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FIELD OF THE INVENTION The invention relates to a method for multi-channel audio
transmission according to the preamble of claim 1.
In the case of known multi-channel audio transmission, for example a four-channel system such
as the 3/2 or Dolby Pro Logic, various matrix codings with different azimuthal resolution towards
the front are used. It's being used. These methods often have a central loudspeaker, which often
disturbs the composite image, and in the case of a central loudspeaker failure, a defect occurs in
the central configuration. This is extremely disadvantageous. In addition, ambient background
sound is released from the forward orientation area and becomes operative, which forms a
troublesome and unfriendly source of lateral sound. The simulated acoustic source between each
loudspeaker is relatively unstable due to the frequency stage, the coherence of the signal and the
receiver position. For the theory of multi-channel devices, see Production Partners 1993 and
1995, pages 24 to 32 and pages 47 to 48; It is commented by Schneider.
A further method of speechization is known, in which case spatial pulse responses are obtained
in real space or computer simulated space. This pulse response, after being superimposed with
the dry audio signal, achieves hidden audio reproduction, often via a binaural headphone
regenerator, and rarely via a multi-channel loudspeaker system. . The disadvantage of this
method is that the reproduction can only be performed in the case of a localizable point sound
source. Still other methods are known, in which case three of the four microphones have eightcharacter characteristics and one has spherical characteristics, pre-recorded through the matrix
circuit using four microphones Space is realized. However, in this case, the definition of the
image is relatively small. The method of voice conversion is described by Kleiner, M. Dalenbaeck,
B .; I. Svensson, P .; Of the paper "Auralization-an Overview" vol. 41, No. 11 (1993), pages 861 to
SUMMARY OF THE INVENTION The object of the present invention is to improve the stability of
the artificial acoustic source so that the overlapping of the reproduction can be sufficiently
blocked by the loudspeakers situated next. . The subject of the present invention is thus to
prevent the artificial sound source from moving unintentionally and for the location of the sound
source due to the receiver position not being exactly at the center of the axis between the two
loudspeakers. It is an object of the present invention to provide a multi-channel transmission
method which can prevent earthing from affecting the loudspeakers located next.
SUMMARY OF THE INVENTION In the present invention, the above-mentioned problems can be
solved by a method based on the features of claim 1 in particular.
Many features and configurations of the present invention are set forth in the following claims.
According to this new method, it is possible to form a relatively large audible surface, which can
only be formed in a narrow area in the case of the known three-dimensional sound method.
This can be achieved as follows.
This means that in order to ameliorate the constraints, speechization takes place, where multiple
spatial pulse responses are excited from different locations in the same space, and one location
via a multichannel receiver, eg a unidirectional microphone. Are to be received and recorded. A
multi-channel loudspeaker is used for reproduction. By means of the method according to the
invention, in particular the stability of the pseudo-sound source is improved and the overlapping
of the reproduction can be sufficiently blocked by the loudspeakers located next.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in detail on the
basis of the embodiments shown in the drawings. In the description, the abstract, the drawings
and the claims, the reference numerals given in the description of the reference numerals are
likewise used.
In FIG. 1 the microphone device used in one space is illustrated with the orienting device of eight
different uni-directional microphones 1 and 2 for receiving the divided spatial pulse signals. The
unidirectional microphones 1 are respectively shifted by approximately 60 degrees in succession
up to the orienting device shown in FIG. In the horizontal direction, the six orienting devices are
each offset by 60 degrees with respect to the unidirectional microphone 2. It should be noted
here that it is also possible to move the arrangement of single microphones by 60 degrees for
both vertical uni-directional microphone 1 and horizontal uni-directional microphone 2 as well. It
is also possible to move the arrangement of the unidirectional microphones, for example, 60
degrees each.
The orientations or positions of the eight different unidirectional microphones 1 and 2 shown in
FIG. 1 can be arbitrarily changed in accordance with the respective requirements.
FIG. 2 shows the receiver 3 directly above the center point of the space.
It is also possible for multiple recipients to stay in this area. Furthermore, FIG. 2 shows the
arrangement of the loudspeakers 6 according to FIG. 1 arranged horizontally and the
arrangement of the loudspeakers 4 arranged vertically. Partial signals are superimposed in the
digital speech processor 5. The processor 5 then obtains the ingress signal via the lead 7 which is
divided into right and left and center. The output of the digital audio processor 5 is also
connected to a loudspeaker 4 or 6 arranged in space. The spatial pulse responses received, for
example, by the microphone 2 are superimposed in one digital audio processor 7 and then
emitted via the loudspeaker 6. The receiver 3 can recognize all the signals emitted via the
loudspeaker 4 at that location, including the pseudo-sound source formed during the radiation. In
other words, voice conversion is clearly performed to improve the constraints. In that case,
multiple spatial pulse responses are excited by different locations in the same space and are
received and recorded at one location, for example by one or more unidirectional microphones
via a multichannel receiver. For reproduction, a multi-channel loudspeaker arrangement
consisting of loudspeakers 4 and 6 according to FIG. 2 is used, which reproduces the localizable
sound source on one section Requires at least two loudspeakers, at least three loudspeakers for
reproduction in one plane, and at least four loudspeakers for reproduction in one space. Onedimensional, two-dimensional or third-order by selecting the received spatial pulse response, the
directly received audio signal to be utilized for overlaying, and the reproduction loudspeaker 4 or
6 emitting the overlaid signal. Original voice reproduction can be realized. The gaps between the
loudspeakers are then filled by the pseudo sound source, which is stabilized by the
correspondingly oriented spatial pulse response. For stabilization, at least one spatial pulse
response must be emitted from the direction in which the simulated speech source can be
recognized. Mounting a simulated audio source between two supporting loudspeakers is limited
due to the breadth of directional characteristics. Therefore, more reproduction loudspeakers
should be available from the area where more spurious sound or reflection is expected.
In order to reproduce correctly from spatial dimensions or even spreading factor arrangements,
steps must be taken to evenly distribute the loudspeakers.
If spatial information is to be operated from above, the spatial information must be able to be
processed from above by the spatial pulse response. When playing from a sound source located
only around the reception position, at least four, preferably six, reproduction loudspeakers
should be used around the reception position or around one or more recipients It does not. If
only one line of sound sources is to be considered, then at most three one-line reproduction
loudspeakers are sufficient, among which the central reproduction loudspeaker is possibly
substituted by a pseudo sound source It is possible. For example, in order to realize the
transmission of partially separated three channels for a large screen video conference via two
loudspeakers arranged on the left and right of the picture receiving screen, the three spatial
pulse responses are positioned side by side with one another It must be detected by three sound
source positions. This source location is used to overlay the dry audio signals of the right, center
and left three loudspeakers reproduced on the screen. In the case of reproducing the overlapped
audio signal, the overlapped audio signal emitted from the right side sound source is reproduced
through the right loudspeaker. In a similar manner, the superimposed audio signal originating
from the left source is reproduced through the left loudspeaker while the superimposed audio
signal originating from the central source is of the same intensity via both loudspeakers. Be
regenerated. In order to reproduce all three same-sound source groups with the same sound, the
central groups emitted from the two loudspeakers are reproduced with a reduction of 3 dB in
audio level for both lateral sound groups. However, as already mentioned, it is of course also
possible to use other microphone devices and corresponding loudspeaker devices.
Brief description of the drawings
1 is a diagram of a microphone device with eight different orientation devices of a unidirectional
2 is a diagram of a loudspeaker system for reproduction.
Explanation of sign
1 vertically oriented microphone 2 horizontally oriented microphone 3 receiver 4 vertically
arranged loudspeaker 5 digital speech processor 6 horizontally arranged loudspeaker 7 intruder
for digital speech processor