US20190174006A1 - Speakerphone system or speakerphone accessory with on-cable microphone - Google Patents
Speakerphone system or speakerphone accessory with on-cable microphone Download PDFInfo
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- US20190174006A1 US20190174006A1 US16/173,801 US201816173801A US2019174006A1 US 20190174006 A1 US20190174006 A1 US 20190174006A1 US 201816173801 A US201816173801 A US 201816173801A US 2019174006 A1 US2019174006 A1 US 2019174006A1
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- electrical signal
- speakerphone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
- H04M1/6041—Portable telephones adapted for handsfree use
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/62—Constructional arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
- H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
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- H04M1/72527—
Definitions
- This disclosure relates to telecommunication, and, more particularly, to a system and methods for reducing echo in a speakerphone call.
- a speakerphone system One purpose of a speakerphone system is to allow a user to conduct a phone call without having to hold a conventional handset.
- a speakerphone may allow the user's hands to be free, the user to move freely about the room while participating in the call, and multiple people to participate in the phone call from one location, such as a conference room.
- a conventional speakerphone system 100 may include a speakerphone 101 and a far-side phone 102 .
- the speakerphone 101 may include a speakerphone housing 103 , having a microphone 104 and a loudspeaker 105 within the speakerphone housing 103 or supported by the speakerphone housing 103 .
- the speakerphone 101 may also include an acoustic echo cancelation (AEC) filter 106 and a non-linear processing (NLP) module 107 .
- AEC acoustic echo cancelation
- NLP non-linear processing
- the party speaking and listening through the speakerphone is typically called the near side, while the party calling into the speakerphone is typically called the far side.
- the far-side party calls in through the far-side phone 102 .
- a signal received from the far-side phone 102 propagates through a receive path (Rx-path) and is called an Rx-path signal 108
- the signal received by the microphone 104 propagates through a transmit path (Tx-path) and is called a Tx-path signal 109 .
- the Rx-path and the Tx-path are each fully active, or open, at any given time during the phone call.
- half-duplex mode only one of the two paths is open at a time.
- the inactive side which is the side that is not speaking, cannot interrupt the active side, which is the side that is speaking, because the inactive side is muted. Accordingly, the half-duplex mode may lead to an unnatural experience for the parties, making it difficult to hold a conversation.
- This bypass signal 110 is also called the acoustic echo path, and the far-side party may experience the bypass signal 110 as an echo. In other words, the far-side party may hear his or her own voice signal coming back, usually after a short delay.
- AEC acoustic echo cancelation
- the NLP module 107 may provide additional suppression of any remaining acoustic echo, particularly of any component of the acoustic echo that is non-linear. This is generally done by destructively removing a portion of the outgoing, transmit-path signal 109 , although this may damage the signal.
- AEC algorithms generally work well, one challenge with implementing them is the close proximity of the microphone 104 to the loudspeaker 105 in a conventional speakerphone system 100 . That is, as the microphone 104 is positioned closer to the loudspeaker 105 , the incoming signal picked up by the microphone 104 becomes louder, or stronger.
- the desired signal from the party talking at the near side typically originates much farther from the microphone 104 than the loudspeaker 105 is from the microphone 104 .
- the desired signal presents a significantly quieter, or weaker, signal to the microphone 104 relative to the Rx-path signal 108 rendered by the loudspeaker 105 .
- the ratio between the desired signal from the party talking at the near side and the acoustic echo path 110 can be quantified as a signal-to-echo ratio.
- a signal-to-echo ratio of down to about ⁇ 20 or ⁇ 25 dB can be managed by a conventional AEC algorithm. This means that the AEC algorithm is effective at canceling the acoustic echo up to about that ratio. For ratios smaller than about ⁇ 20 or ⁇ 25 dB, echo cancelation may be much less effective, meaning that the far-side party may perceive an echo, or a partial echo, of that party's own voice because all or some of the acoustic echo may bleed through the AEC filter 106 .
- a high-quality system is one that provides full duplex support and no echo at the far side. At a signal-to-echo ratio of less than about ⁇ 25 dB, however, that goal generally cannot be achieved.
- the signal-to-echo ratio can be a significant problem in small speakerphones, where the smaller size means that the loudspeaker 105 must be closer to the microphone 104 .
- a portion of the acoustic echo path signal 110 may be conducted structurally, through the coupling between the loudspeaker 105 and the microphone 104 .
- a plastic housing component may rattle at the loudspeaker's frequency, and the rattling may be transmitted through structural conduction to the microphone 104 where it is sensed.
- this structurally conducted sound has a transfer function that is typically non-linear.
- Conventional speakerphones may address such unwanted structural sound by including suspension mechanisms, such as rubber sleeves or springs, to isolate the mechanical vibration. Those solutions, however, increase the cost and complexity of the speakerphone system. Also, those solutions might not effectively reduce the structural sound at some frequencies.
- Embodiments of the invention address these and other issues in the prior art.
- Embodiments of the disclosed subject matter provide a speakerphone with a relatively small form factor but an improved signal-to-echo ratio over existing small speakerphones. Accordingly, embodiments include a loudspeaker in a housing and a microphone that is remote from the housing, on a cable or on a connector at a distal end of the cable. Thus, relative to conventional designs with the microphone and loudspeaker in the same housing, the microphone and the loudspeaker are farther apart and mechanically isolated from each other, both without increasing the form factor of the housing.
- a portable speakerphone may include a housing, a receiving transducer, an electrical cable, a transmitting transducer, and a processor.
- the receiving transducer is affixed to the housing and is configured to receive a first electrical signal from a mobile device.
- the electrical cable is coupled to and extends from the housing.
- the transmitting transducer is affixed to the electrical cable, remote from the housing.
- the transmitting transducer is configured to transmit a second electrical signal, and the second electrical signal is based in part on the first electrical signal.
- the processor is configured to suppress acoustic echo by modifying the second electrical signal.
- the processor is also configured to output the modified second electrical signal to the mobile device.
- the receiving transducer is a loudspeaker.
- the transmitting transducer is a microphone.
- the electrical cable has a connector at a distal end of the electrical cable, opposite a proximal end of the electrical cable coupled to the housing, and the transmitting transducer is a microphone located along the electrical cable, between the proximal end of the electrical cable and the connector.
- the transmitting transducer is a microphone affixed to the connector or substantially enclosed within the connector.
- At least some embodiments of a method of calibrating a distance between a loudspeaker and a microphone in a speakerphone may include receiving, at a loudspeaker affixed to a housing, a receive-path signal from a far-side device; transmitting, by a microphone remote from the housing and affixed to a distal end of an electrical cable that is coupled to and extends from the housing at a proximal end of the electrical cable, a transmit-path signal, the transmit-path signal being based in part on the receive-path signal; determining, by a processor, a signal-to-echo ratio of the second electrical signal; increasing a length of the electrical cable until the determined signal-to-echo ratio is greater than a minimum desired ratio, the minimum desired ratio being about ⁇ 25 dB; modifying, by the processor, the transmit-path signal; and outputting the modified transmit-path signal to the far-side device.
- FIG. 1 is a functional block diagram showing signal paths in a conventional speakerphone system.
- FIG. 2 is a front, perspective view of a speakerphone with an on-cable microphone, according to embodiments of the invention.
- FIG. 3 is a functional block diagram showing signal paths in a system incorporating a speakerphone with an on-cable microphone, according to embodiments of the invention.
- FIG. 4 is a functional block diagram showing signal paths in a system incorporating a speakerphone with an on-cable microphone, according to embodiments of the invention.
- embodiments of the invention are directed to an apparatus providing a speakerphone with a relatively small form factor but an improved signal-to-echo ratio over existing small speakerphones.
- embodiments of the invention include a loudspeaker in a housing and a microphone that is remote from the housing, on a cable or on a connector at a distal end of the cable.
- the microphone and the loudspeaker may be separated at a distance without increasing the form factor of the housing.
- the microphone and the loudspeaker are substantially isolated from each other because the microphone is remote from the housing. This helps to reduce or eliminate the structural transmission of sound waves, without the need for additional structures, such as suspension mechanisms, to isolate the mechanical vibration from the sound waves.
- a “small form factor” with respect to a speakerphone housing means that, if a microphone and a loudspeaker were both integrated in the housing, the distance between the microphone and the loudspeaker would be less than about 100 mm (about 4 inches).
- the housing and the electrical cable may be configured to separate the microphone and the loudspeaker by more than about four inches, with the microphone being outside of the housing.
- “small form factor” means that the length, the width, and the height of the housing each do not exceed about four inches.
- small form factor means that the distance between the microphone and the loudspeaker is greater than maximum external dimension of the housing. Accordingly, the microphone is farther away from the loudspeaker than it would be if the microphone were within the speakerphone housing, and the microphone is structurally isolated from the housing, and likewise the loudspeaker, by the cable. The distances are measured with the cable fully extended away from the speakerphone housing.
- FIG. 2 is a front, perspective view showing material portions of a speakerphone 201 with an on-cable microphone according to embodiments of the invention.
- a speakerphone 201 with an on-cable microphone may include a loudspeaker housing 203 , a cable 211 , a connector 212 , a receiving transducer 205 , and a transmitting transducer 204 .
- the receiving transducer 205 is configured to receive an electrical signal.
- the receiving transducer 205 may be a loudspeaker that is configured to receive and render an audio signal.
- the transmitting transducer 204 is configured to transmit an electrical signal.
- the transmitting transducer 204 may be a microphone, and the transmitting transducer 204 may be configured to transmit a microphone signal.
- the transmitting transducer 204 may include, as examples, an electret condenser microphone (ECM), a microelectromechanical system (MEMS) microphone, or a dynamic microphone capsule.
- ECM electret condenser microphone
- MEMS microelectromechanical system
- the transmitting transducer 204 may be an accelerometer, such as an accelerometer to detect sound vibrations. Other types of transmitting transducers may also be used.
- the connector 212 may be any connector configured to connect to an electronic device, such as a mobile device.
- the mobile device may be a cellular telephone, a smartphone, or a tablet computer.
- the connector 212 may be, for example, a universal serial bus (USB) connector.
- USB universal serial bus
- the transmitting transducer 204 may be integrated into the connector 212 by being substantially enclosed within the connector 212 .
- the connector 212 may include an aperture 213 to permit sound waves, for example, to be sensed by the transmitting transducer 204 .
- the transmitting transducer 204 may be attached, or affixed, to the connector 212 .
- the speakerphone 201 may signal the electronic device to deactivate the electronic device's microphone or loudspeaker or both.
- the loudspeaker housing 203 may substantially enclose or otherwise support the receiving transducer 205 .
- the loudspeaker housing 203 may have one or more substantially flat outer surfaces configured to rest on a horizontal support surface, such as a desk or table.
- the loudspeaker housing 203 may be made from plastic, metal, or another rigid or semi-rigid material.
- the cable 211 extends from the loudspeaker housing 203 and physically connects the connector 212 to the loudspeaker housing 203 .
- the cable 211 may be any cable, such as a flexible, electrical cable, configured to carry an electrical signal between the connector 212 and the loudspeaker housing 203 .
- the transmitting transducer 204 may be located along the cable 211 rather than at the connector 212 .
- the transmitting transducer 204 may be substantially enclosed within a transducer housing.
- the transducer housing may be configured to protect the transmitting transducer 204 , and it may be configured to channel a signal, such as a sound wave, to the transmitting transducer 204 .
- the cable 211 may be permanently attached to the loudspeaker housing 203 , or the cable 211 may be detachably connected to the loudspeaker housing 203 , such as with a second electrical connector.
- the cable 211 may be of any suitable length, although the cable 211 preferably has a length between about 3 inches (about 80 mm) and about 3 feet (about 0.9 m). More preferably, the cable 211 has a length between about 5 inches (about 130 mm) and about 2 feet (about 0.6 m).
- a “suitable length” is a length that results in there being a distance between the receiving transducer 205 and the transmitting transducer 204 such that the signal-to-echo ratio is no less than about ⁇ 25 dB (decibels) or, more preferably, no less than about ⁇ 20 dB.
- one or more transmitting transducers 204 may be located at the connector 212 , and one or more transmitting transducers 204 may be located on the cable 211 , or both, to form an array of transmitting transducers 204 .
- the array of transmitting transducers 204 may form, for example, a beamforming array.
- the transmitting transducer 204 is a microphone
- the array of microphones may be configured as a directional microphone.
- FIG. 3 is a functional block diagram showing material portions of signal paths in a system 300 incorporating a speakerphone with an on-cable microphone.
- a system 300 incorporating a speakerphone with an on-cable microphone may include a speakerphone 301 and the ability to connect to a far-side device 302 .
- the speakerphone 301 may include a transmitting transducer 304 , a receiving transducer 305 , an acoustic echo cancelation (AEC) processor 306 , a non-linear processing (NLP) module 307 , and a mixer 314 .
- the speakerphone 301 may also include other signal processing configured to enhance signal quality.
- a call is initiated by either the far-side device 302 or the speakerphone 301 .
- the transmitting transducer 304 transmits a transmit-path signal 309 that is received by the AEC processor 306 and the mixer 314 .
- the receiving transducer 305 and the AEC processor 306 receive a receive-path signal 308 from the far-side device 302 .
- the AEC processor 306 outputs an AEC signal 315 to the mixer 314
- the mixer 314 combines the AEC signal 315 and the transmit-path signal 309 to output a reduced echo-path signal 316 to the NLP module 307 .
- the NLP module 307 receives the reduced echo-path signal 316 and outputs a processed signal 317 that is transmitted to the far-side device 302 .
- the transmitting transducer 304 and the receiving transducer 305 may be generally as described above for FIG. 2 .
- the transmitting transducer 304 may be a microphone
- the receiving transducer 305 may be a loudspeaker.
- the transmitting transducer 304 is separated from the receiving transducer 305 by a cable 311 to structurally isolate the transmitting transducer 304 from the receiving transducer 305 and to cause the transmitting transducer 304 and the receiving transducer 305 to be separated at a distance.
- the signal-to-echo ratio improves over what the ratio would be at a closer distance.
- the cable 311 may have a variety of suitable lengths, such as those described above for the cable 211 , the cable 311 is shown in FIG. 3 with break lines.
- the AEC processor 306 and the NLP module 307 operate generally as discussed above for FIG. 1 , and the AEC processor 306 may include an AEC filter or an AEC adaptive filter. That is, the AEC processor 306 may include a signal-processing algorithm that compares the incoming, receive-path signal 308 with the outgoing, transmit-path signal 309 and then subtracts the incoming signal from the outgoing signal. The subtracting of the receive-path signal 308 from the transmit-path signal 309 may be in combination with the mixer 314 .
- the telephone functionality for the near side may be integrated into the speakerphone 301 , or the telephone functionality may be provided by an external device, such as a traditional, wired telephone; a cellular telephone; or a Voice over Internet Protocol (VoIP) telephone or device, including a computer or mobile device operating over the Internet, for example. If the telephone functionality is provided by an external device, the external device may mediate between the speakerphone 301 and the far-side device 302 . An example of this is shown in FIG. 4 .
- VoIP Voice over Internet Protocol
- the far-side device 302 may be a communication device, such as a traditional, wired telephone; a cellular telephone; or a Voice over Internet Protocol (VoIP) telephone or device, including a computer or mobile device operating over the Internet, for example.
- VoIP Voice over Internet Protocol
- One or more of the AEC processor 306 , the NLP module 307 , and the mixer 314 may be located in a loudspeaker housing 303 , such as the loudspeaker housing 203 of FIG. 2 .
- a loudspeaker housing 303 such as the loudspeaker housing 203 of FIG. 2 .
- one or more of those components may be located in a connector, such as the connector 212 of FIG. 2 .
- FIG. 4 is a functional block diagram showing material portions of signal paths in a system 400 incorporating a speakerphone with an on-cable microphone.
- a system 400 incorporating a speakerphone with an on-cable microphone may include a speakerphone accessory 401 , a near-side device 418 , and the ability to connect to a far-side device 402 .
- the ability to connect to a far-side device 402 may be wireless, as illustrated in FIG. 4 , or the ability to connect may be wired or a combination of wired and wireless connections.
- the speakerphone accessory 401 may be the speakerphone 201 of FIG. 2 .
- the term “accessory” is used because the speakerphone accessory 401 connects to the near-side device 418 , which may provide the telephone functionality for the near side.
- the speakerphone accessory 401 may include a transmitting transducer 404 , a receiving transducer 405 , an acoustic echo cancelation (AEC) processor 406 , a non-linear processing (NLP) module 407 , and a mixer 414 .
- the speakerphone accessory 401 may also include other signal processing configured to enhance signal quality.
- the near-side device 418 may be a communication device, such as a traditional, wired telephone; a cellular telephone; or a Voice over Internet Protocol (VoIP) telephone or device, including a computer or mobile device operating over the Internet, for example.
- VoIP Voice over Internet Protocol
- a call is initiated by either the far-side device 402 or the near-side device 418 .
- the transmitting transducer 404 transmits a transmit-path signal 409 that is received by the AEC processor 406 and the mixer 414 .
- the receiving transducer 405 and the AEC processor 406 receive a receive-path signal 408 from the far-side device 402 , through near-side device 418 .
- the AEC processor 406 outputs an AEC signal 415 to the mixer 414
- the mixer 414 combines the AEC signal 415 and the transmit-path signal 409 to output a reduced echo-path signal 416 to the NLP module 407 .
- the NLP module 407 receives the reduced echo-path signal 416 and outputs a processed signal 417 that is transmitted to the far-side device 402 .
- the transmitting transducer 404 and the receiving transducer 405 may be generally as described above for FIG. 2 .
- the transmitting transducer 404 may be a microphone
- the receiving transducer 405 may be a loudspeaker.
- the transmitting transducer 404 may be integrated into a connector 412 , such as shown diagrammatically in FIG. 4 , or the transmitting transducer 404 may be located along a cable 411 . A representative segment of the cable 411 is shown diagrammatically in FIG. 4 .
- the transmitting transducer 404 is separated from the receiving transducer 405 by the cable 411 to structurally isolate the transmitting transducer 404 from the receiving transducer 405 and to cause the transmitting transducer 404 and the receiving transducer 405 to be separated at a distance. As discussed above, because of this distance, the signal-to-echo ratio improves over what the ratio would be at a closer distance.
- the cable 411 may have a variety of suitable lengths, such as those described above for the cable 211 .
- the AEC processor 406 and the NLP module 407 operate generally as discussed above for FIG. 1 , and the AEC processor 406 may include an AEC filter or an AEC adaptive filter. That is, the AEC processor 406 may include a signal-processing algorithm that compares the incoming, receive-path signal 408 with the outgoing, transmit-path signal 409 and then subtracts the incoming signal from the outgoing signal. The subtracting of the receive-path signal 408 from the transmit-path signal 409 may be in combination with the mixer 414 .
- embodiments of the invention may be implemented as an accessory to an existing speakerphone system in a near-side device 418 , such as a speakerphone system built in to a mobile device.
- the speakerphone accessory 401 may supplement or replace the existing system.
- the speakerphone accessory 401 may signal the near-side device 418 to deactivate the microphone or loudspeaker or both of the near-side device 418 .
- embodiments of the invention provide a speakerphone with a relatively small form factor but an improved signal-to-echo ratio over conventional small speakerphones by, for example, locating the transmitting transducer remotely from the speakerphone housing containing the receiving transducer.
- the transmitting transducer may be located on a connector or a connector cable extending from the housing.
- the microphone and the loudspeaker may be separated at a distance without increasing the form factor of the housing. This separation also helps to reduce or eliminate the structural transmission of sound waves that may propagate through the housing.
- embodiments of the invention may improve the performance of a conventional AEC filter and a conventional NLP module used within the disclosed system.
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Abstract
A portable speakerphone having a housing, a receiving transducer, an electrical cable, a transmitting transducer, and a processor. The receiving transducer is affixed to the housing and is configured to receive a first electrical signal from a mobile device. The electrical cable is coupled to and extends from the housing. The transmitting transducer is affixed to the electrical cable, remote from the housing. Also, the transmitting transducer is configured to transmit a second electrical signal, and the second electrical signal is based in part on the first electrical signal. The processor is configured to suppress acoustic echo by modifying the second electrical signal. The processor is also configured to output the modified second electrical signal to the mobile device. A related method is also disclosed.
Description
- This patent application claims priority to and the benefit of U.S. Provisional Application No. 62/257,120, filed Nov. 18, 2015, which is incorporated in this patent application by this reference.
- This disclosure relates to telecommunication, and, more particularly, to a system and methods for reducing echo in a speakerphone call.
- One purpose of a speakerphone system is to allow a user to conduct a phone call without having to hold a conventional handset. Thus, a speakerphone may allow the user's hands to be free, the user to move freely about the room while participating in the call, and multiple people to participate in the phone call from one location, such as a conference room.
- A
conventional speakerphone system 100, such as shown inFIG. 1 , may include aspeakerphone 101 and a far-side phone 102. Thespeakerphone 101 may include aspeakerphone housing 103, having amicrophone 104 and aloudspeaker 105 within thespeakerphone housing 103 or supported by thespeakerphone housing 103. Thespeakerphone 101 may also include an acoustic echo cancelation (AEC)filter 106 and a non-linear processing (NLP)module 107. - In the context of speakerphone systems, the party speaking and listening through the speakerphone is typically called the near side, while the party calling into the speakerphone is typically called the far side. Hence the far-side party calls in through the far-
side phone 102. Additionally, a signal received from the far-side phone 102 propagates through a receive path (Rx-path) and is called an Rx-path signal 108, while the signal received by themicrophone 104 propagates through a transmit path (Tx-path) and is called a Tx-path signal 109. - Also, there are two common modes for a conventional speakerphone. In full-duplex mode, the Rx-path and the Tx-path are each fully active, or open, at any given time during the phone call. In half-duplex mode, however, only one of the two paths is open at a time. Thus, for example, if the far-side party is talking, the Rx-path is active and the Tx-path is muted. This helps to avoid echo at the far side. Yet, it also means that the inactive side, which is the side that is not speaking, cannot interrupt the active side, which is the side that is speaking, because the inactive side is muted. Accordingly, the half-duplex mode may lead to an unnatural experience for the parties, making it difficult to hold a conversation.
- One fundamental problem of conventional speakerphones is a loudspeaker-to-
microphone bypass signal 110 on the near side. Thisbypass signal 110 is also called the acoustic echo path, and the far-side party may experience thebypass signal 110 as an echo. In other words, the far-side party may hear his or her own voice signal coming back, usually after a short delay. - To overcome this problem, many conventional speakerphones implement an acoustic echo cancelation (AEC) signal-processing algorithm, for example, through the
AEC filter 106. In general, the AEC algorithm compares the incoming, receive-path signal 108 with the outgoing, transmit-path signal 109 and then subtracts theincoming signal 108 from theoutgoing signal 109. As a result, the processed transmit-path signal contains content from the near side, but not content received from the far side. Accordingly, the acoustic-echo-path signal 110 may be reduced or eliminated. - The
NLP module 107 may provide additional suppression of any remaining acoustic echo, particularly of any component of the acoustic echo that is non-linear. This is generally done by destructively removing a portion of the outgoing, transmit-path signal 109, although this may damage the signal. - While AEC algorithms generally work well, one challenge with implementing them is the close proximity of the
microphone 104 to theloudspeaker 105 in aconventional speakerphone system 100. That is, as themicrophone 104 is positioned closer to theloudspeaker 105, the incoming signal picked up by themicrophone 104 becomes louder, or stronger. The desired signal from the party talking at the near side, however, typically originates much farther from themicrophone 104 than theloudspeaker 105 is from themicrophone 104. Hence, the desired signal presents a significantly quieter, or weaker, signal to themicrophone 104 relative to the Rx-path signal 108 rendered by theloudspeaker 105. - The ratio between the desired signal from the party talking at the near side and the
acoustic echo path 110 can be quantified as a signal-to-echo ratio. As a conventional rule of thumb, a signal-to-echo ratio of down to about −20 or −25 dB can be managed by a conventional AEC algorithm. This means that the AEC algorithm is effective at canceling the acoustic echo up to about that ratio. For ratios smaller than about −20 or −25 dB, echo cancelation may be much less effective, meaning that the far-side party may perceive an echo, or a partial echo, of that party's own voice because all or some of the acoustic echo may bleed through theAEC filter 106. A high-quality system is one that provides full duplex support and no echo at the far side. At a signal-to-echo ratio of less than about −25 dB, however, that goal generally cannot be achieved. - Additionally, the signal-to-echo ratio can be a significant problem in small speakerphones, where the smaller size means that the
loudspeaker 105 must be closer to themicrophone 104. Mathematically, halving the distance between theloudspeaker 105 and themicrophone 104 results in a 6 dB decrease in the signal-to-echo ratio. For example, if the signal-to-echo ratio is −15 dB at a distance of 30 mm, halving the distance between theloudspeaker 105 and themicrophone 104 to 15 mm results in a signal-to-echo ratio of −21 dB. Likewise, doubling the distance between theloudspeaker 105 and themicrophone 104 results in a 6 dB increase in the signal-to-echo ratio. Thus, high-quality speakerphone systems tend to be relatively large to provide a favorable distance between themicrophone 104 and theloudspeaker 105. - Furthermore, while the main portion of the acoustic
echo path signal 110 travels through the air, a portion of the acousticecho path signal 110 may be conducted structurally, through the coupling between theloudspeaker 105 and themicrophone 104. For example, a plastic housing component may rattle at the loudspeaker's frequency, and the rattling may be transmitted through structural conduction to themicrophone 104 where it is sensed. Additionally, this structurally conducted sound has a transfer function that is typically non-linear. Conventional speakerphones may address such unwanted structural sound by including suspension mechanisms, such as rubber sleeves or springs, to isolate the mechanical vibration. Those solutions, however, increase the cost and complexity of the speakerphone system. Also, those solutions might not effectively reduce the structural sound at some frequencies. - Embodiments of the invention address these and other issues in the prior art.
- Embodiments of the disclosed subject matter provide a speakerphone with a relatively small form factor but an improved signal-to-echo ratio over existing small speakerphones. Accordingly, embodiments include a loudspeaker in a housing and a microphone that is remote from the housing, on a cable or on a connector at a distal end of the cable. Thus, relative to conventional designs with the microphone and loudspeaker in the same housing, the microphone and the loudspeaker are farther apart and mechanically isolated from each other, both without increasing the form factor of the housing.
- Accordingly, at least some embodiments of a portable speakerphone may include a housing, a receiving transducer, an electrical cable, a transmitting transducer, and a processor. The receiving transducer is affixed to the housing and is configured to receive a first electrical signal from a mobile device. The electrical cable is coupled to and extends from the housing. The transmitting transducer is affixed to the electrical cable, remote from the housing. Also, the transmitting transducer is configured to transmit a second electrical signal, and the second electrical signal is based in part on the first electrical signal. The processor is configured to suppress acoustic echo by modifying the second electrical signal. The processor is also configured to output the modified second electrical signal to the mobile device.
- In another aspect, in at least some embodiments of the speakerphone, the receiving transducer is a loudspeaker.
- In yet another aspect, in at least some embodiments of the speakerphone, the transmitting transducer is a microphone.
- In still another aspect, in at least some embodiments of the speakerphone, the electrical cable has a connector at a distal end of the electrical cable, opposite a proximal end of the electrical cable coupled to the housing, and the transmitting transducer is a microphone located along the electrical cable, between the proximal end of the electrical cable and the connector. In other embodiments, the transmitting transducer is a microphone affixed to the connector or substantially enclosed within the connector.
- In another aspect, at least some embodiments of a method of calibrating a distance between a loudspeaker and a microphone in a speakerphone may include receiving, at a loudspeaker affixed to a housing, a receive-path signal from a far-side device; transmitting, by a microphone remote from the housing and affixed to a distal end of an electrical cable that is coupled to and extends from the housing at a proximal end of the electrical cable, a transmit-path signal, the transmit-path signal being based in part on the receive-path signal; determining, by a processor, a signal-to-echo ratio of the second electrical signal; increasing a length of the electrical cable until the determined signal-to-echo ratio is greater than a minimum desired ratio, the minimum desired ratio being about −25 dB; modifying, by the processor, the transmit-path signal; and outputting the modified transmit-path signal to the far-side device.
-
FIG. 1 is a functional block diagram showing signal paths in a conventional speakerphone system. -
FIG. 2 is a front, perspective view of a speakerphone with an on-cable microphone, according to embodiments of the invention. -
FIG. 3 is a functional block diagram showing signal paths in a system incorporating a speakerphone with an on-cable microphone, according to embodiments of the invention. -
FIG. 4 is a functional block diagram showing signal paths in a system incorporating a speakerphone with an on-cable microphone, according to embodiments of the invention. - As described herein, embodiments of the invention are directed to an apparatus providing a speakerphone with a relatively small form factor but an improved signal-to-echo ratio over existing small speakerphones. Accordingly, embodiments of the invention include a loudspeaker in a housing and a microphone that is remote from the housing, on a cable or on a connector at a distal end of the cable. In this way, the microphone and the loudspeaker may be separated at a distance without increasing the form factor of the housing. Also, in a mechanical sense, the microphone and the loudspeaker are substantially isolated from each other because the microphone is remote from the housing. This helps to reduce or eliminate the structural transmission of sound waves, without the need for additional structures, such as suspension mechanisms, to isolate the mechanical vibration from the sound waves.
- As used in this disclosure, a “small form factor” with respect to a speakerphone housing means that, if a microphone and a loudspeaker were both integrated in the housing, the distance between the microphone and the loudspeaker would be less than about 100 mm (about 4 inches). To put it another way, the housing and the electrical cable may be configured to separate the microphone and the loudspeaker by more than about four inches, with the microphone being outside of the housing. Thus, for example, if the housing is essentially box-shaped, such as the
loudspeaker housing 203 ofFIG. 2 , then “small form factor” means that the length, the width, and the height of the housing each do not exceed about four inches. To generalize this further, including for housings that are not box-shaped, “small form factor” means that the distance between the microphone and the loudspeaker is greater than maximum external dimension of the housing. Accordingly, the microphone is farther away from the loudspeaker than it would be if the microphone were within the speakerphone housing, and the microphone is structurally isolated from the housing, and likewise the loudspeaker, by the cable. The distances are measured with the cable fully extended away from the speakerphone housing. -
FIG. 2 is a front, perspective view showing material portions of a speakerphone 201 with an on-cable microphone according to embodiments of the invention. As illustrated inFIG. 2 , a speakerphone 201 with an on-cable microphone may include aloudspeaker housing 203, acable 211, aconnector 212, a receivingtransducer 205, and a transmittingtransducer 204. - The receiving
transducer 205 is configured to receive an electrical signal. For example, the receivingtransducer 205 may be a loudspeaker that is configured to receive and render an audio signal. - The transmitting
transducer 204 is configured to transmit an electrical signal. For example, the transmittingtransducer 204 may be a microphone, and the transmittingtransducer 204 may be configured to transmit a microphone signal. The transmittingtransducer 204 may include, as examples, an electret condenser microphone (ECM), a microelectromechanical system (MEMS) microphone, or a dynamic microphone capsule. As another example, the transmittingtransducer 204 may be an accelerometer, such as an accelerometer to detect sound vibrations. Other types of transmitting transducers may also be used. - The
connector 212 may be any connector configured to connect to an electronic device, such as a mobile device. As examples, the mobile device may be a cellular telephone, a smartphone, or a tablet computer. Theconnector 212 may be, for example, a universal serial bus (USB) connector. In embodiments, such as shown inFIG. 2 , the transmittingtransducer 204 may be integrated into theconnector 212 by being substantially enclosed within theconnector 212. In such embodiments, theconnector 212 may include anaperture 213 to permit sound waves, for example, to be sensed by the transmittingtransducer 204. Alternatively, the transmittingtransducer 204 may be attached, or affixed, to theconnector 212. When theconnector 212 is connected to the electronic device, the speakerphone 201 may signal the electronic device to deactivate the electronic device's microphone or loudspeaker or both. - The
loudspeaker housing 203 may substantially enclose or otherwise support the receivingtransducer 205. Theloudspeaker housing 203 may have one or more substantially flat outer surfaces configured to rest on a horizontal support surface, such as a desk or table. Theloudspeaker housing 203 may be made from plastic, metal, or another rigid or semi-rigid material. - The
cable 211 extends from theloudspeaker housing 203 and physically connects theconnector 212 to theloudspeaker housing 203. Thecable 211 may be any cable, such as a flexible, electrical cable, configured to carry an electrical signal between theconnector 212 and theloudspeaker housing 203. In some embodiments, the transmittingtransducer 204 may be located along thecable 211 rather than at theconnector 212. In such embodiments, the transmittingtransducer 204 may be substantially enclosed within a transducer housing. The transducer housing may be configured to protect the transmittingtransducer 204, and it may be configured to channel a signal, such as a sound wave, to the transmittingtransducer 204. Thecable 211 may be permanently attached to theloudspeaker housing 203, or thecable 211 may be detachably connected to theloudspeaker housing 203, such as with a second electrical connector. - The
cable 211 may be of any suitable length, although thecable 211 preferably has a length between about 3 inches (about 80 mm) and about 3 feet (about 0.9 m). More preferably, thecable 211 has a length between about 5 inches (about 130 mm) and about 2 feet (about 0.6 m). In this context, a “suitable length” is a length that results in there being a distance between the receivingtransducer 205 and the transmittingtransducer 204 such that the signal-to-echo ratio is no less than about −25 dB (decibels) or, more preferably, no less than about −20 dB. - In some embodiments, there may be more than one transmitting
transducer 204. For example, one ormore transmitting transducers 204 may be located at theconnector 212, and one ormore transmitting transducers 204 may be located on thecable 211, or both, to form an array of transmittingtransducers 204. The array of transmittingtransducers 204 may form, for example, a beamforming array. As another example, in embodiments where the transmittingtransducer 204 is a microphone, the array of microphones may be configured as a directional microphone. -
FIG. 3 is a functional block diagram showing material portions of signal paths in asystem 300 incorporating a speakerphone with an on-cable microphone. As illustrated inFIG. 3 , asystem 300 incorporating a speakerphone with an on-cable microphone may include aspeakerphone 301 and the ability to connect to a far-side device 302. Thespeakerphone 301 may include a transmitting transducer 304, a receivingtransducer 305, an acoustic echo cancelation (AEC)processor 306, a non-linear processing (NLP)module 307, and amixer 314. Thespeakerphone 301 may also include other signal processing configured to enhance signal quality. - In operation, a call is initiated by either the far-
side device 302 or thespeakerphone 301. When a call is active, the transmitting transducer 304 transmits a transmit-path signal 309 that is received by theAEC processor 306 and themixer 314. Also, the receivingtransducer 305 and theAEC processor 306 receive a receive-path signal 308 from the far-side device 302. TheAEC processor 306 outputs anAEC signal 315 to themixer 314, and themixer 314 combines theAEC signal 315 and the transmit-path signal 309 to output a reduced echo-path signal 316 to theNLP module 307. TheNLP module 307 receives the reduced echo-path signal 316 and outputs a processedsignal 317 that is transmitted to the far-side device 302. - The transmitting transducer 304 and the receiving
transducer 305 may be generally as described above forFIG. 2 . Thus, the transmitting transducer 304 may be a microphone, and the receivingtransducer 305 may be a loudspeaker. The transmitting transducer 304 is separated from the receivingtransducer 305 by acable 311 to structurally isolate the transmitting transducer 304 from the receivingtransducer 305 and to cause the transmitting transducer 304 and the receivingtransducer 305 to be separated at a distance. As discussed above, because of this distance, the signal-to-echo ratio improves over what the ratio would be at a closer distance. Since thecable 311 may have a variety of suitable lengths, such as those described above for thecable 211, thecable 311 is shown inFIG. 3 with break lines. - The
AEC processor 306 and theNLP module 307 operate generally as discussed above forFIG. 1 , and theAEC processor 306 may include an AEC filter or an AEC adaptive filter. That is, theAEC processor 306 may include a signal-processing algorithm that compares the incoming, receive-path signal 308 with the outgoing, transmit-path signal 309 and then subtracts the incoming signal from the outgoing signal. The subtracting of the receive-path signal 308 from the transmit-path signal 309 may be in combination with themixer 314. - The telephone functionality for the near side may be integrated into the
speakerphone 301, or the telephone functionality may be provided by an external device, such as a traditional, wired telephone; a cellular telephone; or a Voice over Internet Protocol (VoIP) telephone or device, including a computer or mobile device operating over the Internet, for example. If the telephone functionality is provided by an external device, the external device may mediate between thespeakerphone 301 and the far-side device 302. An example of this is shown inFIG. 4 . - Returning to
FIG. 3 , the far-side device 302 may be a communication device, such as a traditional, wired telephone; a cellular telephone; or a Voice over Internet Protocol (VoIP) telephone or device, including a computer or mobile device operating over the Internet, for example. - One or more of the
AEC processor 306, theNLP module 307, and themixer 314 may be located in aloudspeaker housing 303, such as theloudspeaker housing 203 ofFIG. 2 . Alternatively, one or more of those components may be located in a connector, such as theconnector 212 ofFIG. 2 . -
FIG. 4 is a functional block diagram showing material portions of signal paths in asystem 400 incorporating a speakerphone with an on-cable microphone. As illustrated inFIG. 4 , asystem 400 incorporating a speakerphone with an on-cable microphone may include aspeakerphone accessory 401, a near-side device 418, and the ability to connect to a far-side device 402. The ability to connect to a far-side device 402 may be wireless, as illustrated inFIG. 4 , or the ability to connect may be wired or a combination of wired and wireless connections. Thespeakerphone accessory 401 may be the speakerphone 201 ofFIG. 2 . In thesystem 400 ofFIG. 4 , though, the term “accessory” is used because thespeakerphone accessory 401 connects to the near-side device 418, which may provide the telephone functionality for the near side. - Thus, the
speakerphone accessory 401 may include a transmittingtransducer 404, a receivingtransducer 405, an acoustic echo cancelation (AEC)processor 406, a non-linear processing (NLP)module 407, and amixer 414. Thespeakerphone accessory 401 may also include other signal processing configured to enhance signal quality. - The near-
side device 418 may be a communication device, such as a traditional, wired telephone; a cellular telephone; or a Voice over Internet Protocol (VoIP) telephone or device, including a computer or mobile device operating over the Internet, for example. - In operation, a call is initiated by either the far-
side device 402 or the near-side device 418. When a call is active, the transmittingtransducer 404 transmits a transmit-path signal 409 that is received by theAEC processor 406 and themixer 414. Also, the receivingtransducer 405 and theAEC processor 406 receive a receive-path signal 408 from the far-side device 402, through near-side device 418. TheAEC processor 406 outputs anAEC signal 415 to themixer 414, and themixer 414 combines theAEC signal 415 and the transmit-path signal 409 to output a reduced echo-path signal 416 to theNLP module 407. TheNLP module 407 receives the reduced echo-path signal 416 and outputs a processedsignal 417 that is transmitted to the far-side device 402. - The transmitting
transducer 404 and the receivingtransducer 405 may be generally as described above forFIG. 2 . Thus, the transmittingtransducer 404 may be a microphone, and the receivingtransducer 405 may be a loudspeaker. The transmittingtransducer 404 may be integrated into aconnector 412, such as shown diagrammatically inFIG. 4 , or the transmittingtransducer 404 may be located along acable 411. A representative segment of thecable 411 is shown diagrammatically inFIG. 4 . The transmittingtransducer 404 is separated from the receivingtransducer 405 by thecable 411 to structurally isolate the transmittingtransducer 404 from the receivingtransducer 405 and to cause the transmittingtransducer 404 and the receivingtransducer 405 to be separated at a distance. As discussed above, because of this distance, the signal-to-echo ratio improves over what the ratio would be at a closer distance. Thecable 411 may have a variety of suitable lengths, such as those described above for thecable 211. - The
AEC processor 406 and theNLP module 407 operate generally as discussed above forFIG. 1 , and theAEC processor 406 may include an AEC filter or an AEC adaptive filter. That is, theAEC processor 406 may include a signal-processing algorithm that compares the incoming, receive-path signal 408 with the outgoing, transmit-path signal 409 and then subtracts the incoming signal from the outgoing signal. The subtracting of the receive-path signal 408 from the transmit-path signal 409 may be in combination with themixer 414. - Thus, embodiments of the invention may be implemented as an accessory to an existing speakerphone system in a near-
side device 418, such as a speakerphone system built in to a mobile device. When connected to the near-side device 418, thespeakerphone accessory 401 may supplement or replace the existing system. Also, when connected to the near-side device 418, thespeakerphone accessory 401 may signal the near-side device 418 to deactivate the microphone or loudspeaker or both of the near-side device 418. - Accordingly, embodiments of the invention provide a speakerphone with a relatively small form factor but an improved signal-to-echo ratio over conventional small speakerphones by, for example, locating the transmitting transducer remotely from the speakerphone housing containing the receiving transducer. Thus, the transmitting transducer may be located on a connector or a connector cable extending from the housing. In this way, the microphone and the loudspeaker may be separated at a distance without increasing the form factor of the housing. This separation also helps to reduce or eliminate the structural transmission of sound waves that may propagate through the housing. Accordingly, embodiments of the invention may improve the performance of a conventional AEC filter and a conventional NLP module used within the disclosed system.
- The previously described versions of the disclosed subject matter have many advantages that were either described or would be apparent to a person of ordinary skill. Even so, all of these advantages or features are not required in all versions of the disclosed apparatus, systems, or methods.
- Additionally, this written description makes reference to particular features. It is to be understood that the disclosure in this specification includes all possible combinations of those particular features. For example, where a particular feature is disclosed in the context of a particular aspect or embodiment, that feature can also be used, to the extent possible, in the context of other aspects and embodiments.
- Although specific embodiments of the invention have been illustrated and described for purposes of illustration, it will be understood that various modifications may be made without departing from the spirit and scope of the invention.
Claims (21)
1-19. (canceled)
20. A portable speakerphone comprising:
a receiving transducer affixed to a housing;
an electrical cable extending from the housing and having a connector at a distal end of the electrical cable, opposite a proximal end of the electrical cable coupled to the housing, the receiving transducer configured to receive a first electrical signal via the connector;
a transmitting transducer affixed to the electrical cable, remote from the housing, and configured to transmit a second electrical signal; and
an acoustic echo cancellation circuit configured to suppress acoustic echo in the second electrical signal by modifying the second electrical signal based in part on the first electrical signal, and to provide an output of the modified second electrical signal via the connector.
21. The speakerphone of claim 20 wherein the acoustic echo cancellation circuit includes an acoustic echo cancellation processor configured to receive the first electrical signal and the second electrical signal, and further includes a mixer configured to combine an output of the acoustic echo cancellation processor with the second electrical signal.
22. The speakerphone of claim 20 wherein the acoustic echo cancellation circuit further includes a non-linear processing module configured to further suppress acoustic echo by non-linear processing of an output of the mixer.
23. The speakerphone of claim 20 wherein the connector is configured to receive the first electrical signal from a mobile device coupled to the connector.
24. The speakerphone of claim 20 wherein the acoustic echo cancellation circuit provides an output to a mobile device via the connector.
25. The speakerphone of claim 20 wherein the second electrical signal is based in part on an audio signal from the receiving transducer and a voice signal.
26. The speakerphone of claim 25 wherein the voice signal is an analog voice signal.
27. The speakerphone of claim 20 wherein the electrical cable is detachably attached to the housing.
28. The speakerphone of claim 20 wherein the transmitting transducer includes a microphone located along the electrical cable between the proximal end of the electrical cable and the connector.
29. The speakerphone of claim 20 wherein the transmitting transducer includes a microphone affixed to the connector.
30. The speakerphone of claim 20 wherein the transmitting transducer includes a microphone substantially enclosed within the connector.
31. The speakerphone of claim 20 wherein the housing and the electrical cable separate the transmitting transducer and the receiving transducer by more than four inches.
32. The speakerphone of claim 20 wherein the transmitting transducer is a directional microphone.
33. The speakerphone of claim 20 wherein the transmitting transducer includes an array of transmitting transducers.
34. A method of providing an acoustic echo suppressed signal in a portable speakerphone, the method comprising:
receiving a first electrical signal from a mobile device via a connector positioned at a distal end of an electrical cable;
communicating the first electrical signal through the electrical cable to a receiving transducer affixed to a housing, a proximal end of the electrical cable coupled to the housing;
transmitting a second electrical signal from a transmitting transducer affixed to the electrical cable and separated from the receiving transducer by at least about four inches;
suppressing an acoustic echo in the second electrical signal by modifying the second electrical signal based in part on the first electrical signal; and
providing an output of the modified second electrical signal via the connector.
35. The method of claim 34 wherein the second electrical signal is based on an audio signal received from the receiving transducer and an analog voice signal.
36. The method of claim 34 wherein said suppressing an acoustic echo in the second electrical signal includes comparing the first electrical signal with the second electrical signal and subtracting the first electrical signal from the second electrical signal to form the modified second electrical signal.
37. The method of claim 34 wherein said suppressing an acoustic echo in the second electrical signal includes non-linear processing of the modified second electrical signal.
38. A portable speakerphone comprising:
a receiving transducer affixed to a housing;
an electrical cable having a connector at a distal end of the electrical cable that is opposite a proximal end of the electrical cable coupled to the housing, the receiving transducer configured to receive a first electrical signal from a mobile device coupled to the connector;
a transmitting transducer configured to transmit a second electrical signal, the transmitting transducer affixed to the electrical cable and separated from the receiving transducer by at least four inches; and
an acoustic echo cancellation circuit configured to suppress acoustic echo in the second electrical signal based in part on the first electrical signal, and to provide an output signal to a mobile device via the connector.
39. The speakerphone of claim 38 wherein the transmitting transducer includes a microphone affixed to the connector.
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US10674295B2 (en) * | 2018-04-13 | 2020-06-02 | Microsoft Technology Licensing, Llc | Method and system of varying mechanical vibrations at a microphone |
US20230319492A1 (en) * | 2022-03-29 | 2023-10-05 | The Board Of Trustees Of The University Of Illinois | Adaptive binaural filtering for listening system using remote signal sources and on-ear microphones |
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- 2016-11-16 TW TW105137497A patent/TWI783917B/en active
- 2016-11-17 WO PCT/US2016/062596 patent/WO2017087711A1/en active Application Filing
- 2016-11-17 US US15/354,909 patent/US10182160B2/en active Active
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2018
- 2018-10-29 US US16/173,801 patent/US20190174006A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
TWI783917B (en) | 2022-11-21 |
US10182160B2 (en) | 2019-01-15 |
WO2017087711A1 (en) | 2017-05-26 |
US20170142262A1 (en) | 2017-05-18 |
TW201731278A (en) | 2017-09-01 |
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