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IPC 7
H03D-H03D01300

SECTION H – ELECTRICITY


H 03BASIC ELECTRONIC CIRCUITRY


H 03 DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K 9/00; transforming types of pulse modulation H03K 11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B 7/14; demodulators adapted for digitally modulated-carrier systems H04L 27/00; synchronous demodulators adapted for colour television H04N 9/66)


Note

 This subclass covers only:

 demodulation or transference of signals modulated on a sinusoidal carrier or on electromagnetic waves;

 comparing phase or frequency of two mutually-independent oscillations.


Subclass Index

DEMODULATION 

Amplitude; angle; combined; super-regenerative 

H03D 1/00; H03D 3/00; H03D 5/00, H03D 9/00; H03D 11/00 

TRANSFERENCE 

H03D 7/00, H03D 9/00 

COMPARING PHASE OR FREQUENCY 

H03D 13/00 



1/

00Demodulation of amplitude-modulated oscillations (H03D 5/00, H03D 9/00, H03D 11/00 take precedence)

1/

02.Details

1/

04..Modifications of demodulators to reduce interference by undesired signals

1/

06..Modifications of demodulators to reduce distortion, e.g. by negative feedback

1/

08.by means of non-linear two-pole elements (H03D 1/22, H03D 1/26, H03D 1/28 take precedence)

1/

10..of diodes

1/

12...with provision for equalising ac and dc loads

1/

14.by means of non-linear elements having more than two poles (H03D 1/22, H03D 1/26, H03D 1/28 take precedence)

1/

16..of discharge tubes

1/

18..of semiconductor devices

1/

20..with provision for preventing undesired type of demodulation, e.g. preventing anode detection in a grid detection circuit

1/

22.Homodyne or synchrodyne circuits

1/

24..for demodulation of signals wherein one sideband or the carrier has been wholly or partially suppressed

1/

26.by means of transit-time tubes

1/

28.by deflecting an electron beam in a discharge tube (H03D 1/26 takes precedence)


3/

00Demodulation of angle-modulated oscillations (H03D 5/00, H03D 9/00, H03D 11/00 take precedence)

3/

02.by detecting phase difference between two signals obtained from input signal (H03D 3/28 to H03D 3/32 take precedence; limiting arrangements H03G 11/00)

3/

04..by counting or integrating cycles of oscillations

3/

06..by combining signals additively or in product demodulators

3/

08...by means of diodes, e.g. Foster-Seeley discriminator

3/

10....in which the diodes are simultaneously conducting during the same half period of the signal, e.g. ratio detector

3/

12...by means of discharge tubes having more than two electrodes

3/

14...by means of semiconductor devices having more than two electrodes

3/

16...by means of electromechanical resonators

3/

18..by means of synchronous gating arrangements

3/

20...producing pulses whose amplitude or duration depends on the phase difference

3/

22..by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector

3/

24..Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits

3/

26.by means of sloping amplitude/frequency characteristic of tuned or reactive circuit (H03D 3/28 to H03D 3/32 take precedence)

3/

28.Modifications of demodulators to reduce effect of temperature variations (automatic frequency control H03L)

3/

30.by means of transit-time tubes

3/

32.by deflecting an electron beam in a discharge tube (H03D 3/30 takes precedence)

3/

34.by means of electromechanical devices (H03D 3/16 takes precedence)  [3]


5/

00Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will (H03D 9/00, H03D 11/00 take precedence)


7/

00Transference of modulation from one carrier to another, e.g. frequency-changing (H03D 9/00, H03D 11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as frequency-changers H03F)

7/

02.by means of diodes (H03D 7/14 to H03D 7/22 take precedence)

7/

04..having negative resistance characteristic, e.g. tunnel diode

7/

06.by means of discharge tubes having more than two electrodes (H03D 7/14 to H03D 7/22 take precedence)

7/

08..the signals to be mixed being applied between the same two electrodes

7/

10..the signals to be mixed being applied between different pairs of electrodes

7/

12.by means of semiconductor devices having more than two electrodes (H03D 7/14 to H03D 7/22 take precedence)

7/

14.Balanced arrangements

7/

16.Multiple frequency-changing

7/

18.Modifications of frequency-changers for eliminating image frequencies

7/

20.by means of transit-time tubes

7/

22.by deflecting an electron beam in a discharge tube (H03D 7/20 takes precedence)


9/

00Demodulation or transference of modulation of modulated electromagnetic waves (devices or arrangements for demodulating light, transferring modulation in light waves G02F 2/00)

9/

02.Demodulation using distributed inductance and capacitance, e.g. in feeder lines

9/

04..for angle-modulated oscillations

9/

06.Transference of modulation using distributed inductance and capacitance


11/

00Super-regenerative demodulator circuits

11/

02.for amplitude-modulated oscillations

11/

04..by means of semiconductor devices having more than two electrodes

11/

06.for angle-modulated oscillations

11/

08..by means of semiconductor devices having more than two electrodes


13/

00Circuits for comparing the phase or frequency of two mutually-independent oscillations


  
 

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