Class   329	DEMODULATORS
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300

FREQUENCY SHIFT KEYING OR MINIMUM SHIFT KEYING DEMODULATOR

301

. (1 indent ) Including discrete semiconductor device

302

. (1 indent ) Input signal combined with local oscillator or carrier frequency signal

303

. (1 indent ) Including logic element (e.g., logic gate or flip-flop

304

PHASE SHIFT KEYING OR QUADRATURE AMPLITUDE DEMODULATOR

305

. (1 indent ) Including discrete semiconductor device

306

. (1 indent ) Input signal combined with local oscillator or carrier frequency signal

307

.. (2 indent ) Including phase or frequency locked loop

308

... (3 indent ) With parallel signal combiners (e.g., Costas loop)

309

.... (4 indent ) Including logic element (e.g., logic gate or flip-flop)

310

. (1 indent ) Including logic element (e.g., logic gate or flip-flop)

311

PULSE OR INTERRUPTED CONTINUOUS WAVE DEMODULATOR

312

. (1 indent ) Pulse width demodulator

313

. (1 indent ) Pulse position, frequency, phase or spacing demodulator

314

.. (2 indent ) Including discrete semiconductor device

315

FREQUENCY MODULATION DEMODULATOR

316

. (1 indent ) Plural demodulation

317

.. (2 indent ) Including amplitude demodulation

318

. (1 indent ) Having specific distortion, noise or other interference prevention, reduction or compensation

319

.. (2 indent ) Using feedback to reduce distortion, noise or other interference

320

.. (2 indent ) By cancelling distortion, noise or other interference

321

.. (2 indent ) Using amplitude limiting within the demodulator

322

. (1 indent ) Including microwave or distributed parameter structure

323

. (1 indent ) Input signal combined with local oscillator or carrier frequency signal

324

.. (2 indent ) Input signal applied directly to local oscillator

325

.. (2 indent ) Including phase or frequency locked loop

326

... (3 indent ) Including discrete semiconductor device

327

. (1 indent ) Input signal split into plural signals

328

.. (2 indent ) Including piezoelectric resonant element

329

.. (2 indent ) Using a transformer to split input signal

330

... (3 indent ) Signals taken from primary and secondary windings

331

.... (4 indent ) Including plural detector diodes (e.g., ratio detector type)

332

... (3 indent ) Signals taken from plural secondary windings

333

.... (4 indent ) Including plural detector diodes (e.g., ratio detector type)

334

....• (5 indent ) Including resonant circuits tuned above and below input signal carrier frequency

335

... (3 indent ) Including plural detector diodes (e.g., ratio detector type)

336

.. (2 indent ) Input signal combined with phase shifted or delayed portion of input signal

337

... (3 indent ) Including LC resonant phase shift circuit

338

.. (2 indent ) Input signal split by LC resonant circuit

339

... (3 indent ) Including LC resonant circuits tuned above and below input signal carrier frequency

340

.. (2 indent ) Including plural detector diodes (e.g., ratio detector type)

341

. (1 indent ) Input signal converted to and processed in pulse form (e.g., pulse counter or digital type demodulator)

342

.. (2 indent ) Including discrete semiconductor device

343

.. (2 indent ) Including digital logic circuitry

344

. (1 indent ) Including signal passed through single demodulating path including resonant circuit

345

PHASE MODULATION DEMODULATOR

346

. (1 indent ) Input signal combined with local oscillator or carrier frequency signal

347

AMPLITUDE MODULATION DEMODULATOR

348

. (1 indent ) Having plural demodulation outputs

349

. (1 indent ) Having specific distortion, noise or other interference prevention, reduction or compensation

350

.. (2 indent ) Automatic amplitude stabilization or control

351

.. (2 indent ) Nonlinearity reduction or compensation

352

.. (2 indent ) Temperature compensation

353

.. (2 indent ) Noise reduction or compensation

354

. (1 indent ) Including microwave or distributed parameter structure

355

.. (2 indent ) With electron discharge device

356

. (1 indent ) Suppressed carrier double sideband type

357

. (1 indent ) Single or vestigial sideband type

358

. (1 indent ) Input signal combined with local oscillator or carrier frequency signal (e.g., synchronous demodulator)

359

.. (2 indent ) Input signal applied directly to local oscillator

360

.. (2 indent ) Including phase or frequency locked loop

361

.. (2 indent ) Including sampling, gating, or switching

362

... (3 indent ) With three or more terminal discrete semiconductor device

363

. (1 indent ) Input signal split into plural signals

364

.. (2 indent ) Including three or more terminal discrete semiconductor device

365

.. (2 indent ) Including diode demodulator device

366

... (3 indent ) Plural diodes

367

. (1 indent ) Including regenerative feedback in non-oscillating demodulator

368

. (1 indent ) Electron discharge demodulator device having more than two electrodes (e.g., triode, tetrode etc.)

369

. (1 indent ) Including three or more terminal discrete semiconductor demodulator device

370

. (1 indent ) Including diode demodulator device

371

. (1 indent ) Coherer type demodulator

372

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