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Volume control for audio signals

Patent Number: RE43132
Publication Date: 2012-01-24
Inventor: Jacobs, Stephen M.

A motion picture soundtrack reproduction system has a center front soundtrack channel and a plurality of other soundtrack channels. A volume control adjusts the gain of all the channels. The volume control has a range of settings from a minimum to a maximum, the gain of the center front channel having substantially a first relationship to the volume control settings and the gain of the other channels having substantially a second relationship to the volume control settings, the ...

Microphone with pressure relief

Patent Number: 8111871
Publication Date: 2012-02-07
Inventors: Judy, Michael W.; Zhang, Xin; Weigold, Jason W.; Harney, Kieran P.

A microphone has a movable diaphragm having a rest position, a stationary portion, and a set of springs movably coupling the diaphragm and the stationary portion. The diaphragm and stationary portion are spaced a first distance when the diaphragm is in the rest position. When not in the rest position, however, the diaphragm and stationary portion are capable of being spaced a second distance, which is greater than the first distance. Despite the change in distance, the diaphragm still is ...

Electrodynamic transducer and use thereof in loudspeakers and geophones

Patent Number: 8111870
Publication Date: 2012-02-07
Inventors: Richoux, Bernard; Lemarquand, Guy; Lemarquand, Valérie

An electrodynamic transducer includes a frame and contains at least one electric coil which is placed in a static magnetic field and which can move about a rest position in a vertical free space. The coil(s) is wound around and fixed to a mandrel and a return member is used to return the coil-bearing mandrel to the rest position in the absence of an external bias, the straight cylinder defining an inner volume and an outer volume. The magnetic field is produced by outer and inner magnetic ...

Speaker device

Patent Number: 8111869
Publication Date: 2012-02-07
Inventors: Oizumi, Hiroya; Horigome, Minoru; Nagasawa, Takuei; Sato, Hiroshi

A speaker device includes a damper allowing high linearity. The speaker device includes a vibration body including a damper and a voice coil bobbin (bobbin), and a magnetic circuit having a plate. The damper has a first member arranged opposite the plate, and a second member projecting on a side of the plate from the first member. The first member has a movable part elastically supporting the bobbin. The movable part is a flat plate, and behaves with respect to a bent part provided between ...

Speaker device

Patent Number: 8111868
Publication Date: 2012-02-07
Inventor: Kaiya, Teruaki

A drive cone 11 and a diaphragm 14 are integrally driven by a voice coil 6 movably disposed in a magnetic gap 5. Peripheral edge portions of the drive cone 11 and the diaphragm 14 are supported by a frame 12 via different edge portions 13 and 15, respectively.

The drive cone 11 is provided with a rising-up portion 11a which rises up toward an acoustic radiation direction from a inner circumferential ...

Electronic device with a speaker

Patent Number: 8111867
Publication Date: 2012-02-07
Inventor: Wu, Chin-Hung

An electronic device (100) having a speaker (30) located in a sealed and separate speaker enclosure is described. The electronic device includes a housing (20), a circuit board (70), a cover (60), and two connecting bodies (50). The housing includes a cavity (22) defined therein for receiving the speaker. The circuit board is electrically connected to the speaker. The cover has through holes (622) defined thereon and is disposed ...

Storage rack

Patent Number: 8111866
Publication Date: 2012-02-07
Inventors: Shima, Takashi; Niinuma, Shingo; Miura, Koji; Watanabe, Toshiki

A storage rack capable of storing an audio apparatus is provided. The storage rack includes: a top board portion, at least two leg portions, a shelf board portion, and a speaker storage portion. The top board portion supports the audio apparatus. The at least two leg portions hold the top board portion. The shelf board portion is vertically joined to a side surface of the respective leg portions and in parallel with the top board portion with an adjustable distance thereto. The speaker ...

Flat panel speaker mounting system

Patent Number: 8111865
Publication Date: 2012-02-07
Inventor: Lau, Ka Wai

An apparatus for mounting two speakers to a flat panel display device is disclosed wherein the device, utilizing standardized mounting plates provided in such flat panel display devices, enables the mounting of two speakers while providing the ability to change speaker position in regards to six different position parameters. The apparatus may be utilized in conjunction with flat panel mounting devices, such as pedestal, wall or ceiling mounts, or utilized independently thereof. More ...

Earbud adapter

Patent Number: 8111864
Publication Date: 2012-02-07
Inventors: Venem, Michael T.; Babcock, Martin P.; Oliveira, Robert J.

Adapters for use with sound devices and methods for making and using the same. In some embodiments, an example adapter may include an adapter body having a first side, a port or projection extending from the first side, and a second side. The second side is generally configured to be attachable to a sound device such as an earbud or earbud-type of headphone. The projection may include a sleeve attached thereto. The projection and sleeve are generally configured to at least in part extend ...

Earbud adapter

Patent Number: 8111863
Publication Date: 2012-02-07
Inventors: Venem, Michael T.; Babcock, Martin P.; Oliveira, Robert J.

Ear-hanging microphone

Patent Number: 8111862
Publication Date: 2012-02-07
Inventor: Wu, Ying Jui

An ear-hanging microphone comprising; a c-shaped hanger; a cable pole, whose first end connecting said hanger at a first end thereof; a flexible strap, whose two ends being twisted on said hanger, and the length of said flexible strap being shorter than the longest one of the diameters of said hanger; a microphone, which connecting said cable pole at a second end thereof; a stop block, which connecting said hanger at a second end thereof; a socket, which being embedded in said stop block, ...

Earbud that secures to the tragus and anti-tragus of the ear

Patent Number: 8111861
Publication Date: 2012-02-07
Inventor: Lowry, David

An earphone projects sound into an ear having an acoustic meatus, a tragus, an intertragic notch, an anti-tragus and a canal. The earphone includes a base that is positioned proximate an outer surface of the tragus and anti-tragus when the earphone is mounted to the ear. A speaker housing at least partially contacts the acoustic meatus of the ear and includes a speaker cover positioned proximate the canal when the earphone is mounted to the ear. First and second tragus lobes extend from the ...

Recreational bone conduction audio device, system

Patent Number: 8111860
Publication Date: 2012-02-07
Inventors: Retchin, Sheldon M.; Lenhardt, Martin

A waterproof recreational audio device and method that transmits sound via transcutaneous bone conduction provides high fidelity musical signals to a user. The device can be worn on the head of a user and integrated into various types of headgear. The device is tunable for sound quality and comfort by adjusting and moving the sound transmitting transducers around the head of the user. The present invention uses commercially available transducers to produce sounds in the low, mid and high ...

Headgear and integrated music player

Patent Number: 8111859
Publication Date: 2012-02-07
Inventor: Phillips, Aaron M.

A headgear assembly is provided with an integrated music or other sound player supportable therein. The headgear assembly includes a headband or cap with pouches therein for various portions of the music player. In particular, a left speaker pouch is provided for a left speaker, a right speaker pouch is provided for a right speaker and a player pouch is provided for a sound player. A wire harness is also provided to preferably removably attach the speakers to the sound player. The headband ...

Supra-aural headphone noise reducing

Patent Number: 8111858
Publication Date: 2012-02-07
Inventor: Sapiejewski, Roman

An earphone for a supra-aural noise reducing headphone, with a front cavity that includes a foam portion and an open passageway. The foam portion supplements the volumetric dimension of the passageway to improve passive ...

In-ear headset and in-ear earphone

Patent Number: 8111857
Publication Date: 2012-02-07
Inventors: Marten, Stefan; Kuhtz, Jan Peter

The invention relates to a headset comprising at least one earphone and a headset microphone for registering voice signals of the headset wearer. The headset microphone is fixed to one of the earphones. The earphone comprises at least one electroacoustic transducer, a rear volume, and a front volume which lies in front of the electroacoustic transducer. A first channel runs from the exterior through the earphone to the front volume. In addition, at least one acoustic filter and/or a ...

Variable directional microphone unit and variable directional microphone

Patent Number: 8111856
Publication Date: 2012-02-07
Inventors: Akino, Hiroshi; Shimura, Haruhito

A variable directional microphone unit includes two capacitor elements. Each of the two capacitor elements has: a back plate formed on one side of an insulating plate to be insulated from a back plate of the other capacitor element; and a vibrating plate disposed to face the back plate with a certain amount of space therebetween, in which a polarization voltage is applied between each of the back plates and the vibrating plates so that an electroacoustically transduced signal is obtainable ...

Microphone assembly and a portable electronic device using the microphone assembly

Patent Number: 8111855
Publication Date: 2012-02-07
Inventors: Chan, Kai-Po; Cheng, Chao-Yuan; Tseng, Chao-Kun

A microphone assembly (10) using in a portable electronic device includes a fixing component (12) detachably fixed to a housing (30) of the portable electronic device, and a main microphone body (14) latched to the fixing component (12). The microphone assembly (10) may be conveniently detached and increases reliability of the housing ...

Methods and apparatus for sound production

Patent Number: 8111854
Publication Date: 2012-02-07
Inventor: Peng, Yan-Ru

Electrical signals corresponding to sound are received at a wire, and sound is generated at a speaker connected to the wire. The sound is resonated in a cavity of a shell housing the speaker, and then passed along a transmission tube toward a pinna of a user's ear without directing the sound directly toward the user's ear ...

Dual mode earphone with acoustic equalization

Patent Number: 8111853
Publication Date: 2012-02-07
Inventor: Isvan, Osman Kemal

In one embodiment, a dual-mode earphone is provided, comprising a first earbud including a speaker with a diaphragm and at least one acoustic port in front of the diaphragm, and a cap in front of the speaker. The speaker or the cap is configured to move relative to the other for opening and closing the acoustic port in one embodiment and a movable seal is provided in another embodiment. The earphone further includes a second earbud housing operably coupled to the first earbud opposite the ...

Hearing aid with component mounted in the housing by a damping clip

Patent Number: 8111852
Publication Date: 2012-02-07
Inventors: Koo, Wee Haw; Tan, Beng Hai; Ho, Wai Kit David

A hearing aid has at least one converter element which, in order to reduce mechanical vibrations, is flexibly attached inside or at the hearing aid housing. The converter is mounted in the housing by at least one clip that flexibly is moveable or displaceable in its range of action like a spring, in order to damp and attach the converter ...

Hearing aid with adaptive start values for apparatus

Patent Number: 8111851
Publication Date: 2012-02-07
Inventors: Hamacher, Volkmar; Giesner, Arthur

Fine customization of a hearing aid to the individual hearing environments and habits of a user are to be simplified and improved. To this end, when the hearing aid is turned on or when the hearing aid is switched to a particular operating mode, neither the value most recently valid for the parameter prior to turning off or switching to a different operating mode nor the parameter value transferred to the hearing aid at the beginning of programming is set. Rather, from the changes to the ...

Method for adjusting a hearing device with a standardization of processing values

Patent Number: 8111850
Publication Date: 2012-02-07
Inventors: Messmer, Michael; Steinbuss, Andre

A hearing device wearer is to have improved possibilities of being able to perform a fine adjustment of his/her hearing device according to a basic setting. To this end, each processing value of a multi-channel processing system is standardized, in particular a filter bank, to a respectively associated basic setting value. A fine adjustment of the processing values to the hearing device wearer can now be carried out in relation to the standardized processing values starting from a ...

Hearing aid

Patent Number: 8111849
Publication Date: 2012-02-07
Inventors: Tateno, Makoto; Nakao, Katsuya

A hearing aid which achieves a comfortable feeling to use while preventing generation of howling includes a microphone for converting an environmental sound to an electric signal, a hearing aid processor for hearing aid processing of an output signal of the microphone, an earphone for converting an output signal of the hearing aid processor to a sound signal, an external ear canal microphone converting a sound within an external ear canal to an electric signal, and an adaptive filter for ...

Hearing aid with acoustical signal direction of arrival control

Patent Number: 8111848
Publication Date: 2012-02-07
Inventors: Roeck, Hans-Ueli; Cadalli, Nail; Bachler, Patrick

Acoustical signals from the acoustical surrounding (U) which impinge upon a reception unit 30 are evaluated and direction of arrival (DOA) of such signals is determined. From signals indicative of such direction of arrival (DOA) a histogram is formed in unit 32. The behavior of such histogram is classified under different aspects or criteria and dependent on classification results in a classifying unit 34 the hearing device and thereby especially its signal transfer ...

Electret materials, electret speakers, and methods of manufacturing the same

Patent Number: 8111847
Publication Date: 2012-02-07
Inventors: Wu, Wen-Jong; Hsiao, Wen-Hsin; Lee, Chih-Kung; Ko, Wen-Ching; Chen, Jia-Lun; Lee, Shih-Yuan; Leu, Ing Yih

A speaker comprises at least one electrode electrically coupled with an audio signal input and a film comprising at least one electret layer. The film is configured to interact with the electrode in response to an audio signal supplied by the audio signal input and to vibrate to generate sound waves. The electret layer is formed from a polymer-containing ...

Low distortion switching amplifier circuits and methods

Patent Number: 8111846
Publication Date: 2012-02-07
Inventors: Takagishi, Hideto; Wu, Alan; Zhang, Wolf

Embodiments of the present invention include switching amplifier circuits and methods. In one embodiment, the present invention includes a low distortion method of driving a switching amplifier comprising modulating an audio input signal to produce a half-wave rectified pulse-width modulated signal and a complementary half-wave rectified pulse-width modulated signal. These signals may be amplified in a power amplifier and combined in a feedback circuit to generate a first feedback signal ...

System having a pulse width modulation device

Patent Number: 8111845
Publication Date: 2012-02-07
Inventor: Braun, Christoph

A system, a device and a method for pulse width modulation is disclosed. One embodiment includes a pulse width modulation device, a first pulse width modulation mapper for pulse width modulation of a data signal, or a signal derived therefrom, and a second pulse width modulation mapper for pulse width modulation of a reference signal, or a signal derived therefrom. In one or more embodiments, the data signal e.g., can be a signal for a mono audio channel, or a signal for a stereo audio ...

Semiconductor integrated circuit and condenser microphone

Patent Number: 8111844
Publication Date: 2012-02-07
Inventor: Watanabe, Daisuke

A semiconductor integrated circuit for a condenser microphone according to one exemplary aspect of the present invention includes a first resistor, a second resistor, a power supply terminal, a first capacitor, and a first diode. The first resistor and the second resistor are connected between a drain of an output transistor and an output terminal in series. The power supply terminal is connected to a source of the output transistor. The first capacitor is arranged between the power supply ...

Compensation for nonuniform delayed group communications

Patent Number: 8111843
Publication Date: 2012-02-07
Inventors: Bekiares, Tyrone D.; Newberg, Donald G.; Logalbo, Robert D.

A method for synchronizing audio reproduction in collocated end devices is presented. Each of the devices auto-correlates using noise to determine a threshold prior to the antenna receiving an audio signal. When the devices receive a common audio signal, they provide audio outputs. Each device cross-correlates its audio output with the audio outputs of the other devices. The timing of the audio output of each device is then adjusted such that the audio outputs of all of the devices align ...

Filter adaptation based on volume setting for certification enhancement in a handheld wireless communications device

Patent Number: 8111842
Publication Date: 2012-02-07
Inventor: Seguin, Chad G.

A handheld wireless communications device has an adjustable volume setting. The communications device also has a downlink audio processor containing a digital audio filter. Storage in the device contains a first set of filter coefficients that configure the filter to enable the device to pass a wireless communications device certification process while sacrificing sound quality, at a low volume setting. The storage also contains a second set of filter coefficients that configure the filter ...

Audio input/output device and method for switching input/output functions

Patent Number: 8111841
Publication Date: 2012-02-07
Inventor: Ibe, Yukiyasu

Using a 4-pin audio jack, 3-pin signal interfaces including the ground interface are assigned with conventionally used earphone/microphone functions (one microphone input and one speaker output), while the other interface corresponding to the fourth pin is assigned with a function of microphone input for voice recognition in high noise environment. This function is made effective only when a connected audio device requires such ...

Echo reduction system

Patent Number: 8111840
Publication Date: 2012-02-07
Inventors: Roessler, Martin; Haulick, Tim; Schmidt, Gerhard Uwe

A system for reducing an echo and/or a residual echo in a microphone output signal includes an echo compensation filter configured to receive audio input signals and generate an estimated echo signal. A speech activity detector is configured to detect speech of a local speaker, and a combining circuit is configured to generate an echo compensated signal by subtracting the estimated echo signal from the microphone output signal. A residual echo reduction circuit is configured to suppress the ...

Always on headwear recording system

Patent Number: 8111839
Publication Date: 2012-02-07
Inventors: Goldstein, Steven Wayne; Usher, John

A system that records audio and stores the recording is provided. The system includes first and second monitoring assemblies mounted in an earpiece that occludes and forms an acoustic seal of an ear canal. The first monitoring assembly includes an ambient sound microphone (ASM) to monitor an ambient acoustic field and produce an ASM signal. The second monitoring assembly includes an ear canal microphone (ECM) to monitor an acoustic field within the ear canal and produce an ECM signal. The ...

Conferencing apparatus for echo cancellation using a microphone arrangement

Patent Number: 8111838
Publication Date: 2012-02-07
Inventors: Ono, Natsushi; Tokuda, Toshimichi; Yuge, Ryoichi

A voice conference apparatus includes a sound collecting unit and a loudspeaker, while the sound collecting unit has a directional polar sensitivity characteristic which has a higher sensitivity with respect to sounds which are radiated from at least one direction, as compared with sounds radiated from other directions. The sound collecting unit of the voice conference apparatus has a plurality of omnidirectional microphones, and forms a desirable sensitivity characteristic. Since the ...

Data-driven media management within an electronic device

Patent Number: 8111837
Publication Date: 2012-02-07
Inventors: Rostaing, Andrew; Guetta, Anthony J.

A method and apparatus for intelligently routing and managing audio signals within an electronic device is disclosed. The routing is responsive to a set of logical and physical policies which are stored in data tables which can be updated as ...

System and method using a phased array of acoustic generators for producing an adaptive null zone

Patent Number: 8111836
Publication Date: 2012-02-07
Inventor: Graber, Curtis E.

A performance venue with a main speaker system is provided having a target coverage area within the performance venue. A performance area is located within the performance venue outside the target coverage area of the main speaker system. A low frequency directed audio source is positioned with respect to the performance area for active cancellation of low frequency sound spilling over into the performance area from the main speaker system. Control of the low frequency directed audio source ...

Active noise control apparatus

Patent Number: 8111835
Publication Date: 2012-02-07
Inventors: Takahashi, Akira; Inoue, Toshio; Sakamoto, Kosuke; Kobayashi, Yasunori

A subtractor subtracts an echo canceling signal from a canceling error signal to estimate the resonant noise to be silenced at a position of a microphone, and outputs a first basic signal representing the estimated resonant noise as an input signal supplied to a controller. In the controller, a delay filter generates a second basic signal by delaying the first basic signal by a time value. The controller generates a control signal based on the first basic signal and the second basic ...

Vehicular active noise control system

Patent Number: 8111834
Publication Date: 2012-02-07
Inventors: Takahashi, Akira; Inoue, Toshio; Sakamoto, Kosuke; Kobayashi, Yasunori

A frequency detecting circuit estimates the frequency fp of a propeller shaft based on the frequency fc of vehicle speed pulses, and calculates a control frequency fp′ which is a harmonic of the frequency fp. A basic signal generator generates a basic cosine wave signal xp1 and a basic sine wave signal xp2 of the control frequency fp′. Adaptive filters and an adder generate a control signal Scp for canceling a driveline noise produced in a passenger compartment by the ...

Method of reducing residual acoustic echo after echo suppression in a “hands free” device

Patent Number: 8111833
Publication Date: 2012-02-07
Inventor: Seydoux, Henri

The method comprises, in the time domain, echo cancellation processing (40) by subtracting from the microphone signal a reference signal delivered by an adaptive circuit for modeling the acoustic coupling between the microphone (18) and the loudspeaker (16). Successive frames of the signal are subjected in the frequency domain to processing (42) for suppressing the residual echo that remains after the echo cancellation, together with noise reduction processing ...

Method of adjusting acoustic impedances for impedance-tunable acoustic segments

Patent Number: 8111832
Publication Date: 2012-02-07
Inventors: Jones, Michael G.; Nark, Douglas M.; Jones, Kennie H; Parrott, Tony L.; Lodding, Kenneth N.

A method is provided for making localized decisions and taking localized actions to achieve a global solution. In an embodiment of the present invention, acoustic impedances for impedance-tunable acoustic segments are adjusted. A first acoustic segment through an N-th acoustic segment are defined. To start the process, the first acoustic segment is designated as a leader and a noise-reducing impedance is determined therefor. This is accomplished using (i) one or more metrics associated with ...

Acoustic apparatus, time delay computation method, and recording medium

Patent Number: 8111831
Publication Date: 2012-02-07
Inventors: Itabashi, Tetsunori; Asada, Kohei

An acoustic apparatus includes a positive value conversion section configured to convert, into a positive value, a response signal obtained by collecting a test signal emitted from a speaker using a microphone; a detection section configured to detect a first transient response part that becomes a first mountain portion of the converted response signal; an estimation section configured to estimate a rise point of the converted response signal from at least N points that contain a peak ...

Method and apparatus to provide active audio matrix decoding based on the positions of speakers and a listener

Patent Number: 8111830
Publication Date: 2012-02-07
Inventors: Arora, Manish; Moon, Han-gil

An active audio matrix decoding method and apparatus to generate multi-channel audio signals from a stereo channel audio signal. The method includes extracting characteristics of a plurality of speaker signals and angles of each of a plurality of multi-channel speakers from arbitrary signals reproduced by the multi-channel speakers, decoding a stereo signal into a plurality of multi-channel signals and correcting the decoded multi-channel signals based on the extracted characteristics of ...

Method and apparatus for encoding and decoding stereo signal and multi-channel signal

Patent Number: 8111829
Publication Date: 2012-02-07
Inventors: Kudryashov, Boris; Kim, Jung-hoe; Oh, Eun-mi; Choo, Ki-hyun; Petrov, Sergey

Provided are a method and apparatus for encoding and decoding a stereo signal or a multi-channel signal. According to the method and apparatus, a stereo signal or a multi-channel signal can be encoded and/or decoded by generating parameters based on a mono ...

Loudspeaker diaphragm and method for manufacturing a loudspeaker diaphragm

Patent Number: 8107667
Publication Date: 2012-01-31
Inventors: Sporer, Thomas; Beer, Daniel; Brix, Sandra; Gensicke, Heinz; Kuster, Martin

A loudspeaker diaphragm includes a tapering edge region. Thus, it is possible to prevent or considerably reduce wave reflection and uncontrolled wave propagation caused thereby in a cheap and effective ...

Embedded sound box

Patent Number: 8107666
Publication Date: 2012-01-31
Inventors: Smith, III, Lowell Jack; Peng, Chih-Ming; Lee, Hou-Yung; Lee, Hui-Fen

The present invention discloses an embedded sound box including a box body and a front panel, and the box body has a fixing plate and at least one spring plate at an end and at least one slide wedge at another end. When the sound box is installed, an end of the fixing plate having the spring plate of the box body is latched into an opening hole, and a slide wedge is retracted towards the interior of the box body, and another end of the fixing plate corresponding to the box body is installed ...

Insert earphone using a moving coil driver

Patent Number: 8107665
Publication Date: 2012-01-31
Inventors: Haapapuro, Andrew J.; Drambarean, Viorel; Killion, Mead C.

Certain embodiments of the invention may be found in an insert earphone assembly. The insert earphone assembly may comprise a housing and a transducer located in the housing. The transducer may be for converting electrical signals received into sound energy. The insert earphone apparatus may further comprise an insert element. The insert element may be at, least partially integrated within the housing. The insert element may also comprise a main sound channel for communicating the sound ...

Cap with bluetooth headset

Patent Number: 8107664
Publication Date: 2012-01-31
Inventor: Mao, Yongzhong

The invention discloses a cap with a bluetooth headset which is in the technology field of daily supplies, including a cap body. The cap body has a bluetooth headset which comprises a transceiver and two acoustic generators on the right and left respectively, the transceiver is set at either position of the cap body, each of the acoustic generators are respectively set at a side of the cap body corresponding to the ears. A piece of lead is used to connect the transceiver and acoustic ...

Headset

Patent Number: 8107663
Publication Date: 2012-01-31
Inventor: Lin, You-Ruei

A headset has a hollow housing having a front wall with at least one sound hole formed thereon, and a rear wall facing the front wall having a plurality of air holes formed thereon. A loudspeaker unit is disposed in the housing and adjacent to the sound hole. An adjustive component is rotatably mounted to the rear wall of the housing. The adjustive component has an adjustive switch outside the rear wall and a blocking slice against an inner surface of the rear wall and connected with the ...

Porting

Patent Number: 8107662
Publication Date: 2012-01-31
Inventor: Parker, Robert Preston

A ported electroacoustical device uses the action of the port to provide cooling airflow across a heat producing device. The device includes a loudspeaker enclosure including a first acoustic port, and an acoustic driver, mounted in the loudspeaker enclosure. The device also includes a heat producing device. The acoustic driver and the acoustic port are constructed and arranged to coact to provide a cooling, substantially unidirectional airflow across the heat producing device, thereby ...