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(2000 yen) June 6, 1972 Patent Office Director Mr. Tatsuo Miyake 2 Inventor address Germany
Easelnhagen im Camp 26 Name Peter fist Klaus Plukowitz 3 Patent applicant address Hamburg
Germany 13 · Harutnistela-der · vueke l -4--Patented patent application ■ Japanese Patent
Application Laid-Open No. 49-52603 unclaimed request-(All 3 pages) Specification L Title of the
Method of forming multi-channel eg medium-channel acoustic information
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording
originally created for two-channel stereophonic reproduction or to a method for forming one or
more channels, for example four-channel acoustical information. The existing 2-channel stereo
recording is almost identical to the new multi-channel recording created specially, with the
supply volume of the sound carrier and the reproduction equipment suitable for that being
manufactured with the multi-channel technology, eg φ still 8-track technology. A demand has
arisen to enable similar IC multichannel regeneration. Thus, in order to be able to reproduce the
conventional 2-channel recording also with Φ channel technology, various kinds. For example,
when creating a bovine channel stereo sound from a forward l stereo channel using a
reverberator, a distortion eliminator, or a time delay device, artificially created a threedimensional sound. However, of course, the desired sound quality can be obtained only in rare
special conditions. Further, when such an operation is performed, in general, in general, in the
stereophonic image, a mismatch between the synthetic stereo effect of the solo part voice
balanced in front and the EndPage: 1 stereo effect of the other acoustic components always
occurs. This is usually unavoidable, in the case of stereophonic acoustic images, the
predetermined balance on the recording side, which influences the signal to be extracted to
create a チ ャ ネ ル channel stereo stereo effect. In particular, not only is the solo voice usually
overemphasized if such a defect is present, but the solo voice also appears as a stereo signal in
the back channel, so that already at relatively low levels. There is a disadvantage that extremely
enhanced three-dimensional effect or hall effect is produced. The acoustic image in front also
becomes unclear by this, and it gets ugly with a clear thing. Originally, the same defect occurs for
all stereophonic sound components that need to be balanced not from one point of correct threedimensional sense and three-dimensional sense of direction but from the point of correct
acoustic intensity distribution situation in stereo space. A device known in the prior art that
forms two 辰 オ channels on the playback side and feeds them to the L or more backward
channels and channels utilizes a difference component that is assumed to be present in each
stereo recording. It is intended to form quasi-stereophonic sound components and thereby try to
compare as much as possible to the usage signal comprising mainly the sum component, which is
different from the subject matter of the invention. The method according to the invention is
already at the recording side according to the desires of the sound manufacturer to reduce the
components of the starting sound image before being introduced into the back channel, or
possibly depending on the characteristics of the starting sound image. By making it possible to
completely eliminate it, the above-mentioned drawbacks are eliminated.
According to the invention, in a method of the type mentioned at the outset, this is achieved in
the following manner, i.e. the signals of the front channel in such a way that the signal
components of the front channel are weakened or eliminated in each rear channel. The
components are processed according to the size and width of the film and mixed according to the
doubling phase so that there is no reaction, for the rear channel taken out of the components of
the two original two-channel signals belonging to both front channels It forms a signal. The
degree of removal of the signal component of the front channel can then be varied in accordance
with the aesthetics. This method is advantageously used separately for each rear regeneration
channel, in which case the removal effect for each rear, channel can be linked to a differential
subchannel forward channel signal division. In this way, the entire Φ channel stereo feeling is
well proportionally distributed il and clear with respect to the ninety thousand acoustic
components obtained directly in front. Stereoscopy 7 is performed on the bulky, already
relatively large stereo effect in the original stereophonic image, and thus on the sound group
spreading out without being removed. The method according to the invention is not only suitable
for the advantageous recording-side processing of four channel acoustic images, but also for the
intended balancing of conventional stereophonic recordings. In the device provided for the
implementation of the method according to the invention, a circuit element (attenuation element,
phase rotation element) is inserted in the signal path of the signal component supplied to the
rear channel before it merges. Using the elements, each signal component can be individually
adjusted in magnitude and phase, in which case the circuit elements provided for each of the rear
channels are adjustable as follows: It is adjustable so that the rejection in each of the raw
channels is related to different forward acoustic components. Attorney Attorney Roland
Sonderhoff EndPage: 25, List of Appendices (1) Description 1 004. (2) One power of attorney (3)
Priority certificate one () No. No. No.6, Inventors other than the above, patent applicant or agent
EndPage: 3
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