Communications device and methods of using the same

Abstract

A multimodal communications device is presented that includes a first audio input receiver, configured to receive a first audio signal from a first audio source. The communications device also includes a second audio input receiver, configured to receive a second audio signal from a second audio source. The communications device also includes a first audio output transmitter, configured to provide a first audio output to a first speaker. The communications device also includes a second audio output transmitter, configured to provide a second audio output to a second speaker. The communications device also includes a switch configured to, when actuated, change a mode of the communications device between a monaural and a binaural mode. In the monaural mode, the communications device is configured to generate the first audio output based on the first audio signal, herein the first audio output comprises substantially none of the second audio signal. In the binaural mode, the communications device is configured to generate the first audio output based on a mix of both the first and second audio signals.

Description

[0001] COMMUNICATIONS DEVICE AND METHODS OF USING THE SAME TECHNICAL FIELD Certain embodiments relate to the audio communications systems. More specifically, certain embodiments relate to a multi-audio input, stereo audio output, push-to-talk (PTT) switch device. SUMMARY A multimodal communications device is presented that includes a first audio input receiver, configured to receive a first audio signal from a first audio source. The communications device also includes a second audio input receiver, configured to receive a second audio signal from a second audio source. The communications device also includes a first audio output transmitter, configured to provide a first audio output to a first speaker. The communications device also includes a second audio output transmitter, configured to provide a second audio output to a second speaker. The communications device also includes a switch configured to, when actuated, change a mode of the communications device between a monaural mode and a binaural mode. In the monaural mode, the communications device is configured to generate the first audio output based on the first audio signal. herein the first audio output comprises substantially none of the second audio signal. In the binaural mode, the communications device is configured to generate the first audio output based on a mix of both the first and second audio signals. In some embodiments, the method involves changing the operating mode of a communications device by initially operating it in a first mode. A switch located proximate or on the device is then actuated, allowing the device to operate in a second mode. These modes are distinct and can be either a monaural mode, where a first speaker broadcasts an audio output signal based on a first audio input, excluding any second audio input, or a binaural mode, where the first speaker broadcasts a mixed audio output signal derived from both the first and second audio inputs. The method may involve providing a push-to-talk (PTT) device that is communicatively coupled to at least one radio, featuring both a first audio input and a second audio input. Initially, the PTT device can operate in a monaural mode, where a first audio output is generated at a first speaker from the first audio input, and a second audio output is generated at a second speaker from the second audio input. By actuating a switch located on the PTT device, the device may transition to a binaural mode. In this mode, the first and second audio inputs are mixed to form a combined audio output, which is directed to both the first and second speakers. The monaural and binaural modes represent distinct operating configurations of the PTT device. The push-to-talk (PTT) device may include a first audio input line configured to receive a first source and a second audio input line configured to receive a second source. It might feature a first signal path with a first capacitor in series with a first resistor, terminating at a first summation node, and a second signal path with a second capacitor in series with a second resistor, terminating at a second summation node. A switch could be configured to selectively alter the circuit connection between the first and second summation nodes. The device may have a first audio output coupled to the first summation node and a second audio output coupled to the second summation node. In a first operating mode, the first source might be provided to the first audio output and the second source to the second audio output. In a second operating mode, the switch may cooperate to merge the first and second sources so that both audio outputs present a combined audio signal. The details of one or more examples of the disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the disclosure will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an example embodiment of a communications device in accordance with embodiments herein. FIG.2 illustrates a schematic for a monaural communications device. FIG. 3 illustrates an example schematic for a multi-modal communications device in accordance with embodiments herein. FIG. 4 illustrates an example method of operating a multi-modal communications device in accordance with embodiments herein. FIG. 5 is a diagram illustrating a system that includes a sound-attenuating headset operably connected to a communications device, in accordance with embodiments described herein. FIG. 6 is a flowchart illustrating an example method for operating a push-to-talk device in monaural and binaural modes, in accordance with embodiments disclosed herein. Repeated use of reference characters in the specification and drawings is intended to represent the same or analogous features or elements of the disclosure. It should be understood that numerous other modifications and embodiments can be devised by those skilled in the art, which fall within the scope and spirit of the principles of the disclosure. The figures may not be drawn to scale.

[0002] DETAILED DESCRIPTION As used herein, an element or step recited in the singular and proceeded with the word “a” or “an” should be understood as not excluding plural of said elements or steps, unless such exclusion is explicitly stated. Furthermore, references to “an embodiment,” “one embodiment,” “a representative embodiment,” “an exemplary embodiment,” “various embodiments,” “certain embodiments,” and the like are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Moreover, unless explicitly stated to the contrary, embodiments “comprising,” “including,” or “having” an element or a plurality of elements having a particular property may include additional elements not having that property. Furthermore, the term controller, processor, or processing unit, as used herein, refers to any type of processing unit that can carry out the required calculations needed for the disclosure, such as single or multi-core: CPU, DSP, FPGA, ASIC or a combination thereof. In many environments, a user may receive information from a number of different sources simultaneously. In noisy environments, it is important that a user receive information in such a way that it is understandable. Embodiments herein are drawn to dual communication radio systems. A typical dual communication radio system will present Radio A communication to one speaker– e.g. to a left earmuff / earbud, and Radio B to the other speaker, e.g. to a right earmuff / earbud. This method allows the user to quickly identify which radio the transmission is originating from. However, only presenting a stream of information to a single speaker can reduce speech intelligibility and quality. If a user is in a stressful situation, or in a place with high ambient noise, the difficulty in hearing and understanding speech increases. Some options have been tried to increase speech understanding. For example, the 3M™ Peltor™ SCU-300 provides a user with three radio configuration options. A user can have sound broadcast as a mix – e.g. sound from each radio is heard equally in both ears. A user could also choose to have sound broadcast in surround sound – e.g. sound from the different radios is broadcast so that it is perceived as coming from different locations – e.g. a first radio coming from a user’s “10 o’clock” and a second radio coming from a user’s “12 o’clock.” The user may also, as noted, have a monaural broadcast of sound to each speaker of a headset or pair of earbuds, such that sound from each radio is broadcast to a separate speaker – e.g. radio A to a user’s left ear and radio B to a user’s right ear. A user’s needs regarding sound broadcast may change rapidly as their situation changes. For example, a user may need to switch quickly from sound being broadcast in a monaural mode, e.g. each radio input broadcast to a designated speaker, to sound being broadcast in a binaural mode, e.g. sound from both radios being broadcast in both ears. This may allow a user to experience a sound mix in a louder ambient environment but have a monaural experience in a quieter ambient environment. The ability to switch back and forth easily may be particularly important. For a soldier on a battlefield, for example, the ambient noise level may change significantly and rapidly. While some existing devices may allow for a user to change a broadcast configuration using a user interface, it may not be possible, or safe, for a user to take the time and attention to navigate through a menu of options. Presented herein are embodiments where a user can mechanically switch a broadcast mode and receive tactile and / or audible feedback indicative of the change. Aspect of the present disclosure can address this technical challenge by enabling a quick switch from monaural operation, in which each source is kept separate, to a binaural mode that mixes the signals into both ears. This capability enhances speech clarity by taking advantage of binaural listening effects, while preserving the user’s ability to differentiate audio channels as needed. In some embodiments, the simple, power‐efficient switching mechanism and optional fail‐safe design further ensure that communication quality is maintained even if an external power loss or other disruptive condition occurs. In some embodiments, a user actuates a mechanical switch – which may include a toggle, a button, a dial, a slider or other suitable mechanism. The mechanical switch may change configurations, from a first configuration to a second configuration. In some embodiments, changing configurations includes changing a physical position, in an X or Y axis, of the switching mechanisms, e.g. a slider moving from a first position to a second position. The mechanical switch, in some embodiments, may change a configuration, e.g. rotation of a dial or a toggle about a fixed point. The mechanical switch may also change configurations by adjusting Z-axis position, e.g. a button switching from a depressed to un-depressed configuration, etc. The electro-mechanical switch may be implemented electronically in any suitable manner. For example, activating the switch may close or open an electrical circuit, or switch a flip-flop circuit. In some embodiments, the switch mechanism is an electronic switch, which is triggered by actuation of a mechanism. In some embodiments herein, the switching mechanism does not require a power source or active circuitry. This may be important as communication devices and systems are often battery- powered. A power-free mechanical switch increases user functionality without significantly impacting the battery life of a unit. FIG. 1 illustrates an example embodiment of a communications device in accordance with embodiments herein. FIG.1 illustrates a communications device 100. In the illustrated embodiment, communications device 100 is a push-to-talk device (PTT device). PTT device 100 is configured to receive audio from another device, such as a radio, for example, and provide the audio to a speaker, for example an earbud or earmuff of a hearing protection device. However, it is expressly contemplated that functionality described herein may also be implemented in other communications devices, such as a part of a hearing protection device, a radio, a system control unit, etc. PTT device 100, in some embodiments herein, servers as a junction connecting multiple radios to a single user’s communication headset or earbuds. Corresponding PTT switch buttons 106A, B on the PTT switch device 100 independently activate transmit function for each of a Radio A and a Radio B (not shown in FIG.1) and allow the user to transmit audio from a connected microphone (not shown) through any of the connected radios. In tactical situations, users are often carrying multiple radios that allow them to engage in conversations with multiple groups or with other users operating on different radio frequencies. In these situations, users connect a single microphone to a multi-input PTT switch device 100 that is connected to one or more radios. The multiple-input PTT switch device 100 may include multiple electrical PTT switch buttons 106 that close a corresponding PTT switch to activate the transmit feature of the corresponding connected radios as well as an audio processing unit that receives one or multiple digital audio inputs and produces two processed digital audio outputs with unique processing for each of the left and right ear. PTT device 100 includes two audio inputs 102, which couple to Radio A and Radio B. Audio inputs 102 may be configured to connect to Radios A and B using any suitable wired or wireless connection protocol. Audio may be output to a headset or earbuds using an audio output 104, which may be connected to PTT device 100 using a wired or wireless connection. In some implementations, the audio output 104 includes a receptacle or jack capable of providing separate outputs to multiple audio channels. For example, the receptacle may be configured to accommodate a stereo plug that carries both left and right audio signals. In such a configuration, each channel is separately driven within the device so that a user wearing dual-ear headphones or earbuds can receive distinct audio streams in each ear. Although a single receptacle 104 is illustrated in FIG.1, internally it can incorporate two or more separate lines for left and right outputs (and optionally a microphone return), thereby ensuring compatibility with standard stereo headsets. The physical structure of 104 can be any standard or proprietary form factor (e.g., 3.5 mm, 6-pin LEMO, or other suitable connectors) that provides a secure and reliable audio connection. While audio inputs 102 are described as radios, it is expressly contemplated that incoming audio streams may come from any number of suitable sources, including, but not limited to, a telephone, a land mobile radio (LMR), a public broadcast channel (television or radio), radio, Internet, a synthesized audio source, an alert tone from an alert generation device, etc. A switching mechanism 110 is accessible for a user on an exterior surface of device 100, such that a user can locate mechanism 110 using tactile feedback. This may be important in scenarios where a user’s visual focus must be elsewhere for safety or other reasons. Illustrated in FIG.1 is a toggle 110 that is configured to move from a first position 112 to a second position 114. In FIG. 1, toggle 110 rotates about a pivot point as indicated by arrow 116. However, it is expressly contemplated that, while a toggle is illustrated in FIG. 1, that other switching mechanisms are possible. A tactile switching mechanism may include, for example, a switch, a toggle, a slider, a depressable button, or another suitable mechanism. In some embodiments, switching mechanism 110 may also provide audible feedback – e.g. a click, a snap, or another sound generated by the mechanics of the switching mechanism 110 (e.g. metal contacting metal, a spring being engaged, etc.) In the illustrated embodiment of FIG.1, the switching mechanism 110 is mounted to an exterior portion of the PTT device housing 111 through a suitably sized opening. A retaining nut or internal bracket may be used to secure the switch mechanism 110 in place, ensuring that it protrudes from the device housing 111 so it can be easily accessed by a user. In some embodiments, an O-ring or gasket can be placed between the switch 110 and the housing 111 to provide adequate sealing against moisture and contaminants. The switch 110 is thus both robustly attached for stable operation and positioned for convenient tactile engagement, allowing the user to readily toggle between monaural and binaural modes without compromising the environmental integrity of the device. In some embodiments, rather than employing the toggle switch 110, the communications device 100 incorporates an electrical push-button switch—such as a momentary push-to-talk (PTT) button— that the user depresses to toggle between monaural and binaural modes. When the button is pressed, it can trigger a flip-flop or similar electronic circuit within the device 100, causing the audio outputs to switch from segregated left / right channels to mixed audio in both earpieces (or vice versa). This arrangement allows for rapid, on-demand switching. Additionally, the button may provide tactile and / or audible feedback (e.g., a soft “click”) to assure the user that the sound mode has successfully changed. PTT device 100 may include other functional components or programming not shown in FIG. 1, for example one or more analog-to-digital converters (ADCs), digital-to-analog converters (DACs), one or more audio processing units, microphone input, etc. The ADCs may include any suitable logic, circuitry, interfaces and / or code that may be operable to convert an incoming analog audio streams from the one or more audio sources to corresponding digital audio streams, which are provided to the audio processing unit. The ADCs may disposed between the audio input connectors and the audio processing unit. Notwithstanding, the embodiments are not limited in this regard. Accordingly, in some embodiments, the ADCs may be integrated within the audio input connectors and / or the audio processing unit. The audio processing unit may comprise suitable logic, circuitry, interfaces and / or code that may be operable to process the received digital audio streams to spatially position each of a plurality of unique incoming audio streams. FIG.2 illustrates a schematic for a monaural communications device. FIG.2 illustrates a typical communications device which provides a single audio stream to a single speaker, without an option to mix the two audio streams together. A communications device 200 receives audio input from each of two sources – 202 and 212. FIG. 2 illustrates an embodiment where device 200 is a PTT and audio is incoming from two different radios 202, 212. However, it is expressly contemplated that communications device 200 may be any suitable communications device – such as a headset, a pair of earbuds, a system control unit, etc. It is also expressly contemplated that audio sources 202, 212 may be any suitable source of audio. Communications device 200 includes processing circuitry and / or components that produces two audio output streams, with audio from source 202 provided, as audio stream 204, to a speaker 206, which may be associated with, for example, a user’s left or right ear. Similarly, processing circuitry produces an output stream 214, which is provided to a speaker 216, based on incoming audio stream 212. FIG. 3 illustrates an example schematic for a multi-modal communications device in accordance with embodiments herein. Audio is received by a device 300 from two audio sources, 302 and 312. In some embodiments, device 300 can be an abstracted schematic of device 100 of FIG.1. In the example of FIG.3, the first audio input line 303 and the second audio input line 305 are each configured to receive an audio signal from corresponding audio sources 302 and 312, respectively. Although radios are shown by way of example, any suitable audio transmitter may be connected to these lines. Physically, these audio input lines can be implemented as jacks or receptacles on device 300, allowing a user to plug in standard or specialized connectors. Once plugged in, the signals from sources 302 and 312 are conducted through signal paths 304 and 314 (which can include capacitors C1, C2, and resistors R1, R2) for any necessary mixing or processing within device 300. Afterward, the processed signals are routed to the audio outputs 311 and 313, which can in turn be coupled to separate a headset 333 or earpieces (e.g., first speaker 306 and second speaker 316), enabling the user to hear the received audio. In some implementations, the components of device 300 are mounted on a printed circuit board (PCB) enclosed within a push-to-talk (PTT) housing. This PCB may include the switch 320 for selecting between operational modes, the bridging resistor R3 that creates a signal blend in binaural configurations, and any additional components, such as capacitors C1 and C2, resistors R1 and R2, and optional amplifiers 317 and 319. By placing these elements on a PCB, device 300 can be assembled and tested for consistent performance and reliability, while also allowing for compact form factors suitable for field operations. Furthermore, a PCB-based architecture helps facilitate design updates or component replacements—whether to adjust mixing ratios (through resistor value changes) or add new functionalities (e.g., flip-flop circuits or preamp stages). In the first operational mode (monaural), the device functions in a manner analogous to the configuration shown in FIG. 2, where each audio input is routed to a dedicated output without substantial mixing. In this mode, switch 320 resides in a position that effectively “opens” bridging resistor R3, so the first audio signal from audio source 302 (via first audio input line 303 and signal path 304) remains isolated and is delivered substantially only to the first audio output 311. Simultaneously, the second audio signal from audio source 312 (via second audio input line 305 and signal path 314) is directed to the second audio output 313. As a result, the user perceives each source on a separate channel—one in the left ear and the other in the right ear (if connected to a stereo headset)—closely paralleling the single-channel-per-ear arrangement illustrated in FIG.2. In the first operational mode (monaural), capacitor C1 and resistor R1 collectively function to process the incoming audio from the first source 302 before it reaches optional amplifier 317 and the summation node 307. Specifically, C1 blocks any unwanted DC component or offset that might be present in the signal, while R1 helps establish the proper impedance for the amplifier stage. With bridging resistor R3 effectively “open,” summation node 307 is used only to route the first audio signal toward audio output 311 (and ultimately on to the separate speaker) rather than mixing it with the second audio channel. If amplifier 317 is employed, it may further boost or condition the signal after it passes through R1, ultimately ensuring a clean, isolated audio feed for the monaural configuration. In some embodiments, the optional amplifier 317 is housed directly within the headphone or earpiece rather than in the core circuitry of device 300. Placing amplifier 317 inside the headphone enclosure can simplify the design of the main unit by allowing it to function as a passive mixing and routing device, while the headphone itself handles boosting the audio signal. Depending on implementation, amplifier 317 may draw power from an internal battery in the headphone, or from the device’s power source through dedicated lines. Integrating the amplifier in the headphone also facilitates features like individual volume control, active noise cancellation, or other audio processing functions, all while keeping the external unit (e.g., device 300) relatively compact and power-efficient. Summation node 307 can serve as a simple soldered junction between the first signal path 304 and any downstream components, or it can be a more sophisticated stage that includes preamplification circuitry. In a basic implementation, the node may merely join the output from resistor R1 (and capacitor C1, if used) to the bridging resistor R3 line, effectively combining signals at a single connection point. By contrast, in an enhanced design, summation node 307 may be integrated with a preamp that boosts or filters incoming audio before it is routed onward to either the switch 320 or the optional amplifier 317. This latter arrangement allows for finer control over signal levels, impedance matching, and other processing parameters, giving designers the flexibility to fine-tune the audio performance of the device. In some embodiments, the circuit connection 322 between the two summation nodes 307 and 309 includes the bridging resistor R3 in series, or otherwise electrically coupled, with the switch 320. When switch 320 is in a first position (open), the circuit path through R3 is effectively broken, preserving monaural operation. In a second position (closed), switch 320 places R3 between the two summation nodes, allowing the audio signals to intermingle and produce a binaural output. In other implementations, bridging resistor R3 can be replaced or supplemented by an alternative resistive network, such as a variable resistor or a set of switchable resistor values, enabling different levels of mixing. In yet another variation, the switching mechanism 320 a purely electronic switch (e.g., a transistor or flip-flop controller) may toggle the bridging resistor in and out of circuit, providing the same fundamental functionality in a more compact or automated manner. In some embodiments, the bridging resistor R3 may be implemented as a resistor network incorporating multiple resistor elements rather than a single discrete resistor. For example, one or more series, parallel, and / or combination resistor elements may be arranged between the first summation node and the second summation node, thereby providing more refined control of the mixing ratio and potentially shaping the frequency response of the combined signals. Such a network can be configured to attenuate specific frequency ranges differently, allowing certain audio components to be more or less pronounced in the binaural output, or to achieve a subtle imbalance that helps the user identify distinct sources. By varying the values or arrangement of the individual resistor elements, the network may be adapted to a wide range of operational scenarios or user preferences, while still fulfilling the core functionality of selectively merging the first and second audio signals. In some embodiments, the switch mechanism 320 may be any component or assembly operable to transition between two or more electrical states, thereby altering how the audio signals from various signal paths are routed or mixed. For example, switch 320 could be a mechanical toggle switch that may physically open or close a circuit, offering the user tactile feedback in high-intensity environments. In other implementations, the switch mechanism might be a momentary push-button coupled to electronic circuitry (such as a flip-flop) for toggling between modes with each press. Still other embodiments may employ a rotary dial, slider, or even a touch-sensitive interface, so long as it reliably changes the relevant circuit connections. In each case, the fundamental operation involves selectively activating or deactivating the bridging resistor R3 path, allowing the device to switch between monaural and binaural configurations or other desired signal-routing variations. In some implementations, when the switch mechanism 320 is actuated to enter a second operating mode (e.g., binaural mode), it may close an electrical path that includes bridging resistor R3. In doing so, the audio signal passing along the first signal path and the audio signal on the second signal path become intermixed at a summation node. This partial or complete summation of the two incoming audio signals results in both signals being present at each channel output, thereby providing the user with a binaural listening experience. Depending on design requirements, the resistance value of R3 may be chosen to set a particular volume ratio between the two signals, enabling balanced or attenuated levels of each audio source in the second mode. In some examples, a designer may select a bridging resistor R3 with a value anywhere from approximately 4 ohms to 10 kiloohms, depending on the desired mixing ratio. For instance, if R3 is approximately equal in magnitude to the resistors in the first and second signal paths (e.g., R1 or R2), the user might hear each audio source with roughly equal volume in the second mode. Conversely, a significantly higher R3 value—such as on the order of 100 times R1 or R2—can yield a more subtle blend of the secondary audio signal in one or both channels. By choosing these resistances strategically, device designers can control how strongly the two audio signals are merged, thus tailoring the user’s listening experience for a variety of operational scenarios. In certain embodiments, the bridging resistor R3 is chosen such that the ratio R3:R1 is no more than about 100:1. In further variations, this ratio may be no more than about 90:1, 80:1, 50:1, or even 20:1, depending on the degree of audio mixing or level imbalance desired between the two signal paths. By establishing these upper limits, designers can control how much the second signal attenuates (or merges with) the first signal when in the binaural mode. In some cases, R3 may even be set to zero ohms to create a direct blend between the two channels, resulting in nearly uniform mixing of the audio sources. In certain embodiments, the combined value of resistors R1 and R2 effectively establishes the input impedance seen by amplifiers 317 and 319, which may be located in or associated with the headphone or earpiece assembly. By setting the sum of these resistor values, system designers can manage how the incoming audio signals are presented to each amplifier, helping to control signal levels and avoid distortion or clipping. This arrangement also supports optimal amplifier operation by maintaining stable loading conditions, which can deliver clear, balanced audio to the user. Moreover, in a binaural configuration, interaction between R1, R2, and the bridging resistor R3 may be leveraged to preserve consistent performance across different mixing modes, ensuring reliable and intelligible audio. In certain embodiments, bridging resistor R3 may create an intentional imbalance in the volumes of the two audio signals once they are mixed, thereby producing an acoustic level difference between the left and right ears. This level difference can help a user identify which radio source is active at any given time. For instance, one signal may be attenuated by at least 6^dB relative to the other, yielding a distinct auditory cue. In some configurations, the resulting mix ratio is based on the relationship of R3 to R1 or R3 to R2, enabling fine-tuning of the perceived volume offset in the binaural mode. FIG. 4 illustrates an example method of operating a multimodal communications device in accordance with embodiments herein. At block 410, a communication device operates in a first operating mode. For example, a user may normally operate a communication device in a monaural mode 412, such that audio streams are delivered to each of their right and left ears without any substantial mixing. However, it is expressly contemplated that a first operating mode could be a binaural operating mode. At block 420, a switch is activated. In some embodiments, the switch is a physical mechanism located on an exterior of the communication device. The switching mechanism may include any suitable mechanism – a toggle, a button, a switch, a slide, etc. In some embodiments, actuating a switch provides tactile feedback for a user. In some embodiments, actuating a switch provides audible feedback for a user. At block 430, the communications device operates in a different communication mode from that of block 410. For example, a communication device operating in a monaural mode 412, once switched, may operate in a binaural mode 422. Similarly, a communication device operating in a binaural mode 414 may, when switched, operate in a monaural mode 424. In some embodiments, in a binaural mode, audio from two incoming streams is evenly mixed. In some embodiments, in a binaural mode, audio from two incoming streams is unevenly mixed, which may provide a user with an indication of which audio comes from which audio source. For example, a left ear may receive an audio signal with signal A at a first volume, and signal B at a volume 6 dB below the first. Fig. 5 illustrates a system 500 comprising a headset 333 is shown plugged into the communications device 100. In some implementations, the headset 333 incorporates sound-attenuating features in accordance with standards such as EN^352-1, potentially providing at least about 12^dB of noise reduction. The headset 333 may include one or more internal amplifiers (not pictured), which drive the earcup speakers (e.g., speakers 306 and 316) to deliver audio from device 100. FIG.6 illustrates a representative flow diagram of a method for operating a multi‐modal push‐to‐talk (PTT) device that can be switched between monaural and binaural modes. At block 602, the method begins by providing a push-to-talk (PTT) device that is communicatively coupled to at least one radio. In this context, “providing” may encompass setting up or making available the PTT device with its requisite audio inputs, outputs, and circuitry so that it can interface with external communication equipment. By way of example, the PTT device could include jacks or connectors for two separate radio inputs, as well as output lines or ports for connection to a user’s headphones or earpieces. This initial step can ensure that the PTT device is suitably configured to operate in the subsequent monaural or binaural modes as described below, facilitating integration with various communication sources. At block 604, the user operates the PTT device in a monaural mode. In this mode, each audio input is routed individually to a corresponding audio output; for instance, the first audio input is directed to a first speaker, while the second audio input is directed only to a second speaker. By maintaining these signals as separate streams, the user can readily distinguish between different incoming channels (e.g., communications from Radio A in one ear and Radio B in the other), which can be important in situations where quick identification of the transmitting source is essential. During monaural operation, minimal or no signal mixing occurs, and each channel may be processed independently (for example, it may pass through its own amplifier or filtering path). This setup can be particularly useful if only one radio is active at a time, or if the user prefers the clarity and directional cues that separate streams can provide. In addition, certain users—such as those operating in noisy environments—may choose monaural mode if they find localization of multiple channels in separate ears more comfortable or intuitive for mission-critical tasks. At block 606, the user actuates a switch located on the PTT device to transition out of monaural mode. In some embodiments, this switch is a simple mechanical toggle that can be flipped or slid into a new position, physically reconfiguring the internal circuitry. In other embodiments, a momentary push button may be employed in conjunction with electronic switching (such as a flip‐flop circuit) so that a single press toggles the device between different output modes. In either case, this quick actuation enables seamless, on‐the‐fly adjustments, accommodating changing operational requirements without pausing or shutting down communications. The switch actuation may provide immediate tactile or audible feedback—such as a click, snap, or LED indicator—so the user knows the configuration has changed. This feedback can be particularly valuable in high‐noise or stressful environments, ensuring that the transition from monaural to binaural does not require the operator’s full visual attention. By designing the switch to be highly accessible and straightforward to engage, the PTT device allows for rapid mode changes that can significantly enhance the user’s ability to perceive and manage multiple audio channels. In some embodiments, the communications device is configured with a fail‐safe feature that ensures audio pass‐through continues even if power to the device is lost or insufficiently supplied. In such configurations, the internal switching or mixing circuitry is arranged so that the user can still receive audio from the connected sources in at least one mode—typically monaural—without relying on battery power or external power inputs. This fail‐safe design helps maintain essential communication in emergency scenarios, allowing the device to default to a direct audio / electrical path rather than becoming non‐functional should an unexpected power loss occur. At block 608, the PTT device is operated in a binaural mode, wherein the first and second audio inputs are mixed to form a combined output delivered to both the first and second speakers. In this configuration, portions of each signal become present in both ears, which may improve speech intelligibility and overall situational awareness—particularly in noisy or fast-paced settings. Depending on the specific design, the mixing balance can be carefully tuned, for example by using a bridging resistor or active circuitry, such that one input is slightly louder in one ear than the other, thereby preserving some locational cues for source identification. List of Illustrative Embodiments: Embodiment 1: A multimodal communications device comprising: a first audio input receiver, configured to receive a first audio signal from a first audio source; a second audio input receiver, configured to receive a second audio signal from a second audio source; a first audio output transmitter, configured to provide a first audio output to a first speaker; a second audio output transmitter, configured to provide a second audio output to a second speaker; a switch configured to, when actuated, change a mode of the communications device between a monaural mode and a binaural mode, wherein: in monaural mode, the communications device is configured to generate the first audio output based on the first audio signal, wherein the first audio output comprises substantially none of the second audio signal; and in the binaural mode, the communications device is configured to generate the first audio output based on a mix of both the first and second audio signals. Embodiment 2: The communications device of Embodiment 1, wherein the switch comprises a mechanical switch. Embodiment 3: The communications device of any of the preceding embodiments, wherein the switch comprises an electrical switch. Embodiment 4: The communications device of Embodiment 3, wherein the electrical switch comprises a flip flop switch. Embodiment 5: The communications device of any of the preceding embodiments, wherein, if only a first audio input signal is detected, the communications device operates in the binaural mode. Embodiment 6: The communications device of any of the preceding embodiments, wherein the mix is an even mix, such that a broadcast volume of the first and second audio signals are similar. Embodiment 7: The communications device of Embodiment 2, wherein the mechanical switch uses substantially no power to switch the mode of the communications device. Embodiment 8: The communications device of Embodiment 2, wherein the mechanical switch is located on an exterior of the communications device. Embodiment 9: The communications device of any of the preceding embodiments, wherein the communications device is configured to process the first audio signal, and wherein the first audio output comprises a processed version of the first audio signal. Embodiment 10: A method of changing an operating mode of a communications device, wherein the method comprises: operating the communications device in a first operating mode; actuating a switch located proximate the communications device; operating the communications device in a second operating mode; and wherein the first and second operating modes are different and selected from: a monaural mode comprising a first speaker broadcasting a first audio output signal, wherein the first audio output signal is based on a first audio input, and not based on a second audio input; and a binaural mode comprising the first speaker broadcasting a mixed audio output signal, wherein the mixed audio output is based on both of the first and second audio inputs. Embodiment 11: A method comprising: providing a push-to-talk (PTT) device communicatively coupled to at least one radio, the PTT device including a first audio input and a second audio input; operating the PTT device in a monaural mode, the monaural mode including generating a first audio output at a first speaker from the first audio input and generating a second audio output at a second speaker from the second audio input; actuating a switch located on the PTT device; and operating the PTT device in a binaural mode in response to actuating the switch, the binaural mode including mixing the first audio input and the second audio input to form a combined audio output directed to both the first speaker and the second speaker, wherein the monaural mode and the binaural mode are distinct operating modes of the PTT device. Embodiment 12: The method of Embodiment 11, wherein the first audio input corresponds to a first channel of the at least one radio, and the second audio input corresponds to a second channel of the at least one radio. Embodiment 13: The method of any of the preceding embodiments, further comprising including a resistor network or bridging resistor within the PTT device configured to adjust an amplitude ratio between the first audio input and the second audio input in the binaural mode. Embodiment 14: The method of any of the preceding embodiments, further comprising providing one or more imbalance resistors in the PTT device to modify a perceived volume level of at least one of the first audio input or the second audio input during the binaural mode. Embodiment 15: The method of any of the preceding embodiments, further comprising incorporating at least one amplifier in the PTT device, the at least one amplifier configured to process the first audio input or the second audio input prior to being combined in the binaural mode. Embodiment 16: The method of any of the preceding embodiments, further comprising using a momentary button on the PTT device, wherein a flip-flop circuit toggles the PTT device between the monaural mode and the binaural mode in response to actuation of the momentary button. Embodiment 17: The method of any of the preceding embodiments, wherein the first speaker and the second speaker are part of a headset worn by a user. Embodiment 18: The method of Embodiment 17, wherein the headset provides hearing protection for the user in environments with elevated noise levels. Embodiment 19: The method of any of the preceding embodiments, further comprising passing the first audio input and the second audio input through at least one capacitor to block direct current while allowing audio frequencies to pass into the first speaker and the second speaker. Embodiment 20: The method of any of the preceding embodiments, wherein the switch is physically located on an exterior surface of the PTT device, enabling a user to toggle between the monaural mode and the binaural mode without navigating a menu. Embodiment 21: The method of any of the preceding embodiments, further comprising enabling a fail-safe configuration such that the first audio input and the second audio input remain audible at the first speaker and the second speaker under a power-loss condition in the PTT device. Embodiment 22: A push-to-talk (PTT) device, comprising: a first audio input line configured to receive a first source; a second audio input line configured to receive a second source; a first signal path comprising a first capacitor in series with a first resistor, the first signal path terminating at a first summation node; a second signal path comprising a second capacitor in series with a second resistor, the second signal path terminating at a second summation node; a switch configured to selectively alter a circuit connection between the first summation node and the second summation node; a first audio output coupled to the first summation node; and a second audio output coupled to the second summation node; wherein, in a first operating mode, the first source is provided to the first audio output and the second source is provided to the second audio output, and in a second operating mode, the switch cooperates to merge the first source and the second source so that the first audio output and the second audio output each present a combined audio signal. Embodiment 23: The device of Embodiment 22, further comprising a bridging resistor coupled between the first summation node and the second summation node on the circuit connection. Embodiment 24: The device of Embodiment 23, wherein the bridging resistor is configured to provide a user-selectable amplitude difference between the first channel and the second channel in the second operating mode. Embodiment 25: The device of Embodiment 23, wherein the bridging resistor has a resistance value in a range from approximately 4 ohms to approximately 10 kiloohms. Embodiment 26: The device of any of the preceding embodiments, wherein a ratio of the bridging resistor to the first resistor is between approximately 1:1 and 100:1. Embodiment 27: The device of any of the preceding embodiments, further comprising an amplifier disposed in at least one of the first signal path or the second signal path, the amplifier configured to adjust signal levels prior to activation of the switch. Embodiment 28: The device of any of the preceding embodiments, wherein the switch includes a momentary push button and a flip-flop circuit configured to toggle the device between the first operating mode and the second operating mode. Embodiment 29: The device of any of the preceding embodiments, wherein the first capacitor and the second capacitor are each configured to block direct current while allowing audio frequencies associated with the first channel and the second channel to pass. Embodiment 30: The device of any of the preceding embodiments, further comprising a housing that encloses the bridging resistor, the first resistor, and the second resistor to provide environmental protection. Embodiment 31: The device of any of the preceding embodiments, wherein the first audio output and the second audio output communicatively couple to a first and second speaker that are part of a headset that includes hearing protection features. Embodiment 32: The device of any of the preceding embodiments, further comprising a printed circuit board supporting the bridging resistor, the first resistor, and the second resistor, wherein the switch is mounted on the printed circuit board for direct electrical connection. Embodiment 33: The device of any of the preceding embodiments, wherein the switch is positioned on a portion of the housing for immediate access and mode selection. Embodiment 34: The device of any of the preceding embodiments, further comprising a non- transitory computer-readable medium storing design data representative of the first audio input line, the second audio input line, the first signal path, the second signal path, the switch, and the first and second audio outputs, such that the device is configurable according to the stored circuit design data.

Claims

CLAIMS What is claimed is:

1. A method comprising: providing a push-to-talk (PTT) device communicatively coupled to at least one radio, the PTT device including a first audio input and a second audio input; operating the PTT device in a monaural mode, the monaural mode including generating a first audio output at a first speaker from the first audio input and generating a second audio output at a second speaker from the second audio input; actuating a switch located on the PTT device; and operating the PTT device in a binaural mode in response to actuating the switch, the binaural mode including mixing the first audio input and the second audio input to form a combined audio output directed to both the first speaker and the second speaker, wherein the monaural mode and the binaural mode are distinct operating modes of the PTT device.

2. The method of claim 1, wherein the first audio input corresponds to a first channel of the at least one radio, and the second audio input corresponds to a second channel of the at least one radio.

3. The method of any of the preceding claims, further comprising including a resistor network within the PTT device configured to adjust an amplitude ratio between the first audio input and the second audio input in the binaural mode.

4. The method of any of the preceding claims, further comprising providing one or more imbalance resistors in the PTT device to modify a perceived volume level of at least one of the first audio input or the second audio input during the binaural mode.

5. The method of any of the preceding claims, further comprising incorporating at least one amplifier in the PTT device, the at least one amplifier configured to process the first audio input or the second audio input prior to being combined in the binaural mode.

6. The method of any of the preceding claims, further comprising using a momentary button on the PTT device, wherein a flip-flop circuit toggles the PTT device between the monaural mode and the binaural mode in response to actuation of the momentary button.

7. The method of any of the preceding claims, wherein the first speaker and the second speaker are part of a headset worn by a user.

8. The method of any of the preceding claims, further comprising passing the first audio input and the second audio input through at least one capacitor to block direct current while allowing audio frequencies to pass into the first speaker and the second speaker.

9. The method of any of the preceding claims, further comprising enabling a fail-safe configuration such that the first audio input and the second audio input remain audible at the first speaker and the second speaker under a power-loss condition in the PTT device.

10. A push‐to‐talk (PTT) device, comprising: a first audio input line configured to receive a first source; a second audio input line configured to receive a second source; a first signal path comprising a first capacitor in series with a first resistor, the first signal path terminating at a first summation node; a second signal path comprising a second capacitor in series with a second resistor, the second signal path terminating at a second summation node; a switch configured to selectively alter a circuit connection between the first summation node and the second summation node; a first audio output coupled to the first summation node; and a second audio output coupled to the second summation node; wherein, in a first operating mode, the first source is provided to the first audio output and the second source is provided to the second audio output, and in a second operating mode, the switch cooperate to merge the first source and the second source such that the first audio output and the second audio output each present a combined audio signal.

11. The device of claim 10, further comprising a bridging resistor coupled between the first summation node and the second summation node on the circuit connection.

12. The device of claim 11, wherein the bridging resistor is configured to provide a user- selectable amplitude difference between the first source and the second source in the second operating mode.

13. The device of claim 11 or 12, wherein the bridging resistor has a resistance value in a range from 4 ohms to 10 kiloohms.

14. The device of any of claims 11 to 13, wherein a ratio of the bridging resistor to the first resistor is between 1:1 and 100:

1.

15. The device of any of the preceding claims, further comprising an amplifier disposed in at least one of the first signal path or the second signal path, the amplifier configured to adjust signal levels prior to activation of the switch.

16. The device of any of the preceding claims, wherein the switch includes a momentary push button and a flip-flop circuit configured to toggle the device between the first operating mode and the second operating mode.

17. The device of any of the preceding claims, wherein the first capacitor and the second capacitor are each configured to block direct current while allowing audio frequencies associated with the first source and the second source to pass.

18. The device of any of the preceding claims, further comprising a housing that encloses the bridging resistor, the first resistor, and the second resistor to provide environmental protection.

19. The device of any of the preceding claims, wherein the first audio output and the second audio output communicatively couple to a first and second speaker that are part of a headset that includes hearing protection features.

20. The device of any of the preceding claims, further comprising a printed circuit board supporting the bridging resistor, the first resistor, and the second resistor, wherein the switch is mounted on the printed circuit board for direct electrical connection.

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