H04B 1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
Introduced: September 1968
Title
Titles differ between systems:
IPC: Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission
CPC: Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
Full Title
Full titles differ between systems:
Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission
Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
Additional Content IPC
Glossary
Homodyne receiver A receiver which involves multiplying the modulated received signal by a local oscillator which has the same frequency as that associated with the received signal, so that the received signal will be directly converted into the baseband. Superheterodyne receiver superheterodyne receivers A receiver in which the frequency of the incoming signal is reduced in a mixer or frequency changer by heterodyning with another frequency at the local oscillator. (Heterodyning: combining two sinusoidal frequencies radio frequency waves in a non-linear device resulting in sum and difference frequencies). Synchrodyne receiver synchrodyne receivers A receiver in which a mixing carrier signal is inserted in exact synchronism with the original carrier at the transmitter. Used for the selective detection of signals coded in a certain way.
Limiting references
Demodulation or transference of modulation from one carrier to another
Of 14 combined children, 12 exist in both systems.
2 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving +1 CPC IPC+CPC Available in IPC and CPC
- H04B 1/62 for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio IPC+CPC Available in IPC and CPC
- H04B 1/66 for reducing bandwidth of signals; for improving efficiency of transmission (H04B1/68 takes precedence) +3 CPC IPC+CPC Available in IPC and CPC
- H04B 1/68 for wholly or partially suppressing the carrier or one side band IPC+CPC Available in IPC and CPC
- H04B 1/72 Circuits or components for simulating antennas, e.g. dummy antennas IPC+CPC Available in IPC and CPC
- H04B 1/74 for increasing reliability, e.g. using redundant or spare channels or apparatus since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- H04B 1/76 Pilot transmitters or receivers for control of transmission or for equalising since 1980 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class H04,2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 97,396
- HUAWEI TECHNOLOGIES COMPANY CN 96,502
- SAMSUNG ELECTRONICS COMPANY KR 86,981
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
- HUAWEI TECHNOLOGIES COMPANY 55,349
- LG ELECTRONICS KR 53,649
- CANON 33,341
- SONY CORPORATION JP 32,761
- ZTE CORPORATION CN 32,274
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327
Top Applicants (CPC)
Class H04,2013–2023, worldwide · Source: EPO PATSTAT
- HUAWEI TECHNOLOGIES COMPANY CN 101,476
- QUALCOMM US 101,139
- SAMSUNG ELECTRONICS COMPANY KR 96,655
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
- LG ELECTRONICS KR 55,253
- HUAWEI TECHNOLOGIES COMPANY 54,181
- SONY CORPORATION JP 35,309
- ZTE CORPORATION CN 32,950
- INTEL CORPORATION US 27,533
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498