US20150176890A1 - Cryogenically Treated Audio/Video Cable and Method Thereof - Google Patents
Cryogenically Treated Audio/Video Cable and Method Thereof Download PDFInfo
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- US20150176890A1 US20150176890A1 US14/137,329 US201314137329A US2015176890A1 US 20150176890 A1 US20150176890 A1 US 20150176890A1 US 201314137329 A US201314137329 A US 201314137329A US 2015176890 A1 US2015176890 A1 US 2015176890A1
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- cryogenic
- cryogenic chamber
- chamber
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- cable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables
- H01B13/0167—After-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/12—Arrangements for exhibiting specific transmission characteristics
Definitions
- the present invention relates in general to audio/video cabling, and, more particularly, to an audio/video cable and method of cryogenically treating the cable for enhanced structure and electrical performance.
- Musical instruments have long been popular in society providing entertainment, social interaction, self-expression, and business and source of livelihood for many people.
- Musical instruments and related accessories are used by professional and amateur musicians to generate, alter, transmit, and reproduce audio signals.
- Common musical instruments include an electric guitar, bass guitar, violin, horn, brass, drum, wind instrument, string instrument, piano, organ, electric keyboard, and percussion instrument.
- the audio signal from the musical instrument is typically an analog signal containing a progression of values within a continuous range.
- the audio signal can also be digital in nature as a series of binary one or zero values.
- the audio signal from the musical instrument is transmitted through an audio cable to signal processing equipment, such as an amplifier, speaker, mixer, synthesizer, sampler, effects pedal, public address system, sound recorder, and similar accessories to amplify, alter, combine, store, play back, and audibly reproduce sound from the analog or digital audio signals originating from the musical instrument.
- signal processing equipment such as an amplifier, speaker, mixer, synthesizer, sampler, effects pedal, public address system, sound recorder, and similar accessories to amplify, alter, combine, store, play back, and audibly reproduce sound from the analog or digital audio signals originating from the musical instrument.
- the musical instrument is connected to the accessories by audio and control cables, e.g., instrument cables, speaker cables, XLR cables, DIN cables, and AES3 cables, to transmit the analog or digital audio signals and control signals from one device to another.
- audio and control cables e.g., instrument cables, speaker cables, XLR cables, DIN cables, and AES3 cables
- an electric guitar is connected from its output jack through an audio cable to an audio amplifier.
- the output of the audio amplifier is connected by another audio cable to a speaker to audibly reproduce the sound from the electric guitar.
- the audio cabling between the musical instrument and accessories typically contains conductive wiring or routing elements that enable transmission of the audio signals.
- An audio cable includes one or more conductors capable of conducting electrical current in the presence of an applied potential to transmit and receive electrical signals representative of the information content of the audio data.
- the electrons move between adjacent atoms in response to the applied potential to create an electric current.
- the mobility of the conductive material is often indicated by its resistivity. The lower the resistivity of the conductive material, the greater the conductive mobility, i.e., the more readily the electrons move between adjacent atoms in the presence of a given potential.
- Audio cables in common use have limitations due to imperfections in the molecular structure and properties of the conductor. Any misalignment in the molecular structure of the conductor contributes to higher resistance within the cable. Molecular misalignment can further reduce frequency response and cause distortion, attenuation, frequency spikes, and other degradations in signal quality during transmission through the conductor.
- Signal quality in the audio cable is an important consideration to the music community. Cable design and construction is key to preserving the quality of the audio signals. Any loss or degradation in the signal quality through the audio cable can be noticeable in the audible response during reproduction of the original audio signal.
- the present invention is a method of cryogenically treating a cable comprising the steps of providing a cryogenic chamber, disposing the cable within the cryogenic chamber, establishing a cryogenic treatment temperature in the cryogenic chamber to a level between ⁇ 157° C. and ⁇ 184° C., holding the cryogenic treatment temperature in the cryogenic chamber at the level for an 8-12 hour period, and returning the cryogenic chamber to an ambient temperature.
- the present invention is a method of cryogenically treating a conductor comprising the steps of providing a cryogenic chamber, disposing the conductor within the cryogenic chamber, establishing a cryogenic treatment temperature in the cryogenic chamber at a level between ⁇ 157° C. and ⁇ 184° C., holding the cryogenic treatment temperature in the cryogenic chamber to cryogenically treat the conductor, and establishing an ambient temperature in the cryogenic chamber.
- the present invention is a method of cryogenically treating a conductor comprising the steps of providing a cryogenic chamber, disposing the conductor within the cryogenic chamber, establishing a cryogenic treatment temperature in the cryogenic chamber, and holding the cryogenic treatment temperature in the cryogenic chamber to cryogenically treat the conductor.
- the present invention is a cryogenic system for treating a cable comprising a cryogenic chamber and cooling source coupled to the cryogenic chamber.
- a cable is disposed within the cryogenic chamber.
- a computer control system is coupled to the cooling source for controlling a temperature in the cryogenic chamber by establishing a cryogenic treatment temperature in the cryogenic chamber at a level between ⁇ 157° C. and ⁇ 184° C., and holding the cryogenic treatment temperature in the cryogenic chamber at the level to cryogenically treat the cable.
- FIG. 1 illustrates an audio sound source generating an audio signal and routing the audio signal through signal processing equipment to a speaker;
- FIG. 2 illustrates a guitar connected to an audio amplifier and speaker
- FIG. 3 illustrates an audio cable with flexible cable portion and end plugs
- FIGS. 4 a - 4 b illustrate the cable portion with internal conductors and insulating layers
- FIG. 5 illustrates a cryogenic chamber for treating the audio cable
- FIG. 6 illustrates a cryogenic treatment profile with a linear ramp up, steady state, and linear ramp down
- FIG. 7 illustrates another cryogenic treatment profile with stepped ramp up, steady state, and stepped ramp down
- FIG. 8 illustrates a cryogenic chamber for treating the inner conductor
- FIG. 9 illustrates a pickup for an electric guitar which is subjected to a cryogenic treatment profile.
- FIG. 1 illustrates an audio sound system 10 including an audio sound source 12 which generates electric signals representative of sound content.
- Audio sound source 12 can be a musical instrument, audio microphone, multi-media player, or other device capable of generating electric signals representative of sound content.
- the musical instrument can be an electric guitar, bass guitar, violin, horn, brass, drum, wind instrument, string instrument, piano, electric keyboard, or percussion instrument, just to name a few.
- the electrical signals from audio sound source 12 are routed through audio cable 14 to signal processing equipment or accessory 16 for signal conditioning and power amplification.
- Signal processing equipment 16 can be an audio amplifier, computer, pedal board, signal processing rack, or other equipment or accessory capable of performing signal processing functions on the audio signal.
- the signal processing function can include amplification, filtering, equalization, sound effects, and user-defined modules that adjust the power level and enhance the signal properties of the audio signal.
- the signal conditioned audio signal is routed through audio cable 18 to speaker 20 to reproduce the sound content of audio sound source 12 with the enhancements introduced into the audio signal by signal processing equipment 16 .
- FIG. 2 shows a musical instrument as audio sound source 12 , e.g., electric guitar 30 .
- One or more pickups 32 are mounted under strings 34 of electric guitar 30 and convert string movement or vibration to electrical signals representative of the intended sounds from the vibrating strings.
- the electrical signals extend over a range or spectrum of frequencies with an amplitude associated with each frequency component.
- the electrical signals from guitar 30 are routed through audio cable 36 to audio amplifier 38 for signal processing and power amplification.
- Audio cable 36 includes a connector or plug 40 inserted into an output jack of guitar 30 and connector or plug 42 inserted to an input jack of audio amplifier 38 .
- the signal conditioning provided by audio amplifier 38 may include amplification, filtering, equalization, sound effects, user-defined modules, and other signal processing functions that adjust the power level and enhance the signal properties of the audio signal.
- the power amplification provided by audio amplifier 38 increases or decreases the power level and signal strength of the audio signal to drive the speaker and reproduce the sound content intended by the vibrating strings 34 of electric guitar 30 with the enhancements introduced into the audio signal by the audio amplifier.
- a front control panel of audio amplifier 38 includes a display and control knobs and buttons to allow the user to monitor and manually control various settings of the audio amplifier.
- Audio cable 44 includes a connector or plug 48 inserted into an output jack of audio amplifier 38 and connector or plug 50 inserted to an input jack of speaker 46 .
- Speaker 46 audibly reproduces the audio signal originating from guitar 30 for recognition and appreciation by an audience or listener.
- a front control panel of speaker 46 may include a display and control knobs and buttons to allow the user to monitor and manually control various settings of the speaker.
- FIG. 3 shows audio cable 36 including flexible cable portion 52 and connectors or end plugs 40 - 42 .
- Audio cable 44 has a similar arrangement.
- Audio cable 36 is capable of analog or digital signal transmission.
- Cable end plugs 40 - 42 make a removable physical and electrical (electro-mechanical) connection between cable portion 52 and the musical instrument or accessory, e.g., between guitar 30 and audio amplifier 38 .
- Plugs 40 - 42 vary with respect to size, materials, contact resistance, insulation, design, and pinout. Plugs 40 - 42 are made with silver, gold, platinum, or nickel plating reduce signal loss and improve signal quality.
- Plugs 40 - 42 generally have pins or prongs that are inserted into openings of a mating jack, socket, or other physical and electrical interface, and may include a locking mechanism for mechanical support. Plugs 40 - 42 can be keyed to ensure mating of the plug with the intended physical and electrical interface that matches the orientation of the plug. Plugs 40 - 42 are designed to reduce electromagnetic interference (EMI), radio frequency interference (RFI), and cross-talk.
- EMI electromagnetic interference
- RFID radio frequency interference
- plugs 40 - 42 used for audio applications include tip and sleeve (TS) 1 ⁇ 4′′ jacks, XLR connectors, RCA connectors, banana plugs, Speakon connectors, 1 ⁇ 8′′ mini jacks, D-Sub cable connectors, musical instrument digital interface (MIDI) connectors, universal serial bus (USB) connectors, Sony Phillips digital interface (S/PDIF) connectors, firewire (IEEE 1394) connectors, Audio Engineering Society/European Broadcast Society (AES/EBU) connectors, Bayonet Neill-Concelman (BNC) connectors, and Tascam digital interface (TDFI) connectors.
- MIDI musical instrument digital interface
- USB universal serial bus
- S/PDIF Sony Phillips digital interface
- IEEE 1394 Firewire
- AES/EBU Audio Engineering Society/European Broadcast Society
- BNC Bayonet Neill-Concelman
- TDFI Tascam digital interface
- FIG. 4 a shows a cut-away view of cable portion 52 made with a variety of materials, lengths, diameters or cross-sectional areas, and electrical specifications depending on the end application.
- FIG. 4 b is a cross-sectional view of cable portion 52 .
- An inner conductor 56 transmits the audio signal through a solid material or twisted strands.
- the inner conductor 56 can be copper (Cu), oxygen-free Cu (OFC), crystal oxygen-free copper (LC-OFC), electrolytic tough pitch (ETP) Cu, annealed Cu, silver (Ag), gold (Au), aluminum (Al), tin (Sn), nickel (Ni), alloys thereof, or other metal.
- inner conductor 56 uses 8-10 Cu strands or wires which are spun, woven, or twisted together to a width or diameter of 16-20 gauge (0.81-1.29 millimeters (mm)). The twisting pattern of inner conductor 56 should be uniform and tight to bring the strands in close proximity to one another to increase noise rejection.
- inner conductor 56 is a single solid conductor.
- An inner insulating or dielectric layer or sleeve 58 is formed over inner conductor 56 .
- the inner insulating layer 58 can be poly(vinyl chloride) (PVC), neoprene, nylon, polyethylene, polypropylene, carbon impregnated plastic, silicone rubber, polytetrafluoroethylene (PTFE), ethylene propylene rubber (EPR), ethylene propylene polymer (EPM), ethylene propylene diene polymer (EPDM), ethylene alkene co-polymer (EAM), or other plastic or polymer material extruded over inner conductor 56 .
- PVC poly(vinyl chloride)
- neoprene nylon
- polyethylene polypropylene
- carbon impregnated plastic silicone rubber
- PTFE polytetrafluoroethylene
- EPR ethylene propylene rubber
- EPM ethylene propylene polymer
- EPDM ethylene propylene diene polymer
- EAM ethylene alkene co-polymer
- a shielding conductor 60 is formed over inner insulating layer 58 as a ground conductor and shield for EMI, RFI, and cross-talk isolation.
- Shielding conductor 60 can be spiral, braided, or foil Cu, Ag, Au, Al, Sn, Ni, alloys thereof, or other metal.
- shielding conductor 60 uses braided Cu strands to form a sheath around inner insulating layer 58 .
- Braided shielding is durable, flexible, and effective for protecting cable portion 52 against rough handling or physical interaction (bending, pulling, and stepping on) often imposed upon audio cables.
- spiral wrapped shielding involves wrapping one or more wire strands in a spiral around inner insulating layer 58 .
- Foil shielding is a mylar-backed aluminum tube with a copper drain wire connected at each end. Foil shielding is typically used for cables that are stationary and involve minimal physical interaction, such as a patch cable.
- Shielding conductor 60 provides EMI, RFI, and cross-talk isolation to reduce noise or degradation of the electronic signals transmitted through inner conductor 56 .
- An outer insulating or dielectric layer or sleeve 62 is formed over shielding conductor 60 .
- the outer insulating layer 62 can be PVC, neoprene, nylon, polyethylene, polypropylene, carbon impregnated plastic, silicone rubber, PTFE, EPR, EPM, EPDM, EAM, or other plastic or polymer material extruded over shielding conductor 60 .
- outer insulating layer 62 provides structural support, protection, and flexibility, as well as maintaining spacing and electrical isolation of the shielding conductor.
- An outer jacket 64 is formed over outer insulating layer 62 for protection from mechanical stress, moisture, heat, and chemical exposure and to enhance the texture or feel of audio cable 36 .
- outer jacket 64 is a woven cloth material such as nylon or polyester. Outer jacket 64 facilitates identification of audio cable 36 by marking, pattern, and color.
- Cable portion 52 including inner conductor 56 , inner insulating layer 58 , shielding conductor 60 , outer insulating layer 62 , and outer jacket 64 , has a diameter of 6-8 mm and properties of flexibility, tangle resistant, handling noise abatement, and physical durability.
- Cable 36 has a length ranging from 0.3-8.0 meters (m) and can be used in audio and video (A/V) applications and transmit analog or digital signals.
- A/V cable 36 uses a variety of connectors or plugs depending on the application and the signal being transmitted through the cable.
- Cable 36 can be used as an instrument cable, speaker cable, patch cable, microphone cable, snake cable, XLR cable, DIN cable, and AES3 cable.
- Some types of cables e.g., high-definition multimedia interface (HDMI), firewire, digital media port, and coaxial cables, are capable of carrying both audio and video signals simultaneously.
- HDMI high-definition multimedia interface
- FIG. 5 illustrates cryogenic chamber or tank 70 including an interior space 72 of sufficient volume to hold multiple audio cables 36 , including cable portion 52 and plugs 40 - 42 .
- audio cables 36 are hung or disposed vertically within interior space 72 , as shown in FIG. 5 .
- Plug 40 is placed within a slot of bracket 74 with cable portion 52 and plug 42 hanging down or extending vertically from the bracket.
- audio cables are disposed horizontally, either linearly or in a coil, on shelves within interior space 72 .
- Each audio cable 36 is physically separated from adjacent audio cables to allow all surface areas of cable portion 52 and plugs 40 - 42 to be evenly and uniformly exposed to varying temperatures within cryogenic chamber 70 .
- a liquid nitrogen source 76 is connected to heat exchanger 78 by flow control valve 80 and conduit 82 .
- the coolant source can be liquid helium or other coolant.
- the liquid nitrogen is converted to a gaseous state in heat exchanger 78 .
- the super-cooled nitrogen gas is pumped into cryogenic chamber 70 through pump 86 and conduit 88 .
- Ventilation system 84 includes one or more fans to uniformly distribute the super-cooled nitrogen gas within inner space 72 of cryogenic chamber 70 as a dry cryogenic treatment.
- Computer control system 90 controls the flow rate of liquid nitrogen into heat exchanger 78 by way of flow control valve 80 to regulate the flow of nitrogen gas and control the temperature within cryogenic chamber 70 .
- Computer control system 90 executes software configured for scheduling, monitoring, and implementing the phases of the cryogenic treatment profile.
- a sensor or thermocouple 92 within cryogenic chamber 70 monitors temperature within the chamber and continuously provides temperature readings to computer control system 90 by sensor connection 94 .
- Audio cables 36 are subjected to a cryogenic treatment temperature profile to cryogenically treat the audio cable, including inner conductor 56 .
- FIG. 6 shows an example of cryogenic treatment profile 100 .
- Audio cables 36 are placed onto bracket 74 within inner space 72 of chamber 70 .
- Computer control system 90 sets flow control valve 80 to release liquid nitrogen into heat exchanger 78 .
- Super-cooled nitrogen gas is pumped through ventilation system 84 into cryogenic chamber 70 to uniformly distribute the coolant to all surface areas of cable portion 52 and plugs 40 - 42 .
- the time between t 0 -t 1 of cryogenic treatment profile 100 is about a 12 hour period to avoid thermal shock, residual stress, and formation of cracks in audio cable 36 .
- time t 1 and t 2 of cryogenic treatment profile 100 the temperature within inner space 72 of cryogenic chamber 70 is held steady state at temp 1 for an 8-12 hour period.
- cryogenic treatment profile 100 Between time t 2 and t 3 of cryogenic treatment profile 100 , the temperature within inner space 72 of cryogenic chamber 70 increases or linearly ramps up from temp 1 back to temp 0 (ambient temperature).
- the time between t 2 -t 3 of cryogenic treatment profile 100 is about an 8 hour period to return to ambient temperature while avoiding thermal shock, residual stress, and formation of cracks in audio cable 36 .
- the temperature in cryogenic chamber 70 remains uniform throughout inner space 72 during each phase of cryogenic treatment profile 100 .
- audio cable 36 is removed from cryogenic chamber 70 .
- FIG. 7 shows another cryogenic treatment profile 110 .
- Computer control system 90 sets flow control valve 80 to release liquid nitrogen into heat exchanger 78 .
- Super-cooled nitrogen gas is pumped through ventilation system 84 into cryogenic chamber 70 to uniformly distribute the coolant to all surface areas of cable portion 52 and plugs 40 - 42 .
- the temperature within inner space 72 decreases by a 50° C. step from temp 0 to ⁇ 29° C. and then held steady state at ⁇ 29° C. for 1-2 hours.
- the temperature within inner space 72 is stepped down by another 50° C. and then held there steady state for 1-2 hours.
- the process repeats until temp 1 is reached, as shown by steps 112 between time t 0 -t 1 .
- the time between t 0 -t 1 of cryogenic treatment profile 110 is about a 12 hour period to avoid thermal shock, residual stress, and formation of cracks in audio cable 36 .
- the temperature within inner space 72 of cryogenic chamber 70 is held steady state at temp 1 for an 8-12 hour period.
- the temperature within inner space 72 of cryogenic chamber 70 increases in discrete or staggered steps 114 from temp 1 back to temp 0 (ambient temperature).
- the temperature within inner space 72 is increased by a 50° C. step from temp 1 and then held there steady state for 1-2 hours.
- the temperature within inner space 72 is stepped up by another 50° C. and then held there steady state for 1-2 hours.
- the process repeats from temp 0 to temp 1 , as shown by steps 114 between time t 2 -t 3 .
- the time between t 2 -t 3 of cryogenic treatment profile 110 is about an 8 hour period to return to ambient temperature while avoiding thermal shock, residual stress, and formation of cracks in audio cable 36 .
- the temperature in cryogenic chamber 70 remains uniform throughout inner space 72 during each phase of cryogenic treatment profile 100 . After time t 3 or t 4 , audio cable is removed from cryogenic chamber 70 .
- Cryogenic treatment of audio cable 36 realigns the molecular structure of inner conductor 56 to increase electron mobility while enhancing the structural and conductive properties of the inner conductor.
- the molecules of inner conductor 56 compact by removing gaps and impurities, such as oxygen, to achieve more homogeneity of variance in the molecular structure, i.e., increase the density of the molecular structure.
- the cryogenically treated audio cable 36 exhibits enhanced electrical properties including lower resistance, greater signal frequency response, reduced frequency spikes, higher signal quality, and faster signal propagation speed, while achieving longer cable runs and noticeably improved audible quality.
- the cryogenically treated audio cable 36 achieves a high degree of balance, maintain a full range frequency response, provide smooth separation, fine dynamics, and preserve the electrical signals transmitted through the cable to faithfully reproduce the original sound content.
- the cryogenically treated audio cable 36 including components of cable portion 52 and plugs 40 - 42 , exhibit improved wear resistance, stress relief, abrasion and fatigue resistance, yield strength, tensile strength, impact strength, hardness, thermal conductivity, and elastic modulus.
- bare inner conductor 56 i.e., prior to formation of inner insulating layer 58 , shielding conductor 60 , outer insulating layer 62 , and outer jacket 64 , are placed within interior space 72 of cryogenic chamber 70 .
- inner conductors 56 wound in spools 116 are disposed on shelves 118 within interior space 72 , as shown in FIG. 8 .
- the inner conductors 56 are subjected to cryogenic treatment profile 100 or 110 , as described with respect to FIGS. 6-7 . After treatment, inner conductor 56 can be formed as audio cable 56 , as described in FIGS. 3-4 .
- Cryogenic treatment of inner conductor 56 realigns the molecular structure to increase electron mobility while enhancing the structural and conductive properties of the inner conductor.
- the molecules of inner conductor 56 compact by removing gaps and impurities such as oxygen to achieve more homogeneity of variance in the molecular structure, i.e., increase the density of the molecular structure.
- the cryogenically treated inner conductor 56 exhibits enhanced electrical properties including lower resistance, greater signal frequency response, reduced frequency spikes, higher signal quality, and faster signal propagation speed, while achieving noticeably improved audible quality.
- the cryogenically treated inner conductor 56 achieves a high degree of balance, maintains a full range frequency response, provides smooth separation, fine dynamics, and preserves the electrical signals transmitted through the cable to faithfully reproduce the original sound content.
- FIG. 9 illustrates a magnetic pickup 120 for mounting to the body of guitar 30 .
- Pickup 120 includes a permanent magnet 122 within bobbin 124 which is wrapped by wire 126 .
- Permanent magnet 122 magnetizes strings 34 to produce a signal in wire 126 as the string vibrates.
- Wire 126 can be Cu, Ag, Au, Al, Sn, Ni, alloys thereof, or other metal.
- the assembled pickup 120 with wire 126 , or just bare wire 126 is placed within interior space 72 of cryogenic chamber 70 , similar to FIGS. 5 and 8 .
- Wire 126 is subjected to cryogenic treatment profile 100 or 110 , as described with respect to FIGS. 6-7 .
- cryogenically treated wire can be used in a speaker voice coil, microphone, instrument string, and A/V cabling.
- cryogenic treatment of the conductor realigns the molecular structure to increase electron mobility while enhancing the structural and conductive properties of the conductor.
- the molecules of the conductor compact by removing gaps and impurities such as oxygen to achieve more homogeneity of variance in the molecular structure, i.e., increase the density of the molecular structure.
- the cryogenically treated conductor exhibits enhanced electrical properties including lower resistance, greater signal frequency response, reduced frequency spikes, higher signal quality, and faster signal propagation speed.
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Abstract
Description
- The present invention relates in general to audio/video cabling, and, more particularly, to an audio/video cable and method of cryogenically treating the cable for enhanced structure and electrical performance.
- Musical instruments have long been popular in society providing entertainment, social interaction, self-expression, and business and source of livelihood for many people. Musical instruments and related accessories are used by professional and amateur musicians to generate, alter, transmit, and reproduce audio signals. Common musical instruments include an electric guitar, bass guitar, violin, horn, brass, drum, wind instrument, string instrument, piano, organ, electric keyboard, and percussion instrument. The audio signal from the musical instrument is typically an analog signal containing a progression of values within a continuous range. The audio signal can also be digital in nature as a series of binary one or zero values. The audio signal from the musical instrument is transmitted through an audio cable to signal processing equipment, such as an amplifier, speaker, mixer, synthesizer, sampler, effects pedal, public address system, sound recorder, and similar accessories to amplify, alter, combine, store, play back, and audibly reproduce sound from the analog or digital audio signals originating from the musical instrument.
- The musical instrument is connected to the accessories by audio and control cables, e.g., instrument cables, speaker cables, XLR cables, DIN cables, and AES3 cables, to transmit the analog or digital audio signals and control signals from one device to another. For example, an electric guitar is connected from its output jack through an audio cable to an audio amplifier. The output of the audio amplifier is connected by another audio cable to a speaker to audibly reproduce the sound from the electric guitar.
- The audio cabling between the musical instrument and accessories typically contains conductive wiring or routing elements that enable transmission of the audio signals. An audio cable includes one or more conductors capable of conducting electrical current in the presence of an applied potential to transmit and receive electrical signals representative of the information content of the audio data. Within the molecular structure of the conductor, the electrons move between adjacent atoms in response to the applied potential to create an electric current. The mobility of the conductive material is often indicated by its resistivity. The lower the resistivity of the conductive material, the greater the conductive mobility, i.e., the more readily the electrons move between adjacent atoms in the presence of a given potential.
- Audio cables in common use have limitations due to imperfections in the molecular structure and properties of the conductor. Any misalignment in the molecular structure of the conductor contributes to higher resistance within the cable. Molecular misalignment can further reduce frequency response and cause distortion, attenuation, frequency spikes, and other degradations in signal quality during transmission through the conductor.
- Signal quality in the audio cable is an important consideration to the music community. Cable design and construction is key to preserving the quality of the audio signals. Any loss or degradation in the signal quality through the audio cable can be noticeable in the audible response during reproduction of the original audio signal.
- A need exists for enhancing the molecular and structural properties of audio/video cabling to achieve higher quality signal transmission. Accordingly, in one embodiment, the present invention is a method of cryogenically treating a cable comprising the steps of providing a cryogenic chamber, disposing the cable within the cryogenic chamber, establishing a cryogenic treatment temperature in the cryogenic chamber to a level between −157° C. and −184° C., holding the cryogenic treatment temperature in the cryogenic chamber at the level for an 8-12 hour period, and returning the cryogenic chamber to an ambient temperature.
- In another embodiment, the present invention is a method of cryogenically treating a conductor comprising the steps of providing a cryogenic chamber, disposing the conductor within the cryogenic chamber, establishing a cryogenic treatment temperature in the cryogenic chamber at a level between −157° C. and −184° C., holding the cryogenic treatment temperature in the cryogenic chamber to cryogenically treat the conductor, and establishing an ambient temperature in the cryogenic chamber.
- In another embodiment, the present invention is a method of cryogenically treating a conductor comprising the steps of providing a cryogenic chamber, disposing the conductor within the cryogenic chamber, establishing a cryogenic treatment temperature in the cryogenic chamber, and holding the cryogenic treatment temperature in the cryogenic chamber to cryogenically treat the conductor.
- In another embodiment, the present invention is a cryogenic system for treating a cable comprising a cryogenic chamber and cooling source coupled to the cryogenic chamber. A cable is disposed within the cryogenic chamber. A computer control system is coupled to the cooling source for controlling a temperature in the cryogenic chamber by establishing a cryogenic treatment temperature in the cryogenic chamber at a level between −157° C. and −184° C., and holding the cryogenic treatment temperature in the cryogenic chamber at the level to cryogenically treat the cable.
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FIG. 1 illustrates an audio sound source generating an audio signal and routing the audio signal through signal processing equipment to a speaker; -
FIG. 2 illustrates a guitar connected to an audio amplifier and speaker; -
FIG. 3 illustrates an audio cable with flexible cable portion and end plugs; -
FIGS. 4 a-4 b illustrate the cable portion with internal conductors and insulating layers; -
FIG. 5 illustrates a cryogenic chamber for treating the audio cable; -
FIG. 6 illustrates a cryogenic treatment profile with a linear ramp up, steady state, and linear ramp down; -
FIG. 7 illustrates another cryogenic treatment profile with stepped ramp up, steady state, and stepped ramp down; -
FIG. 8 illustrates a cryogenic chamber for treating the inner conductor; and -
FIG. 9 illustrates a pickup for an electric guitar which is subjected to a cryogenic treatment profile. - The present invention is described in one or more embodiments in the following description with reference to the figures, in which like numerals represent the same or similar elements. While the invention is described in terms of the best mode for achieving the invention's objectives, it will be appreciated by those skilled in the art that it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims and their equivalents as supported by the following disclosure and drawings.
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FIG. 1 illustrates anaudio sound system 10 including anaudio sound source 12 which generates electric signals representative of sound content.Audio sound source 12 can be a musical instrument, audio microphone, multi-media player, or other device capable of generating electric signals representative of sound content. The musical instrument can be an electric guitar, bass guitar, violin, horn, brass, drum, wind instrument, string instrument, piano, electric keyboard, or percussion instrument, just to name a few. The electrical signals fromaudio sound source 12 are routed throughaudio cable 14 to signal processing equipment oraccessory 16 for signal conditioning and power amplification.Signal processing equipment 16 can be an audio amplifier, computer, pedal board, signal processing rack, or other equipment or accessory capable of performing signal processing functions on the audio signal. The signal processing function can include amplification, filtering, equalization, sound effects, and user-defined modules that adjust the power level and enhance the signal properties of the audio signal. The signal conditioned audio signal is routed throughaudio cable 18 tospeaker 20 to reproduce the sound content ofaudio sound source 12 with the enhancements introduced into the audio signal bysignal processing equipment 16. -
FIG. 2 shows a musical instrument asaudio sound source 12, e.g.,electric guitar 30. One ormore pickups 32 are mounted understrings 34 ofelectric guitar 30 and convert string movement or vibration to electrical signals representative of the intended sounds from the vibrating strings. The electrical signals extend over a range or spectrum of frequencies with an amplitude associated with each frequency component. The electrical signals fromguitar 30 are routed throughaudio cable 36 toaudio amplifier 38 for signal processing and power amplification.Audio cable 36 includes a connector orplug 40 inserted into an output jack ofguitar 30 and connector orplug 42 inserted to an input jack ofaudio amplifier 38. The signal conditioning provided byaudio amplifier 38 may include amplification, filtering, equalization, sound effects, user-defined modules, and other signal processing functions that adjust the power level and enhance the signal properties of the audio signal. The power amplification provided byaudio amplifier 38 increases or decreases the power level and signal strength of the audio signal to drive the speaker and reproduce the sound content intended by the vibratingstrings 34 ofelectric guitar 30 with the enhancements introduced into the audio signal by the audio amplifier. A front control panel ofaudio amplifier 38 includes a display and control knobs and buttons to allow the user to monitor and manually control various settings of the audio amplifier. - The signal conditioned audio signal is routed from
audio amplifier 38 throughaudio cable 44 tospeaker 46.Audio cable 44 includes a connector orplug 48 inserted into an output jack ofaudio amplifier 38 and connector orplug 50 inserted to an input jack ofspeaker 46.Speaker 46 audibly reproduces the audio signal originating fromguitar 30 for recognition and appreciation by an audience or listener. A front control panel ofspeaker 46 may include a display and control knobs and buttons to allow the user to monitor and manually control various settings of the speaker. -
FIG. 3 showsaudio cable 36 includingflexible cable portion 52 and connectors or end plugs 40-42.Audio cable 44 has a similar arrangement.Audio cable 36 is capable of analog or digital signal transmission. Cable end plugs 40-42 make a removable physical and electrical (electro-mechanical) connection betweencable portion 52 and the musical instrument or accessory, e.g., betweenguitar 30 andaudio amplifier 38. Plugs 40-42 vary with respect to size, materials, contact resistance, insulation, design, and pinout. Plugs 40-42 are made with silver, gold, platinum, or nickel plating reduce signal loss and improve signal quality. Plugs 40-42 generally have pins or prongs that are inserted into openings of a mating jack, socket, or other physical and electrical interface, and may include a locking mechanism for mechanical support. Plugs 40-42 can be keyed to ensure mating of the plug with the intended physical and electrical interface that matches the orientation of the plug. Plugs 40-42 are designed to reduce electromagnetic interference (EMI), radio frequency interference (RFI), and cross-talk. Common examples of plugs 40-42 used for audio applications include tip and sleeve (TS) ¼″ jacks, XLR connectors, RCA connectors, banana plugs, Speakon connectors, ⅛″ mini jacks, D-Sub cable connectors, musical instrument digital interface (MIDI) connectors, universal serial bus (USB) connectors, Sony Phillips digital interface (S/PDIF) connectors, firewire (IEEE 1394) connectors, Audio Engineering Society/European Broadcast Society (AES/EBU) connectors, Bayonet Neill-Concelman (BNC) connectors, and Tascam digital interface (TDFI) connectors. -
FIG. 4 a shows a cut-away view ofcable portion 52 made with a variety of materials, lengths, diameters or cross-sectional areas, and electrical specifications depending on the end application.FIG. 4 b is a cross-sectional view ofcable portion 52. Aninner conductor 56 transmits the audio signal through a solid material or twisted strands. Theinner conductor 56 can be copper (Cu), oxygen-free Cu (OFC), crystal oxygen-free copper (LC-OFC), electrolytic tough pitch (ETP) Cu, annealed Cu, silver (Ag), gold (Au), aluminum (Al), tin (Sn), nickel (Ni), alloys thereof, or other metal. In one embodiment,inner conductor 56 uses 8-10 Cu strands or wires which are spun, woven, or twisted together to a width or diameter of 16-20 gauge (0.81-1.29 millimeters (mm)). The twisting pattern ofinner conductor 56 should be uniform and tight to bring the strands in close proximity to one another to increase noise rejection. Alternatively,inner conductor 56 is a single solid conductor. An inner insulating or dielectric layer orsleeve 58 is formed overinner conductor 56. The inner insulatinglayer 58 can be poly(vinyl chloride) (PVC), neoprene, nylon, polyethylene, polypropylene, carbon impregnated plastic, silicone rubber, polytetrafluoroethylene (PTFE), ethylene propylene rubber (EPR), ethylene propylene polymer (EPM), ethylene propylene diene polymer (EPDM), ethylene alkene co-polymer (EAM), or other plastic or polymer material extruded overinner conductor 56. The inner insulatinglayer 58 provides structural support, protection, and flexibility, as well as maintaining spacing and electrically isolation ofinner conductor 56 with respect to shieldingconductor 60. - A shielding
conductor 60 is formed over inner insulatinglayer 58 as a ground conductor and shield for EMI, RFI, and cross-talk isolation.Shielding conductor 60 can be spiral, braided, or foil Cu, Ag, Au, Al, Sn, Ni, alloys thereof, or other metal. In one embodiment, shieldingconductor 60 uses braided Cu strands to form a sheath around inner insulatinglayer 58. Braided shielding is durable, flexible, and effective for protectingcable portion 52 against rough handling or physical interaction (bending, pulling, and stepping on) often imposed upon audio cables. Alternatively, spiral wrapped shielding involves wrapping one or more wire strands in a spiral around inner insulatinglayer 58. Foil shielding is a mylar-backed aluminum tube with a copper drain wire connected at each end. Foil shielding is typically used for cables that are stationary and involve minimal physical interaction, such as a patch cable.Shielding conductor 60 provides EMI, RFI, and cross-talk isolation to reduce noise or degradation of the electronic signals transmitted throughinner conductor 56. An outer insulating or dielectric layer orsleeve 62 is formed over shieldingconductor 60. The outer insulatinglayer 62 can be PVC, neoprene, nylon, polyethylene, polypropylene, carbon impregnated plastic, silicone rubber, PTFE, EPR, EPM, EPDM, EAM, or other plastic or polymer material extruded over shieldingconductor 60. The outer insulatinglayer 62 provides structural support, protection, and flexibility, as well as maintaining spacing and electrical isolation of the shielding conductor. Anouter jacket 64 is formed over outer insulatinglayer 62 for protection from mechanical stress, moisture, heat, and chemical exposure and to enhance the texture or feel ofaudio cable 36. In one embodiment,outer jacket 64 is a woven cloth material such as nylon or polyester.Outer jacket 64 facilitates identification ofaudio cable 36 by marking, pattern, and color. -
Cable portion 52, includinginner conductor 56, inner insulatinglayer 58, shieldingconductor 60, outer insulatinglayer 62, andouter jacket 64, has a diameter of 6-8 mm and properties of flexibility, tangle resistant, handling noise abatement, and physical durability.Cable 36 has a length ranging from 0.3-8.0 meters (m) and can be used in audio and video (A/V) applications and transmit analog or digital signals. A/V cable 36 uses a variety of connectors or plugs depending on the application and the signal being transmitted through the cable.Cable 36 can be used as an instrument cable, speaker cable, patch cable, microphone cable, snake cable, XLR cable, DIN cable, and AES3 cable. Some types of cables, e.g., high-definition multimedia interface (HDMI), firewire, digital media port, and coaxial cables, are capable of carrying both audio and video signals simultaneously. - Signal quality in
audio cables audio cable 36,inner conductor 56 is cryogenically treated to align to its molecular structure.FIG. 5 illustrates cryogenic chamber ortank 70 including aninterior space 72 of sufficient volume to hold multipleaudio cables 36, includingcable portion 52 and plugs 40-42. In one embodiment,audio cables 36 are hung or disposed vertically withininterior space 72, as shown inFIG. 5 .Plug 40 is placed within a slot ofbracket 74 withcable portion 52 and plug 42 hanging down or extending vertically from the bracket. Alternatively, audio cables are disposed horizontally, either linearly or in a coil, on shelves withininterior space 72. Eachaudio cable 36 is physically separated from adjacent audio cables to allow all surface areas ofcable portion 52 and plugs 40-42 to be evenly and uniformly exposed to varying temperatures withincryogenic chamber 70. Aliquid nitrogen source 76 is connected toheat exchanger 78 byflow control valve 80 andconduit 82. Alternatively, the coolant source can be liquid helium or other coolant. The liquid nitrogen is converted to a gaseous state inheat exchanger 78. The super-cooled nitrogen gas is pumped intocryogenic chamber 70 throughpump 86 andconduit 88.Ventilation system 84 includes one or more fans to uniformly distribute the super-cooled nitrogen gas withininner space 72 ofcryogenic chamber 70 as a dry cryogenic treatment. -
Computer control system 90 controls the flow rate of liquid nitrogen intoheat exchanger 78 by way offlow control valve 80 to regulate the flow of nitrogen gas and control the temperature withincryogenic chamber 70.Computer control system 90 executes software configured for scheduling, monitoring, and implementing the phases of the cryogenic treatment profile. A sensor orthermocouple 92 withincryogenic chamber 70 monitors temperature within the chamber and continuously provides temperature readings tocomputer control system 90 bysensor connection 94. -
Audio cables 36 are subjected to a cryogenic treatment temperature profile to cryogenically treat the audio cable, includinginner conductor 56.FIG. 6 shows an example ofcryogenic treatment profile 100. At time t0, the temperature withininner space 72 ofcryogenic chamber 70 is temp0=21° C. (ambient temperature).Audio cables 36 are placed ontobracket 74 withininner space 72 ofchamber 70.Computer control system 90 sets flowcontrol valve 80 to release liquid nitrogen intoheat exchanger 78. Super-cooled nitrogen gas is pumped throughventilation system 84 intocryogenic chamber 70 to uniformly distribute the coolant to all surface areas ofcable portion 52 and plugs 40-42. Between time t0 and t1 ofcryogenic treatment profile 100, the temperature withininner space 72 ofcryogenic chamber 70 decreases from temp0 to temp1=−157° C. to −184° C. In one embodiment, the temperature withininner space 72 ofcryogenic chamber 70 linearly ramps down from temp0 to temp1=−173° C. to −184° C. The time between t0-t1 ofcryogenic treatment profile 100 is about a 12 hour period to avoid thermal shock, residual stress, and formation of cracks inaudio cable 36. Between time t1 and t2 ofcryogenic treatment profile 100, the temperature withininner space 72 ofcryogenic chamber 70 is held steady state at temp1 for an 8-12 hour period. Between time t2 and t3 ofcryogenic treatment profile 100, the temperature withininner space 72 ofcryogenic chamber 70 increases or linearly ramps up from temp1 back to temp0 (ambient temperature). The time between t2-t3 ofcryogenic treatment profile 100 is about an 8 hour period to return to ambient temperature while avoiding thermal shock, residual stress, and formation of cracks inaudio cable 36. In some embodiments, the temperature withininner space 72 ofcryogenic chamber 70 is optionally increased above temp0, e.g., to temp2=30-50° C. after time t3 and returns to ambient temperature at time t4. The temperature incryogenic chamber 70 remains uniform throughoutinner space 72 during each phase ofcryogenic treatment profile 100. After time t3 or t4,audio cable 36 is removed fromcryogenic chamber 70. -
FIG. 7 shows anothercryogenic treatment profile 110. At time t0, the temperature withininner space 72 ofcryogenic chamber 70 is temp0=21° C. (ambient temperature).Audio cables 36 are placed ontobracket 74 withininner space 72 ofchamber 70.Computer control system 90 sets flowcontrol valve 80 to release liquid nitrogen intoheat exchanger 78. Super-cooled nitrogen gas is pumped throughventilation system 84 intocryogenic chamber 70 to uniformly distribute the coolant to all surface areas ofcable portion 52 and plugs 40-42. Between time t0 and t1 ofcryogenic treatment profile 110, the temperature withininner space 72 ofcryogenic chamber 70 decreases in discrete orstaggered steps 112 from temp0 to temp1=−157° C. to −184° C. or from temp0 to temp1=−173° C. to −184° C. In one embodiment, the temperature withininner space 72 decreases by a 50° C. step from temp0 to −29° C. and then held steady state at −29° C. for 1-2 hours. The temperature withininner space 72 is stepped down by another 50° C. and then held there steady state for 1-2 hours. The process repeats until temp1 is reached, as shown bysteps 112 between time t0-t1. The time between t0-t1 ofcryogenic treatment profile 110 is about a 12 hour period to avoid thermal shock, residual stress, and formation of cracks inaudio cable 36. Between time t1 and t2 ofcryogenic treatment profile 110, the temperature withininner space 72 ofcryogenic chamber 70 is held steady state at temp1 for an 8-12 hour period. Between time t2 and t3 ofcryogenic treatment profile 110, the temperature withininner space 72 ofcryogenic chamber 70 increases in discrete orstaggered steps 114 from temp1 back to temp0 (ambient temperature). In one embodiment, the temperature withininner space 72 is increased by a 50° C. step from temp1 and then held there steady state for 1-2 hours. The temperature withininner space 72 is stepped up by another 50° C. and then held there steady state for 1-2 hours. The process repeats from temp0 to temp1, as shown bysteps 114 between time t2-t3. The time between t2-t3 ofcryogenic treatment profile 110 is about an 8 hour period to return to ambient temperature while avoiding thermal shock, residual stress, and formation of cracks inaudio cable 36. In some embodiments, the temperature withininner space 72 ofcryogenic chamber 70 is optionally increased above temp0, e.g., to temp2=30-50° C. after time t3 and returns to ambient temperature at time t4. The temperature incryogenic chamber 70 remains uniform throughoutinner space 72 during each phase ofcryogenic treatment profile 100. After time t3 or t4, audio cable is removed fromcryogenic chamber 70. - In another embodiment,
inner space 72 ofcryogenic chamber 70 is pre-cooled to temp1=−173° C. to −184° C. prior to placement ofaudio cables 36 into the chamber. Once temp1 is reached,audio cables 36 are placed withininner space 72 ofcryogenic chamber 70. The remainder of the process followscryogenic treatment profile - Cryogenic treatment of
audio cable 36 realigns the molecular structure ofinner conductor 56 to increase electron mobility while enhancing the structural and conductive properties of the inner conductor. The molecules ofinner conductor 56 compact by removing gaps and impurities, such as oxygen, to achieve more homogeneity of variance in the molecular structure, i.e., increase the density of the molecular structure. The cryogenically treatedaudio cable 36 exhibits enhanced electrical properties including lower resistance, greater signal frequency response, reduced frequency spikes, higher signal quality, and faster signal propagation speed, while achieving longer cable runs and noticeably improved audible quality. The cryogenically treatedaudio cable 36 achieves a high degree of balance, maintain a full range frequency response, provide smooth separation, fine dynamics, and preserve the electrical signals transmitted through the cable to faithfully reproduce the original sound content. In addition, the cryogenically treatedaudio cable 36, including components ofcable portion 52 and plugs 40-42, exhibit improved wear resistance, stress relief, abrasion and fatigue resistance, yield strength, tensile strength, impact strength, hardness, thermal conductivity, and elastic modulus. - In another embodiment, bare
inner conductor 56, i.e., prior to formation of inner insulatinglayer 58, shieldingconductor 60, outer insulatinglayer 62, andouter jacket 64, are placed withininterior space 72 ofcryogenic chamber 70. In one embodiment,inner conductors 56 wound inspools 116 are disposed onshelves 118 withininterior space 72, as shown inFIG. 8 . Theinner conductors 56 are subjected tocryogenic treatment profile FIGS. 6-7 . After treatment,inner conductor 56 can be formed asaudio cable 56, as described inFIGS. 3-4 . - Cryogenic treatment of
inner conductor 56 realigns the molecular structure to increase electron mobility while enhancing the structural and conductive properties of the inner conductor. The molecules ofinner conductor 56 compact by removing gaps and impurities such as oxygen to achieve more homogeneity of variance in the molecular structure, i.e., increase the density of the molecular structure. The cryogenically treatedinner conductor 56 exhibits enhanced electrical properties including lower resistance, greater signal frequency response, reduced frequency spikes, higher signal quality, and faster signal propagation speed, while achieving noticeably improved audible quality. The cryogenically treatedinner conductor 56 achieves a high degree of balance, maintains a full range frequency response, provides smooth separation, fine dynamics, and preserves the electrical signals transmitted through the cable to faithfully reproduce the original sound content. -
FIG. 9 illustrates amagnetic pickup 120 for mounting to the body ofguitar 30.Pickup 120 includes apermanent magnet 122 withinbobbin 124 which is wrapped bywire 126.Permanent magnet 122 magnetizesstrings 34 to produce a signal inwire 126 as the string vibrates.Wire 126 can be Cu, Ag, Au, Al, Sn, Ni, alloys thereof, or other metal. The assembledpickup 120 withwire 126, or justbare wire 126, is placed withininterior space 72 ofcryogenic chamber 70, similar toFIGS. 5 and 8 .Wire 126 is subjected tocryogenic treatment profile FIGS. 6-7 . In another embodiment, the cryogenically treated wire can be used in a speaker voice coil, microphone, instrument string, and A/V cabling. In each case, cryogenic treatment of the conductor realigns the molecular structure to increase electron mobility while enhancing the structural and conductive properties of the conductor. The molecules of the conductor compact by removing gaps and impurities such as oxygen to achieve more homogeneity of variance in the molecular structure, i.e., increase the density of the molecular structure. The cryogenically treated conductor exhibits enhanced electrical properties including lower resistance, greater signal frequency response, reduced frequency spikes, higher signal quality, and faster signal propagation speed. - While one or more embodiments of the present invention have been illustrated in detail, the skilled artisan will appreciate that modifications and adaptations to those embodiments may be made without departing from the scope of the present invention as set forth in the following claims.
Claims (25)
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US14/137,329 US20150176890A1 (en) | 2013-12-20 | 2013-12-20 | Cryogenically Treated Audio/Video Cable and Method Thereof |
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US14/137,329 US20150176890A1 (en) | 2013-12-20 | 2013-12-20 | Cryogenically Treated Audio/Video Cable and Method Thereof |
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US20150176890A1 true US20150176890A1 (en) | 2015-06-25 |
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US14/137,329 Abandoned US20150176890A1 (en) | 2013-12-20 | 2013-12-20 | Cryogenically Treated Audio/Video Cable and Method Thereof |
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Cited By (5)
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US20160172805A1 (en) * | 2014-12-10 | 2016-06-16 | Piotr Nawrocki | Security Cable |
US20170238114A1 (en) * | 2016-02-16 | 2017-08-17 | Sony Corporation | Wireless speaker system |
US9924291B2 (en) | 2016-02-16 | 2018-03-20 | Sony Corporation | Distributed wireless speaker system |
US11290797B2 (en) * | 2018-07-30 | 2022-03-29 | Prophet Productions, Llc | Intelligent cable adapter digital signal processing system and method |
US11443737B2 (en) | 2020-01-14 | 2022-09-13 | Sony Corporation | Audio video translation into multiple languages for respective listeners |
-
2013
- 2013-12-20 US US14/137,329 patent/US20150176890A1/en not_active Abandoned
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US20160172805A1 (en) * | 2014-12-10 | 2016-06-16 | Piotr Nawrocki | Security Cable |
US9825413B2 (en) * | 2014-12-15 | 2017-11-21 | Piotr Nawrocki | Security cable |
US20170238114A1 (en) * | 2016-02-16 | 2017-08-17 | Sony Corporation | Wireless speaker system |
US9924291B2 (en) | 2016-02-16 | 2018-03-20 | Sony Corporation | Distributed wireless speaker system |
US11290797B2 (en) * | 2018-07-30 | 2022-03-29 | Prophet Productions, Llc | Intelligent cable adapter digital signal processing system and method |
US11758311B2 (en) | 2018-07-30 | 2023-09-12 | Prophet Productions, Llc | External controller for an intelligent cable or cable adapter |
US11443737B2 (en) | 2020-01-14 | 2022-09-13 | Sony Corporation | Audio video translation into multiple languages for respective listeners |
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