Kernel-mode audio processing modules

• US 7,528,314 B2
• Filed: 01/24/2008
• Issued: 05/05/2009
• Est. Priority Date: 04/12/2000
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Puryear, Martin G.
• Primary Examiner(s): Fletcher; Marlon T
• Application Number:
  US12/019,387
• Publication Number:
  US 20080134863A1
• Time in Patent Office: 467 Days
• Field of Search: None
• US Class Current: 84/609
• CPC Class Codes: G10H 1/0066 using a MIDI interface
• CPC Class Codes: G10H 1/183 Channel-assigning means for polyphonic instruments
• CPC Class Codes: G10H 2210/225 Portamento, i.e. smooth continuously variable pitch-bend, without emphasis of each chromatic pitch during the pitch change, which only stops at the end of the pitch shift, as obtained, e.g. by a MIDI pitch wheel or trombone pitch bend with emphasis of each chromatic pitch during pitch change, e.g. glissando, G10H2210/221
• CPC Class Codes: G10H 2210/281 Reverberation or echo
• CPC Class Codes: G10H 2240/291 SCSI, i.e. Small Computer System Interface
• CPC Class Codes: G10H 2240/295 Packet switched network, e.g. token ring circuit-switched networks, e.g. traditional analog telephone transmission G10H2240/241
• CPC Class Codes: G10H 2240/305 Internet or TCP/IP protocol use for any electrophonic musical instrument data or musical parameter transmission purposes
• CPC Class Codes: G10H 7/002 using a common processing for different operations or calculations, and a set of microinstructions (programme) to control the sequence thereof

Abstract

Multiple kernel-mode audio processing modules or filters are combined to form a module or filter graph. The graph is implemented in kernel-mode, reducing latency and jitter when handling audio data (e.g., MIDI data) by avoiding transfers of the audio data to user-mode applications for processing. A variety of different audio processing modules can be used to provide various pieces of functionality when processing audio data.

Claims

1. One or more computer-readable media having stored thereon a note offset module for modifying audio data, the note offset module including a plurality of instructions for execution in kernel-mode that, when executed in kernel-mode by one or more processors of a computer, causes the one or more processors to perform acts including:

receiving a data packet including audio data, the audio data including one or more audio notes;

identifying, based at least in part on the data packet and based at least in part on one or more parameters of the note offset module, a new audio note to replace at least one of the one or more audio notes of the data packet; and

modifying the audio data by altering at least one of the one or more audio notes by an offset value.

2. One or more computer-readable media as recited in claim 1, wherein a set of audio note to new audio note mappings for use in the identifying is received by the module via a set parameters interface.

3. One or more computer-readable media as recited in claim 1, wherein the plurality of instructions further cause the one or more processors to perform the modifying only if the data packet matches a particular one or more channels.

4. One or more computer-readable media as recited in claim 1, wherein the plurality of instructions further cause the one or more processors to perform the modifying only if the data packet matches a particular one or more channel groups.

5. One or more computer-readable media as recited in claim 4, wherein the input note to output note mapping table is received by the module via a set parameters interface.

6. One or more computer-readable media as recited in claim 4, wherein the data packet includes a data portion that identifies at least one note to be replaced.

7. A method comprising:

receiving a data packet including audio data, the audio data including one or more audio notes;

identifying, based at least in part on the data packet and based at least in part on one or more parameters of a note offset module, a new audio note to replace at least one of the one or more audio notes of the data packet; and

modifying the audio data by altering at least one of the one or more audio notes by an offset value.

8. The method as recited in claim 7, wherein a set of audio note to new audio note mappings for use in the identifying is received by the module via a set parameters interface.

9. The method as recited in claim 7, wherein modifying occurs only if the data packet matches a particular one or more channels.

10. The method as recited in claim 7, wherein modifying occurs only if the data packet matches a particular one or more channel groups.

11. One or more computer-readable media having stored thereon a note map curve module for modifying audio data, the note map curve module including a plurality of instructions for execution in kernel-mode that, when executed in kernel-mode by one or more processors of a computer, causes the one or more processors to perform acts including:

receiving a data packet including audio data, the audio data including one or more audio notes;

identifying, based at least in part on the data packet and based at least in part on an input note to output note mapping table, a new note to replace at least one of the one or more notes in the data packet; and

modifying the audio data by replacing at least one of the one or more notes with the new note.