heart sound effects Asbjoern Andersen


The Stanford Virtual Heart is a VR experience that helps medical students and parents understand the most common congenital heart defects. In this interview, hear from Ana Monte, Co-founder of DELTA Soundworks, about how she and her fellow co-founder, Daniel Deboy, got involved with such an interesting project and met its needs for immersion and accuracy.
Written by Adriane Kuzminski. Images courtesy of DELTA Soundworks, David Sarno, and David Axelrod MD.
Please share:
SoundMorph Halloween Sale 2025


The Stanford Virtual Heart - Lucile Packard Children’s Hospital Stanford


Hello, Ana! I’m so happy to speak with you again. I heard you are working on an exciting new project called The Stanford Virtual Heart. Could you tell us a little about it?

Ana Monte (AM): Hi Adriane, thanks for reaching out again!

The Stanford Virtual Heart, an initiative at Lucile Packard Children’s Hospital Stanford, is an exciting VR experience breaking new ground in medical education. In this experience the virtual heart beats, pumps blood, and allows medical trainees to perform surgical repairs to correct congenital defects. The experience is far more immersive and engaging than textbook images or cadavers, and allows medical trainees to explore and interact with a living, virtual body.

The experience was developed with support from Oculus VR and The Betty Irene Moore Children’s Heart Center at Stanford.

The team plans to develop a full atlas of about 25 congenital heart defects that can be used in the Stanford Medical School’s residency training and advanced fellowship training programs.

Sources: Lighthaus and Stanford Daily

 

I have to say this type of project isn’t one that comes up every day. How did you first get involved with this momentous project?

AM: We are extremely fortunate and honored to have joined this exciting project. I guess we were just at the right place at the right time. Our journey started back in 2017 when my business partner, Daniel, and I were attending a big tech trade fair in Germany called CeBIT. The fair had a VR hall and Dan and I were curious to see which new VR experiences were being presented. We had already been in touch with Lighthaus, the production company and creators of “The Stanford Virtual Heart” and set up a meeting. We put on the HMD (head-mounted display, aka Oculus Rift) and were blown away. The experience was quite impressive and let’s be honest, only VR can transport you to the inside of a heart!

Little did we know, sound is an extremely important tool for diagnosing congenital heart defects

However, we noticed a big detail missing in the experience: there was no sound! This is when Dan and I offered our sound expertise to the project. Not having the medical background, we mostly had UI sounds in mind and maybe a basic heartbeat sound… Little did we know, sound is an extremely important tool for diagnosing congenital heart defects and a crucial part of a medical student’s training!

A man wears headphones and a woman wears a VR device

Photo by Anna Logue. L – Daniel Deboy, R – Ana Monte

Since this tool will be used to train medical students on how to use their ears to recognize heart defects, how were the sounds of the anomalies recorded and designed to ensure the highest accuracy?

AM: Have you ever wondered what doctors listen to when using a stethoscope? They are looking for abnormal sounds coming from your body, mostly from your lungs and heart. In the case of the heart, there are two main components that doctors call lub and dub. Those sounds are caused by the heart valves closing (lub: mitral/tricuspid; dub: aortic/pulmonary) and make up the heart sound that we all know. However, depending on the congenital heart defect, the rhythm of the heart changes and some elements are added or removed.

Fun fact: doctors actually don’t know 100% if the heart sounds are caused by the valves closing. This is a speculation.

Initially, Lighthaus provided us with a database of sound recordings from each heart defect to optimize and potentially use in the experience. Unfortunately, simply “cleaning” these sound recordings was not an option since they all came from different sources and would not allow for a consistent sound quality. Also, some defects are so rare that there are only a handful of sound recordings. These recordings became, however, an excellent reference for our sound concept.

Later, our idea was to record authentic heart sounds using a DIY stethoscope mic or digital stethoscope. This way there would be a consistency in the recording quality. However, how do you find your sound source? These defects are rare and you can’t just go to a hospital and record sick children. Moreover, we knew the experience would have an “inside the heart” part, meaning separate heart components would have to be placed in a virtual space. We needed more than just one mono heartbeat sound. We also needed separate heart components to be triggered at different times in the game engine. For example, if I approach the tricuspid valve, I might want it to sound louder and maybe barely hear the mitral valve. Off to Plan C.

With the help of iZotope RX, we analyzed each heart defect frequency spectrum and decided to combine the “lub dub” sound from a real heart recording with some filtered pink noise for the “murmur” (more about the murmur later).

Kudos to doctors for having a better ear than sound engineers when it comes to hearing these differences!

For each heart defect, we received parameters from Dr. Axelrod. These parameters described one heart cycle and which events were happening within the cycle such as duration of murmur, amplitude, frequency range and occurrence of murmur in milliseconds. This gave us a visual representation of what was happening with the sound and was quite helpful, especially because if you are dealing with things in milliseconds, it’s quite difficult to hear a difference in heart components. The aortic and pulmonary valves close only within milliseconds between them. Kudos to doctors for having a better ear than sound engineers when it comes to hearing these differences!


Popular on A Sound Effect right now - article continues below:


Trending right now:

  • Cinematic & Trailer Sound Effects SpellBound Play Track 969 sounds included, 122 mins total $90

    SpellBound is premium sound effects library exploring the intersecting spaces of modern magic and science fiction energy. The result is a polished, designed, and inspiring set of cinematic magic sounds ready to bring new life to your film, game, and media projects. Brian Johnson, the creator of SpellBound and Slipstream is an award winning sound designer who after working in film, and television, has found his home designing sound for the biggest video game franchises in the world.

    SpellBound has 969 total sound effects
    Spells, explos, tails, whooshes, beds, impacts, drones, and more.

    Designed section – 202 designed multi-event show stopping full frequency sound effects.
    Elements section – 767 designed construction kit, layers, sweeteners, and single event effects.

    SpellBound can compliment your fx arsenal with traditional fantasy, modern magic, cinematic impacts, and even as an explosion sweetener. It can take over a fantasy trailer or a compliment a hybrid space magic video game.

    Thank you for licensing SpellBound. I hope it inspires you to create something exciting and magical.

    SpellBound Flyer

    28 %
    OFF
  • Characters speak and so do the items they use. USER INTERFACE will bring the small to life with this collection of clicks, notifications, buttons, and swooshes.

    Included are: Buttons, Clicks, Jingles, Notifications, Organics, Slides, Swishes

  • Environments & Ambiences Suburban Russia Play Track 56 sounds included, 173 mins total $19

    What could be better than summertime in the country?

    Of course summertime in Russian village!

    Those sweet sounds of hammers, lawnmowers, dogs, neighbors activity, forests, fields, rain and, of course, lots of cicadas!

    This library contains authentic atmospheres of villages and small towns of suburban Moscow, as well as sounds of nature, roomtones and doors of the old Dacha from Soviet era.

    KEY POINTS:

    • Authentic atmospheres of dacha, forests, fields, streams, rains, streets of small towns, night and day suburban activity and roomtones!

    • An excellent addition to your library for film, TV and multimedia – Suburban Russia during summer and autumn time

    • Recorded with Mid-Side Sennheiser MKH8040/MKH30 combo

    • Sorted by location-type categories

    • All files have metadata included

  • Introducing MOTION GRAPHICS, a complete Motion Graphics sound effects library from SoundMorph!

    Motion Graphics focuses on all the elements you might need for sound design on a trailer, a cinematic scene or a visual that is heavy with motion graphics, whether it be abstract or straight forward, Motion Graphics has all the elements and textures you could think of. Motion Graphics are something all of us sound designers run into at one point or another, so this library is an excellent addition to your sound effects tool box.

    Motion Graphics was created by and in collaboration with sound designer Rostislav Trifonov (SoundMorph Elemental library contributor).

    Motion Graphics features 650 24bit/96 kHz .wav files, all meticulously embedded with Soundminer & Basehead metadata.

    The library features:

    • 450 + designed sound effects
    • 190 + source audio files
    • Whooshes
    • Impacts
    • Risers
    • Stingers
    • Low end and Sub Bass
    • Impulse Responses
    • Passbys
    • Textures – noise, grit, glitch
    • Ambiences
    • Buttons and Clicks
    • Mechanical Elements
    • Granular effects
    91 %
    OFF

Latest releases:

  • Metal Sound Effects Military Truck Percussion Play Track 321 sounds included, 14 mins total $10

    A US Military Truck is transformed into a percussive instrument and hit with drum sticks and a variety of mallets ( gong, xylophone and timpani ) and sampled using contact microphones and geophones.

    A unique collection of 321 metallic percussive hits perfect for metal impact sound design and transient shaping.

    Type : Source Files / WAV Mono

    Normalised : -6 dbFS

    Grouped Files for Easy Reference Included

    Recorder : Sound Devices Mix Pre 10II

    Microphones : Stille & Klang Spot, LOM Geofon

    https://www.youtube.com/watch?v=O805cKU_XrE

    33 %
    OFF
  • All files are recorded 32bit, 192 kHz, with RØDE NTG1, Line Audio Omni1 and FEL Clippy XLR EM272 microphones, Sound Devices MixPre-6 II recorder. Library contains wav files of driving, interior and exterior foley, mechanical and electrical sounds. It is only available in UCS.

  • Effective Trailer Booms Vol. 2 delivers the next level in cinematic low-end, featuring 232 brand-new one-shot sounds meticulously designed for cutting-edge trailers.

    Building on the original Vol. 1, this new collection is designed for cutting-edge trailers. It moves beyond simple impacts to focus on the deep sub-bass, tonal rumbles, and resonant elements that build anticipation. It’s the perfect tool for setting a dark, mysterious tone at the beginning of a trailer or providing that final, deep punctuation at the end.

    A boom isn’t just a hit, it’s the sound of intrigue. Effective Trailer Booms Vol. 2 delivers the next level in cinematic low-end, featuring 232 brand-new one-shot sounds meticulously designed for cutting-edge trailers.

    Building on the original Vol. 1, this new collection is designed for cutting-edge trailers. It moves beyond simple impacts to focus on the deep sub-bass, tonal rumbles, and resonant elements that build anticipation. It’s the perfect tool for setting a dark, mysterious tone at the beginning of a trailer or providing that final, deep punctuation at the end.

    Inside, you’ll find a massive library of deep tonal rumbles, powerful sub-bass swells, bone-chilling textures, dark resonant drones, and powerful cinematic punctuation, all designed to pull the audience in.

    40 %
    OFF
  • Cinematic & Trailer Sound Effects SpellBound Play Track 969 sounds included, 122 mins total $90

    SpellBound is premium sound effects library exploring the intersecting spaces of modern magic and science fiction energy. The result is a polished, designed, and inspiring set of cinematic magic sounds ready to bring new life to your film, game, and media projects. Brian Johnson, the creator of SpellBound and Slipstream is an award winning sound designer who after working in film, and television, has found his home designing sound for the biggest video game franchises in the world.

    SpellBound has 969 total sound effects
    Spells, explos, tails, whooshes, beds, impacts, drones, and more.

    Designed section – 202 designed multi-event show stopping full frequency sound effects.
    Elements section – 767 designed construction kit, layers, sweeteners, and single event effects.

    SpellBound can compliment your fx arsenal with traditional fantasy, modern magic, cinematic impacts, and even as an explosion sweetener. It can take over a fantasy trailer or a compliment a hybrid space magic video game.

    Thank you for licensing SpellBound. I hope it inspires you to create something exciting and magical.

    SpellBound Flyer

    28 %
    OFF
  • Kawaii UI Bundle is the ultimate bundle for cute user interface sounds.
    In this Bundle you get both volumes of our Kawaii UI libraries.
    Kawaii UI + Kawaii UI 2

    These libraries provide an adorable blend of cute, satisfying interface sounds, crafted to enhance user experience and feedback.
    Bring your games and apps to life with the Kawaii UI Bundle.

    It’s ideal for creating joyful menus, delightful HUDs, playful navigation and notifications, engaging pop-ups, and expressive text.

    Kawaii UI Trailer
    Kawaii UI 2 Trailer

    The source recordings inside are a treasure trove of physical button presses, clicks, pops, taps, mouth sounds, toks, shakers, general synthesised UI sounds, FM bells and telemetry style sounds.. Kawaii UI Bundle provides you with the essential building blocks to craft your own distinctive designs.  Combining these elements gives sound designers a robust sonic palette to create new UI sounds.

    13 %
    OFF
Need specific sound effects? Try a search below:


How did the sounds of the heart defects differ from one another?

AM: Let’s look at the VSD (Ventricular Septal Defect) for example – the most common heart defect. In this case, the heart has a hole between the left and right ventricle. The blood travelling through this hole causes a sound called a “murmur”, resulting in a quite unique heart sound, almost like a steam engine or garden hose. In this case, we had to design the “lub”, “dub” and “murmur” separately to be able to position them spatially inside the heart.

VSD SOUND:

The HLHS (Hypoplastic Left Heart Syndrome), on the other hand, is missing a component: the mitral valve. This heart has an underdeveloped left side of the heart. In this case, the heart has a different rhythm, which was reconstructed using the data provided to us.

HLHS SOUND:

 

Since students can explore how each component of the heart works and even go inside the heart to see the effects of an anomaly, how did you approach designing the external and internal soundscapes?

AM: The VR experience is divided into two parts. Part one is the outside of the heart; here you can see a “library” of congenital heart defects and can pick up a heart with your controller. This external POV has a more realistic approach to it, using medically accurate heart sounds to facilitate the learning process. For this part of the experience, the user hears a single mono sound that was recreated to simulate what they would hear coming from a stethoscope. Some specific heart defects sound different depending on the stethoscope position and students must know where exactly to position it (on the front, on the back, on the rib cage, etc.).

The sounds of the heart’s components are spatially placed in their appropriate location and an “inside the body“ atmosphere is used to “glue” the sound field together

The second part of the experience, which is the internal POV, uses a more “cinematic” and “larger than life” approach to the heart sound. The sounds of the heart’s components are spatially placed in their appropriate location and an “inside the body“ atmosphere is used to “glue” the sound field together, creating an immersive sound experience. With the help of spatial audio, when the user is standing in the right ventricle, she can hear the “lub” coming from the tricuspid valve and the “dub” coming from the pulmonary valve.

David Sarno and David M. Axelrod MD

L – David Sarno (founder of Lighthaus), R – David Axelrod MD (lead medical consultant)

What 3D audio tools did you use in Unity to implement and spatialize the audio?

Initially, we had a hard time locating the murmur, as it was blending too much with the “body atmosphere”, so we added some high-frequency information to facilitate localization.

AM: In Unity, Daniel used the Google VR SDK, but most importantly, we kept in mind the rules of HRTF and psychoacoustics. It’s dangerous to only rely on your SDK or plugin to do the 3D trick, so we made sure there was a slight frequency variation on the “lub” and “dub” and there was enough high-frequency information on the “murmur” to facility the HRTF effect. Initially, we had a hard time locating the murmur, as it was blending too much with the “body atmosphere”, so we added some high-frequency information to facilitate localization.

 

What was your biggest challenge working on this project?

AM: The hardest part was initially learning about all the heart defects. I didn’t want to just design something as I go and “hope it works”, I wanted to truly understand each defect and what is happening on the physiological level. I spent a lot of time researching the problems, analysing the sounds, their frequency spectrum and their rhythm. Dr. Axelrod was amazing at providing us the source material we needed to understand things better. We Skyped a lot throughout the process and every meeting brought us closer to understanding each defect.

As a sound designer, it was also difficult to step out of that “this needs to sound like Hollywood”.

As a sound designer, it was also difficult to step out of that “this needs to sound like Hollywood”. This is an educational app, so medical accuracy was extremely important. And if you listen to a thousand stethoscope recordings like I did, they are not pretty. These are flat sounding sounds. But that’s ok. That’s how they sound and that’s how the reproduced version had to sound like.

Last but not least, we had to keep in mind how spatial audio works and how our ear localizes sounds. We initially created the murmur to have the same frequency range as an original murmur, but that was causing problems once we went inside the heart. Having a mid-range frequency range made it hard to localize and was conflicting with the frequencies of the “inside the body” atmosphere, so we cheated a bit with psychoacoustics and made the murmur sound a little more high pitched and with more high-end information.

 

Do you have any advice for other sound designers who are looking to work on serious games and academic apps?

AM: I would tell people to “just do it” :D Dan and I won an award for startups in Germany and their motto is “mach einfach” which translated means “just do it”. We wouldn’t have gotten the Stanford project if we didn’t just go up to the guys and ask if they needed sound for their app.

 

Thanks for sharing such an interesting project and your experiences with us! Where can people learn more about The Stanford Virtual Heart and DELTA Soundworks and follow you on social media?

Here’s the DELTA Soundworks website + our accounts on Twitter, Instagram and Facebook

Here’s the Lighthaus website + their accounts on Twitter and Facebook

 

A big thanks to Ana Monte for giving us a look at the sound of The Stanford Virtual Heart – and to Adriane Kuzminski for the interview!

 

Please share this:


 



 
 
THE WORLD’S EASIEST WAY TO GET INDEPENDENT SOUND EFFECTS:
 
A Sound Effect gives you easy access to an absolutely huge sound effects catalog from a myriad of independent sound creators, all covered by one license agreement - a few highlights:

  • Cinematic & Trailer Sound Effects SpellBound Play Track 969 sounds included, 122 mins total $90

    SpellBound is premium sound effects library exploring the intersecting spaces of modern magic and science fiction energy. The result is a polished, designed, and inspiring set of cinematic magic sounds ready to bring new life to your film, game, and media projects. Brian Johnson, the creator of SpellBound and Slipstream is an award winning sound designer who after working in film, and television, has found his home designing sound for the biggest video game franchises in the world.

    SpellBound has 969 total sound effects
    Spells, explos, tails, whooshes, beds, impacts, drones, and more.

    Designed section – 202 designed multi-event show stopping full frequency sound effects.
    Elements section – 767 designed construction kit, layers, sweeteners, and single event effects.

    SpellBound can compliment your fx arsenal with traditional fantasy, modern magic, cinematic impacts, and even as an explosion sweetener. It can take over a fantasy trailer or a compliment a hybrid space magic video game.

    Thank you for licensing SpellBound. I hope it inspires you to create something exciting and magical.

    SpellBound Flyer

    28 %
    OFF
  • Kawaii UI Bundle is the ultimate bundle for cute user interface sounds.
    In this Bundle you get both volumes of our Kawaii UI libraries.
    Kawaii UI + Kawaii UI 2

    These libraries provide an adorable blend of cute, satisfying interface sounds, crafted to enhance user experience and feedback.
    Bring your games and apps to life with the Kawaii UI Bundle.

    It’s ideal for creating joyful menus, delightful HUDs, playful navigation and notifications, engaging pop-ups, and expressive text.

    Kawaii UI Trailer
    Kawaii UI 2 Trailer

    The source recordings inside are a treasure trove of physical button presses, clicks, pops, taps, mouth sounds, toks, shakers, general synthesised UI sounds, FM bells and telemetry style sounds.. Kawaii UI Bundle provides you with the essential building blocks to craft your own distinctive designs.  Combining these elements gives sound designers a robust sonic palette to create new UI sounds.

    13 %
    OFF
  • Environments & Ambiences Suburban Russia Play Track 56 sounds included, 173 mins total $19

    What could be better than summertime in the country?

    Of course summertime in Russian village!

    Those sweet sounds of hammers, lawnmowers, dogs, neighbors activity, forests, fields, rain and, of course, lots of cicadas!

    This library contains authentic atmospheres of villages and small towns of suburban Moscow, as well as sounds of nature, roomtones and doors of the old Dacha from Soviet era.

    KEY POINTS:

    • Authentic atmospheres of dacha, forests, fields, streams, rains, streets of small towns, night and day suburban activity and roomtones!

    • An excellent addition to your library for film, TV and multimedia – Suburban Russia during summer and autumn time

    • Recorded with Mid-Side Sennheiser MKH8040/MKH30 combo

    • Sorted by location-type categories

    • All files have metadata included

Explore the full, unique collection here

Latest sound effects libraries:
 
  • Metal Sound Effects Military Truck Percussion Play Track 321 sounds included, 14 mins total $10

    A US Military Truck is transformed into a percussive instrument and hit with drum sticks and a variety of mallets ( gong, xylophone and timpani ) and sampled using contact microphones and geophones.

    A unique collection of 321 metallic percussive hits perfect for metal impact sound design and transient shaping.

    Type : Source Files / WAV Mono

    Normalised : -6 dbFS

    Grouped Files for Easy Reference Included

    Recorder : Sound Devices Mix Pre 10II

    Microphones : Stille & Klang Spot, LOM Geofon

    https://www.youtube.com/watch?v=O805cKU_XrE

    33 %
    OFF
  • All files are recorded 32bit, 192 kHz, with RØDE NTG1, Line Audio Omni1 and FEL Clippy XLR EM272 microphones, Sound Devices MixPre-6 II recorder. Library contains wav files of driving, interior and exterior foley, mechanical and electrical sounds. It is only available in UCS.

  • Effective Trailer Booms Vol. 2 delivers the next level in cinematic low-end, featuring 232 brand-new one-shot sounds meticulously designed for cutting-edge trailers.

    Building on the original Vol. 1, this new collection is designed for cutting-edge trailers. It moves beyond simple impacts to focus on the deep sub-bass, tonal rumbles, and resonant elements that build anticipation. It’s the perfect tool for setting a dark, mysterious tone at the beginning of a trailer or providing that final, deep punctuation at the end.

    A boom isn’t just a hit, it’s the sound of intrigue. Effective Trailer Booms Vol. 2 delivers the next level in cinematic low-end, featuring 232 brand-new one-shot sounds meticulously designed for cutting-edge trailers.

    Building on the original Vol. 1, this new collection is designed for cutting-edge trailers. It moves beyond simple impacts to focus on the deep sub-bass, tonal rumbles, and resonant elements that build anticipation. It’s the perfect tool for setting a dark, mysterious tone at the beginning of a trailer or providing that final, deep punctuation at the end.

    Inside, you’ll find a massive library of deep tonal rumbles, powerful sub-bass swells, bone-chilling textures, dark resonant drones, and powerful cinematic punctuation, all designed to pull the audience in.

    40 %
    OFF
  • Cinematic & Trailer Sound Effects SpellBound Play Track 969 sounds included, 122 mins total $90

    SpellBound is premium sound effects library exploring the intersecting spaces of modern magic and science fiction energy. The result is a polished, designed, and inspiring set of cinematic magic sounds ready to bring new life to your film, game, and media projects. Brian Johnson, the creator of SpellBound and Slipstream is an award winning sound designer who after working in film, and television, has found his home designing sound for the biggest video game franchises in the world.

    SpellBound has 969 total sound effects
    Spells, explos, tails, whooshes, beds, impacts, drones, and more.

    Designed section – 202 designed multi-event show stopping full frequency sound effects.
    Elements section – 767 designed construction kit, layers, sweeteners, and single event effects.

    SpellBound can compliment your fx arsenal with traditional fantasy, modern magic, cinematic impacts, and even as an explosion sweetener. It can take over a fantasy trailer or a compliment a hybrid space magic video game.

    Thank you for licensing SpellBound. I hope it inspires you to create something exciting and magical.

    SpellBound Flyer

    28 %
    OFF
  • Kawaii UI Bundle is the ultimate bundle for cute user interface sounds.
    In this Bundle you get both volumes of our Kawaii UI libraries.
    Kawaii UI + Kawaii UI 2

    These libraries provide an adorable blend of cute, satisfying interface sounds, crafted to enhance user experience and feedback.
    Bring your games and apps to life with the Kawaii UI Bundle.

    It’s ideal for creating joyful menus, delightful HUDs, playful navigation and notifications, engaging pop-ups, and expressive text.

    Kawaii UI Trailer
    Kawaii UI 2 Trailer

    The source recordings inside are a treasure trove of physical button presses, clicks, pops, taps, mouth sounds, toks, shakers, general synthesised UI sounds, FM bells and telemetry style sounds.. Kawaii UI Bundle provides you with the essential building blocks to craft your own distinctive designs.  Combining these elements gives sound designers a robust sonic palette to create new UI sounds.

    13 %
    OFF

   

Leave a Reply

Your email address will not be published. Required fields are marked *

HTML tags are not allowed.