FR2655228A1 - TELEVISION COMPRISING AN IMPROVED STEREO SYSTEM. - Google Patents

Abstract

A stereo sound reproduction television receiver, in particular a high definition type television set, has loudspeakers on both sides of the screen. In order to improve in particular the feeling of relief of the sound, additional loudspeakers (9, 10, 11), also suitable for the transmission of the entire sound spectrum, are incorporated in the two side walls of the television and possibly also in the top of the television. the device.

Description

1.

  The invention relates to

  stereophonic reproduction of sound, in particular

  especially high-definition televisions, the new standard for image and sound reproduction, the front of which presents loudspeakers

on both sides of the screen.

  With HDTVs, because of the larger image field, already approaching the

  cinema at home, the reproduction of sound becomes equal

  better, at least if it is done according to

  the two-way stereophonic system.

  The use of two loudspeakers in the usual basic stereophonic layout for the creation of a fictional sound source in the living room and, more importantly, the use of multiple loudspeakers all around the viewer, can not not be considered as solutions to the problem of

  stereophonic reproduction because the spatial perspective

  is thus established only in the simulation plan.

  between the loudspeakers Even small differences in the center point, compared to the loudspeakers, already give a tendency to audition the loudspeaker

nearest location.

  The object of the invention is a provision of the loudspeakers, in the television, by which one

  gets an "ambient sound", with a perception of spatial

  as in a concert hall, without the installation

  lation of loudspeakers distributed throughout the room.

  So far, we have incorporated

  small speakers in narrow vertical areas on both sides of the television picture field,

  where loudspeakers have been mounted outside the

  side kings of the TV in small, flat boxes

  voters, which could also be removed for use

  to read in a basic stereophonic layout in

the living room.

  The invention avoids this system, insufficient

  for hearing with relief, and is essentially

  characterized in that additional loudspeakers, also suitable for the transmission of the entire sound spectrum, are incorporated in the two side walls of the television. As a result of the orientation of the additional loudspeakers, they radiate to

  the walls of the room and create the preconditions

  lables for important effects of stereo listening

  phonics, in particular by enlarging the

audition area.

  According to another characteristic of the invention

  the side loudspeakers are equipped with a

  signal delay time, with a view to the delayed formation of a first lateral sound and several reflections of fragments of

  its side, so as to provide a so-

  like in a big concert hall.

  To give that impression, we can also

  provide for four or more

  as it is envisaged for the future reception.

  home use of high-definition television, as more loudspeakers

  can be incorporated, as desired, into the

side kings of the device.

  The side walls of the TV can accommodate dynamic systems as well as

electrostatic systems.

  Another feature of the invention

  provides that additional loudspeakers are

  also in the upper wall of the TV cabinet, speakers that are directed to the ceiling of the living room This has the advantage of providing a better distribution of sound, as in a concert hall, because of the radiation of these

  speakers to the ceiling of the room.

  In this context, it is possible to equip television sets, especially of the high-definition type, with

  devices for varying the stereo reproduction

  phonic sound according to the content of the image, so that for the representation of people in

  image, a narrow hearing area ensures

  increased visibility and presence, while in the case of

  extension of the space displayed on the screen, when

  that it is a matter of simulating a depth of space, the area of hearing is enlarged Thus, by

  example, the singer or the actor of theater must

  create a proximity effect in order to increase the intel-

  ligibility, without reflections due to local, while, for a large-scale sound event, in a large room or in the open air, the aforementioned devices

  successively act the direct signal, the

  xions and the reverb It is thus advantageous that the reproduction by the loudspeakers of the television is adaptable, according to the image presented on the screen,

  as regards the direction, distance and im-

  spatial pressure, adaptation being achievable by

a wireless remote control.

  For this purpose, one can predict, for each

  group of loudspeakers, electrical controls and

  and / or acoustic signals which act separately on the level and / or the frequency response and / or the propagation time, in particular by known applications

  ultrasound, infra-red commands

  In addition, it is possible to take into account the differences between the characteristics of

  reflection of the walls of the room and to make an adjustment

  subjective way to obtain optimal sound in the

part concerned.

  Finally, in order to obtain an optimal spatial impression comparable to that provided by stereo with a headset, it is possible to use

  more auditory resonances, analog or nu-

  which have been produced as soon as sound is taken by means of an artificial head or an artificial ear microphone, or which have been produced in the television, numerically for example. Other features and benefits of

  the invention will become clearer from the description of

  following description of a non-standard

  limiting, as well as the accompanying drawing, in which: Figure 1 shows a television according to the invention, with omission of details; Figure 2 shows the right side of the TV according to Figure 1, with the built-in loudspeakers, after removal of the protective grid; Figure 3 shows a television with two large loudspeakers on the side wall;

  FIG. 4 is a plan view of a

  léviseur; Figure 5 illustrates the propagation of sound waves from both small speakers on the

  front and side loudspeakers, provided for

  according to the invention, when the television is placed

  in front of the central part of a wall of a living room

  tation; and Figure 6 shows the path of the sound waves emitted from the side walls when the

  TV is placed in a corner of a living room.

  tation. FIG. 1 shows a television set according to the invention. Its box 1 contains the screen 2 and, from

  and other of this, in the image plane, a

  In accordance with the invention, the entire extent of the two side walls of the apparatus is also provided for loudspeakers, which are installed behind a wall of loudspeakers. protection 5

letting the sound pass.

  Figure 2 shows the loudspeakers 6,

  7 and 8 without protective wall and in the hastily

  The additional loudspeakers 9, 10 and 11 are provided, according to the invention, by their arrangement on the sides of the device, to radiate the sound to the walls of the living room located

  next to these extra speakers.

  The size of the speakers, especially

  of those planned in addition, may vary, but it is pos-

  can also be seen, as shown in Figure 3, of

  place side loudspeakers 12, 13 as large as possible and one of which can work with and

  the other without delay in the propagation of the signals.

  It is also possible to equip the loudspeakers with acoustic delay elements on their rear side in order to establish a unilateral directional effect. It is of course also possible to

  provide in each of the side walls a single

  loudspeaker designed for the entire sound spectrum, instead of the provision of several speakers in the sidewalls of the TV, also covering the entire

sound spectrum.

  Figure 4 is a plan view of television

  to show that the conical part 14 of the box

  can be used as a sound wall for the bass

  speakers 15, 16, to obtain a reproduction of low frequencies, less than 200 Hz, for example during the reproduction of music, which fills the entire space. Figure 5 illustrates the propagation of sound in the room when the television is placed approximately in front of the middle of a wall in the living room.

  arrows indicate only the directions of the propa-

  sound, regardless of the details

  complicated depending on the frequency.

  The front speakers produce only

  There is also a narrow sound propagation zone 17 and 18, which alone is insufficient to create a listening area of sufficient size for music and analogies. On the other hand, the side loudspeakers create zones of propagation. 19, 20 in which a succession of lateral sounds,

  first reflections and reverberations, preferably

  ence with delays in the propagation time and

  in addition, to optimize the spatial impression,

  analog or digital hearing

  which have been digitally generated as soon as

  sound using an artificial head or a micro-

  artificial ear phone, or in the TV itself.

  As shown in Figure 6, the installation

  TV in a corner of the room provides

  a similar effect thanks to the provision according to the invention

  loudspeakers on the sides, propagating the sound into the room through zones 21 and 22 The loudspeakers on the front of the unit have propagation zones

  23 and 24, and their action is

  as described for Figure 5.

Claims (3)

  1 Stereo-reproducing television receiver   sound system, the front of which has speakers installed on both sides of the screen, characterized in that additional loudspeakers (9, 10, 11, 12, 13), also suitable for the transmission of any the sound spectrum, are incorporated in both walls side of the TV.   2 television receiver according to claim 1 1, characterized in that the side loudspeakers (9, 10, 11, 12, 13) are provided with an electrical device for delay of the signal travel time, in view of the   delayed formation of a first lateral sound and several   reflections of fragments of its lateral, so as to provide a sound sensation as in a great concert hall.   3 television receiver according to claim 1 or 2, characterized in that loudspeakers are also incorporated in the upper wall of the television cabinet, speakers which are directed towards the ceiling of the living room.