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300

FREQUENCY SHIFT KEYING OR MINIMUM SHIFT KEYING DEMODULATOR

301

Including discrete semiconductor device

302

Input signal combined with local oscillator or carrier frequency signal

303

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

304

PHASE SHIFT KEYING OR QUADRATURE AMPLITUDE DEMODULATOR

305

Including discrete semiconductor device

306

Input signal combined with local oscillator or carrier frequency signal

307

Including phase or frequency locked loop

308

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

309

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

310

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

311

PULSE OR INTERRUPTED CONTINUOUS WAVE DEMODULATOR

312

Pulse width demodulator

313

Pulse position, frequency, phase or spacing demodulator

314

Including discrete semiconductor device

315

FREQUENCY MODULATION DEMODULATOR

316

Plural demodulation

317

Including amplitude demodulation

318

Having specific distortion, noise or other interference prevention, reduction or compensation

319

Using feedback to reduce distortion, noise or other interference

320

By cancelling distortion, noise or other interference

321

Using amplitude limiting within the demodulator

322

Including microwave or distributed parameter structure

323

Input signal combined with local oscillator or carrier frequency signal

324

Input signal applied directly to local oscillator

325

Including phase or frequency locked loop

326

Including discrete semiconductor device

327

Input signal split into plural signals

328

Including piezoelectric resonant element

329

Using a transformer to split input signal

330

Signals taken from primary and secondary windings

331

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

332

Signals taken from plural secondary windings

333

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

334

Including resonant circuits tuned above and below input signal carrier frequency

335

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

336

Input signal combined with phase shifted or delayed portion of input signal

337

Including LC resonant phase shift circuit

338

Input signal split by LC resonant circuit

339

Including LC resonant circuits tuned above and below input signal carrier frequency

340

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

341

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

342

Including discrete semiconductor device

343

Including digital logic circuitry

344

Including signal passed through single demodulating path including resonant circuit

345

PHASE MODULATION DEMODULATOR

346

Input signal combined with local oscillator or carrier frequency signal

347

AMPLITUDE MODULATION DEMODULATOR

348

Having plural demodulation outputs

349

Having specific distortion, noise or other interference prevention, reduction or compensation

350

Automatic amplitude stabilization or control

351

Nonlinearity reduction or compensation

352

Temperature compensation

353

Noise reduction or compensation

354

Including microwave or distributed parameter structure

355

With electron discharge device

356

Suppressed carrier double sideband type

357

Single or vestigial sideband type

358

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

359

Input signal applied directly to local oscillator

360

Including phase or frequency locked loop

361

Including sampling, gating, or switching

362

With three or more terminal discrete semiconductor device

363

Input signal split into plural signals

364

Including three or more terminal discrete semiconductor device

365

Including diode demodulator device

366

Plural diodes

367

Including regenerative feedback in non-oscillating demodulator

368

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

369

Including three or more terminal discrete semiconductor demodulator device

370

Including diode demodulator device

371

Coherer type demodulator

372

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