Processing method based on OFDM-TDMA two-way service and communications device
US-9838073-B2 · Dec 5, 2017 · US
Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04B3/20 |
| Official title | Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other |
| Display label | Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other |
| Total patents | 158 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 20 |
| 2016 | 26 |
| 2017 | 22 |
| 2018 | 20 |
| 2019 | 16 |
| 2020 | 15 |
| 2021 | 12 |
| 2022 | 6 |
| 2023 | 2 |
| 2024 | 10 |
| 2025 | 7 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Millimeter wave transmission device, millimeter wave transmission method, and millimeter wave transmission system
US-9825667-B2 · Nov 21, 2017 · US
Methods for processing audio signals and circuit arrangements therefor
US-9768829-B2 · Sep 19, 2017 · US
Multiple Upstream Split Support in a Fiber-Deep HFC Network
US-2017237492-A1 · Aug 17, 2017 · US
Duplex audio for mobile communication device and accessory
US-9712659-B2 · Jul 18, 2017 · US
Hybrid coil circuit
US-2017125902-A1 · May 4, 2017 · US
Millimeter wave transmission device, millimeter wave transmission method, and millimeter wave transmission system
US-9608683-B2 · Mar 28, 2017 · US
Infotainment system control
US-9598070-B2 · Mar 21, 2017 · US
Method and apparatus for controlling interference in communication system using multiple antennas
US-2017047966-A1 · Feb 16, 2017 · US
User feedback on microphone placement
US-9558758-B1 · Jan 31, 2017 · US
Electrical duplex to optical conversion
US-9553634-B2 · Jan 24, 2017 · US
Interference relationship characterization in full duplex cable network environments
US-2017019242-A1 · Jan 19, 2017 · US
Full duplex network architecture in cable network environments
US-2017019241-A1 · Jan 19, 2017 · US
Procedure and mechanism for controlling and using voice communication
US-9542957-B2 · Jan 10, 2017 · US
Full duplex wireless communications on devices with limited echo cancellation capabilities
US-9503249-B2 · Nov 22, 2016 · US
Duplex audio for mobile communication device and accessory
US-2016337501-A1 · Nov 17, 2016 · US
Systems and methods for surround sound echo reduction
US-9497544-B2 · Nov 15, 2016 · US
Managing Telephony and Entertainment Audio in a Vehicle Audio Platform
US-2016323671-A1 · Nov 3, 2016 · US
Impedance adjustment method, delay capacitance adjustment method and associated apparatus for communication device
US-9484983-B2 · Nov 1, 2016 · US
Full-duplex transceiver circuit and method thereof
US-9473204-B2 · Oct 18, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04B3/20?
- CPC H04B3/20 is the Cooperative Patent Classification code for “Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other.”
- How many patents are filed under CPC H04B3/20 (Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other)?
- Our database includes 158 publications tagged with this CPC code.
- Is patent activity under CPC H04B3/20 growing?
- Publication counts under this code: 10 in 2024 vs 7 in 2025 (latest complete years).