Tree @lintian-fixes/main (Download .tar.gz)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | blepvco 0.1.0 ============= blepvco is a LADSPA plugin library containing three anti-aliased, minBLEP-based, hard-sync-capable oscillator plugins. The oscillators are intended to be used with modular synthesis systems, such as Alsa Modular Synth. Users of Fons Adriaensen's VCO-plugins will find these plugins immediately familiar, since they borrow much of their interface code from Fons' work -- indeed, if/when you do not need the hard-sync or variable-slope triangle wave features of blepvco, his plugins may be a better choice, because their CPU use is somewhat lower. Currently, his VCO-plugins can be found at: http://users.skynet.be/solaris/linuxaudio/ blepvco is written by Sean Bolton, and copyright (c)2005 under the GNU General Public License, version 2 or later. See the enclosed file COPYING for details. While this software is `free' within the requirements of this license, I (Sean) would appreciate any or all of the following should you find blepvco useful: - an email stating where you're from and how you're using the blepvco plugins, sent to <musound /at/ jps /dot/ net>. - copies of or links to music you've created with them. - suggestions for improving the blepvco plugins or packaging. blepvco is indirectly the result of cumulative effort by a number of contributors, see the AUTHORS file for details. Introduction ============ The three oscillator plugins in blepvco use pre-integrated, minimum-phase, bandwidth-limited pulses (`minBLEPs') to construct anti-aliased waveforms. They are capable of `hard sync', where a slave oscillator will reset its phase whenever the master oscillator begins a new cycle, producing a distinctive sound. The three oscillators are: Sync-Saw-VCO : Anti-aliased sawtooth oscillator with hard-sync capability Sync-Rect-VCO : Anti-aliased variable-width rectangle oscillator, with sync Sync-Tri-VCO : Anti-aliased variable-slope triangle oscillator, with sync Each of these oscillators have `Sync Out' and `Sync In' ports, which generate and accept a special signal used for synchronization. Connect the `Sync Out' of the master oscillator to the `Sync In' of the slave to enable synchronization. Note that the sync signal may appear in your application to be an audio signal, but is actually a stream of phase offsets, and is therefore not compatible with other audio ports. In particular, don't expect these oscillators to sync properly to any source other than a `Sync Out' from another one of these oscillators. The sync signal may be chained (e.g. master -> slave1 -> slave2), but for anti-aliased operation, the frequencies of the upstream (master and slave1) oscillators must be such that no two would ever both reset during the same audio frame. The other ports of plugins are: `Output' - the audio output port `Frequency' - audio-rate frequency input, one-float-per-octave (e.g. adding 1.0 to this signal doubles the frequency) `Octave' and `Tune' - frequency control inputs, also one-float-per- octave. `Exp FM' and `Exp FM gain' - yet more one-float-per-octave frequency control inputs, but here the audio-rate `Exp FM' signal is multiplied by the control input `Exp FM gain' before being summed with the other frequency inputs. `Lin FM' and `Lin FM gain' - got enough inputs to control the frequency yet? Here, the product of the audio-rate `Lin FM' and the control input `Lin FM gain' applies a linear, one-float- per-kilohertz adjustment to the frequency. `Waveform', `Wave Mod', and `WMod gain' - present only in the rectangular and triangle wave plugins, these inputs control the duty cycle of the output waveform. A `Waveform' control input of -1.0 produces the shorted possible `high' portion of the rectangular wave, and the shorted-possible positive-slope portion of the triangle wave (i.e. it becomes a descending sawtooth), while an input of 1.0 produces the longest 'high' or positive-slope portion. The audio-rate `Wave Mod' input is multiplied by the control input `WMod gain' and used to modulate the duty cycle. `LP filter' - the raw output of these plugins can be pretty bright (and I suspect the minimum-phase filtering of the BLEP impulses leads to some phase-reinforcement under certain conditions that makes them even brighter), so I've retained the low-pass filter Fons used in his VCO-plugins. A `LP filter' control input value of 0.0 provides the maximum high-frequency attenuation, while a value of 1.0 effectively disables the filter. Installation ============ On most POSIX-ish systems with the LADSPA SDK installed, doing: $ make follow by (as root): $ make install will build and install the blepvco shared object library as /usr/lib/ladspa/blepvco.so. You may wish to tweak a few things in the Makefile first: - add the directory where your ladspa.h is found to CPPFLAGS, if ladspa.h is not in your compiler's default include path (e.g. `CPPFLAGS += -I. -I/opt/audio/include -fPIC -D_REENTRANT -Wall -O3') - change the destination directory for the install `cp', if you don't want it installed in /usr/lib/ladspa. Extras ====== In the extras/ directory, you will find: ams_sync_simple_example.ams ams_sync_example_2.ams - example patch files for Alsa Modular Synth, showing possible uses of blepvco oscillators. (Created with AMS 1.8.4) minblep.c - Daniel Werner's minBLEP generation code, with a couple bug fixes, adapted to use FFTW, and changed to generate impulses which are the difference between the minimum-phase, band- limited step or slope-change impulses, and their `ideal' or `naive' forms. This is not required to build blepvco -- it's only there for the curious, or for those who might want to alter the impulse parameters. |
Commit History @lintian-fixes/main
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- d/control: Deprecating priority extra as per policy 4.0.1 Ondřej Nový 6 years ago
- Finalize. Alessio Treglia 12 years ago
- Remove myself from the uploaders list. Alessio Treglia 12 years ago
- Add gbp config file. Alessio Treglia 12 years ago
- Switch packaging to 3.0 (quilt) format. Alessio Treglia 12 years ago
- Bump Standards. Alessio Treglia 12 years ago
- Remove DM-Upload-Allowed: yes, now unnecessary. Alessio Treglia 13 years ago
- Change my email address. Alessio Treglia 13 years ago
- Imported Debian patch 0.1.0-2 Alessio Treglia 14 years ago
- Imported Upstream version 0.1.0 Alessio Treglia 14 years ago
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