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-
-
-
-
-
- Version 1.2
- 10 Apr 1991
-
- WaveMaker
- ---------
-
- W. T. Meyer
- 12 Physics
- Iowa State University
- Ames, IA 50010
-
- Introduction
- ------------
-
- Have you ever wondered how a flute and a trumpet can both play the same
- note and sound so different? The answer is that when they both play a C,
- for example, neither of them produces a sound purely at the pitch of C, but
- mixes in a lot of sounds at higher frequencies. The particular mix of these
- higher frequency sounds gives each instrument its distinctive quality.
-
- Wavemaker lets you cook up your own mixture of sound waves, see what it
- looks like, and hear what it sounds like. Using the mouse to control the
- mix and playing the keyboard like a piano, you can explore this world
- of sound.
-
- Play around with WaveMaker. What does a pure wave sound like? What kind
- of mix produces a hollow sound? What produces a harsh sound? What happens
- if you set all the waves to the same value (20 works well)?
-
- The concept of mixing waves to form a complicated waveform is an
- important one in physics. Students encounter it in acoustics, optics,
- wave motion, and quantum mechanics.
-
-
- Comments for Instructors
- ------------------------
-
- One of the important concepts in physics is understanding how sine waves
- having frequencies which are multiples of some fundamental frequency can be
- added to construct a composite waveform.
-
- WaveMaker enables the beginning student to get a feel for wave
- synthesis by providing controls for adjusting the amount of each wave to be
- used. A large visual display shows the resulting waveform and use of the
- keyboard in a "piano mode" allows the user to hear the waveform via the
- digital-to-analog converters of the Amiga's custom sound chip.
-
- WaveMaker is intended to be used "hands on" by the student, although it
- can also be very useful as a demonstration. Encourage experimentation
- and playing around - I've even included a game mode in which
- the student tries to reproduce a mystery wave created by the computer.
- WaveMaker runs on any Amiga and is fully compatible with the Amiga's
- multitasking operating system. A mouse and icon interface make it easy
- to use by students with little computer experience.
-
- If you are using WaveMaker in an academic setting at any level, I would
- appreciate a brief note or e-mail message from you telling me how you are
- using it. Suggestions for improvements are welcome.
-
-
-
- Getting Started
- ---------------
-
-
- In this discussion, the user is assumed to be familiar with the Amiga
- Workbench interface.
-
- WaveMaker is started from the Amiga Workbench in the same way as any
- other program: double-click on its icon with the mouse. When the wavemaker
- screen appears, you will see a waveform display area (initially with only a
- gray line in it) in the top half of the screen and eight sets of amplitude
- controls in the bottom half. Each of these sets has five controls and
- one numerical display. The numerical display shows the current amplitude
- as an integer between -127 and +127. The most useful control is the tall,
- thin slider. In it is a small rectangle called the knob. By dragging
- the knob up or down with the mouse, you can set the amplitude.
- The numerical display will change to show you the new setting. You can
- change the amplitude by a smaller amount (about 4 or 5 counts) by clicking
- in the open area inside the slider above or below the knob. The
- two arrow controls to the left of the slider provide very fine tuning by
- changing the amplitude by one count up or down each time you click in them.
- The fourth control is the box marked with a "+" and "-" symbol. Clicking
- here changes the sign of the amplitude, i.e. +50 becomes -50 and -75 becomes
- +75. The fifth control is a square with a gold outline. When selected,
- this becomes a solid square. Use this control to select one or more
- waves to be included in a partial sum displayed as a gold trace
- in the waveform display area. Thus you can see what an individual
- wave or group of waves is contributing to the total. It is especially
- helpful when trying to match the mystery wave in the game.
-
- Take a few minutes to play with the controls. Try each of them
- separately to see what the individual waves look like. See what happens
- when you change the sign. Now try turning on several waves at the same
- time.
-
- If the display tries to go off scale while you are changing the
- amplitudes, WaveMaker will rescale automatically, keeping the relative
- amount of each wave the same.
-
-
- The Keyboard
- ------------
-
- The keyboard can be used to hear the current waveform. The lowest two
- rows of keys have been programmed to act like a piano, with the lowest
- row being the white keys and the next row the black ones. The key lalmkfile
-
- ----------------------------------------setup.c-------
- | | C# | D# | | F# | Gsound.c| | C# |
- | | | | | guts.c | | | |
- | S | D | F | GWaveMaker.docs K | L | ; |
- -----veMaker.info-------------------------------------------
- WaveMaker.doc.info D | E | F | G | A | B | C Addwaves.c | | | | | | | | ReadMe.fnf |
- | Z | X | C | V | B | N wavemaker.c| . | / |
- ---------------------------utils.c--------------------------
-
- You can press up to fourWaveMakernce to create chords.
-
-
- Menus
- -----
-
- Menus appear when you press the right mouse button. Here are the meanings
- of theô
- 4Aï various options:
-
- PROJECT
- -------
-
- ABOUT - gives information about the program and an address
- for sending kudos, suggestions, and complaints.
- FULL SCALE - scales the current waveform to fill the display
- window.
- SCREEN TO BACK - moves the WaveMaker screen to the back of the
- Workbench, allowing access to other tasks that may
- be running.
- SCREEN TO FRONT - ««««ô
- 4¿ï moves the WaveMaker screen to the front of the Work-
- bench.
- QUIT - exits WaveMaker. This is the same as clicking on the
- "quit" button in the upper left corner of the screen.
-
- WAVEFORMS
- ---------
-
- This contains four pre-calculated waveforms to use as examples.
-
- RESET - sets all amplitudes to zero, also resets all four sound
- channels.
- TRIANGLE - creates a triangle waveform.
- SAWTOO««««ô
- 5=ïTH - creates a sawtooth waveform.
- SQUARE - creates a square waveform.
-
- GAME
- ----
-
- The computer randomly selects four or eight amplitudes (depending on
- the game mode), scales the wave to fill the display, and displays it as
- a green trace. The user then tries to match the wave using the controls.
- In the "easy" mode only the first four waves are used; in the hard mode
- all eight are used. The hard mode is a real challenge!
-
- START-EASY -
- START-HARD - star««««ô
- 5ȕt the game. This can be selected at any time. If a
- game is already in progress, the old amplitudes will be
- discarded and new ones calculated. The only difference between
- START-EASY and START-HARD is that the easy mode only uses four
- amplitudes, while the hard mode uses all eight.
- STOP - displays the answers and then exits the game mode.
-
-
- WaveMaker is freely distributable, but it cannot be sold for profit. It
- may be included ««««ôuon collections of freely distributable software sold for
- a nominal fee. Copyright is retained by the author.
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- f N®þ°`J%K
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-
- PROJECT
- -------
-
- ABOUT - gives information about the program and an address
- for sending kudos, suggestions, and complaints.
- FULL SCALE - scales the current waveform to fill the display
- window.
- SCREEN TO BACK - moves the WaveMaker screen to the back of the
- Workbench, allowing access to other tasks that may
- be running.
- SCREEN TO FRONT - moves the WaveMaker screen to the front of the Work-
- bench.
- QUIT - exits WaveMaker. This is the same as clicking on the
- "quit" button in the upper left corner of the screen.
-
- WAVEFORMS
- ---------
-
- This contains four pre-calculated waveforms to use as examples.
-
- RESET - sets all amplitudes to zero, also resets all four sound
- channels.
- TRIANGLE - creates a triangle waveform.
- SAWTOOTH - creates a sawtooth waveform.
- SQUARE - creates a square waveform.
-
- GAME
- ----
-
- The computer randomly selects four or eight amplitudes (depending on
- the game mode), scales the wave to fill the display, and displays it as
- a green trace. The user then tries to match the wave using the controls.
- In the "easy" mode only the first four waves are used; in the hard mode
- all eight are used. The hard mode is a real challenge!
-
- START-EASY -
- START-HARD - start the game. This can be selected at any time. If a
- game is already in progress, the old amplitudes will be
- discarded and new ones calculated. The only difference between
- START-EASY and START-HARD is that the easy mode only uses four
- amplitudes, while the hard mode uses all eight.
- STOP - displays the answers and then exits the game mode.
-
-
- WaveMaker is freely distributable, but it cannot be sold for profit. It
- may be included on collections of freely distributable software sold for
- a nominal fee. Copyright is retained by the author.
-