Patent Application
20120215363
This application is the first disclosure of this invention.
(a) Field
The subject matter disclosed generally relates to the field of motion-enabled chairs.
(b) Related Prior Art
Motion-enabled chairs are becoming more and more popular in theatres. An example of such motion-enabled chairs is described in co-owned U.S. Patent Publication No. 20100090507 entitled Motion-Enabled Movie theatre Seat, which is incorporated herein by reference in its entirety.
Generally, motion-enabled chairs include one or more actuators connected to the base of the seat to produce vibrations and movements which are synchronized with and corresponding to the events displayed on the screen. The motion-enabled chairs are usually installed in a building and controlled by a central controller to induce and synchronize the vibrations/movements with the events displayed on the screen. A broad definition of motion-enabled chairs also includes tactile transducers and inertial shakers. This description therefore applies to such devices.
While advantageous and fun to use, when two or more motion-enabled chairs are provided on a certain platform, the vibration of these motion-enabled chairs add up and may damage the foundation of the building especially at the resonance frequency.
In particular, since all the motion-enabled chairs are synchronized with each other, when a certain event occurs on the screen which triggers the production of vibrations in the motion-enabled chairs, e.g. a car driving on an unpaved road, etc., all the motion-enabled chairs would vibrate in the same manner so that the users obtain the same feeling. Depending on the number of motion-enabled chairs and the floor on which the motion-enabled chairs are installed, the resulting vibration may damage the foundation or transfer the vibrations to other floors.
Therefore, there is a need for a system and method for controlling the movements of motion-enabled chairs to reduce the resulting vibration, without affecting the user's enjoyment and/or experience.
According to an embodiment, there is provided a method for controlling an intensity of a vibration resulting from a set of motion-enabled chairs receiving motion signals that are synchronized. The method comprising: selecting, from the set, one or more motion-enabled chairs to control; and altering motion signals for the selected motion-enabled chairs to de-phase the vibration of the selected motion-enabled chairs from the vibration of non-selected motion-enabled chairs, thereby reducing the intensity of the vibration resulting from the set of motion-enabled chairs.
According to another embodiment, there is provided a central transmitter for controlling an intensity of a vibration resulting from a set of motion-enabled chairs receiving motion signals that are synchronized. The central transmitter comprising:
According to another embodiment, there is provided a set of motion-enabled chairs attached to a structure and configured for reducing, in the structure, an intensity of a vibration resulting from movement of the set of motion-enabled chairs receiving motion signals. The set of motion-enabled chairs comprising:
Features and advantages of the subject matter hereof will become more apparent in light of the following detailed description of selected embodiments, as illustrated in the accompanying figures. As will be realized, the subject matter disclosed and claimed is capable of modifications in various respects, all without departing from the scope of the claims. Accordingly, the drawings and the description are to be regarded as illustrative in nature, and not as restrictive and the full scope of the subject matter is set forth in the claims.
Further features and advantages of the present disclosure will become apparent from the following detailed description, taken in combination with the appended drawings, in which:
It will be noted that throughout the appended drawings, like features are identified by like reference numerals.
In a building equipped with a plurality of motion-enabled chairs such as a movie theatre, the vibrations of the motion-enabled chairs add up and may damage the foundation of the building especially at the resonance frequency. The present application describes a system and method for controlling the resulting vibration by introducing an alteration such as a delay or an inversion in the motion signals sent to the motion-enabled chairs. This delay causes the vibration of some motion-enabled chairs to be de-phased from the vibration of the other motion-enabled chairs. Whereby, the intensity (magnitude) of the resulting vibration is reduced. Control of the motion-enabled chairs may be performed centrally through a central controller, or locally at selected motion-enabled chairs.
The motion-enabled chair includes one or more actuators 106 connected to the seat base 102, and a controller (not shown) to receive motion signal from a central transmitter 300 and interpret and transform the motion signal into drive signals for driving each actuator 106. The central transmitter 300 receives or generates the motion signal in accordance with the video and or audio signals of a feature length movie. In an embodiment, motion-enabled chair 100 comprises three actuators 106, two of which are not shown in
Below the right armrest 104, a control panel 107 is accessible to the user for controlling the intensity (e.g., the amplitude range of the actuators 106) of the motion effect inducing in the motion-enabled chair 100. Some of the options (i.e., modes of operation) include “Off” (i.e., no motion), “Light” (i.e., reduced motion), “Normal” (i.e., regular motion), “Heavy” (i.e., maximum motion), “Discreet” (i.e., fully controllable motion level between “Off” and “Heavy”), and “Automatic”. In the “Automatic” mode, the motion-enabled chair 100 uses a sensor (not shown) to detect a characteristic of the user (e.g., weight, height, etc.) and, based on the characteristic, determines the setting for the level of motion that will be induced in the motion-enabled chair 100.
The present embodiments aim at reducing the vibration resulting from a plurality of motion-enabled chairs 100 without effecting any hardware change to the motion-enabled chairs 100. It is also an object to reduce the resulting vibration of the motion-enabled chairs 100 in a manner that is un-noticeable by the user. Therefore, it is important to maintain the user's experience and enjoyment on the motion-enabled chair they occupy while at the same time not letting them notice any delay or difference in the movement between the motion-enabled chair they occupy and a neighboring motion-enabled chair. Therefore, at low frequencies all the motion-enabled chairs may move in the same manner especially such that the resulting vibration is negligible and causes no harm. The delay or inversion may be introduced, where appropriate/needed at higher frequencies where the user cannot detect the difference in motion between the motion-enabled chair they are on and the neighboring motion-enabled chair. For example, it is possible that a delay introduced between the motion signals of neighboring motion-enabled chairs causes the motion signals to be the inverse of each other at a given frequency. In which case, the movement of one motion-enabled chair may be the opposite of the other e.g. one motion-enabled chair moving up and the other one moving down. However, because the vibrations occur at high frequencies, the user cannot notice the difference, and thus, the user's experience is not affected by the delay introduced.
In one aspect, movement of the different motion-enabled chairs is controlled centrally in the central transmitter 300 which generates de-phased motion signals and sends these signals to selected motion-enabled chairs or groups of motion-enabled chairs for controlling the resulting vibration of the motion-enabled chairs.
The system 250 comprises two (or more) motion-enabled chairs 100-1 and 100-2 (hereinafter motion-enabled chairs 100). The motion-enabled chairs 100 are mounted on a platform 260. The platform 260 may be the ground (e.g., concrete) or an actual board made of metal, plastic, wood or any other suitable material provided between the motion-enabled chairs and the ground. The controller of each of the motion-enabled chairs receives a motion signal from the central transmitter 300 to interpret and transform the motion signal into drive signals for driving each of the actuators 106 of the motion-enabled chair.
In order to reduce the resulting vibration of the motion-enabled chairs 100 on the platform 260, the central transmitter 300 introduces a delay between the motion signal of one motion-enabled chair and the motion signal of the other motion-enabled chair to de-phase the motion signals, whereby the resulting vibration (aka total vibration or sum of the vibrations) of the two motion-enabled chairs is reduced.
In an embodiment, the central transmitter computes a delay that cancels the total vibration at a certain frequency, e.g. the resonance frequency, and reduces the total vibration at the neighboring frequencies. In an embodiment, the delay T introduced is calculated in accordance with the following equation 1 in which F is the frequency at which the total vibration needs to be cancelled:
T=1/(2F) Equation 1:
The resonance frequency may vary between a building and the other depending on the number of floors, construction materials, etc. In an embodiment, the resonance frequency ranges between 10 Hz and 50 Hz. However, it is to be noted that the present embodiments are not limited to a certain frequency range.
In another embodiment, for a given frequency range (e.g., 10 Hz to 100 Hz), the motion signal input to one motion-enabled chair is the inverse of the motion signal input to the other motion-enabled chair, whereby the vibrations of one motion-enabled chair may be substantially cancelled by the other motion-enabled chair, and the resulting vibration transmitted to the ground is substantially eliminated.
Transmission of de-phased motion signals to the motion-enabled chairs 100 may be done in several ways.
In the embodiment shown in
According to an embodiment, the central transmitter 300 includes a sensor (not shown) for detecting and for selecting a frequency at which the vibration is to be reduced. The sensor can be in the central transmitter 300 cut it could also be located outside of the central transmitter 300. In an embodiment, the detected and selected frequency varies over time. The altering of the motion signal is therefore adjusted accordingly. In an embodiment, the sensor is for detecting an amplitude of a vibration at multiple frequencies. The sensor is further for selecting a frequency at which the vibration is to be reduced based on the amplitude of the vibration at a frequency from the multiple frequencies. The selected frequency can therefore be the one at which the amplitude of the vibration is the greatest, the one which produces the highest level of noise, or the one which would cause the greatest damage to the structure.
In the embodiments shown in
Demultiplexing of the multiplexed signal received on the link 256 may be done within the controller of each motion-enabled chair using a software program or using only a software modification as in the embodiment shown in
Another example of implementation is shown in
The motion signal is “daisy-chained” from one motion-enabled chair to the other. That is, the motion signals for all motion-enabled chairs are encoded by central transmitter 300 and sent on the same link 284 to motion-enabled chair 100-1. Motion-enabled chair 100-1 picks up its own motion signal while the same signal send on link 284 is repeated/transmitted on link 286 to motion-enabled chair 100-2. Motion-enabled chair 100-2 will pick up its own signal which is delayed relative to the signal for motion-enabled chair 100-1.
In an embodiment of the central control aspect, selection of the motion-enabled chairs is done on the basis of the weight of the occupants. As explained above, the motion-enabled chairs may be equipped with weight sensors to detect the weight of the user and report this information to the central transmitter 300. The central transmitter 300 receives the information from the plurality of motion-enabled chairs, and processes this information centrally to divide the motion-enabled chairs in groups where all the motion-enabled chairs in one group receive the same motion signal, wherein the motion signal sent to one group is de-phased from the motion signal sent to the other group. This will be exemplified in the non-limiting example shown in
With reference to
In another aspect, control of the movements and introduction of the delay is done locally at the motion-enabled chairs without changing the manner in which the central controller functions.
For example, it is possible that the controller of selected motion-enabled chairs introduces a delay to the motion signal received from the transmitter. The controller may be programmed to introduce the delay when detecting a pre-determined frequency. Alternatively, an external decoder may introduce the delay when detecting the pre-determined frequency. For example, the external decoder 268 of
As discussed above, a central transmitter 300 prepares the motion signals and forwards them to the motion-enabled chairs 100. In this embodiment, the motion signals are first sent to motion-enabled chair 100-1, then to motion-enabled chair 100-2, and so on until it reaches the last motion-enabled chair 100-8. Each motion-enabled chair 100 picks up the motion signals which are destined to it.
In the embodiment shown in
In another embodiment shown in
Now turning to
According to an embodiment, the altering of the motion signals comprises at least one of delaying the motion signals for all frequencies or a in given frequency range to the selected motion-enabled chairs (step 96) and inverting the motion signals in a given frequency range to the selected motion-enabled chairs (step 98).
While the drawings provided in this application illustrate only two motion-enabled chairs on each platform, it is to be noted that the design is not limited to only two motion-enabled chairs. Any number of motion-enabled chairs may be controlled as described in the present embodiments without departing from the scope of this disclosure.
According to another embodiment, it is to be noted that the design is also applicable to more than two platforms.
Furthermore, the term neighboring motion-enabled chair does not necessarily mean that the motion-enabled chairs have to be right beside each other. As discussed above, the motion-enabled chairs are generally equipped with a weight sensor. Therefore, when a motion-enabled chair is vacant the vibrations and/or movements would be disabled. Therefore, in the case where a vacant motion-enabled chair exists between two occupied motion-enabled chairs, the neighboring motion-enabled chairs could be the motion-enabled chairs that are occupied and not the vacant motion-enabled chairs.
It is also to be noted that the links on which the motion signals are sent may be selected from a wide variety of options available on the market. For example, the link may be a wired link such as a coaxial cable, fiber optic cable, CAT 5 cable, etc. or may be a wireless link including a transmitter at the central transmitter 300 and a receiver at some or all of the motion-enabled chairs.
Embodiments can be implemented as a computer program product for use with a computer system. Such implementation may include a series of computer instructions fixed either on a tangible medium, such as a computer readable medium (e.g., a diskette, CD-ROM, ROM, or fixed disk) or transmittable to a computer system, via a modem or other interface device, such as a communications adapter connected to a network over a medium. The medium may be either a tangible medium (e.g., optical or electrical communications lines) or a medium implemented with wireless techniques (e.g., microwave, infrared or other transmission techniques). The series of computer instructions embodies all or part of the functionality previously described herein. Those skilled in the art should appreciate that such computer instructions can be written in a number of programming languages for use with many computer architectures or operating systems. Furthermore, such instructions may be stored in any memory device, such as semiconductor, magnetic, optical or other memory devices, and may be transmitted using any communications technology, such as optical, infrared, microwave, or other transmission technologies. It is expected that such a computer program product may be distributed as a removable medium with accompanying printed or electronic documentation (e.g., shrink wrapped software), preloaded with a computer system (e.g., on system ROM or fixed disk), or distributed from a server over the network (e.g., the Internet or World Wide Web). Of course, some embodiments of the invention may be implemented as a combination of both software (e.g., a computer program product) and hardware. Still other embodiments of the invention may be implemented as entirely hardware, or entirely software (e.g., a computer program product).
According to another embodiment, an instruction signal (e.g., instructions, metadata information) which accompanies the motion signals gives instructions to the chairs (i.e., on selected chairs or all chairs depending on the instruction signal). The instruction signal may include instructions for 1—reducing the volume to be played in advance of the motion signal to avoid locally processing the instruction signal thereby avoiding unnecessary processing delays; 2—cutting out the selected frequency (or given frequency range); or 3—mixing high frequencies and low frequencies.
While preferred embodiments have been described above and illustrated in the accompanying drawings, it will be evident to those skilled in the art that modifications may be made without departing from this disclosure. Such modifications are considered as possible variants comprised in the scope of the disclosure.
