Two-way communications earset

Claim 2

A one piece two-way simultaneous voice transmitting and receiving device comprising: a receiver for emitting sound primarily to the ear canal of a user; and a transmitter, coupled to the receiver, comprising: a first microphone for sound pickup adapted to be located outside the ear canal at a first position relative to the mouth of the user and outputting a first signal; and a second microphone for sound pickup spaced from the first microphone and adapted to be located outside the ear canal at a second position relative to the mouth of the user farther from the mouth of the user than the first position and outputting a second signal; subtracting means, coupled to the first and second microphones, for subtracting one of the first and second signals from the other and for outputting a third signal with a degree of amplification; and reducing means, coupled to the subtracting means, for reducing the degree of amplification of the third signal to a first extent if a sound level at said transmitter means is greater than a selected threshold and for reducing the degree of amplification of the third signal to a greater extent than the first extent when the sound level is less than the selected threshold.

Claim 3

The one piece two-way simultaneous voice transmitting and receiving device according to claim 1, wherein the reducing means comprises: a signal level detection circuit which receives the third signal from an input terminal and which detects the level of the third signal; a signal generating circuit, coupled to the signal level detection circuit, for outputting a control signal based on the level detected by the signal level detection circuit; a logarithmic amplifier, coupled to the signal generating circuit, which receives the third signal and amplifies the third signal based on the control signal output from the signal generating circuit; a dividing circuit, coupled to the logarithmic amplifier, which divides the amplified third signal; an amplifier, coupled to the dividing circuit, which amplifies a first output of the dividing circuit and outputs an amplified signal to the receiver; and an output line, coupled to the dividing circuit, for outputting a second output of the dividing circuit to the transmitter.

Claim 4

A one piece two-way simultaneous voice transmitting and receiving device comprising: an ear cover adapted to hang at the auricle of a user's ear; a speaker attached to an inside portion of the ear cover and facing the entrance of the user's ear canal; a transmitter, coupled to an outside portion of said ear cover, comprising: a first microphone for sound pickup adapted to be located outside the ear canal at a first position relative to the mouth of the user and outputting a first signal; and a second microphone for sound pickup spaced a distance away from the first microphone and adapted to be located outside the ear canal at a second position relative to the mouth of the user farther from the mouth of the user than the first position and outputting a second signal; subtracting means, coupled to the first and second microphones, for subtracting one of the first and second signals from the other and for outputting a third signal with a degree of amplification; and reducing means, coupled to the subtracting means, for reducing the degree of amplification of the third signal to a first extent if a sound level at said transmitter means is greater than a selected threshold and for reducing the degree of amplification of the third signal to a greater extent than the first extent when the sound level is less than the selected threshold.

Claim 5

A one piece two-way simultaneous voice transmitting and receiving device comprising: an ear cover adapted to hang at the auricle of a user's ear; a speaker attached to an inside portion of the ear cover and facing the entrance of the user's ear canal; a transmitter, coupled to an outside portion of said ear cover, comprising: a first microphone for sound pickup adapted to be located outside the ear canal at a first position relative to the mouth of the user and outputting a first signal; and a second microphone for sound pickup spaced a distance away from the first microphone and adapted to be located outside the ear canal at a second position relative to the mouth of the user farther from the mouth of the user than the first position and outputting a second signal; subtracting means, coupled to the first and second microphones, for subtracting one of the first and second signals from the other and for outputting a third signal with a degree of amplification; and reducing means, coupled to the subtracting means, for reducing the degree of amplification of the third signal to a first extent if a sound level at said transmitter means is greater than a selected threshold and for reducing the degree of amplification of the third signal to a greater extent than the first extent when the sound level is less than the selected threshold.