Acoustic dampening compensation system
At least one exemplary embodiment is directed to a communication device that includes a microphone configured to detect an acoustic signal from an acoustic environment, and a processor, configured to detect an acoustical dampening between the acoustic environment and the microphone, based on a change in a characteristic of the acoustic signal and, responsive to the acoustical dampening, apply a compensation filter to the acoustic signal to form a compensated acoustic signal that is reproduced. Other embodiments are disclosed.
1. A headset system comprising:
a first Ambient Sound Microphone (ASM), where the first ASM is part of a headphone configured to be inserted into an ear of a user, where the first ASM is configured to be positioned outside the entrance of a user's ear canal and generates a first ASM signal;
a second ASM, where the second ASM is part of the headphone configured to be partially inserted into an ear of a user, where the second ASM is configured to be positioned outside the entrance of a user's ear canal and generates a second ASM signal;
a third ASM, where the third ASM generates a third ASM signal, where the third ASM is in a communication device, where the communication device is wirelessly connected to the headphone, and wherein the third ASM is configured to be positioned outside the entrance of a user's ear canal;
a speaker;
a memory that stores instructions; and
a signal processing unit in at least one of the headphone or the communication device, where the signal processing unit is configured to execute the instructions to perform operations, where the operations comprise:
receiving the first ASM signal, the second ASM signal, and the third ASM signal;
sending a test signal to the speaker;
analyzing at least one of the first ASM signal, the second ASM signal, or the third ASM signal to determine whether the headphone is being wore by the user;
generating a conditioned ASM signal; and
sending the conditioned ASM signal to the speaker.
2. The system according to claim 1 , wherein the conditioned ASM signal includes at least part of the third ASM signal.
3. A beam forming platform system comprising:
a first Ambient Sound Microphone (ASM), where the first ASM is part of a first headphone configured to be inserted into an ear of a user, wherein the first ASM is configured to be positioned outside the entrance of a user's ear canal and generates a first ASM signal;
a second ASM, where the second ASM is part of a second headphone configured to be inserted into an ear of a user, wherein the second ASM is configured to be positioned outside the entrance of a user's ear canal and generates a second ASM signal;
a third ASM, where the third ASM generates a third ASM signal, wherein the third ASM is either in the first headphone or the second headphone, and wherein the third ASM is configured to be positioned outside the entrance of a user's ear canal;
a signal processing unit in at least one of the first headphone, or the second headphone, wherein the signal processing unit is configured to input the first ASM signal, the second ASM signal, and the third ASM signal and generate a conditioned ASM signal, where the conditioned ASM signal is a direction-dependent sensitive signal;
a loudspeaker, wherein the loudspeaker is configured to play the conditioned ASM signal as audio, wherein the audio is representative of a spatial sensitivity of the system to sound in the user's local environment;
a low pass filter, where the signal processing unit is configured to apply the low pass filter to a signal derived from the first ASM signal in the process of generating the conditioned ASM signal;
wherein the first ASM has a first sampling frequency;
wherein the second ASM has a second sampling frequency;
wherein the third ASM has a third sampling frequency;
wherein the low pass filter includes a cutoff frequency value;
wherein the cutoff frequency value is equal to or less than half of the lowest value of one of the first digital sampling frequency, the second digital sampling frequency, or the third digital sampling frequency;
a first frequency sensitivity associated with the first ASM;
a second frequency sensitivity associated with the second ASM; and
a third frequency sensitivity associated with the third ASM, where the signal processing circuit is configured to equalize the first ASM signal using the first frequency sensitivity, where the signal processing circuit is configured to equalize the second ASM using the second frequency sensitivity, and where the signal processing circuit is configured to equalize the third ASM using the third frequency sensitivity.
4. The system according to claim 3 , further including:
a memory that stores instructions, wherein the signal processing unit is configured to execute the instructions to perform operations, wherein the operations include:
sending a test signal to the speaker; and
analyzing the first ASM signal to determine whether the first headphone is positioned at the entrance of a user's ear canal.
5. The system according to claim 4 , further including:
a memory that stores instructions, wherein the signal processing unit is configured to execute the instructions to perform operations, wherein the operations include:
generating an attenuation transmission index from analyzing at least one of the first ASM signal or second ASM signal; and
filtering at least one of the first ASM signal or second ASM signal by applying an inverse of the attenuation transmission index.
6. The system according to claim 3 , further including:
a memory that stores instructions, wherein the signal processing unit is configured to execute the instructions to perform operations, wherein the operations include:
sending a test signal to the speaker; and
analyzing the second ASM signal to determine whether the second headphone is positioned at the entrance of a user's ear canal.