Consumers have had limited accessibility to high-resolution digital audio (audio files with greater than 48 kHz sample rate or higher than 16-bit audio bit depth). Lenbrook Industries Limited (owner of NAD Electronics and Bluesound Music Systems and the applicant of the present application) began development of a new type of high-resolution media audio playback system in 2004 and demonstrated such a system in 2009. By 2011, the NAD Masters Digital Suite Home Sound System enabled consumers to experience music via one or more networked playback devices. The system’s BluOS™ operating system was expanded to more affordable devices with the introduction of the Bluesound brand in 2012. Through a software control application installed on a controller (e.g., IR remote, wall mounted controller, smartphone, tablet, computer, voice input device), consumers can play what they desire in any room having a networked playback device. They can access high-resolution music files by each room with a playback device and group rooms together for synchronous playback of the same music. The BluOS™ modular software design also allows the unification of audio video receiver (AVR) devices, reducing the cost of software development compared to highly proprietary MCU/DSP software currently used throughout the AVR industry.
The present application relates generally to stereo headphones used for playback of high-resolution audio content from online music streaming services.
A wireless high-resolution headphones device is disclosed in accordance with one or more embodiments. The headphones device includes a first earpiece containing a first speaker and a second earpiece containing a second speaker. The device also includes a first wireless transceiver unit configured to operate at a first bandwidth to communicate with an external user device to receive control and/or configuration signals from the external user device. A second wireless transceiver unit in the device is configured to operate at a second bandwidth greater than the first bandwidth to communicate with a media source remote from the headphones device to receive high-resolution audio content from the media source. At least one processor in the device is configured to receive and process the high-resolution audio content received by the second wireless transceiver unit to generate audio output signals. The at least one processor is also configured to receive and process the control and/or configuration signals received by the second wireless transceiver unit to control operation of and configure the headphones device. One or more audio amplifiers in the device amplify the audio output signals to drive the first and second speakers to render an audio output. A rechargeable battery is also included for powering components of the headphones device.
In various embodiments, the first wireless transceiver unit is a short-range transceiver unit. In various embodiments, the first wireless transceiver unit is a Bluetooth transceiver unit. In various embodiments, the second wireless transceiver unit is a long-range transceiver unit. In various embodiments, the second wireless transceiver unit is a wireless cellular transceiver unit. In various embodiments, the wireless high-resolution headphones device includes a headband connecting the first and second ear pieces. In various embodiments, the media source communicates with the second wireless transceiver unit through a cellular connection having a transmission speed of at least 8 Mbps. In various embodiments, the media source communicates with the second wireless transceiver unit through a cellular connection having a transmission speed of 8-16 Mbps. In various embodiments, the at least one processor includes an ARM processor. In various embodiments, the wireless high-resolution headphones device includes a headband connecting the first earpiece and the second earpiece, and wherein the first wireless transceiver unit, the second wireless transceiver unit, the one or more audio amplifiers, and the at least one processor are mounted on a common circuit board in the first earpiece. In various embodiments, the rechargeable battery is mounted in the second earpiece. In various embodiments, the wireless high-resolution headphones device includes a flash memory and/or a random access memory readable by the at least one processor. In various embodiments, the external user device comprises a smartphone, a wearable device, a tablet computer, a laptop, or a desktop. In various embodiments, the wearable device is a smart watch. In various embodiments, the media source comprises a high resolution audio streaming server. In various embodiments, the high-resolution audio content comprises audio content sampled at a rate of at least 48 kHz. In various embodiments, the high-resolution audio content comprises audio content sampled at a rate of at least 96 kHz. In various embodiments, the second wireless transceiver unit has a standardized SDIO digital connection port for direct connection to a corresponding SDIO digital connection port on the at least one processor.
In accordance with one or more further embodiments, a method is disclosed for playing high-resolution audio on a wireless headphones device. The method includes (a) processing control and/or configuration signals received from an external user device at a first wireless transceiver unit in the headphones device to control operation of and configure the headphones device, said first wireless transceiver unit configured to operate at a first bandwidth; (b) processing high-resolution audio content received from an online media source at a second wireless transceiver unit to generate audio output signals, said second wireless transceiver unit configured to operate at a second bandwidth greater than the first bandwidth; and (c) amplifying the audio output signals to drive first and second speakers in the headphones device to render an audio output.
In various embodiments, the first wireless transceiver unit is a short-range transceiver unit. In various embodiments, the first wireless transceiver unit is a Bluetooth transceiver unit. In various embodiments, the second wireless transceiver unit is a long-range transceiver unit. In various embodiments, the second wireless transceiver unit is a wireless cellular transceiver unit. In various embodiments, the media source communicates with the second wireless transceiver unit through a cellular connection having a transmission speed of at least 8 Mbps. In various embodiments, the media source communicates with the second wireless transceiver unit through a cellular connection having a transmission speed of 8-16 Mbps. In various embodiments, the external user device comprises a smartphone, a wearable device, a tablet computer, a laptop, or a desktop. In various embodiments, the wearable device is a smart watch. In various embodiments, the online media source comprises a high resolution audio streaming server. In various embodiments, the high-resolution audio content comprises audio content sampled at a rate of at least 96 kHz.
In accordance with one or more embodiments, a wireless high-resolution headphones device is disclosed. The headphones device includes a first earpiece containing a first speaker and a second earpiece containing a second speaker. An ultra-wide band (UWB) wireless transceiver unit in the first earpiece or the second earpiece is configured to communicate with an external user device to receive high-resolution audio content and control and/or configuration signals from the external user device. At least one processor in the first earpiece or the second earpiece is configured to receive and process the high-resolution audio content received by the UWB wireless transceiver unit to generate audio output signals. The at least one processor is also configured to receive and process the control and/or configuration signals received by the UWB wireless transceiver unit to control operation of and configure the headphones device. The device also includes one or more audio amplifiers in the first earpiece or the second earpiece for amplifying the audio output signals to drive the first and second speakers to render an audio output. A rechargeable battery powers components of the headphones device.
In various embodiments, the external user device is a mobile phone or a computer.
Like or identical reference numbers are used to identify common or similar elements.
Various embodiments disclosed herein relate to cellular-enabled stereo headphones used for playback of high-resolution (Hi-Res) audio content from online media streaming services.
In various embodiments, headphones 10 may include at least one processor such as a digital signal processor. In various embodiments, the at least one processor may include an ARM processor.
In various embodiments, headphones 10 may include one or more batteries, such as a rechargeable Lithium Ion battery. In various embodiments, the one or more batteries may be mounted in either or both of the first and the second earpiece. In various embodiments, headphones 10 may include one or more components configured to receive and retain one or more disposable batteries, such as A, AA, AAA, C, D and/or 9V batteries. In various embodiments, headphones 10 may include one or more transceiver units. In various embodiments, a first wireless transceiver unit, that may be included in headphones 10, is a short-range transceiver unit. In various embodiments, the first wireless transceiver unit, that may be included in headphones 10, is a Bluetooth transceiver unit. In various embodiments, the second wireless transceiver unit, that may be included in headphones 10, is a long-range transceiver unit. In various embodiments, the second wireless transceiver unit, that may be included in headphones 10, is a wireless cellular transceiver unit. In various embodiments, headphones 10 may include a headband connecting the first and second ear pieces.
In various embodiments, the media source such as internet/music services 12 may communicate with the second wireless transceiver unit through a cellular connection having a minimum known transmission speed, such as a transmission speed of at least 8 Mbps. In various embodiments, the media source such as internet/music services 12 may communicate with the second wireless transceiver unit through a cellular connection having a range of known transmission speeds, such as transmission speeds of 8-16 Mbps.
In various embodiments, the wireless high-resolution headphones device, described herein, may include a headband connecting the first earpiece and the second earpiece. In various embodiments, the first wireless transceiver unit, the second wireless transceiver unit, the one or more audio amplifiers, and the at least one processor, as described herein, may be mounted on a common circuit board in the first earpiece. In various embodiments, portions or the entirety of the aforementioned components may be mounted on multiple separate and distinct circuit boards and communicatively and/or electrically connected. For example, a first portion of the components may be mounted on a first circuit board and a second portion of the components may be mounted on a second circuit board.
There may be fundamental limitations in the digital bandwidth available from the Bluetooth wireless connectivity standard. The digital bandwidth available for stereo audio transmission is approximately 1 to 2 Mbps. While this may be sufficient bandwidth for transmitting standard-definition stereo audio data that has been compressed with standard codec software (e.g., AAC, SBC, or aptX), this compression typically introduces acoustic artifacts that reduce the perceived audio quality presented by the headphones. Additionally, higher codec compression ratios may be needed for newer Hi-Res audio formats intended to provide audio quality beyond traditional standard-definition or ‘CD-quality’ audio. The higher codec compression ratios create even more acoustic artifacts, eliminating any advantage offered by the higher audio sample rates and bit depths of Hi-Res audio source formats. The impact of this fundamental bandwidth limitation has become well-known in the headphone industry, as consumers are preparing to purchase premium headphones to enjoy Hi-Res music being offered by popular music services such as Amazon™, Apple™, Tidal™, and Qobuz™. A need exists for an improved wireless digital connection between high-quality headphones and music sources.
The cellular connectivity module 32 may include specialized digital radio-frequency transceivers for connection to the cellular network. At its ‘baseband’ connection port, the cellular connectivity module 32 may include a standardized SDIO digital connection port for direct connection to a corresponding SDIO digital connection port on the ARM microprocessor 36. In one or more embodiments, the ARM microprocessor 36, RAM 40, and flash memory 38 may support boot and execution of an operating system, e.g., the BluOS™ operating system available from Lenbrook. BluOS™ includes software drivers for initializing the cellular connectivity module with user account information required to authenticate the headphone system with local cellular networks. BluOS™ also supports real-time Hi-Res audio decoder software components capable of decoding the latest Hi-Res audio formats offered by music streaming services such as MQA™, OraStream™, and Apple™. Although cellular wireless transceivers are associated with high power consumption requiring larger batteries not normally associated with headphones, recent silicon chipsets implementing 3G, 4G and 5G cellular standards have been designed to substantially reduce the power and thus size of battery needed to support mobile headphone applications. The Bluetooth transceiver 34 may also be hosted by BluOS™ software. This allows Bluetooth ‘pairing’ between the mobile phone 14 and the headphones 30 for a low-bandwidth connection enabling a control and configuration channel between the BluOS™ apps installed on the customer’s phone 14. Bluetooth may also be paired with other user devices including wearable devices such as smart watches to provide a convenient user control and configuration interface for the headphones 30.
In one or more embodiments, the headphones device 60 may include an integrated long-range connectivity module, such as wireless cellular transceiver 32, to provide a cellular connection 61 with a music service 12 on the Internet. In various embodiments, cellular connection 61 may include an LTE connection configured to transmit High Resolution (HiRes) audio content. A Bluetooth connection 63 may be used between a mobile phone 14, any external user device as described herein, or a combination thereof, or a personal computer 62 and the headphones device 60 to support control and configuration settings of the headphones device 60 from software apps installed on the mobile phone 14, any external user device as described herein, or personal computer 62. The headphones device 60 may include a long-range connectivity module, such as a wireless cellular connectivity module (e.g., a 3G, 4G, or 5G transceiver) 32, a short-range connectivity module (e.g., a Bluetooth transceiver) 34, a microprocessor (e.g., an ARM processor) 36, flash memory 38, RAM memory 40, and high-quality digital audio power amplifier 42 for driving speakers 44, 46. In one or more embodiments, these components may be mounted on a common circuit board that is located in the earpiece assembly (containing speaker 44) on one side of the headphones device 60. In various embodiments, flash memory 38 may be a NOR or NAND flash memory, such as an eMMC and/or SSD flash memory. In various embodiments, RAM memory 40 may be dynamic RAM, a static RAM, and/or a synchronous dynamic RAM memory.
In various embodiments, headphones device 60 may include a Power Management PMIC unit. In various embodiments, headphones device 60 may include one or more Adaptive Noise Cancellation device disposed therein. In various embodiments, the Adaptive Noise Cancellation device may include one or more microphones and speakers configured to analyze outside noise and produce sound to destructively interfere with said outside noise. In various embodiments, headphones device 60 may include one or more head-tracking accelerometers disposed therein. In various embodiments, the head-tracking accelerometers may be configured to detect and measure the position of the headphones device 60 relative or attached to a user’s head. In various embodiments, head-tracking accelerometers may provide said detection and/or measurements of head position to one or more other components to adjust at least one parameter of the audio playback or another aspect of the headphones device 60 operation based on the head position. In various embodiments, headphones device 60 may include one or more immersive audio processors. The immersive audio processors may spatially adjust the output of the earpiece speakers of headphones device 60. Immersive audio processors may be electrically and/or communicatively connected to each of the other components described herein.
In one or more further embodiments, the headphones device 60 can optionally also be connected to the mobile phone 14 or the personal computer 62 by a high-bandwidth wired analog stereo connection 64 to receive the high-resolution audio content. In various embodiments, headphones device 60 may include an opening or port configured to facilitate said wired analog stereo connection 64.
In one or more further embodiments, the headphones device 60 can optionally also be connected to the personal computer 62 by a high-bandwidth wired USB Audio Class 2.0 connection 68 to receive the high-resolution audio content.
In one or more further embodiments, the personal computer 62 may be connected to a USB dongle 66, which may be configured to wirelessly transmit the high-resolution audio content to the headphones device 60 using high-bandwidth ultra-wide band (UWB) connection 70. USB dongle 66 may include a USB audio class (UAC) Bridge and/or an Ultra Wide-Band (UWB) transceiver disposed therein. In various embodiments the USB audio class (UAC) Bridge and/or an Ultra Wide-Band (UWB) transceiver may be mounted on one or more circuit boards communicatively and/or electrically connected thereto. The audio content may be received at the headphones device 60 at an integrated UWB transceiver 72. UWB is a short-range wireless communication method which can operate at radiofrequencies higher than the 5 GHz spectrum reserved for WiFi. UWB’s radiofrequency modulation scheme periodically distributes the encoded digital information across the radiofrequency spectrum. UWB technology is advantageous in battery powered devices as it may consume substantially less energy than other short-range technologies such as Bluetooth, while it may support at least twice the data transmission bandwidth as Bluetooth.
In one or more further embodiments, the mobile phone 14 or computer 62 may include an integrated UWB module for wirelessly transmitting the high-resolution audio content to the headphones device 60 using a UWB connection.
In various embodiments, any component of headphones device 60, described herein, or combination of components may be disposed in either of the right or left earpieces. For example, and without limitation, the right earpiece may include a portion of the components and the left earpiece may include the remainder of the components. In various embodiments, the left and right earpieces may be configured to house a different type of component, for example and without limitation, the left earpiece may be configured to house each of the transceivers and memories, while the right earpiece may be configured to house each of the processors, accelerometers and battery/charging circuits. In various embodiments, as shown in
At step 610, method 600 includes processing high-resolution audio content received from an online media source at a second wireless transceiver unit to generate audio output signals, said second wireless transceiver unit configured to operate at a second bandwidth greater than the first bandwidth.
At step 615, method 600 includes amplifying the audio output signals to drive first and second speakers in the headphones device to render an audio output. Each of the method steps described herein may be performed simultaneously, in a different temporal order, and/or in any number of iterations or steps.
Having thus described several illustrative embodiments, it is to be appreciated that various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to form a part of this disclosure, and are intended to be within the spirit and scope of this disclosure. While some examples presented herein involve specific combinations of functions or structural elements, it should be understood that those functions and elements may be combined in other ways according to the present disclosure to accomplish the same or different objectives. In particular, acts, elements, and features discussed in connection with one embodiment are not intended to be excluded from similar or other roles in other embodiments. Additionally, elements and components described herein may be further divided into additional components or joined together to form fewer components for performing the same functions.
Accordingly, the foregoing description and attached drawings are by way of example only, and are not intended to be limiting.
This application claims the benefit of U.S. Provisional Application No. 63/325,892 filed Mar. 31, 2022, which is hereby incorporated by reference in its entirety.
Number | Date | Country | |
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63325892 | Mar 2022 | US |