Classifications

• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K15/00—Acoustics not otherwise provided for
  • G10K15/08—Arrangements for producing a reverberation or echo sound
  • G10K15/12—Arrangements for producing a reverberation or echo sound using electronic time-delay networks
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S84/00—Music
  • Y10S84/26—Reverberation

Definitions

• the invention has set itself the goal of creating an electronic device for generating artificial reverberation which, using digital circuit arrangements, does not have the disadvantages of the known devices.
• the one-dimensional waveguide is a waveguide realized with digital circuitry, which contains at least two line sections of different lengths, each line section consisting of two digital delay arrangements running parallel to one another, one for each direction of planting, and furthermore at least one three-port adapter the wave digital filter technology is arranged between two line sections lying next to one another, two gates of the three-port adapter each being connected to one of the two mutually facing ends of these two line sections, and the dependent port of at least one three-port adapter being completed with a digitally implemented frequency-dependent absorber.
• the device according to the invention for producing artificial reverberation has a digitally implemented waveguide, which consists of many differently long, lossless sections with the same propagation constant and has a frequency difference over its total length pending absorbers are distributed.
• the one-dimensional waveguide is subjected to the signal to be reverberated, which propagates on it at a constant speed. If it encounters a connecting part of a three-port adapter between two line sections, the signal in the three-port adapter is not only weakened, but also split into a continuous and a reflected part. This repeats itself until only reflected parts remain.
• the absorbers that terminate the three-port adapters are loss resistors inserted into the one-dimensional waveguide, which are bridged by capacitors or inductors to influence their frequency response. These absorbers thus determine the Hall time frequency response of the device.
• the device for producing artificial reverberation also contains at least one two-port adapter of wave digital filter technology, which is arranged between two line sections lying next to one another, the two ports of the two-port adapter each having one of the two mutually facing ends thereof two line sections are connected. In this way, reflection can also be achieved at one point. Line sections of different wave resistance can also be implemented.
• the two-port adapters are known per se from DE-OS 20 27 303, see FIG. 15.
• a preferred embodiment of the device according to the invention is characterized in that the two ends of the waveguide are connected to one another, optionally with the interposition of a two-port adapter or a three-port adapter.
• a digital single-gate circuit which realizes the parallel connection of an ohmic resistor and an inductor can, for example, consist of the chain connection of an adder, a delay element, a multiplier and a second adder, the output of the multiplier being connected to the second input of the first adder and the Output of the delay element is connected to the second input of the second adder via a sign inverter.
• Another variant for emulating the parallel connection of an ohmic resistor and a capacitance has the same chain connection as described above, but differs in that a sign inverter is inserted between the first adder and the delay element.
• the series connection of an ohmic resistor and a capacitance can be realized by a digital single-gate circuit, which consists of the chain connection of an adder, a multiplier, a second adder, a premature inverter and a delay element, with the output of the single-gate circuit via a signed inverter is connected to the second input of the first adder and the input of the one-port circuit is connected to the second input of the second adder via a sign inverter.
• FIG. 1 shows a line section of a digitally implemented one-dimensional waveguide
• FIG. 2 shows a joint between two waveguides
• FIG. 3a shows a serial three-port adapter
• FIG. 3b shows a parallel three-port adapter 4a and 4b an absorber with a parallel connected reactance and ohmic resistance
• the Fig.4c and 4d an absorber with a series connected reactance and ohmic resistance
• the digital implementation of a serial line connection is referred to as a parallel three-port adapter and consists of the adders 22, 23, 24, 25, the sign inverters 27, 28, 29, 30 and the multiplier 31.
• the multiplier coefficient ⁇ is given by the expression.
• G 0 and G 1 are the waves resistances Z 0 and Z 1 corresponding conductivities of the tapped and tapped line).
• the three-port adapter can also be inserted between line sections with different wave impedance. However, such an arrangement has no particular advantages and has an unfavorable effect on the computing time and the signal-to-noise ratio, since in this case the three-port adapter requires an additional multiplier.
• inductance 33 and an ohmic resistor 32 and its digital circuit consists of adders 34, 35, the sign inverter 36, the delay element 37, and the multiplier 38.
• 4c shows an absorber with increasing absorption frequency response, which is composed of an ohmic resistor 46 and a capacitance 47 connected in series with it.
• 4d shows an absorber with a falling absorption frequency response, which is composed of a resistor 55 and an inductor 56 connected in series therewith.
• the frequency-dependent absorption can be explained by the fact that, for example, when the loss resistance is bridged by an inductor, the low-frequency signal components flow more or less unhindered through the inductance, whereas the higher-frequency components are forced into the loss resistor and partially absorbed there.
• the reverse Hall time frequency response is achieved by replacing the inductance with a capacitance.
• Two further types of absorbers with a series or parallel resonant circuit could be added as a reactance, but they have no practical significance due to their unnatural absorption frequency response.
• the basic theory of absorber circuits can be found in the "Journal of the Franklin Institute", vol. 300, no. 1, July 1975 pages 41 - 58.
• Fig. 8 shows the second embodiment, which consists of a "circular", one-dimensional waveguide, which is composed of several line sections 85-96 of different lengths and different wave resistance.
• section 86, 87 is off an inductor 98 and a resistor 97, an absorber built in serially, in section 89, 90 an absorber made up of a resistor 99 and a capacitance 100 is serially inserted, in section 93, 94 is a composite of a resistor 102 and a capacitance 101 Absorber connected.
• the signal S T which has not reverberated, is impressed on a point of the ring line 103 and propagates in both directions. It is partly reflected at the transitions forming the joints and partly absorbed in the loss resistances bridged by inductors and capacitors. If, for example, a pulse is pressed onto the ring line, it is split into two pulses passing through the ring line in opposite directions. Both pulses reach the taps 104 and 105 arranged symmetrically to the feed point at the same time, from where they are led to a subtractor 106, which eliminates them due to the difference.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Electrophonic Musical Instruments (AREA)
• Reverberation, Karaoke And Other Acoustics (AREA)
• Networks Using Active Elements (AREA)

Applications Claiming Priority (3)

Publications (1)

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Citations (6)

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• 1981
  • 1981-04-23 DE DE81AT8100009T patent/DE3152100D2/de not_active Expired
  • 1981-04-23 JP JP56501274A patent/JPS57500712A/ja active Pending
  • 1981-04-23 WO PCT/AT1981/000009 patent/WO1981003566A1/de active Application Filing
  • 1981-04-23 GB GB8202234A patent/GB2089624B/en not_active Expired
  • 1981-04-23 US US06/354,083 patent/US4475229A/en not_active Expired - Fee Related
  • 1981-05-25 ES ES502475A patent/ES502475A0/es active Granted
  • 1981-05-26 FR FR8110449A patent/FR2489625B1/fr not_active Expired
  • 1981-05-28 CA CA000378528A patent/CA1161537A/en not_active Expired

Patent Citations (6)

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