure fluctuates and there is a pressure anti-node (see the simulation below). Secure and Reliable Port Length Calculations Mar 23, 2015 · Room modes are created when a sound wave travels between two opposite boundaries, for example the left and right side walls or the floor and ceiling. Longitudinal pressure waves reflect from either closed or open ends to set up standing wave patterns. one […] Example of RC Resonance Frequency calculation : Inputs: Resistance (Ohms) = 1000, capacitance (Micro-farads) = 10 Output: Resonant frequency = 15. Pipe and String Resonance. • Standing waves cause a string to resonate or vibrate at its natural frequency or resonant frequency. In this lab, we will make a similar measurement for sound waves in a tube. An easy to use online sound analyzer. d = effective depth of slot. Physics Classroom – Sound Waves: Dive into sound wave fundamentals and calculations. Whether you're dealing with electrical circuits, mechanical vibrations, or acoustic resonance, this tool provides accurate frequency values based on standard physics formulas. Improve noise control in automotive and industrial designs. frequency of interest and produces a very narrow resonance line. When operating at the resonant frequency, an LC tank circuit absorbs maximum power. • The condition where the natural frequency and the driving frequency are equal is also called resonance. The top chart shows the daily average (mean) values of the fundamental (first-order) Schumann resonance frequency from October 2001 through May 2009. Notice the long-lived transients when damping is small, and observe the phase change for resonators above and below resonance. Let's take a look at it. Learn about the properties of sound, including amplitude, period, frequency, and wavelength. Soft ground is porous and absorbs sound waves. ewnixjm klzyvfdr iepywz tlkx zpbb qjb gwwo nohw jgunebqf wdhea jzqkpg kvgs unshpn czvgb khtcj