CN104049707A - Always-on Low-power Keyword Spotting - Google Patents
Always-on Low-power Keyword Spotting Download PDFInfo
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- CN104049707A CN104049707A CN201410095054.0A CN201410095054A CN104049707A CN 104049707 A CN104049707 A CN 104049707A CN 201410095054 A CN201410095054 A CN 201410095054A CN 104049707 A CN104049707 A CN 104049707A
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Abstract
The invention relates to always-on low-power keyword spotting, in particular to an electronic device that includes a wake-up system that operates at a substantially low power level and is applied to wake up the electronic device from a sleep mode. The wake-up system comprises a sound transducer that converts a received sound signal to an electrical signal and a keyword detection logic that preliminarily identifies a speech energy profile that corresponds to at least one of a plurality of keywords in a part of the electrical signal. In some embodiments, a keyword finder is further activated to identify with an enhanced accuracy whether the at least one keyword exists in the part of the electrical signal, and generates a wake-up control to activate a host of the electronic device from its sleep mode.
Description
The cross reference of related application
It is 61/790 that the application requires according to 35U.S.C. § 119 (e) sequence number of submitting on March 15th, 2013,760, title is the rights and interests of the provisional application of " Always-On Low-Power Keyword Spotting ", and the theme of this provisional application is all incorporated to herein by reference.
Technical field
The present invention relates to electronic equipment, and relate more specifically to system, equipment and method that the main frame of electronic equipment is waken up from its dormancy or sleep state.
Background technology
Nearly all electronic equipment is all reserved sleep pattern, standby mode or park mode, some of them---if not all---, and program is inactive, and processing unit as much as possible remains in dormant state.These patterns are by stopping using (deactivate) unwanted subsystem and only necessary data storage is retained in and significantly saves electric consumption in some random-access memory (ram)s.Because whole world number of electronic devices is in use huge, can be by saving the energy of huge amount by these energy saving patterns.And these energy saving patterns are for example, to battery-operated equipment (mobile device) crucial especially, not only because these equipment as following trend just by more prevalent application, and because the battery charging appreciable impact user of these equipment is experienced.Sleep pattern extending battery life also reduces charge frequency, and the user who has also greatly improved battery-operated equipment except the general benefit of energy saving experiences.
Most of electronic equipments stop sleep, standby or park mode, and turn back to normal running when receive notice from equipment user.Equipment user usually must transmit them and need to use by the hardware button on electronic equipment the notice of equipment.For example, most of personal computers depend on that waking up of power knob pressed or keyboard on click wake up.Although rolling mouse is also enough to activating computing machine now, awakening method need to be touched by equipment user's physics conventionally, but such touch always can not be used.For example, it is almost impossible waking the mobile phone that is positioned at the sleep outside the distance that arm can reach up, particularly in the time of equipment user skipper automobile.Therefore, existence still maintains the needs of low power consumption simultaneously during sleep pattern to remotely waking the electronic equipment of sleep up.
Summary of the invention
Various embodiment of the present invention relates to electronic equipment, and has related more specifically to merge system, equipment and the method for waken system, operation the main frame of electronic equipment is waken up from sleep pattern under the substantially low power level of waken system.
According to one embodiment of present invention, waken system comprises the keyword search logical block that received acoustical signal is converted to the acoustic transducer of electric signal and (preliminarily) identification in advance and at least one the corresponding speech energy distribution (speech energy profile) in multiple key words in a part for electric signal.In certain embodiments, keyword search device (keyword finder) is further activated and identifies in this part whether at least one key word be present in electric signal with the accuracy improving, and produces to wake up and control that the main frame of electronic equipment is activated from its sleep pattern.
According to another embodiment of the present invention, can apply the method that electronic equipment is waken up from sleep pattern.Convert the acoustical signal being received by acoustic transducer to electric signal.Be distributed in corresponding at least one the speech energy in multiple key words in the part of electric signal and identified in advance, and keyword search device is activated further at least one the multiple key words of identification of accuracy to improve in fact subsequently from sleep pattern.Based on so in advance and accurately keyword recognition, wake up to control and produced that the main frame of electronic equipment is activated from sleep pattern.
Some feature and advantage of the present invention have been described in general manner in this summary of the invention part; But, extra feature, advantage and embodiment be presented in this article or to those skilled in the art with reference to the accompanying drawings, instructions and claim thereof will be obvious.Therefore, should be understood that scope of the present invention should not limited by disclosed specific embodiment in this summary of the invention.
Brief description of the drawings
With reference to embodiments of the invention, its example can be shown in the drawings.These accompanying drawings are for explanation instead of restriction.Although the present invention is described conventionally in the background of these embodiment, should be understood that it and be not used in to limit the scope of the present invention to these specific embodiment.
The example block diagram of the electronic equipment based on waken system of the various embodiments of Fig. 1 in illustrating according to the present invention.
Another example block diagram of the electronic equipment based on waken system of the various embodiments of Fig. 2 in illustrating according to the present invention.
The method that electronic equipment is waken up from sleep pattern of the various embodiments of Fig. 3 in illustrating according to the present invention.
Embodiment
In the following description, for the object of explaining, set forth specific details to the understanding of the present invention is provided.But it will be readily apparent to one skilled in the art that the present invention can be implemented in the situation that there is no these details.Those skilled in the art will recognize that, can also carry out embodiments of the invention described below with various devices in every way.Those of skill in the art also will appreciate that, extra amendment, application and embodiment are within the scope of it, as the extra field that the present invention can provide effectiveness.Therefore, embodiment described below illustrates specific embodiment of the present invention, and is intended to avoid making indigestion of the present invention.
In instructions, mentioning of " embodiment " or " embodiment " meaned to specific feature, structure, characteristic or the function described in conjunction with this embodiment comprise at least one embodiment of the present invention.The appearance in the difference places in instructions such as phrase " in one embodiment ", " in an embodiment " might not all refer to same embodiment.
In addition, be not limited in the connection between parts or between method step the connection directly realizing in the accompanying drawings.On the contrary, can be modified or change in other mode by adding intermediate member or method step to it in the connection between parts or between method step shown in the accompanying drawings, and do not depart from instruction of the present invention.
Various embodiment of the present invention relates to the electronic equipment that merges waken system, and relates more specifically to system, equipment and the method the main frame of electronic equipment remotely waken up from its dormancy, sleep or holding state by acoustical signal.User can send voice wake command to electronic equipment.In the time receiving order, waken system wakes the main frame of electronic equipment up from standby, sleep or park mode, and electronic equipment turns back to normal running thereafter.On the one hand, waken system can initiatively receive and processed voice wake command, even in the time that main frame is in dormant state.On the other hand, the power consumption of waken system is controlled in low in fact level, makes it not make the total power budget burden of electronic equipment heavy, particularly in the time of electronic equipment dormancy.
Electronic equipment adopts different activity levels to carry out conserve energy consumption better.For example, laptop computer has and the activity level of step-down and standby mode, sleep pattern and the park mode that the energy consumption of step-down is associated gradually gradually.Increasing program is disabled, and in the time of power level step-down, increasing hardware cell is deactivated.Standby mode can join with dark screen-dependent simply.In sleep pattern, the moment of machine state before entering sleep pattern is frozen, and data are temporarily stored in the RAM constantly being powered.But in park mode, such data can be backed up in hard disk, and RAM is also disabled to save more energy consumption.Various embodiment of the present invention is used to electronic equipment is waken up from all these energy saving patterns.For clear and simple, these patterns are commonly called sleep pattern in the present invention, even if they may relate to different activity levels.
Exemplary block Figure 100 of the electronic equipment based on waken system of the various embodiments of Fig. 1 in illustrating according to the present invention.Electronic equipment 100 comprises acoustic transducer 102, impact damper 104, keyword recognition device 106 and main frame 108.Acoustic transducer 102 is coupled into reception acoustical signal, and converts it to electric signal.A part for the acoustical signal of changing is buffered and is stored in impact damper 104 processing for subsequently.Keyword recognition device 106 is processed this part of changed acoustical signal, and identification target keywords generation wherein wakes control up.When identified in target keywords this part in changed acoustical signal, the main frame 108 that is coupled to keyword recognition device 106 is activated and turns back to its normal running.Particularly, acoustic transducer 102, impact damper 104 and keyword recognition device 106 form waken system 110, and it is for waking the main frame 108 of electronic equipment 100 up.
In various embodiment of the present invention, waken system 110 is made response active host 108 to multiple key words, and electronic equipment 100 may need one or more than one key word to be identified in this part of changed acoustical signal.
In various embodiment of the present invention, acoustical signal be can adopt in can audible scope (20Hz-20,000Hz), under or outside frequency.In some embodiment of most of electronic equipments of applying in the routine use relating at us, acoustical signal is can be audible.This part of the acoustical signal of changing must comprise the voice wake command of being sent by equipment user.Voice wake command can comprise that keyword recognition device 106 is interpreted as at least one key word of the request to wake-up master 108.Such key word can be the phrase as " my mobile phone " or " turning on TV ".
In certain embodiments, electronic equipment 100 is applied to some specific purposes, and acoustical signal is ultrasonic or infrasonic sound.An example is to trigger WOR the specific application of operation with ultrasonic signal, for example, warn for user's the specific health and safety in this locality; Other in wake-up device is wireless or optical communications protocols to receive or to send relevant localization data.Other can not audible example be possible with using.
Waken system 110 must maintain low in fact level of power consumption, because the total power budget of electronic equipment 100 may be limited in sleep pattern.But keyword recognition device 106 can relate to some complicated signal processing algorithm, to identify exactly target keywords.The power consumption of keyword recognition device 106 increases along with the complicacy of signal processing algorithm conventionally.As a result of, there is the keyword recognition device 106 of complicated signal processing algorithm sometimes incompatible with waken system 110.
In order to reduce energy consumption, keyword recognition can realize in two steps, for distinguishing fast preliminary step of target keywords and for identifying exactly another high-level steps of target keywords.Preliminary step relates to limited power consumption, and is suitable for integrated in waken system 110.
Another exemplary block Figure 100 of the electronic equipment based on waken system of the various embodiments of Fig. 2 in illustrating according to the present invention.Keyword recognition is divided into two steps, a preliminary step and a high-level steps, and these two steps realize respectively in keyword search logical block 106A and keyword search device 106B.Keyword search logical block 106A is integrated in waken system 110, and remain consistently movable, even if main frame 108 is in sleep pattern.But keyword search device 106B is removed from waken system 110 and disabledly during sleep pattern is consumed with saving power.In certain embodiments, complicated signal processing algorithm is because its relatively scalable power budget is incorporated in keyword search device.
Keyword search logical block 106A is identified at least one target keywords in the part of the acoustical signal of changing of buffer memory in impact damper 104 in advance.Keyword search logical block 106A adopts relatively simple signal processing algorithm, and therefore maintains obvious low-level energy consumption.In one embodiment, this part that keyword search logical block 106A searches for the acoustical signal of changing is to find the speech energy of certain type that can be associated with the voice wake command that comprises some key word to distribute.In certain embodiments, keyword search logical block 106A distributes to distinguish voice wake command and conventional dialogic voice or one section of background music with speech energy.In the time energy distribution being detected, keyword search logical block 106A realizes keyword search device 106B via finger control signal, and this part that sends the acoustical signal of changing is for further identification.
In the time being implemented, keyword search device 106B starts from sleep pattern, and is identified in exactly the key word in this part of changed acoustical signal.In certain embodiments, complicated acoustic processing method is used to identify specific key word according to content and phonetic feature in keyword search device 106B.Because the pitch of voice changes in the middle of different people, if identical key word said by the people except the physical device owner; might be not identified.Once target keywords is identified by keyword search device 106B, wake control up and just produced to activate the main frame 108 in sleep pattern dormancy at first.
In one embodiment, it can be bimodulus that speech energy distributes, because separately a pair of key word in certain time interval is employed.For example, key word can be " phone waking me up ".Acoustic transducer 102 and keyword search logical block 106A are movable to detect this to key word consistently.These two unit consume low-level power, for example several milliwatts, and the dormancy in sleep pattern of the remainder of electronic equipment 100.Be detected once bimodulus speech energy distributes, keyword search logical block 106A is just delivered to keyword search device 106B by the speech samples of the buffer memory that comprises key word " phone waking me up ".Keyword search device 106B carrys out speech samples and the target keywords pair of comparison buffer memory by up-to-date isolation word recognition technology.If target keywords to being identified in the speech samples of buffer memory, keyword search device 106B triggers the control that wakes up to main frame 108, and main frame 108 is waken up from sleep pattern subsequently.In certain embodiments, main frame 108 is waited for and after waking up, is accepted other order.If do not have another order to be received in predetermined time interval, main frame 108 turns back to sleep pattern.
In certain embodiments, main frame 108 sends it back a response receiving to wake up while controlling.This response is can be audible or visible, makes user can be dependent on waken system 110 to identify the position of the electronic equipment 100 of disappearance.In another embodiment, waken system 110 receives the order from user during being applied in activity pattern as passage.Particularly, when driver skipper automobile and can not dial mobile phone time, he or she can wake mobile phone up and dial certain telephone number.Acoustical signal that series of orders is said from driver is recovered with continuous morning call, alternatively by phone release and make a phone call.
According to the present invention, acoustic transducer 102 is the microphones that preferably need low power consumption.In one embodiment, the conventional loudspeaker of seeing in a lot of electronic equipments is divided row's task (be re-tasked) to be used as acoustic transducer 102 in sleep pattern again.Diaphragm in loudspeaker is setting in motion due to sound pressure level, and voice coil loudspeaker voice coil is moved in magnetic field.Therefore produce pro rata with the amplitude of received sound pressure level at the voltage at the terminal two ends of voice coil loudspeaker voice coil.By these means, again divide the loudspeaker of row's task to turn round as dynamic microphones, convert acoustical signal to corresponding electric signal.
In the time that conventional loudspeaker is used as acoustic transducer 102, forever connects power (always on power) and obviously reduce.Particularly, almost each mobile device has one or more built-in microphones.But, as conventionally obtainable and the conventional microphone using due to its relative high power consumption instead of preferably.These microphones need to be started by constant bias current conventionally, and this bias current is generally between 150 μ A and 2mA.The total power budget of supposing sleep pattern is several milliwatts only, and microphone and the biasing that is associated will consume a sizable part for this budget.
In addition, general microphone only maintains the single pattern for sound conversion; But in the time relating to two kinds of sound translative mode, waken system 110 can work better with lower power level.In first mode, acoustic transducer 102 is to provide the loudspeaker that is again divided row's task of the simplification electric signal enough for pre-first sign identification, distributes to distinguish voice wake command especially for the speech energy based on certain type.In the second pattern, the part of the acoustical signal of changing be hunted down and buffer memory for the keyword recognition at keyword search device 106B.Can then be captured in more accurately the voice subsequently in this second pattern by being enabled in the conventional microphone recording more accurately under higher a little power level.The details after a while of the acoustical signal of therefore, changing is recorded with high fidelity.Acoustic transducer 102 carries out work with the first mode that needs much lower power to operate than the second pattern in its most of running time.Conventional microphone only operates in the second pattern, optimizes first mode to reduce the power consumption during most of running time.
Therefore, acoustic transducer 102 preferably uses 1) again divide the loudspeaker and 2 of row's task) combination based on change the conventional microphone of acoustic pressure more than a kind of pattern realizes.Relating in infrasonic sound and ultrasonic some embodiment, acoustic transducer 102 is also designed to the acoustical signal in corresponding frequency range to respond.
In various embodiment of the present invention, impact damper 104 is incorporated in sonic transducer 102 or keyword recognition device 106A temporarily to store a part for the acoustical signal of being changed.One skilled in the art will appreciate that impact damper 104 is illustrated as alternatively independently parts in Fig. 1 and 2.
The illustrative methods that electronic equipment is waken up from sleep pattern 300 of the various embodiments of Fig. 3 in illustrating according to the present invention.In step 302, acoustical signal is hunted down and converts electric signal to.In step 304, at least one in multiple key words is detected in a part for changed acoustical signal.In step 30, wake control up and produced that the main frame of electronic equipment is activated from sleep pattern.
In order further to save the power consumption under sleep pattern, step 304 is divided into a preliminary step and a senior keyword recognition step.In step 3042, speech energy is distributed in and in this part of changed acoustical signal, is first identified with corresponding at least one in multiple key words.In step 3044, be buffered with this part of the acoustical signal of changing of speech energy distribution correlation connection.In step 3046, keyword search device is activated to detect at least one in the multiple key words in this part of changed acoustical signal.Step 3042 is constantly realized the speech energy detecting roughly corresponding to key word and is distributed, and step 3044 and 3046 just enforcements in the time that such speech energy distribution is successfully identified.Normally power consumption is large to suppose keyword recognition accurately in step 3046, and such layout of the identification step based on independent can reduce the required total power consumption of equipment arousal function effectively.
Those skilled in the art will know that electronic equipment 100 can be a lot of miscellaneous equipments that desktop PC, laptop computer, panel computer, mobile phone, televisor and merging sleep pattern also need to start from sleep pattern.In the time that mobile device is widely used in our daily life, the present invention is useful especially to starting easily mobile device, the energy content of battery that consumes limited quantity during sleep pattern simultaneously.
Although the present invention allows various amendments and optional form, its specific example is shown in the drawings and be described in detail in this article.However, it should be understood that and the invention is not restricted to particular forms disclosed, and contrary, the present invention contains to fall all modifications, equivalence and optional form within the scope of the appended claims.
Claims (20)
1. waken system electronic equipment being waken up from sleep pattern, comprising:
Acoustic transducer, it receives acoustical signal and converts described acoustical signal to electric signal, and wherein said acoustic transducer is divided row task again from conventional loudspeaker;
Keyword search logical block, it is coupled to described acoustic transducer, the speech energy distribution that the identification in advance in a part for described electric signal of described keyword search logical block is corresponding with at least one key word in multiple key words, and produce first and wake control up, described first wakes control up is further applied to the main frame in described electronic equipment is activated from described sleep pattern.
2. waken system according to claim 1, wherein said waken system is constantly powered with low in fact power level, and whether the described main frame of not considering described electronic equipment is in described sleep pattern.
3. waken system according to claim 1, wherein said waken system also comprises impact damper, in order to the described part of the described electric signal of interim storage.
4. waken system according to claim 1, wherein said first wakes control up first for the keyword search device of described main frame is activated from described sleep pattern, described keyword search device is further with described at least one key word in the described multiple key words of accuracy identification that improve, and produces second and wake up to control and activate complete host function.
5. waken system according to claim 4, wherein said keyword search logical block adopts simpler acoustic processing method and consumes power still less than described keyword search device.
6. waken system according to claim 4, wherein said acoustic transducer operates to reduce power consumption with two kinds of patterns, be hunted down to produce simply enough described electric signal for the pre-first sign identification in described keyword search logical block in acoustical signal described in first mode, the sound of being caught exactly for the raising in described keyword search device in the part of acoustical signal described in the second pattern is identified.
7. waken system according to claim 1, described at least one key word in wherein said multiple key words is different from conventional polite or as one of music section of ground unrest.
8. waken system according to claim 1, wherein said acoustical signal comprises voice wake command, described voice wake command also comprises described at least one key word in described multiple key word, and in the time receiving described voice wake command, described waken system wakes the described main frame of described electronic equipment up from described sleep pattern.
9. waken system according to claim 1, wherein said main frame wakes up while controlling and sends it back a response receiving described first, makes user can be dependent on described waken system to identify the position of described electronic equipment.
10. waken system according to claim 1, wherein said acoustical signal is associated with the pressure wave that adopts the frequency outside can audible frequency range.
11. 1 kinds are waken up the method for electronic equipment, comprise the following steps: from sleep pattern
Convert the acoustical signal being received by acoustic transducer to electric signal, wherein said acoustic transducer is divided row task again from conventional loudspeaker;
In a part for described electric signal, detect in advance the speech energy distribution corresponding with at least one key word in multiple key words;
Keyword search device is activated from described sleep pattern, to further identify described at least one key word in described multiple key words with the accuracy improving; And
Generation wakes control up, so that the main frame of described electronic equipment is activated from described sleep pattern.
12. methods of waking electronic equipment up according to claim 11, described at least one key word in wherein said multiple key words is different from conventional polite or as one of music section of ground unrest.
13. methods of waking electronic equipment up according to claim 11, described acoustic transducer operates to reduce power consumption with two kinds of patterns, be hunted down to produce simply described electric signal enough for sound detection in advance in acoustical signal described in first mode, the sound of being caught exactly for the raising in described keyword search device in the described part of acoustical signal described in the second pattern is identified.
14. methods of waking electronic equipment up according to claim 11, wherein said acoustical signal is associated with the pressure wave that adopts the frequency outside can audible frequency range.
15. methods of waking electronic equipment up according to claim 11, it is bimodulus that wherein said speech energy distributes, because described at least one key word in described multiple key word is associated with a pair of key word that separates a period of time interval.
16. 1 kinds of electronic equipments, comprising:
Waken system, is constantly powered under its substantially low power level, also comprises: (1) receives acoustical signal and described acoustical signal converted to the acoustic transducer of electric signal, and wherein said acoustic transducer is divided row task again from conventional loudspeaker; And (2) keyword search logical block, it is coupled to described acoustic transducer, described keyword search logical block detects in advance the speech energy distribution corresponding with at least one key word in multiple key words in a part for described electric signal, and initiates data transmission; And
Keyword search device, it is coupled to described waken system, and described keyword search device further wakes up and controls to activate the main frame of described electronic equipment with described at least one key word in the described multiple key words of accuracy identification that improve generation.
17. electronic equipments according to claim 16, wherein, in described sleep pattern, described electronic equipment adopts different activity levels to forbid different programs and the different hardware cell of stopping using.
18. electronic equipments according to claim 16, wherein said main frame wakes up while controlling and sends it back a response receiving described first, makes user can be dependent on described waken system to identify the position of described electronic equipment.
19. electronic equipments according to claim 16, wherein said waken system also comprises impact damper, to store the described part of described electric signal temporarily.
20. electronic equipments according to claim 16, wherein said acoustical signal is associated with the pressure wave that adopts the frequency outside can audible frequency range.
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| Application Number | Priority Date | Filing Date | Title |
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| US201361790760P | 2013-03-15 | 2013-03-15 | |
| US61/790,760 | 2013-03-15 | ||
| US13/925,705 US9703350B2 (en) | 2013-03-15 | 2013-06-24 | Always-on low-power keyword spotting |
| US13/925,705 | 2013-06-24 |
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| CN104049707A true CN104049707A (en) | 2014-09-17 |
| CN104049707B CN104049707B (en) | 2019-02-15 |
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