the present invention has been described with respect to particular exemplary embodiments and with reference to certain drawings , but the invention is not limited thereto , but rather , is set forth only by the appended claims . the drawings described are only schematic and are non - limiting . in the drawings , for illustrative purposes , the size of some of the elements may be exaggerated and not drawn to a particular scale . where the term “ comprising ” is used in the present description and claims , it does not exclude other elements or steps . where an indefinite or definite article is used when referring to a singular noun , e . g . “ a ” “ an ” or “ the ”, this includes a plural of that noun unless something otherwise is specifically stated . hence , the term “ comprising ” should not be interpreted as being restricted to the items listed thereafter ; it does not exclude other elements or steps , and so the scope of the expression “ a device comprising items a and b ” should not be limited to devices consisting only of components a and b . this expression signifies that , with respect to the present invention , the only relevant components of the device are a and b . furthermore , the terms “ first ”, “ second ”, “ third ” and the like , if used in the description and in the claims , are provided for distinguishing between similar elements and not necessarily for describing a sequential or chronological order . it is to be understood that the terms so used are interchangeable under appropriate circumstances ( unless clearly disclosed otherwise ) and that the exemplary embodiments of the invention described herein and may be operated in other sequences and / or arrangements than are described or illustrated herein . to aide in an understanding of the present invention , an artisan should understand and appreciate that the terms “ main processor ” and sub - processor ” are terminologies used for understanding of the invention , but other terminologies can be interchangeably used in place of main processor and sub - processor having the same meaning . for example , to aid the artisan , the term “ main processor ”, can be any one of an “ application processor ”, “ ap ”, “ first processor ”, and “ processor 1 ” as used herein all refer to the same processor 110 that is shown in fig1 . a high power processor can be referred to as a main processor , or an application processor . the main processor typically is considered high power relative to the low power sub - processor or sensing processor . in addition , the term “ sub - processor ”, can be any one of a “ sensing processor ”, “ mcu ”, “ second processor ”, “ processor 2 ”, “ sensor hub ( processor )”, mcu ( micro controller unit ”, i refer to the same processor 120 that is shown in fig1 . an ultra - low power processor can be referred to as any of the above . an artisan understands and appreciates that the term “ ultra - low power ” typically refers to a processor operating at power consumption values using less than approximately 1 ma , and often in the μa range . “ ultra - low power levels ” refers to power consumption at levels using less than approximately 1 ma . in addition , the artisan also understands and appreciates that the term “ low power ” typically refers to a processor ( or sub - processor ) operating in the 1 - 10 ma range . the apparatus may comprise a wireless communication device , such as a mobile communication terminal , a cellphone , smart phone , tablet , personal digital assistant ( pda ), notebook , netbook , etc . just to name a few possible non - limiting examples of devices . fig1 shows a block diagram of an exemplary depiction of an apparatus 100 according to an exemplary aspect of the invention that includes a main processor ( hp for high power ) that is typically an application processor , a sub - processor 120 ( lp for low power ) that receives information from sensors such as interrupt ulp sensor 130 ( ultra - low power ) and a polling 140 ( that may or may not be ultra - low power ). the sub - processor 120 operates at a low power or ultra - low power , and according to the present invention , the sub - processor can remain in a sleep mode along with the main processor 110 because of the use of an interrupt sensor 130 . as discussed herein above , the conventional apparatus uses only a polling sensor that requires either the main processor or the sub - processing to remain fully operational to be able to have the device change from sleep mode to operational mode . the interrupt sensor 130 operates at ultra - low power levels and sends an interrupt signal to the sub - processor 120 when a predetermined condition is sensed , which can be , for example , waiving one &# 39 ; s hand in front of the display , shaking the device , or moving a piece of the device , such as shifting a position of a stylus 475 ( fig4 ) or part of the cover . according to the present invention , the interrupt sensor 130 is operable while the sub - processor 120 is in sleep mode . however , the polling sensor 140 requires the sub - processor to be in awake mode or operating mode ( not in sleep mode ). fig2 shows a flowchart illustrating an exemplary operation for gesture sensing according to an exemplary aspect of the invention . at step 200 , the main processor 110 and sub - processor 120 are in sleep mode . at steps 210 and 220 , an interrupt sensor 130 ( including but not limited to an infrared ( ir ) sensor ) detects gesture sensoring within a proximity distance of the electronic device , typically a display or touchscreen . the proximity distance can be , for example , 10 - 15 cm , but the invention does not require a specific distance , so long as the sensor can recognize the wave of the user &# 39 ; s hand . at step 230 , the sub - processor 120 is awakened by the interrupt signal sent from the interrupt sensor 130 . alternatively , at step 240 an accelerometer may detect the device being shaken or waived , and also cause the sub - processor 120 to be awakened . at step 250 , the sub - processor determines whether or not the sensed data from the interrupt sensor 130 is valid by comparing the value with a table in storage . in addition , a polling sensor 130 can be optionally included so that when the mobile device is placed in a case or bag , the interrupt sensor does not unintentionally operate . accordingly , the sub - processor wakes up due to the interrupt from the interrupt sensor , and the main processor wakes up when 1 ) sensing data of the interrupt sensor is within valid range or 2 ) when sensing data of the polling sensor is within the valid range , with 1 ) or 2 ) being determined by the sub - processor at step 250 . after determining by the sub - processor 120 that the data is valid , for example , by being in a valid range , or has reached a predetermined threshold , the sub - processor 120 at step 260 then wakes the main processor 110 , which in turn at step 270 provides feedback to the user , in the form of , for example , unlocking the screen , prompting the user , making the display operable , showing a home screen , etc . according to an exemplary aspect of the present invention , the predetermined threshold could be a particular value which if the output is greater than or equal to , is determined by the sub - processor as satisfying the wake up condition ( s ). in addition , there can be a range of range of values received from the sensor that are predetermined as satisfying a wakeup condition , that being provided only for purposes of illustration and not for limiting the appended claims , such as , for example a microvolt uv ( or microamp ua ) range . any other such range ( e . g . ma ) that is within the capability of the sub - processor to distinguish between values received from the sensor so as ascertain a valid range or predetermined threshold are within the spirit and scope of the claimed invention . fig3 a shows a flowchart illustrating an exemplary operation of a feedback voice input based on device &# 39 ; s motion according to an exemplary aspect of the invention . this particular exemplary embodiment starts at step 300 with the main processor and sub - processor being asleep . a motion detector detects motion at step 310 , by sensing the predetermined condition ( in this example is the device being shaken or waved ) at step 320 , and the interrupt signal is sent to the sub - processor 120 to wake up the sensing processor at step 330 . then the sub - processor at step 340 determines whether or not the sensed data is valid , by comparing with values in storage to determine if the data is within a valid range or has reached a predetermined threshold , for example . upon determining that the sensed data from the interrupt sensor is valid , then at step 350 the sub - processor 120 wakes up the main processor 110 . the main processor can be fully operable and wait , for example , for a voice input ( step 360 ), and based on the determined voice input , can either unlock the display screen or execute a function or application ( step 370 ). for further purposes of illustration and not to limit the claimed invention , exemplary protocol between the main processor and sub - processor is discussed herein . the protocol for transmitting is in accordance with the main processor and sub - processor &# 39 ; s active or sleep state . as shown in fig3 b , while the main processor is active , an exchange occurs between main processor and a sub - processor according to a hub protocol . first , a hub interrupt is sent by the main processor to the sub - processor , and wherein the main processor starts to send length information . in turn , the sub - processor sends an acknowledgement back to the main processor . at this point , the hub ( sub - processor ) sets the control right and ap sleep information . with continued reference to fig3 b , it can be seen that the sub - processor keeps varying states between active and sleep . when a situation arise where the main processor needs to be awakened , an ap interrupt id from the sub - processor to the main processor . once the main processor is awakened , the main processor remains in an active state and starts to send information to the sub - processor . in turn , the sub - processor indicates to the main processor the data length to send . next the main processor starts to read a message from sub - processor , which can comprise sensor data and sub - processed data . fig3 c shows an example of a main processor to sub - processor ( i . e . ap to hub protocol message frame ) that can be used according to an exemplary aspect of the present invention . referring now to fig3 c , it is shown that an exemplary frame can be 8 bytes , with a command field commanded by the ap ( main processor ) to the hub ( sub - processor ), a sensor number field specifying a particular sensor , s data type showing the content of the operand being transmitted , a data size field providing the actual data that follows . each of the aforementioned parts of the message frame can be 1 byte in length , and the data and status can be 4 bytes each so as to total 8 bytes , for example . fig3 d shows another example of ap ( main processor ) to hub ( sub - processor protocol according to a non - limiting exemplary aspect of the present invention . these actions are similar to what is shown in fig3 b while the ap is in the active mode . fig4 shows a flowchart illustrating exemplary operation of a signature unlock based on stylus movement according to an exemplary aspect of the invention . with reference to fig4 , at step 400 , the main processor and sub - processor are in sleep mode . at step 410 , the presence of a stylus pen 475 is monitored to determine whether the stylus pen has been removed from a holder on the electronic device . at step 420 , when it is determined that the stylus pen is removed , sub - processor wakes up at 430 . if at step 440 , the non - input timer has expired , the main processor and sub - processor go back to sleep mode , otherwise , at step 450 it is determined whether a signature is valid , and if so , then main processor wakes up , and the display lcd is turned on and unlocked ( step 460 ). fig5 shows a current profiling example according to an exemplary aspect of the invention . in this particular non - limiting example , the x axis is time , and the y - axis is current consumption which comprises milliamps and microamps . as shown in fig5 , the ir gesture sensor ( interrupt sensor ) consumes at 317 . 5 ua of current . the sub - processor in this example consumes about 3 . 2 ua when awakened due to the ir gesture sensor sensing a change in the ambient condition . within about 330 ms of waking up the sub - processor may wake up the main processor to perform a function , and upon doing so , the sub - processor goes back to sleep . the main processor consumes considerably more current than the sub - processor . also , in the example of fig5 , it is shown that the accelerometer can cause the main processor to wake up within 180 ms . fig6 shows one possible example of a wireless device incorporating the present invention . an artisan understands and appreciates that a plurality of both wired and wireless devices can benefit from the claimed invention . some non - limiting examples include smartphone , tablet , pda , music player , etc . just to name a few examples . a controller includes the main processor 610 and a codec 617 , the controller communicates with sensing processor 620 . the interrupt sensor 630 and the polling sensor 640 are shown schematically , but their actual proximity to the controller us likely to be different than shown . touch screen 655 permits display and entry of data . storage device 685 is in communication with the controller , and comprises a non - transitory machine readable medium . auxiliary input 675 can be anything from a keyboard to a mouse , and wireless communication device , shown as a single box , may be different hardware modules for transmitting in short range communication such as near field communication , bluetooth , wlan , 802 . 11 , rf communications , etc . in the invention , the ambient environment is monitored by an interrupt sensor , so that the sub - processor and the main processor ( application processor ) can remain together in sleep mode . not only does the invention save power , but provides the user with a convenience in that there is no requirement to push a button to activate / convert the device from a sleep mode back to a normal operating mode . the sensing of a swiping near the device is sufficient to awake the device from sleep mode , or alternatively , shaking or waving the device , also restores the device to a normal operating state by waking it up . the above - described methods according to the present invention can be implemented in hardware , firmware or as software or computer code that can be stored in a recording medium such as a cd rom , an ram , a floppy disk , a hard disk , or a magneto - optical disk or computer code downloaded over a network originally stored on a remote recording medium or a non - transitory machine readable medium and to be stored on a local recording medium , so that the methods described herein can be rendered in such software that is stored on the recording medium using a general purpose computer , or a special processor or in programmable or dedicated hardware , such as , flash , an asic or fpga . as would be understood in the art , the computer , the processor , microprocessor controller or the programmable hardware include memory components , e . g ., ram , rom , flash , etc . that may store or receive software or computer code that when accessed and executed by the computer , processor or hardware implement the processing methods described herein . in addition , it would be recognized that when a general purpose computer accesses code for implementing the processing shown herein , the execution of the code transforms the general purpose computer into a special purpose computer for executing the processing shown herein .