METHOD AND DEVICE FOR SUPPRESSION OF MICROPHONE SQUEAL AND CABLE NOISE
At least one exemplary embodiment is directed to a method of suppressing cable acoustic noise or reducing microphone squeal.
1 . An earphone cable acoustic noise suppression system comprising:
a cable configured to carry a signal, wherein a communication device is attached to the cable and the earphone is attached to the cable; and
an acoustic reflective element, wherein the acoustic reflective element is attached to the cable at a location, wherein the acoustic reflective element does not carry the signal, wherein the acoustic reflective element has an acoustic impedance different than an acoustic impendence of the cable, where a vibrational wave traveling in or on the cable from communication device toward the earphone partially reflects away from the acoustic reflective element at the location back toward the communication device and partially transmits towards the earphone, wherein the vibrational wave has an first intensity A1, wherein the reflected portion of the vibrational wave has a second intensity A3, and the ratio of the second intensity to the first intensity has a value between 0.2 and 1.0.
2 . The earphone cable acoustic noise suppression system according to claim 1 , wherein an acoustic impedance of the acoustic reflective element is I1, wherein an acoustic impedance of the cable is I2, and where the ratio of intensities A3/A1 is calculated using the formula:
A 3/ A 1=[( I 1− I 2){circumflex over ( )}2]/[( I 1+ I 2){circumflex over ( )}2].
3 . The earphone cable acoustic noise suppression system according to claim 2 , wherein the cable carries an electrical signal.
4 . The earphone cable acoustic noise suppression system according to claim 2 , wherein the cable carries an optical signal.
5 . The earphone cable acoustic noise suppression system according to claim 2 , wherein the acoustic reflective element includes a first material, the cable includes a second material, and where the first and second materials are different materials.
6 . The earphone cable acoustic noise suppression system according to claim 2 , wherein the acoustic reflective element and the cable includes a first material, and wherein the acoustic reflective element's first material is more compressed than the first material in the cable.
7 . The earphone cable acoustic noise suppression system according to claim 6 , including a compression element where the compression element compresses the first material in the acoustic reflective element.
8 . The cable acoustic noise suppression system according to claim 7 , wherein the compression element is at least one of a clip and an elastic element.
9 . A wired earphone system comprising:
a cable connecting the earphone to a communication device;
a cable acoustic noise suppression system attached to the cable configured to reduce vibrational noise traveling along the cable from the communication device to the earphone;
a microphone;
a speaker;
a memory having computer instructions; and
a processor coupled to the memory, the microphone, and the speaker, the computer instructions thereby causing the processor to perform operations comprising:
receiving an audio signal through the cable from the communication device;
modifying the audio signal to an output signal; and
sending the output signal to the speaker.
10 . A wired earphone system according to claim 9 , wherein a cable acoustic noise suppression comprises:
an acoustic reflective element, wherein the acoustic reflective element is attached to the cable at a location, wherein the acoustic reflective element does not carry the signal, wherein the acoustic reflective element has an acoustic impedance different than an acoustic impendence of the cable, where a vibrational wave traveling in or on the cable from communication device toward the earphone partially reflects away from the acoustic reflective element at the location back toward the communication device and partially transmits towards the earphone, wherein the vibrational wave has an first intensity A1, wherein the reflected portion of the vibrational wave has a second intensity A3, and the ratio of the second intensity to the first intensity has a value between 0.2 and 1.0.
11 . A wired earphone system according to claim 10 , wherein an acoustic impedance of the acoustic reflective element is I1, wherein an acoustic impedance of the cable is I2, and where the ratio of intensities A3/A1 is calculated using the formula:
A 3/ A 1=[( I 1− I 2){circumflex over ( )}2]/[( I 1+ I 2){circumflex over ( )}2].
12 . The earphone cable acoustic noise suppression system according to claim 11 , wherein the cable carries an electrical signal.
13 . The earphone cable acoustic noise suppression system according to claim 11 , wherein the cable carries an optical signal.
14 . The earphone cable acoustic noise suppression system according to claim 11 , wherein the acoustic reflective element includes a first material, the cable includes a second material, and where the first and second materials are different materials.
15 . The earphone cable acoustic noise suppression system according to claim 11 , wherein the acoustic reflective element and the cable includes a first material, and where in the acoustic reflective element's first material is more compressed than the first material in the cable.
16 . The earphone cable acoustic noise suppression system according to claim 15 , including a compression element where the compression element compresses the first material in the acoustic reflective element.
17 . The cable acoustic noise suppression system according to claim 16 , wherein the compression element is at least one of a clip and an elastic element.