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首页C++音频插件设计指南:深入AAX、AU与VST3 DSP理论实战
C++音频插件设计指南:深入AAX、AU与VST3 DSP理论实战
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更新于2024-06-26
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"Designing Audio Effect Plugins in C++. For AAX, AU, and VST3 with DSP Theory' 是一本由Will C. Pirkle编著的专业书籍,旨在引领读者进入音频插件设计的软件世界。这本书在当今音频行业备受瞩目,因为它深入探讨了音频处理的核心话题,即如何用C++编写实时音频效果插件,从而推动了从硬件到软件转变的音频设计革命。
书中涵盖了丰富的信号处理理论,从基础概念如数字信号处理(DSP)理论,到实际编程技巧,为读者提供了一套完整的工具包。作者将复杂的理论知识与实践操作相结合,确保读者不仅能够理解插件的工作原理,还能亲手创造出自己的音频处理解决方案。通过阅读这本书,学习者不仅可以实时播放自己设计的音乐,还能掌握音频工程师领域中最珍贵的技能,如插件架构、算法设计以及性能优化。
本书受到业内资深人士的高度评价,如肯·波尔曼教授(University of Miami)称赞其为“很长时间以来最重要的音频书籍之一”,认为它不仅让录音工程师们了解到插件工作的本质,还引导他们深入理解其潜在的音质特性,并培养出对音效的敏锐直觉。通过学习,读者不仅能提升自身作为音频工具使用者的素养,还有可能开发出性能更优、功能更强大的处理器。
无论是初学者还是经验丰富的开发者,'Designing Audio Effect Plugins in C++' 都是一本不可多得的指南,它提供了理论基础、实践案例和必要的软件支持,帮助读者在这个数字化音频时代的浪潮中站稳脚跟,成为音频技术领域的创新者。"
Contents xv
Chapter 12: Audio Filter Designs: Wave Digital and Virtual Analog ���������������������������������301
12.1 Wave Digital Filters .............................................................................................................. 301
12.1.1 Scattering Parameters and WDFs ............................................................................. 302
12.1.2 Simulating WDF Components .................................................................................. 303
12.1.2.1 WDF Resistor ............................................................................................. 305
12.1.2.2 WDF Inductor ............................................................................................. 305
12.1.2.3 WDF Capacitor ........................................................................................... 305
12.1.3 Simulating WDF Component Interconnections ........................................................ 306
12.2 WDF Adaptors ...................................................................................................................... 308
12.2.1 Series Adaptors ......................................................................................................... 309
12.2.2 Parallel Adaptors ....................................................................................................... 310
12.2.3 More Component Combinations ............................................................................... 311
12.2.4 Signal Flow Through a WDF Circuit ........................................................................ 313
12.2.5 Ladder Filter WDF Library Conventions.................................................................. 314
12.2.6 Filter Source/Termination Impedance Matching ...................................................... 315
12.2.7 Bilinear Transform Frequency Warping.................................................................... 316
12.3 Designing Digital Ladder Filters With the WDF Library ..................................................... 317
12.3.1 Components and Component Combinations ............................................................ 317
12.3.2 Adaptors .................................................................................................................... 317
12.3.3 WDF Ladder Filter Design: 3rd Order Butterworth LPF ......................................... 318
12.3.4 WDF Ladder Filter Design: 3rd Order Bessel BSF .................................................. 321
12.3.5 WDF Ladder Filter Design: 6th Order Constant-K BPF .......................................... 324
12.3.6 WDF Ladder Filter Design: Ideal 2nd Order RLC Filters ........................................ 325
12.4 Zavalishin’s Virtual Analog Filters ....................................................................................... 330
12.4.1 1st Order VA Filters .................................................................................................. 330
12.4.2 2nd Order State Variable VA Filter ........................................................................... 332
12.5 C++ DSP Object: ZVAFilter ................................................................................................. 336
12.5.1 ZVAFilter: Enumerations and Data Structure ........................................................... 336
12.5.2 ZVAFilter: Members ................................................................................................. 337
12.5.3 ZAFilter: Programming Notes .................................................................................. 337
12.6 C++ DSP Objects: WDF Ladder Filter Library .................................................................... 341
12.6.1 WDFIdealRLCxxx: Enumerations and Data Structure .............................................. 342
12.6.2 WDFIdealRLCxxx: Members .................................................................................... 342
12.6.3 WDFIdealRLCxxx: Programming Notes ................................................................... 342
12.7 Chapter Plugin: RLCFilters .................................................................................................. 344
12.7.1 RLCFilters: GUI Parameters ..................................................................................... 345
12.7.2 RLCFilters: Object Declarations and Reset .............................................................. 346
12.7.3 RLCFilters: GUI Parameter Update .......................................................................... 346
12.7.4 RLCFilters: Process Audio ....................................................................................... 347
12.8 Homework ............................................................................................................................ 348
12.9 Bibliography ......................................................................................................................... 350
Chapter 13: Modulators: LFOs and Envelope Detectors ��������������������������������������������������351
13.1 LFO Algorithms .................................................................................................................... 351
13.1.1 The IAudioSignalGenerator Interface ...................................................................... 353
13.1.2 C++ DSP Object: LFO .............................................................................................. 354
13.1.3 LFO: Enumerations and Data Structure .................................................................... 354
xvi Contents
13.1.4 LFO: Members .......................................................................................................... 354
13.1.5 LFO: Programming Notes ......................................................................................... 355
13.2 Envelope Detection ............................................................................................................... 357
13.2.1 C++ DSP Object: AudioDetector .............................................................................. 359
13.2.2 AudioDetector: Enumerations and Data Structure .................................................... 360
13.2.3 AudioDetector: Members .......................................................................................... 360
13.2.4 AudioDetector: Programming Notes ......................................................................... 361
13.3 Modulating Plugin Parameters ............................................................................................. 364
13.3.1 Modulation Range, Polarity, and Depth .................................................................... 364
13.3.2 Modulation With the Envelope Detector ................................................................... 365
13.4 C++ Effect Object: EnvelopeFollower ................................................................................. 367
13.4.1 EnvelopeFollower: Enumerations and Data Structure .............................................. 367
13.4.2 EnvelopeFollower: Members .................................................................................... 368
13.4.3 EnvelopeFollower: Programming Notes ................................................................... 368
13.5 Chapter Plugin 1: ModFilter ................................................................................................. 370
13.5.1 ModFilter: GUI Parameters ...................................................................................... 370
13.5.2 ModFilter: Object Declarations and Reset ................................................................ 371
13.5.3 ModFilter: GUI Parameter Update ........................................................................... 372
13.5.4 ModFilter: Process Audio ......................................................................................... 372
13.6 The Phaser Effect .................................................................................................................. 373
13.6.1 C++ Effect Object: PhaseShifter ............................................................................... 375
13.6.2 PhaseShifter: Enumerations and Data Structure ....................................................... 376
13.6.3 PhaseShifter: Members ............................................................................................. 376
13.6.4 PhaseShifter: Programming Notes ............................................................................ 377
13.7 Chapter Plugin 2: Phaser ...................................................................................................... 380
13.7.1 Phaser: GUI Parameters ........................................................................................... 380
13.7.2 Phaser: Object Declarations and Reset ..................................................................... 381
13.7.3 Phaser: GUI Parameter Update ................................................................................ 381
13.7.4 Phaser: Process Audio .............................................................................................. 382
13.8 Homework ............................................................................................................................ 382
13.9 Bibliography ......................................................................................................................... 383
Chapter 14: Delay Effects and Circular Buffers��������������������������������������������������������������384
14.1 The Basic Digital Delay ........................................................................................................ 386
14.2 Digital Delay With Wet/Dry Mix .......................................................................................... 389
14.3 An Efcient Circular Buffer Object ...................................................................................... 394
14.3.1 C++ DSP Object: CircularBuffer With Fractional Delay ......................................... 397
14.3.2 CircularBuffer: Enumerations and Data Structure .................................................... 398
14.3.3 CircularBuffer: Members .......................................................................................... 398
14.3.4 CircularBuffer: Programming Notes ......................................................................... 399
14.4 Basic Delay Algorithms ........................................................................................................ 401
14.4.1 Stereo Delay With Feedback ..................................................................................... 401
14.4.2 Stereo Ping-Pong Delay ............................................................................................ 401
14.5 C++ Effect Object: AudioDelay ............................................................................................ 403
14.5.1 AudioDelay: Enumerations and Data Structure ........................................................ 403
14.5.2 AudioDelay: Members .............................................................................................. 404
14.5.3 AudioDelay: Programming Notes ............................................................................. 405
Contents xvii
14.6 Chapter Plugin: StereoDelay ................................................................................................ 408
14.6.1 StereoDelay: GUI Parameters ................................................................................... 408
14.6.2 StereoDelay: Object Declarations and Reset ............................................................ 409
14.6.3 StereoDelay: GUI Parameter Update ........................................................................ 409
14.6.4 StereoDelay: Process Audio ...................................................................................... 410
14.6.5 Synchronizing the Delay Time to BPM .................................................................... 410
14.6.5.1 ASPiK Users: BPM and Time Signature Information ................................ 410
14.7 More Delay Algorithms ........................................................................................................ 411
14.7.1 Analog Modeling Delay ............................................................................................ 411
14.7.2 Multi-Tap Delay ........................................................................................................ 412
14.7.3 LCR Delay ................................................................................................................ 412
14.7.4 TC Electronics TC-2290 Dynamic Delay ................................................................. 412
14.8 Homework ............................................................................................................................ 414
14.9 Bibliography ......................................................................................................................... 415
Chapter 15: Modulated Delay Effects ��������������������������������������������������������������������������� 416
15.1 The Flanger/Vibrato Effect ................................................................................................... 416
15.1.1 Stereo Flanger ........................................................................................................... 418
15.2 The Chorus Effect ................................................................................................................. 419
15.2.1 Stereo Chorus ............................................................................................................ 421
15.3 C++ Effect Object: ModulatedDelay .................................................................................... 422
15.3.1 ModulatedDelay: Enumerations and Data Structure ................................................. 422
15.3.2 ModulatedDelay: Members ....................................................................................... 422
15.3.3 ModulatedDelay: Programming Notes ..................................................................... 423
15.4 Chapter Plugin: ModDelay ................................................................................................... 426
15.4.1 ModDelay: GUI Parameters ...................................................................................... 426
15.4.2 ModDelay: Object Declarations and Reset ............................................................... 427
15.4.3 ModDelay: GUI Parameter Update ........................................................................... 427
15.4.4 ModDelay: Process Audio ......................................................................................... 428
15.5 More Modulated Delay Algorithms ...................................................................................... 428
15.5.1 Korg Stereo Cross-Feedback Flanger/Chorus ........................................................... 428
15.5.2 Sony DPS-M7 Multi-Flanger .................................................................................... 428
15.5.3 Bass Chorus ............................................................................................................... 430
15.5.4 Dimension-Style Chorus (Roland Dimension D) ..................................................... 430
15.5.5 Sony DPS-M7 Deca Chorus...................................................................................... 431
15.6 Homework ............................................................................................................................ 432
15.7 Bibliography ......................................................................................................................... 433
Chapter 16: Audio Filter Designs: FIR Filters ����������������������������������������������������������������434
16.1 The Impulse Response Revisited: Convolution .................................................................... 434
16.2 FIR Filter Structures ............................................................................................................. 437
16.3 Generating Impulse Responses ............................................................................................. 439
16.3.1 Impulse Responses of Acoustic Environments ......................................................... 439
16.3.2 Impulse Responses of Speakers and Cabinets .......................................................... 439
16.3.3 Impulse Responses by Frequency Sampling ............................................................. 439
16.3.4 Sampling Arbitrary Frequency Responses ................................................................ 439
16.3.4.1 Linear Phase FIR Using the Frequency Sampling Method ........................ 441
xviii Contents
16.3.5 Sampling Analog Filter Frequency Responses ..................................................... 441
16.3.6 Sampling Ideal Filter Frequency Responses ......................................................... 442
16.4 The Optimal/Parks-McClellan Method .............................................................................. 444
16.5 Other FIR Design Methods ................................................................................................. 445
16.6 C++ DSP Function: FreqSample ........................................................................................ 446
16.7 C++ DSP Function: CalculateAnalogMagArray ................................................................ 446
16.7.1 calculateAnalogMagArray: Enumerations and Data Structure ............................ 447
16.7.2 calculateAnalogMagArray: Calculations ............................................................. 447
16.8 C++ DSP Object: LinearBuffer........................................................................................... 448
16.8.1 LinearBuffer: Enumerations and Data Structure .................................................. 448
16.8.2 LinearBuffer: Members ........................................................................................ 448
16.8.3 LinearBuffer: Programming Notes ....................................................................... 449
16.9 C++ DSP Object: ImpulseConvolver .................................................................................. 449
16.9.1 ImpulseConvolver: Enumerations and Data Structure ......................................... 449
16.9.2 ImpulseConvolver: Members ............................................................................... 449
16.9.3 ImpulseConvolver: Programming Notes .............................................................. 450
16.10 C++ Effect Object: AnalogFIRFilter .................................................................................. 451
16.10.1 AnalogFIRFilter: Enumerations and Data Structure ............................................ 452
16.10.2 AnalogFIRFilter: Members .................................................................................. 452
16.10.3 AnalogFIRFilter: Programming Notes ................................................................ 453
16.11 Chapter Plugin: AnalogFIR ................................................................................................ 454
16.11.1 AnalogFIR: GUI Parameters ................................................................................. 454
16.11.2 AnalogFIR: Object Declarations and Reset .......................................................... 455
16.11.3 AnalogFIR: GUI Parameter Update ...................................................................... 456
16.11.4 AnalogFIR: Process Audio .................................................................................... 456
16.12 Homework .......................................................................................................................... 457
16.13 Bibliography ....................................................................................................................... 457
Chapter 17: Reverb Effects ������������������������������������������������������������������������������������������458
17.1 Anatomy of a Room Impulse Response .............................................................................. 458
17.1.1 RT
60
....................................................................................................................... 460
17.2 Echoes and Modes .............................................................................................................. 460
17.3 The Comb Filter Reverberator ............................................................................................ 464
17.4 The Delaying All-Pass Reverberator .................................................................................. 468
17.4.1 Alternate and Nested Delaying APF Structures .................................................... 470
17.5 Schroeder’s Reverberator ................................................................................................... 471
17.6 The LPF-Comb Reverberator ............................................................................................. 472
17.7 The Absorbent-APF Reverberator ...................................................................................... 474
17.8 The Modulated Delay APF ................................................................................................. 474
17.9 Moorer’s Reverberator ........................................................................................................ 475
17.10 Dattorro’s Plate Reverb ....................................................................................................... 475
17.11 The Spin Semiconductor
®
Reverb Tank .............................................................................. 477
17.12 Generalized Feedback Delay Network Reverbs ................................................................. 479
17.12.1 Searching for FDN Coefcients ............................................................................ 483
17.13 C++ DSP Objects: Reverb Objects ..................................................................................... 483
17.13.1 C++ DSP Object: SimpleDelay ........................................................................... 484
Contents xix
17.13.2 SimpleDelay: Custom Data Structure ................................................................. 484
17.13.3 SimpleDelay: Members ....................................................................................... 484
17.13.4 SimpleDelay: Programming Notes ...................................................................... 485
17.13.5 C++ DSP Object: SimpleLPF ............................................................................. 486
17.13.6 SimpleLPF: Custom Data Structure .................................................................... 486
17.13.7 SimpleLPF: Members ......................................................................................... 487
17.13.8 SimpleLPF: Programming Notes ........................................................................ 487
17.13.9 C++ DSP Object: CombFilter ............................................................................. 488
17.13.10 CombFilter: Custom Data Structure ................................................................... 488
17.13.11 CombFilter: Members ......................................................................................... 488
17.13.12 CombFilter: Programming Notes ....................................................................... 488
17.13.13 C++ DSP Object: DelayAPF............................................................................... 489
17.13.14 DelayAPF: Custom Data Structure ..................................................................... 490
17.13.15 DelayAPF: Members .......................................................................................... 490
17.13.16 DelayAPFParameters: Programming Notes ....................................................... 491
17.13.17 C++ DSP Object: NestedDelayAPF .................................................................... 492
17.13.18 NestedDelayAPF: Custom Data Structure .......................................................... 492
17.13.19 NestedDelayAPF: Members ................................................................................ 493
17.13.20 NestedDelayAPF: Programming Notes .............................................................. 493
17.13.21 C++ DSP Object: TwoBandShelvingFilter ......................................................... 494
17.13.22 TwoBandShelvingFilter: Custom Data Structure ................................................ 494
17.13.23 TwoBandShelvingFilter: Members ..................................................................... 494
17.13.24 TwoBandShelvingFilter: Programming Notes .................................................... 495
17.14 C++ Effect Object: ReverbTank .......................................................................................... 496
17.14.1 ReverbTank: Enumerations and Data Structure .................................................... 498
17.14.2 ReverbTank: Members .......................................................................................... 499
17.14.3 ReverbTank: Programming Notes ......................................................................... 499
17.15 Chapter Plugin: Reverb ....................................................................................................... 504
17.15.1 Reverb: GUI Parameters ....................................................................................... 504
17.15.2 Reverb: Object Declarations and Reset ................................................................. 506
17.15.3 Reverb: GUI Parameter Update ............................................................................ 506
17.15.4 Reverb: Process Audio .......................................................................................... 507
17.16 Homework .......................................................................................................................... 508
17.17 Bibliography ....................................................................................................................... 508
Chapter 18: Dynamics Processing ���������������������������������������������������������������������������������510
18.1 Compressor Output Calculation ........................................................................................... 513
18.1.1 Hard-Knee Compressor and Limiter ....................................................................... 513
18.1.2 Soft-Knee Compressor and Limiter ........................................................................ 514
18.2 Downward Expander Output Calculation ............................................................................. 514
18.2.1 Hard-Knee Expander and Gate ............................................................................... 514
18.2.2 Soft-Knee Expander ................................................................................................ 515
18.3 Final Gain Calculation .......................................................................................................... 516
18.4 Stereo-Linked Dynamics Processor ...................................................................................... 516
18.5 Spectral Dynamics Processing .............................................................................................. 516
18.6 Parallel Dynamics Processing ............................................................................................... 518
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