Audio techniques for music content generation
Techniques are disclosed relating to implementing audio techniques for real-time audio generation. For example, a music generator system may generate new music content from playback music content based on different parameter representations of an audio signal. In some cases, an audio signal can be represented by both a graph of the signal (e.g., an audio signal graph) relative to time and a graph of the signal relative to beats (e.g., a signal graph). The signal graph is invariant to tempo, which allows for tempo invariant modification of audio parameters of the music content in addition to tempo variant modifications based on the audio signal graph.
1. A method, comprising:
accessing, by a computer system, a first graph of an audio signal, wherein the first graph is a graph of audio parameters relative to time;
accessing, by the computer system, a second graph of the audio signal, wherein the second graph is a signal graph of the audio parameters relative to beat;
accessing, by the computer system, playback music content; and
modifying, by the computer system, the audio parameters in the playback music content to generate new music content, wherein the audio parameters are modified based on a combination of the first graph and the second graph.
2. The method of claim 1 , wherein the first graph and the second graph are accessed from a cloud-based server.
3. The method of claim 1 , wherein the audio parameters in the first graph and the second graph are defined by nodes in the graphs that determine changes in properties of the audio signal.
4. The method of claim 3 , wherein modifying the audio parameters in the playback music content to generate the new music content includes:
determining a first node in the first graph corresponding to an audio signal in the playback music content;
determining a second node in the second graph that corresponds to the first node;
determining one or more specified audio parameters based on the second node; and
modifying one or more properties of an audio signal in the playback music content by modifying the specified audio parameters.
5. The method of claim 4 , further comprising:
determining one or more additional specified audio parameters based on the first node; and
modifying one or more properties of an additional audio signal in the playback music content by modifying the additional specified audio parameters.
6. The method of claim 4 , wherein determining the one or more specified audio parameters includes:
determining a portion of the second graph to implement for the audio parameters based on a position of the second node in the second graph; and
selecting the audio parameters from the determined portion of the second graph as the one or more specified audio parameters.
7. The method of claim 6 , wherein modifying the one or more specified audio parameters modifies a portion of the playback music content that corresponds to the determined portion of the second graph.
8. The method of claim 4 , wherein the modified properties of the audio signal in the playback music content include signal amplitude, signal frequency, or a combination thereof.
9. The method of claim 1 , further comprising applying one or more automations to the audio parameters, wherein at least one of the automations is a pre-programmed temporal manipulation of at least one of the audio parameters.
10. The method of claim 9 , further comprising applying one or more modulations to the audio parameters, wherein at least one of the modulations modifies at least one of the audio parameters multiplicatively on top of at least one automation.
11. The method of claim 1 , wherein the first graph is a tempo variant graph of the audio signal.
12. The method of claim 1 , wherein the second graph is a tempo invariant graph of the audio signal.
13. A non-transitory computer-readable medium having instructions stored thereon that are executable by a computing device to perform operations comprising:
accessing a first graph of an audio signal, wherein the first graph is a graph of audio parameters relative to time;
accessing a second graph of the audio signal, wherein the second graph is a signal graph of the audio parameters relative to beat;
accessing playback music content; and
modifying the audio parameters in the playback music content to generate new music content, wherein the audio parameters are modified based on a combination of the first graph and the second graph.
14. The non-transitory computer-readable medium of claim 13 , wherein the audio parameters in the first graph and the second graph are defined by nodes in the graphs that determine changes in properties of the audio signal, and wherein modifying the audio parameters in the playback music content to generate the new music content includes:
determining a first node in the first graph corresponding to an audio signal in the playback music content;
determining a second node in the second graph that corresponds to the first node;
determining one or more specified audio parameters based on the second node; and
modifying one or more properties of an audio signal in the playback music content by modifying the specified audio parameters.
15. The non-transitory computer-readable medium of claim 14 , wherein the modified properties of the audio signal in the playback music content include signal amplitude, signal frequency, or a combination thereof.
16. The non-transitory computer-readable medium of claim 13 , wherein at least one of: the audio signal, the first graph, and the second graph are access as one or more objects associated with a set of music content stored in a heap allocated memory.
17. The non-transitory computer-readable medium of claim 13 , further comprising adding an identifier to the new music content, and storing the new music content in at least one circular buffer in a static array of circular buffers.
18. The non-transitory computer-readable medium of claim 17 , wherein the static array of circular buffers is accessible by a single user.
19. An apparatus, comprising:
one or more processors; and
one or more memories having program instructions stored thereon that are executable by the one or more processors to:
access a first graph of an audio signal, wherein the first graph is a graph of audio parameters relative to time;
access a second graph of the audio signal, wherein the second graph is a signal graph of the audio parameters relative to beat;
access playback music content; and
modify the audio parameters in the playback music content to generate new music content, wherein the audio parameters are modified based on a combination of the first graph and the second graph.
20. The apparatus of claim 19 , further comprising a static array of circular buffers, wherein the program instructions stored on the one or more memories are executable by the one or more processors to store the new music content in at least one circular buffer in the static array of circular buffers.