Self-Contained Helmet Communication System

(Not Applicable)

(Not Applicable)

This invention relates to communication systems and, more particularly, to a self-contained helmet based communication system enabling conversation between a wearer and nearby unequipped persons.

The use of safety head gear in the form of protective helmets is common with individuals who engage in a number of activities including riding motorcycles, driving race cars, as well as athletics and other activities. In recent years helmets have been equipped with a variety of full-face shields or masks to provide additional protection to the face of a wearer. A problem associated with the use of helmets, particularly those with full-face shields, is the reduced ability of the wearer to orally communicate with one or more nearby persons. Indeed, some helmets make it nearly impossible for the wearer to communicate orally, especially in noisy environments.

Systems do exist which support communications between a helmet wearer and individuals located at remote stations. These types of systems, which require the helmet wearer and the remote individuals to be properly equipped, typically establish a radio-type communication channel between the helmet and the remote site. For example, wireless receiver/transmitter communication systems, used with protective helmets worn by race car drivers, are well known in the art. These types of systems enable a driver to communicate, on virtually a constant basis, with select members of the driver's pit and support groups. These systems require equipment to be placed at each end of the communications channel, so that each person is "equipped" by access to a microphone and a speaker or headphone connected to the receiver/transmitter equipment.

Systems of the kind discussed above, are of no help when a wearer of a helmet is attempting to orally communicate with a nearby "unequipped" person (not outfitted with any special communication devices or equipment). To orally communicate with such an unequipped person, a wearer would typically have to remove the helmet. In some cases, certain kinds of helmets, such as those including fire and heat shielding means, may be configured so that easy and quick removal is not possible. Further, removal may be hindered due to a confined space, such as within a race car.

Therefore, there is a need for a self-contained communication system that allows a helmet wearer to send sound waves to, and receive sound waves from an unequipped person near the wearer. Objects of the present invention are, therefore, to provide new and improved types of helmet communication systems having one or more of the following capabilities or features:

a fully self-contained system to support oral communication;

enable a wearer of a helmet to orally communicate with an unequipped person;

economical construction using available components;

all system components mounted to or within helmet;

powered by replaceable or rechargeable batteries;

solar recharging of batteries while helmet is worn.

In accordance with the invention, a self-contained helmet communication system is disclosed to send sound waves to and receive sound waves from a person near a helmet wearer. The helmet communication system is comprised of a helmet supportable on the head of the wearer, which may be a protective-type helmet to protect the head of the wearer. An external microphone device is mounted on the helmet and is responsive to sound waves external to the helmet. One or more external speaker devices are mounted on the helmet to issue sound waves externally to the helmet. An internal microphone device is positioned to be responsive to speech of the wearer, and an internal speaker device is mounted within the helmet to couple sound waves to an ear of the wearer. Additionally included is a signal coupler to couple signals that are representative of external sound waves from the external microphone device to the internal speaker device and to couple signals from the internal microphone device that are representative of speech of the wearer to the external speaker device.

For a better understanding of the invention, together with other and further objects, reference is made to the accompanying drawings, with the scope of the invention pointed out in the appended claims.

In the drawings, like elements are assigned like reference numerals. The drawings are briefly described as follows.

FIG. 1 is a side view of one embodiment of a self-contained communication system in accordance with the invention.

FIG. 2 is a plan view of the FIG. 1 communication system.

FIG. 3 is a partial, sectional side view showing an alternative mounting of an external microphone.

FIG. 4 is a functional block diagram of components of an embodiment of a helmet communication system of the invention.

Referring now to FIG. 1, there is illustrated a self-contained helmet communication system 10 in accordance with the present invention, shown as including a helmet 14, which is supportable on the head of the wearer. The helmet 14 is adapted to support other elements of the communication system. Mounted on the helmet 14 is an external microphone device 16a which is responsive to sound waves external to the helmet. Such sound waves may typically represent speech of a nearby person or other sounds. An external speaker device 18a is mounted on the helmet 14 and arranged to issue sound waves externally to the helmet. The sound waves issued are representative of speech of the wearer of the helmet 14.

As illustrated in FIG. 1, the system includes an internal microphone device 26, which is mounted on the helmet 14 and is responsive to speech of the wearer. The internal microphone device 26 detects sound waves representing speech of the wearer and produces a signal representative of the sound waves. An internal speaker device 28a, also mounted on the helmet 14, is included to couple sound waves to an ear of the wearer.

Further included in the FIG. 1 system is a signal coupler 32. The signal coupler 32 is included to couple signals representative of external sound waves from the external microphone device 16a to the internal speaker device 28a and to couple signals representative of speech of the wearer from the internal microphone device 26 to the external speaker device 18a. Signal coupler 32 may include a volume control 36 to permit the level of signals coupled to the internal speaker device 28a, and possibly the external speaker device 18a, to be adjusted. One embodiment of the signal coupler 32, provided in the form of an audio signal amplifier, will be discussed further when referring to FIG. 4.

For present purposes, the word "helmet" is defined to include a motorcycle or race car driver's helmet, as well as any head gear supportable on the head of the wearer resembling a helmet or otherwise suitable for use in a self-contained communication system in accordance with the invention. Each of microphone devices 16a and 26, and speaker devices 18a and 28a, may be any suitable type of device available for use as a transducer to convert between airborne sound waves, or visa versa. Actual devices can be selected on the basis of size, weight, operating characteristics, cost, durability and other factors relevant to particular applications of the invention. Correspondingly, selection of amplifier devices, connectors, wiring, switches, batteries, solar cells, and other electrical and mechanical components of signal coupler 32 to provide effective and economical intercoupling of signals between the various transducer devices can be made as appropriate for particular applications by skilled persons having an understanding of the invention. Many variations will be apparent to such persons. Thus, the signal coupler unit 32 may be carried on the wearer's belt or in a pocket and connected by a suitable flexible cable. Similarly, transducer components may be fastened or adhered to the helmet, or molded into the helmet, etc.

As configured in FIG. 1, the self-contained communication system 10 is capable of supporting oral communication with a person on the left side of the helmet wearer, and positioned at or near the same height as the wearer. However, components such as the external microphone device 16a or the external speaker device 18a may be located in positions different from those illustrated. For example, external microphone device 16a may be located at any position on the left side of the helmet 14 (and the wearer). It should be noted that the term "left side" is defined as indicating at any position or location on the entire hemispherical left side of the helmet. Similarly, the term "right side" is defined as indicating at any position or location on the entire hemispherical right side of the helmet 14. Thus, if the helmet 14 is to be worn by a race car driver, it may be advantageous to position the external microphone device 16a at a location near the top of the helmet 14, favoring one side or the other, and not positioned as shown in FIG. 1. This would allow the driver to communicate with a person standing next to the car, without the person having to bend over or kneel down. This placement, as well as other possible placements are contemplated as being within the scope of the present invention.

As depicted in FIG. 1, the helmet 14 is configured with a full face shield 12, an accessory utilized with a variety of safety helmets currently in use. The face shield 12 provides additional protection to the face of the wearer. However, due to the fact that the shield also covers much of the open front area of the helmet 14, it also severely limits the ability of the wearer to communicate orally with nearby persons. Should a face shield be omitted, the present invention may be employed in a modified embodiment to aid in oral communication between the wearer and a nearby person. Thus, for helmet configurations and applications whereby the wearer may be able to effectively speak to a nearby person, the invention may still be employed to enable the wearer to hear speech of the nearby person. In this embodiment the internal microphone device 26 and external speaker device 18a may be omitted, while retaining the external microphone device 16a and internal speaker device 28a.

Referring now to FIG. 2, there is provided a plan view of the FIG. 1 embodiment of the invention. As shown in FIG. 2, a second group of transducers including the external microphone device 16b, the external speaker device 18b, and internal speaker device 28b are mounted on the right side of the helmet. The external microphone device 16b and the external speaker device 18b are provided to support oral communications with an individual on the right side of the wearer. As stated, it will be understood that placement of the external components including the external microphone devices 16a and 16b, and the external speaker devices 18a and 18b, may be varied to achieve desired operating results. For example, with reference to FIG. 3 there is shown a partial, sectional side view of a top portion of helmet 14 including an alternative microphone mounting configuration. As shown, an external microphone 16c is mounted in a position at or near the top of the helmet (when the helmet is worn) and located in a depression 38. For a motorcycle operator desiring to communicate with a person standing nearby, the bystander's voice will take the form of sound waves received from a point external to the helmet and located above a horizontal plane represented at 39 which passes through the middle of the helmet. At the same time, the environment near a busy street or at a race track may include relatively loud ambient noise coming largely from engines or tire/road contact. Such ambient noise may thus be largely incident at the wearer's helmet from sub-horizontal angles (at angles below plane 39). Under these conditions, with proper proportioning of depression 38 and selection of microphone 16c, the FIG. 3 arrangement will be responsive to sound waves received from external points above horizontal plane 39 and will at least partially impede reception of noise incident from sub-horizontal angles. As also shown in FIG. 3 it may be desirable to include voice band-pass filter 42 as a component of signal coupler 32. Using known techniques for speech processing, electrical signals may be subjected to a filtering effect to favor signals in the range of frequencies representing a speech band, while attenuating other signals.

Further illustrated in FIG. 2 is a solar cell array 40b mounted on the upper portion of helmet 14. The solar cell array 40b is a component of a power source to power the helmet communication system 10. The power source may be configured to utilize the solar cell array to fully power the communication system 10, or alternatively to recharge rechargeable batteries included with the power source. The solar cell array 40b and the power source will be discussed further below. It can be noted that solar cell array 40b and microphone 16c of FIG. 3 can be positioned one in front of the other, should both be included on a helmet.

Referring now to FIG. 4 there is provided a functional block diagram of an embodiment of the helmet communication system 10 of the present invention, exclusive of helmet 14. This embodiment, as illustrated includes a first communication channel comprising a first amplifier channel 32a coupling the external microphone device 16a to the internal speaker device 28a, and a second communication channel comprising a second amplifier channel 32b to couple the internal microphone device 26 to the external speaker device 18a. Persons skilled in the art will understand the variety of approaches that may be used to implement arrangements suitable for different applications. A low cost configuration may, for example, comprise of one or more integrated circuit (IC) devices. A higher cost configuration may employ analog filtering and signal conditioning, and/or digital signal processing (DSP) techniques to ensure that high quality sound is coupled from a microphone device to a speaker device. A variety of approaches and circuits may be employed to provide the necessary signal coupling.

As illustrated in FIG. 4, the signal coupler 32 is provided as an audio signal amplifier, which as shown may be comprised of a first amplifier channel 32a and a second amplifier channel 32b with associated components and wiring suitable to interconnect and support the operation of the various transducers. The first amplifier channel 32a provides coupling between the external microphone device 16a and the internal speaker device 28a. The signal provided by the external microphone device 16a, which is representative of external sound waves, such as speech of a nearby person, is boosted by the first amplifier channel 32a to an appropriate level to properly drive the internal speaker device 28a. A volume control 36 may be included to permit the wearer to adjust the level of the signal coupled to the internal speaker device 28a. The second amplifier channel 32b provides coupling between the internal microphone device 26 and the external speaker device 18a. The internal microphone device 26 is responsive to speech of the wearer and provides a signal that is boosted by the second amplifier channel 32b to an appropriate level to properly drive the external speaker device 18a to issue externally a representation of the wearer s speech. It can be noted that the second amplifier channel 32b may also be configured to be responsive to volume control 36. Alternatively, the second amplifier channel 32b may be configured with a volume controlling means such as an automatic gain control (AGC) circuit to automatically adjust the sound level coupled to external speaker device 18a.

Devices such as audio signal amplifiers 32a and 32b as provided in FIG. 4 can be adapted to allow for the inclusion of additional external microphone devices, such as external microphone device 16b. Similarly, additional external speaker devices, such as external speaker device 18b, may be readily included. It should be noted that if the helmet communication system 10 is configured with a second external microphone device such as 16b, first amplifier channel 32a may be altered to include two independent volume controls, one for each external microphone. This modification would allow the wearer to independently adjust the coupling of each external microphone device 16a and 16b and select the desired external sound source. It should also be noted that the internal speaker devices 28a and 28b may be provided as earphone devices. Indeed, skilled persons will appreciate the variety of configurations which are possible with various combinations of microphone and speaker devices available in the art.

Referring again to FIG. 4, illustrated is a power source 40, including one or more battery units 40a. The power source 40 may further include an array of solar cells 40b. With battery units 40a provided as rechargeable batteries, the inclusion of the solar cell array 40b provides a power source to recharge battery units 40a when the ambient light intensity is at a sufficient level. On/Off switch 40c may be included to allow the helmet communication system 10 to be selectively powered on or off.

While there have been described the currently preferred embodiments of the present invention, those skilled in the art will recognize that other and further modifications may be made without departing from the invention and it is intended to claim all modifications and variations as fall within the scope of the invention.