WO2013078916A1 - Appareil de haut-parleur d'amplification - Google Patents

Appareil de haut-parleur d'amplification Download PDF

Info

Publication number
WO2013078916A1
WO2013078916A1 PCT/CN2012/082543 CN2012082543W WO2013078916A1 WO 2013078916 A1 WO2013078916 A1 WO 2013078916A1 CN 2012082543 W CN2012082543 W CN 2012082543W WO 2013078916 A1 WO2013078916 A1 WO 2013078916A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
host device
sensor coil
audio
audio signal
Prior art date
Application number
PCT/CN2012/082543
Other languages
English (en)
Inventor
Michael Weibin ZHANG
Original Assignee
Zhang Michael Weibin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhang Michael Weibin filed Critical Zhang Michael Weibin
Publication of WO2013078916A1 publication Critical patent/WO2013078916A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/021—Aspects relating to docking-station type assemblies to obtain an acoustical effect, e.g. the type of connection to external loudspeakers or housings, frequency improvement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2227/00—Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
    • H04R2227/003—Digital PA systems using, e.g. LAN or internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/01—Input selection or mixing for amplifiers or loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers

Definitions

  • the present invention relates to short range audio transmission systems. More particularly, the present invention relates to short range inductively coupled audio transmission systems of an accessory device for a portable host device.
  • Portable electronic devices such as mobile phones and tablet computers normally have built-in loudspeakers. Due to the limitation of the sizes, the built-in loudspeakers are often small and low in volume. Amplifying loudspeakers are often used as the accessory for these portable devices. Audio signals are normally transmitted to the amplifying speaker via a wired connector or standard digital wireless connection such as Wi-Fi or Bluetooth.
  • a standard digital wireless communication requires relatively complex circuitry and high power consumption, adding the cost to the accessory.
  • a wired connection requires a physical connector which increases the size of the accessory and creates inconveniences when reconnecting and disconnecting.
  • Inductive audio coupling has been known and used for a long time in the art.
  • Inductive audio coupling is used in hearing aid devices such as the T-Coil and audio-frequency induction loops (AFILs).
  • AFILs audio-frequency induction loops
  • Some short range audio broadcasting systems used in museums also use audio induction loops.
  • both the transmitter and receiver have to be designed in the first place with built-in components for inductive coupling.
  • Another inductive audio coupling device is the telephone pickup coil that has been used to pick up the audio signal from the transducer of a traditional telephone handset.
  • the pickup coils have a limited frequency response and are limited to be used for hands-free operation, telephone recording, monitoring, and spying devices.
  • inductive audio pickups are used by musicians alike to receive and record audio frequency electromagnetic signals from the environment.
  • Inductive sensors and amplifiers are also used in measurement and testing equipments to pick up signals from electrical wires such as a telephone line.
  • the current invention uses inductive audio coupling to pick up audio signal from the built-in small loudspeakers of a ready-made mobile device to feed into an amplifying loudspeaker.
  • the present invention provides an amplifying loudspeaker accessory for ready-made portable devices with built-in loudspeakers.
  • the built-in loudspeaker is normally a moving-coil transducer that produces an electromagnetic field during its operation.
  • the accessory device related to the present invention has a sensor coil which is positioned closely to the host device's built-in loudspeaker to receive the electromagnetic audio signal. The received audio signal is used as the input of an amplifying loudspeaker system.
  • the sensor coil of the accessory device related to the present invention is positioned closely to the loudspeaker to obtain a high enough signal-to-noise ratio.
  • the signal received by the sensor coil can also be used for control and data transmission as described in another patent application with the same assignee of the current application.
  • An apparatus for an amplifying loudspeaker includes a sensor coil, a pre-amplifier and equalizer module, an audio amplifier and loudspeaker module, a CPU module, and an input and output module.
  • One of the embodiments for the current invention is a wireless speaker for mobile phones and mobile media players.
  • Figure 1 is a block diagram showing the wireless speaker of the present invention.
  • Figure 2 describes a preferred embodiment as a portable wireless amplifying speaker for mobile phones and media players.
  • Figure 3 is a block diagram showing a structure of the current invention that includes multiple sensor coils.
  • Figure 4 is a block diagram showing manual switching for multiple sensor coils.
  • Figure 5 is a block diagram showing an automatic switching mechanism for multiple sensor coil selection.
  • Figure 6 describes a preferred embodiment as an amplifying speaker stand for a tablet computer.
  • Figure 7 describes a structure to support both portrait and landscape positioning of the host device.
  • Figure 8 describes a preferred embodiment as a hands-free car kit for mobile phones.
  • Figure 9 is a block diagram showing a host device with a dedicated built-in transmitter coil.
  • Figure 10 describes a preferred embodiment in which a transmitter coil is added in the accessory device.
  • Figure 11 is a block diagram showing that a noise cancellation coil is added.
  • Figure 1 describes an embodiment of the current invention that serves as a wireless speaker accessory 2 to work with a host device 2.
  • the host 1 is a potable device with at least one built-in speaker such as a mobile phone, audio/video player, portable gamming console or computer.
  • the host 1 is essentially a computer system that is capable of producing sound as one of its outputs.
  • the accessory device 2 comprises a sensor coil 21 , a pre amplifier and equalizer 22, an audio amplifier 24 and at least one loudspeaker 25, a CPU module 23 with input and output interfaces, and a power module 26.
  • the host device 1 is a ready made product with at least one built-in loudspeaker 11 positioned at a fixed location inside the host 1 .
  • the sensor coil 21 inside the accessory is placed near the loudspeaker 11 in order to receive the maximum amount of electromagnetic signal generated by the coil inside the loudspeaker 11 .
  • the pre-amplifier 22 amplifies the signal from the sensor coil 21 to be suitable for the audio amplifier 24.
  • the equalizer is essential one or more filters to compensate the frequency response of the entire system so as to produce better quality sound.
  • Normal audio signals are amplified by the audio amplifier 24 and output to loudspeaker 25 to be heard by the user.
  • the sound from the host device 1 is significantly amplified without the needs of altering and adjusting any software or hardware inside the host device 1 .
  • CPU module 23 with input and output interfaces are mainly used for control of the accessory 2.
  • the input and output interfaces include switches or lights that are used to control and display the status of the accessory, such as power on/off, and volume adjustment.
  • the CPU module 23 can serve as power management controller for the accessory 2.
  • the control functions include turn on and off the audio amplifier 24 automatically.
  • the CPU module receives 23 the sensed signals from the pre-amplifier 22 and analyses the signals to determine sound or music is being played.
  • the CPU module 23 then sends the corresponding control signal to enable or power up the audio amplifier 24.
  • the CPU module 23 can detect this status and disable or power down the audio amplifier 24.
  • the audio signal picked up from loudspeaker 11 of host 1 can be normal sound, voice or music, or encoded audio signal such as DTMF tones generated by the host's existing functionality such as dialing.
  • a software package designed to work with the accessory 2 can also be installed in host 1 to generate encoded signals to be received by sensor coil 21 and processed by CPU module 23.
  • the encoded signals can carry controlling commands for the accessory such as volume up or down, mute, equalizer adjustment. These controlling signals can be decoded by the CPU module 23 and used to control the pre-amplifier and equalizer 22, audio amplifier 24, and other modules in the accessory.
  • the frequency response for this sensor coil/loudspeaker coupling is not uniform for most types of host device. Often the low frequency signals are prevented from going to the loudspeaker 11 of the host 1 because of the small size of the loudspeaker 11 .
  • the sensor coil 21 is designed to receive the most signals from the loudspeaker 11 .
  • the pre-amplifier and equalizer 22 compensate for this and allow the overall audio system to have a flatter frequency response.
  • a digital signal processor (DSP) that serves as a precise equalizer can help to achieve a better frequency response.
  • the DSP can also regenerate or simulate the low frequency signals that are cut off before sending to the loudspeaker 11 .
  • Digital signal processing means can also be applied to an added music playback software package inside the host device 1 to compress the music into a frequency range that is suitable to be transmitted via the existing host device 1 .
  • the DSP inside the pre-amplifier 22 then decompress the music to reproduce the music.
  • Figure 2 describes a preferred embodiment as a portable wireless amplifying speaker for mobile phones and media player.
  • the accessory device 2 has a form of a small stereo amplifying speaker.
  • the host device 1 can be a mobile phone or mobile media player such as an iPhone.
  • the sensor coil 21 inside the amplifying speaker 2 is located beneath the top surface.
  • the host device 1 can rest on top of the amplifying speaker 2. Sound from the host device 1 is picked up and amplified by the amplifying speaker 2.
  • the locations of the built-in speaker or speakers of different models of host devices are different.
  • the position of the host device 1 related to the amplifying speaker 2 may need to be adjusted so that the loudspeaker 11 is right on top of the sensor coil 21 .
  • This adjustment action may be viewed by some end users as troublesome and the final position may not be symmetrical.
  • multiple sensor coils can be placed in the selected position to make the amplifying speaker 2 more compatible with more host devices.
  • Figure 3 describes a preferred embodiment of the current invention that includes multiple sensor coils.
  • One or more extra sensor coils 27 are placed in positions that suit as many existing host devices as possible to allow maximum compatibility.
  • a certain type of host 1 is put on top of the accessory device 2, one or more of the sensor coils will match the speaker or speakers of the host 1 .
  • the matched sensor coil or coils will pick up the audio signals from the host 1 and pass them to the pre-amplifier.
  • manual switches 28 are added to connect only the sensor coils that are useful for a certain model of host device 1 to the pre-amplifier 22.
  • the user can place the host device 1 with music playing in position with the accessory device 2 to try for the most suitable switch setting.
  • this manual switch approach may be viewed by some users as troublesome.
  • FIG. 5 describes an automatic switching mechanism for multiple sensor coil selection.
  • Each sensor coil 21 is connected to the pre-amplifier 30 via an electronic switch 29 that is controlled by the CPU module 23.
  • the electronic switch 29 is enabled one by one in turn by the CPU module 23 for the CPU module 23 to detect which sensor coil is receiving strong music signals.
  • the CPU will determine which sensor coils are receiving the useful audio signal and which sensor coils are receiving interference or no signal.
  • the electronic switches for the sensor coils that are receiving useful audio signal will be turned on as the result of the automatic configuration process.
  • the automatic configuration process can be started manually by the end user pressing a button.
  • the automatic configuration process can also be started automatically each time when a music playing session begins. This is useful as the accessory device can be shared by different users with different host device. Quick and automatic configuration is one of the advantages of the current invention.
  • Another embodiment of the current invention allows the sensor coil(s) to be repositioned physically to suit different host devices. A smaller number of sensor coils will be needed than the multiple sensor coil approach.
  • Different mechanical structures and designs can be used to allow the users to adjust the position of the sensors coils to match their particular type of host device.
  • the mechanism and structure are also be used to keep the host and accessory in position relating to each other.
  • the accessory device can be a speaker stand for a tablet computer such as the iPad that not only amplifies the sound but also supports the iPad in the right positions for being used or viewed by the user.
  • Figure 6 describes a preferred embodiment as a speaker stand for a tablet computer such as the iPad from Apple.
  • the stand can support the host device in both portrait and landscape positions. In different positions, the locations of the speakers of the host device related to the speaker stand are different.
  • Multiple sensors can be placed inside one accessory device to match the same host device for different kinds of positioning.
  • a set of sensor coils can be placed to support the portrait positioning of the host and another set of sensor coils can be placed to support the landscape positioning of the host.
  • more than two sets of sensor coils can be built-in to the accessory device. As described in Figure 7, two sets of sensor coils are placed in the matching positions to pick up the audio signals properly for both portrait and landscape operations for the first model of the tablet computer. Another two sets of sensor coils are positioned for the second model of the tablet computer. The sensors coils are selected by manual switching or automatic switching.
  • Figure 8 describes a preferred embodiment as a hands-free car kit for mobile phones.
  • the sensor coil 21 in the hands-free car kit 2 picks up the voice signal and feeds it to the amplifying speaker.
  • the loudspeaker 25 is mounted towards the user for the user to get a clearer reception and to avoid echo.
  • a simple sound reflector 33 is included to amplify acoustically the sound reaching the microphone 12 of the mobile phone 1 . The sound reflector increases the transmitting sensitivity of the entire speaker phone system.
  • Figure 9 describes a host device 4 with a dedicated built-in transmitter coil 41 that couples the audio signal to the sensor coil 21 in the accessory device.
  • the transmitter coil 41 can be connected to the loudspeaker 11 in parallel to transmit whatever signal which is passed to the loudspeaker 11 .
  • the resistance of the transmitter is a few times greater than the built-in loudspeaker's so as to not affect much the performance of the loudspeaker.
  • the transmitter coil can be driven by a separated amplifier that can be controlled by a CPU module inside the host device.
  • the transmitter coil can also be used as an input sensor to receive audio signal and/or encoded audio signal to form a two way inductive communication system between a host and an accessory, or between two hosts.
  • Figure 10 describes a preferred embodiment in which a transmitter coil 31 is added in the accessory device.
  • a second accessory device can be linked to the first accessory device wirelessly.
  • a third accessory device can be linked to the second accessory device wirelessly, and so on, forming a chain to work together.
  • the phases of the transmitted signal need to be coordinated correctly to ensure that the sound coming out from different accessory devices adds up instead of interfering with each other.
  • Sensor coil 21 can pick up environmental electro-magnetic noises. For example power lines or transformers nearby can generate noises in the audible frequency range. Generators or motors nearby can also generate audible electro-magnetic noises.
  • a noise cancellation sensor coil 41 is added as described in Figure 11 .
  • the noise cancellation sensor coil 41 is positioned physically in parallel to the main sensor coil 21 , but far away from the host device's internal speaker 11 .
  • the two sensor coils are connected to the pre-amplifier 22 in a subtractive way.
  • the noise signals received from sensor coil 21 and from sensor coil 41 are almost the same, so they cancel out each other. Because the noise cancellation sensor coil 41 is not close to the host device's internal speaker 11 , the intended electro-magnetic audio signal is received only by the sensor coil 21 and will not be cancelled out.
  • one of the significant advantages of the inductive audio coupling mechanism is that receiver requires little power.
  • the other advantage is that no configuration process for the user is needed.
  • the third advantage is the low cost as transmitter and receiver are essentially coils.
  • the disadvantage is that the frequency response is poorer, distortion can be greater and S/N ratio can be lower than digital systems.
  • the lack of sound quality is compensated by the other advantages.
  • the inductive coupling means can also be used together with the existing wireless digital transmission means such as Bluetooth or wired cable to form a higher quality amplifying speaker.
  • the built-in speaker system inside the host unit can be mono or stereo.
  • the accessory device can also be mono or stereo. This description uses mono examples. For a stereo configuration, all the sensors coils, and amplifiers and speakers will have two channels.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'invention concerne un appareil de haut-parleur d'amplification pour un dispositif hôte existant comprenant une bobine de capteur destinée à recevoir un signal audio sous une forme électromagnétique à partir d'un haut-parleur interne du dispositif hôte; un module de préamplificateur et d'égaliseur connecté à la bobine de capteur destiné à amplifier et égaliser le signal audio à une réponse de fréquence et de niveau adéquate; et un amplificateur de puissance audio et un haut-parleur destinés à reproduire le son pour le signal audio.
PCT/CN2012/082543 2011-12-01 2012-10-08 Appareil de haut-parleur d'amplification WO2013078916A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161629888P 2011-12-01 2011-12-01
US61/629,888 2011-12-01

Publications (1)

Publication Number Publication Date
WO2013078916A1 true WO2013078916A1 (fr) 2013-06-06

Family

ID=48534669

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/082543 WO2013078916A1 (fr) 2011-12-01 2012-10-08 Appareil de haut-parleur d'amplification

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WO (1) WO2013078916A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013128079A1 (fr) * 2012-02-29 2013-09-06 Nokia Corporation Connexion de dispositifs terminaux
US9351066B2 (en) 2013-08-19 2016-05-24 Designpoint Industrial Design Studio, Inc. Expandable speaker
CN106160679A (zh) * 2015-04-08 2016-11-23 钟武清 一种专业音频放大器
US10397677B1 (en) 2018-09-07 2019-08-27 Pow Audio Inc. Portable speaker apparatus and method
GB2589709A (en) * 2019-09-10 2021-06-09 Tymphany Acoustic Tech Ltd Speaker system and speaker configuration method
USD926727S1 (en) 2018-09-07 2021-08-03 Pow Audio Inc. Combined portable speaker and attachment
USD928119S1 (en) 2019-03-05 2021-08-17 Pow Audio Inc. Portable speaker
USD948478S1 (en) 2019-03-05 2022-04-12 Pow Audio Inc. Portable speaker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201025733Y (zh) * 2007-01-08 2008-02-20 田君儒 Mp3、mp4有源音箱
WO2008068724A1 (fr) * 2006-12-06 2008-06-12 Nano Magic Technologies Sarl Écouteurs sans fil invisibles à aimant au lanthanide
US20080175427A1 (en) * 2006-12-06 2008-07-24 Shu Ting Chen Portable speaker apparatus and system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068724A1 (fr) * 2006-12-06 2008-06-12 Nano Magic Technologies Sarl Écouteurs sans fil invisibles à aimant au lanthanide
US20080175427A1 (en) * 2006-12-06 2008-07-24 Shu Ting Chen Portable speaker apparatus and system
CN201025733Y (zh) * 2007-01-08 2008-02-20 田君儒 Mp3、mp4有源音箱

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013128079A1 (fr) * 2012-02-29 2013-09-06 Nokia Corporation Connexion de dispositifs terminaux
US9577710B2 (en) 2012-02-29 2017-02-21 Nokia Technologies Oy Engaging terminal devices
US9351066B2 (en) 2013-08-19 2016-05-24 Designpoint Industrial Design Studio, Inc. Expandable speaker
CN106160679A (zh) * 2015-04-08 2016-11-23 钟武清 一种专业音频放大器
US10397677B1 (en) 2018-09-07 2019-08-27 Pow Audio Inc. Portable speaker apparatus and method
USD926727S1 (en) 2018-09-07 2021-08-03 Pow Audio Inc. Combined portable speaker and attachment
US11109127B2 (en) 2018-09-07 2021-08-31 Pow Audio Inc. Portable speaker apparatus and method
USD928119S1 (en) 2019-03-05 2021-08-17 Pow Audio Inc. Portable speaker
USD948478S1 (en) 2019-03-05 2022-04-12 Pow Audio Inc. Portable speaker
GB2589709A (en) * 2019-09-10 2021-06-09 Tymphany Acoustic Tech Ltd Speaker system and speaker configuration method
GB2589709B (en) * 2019-09-10 2021-12-08 Tymphany Acoustic Tech Ltd Speaker system and speaker configuration method

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