Signal modification for control channel physical layer security
US-2023336979-A1 · Oct 19, 2023 · US
by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04K1/04 |
| Official title | by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band |
| Display label | by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band |
| Total patents | 79 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 6 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 5 |
| 2020 | 13 |
| 2021 | 13 |
| 2022 | 11 |
| 2023 | 9 |
| 2024 | 5 |
| 2025 | 5 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Voice morphing apparatus having adjustable parameters
US-11600284-B2 · Mar 7, 2023 · US
Optical communication system using mode-locked frequency comb and all-optical phase encoding for spectral and temporal encrypted and stealthy transmission, and for optical processing-gain applications
US-2022360337-A1 · Nov 10, 2022 · US
Communications system
US-2022360359-A1 · Nov 10, 2022 · US
Apparatus and method for generating jamming signal, communication system
US-2022353008-A1 · Nov 3, 2022 · US
Method for physical layer secured message scrambling
US-2022272527-A1 · Aug 25, 2022 · US
Method and apparatus for post-processing audio signal, storage medium, and electronic device
US-2022262388-A1 · Aug 18, 2022 · US
Method and system for unbiased interviewing
US-2022245594-A1 · Aug 4, 2022 · US
Scrambling for wireless communications
US-11399286-B2 · Jul 26, 2022 · US
Impairment based physical layer fingerprint
US-11395136-B2 · Jul 19, 2022 · US
System and method for continuous privacy-preserved audio collection
US-11350885-B2 · Jun 7, 2022 · US
Application of key exchange based physical layer security methods
US-2022094460-A1 · Mar 24, 2022 · US
Memory system for preventing write error
US-11269721-B2 · Mar 8, 2022 · US
Home automation having user privacy protections
US-2021314405-A1 · Oct 7, 2021 · US
In-home legacy device onboarding and privacy enhanced monitoring
US-11126525-B2 · Sep 21, 2021 · US
Selective enforcement of privacy and confidentiality for optimization of voice applications
US-11113419-B2 · Sep 7, 2021 · US
Covert acoustic communications through solid propagation channels using spread spectrum coding and adaptive channel pre-distortion
US-11108429-B1 · Aug 31, 2021 · US
Channelizing a wideband waveform for transmission on a spectral band comprising unavailable channel segments
US-2021258026-A1 · Aug 19, 2021 · US
Voice morphing apparatus having adjustable parameters
US-2021217431-A1 · Jul 15, 2021 · US
Impairment based physical layer fingerprint
US-2021092593-A1 · Mar 25, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04K1/04?
- CPC H04K1/04 is the Cooperative Patent Classification code for “by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band.”
- How many patents are filed under CPC H04K1/04 (by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band)?
- Our database includes 79 publications tagged with this CPC code.
- Is patent activity under CPC H04K1/04 growing?
- Publication counts under this code: 5 in 2024 vs 5 in 2025 (latest complete years).