Communication device with active equalization and method therefor
First Claim
Patent Images
1. A communication device comprising:
- an earpiece for transmitting an acoustic output signal from the communication device;
a sensor, wherein the sensor is proximately located with the earpiece, for measuring an acoustic pressure at the earpiece and generating a response signal; and
an active equalization circuit coupled to the sensor and receiving the response signal for equalizing the acoustic output signal at the earpiece.
1 Assignment
0 Petitions
Accused Products
Abstract
A communication device (10,110) includes an earpiece (14), a sensor (20), and an active equalization circuit (22). The earpiece (14) transmits an acoustic output signal (59) from the communication device (10,110). The sensor (10) is proximately located with the earpiece (14) and measures an acoustic pressure (61) at the earpiece (14) and generates a response signal (56). The active equalization circuit (22) is coupled to the sensor (20) and equalizes the acoustic output signal (59) using the response signal (56).
65 Citations
19 Claims
-
1. A communication device comprising:
-
an earpiece for transmitting an acoustic output signal from the communication device;
a sensor, wherein the sensor is proximately located with the earpiece, for measuring an acoustic pressure at the earpiece and generating a response signal; and
an active equalization circuit coupled to the sensor and receiving the response signal for equalizing the acoustic output signal at the earpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A communication device comprising:
-
a sensor port for receiving an acoustic pressure between the communication device and an ear;
a sensor communication path coupled to the sensor port for providing a first acoustic path for the received acoustic pressure;
a sensor coupled to the sensor communication path, wherein the sensor monitors the acoustic pressure received at the sensor port through the sensor communication path and generates a response signal; and
an active equalization circuit coupled to the sensor and receiving the response signal for equalizing an acoustic output signal at the ear, wherein the active equalization circuit includes a sensor transfer function of the sensor communication path. - View Dependent Claims (14, 15)
-
-
16. Within a communication device, a method of active equalization comprising:
-
receiving a first audio signal;
filtering the first audio signal using a filter response value, thereby generating a first filtered audio signal;
transmitting the first filtered audio signal through an earpiece;
measuring an acoustic pressure at the earpiece;
adjusting the filter response value using the measured acoustic pressure, thereby generating an adjusted filter response value;
receiving a second audio signal;
filtering the second audio signal using the adjusted filter response value; and
transmitting the second filtered audio signal through the earpiece.
-
-
17. Within a communication device, a method of active equalization comprising:
-
fast fourier transforming a response data signal received from a sensor proximately located with an earpiece, thereby generating a transformed response data signal;
fast fourier transforming a digital input signal received from an audio processing block, thereby generating a transformed digital input signal;
dividing the transformed response data signal and the transformed digital input signal, thereby generating a divided signal;
estimating a transfer function using the divided signal;
averaging the transfer function thereby generating a frequency response;
smoothing the frequency response in a frequency domain using a moving average window;
inverting the smoothed frequency response;
inverse fast fourier transforming the inverted transfer function to generate a real valued impulse response;
equalizing the earpiece using a finite impulse response digital filter. - View Dependent Claims (18, 19)
-
Specification