In the extend range mode (20 – 1000 Hz), the ambient/background noise is higher than that in other modes such as bell mode. There are three reasons:
- At extend range, the sounds picked by the Stemoscope have a wider frequency range, so when the Stemoscope picks up more signals, it also picks up more noise.
- The noise at the higher frequency range (200 – 1000 Hz) is more audible than that at the lower frequency range (20 – 200 Hz) because our ears are more sensitive to the high frequency sounds.
- When the audio signals are amplified, the noise too. If you lower the volume level to the level close to that of a traditional stethoscope, the ambient noise is less audible. Actually the ambient noise level of Stemoscope is similar to that of a traditional stethoscope. However, the digital amplification of the Stemoscope amplifies the noise and make you feel the noise level is higher.
In the heart theme/page of the Stemoscope App, choose the bell mode (20-200Hz), and then put the Stemoscope over your heart for at least 8 seconds. The App may start to display heart rate. It can only display heart rate for regular heart rhythm.
You can output the audio from the audio jack of your phone that runs the Stemoscope App to a computer or another phone that runs a software/app that supports live stream or share, such as Skype.
Yes. Stemoscope supports Bluetooth hearing aids. Stemoscope transmits the audio signals to your phone and your phone transmits the process audio signals to your Bluetooth hearing aids, both via Bluetooth, so you can hear the sounds in real time. Your phone works as a streamer.
Here is how you can simply decide whether your Bluetooth hearing aids are supported. Do your Bluetooth hearing aids connect to your phone to listen to music or answer calls? If yes, you can hear the Stemoscope sounds in the same way because you can use your Bluetooth hearing aids to hear the sounds from the phone.
If you are using an iPhone/iPad, please make sure the Bluetooth of your phone is turned on, your Stemoscope is charged and check if your Stemoscope can connect to the App. If not, please do the following:
- Open the “Stemoscope” App and turn on the Stemoscope, please remember the Stemoscope light status: fading in and out, blinking or consistently on.
- Enter “settings” ->”Search Stemoscope Devices” in the App and run a search. After the search is completed, please take a picture of the screen.
- Take a photo of the QR code on your Stemoscope device.
Please email the light status of 1, the picture of 2, and the photo of 3 to us and we will come back to you within 24 hours normally.
If you are using an Android phone, please make sure a. the Bluetooth of your phone is turned on, b. your Stemoscope is charged, c. the “Location” service in your phone system settings is turned on, d. the “high accuracy” or “GPS” under the “Location” service in your phone system settings is turned on, e. you grant the Stemoscope App the right to use Bluetooth, and f. you grant the Stemoscope App the right to access the location. Please be noted that c, d, and f are required by the Android system to enable Bluetooth scanning, the Stemoscope doesn’t read or save your location information. Though d is only required by some Android phone models, make sure d is on to identify the root cause of non-connecting. Then check if your Stemoscope can connect to the App. If not, please do the following:
- Take a photo of the QR code on your Stemoscope device.
No. Stemoscope doesn’t support Bluetooth pairing, so please do not try to pair it in the system settings of your phone. Stemoscope doesn’t require Bluetooth pairing to work. It is different from a Bluetooth earphones or a Bluetooth speaker.
No. The diaphragm can’t be removed. The diaphragm, together with the chamber, amplifies the sounds. If you remove it, you may hear very low volume or even no body sounds.
Generally, the bell mode (20-200 Hz) is good for listening to heartbeats which are mainly made of very low frequency sounds. The diaphragm mode (100-500 Hz) is good for listening to breath sounds because the heartbeats sounds are weaken in this mode. If you use the bell mode (20-200 Hz) to listen to the breath sounds, some breath sounds with a frequency higher than 200 Hz could be filtered off. With frequency range increasing, more ambient sounds can be heard through the Stemoscope.
When your Stemoscope is working, use your finger to tap/knock the diaphragm. If you can hear a loud dub sound with your earphones and high volume when you tap/knock, the Stemoscope works well. Heart sounds are easy to be detected. You may listen to your heartbeats. If you can hear your heartbeats clearly, your Stemoscope works well. Please don’t forget to wear your earphones and increase your phone volume if necessary.
Since most sounds sensed by Stemoscope have a very low frequency, earphones favoring bass sounds (low frequency sounds or low pitch sounds) are preferred.
For Bluetooth earphones, we recommend Apple Airpods Pro, or any other TWS earphones with noise cancelling.
Most headphones that generally cover the ears perform very well.
While for general wired earphones, the original earphones coming with the iPhones or Samsung phones also perform well.
When you hold the Stemoscope on an object you want to listen, there can be multiple sources of noise. One source is from the non-stable hand. You may try to hold the Stemoscope as stable as possible and avoid friction between the Stemoscope and the object surface. Another option is to use a strap accessary, which can totally remove such friction induced noise.
You can open the Stemoscope App and tap “settings” on the home screen. In settings, tap “Device management”. You can find “Add a new stemoscope”, and then you can add a new Stemoscope the same as the first one you added.
You can use your registered email address to retrieve the QR codes of all the Stemocopes you have registered. Please use this email address to send an email to email@example.com, and tell us that your QR code is broken. We will email the QR code to your email address.
A stable Bluetooth working distance depends on a lot of factors such as the environment and your phone. In a “busy” wireless environment where there are many phones and WIFI devices, the Bluetooth connection could be interfered. Our recommended working distance is 2 meter, within which Stemoscope normally works well based on our test. For the best Bluetooth performance, you may minimize the distance between your phone and Stemoscope and minimize the obstacles between them.
The loudness or the volume is determined by several factors. Firstly, the source of the sounds can be weak, depending on what you are listening to. Secondly, different phones have different audio output power level. For example, an iPod touch outputs higher power level than an iPhone. Thirdly, the performance of earphones varies quite a lot. You may try a headphone for better performance.
Human ears have different sensitity to different audio frequency. This is generally described by a hearing curve. In generally, human ears are less sensitive to very low frequency (pitch) sounds. With the same power level (Phone volume level), we feel the low frequency sounds are less loud. We may increase the phone volume to feel the low frequency sounds are loud enough and when we do not use Stemoscope adjust the phone volume to the orignal level.
Human body sounds are most times full of bass (low pitch or low frequency) elements. The builtin speaker in a phone is generally not good at playing these bass sounds. Earphones performs much better than builtin speakers.
Firstly, you need to give the Stemoscope App access to your phone camera to read the QR code. Secondly, you may try different light environment and shoot angles. Thirdly, you may unscrew the diaphragm cover and put the diaphragm on a white background such as a white paper to shoot the QR code. If you still the App still can’t scan the QR code, don’t worry and you can take a clear picture of the QR code and email us. We will generate an electronic version for you.