PONTAULT COMBAULT, 77340, FrancePackaged Softwarewww.whmsoft.com
WhmSoftvlrPhone, vlrFilter and vlrMemos Projects.HD Voice at Low Bitrate.Project of very low consumption, radiation and bitrate softphones, with the support of the spatial audio, of the frequency shifts and of the ultrasonic communications.WhmSoft is a very small company with little business so far.His manager wants to raise funds to develop business around a high performance, high quality and low bitrate audio codec (audio compression and decompression method), based on FFT (Fast Fourier Transform).There are few months of development in order to sell the licenses of the codec in the last quarter of 2017.The main characteristics of the codec are:- HD Voice at low bitrate.- Very low consumption and radiation audio codec for smartphones and connected objects.- Support of the frequency shifts, the pitch shifts and the equalization (hearing loss correction).- Support of the ultrasonic communications.- Support of the GPU (Graphics Processing Unit).There will be an increase in the capital to start commercial activities:- By converting a part of the contributions of the founder.- By opening the capital.
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vlrPhone is an app based on PJSIP and Open Source products, whose goal is to promote, in the future versions, a new codec (compression and decompression method) for the audio and the ultrasounds.This codec is based on FFT (Fast Fourier Transform), the greatest points and the most energetic bands. It can also use only the local peaks.This codec is characterized by its efficiency, its simplicity and its robustness.It will allow low battery consumption (VLC, Very Low Consumption, yellow button) and emissions of audio frames limited to the strict minimum, so the electro-magnetic radiations will be minimized (VLR, Very Low Radiation, green button).It will allow, in real-time, the frequency shifts, the pitch shifts and the equalization for the correction of hearing losses.It will allow also to do local or near-field ultrasonic communications, so with no radiations.If the correspondent does not use vlrPhone, the app behaves as a normal softphone.More details on the app website.
The ultrasounds are commonly used in many areas, including in the medical imaging, the motion or presence detection, the leak detection and the distance measurements (the ultrasonic radars).In recent years, their importance has become growing in the field of the local or near field communications, in particular, thanks to the development of the Internet of Things (IoT).VlrPhone uses a codec (or rather a family of codecs) compatible with the ultrasounds.These codecs can take the ultrasounds into account in three ways:- By increasing the useful audio band. Beyond 20 kHz, the sounds become inaudible for the human ears and are called ultrasounds.- By taking into account only the areas in the ultrasound.- By performing frequency shifts towards the ultrasounds.The VLC method is patented in France and is being studied in the U.S. (USPTO).The VLR method is being studied in France (INPI).More details can be found on the app website.
With the vlrphone project, we will propose receivers for the surveillance and the detection, using the ultrasounds, for use alone or with a classic video camera.These receivers will record the ultrasounds using the VLC and VLR codecs algorithms.There will be up to ten (10) receivers in the general case, and up to thirty two (32) receivers in option.We will consider the sampling rates of 48 and 96 kHz in the general case, 192 and 384 kHz in option.The receivers will be compatible with the projects using the Doppler effect (frequency changes when the distance transmitter - receiver varies over the time), and the projects using the amplitude variations (the receiver is more or less close to the transmitter).The obtained bitrates will be compatible with certain low bitrate networks for connected objects, such as the LoRa network (Low Range).These networks, which are also low consumption networks, are called LPWAN (Low Power Wide Area Network).More details on the app website.
The ultrasounds transmitted by the bones are also called BCU, or Bone-Conducted Ultrasound.The Scientists have long known of the ability to hear ultrasonic frequencies (between 20 and 100 kHz).The ultrasounds are audible by the bone conduction. Some deeply deaf subjects (including sensory deafness) as well as subjects with normal hearing can hear and understand BCU whose amplitude is modulated by the voice.With the AM-BCU or amplitude-modulated BCU, the voice and the music can be heard and understood if the signal is correctly shifted (towards the high frequencies and the ultrasound) and transmitted to the body.This shift can be performed instantly by the vlrPhone software just before decompression.The vrlPhone software will offer this feature for the 48 and 96 kHz sampling rates.The user will be able to choose the frequency of the carrier. The modulated signal will to be transmitted to bone conduction systems having an adequate bandwidth.More details on the app website.
The bone conduction headphones do not pass through the outer ear or through the middle ear, and therefore are not sensitive to the spectral filters due to these organs.Spectral filters are responsible in particular of the elevation localization.With vlrPhone, we will be able to use customized HRTF (Head-Related Transfer Function) filters, usable with the bone conduction headphones, in binaural listening.The HRTF filters will be applied just before decompression and can be changed dynamically (e.g. to take into account of the head movement).The HRTF filters can be used to place an audio source at a given position.They can also be used to create virtual speakers around the user for a binaural listening via stereo headphones.The bone conduction headphones leave the ears in the open air.Since the ears have a 3D spatial perception of the sound, it is important to be able to personalize the sound perception with the bone conduction headphones.More details on the app website.
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