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Acoustic Technology, Inc. Patents |
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Assignee: Acoustic Technology, Inc.
Address: Mesa, AZ
No. of patents: 5
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 6990194 |
Dynamic balance control for telephone |
January 24, 2006 |
| A telephone includes a transmit channel and a receive channel, each including a bank of sub-band filters having a VAD coupled one to each sub-band filter. Each VAD measures the spectral energy in a sub-band, compares the spectral energy to a first threshold, and produces an output si |
| 6963642 |
Band-by-band full duplex communication |
November 8, 2005 |
| A telephone includes a first channel having a microphone input and a line output, a second channel having a line input and a speaker output, and each channel having a plurality of band pass filters with their outputs coupled to a multiplex circuit. The multiplex circuit selects subsets o |
| 6931124 |
Soft mute circuit |
August 16, 2005 |
| A soft mute circuit includes a programmable amplifier controlled by a register. Data is stored in the register from an adder that combines the current data in the register with a second number for increasing or decreasing the gain of the amplifier. A summation circuit includes a plur |
| 6928160 |
Estimating bulk delay in a telephone system |
August 9, 2005 |
| A bulk delay estimating circuit matches time intervals representing a signal with time intervals representing an echo of the signal to identify the echo and estimate bulk delay. Bulk delay is estimated by computing (1, 2, . . . n) intervals representing the signal, computing (1, 2, . . . |
| 6904146 |
Full duplex echo cancelling circuit |
June 7, 2005 |
| Sub-band filtering, adaptive echo cancellation, and residual echo suppression are selectively and separately applied in hierarchical order under the control of a circuit that monitors four separate signals to determine n machine states. The number of machine states is further divided |
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