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Abstract: The present invention provides a sound reproduction system that calculates parameters
to be applied to a digital signal processor and applies them from a combination of presets. A
terminal (100) displays a display corresponding to a plurality of processing presets having a
predetermined processing parameter, a digital signal processor capable of applying processing
operations to an audio signal, and a processing adjustment cursor. A haptic interface (touch
screen 130) capable of receiving haptic control for continuous movement. The parameters to be
applied are calculated according to the preset parameters of the preset and the position of the
adjustment cursor with respect to different preset display positions, thereby applying the
processing obtained from the combination of the presets. [Selected figure] Figure 2
Acoustic playback system with haptic interface for equalization selection and setting
The present invention relates generally to audio systems, and more particularly to sound
reproduction setup means of such systems, in particular systems having reproduction by an
audio headset.
Some headsets include a rechargeable battery and a wireless receiver circuit, for example a radio
(typically with Bluetooth (registered trademark) specification or infrared) radio receiver circuit
such channel Are adapted to receive the audio signals conveyed by B., convert them into analog
acoustic signals to be applied to the transducer.
Most modern audio headsets also include audio processing electronics intended to perform
equalization, apply sound effects, dynamically control the volume of playback, neutralize ambient
noise, etc.
Equalization and sound effects settings are preset at the user's choice by control through an
interface located on a remote device such as a smart terminal or smart phone that communicates
with the audio headset, typically through a wireless link with the Bluetooth communication
protocol. It is selected from the list.
A headset marketed by the applicant's company under the brand name Zik® has such
US Patent Application Publication No. 2012/0063614 A1 and US Patent Application Publication
No. 2014/0173519 A1 describe such an interface for selecting and controlling various sound
reproduction presets with appropriate controls made available to the user. It is done.
The present invention aims at enriching the possibilities of settings, in particular sound
equalization settings, while allowing the user to make such settings in a particularly simple and
intuitive way.
Thus, the present invention predefines a digital signal processor capable of applying processing
operations to an audio signal to be reproduced according to parameters, as disclosed in the
above-mentioned US Patent Application Publication 2012/0063614 A1. A touch screen user
interface adapted to display at a predetermined position a display corresponding to a plurality of
processing presets having different processing parameters and to receive tactile control for
continuous movement of the processing adjustment cursor; The parameters to be applied to the
digital signal processor are calculated according to the preset predetermined parameters and the
position of the adjusting cursor with respect to the plurality of different preset display positions,
thereby obtaining the combination of the presets Allow to apply processing Suggest sound
reproduction system comprising a because of means.
As a feature of the present invention, the preset representations of this system are distributed in
two angularly offset positions by two in an area having a shape of rotation.
Furthermore, the cursor is a single cursor, and movement of this cursor radially relative to the
shape of rotation allows for adjusting the intensity of the process, and movement of this same
cursor circumferentially relative to the shape of rotation However, the position of the display is
made to allow adjusting the combination between the nearest presets.
Some preferred but non-limiting features of this system are listed below, which can be adopted in
any combination deemed technically possible by the person skilled in the art.
-The preset is a frequency band equalization preset-The parameters of the preset include the
parameters of band frequency filtering-The parameters to be applied are the distance of the
cursor to the two preset display positions which are the closest of the cursor Accordingly, the
system calculates the parameters to be applied to the digital signal processor according to the
reference position corresponding to the absence of processing and the position of the cursor
relative to the at least one closest preset display position, calculated accordingly by interpolation.
Thereby further comprising means for allowing adjustment of the processing strength, the
system comprising a smart terminal having a user interface and calculating means, and a
listening headset having a digital signal processor And / or, - the system is adapted to transmit
the audio flow and parameters, further comprising a wireless communication means between the
terminal and the headset.
Exemplary embodiments of the invention are described below with reference to the
accompanying drawings.
The same reference numerals indicate the same or functionally similar elements throughout the
FIG. 1 is a schematic representation of the various components of a sound reproduction system
for the implementation of the present invention.
FIG. 2 is a diagram illustrating a preferred user interface for implementing the present invention.
FIG. 3 is a diagram illustrating equalization values corresponding to a set of presets that may be
selected via the interface of FIG. FIG. 4 is a diagram showing response curves of filtering
operations corresponding to these equalizations. 5a-5d illustrate a series of user interfaces
(including the interface of FIG. 2) that may be used to implement a series of functionalities
associated with sound reproduction.
First, referring to FIG. 1, an audio listening system is shown comprising a user terminal 100 and
an audio headset 200.
The terminal 100 is, for example, a smart phone and comprises, in a manner known per se, a
central processing unit and its conventional memory and input / output devices, for example
wireless communication means according to the WiFi and Bluetooth protocols, and a touch
In FIG. 1, a central processing unit 110, a Bluetooth communication circuit 120 and a touch
screen 130 of a terminal 100 of a type known per se are shown briefly.
The headset 200 is of the ear wrap type and includes Bluetooth receiving circuitry 220 which, in
a conventional manner, is two left and right earphones 210g and 210d which allow one of the
earphones to communicate with the terminal 100. Apply earphones and various types of
processing (equalization, reverberation, spatialization etc) to the sound flow received by the
corresponding profile of the Bluetooth protocol (typically the A2DP profile) A digital signal
processor 230 adapted as such, and an amplifier 240 for the transducers contained in the left
and right earphones.
The adaptation profile of the Bluetooth protocol allows to transfer settings or parameter values
to be applied to the control input of the digital signal processor 230 from the terminal 100 to the
headset 200 in order to correct the applied effects.
One of the effects that can be applied by processor 230 is a frequency filter.
For example, the processor implements an infinite impulse response (IIR) filter that is
characterized by the value of the signal applied at the input and the response based on the
leading value of the response that the filter may have generated.
It may also be a second-order IIR filter, specifically called "biquad", giving the output signal y at
time n as a function of the input signal x at time n, n-1 and n-2 The transfer function is given by:
y (n) = b0 <*> x (n) + b1 <*> x (n-1) + b2 <*> x (n-2) + a1 <*> y (n-1) + a2 < *> y (n-2) transfer
function coefficients a 1, a 2, b 0, b 1, b 2 are the filter parameters f 0, Q, and G (respectively the
center frequency of the processed band, the band Derived from width or quality factor, and gain).
These coefficients or parameters themselves are adjusted in response to configuration choices
for the terminal made by the user, the method of which will be described next.
Referring to FIG. 2, the user interface according to a preferred example of the present invention
comprises an area ZA of rotation generated and fixed on the touch screen 130, which area is for
example circular or annular, here approximately It is annular and over this area it is possible to
move the smaller setting cursor in response to the sliding movement of the finger by the tactile
input interface, in this specification the cursor is the outer diameter of the annular area ZA A
circular setting tip P with a substantially smaller diameter.
In order to unambiguously distinguish the position of the chip P relative to the annular area ZA,
the chip has a color which is in sharp contrast to the color of the annular area.
For example, the area ZA is shown in gray levels while the chip P has a bright color.
Six angular positions on the area ZA, which are 60 ° apart from one another, correspond to six
frequency filtering presets.
These six preset positions are indicated by the reference signs PR 1 to PR 6, each being a word or
indicator reminiscent of a setting on the peripheral circle CP of the indicator, ie, Vocal (Cross),
Cristal (Crystal), He is responsible for the Club, the Punchy, the Deep and the Pop.
Advantageously, as shown, the annular area ZA has, in the circumferential direction, at its outer
edge and / or its inner edge, for example, an undulation which can exhibit certain filtering
According to another preferred embodiment, the inner and outer edges of the annular area are
not sharp edges but rather blurry edges, and the gray level goes white as it enters the area and as
it leaves the area Progressively shaded towards black.
As a feature of the invention, the movement of the frequency filtering tuning chip P makes it
possible to change the equalization progressively.
In response to the haptic interface, when the tip P is moved radially outward from the geometric
center C of the annular area ZA, a first degree of progression is obtained.
When this movement is performed toward a given preset PR n (in the direction of the arrow F 1
toward the chip position P 1 of the preset PR 3 Club in FIG. 2), the central apparatus of the
terminal 100 recognizes the preset PR 3. The equalization parameters to be applied to the digital
signal processor are calculated by interpolation between the zero strength of equalization
(without equalization effect) and the maximum strength of equalization.
This interpolation is preferably in frequency when the search position of the chip is reached
(typically when the user slides the chip to the desired position and then removes the user's finger
from the haptic input interface) The gain parameter for each of the bands (whether this gain
parameter is positive or negative), between 0 and 1 representing the radial distance between the
geometric center C and the center of the tip P It is done by multiplying by the included factor.
This radial distance is determined on the basis of the maximum radial distance corresponding to
the maximum intensity of the effect, which is preferably located near the outer edge of the
annular zone ZA.
In response to the haptic interface, a second degree of progression is obtained when the chip P is
moved towards a position located between the two presets PR n and PR n + 1.
When such a move is made (in FIG. 2 in the direction of the arrow F 2 towards the chip position
P 2 located between the Club and Punchy settings PR 3 and PR 4), the central device of the
terminal 100 is assigned the preset PR The equalization parameters to be applied to the digital
signal processor are calculated by interpolating between the three equalization values and the
preset PR 4 equalization values.
This interpolation may be a linear interpolation based on the angular position of the chip P
relative to the angular positions here separated by 60 ° of the two presets PR 3 and PR 4
surrounding the position P 2 of the chip.
Thus, in practice, the calculation of the parameters to be applied to the digital signal processor
takes into account both the distance between the chip P and the geometrical center C and the
angular position of said chip in the area ZA, this calculation Are obtained from i) a first
interpolation between two preset parameters (except when there is a chip P within the radius
corresponding to pure preset PR n), ii) from zero equalization and the first interpolation It will be
understood to combine the second interpolation between the parameters and
When the chip is moved to the desired position via the haptic interface and is stationary at this
position, the parameters calculated as defined above are fixed and sent to the digital signal
processor 230 of the headset 200 .
As a variant, preferably, while moving the chip P through the haptic interface, the parameters are
calculated dynamically and sent periodically to the processor 230, so that the user You can listen
to the effects of the process as adjusted.
Preferably, the presets are organized over the annular area ZA such that two angularly adjacent
presets have similar parameters, so that interpolation between the values of adjacent preset
parameters is to be of musical significance. Become.
In the present example, six presets are provided and their parameter values are shown in FIG.
These parameters herein include a set of five preset values, which generally do not fall into the
implementation details of the infinite impulse response "bike ad" filtering, from bass to treble
Corresponding to the gain values in the five frequency bands of
The "finest" equalization presets (rich in the highs and poor in the lows, eg Vocal presets and
Cristal presets) are "rich" or "thick" presets like Punchy and Deep which are rich in bass in the
ring area It is seen to be placed on the opposite side of the.
This makes it possible, in particular, to avoid the risk that interpolation between two preset
values leads to equalization that is too neutral.
Rather, interpolation tends to give the best results, as the musically closest settings (e.g. setting
pair Vocal / Cristal, Punchy / Deep etc) are adjacent to each other.
FIG. 4 shows frequency response curves obtained by the various parameters shown in FIG.
Interpolation between two adjacent preset parameters (chips located angularly between two
presets), as well as parameters of zero frequency correction and their parameters (center and
outer peripheral region where correction is maximum) It will be appreciated that interpolation of
the chip located between can provide a very wide range of equalization presets, which can be
obtained in a particularly simple and intuitive way for the user.
In particular, it is not necessary to know or manipulate (as in the prior art) values of band center
frequency, quality factor and gain for the latter.
5a-5d illustrate a series of user interfaces that may be implemented by the associated headset
audio broadcast management application.
Figure 5a shows the main screen, with the remaining time of the battery powering the headset in
the middle and a series of buttons B 1, B 2 at the bottom, which can reach the screen shown in
Figures 5a-5d. , And B 3.
Alternatively, the transition from screen to screen can be done by sliding laterally with a finger
by means of a tactile interface.
FIG. 5 b shows a screen for adjusting the noise canceling function provided in the headset 200.
In a manner known per se, the noise canceling circuit of the headset needs to cancel out ambient
noise as precisely as possible in the final reproduction by the transducer as a goal.
Conventionally, this circuit picks up ambient noise through a microphone integrated into the
headset and uses the amplitude corresponding to the attenuation of the noise by the headset pad
to obtain the signal obtained from the inversion of the picked up noise signal, It works by
superimposing on the sound flow to be reproduced.
Although more sophisticated processing operations exist, the goal is again to neutralize ambient
noise at best.
According to this aspect of the present invention, as will be appreciated by those skilled in the
art, it can be implemented completely independently of the equalization setting function
described above, and the user is between maximum activity and overall inactivity. The degree of
noise suppressor activity can be set progressively in order to allow the listener to perceive the
surrounding acoustic environment.
This makes it possible to optimize the listening comfort depending on the application.
For example, if the headset is used as a hands-free device with a mobile phone (generally the
terminal 100 itself), the system will survive certain parts of the ambient noise to avoid a sense of
isolation, It can also allow speakers to perceive their voice more naturally.
FIG. 5 b shows a cursor for setting the noise compensation CR, for which purpose, the ambient
noise is continuously or stepwise between the zero compensation value and the maximum
compensation value corresponding to the canceling. Make it possible to adjust the compensation.
The current value ("25 dB") of the noise level that has undergone noise removal is displayed at
the center of the circle, and the cursor CR can be moved by the user's finger on the radius of the
circle (here vertical), The actual level ("58 dB") is displayed above this circle.
FIG. 5 c corresponds to FIG. 2 described above.
Finally, FIG. 5 d shows a screen of the simulation settings of the listening acoustics conditions, in
particular the reverberation type and width of the stereo image depending on the listening
location being simulated.
A series of circles CT 1, CT 2 in contact with one another show the simulated size and / or
reverberation or silence characteristics of the virtual listening location, the two loudspeaker
symbols HP g, HP d through the tactile interface The active circles can be spaced more or less
apart to selectively narrow or widen the stereo image.
The invention is of course not limited to the embodiments and variants described above, but one
of ordinary skill in the art will be able to make many adaptations based on his general
In particular, the invention applies to sound reproduction by means of any type of device, in
particular a headset, a set of loudspeakers, etc., in the form of an ear cover or with a wired or
wireless link The equalization processing operation may be implemented by any type of circuit,
such as digital or hybrid. In the case of a system with a headset, processing circuitry may be
provided to the headset as described above. As a variant, it may be provided in the user terminal
broadcasting the sound flow, the number and arrangement of the presets may vary as widely as
the graphical representation of the area in which their marks are arranged, the user interface ,
May vary widely depending on the type of device.
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