Thomas Harte
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dab3580111
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Experimental: can I afford a lower sampling rate if there's a low-pass filter in effect?
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2016-08-22 22:18:05 -04:00 |
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Thomas Harte
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1541273785
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Moved responsibility for throwing in a low-pass filter up to the Vic, appropriately.
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2016-08-21 18:13:31 -04:00 |
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Thomas Harte
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c783090980
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It turns out that the Vic has a 1.6Khz low-pass filter. So added that.
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2016-08-21 12:13:41 -04:00 |
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Thomas Harte
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fef316932f
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Moved opening bracket appropriately.
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2016-07-04 21:14:28 -04:00 |
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Thomas Harte
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8db44eed3e
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Added a default implementation of Speaker::skip_samples.
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2016-07-04 20:48:27 -04:00 |
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Thomas Harte
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ed8f4d0476
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Added some minor additional bits of documentation.
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2016-06-30 08:46:29 -04:00 |
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Thomas Harte
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2bd71e7e9b
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.reset is the more normal way to reassign a unique_ptr.
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2016-06-23 20:52:44 -04:00 |
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Thomas Harte
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fcf4b14344
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Extended to allow floating-point sampling rates. Which makes sense.
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2016-06-13 19:30:41 -04:00 |
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Thomas Harte
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1e0fcbbee8
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Made a very basic stab at a couple of the tone generators, added straight-through path for the speaker when input rate exactly equals output rate.
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2016-06-01 19:53:16 -04:00 |
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Thomas Harte
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5c4f35e13f
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Finally started on generalising the C++ stuff so as to be able to be able to get a working audio binding on the OS-specific side without further repetition by factoring an appropriate protocol out from the Electron and sketching out the correct speaker class for the Atari. Added a method to ask it what a good output frequency would be.
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2016-05-31 21:23:44 -04:00 |
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Thomas Harte
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5980f5e991
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Number of taps can be specified explicitly if you desire.
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2016-04-17 20:45:57 -04:00 |
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Thomas Harte
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499f7ace07
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Re-enabled working video output for the Electron for the day and consolidated the rough metric I'm using to pick a number of taps for the audio filter.
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2016-04-17 20:43:20 -04:00 |
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Thomas Harte
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6a17c2992d
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Introduced a compile-time configurable audio divider, set it arbitrarily to '8' for now. Discovered why my graphics aren't centred and added a TODO.
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2016-04-13 22:31:59 -04:00 |
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Thomas Harte
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ca35a7e222
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Ensured that a much greater input rate than output is handled correctly.
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2016-03-16 20:38:17 -04:00 |
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Thomas Harte
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4cd0aa3416
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Completed FIR filter based audio output.
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2016-03-15 23:37:35 -04:00 |
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Thomas Harte
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726c98446a
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Fixed a couple of memory leaks, at least got as far as instantiating a filter.
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2016-03-15 21:34:00 -04:00 |
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Thomas Harte
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0efe4b312c
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Disabled my various bits of rate interchange debugging; improved test for when to call update_display due to a RAM write.
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2016-01-21 22:16:52 -05:00 |
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Thomas Harte
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e65cd4cf06
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Some data is marginally reaching the CPU from the tape.
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2016-01-19 22:05:34 -05:00 |
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Thomas Harte
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ddcc34740b
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Added lots of debugging output while I attempt to locate the source of audio scratchiness, also simplified manner of dealing with wraparound within the AudioQueue wrapper.
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2016-01-18 13:50:19 -06:00 |
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Thomas Harte
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b58e59e2bb
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Fixed: now outputting the requested output rate, rather than massively overproducing at the input rate.
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2016-01-14 23:12:40 -05:00 |
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Thomas Harte
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383b2be4c6
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Fixed one off-by-one error.
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2016-01-14 21:33:27 -05:00 |
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Thomas Harte
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8bd04a6be4
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Switched model for filter subclasses. Implemented test square[-ish] wave to check for obvious stream errors. None is clear.
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2016-01-14 21:27:02 -05:00 |
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Thomas Harte
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38ffcaa262
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Here, at last, is _some_ audio output, at least.
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2016-01-14 20:33:22 -05:00 |
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Thomas Harte
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afde8dac49
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Closed the loop such that audio manages to bubble up into Objective-C.
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2016-01-13 22:38:59 -05:00 |
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Thomas Harte
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439d452e23
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Resolved some errors.
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2016-01-13 22:11:33 -05:00 |
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Thomas Harte
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49e89a4bcb
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I'm not yet completely convinced by my approach to time basing, but it'll probably do? If so then this more or less gets me ready for a point-sampled filtering.
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2016-01-13 22:02:39 -05:00 |
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Thomas Harte
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d9a7ef9e46
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Edging towards audio output; the speaker is given appropriate input and output rates, and then updated with current divider and enabled/disabled status.
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2016-01-13 21:03:43 -05:00 |
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Thomas Harte
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84ba4e2900
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Tidied a little, started working towards supporting speaker output.
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2016-01-12 22:19:56 -05:00 |
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Thomas Harte
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3437781abd
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Started sketching out an interface for sound generation. Which made me realise that the CRT in CRTDelegate was redundant, since C++ has namespaces.
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2016-01-12 16:54:09 -05:00 |
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