LEBRUN , Jerome

In this paper, we detail our on-going browser-based re-creation of a famous tube guitar amplifier and describe the JavaScript implementation we have been developing using the WebAudio API. The tricky part of such an amplifier is the power stage (Power Amp) which contains a parametric negative feedback loop. We show the limits of the high-level...

In this paper are exposed our latest experiments with the WebAudio API to design different types of gears for guitarists: real-time simulations of tube guitars amplifiers, fx pedals, and their integration in a virtual pedal board. We have studied different real guitar tube amps and created an interactive Web application for experimenting,...

The physical layer(s) of wireless robotics take advantage of current standards, like Bluetooth, Wifi, etc., each of them addressing a specific segment of wireless robotics. Wireless robotics has a wide range of needs, comprising low power, robustness and high data rate when video is used as well as the opportunity to use a large number of...

International audience

This paper presents a tube guitar amplifier simulation made with the WebAudio API, that reproduces the main parts of the Marshall JCM 800 amplifier schematics. Each stage of the real amp has been recreated (preamp, tone stack, reverb, power amp and speaker simulation, and we added an extra multiband EQ). The " classic rock " amp simulation we...

We propose to present a tube guitar amplifier simulation we've been designing using the Web Audio API with the aim to faithfully reproduce the main parts of the Marshall JCM 800 amplifier schematics. Each stage of the real amp has been recreated (preamp, tone stack, reverb, power amp and speaker simulation). We've also added an extra multiband...

The ANR project WASAB will last 42 months and consists in developing a 2 million songs database with interactive WebAudio enhanced client applications 1. Client applications target composers, music schools, sound engineering schools, musicologists, music streaming services and journalists. In this paper, we present a virtual pedal board (a set...

Since 2012 and the advent of the Web Audio API, the development of computer music applications within web browsers has become feasible. Recent improvements in this API and other advancements in web browser technology have significantly expanded the possibilities for new developments. Thanks to the WebAssembly and AudioWorklets APIs, code...

In 2016, we pioneered an approach to reproduce and experiment with Web-based simulations of classical tube guitar amplifiers, initially the Marshall JCM800 used by many famous musicians (e.g. AC/DC). Our implementations run within standalone Web browsers. The different stages of the amps are perceptually approximated using simple tools from the...

Increasing need for secure voice communication is leading to new ideas for securing voice transmission. This work relates to a relatively new concept of sending encrypted speech as pseudo-speech in audio domain over existing civilian voice communication infrastructure, like 2G-4G networks and VoIP. Such a setting is more universal compared to...

International audience

This paper details a novel distortion-tolerant speech encryption scheme for securing voice communications over digital voice-specific channels such as 3G/4G or VoIP voice calls. The scheme relies on the usual "loudness, pitch and timbre" parametric representation of speech signals but seen as points on various perceptually-continuous manifolds...

To combine the high power efficiency of Continuous Phase Modulation (CPM) with either high spectral efficiency or enhanced performance in low Signal to Noise conditions, some authors have proposed to introduce CPM in a MIMO frame, by using Space Time Codes (STC). In this paper, we address the code design problem of Space Time Block Codes...

In this paper, we introduce further our recently designed family of L2 orthogonal Space-Time codes for CPM. With their advantage of maintaining both the constant envelope properties of CPM, the diversity of Space-Time codes and moreover orthogonality, and thus reduced decoding complexity, these codes are also full rate, even for more than two...

The combination of space-time coding (STC) and continuous phase modulation (CPM) is an attractive field of research because both STC and CPM bring many advantages for wireless communications. Zhang and Fitz [1] were the first to apply this idea by constructing a trellis based scheme. But for these codes the decoding effort grows exponentially...

Motivated by an increasing need for privacy-preserving voice communications, we investigate here the original idea of sending encrypted data and speech in the form of pseudo-speech signals in the audio domain. Being less constrained than military "Crypto Phones" and allowing genuine public evaluation, this approach is quite promising for public...

To combine the power efficiency of Continuous Phase Modulation (CPM) with enhanced performance in fading environments, some authors have suggested to use CPM in combination with Space-Time Codes (STC). Recently, we have proposed a CPM ST-coding scheme based on L2-orthogonality for two transmitting antennas. In this paper we extend this approach...

Non-linear modulations, like the Continuous phase modulation (CPM) with its constant envelope property, have been appealing for energy efficient communication systems. In parallel, linear orthogonal Space-Time block codes (STBC) have emerged as a simple way of achieving spectral efficiency by full diversity and simple decoupled...

The current increasing need for privacy-preserving voice communications is leading to new ideas for securing voice transmission. This paper refers to a relatively new concept of sending encrypted speech as pseudo-speech in the audio domain over digital voice communication infrastructures, like 3G cellular network and VoIP. This work presents a...

The current increasing need for privacy-preserving voice communications is leading to new ideas for securing voice transmission. This paper refers to a relatively new concept of sending encrypted data or speech as pseudo-speech in the audio domain over existing voice communication infrastructures, like 3G cellular network and Voice over IP...

International audience

We propose to present a set of web audio plugins specialized in three kinds of sounds. The first one targets blues / classic rock sounds and proposes a drop down menu with presets that go from clean warm blues like the tones used by BB King, to more classic rock/blues distorted sounds as used by Jimmy Hendrix or AC/DC. The second one is aimed...

The increasing need for secure voice communication is leading to new ideas for securing voice transmission. This work relates to a relatively new concept of sending encrypted speech as pseudo-speech in the audio domain over existing civilian voice communication infrastructure, like 2G-4G networks and VoIP. Such a setting is more universal...

International audience

Orthogonal Space-Time Block Codes (STBC) with Multiple-Input Multiple-Output (MIMO) systems have become a very popular way of adding spatial diversity to transmissions. Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique to further increase the robustness against frequency selective fading at high data rates. Some...