EP1095538A2 - Audio peripheral device comprising usb interface and digital audio mixer - Google Patents

Audio peripheral device comprising usb interface and digital audio mixer

Info

Publication number
EP1095538A2
EP1095538A2 EP00914164A EP00914164A EP1095538A2 EP 1095538 A2 EP1095538 A2 EP 1095538A2 EP 00914164 A EP00914164 A EP 00914164A EP 00914164 A EP00914164 A EP 00914164A EP 1095538 A2 EP1095538 A2 EP 1095538A2
Authority
EP
European Patent Office
Prior art keywords
signal
audio
peripheral device
pcm stream
encoded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00914164A
Other languages
German (de)
French (fr)
Inventor
Frank C. H. Daems
Wim J. A. Vanspringel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP00914164A priority Critical patent/EP1095538A2/en
Publication of EP1095538A2 publication Critical patent/EP1095538A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]

Definitions

  • the invention relates to an audio peripheral device comprising an USB interface.
  • the invention further relates to a method for supplying a digital audio signal.
  • USB universal serial bus
  • USB Universal Serial Bus
  • Such audio peripheral devices are known in the art.
  • a disadvantage of the known audio peripheral devices is that it is difficult to mix a stereo PCM stream with an encoded (audio) signal as received from the USB bus.
  • an object of the invention is to overcome the disadvantages of the prior art.
  • a first aspect of the invention provides an USB audio peripheral device as claimed in claim 1.
  • a second aspect of the invention provides a method for supplying a digital audio signal as claimed in claim.
  • sample rate converter makes it possible to synchronize the PCM stream to the encoded audio stream.
  • the figure a block schematic example of an USB audio peripheral device
  • An input I is coupled to an USB bus USB for receiving a signal from the bus.
  • the input I is coupled to an USB interface l.
  • the USB interface supplies in this example two signals, that is a first signal SI being a stereo PCM stream and a second signal S2 being an encoded audio stream.
  • the signal SI is supplied to a sample rate converter 3 for amending the sample rate of this signal into a signal SI', to synchronize this signal with signal S2.
  • the signal S2 is supplied to a decoder 5 for decoding the encoded audio stream into a signal S2'.
  • the converted signal SI' and the decoded signal S2' are supplied to inputs of a mixer 7 for mixing these signals into an output signal So to be supplied at an output O.
  • the output can be coupled to loudspeakers for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Information Transfer Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

An audio peripheral device comprising a USB interface is used to couple for example a computer with loudspeakers. An existing problem of known audio peripheral devices is that it is difficult to mix a stereo PCM stream with an encoded (audio) signal as received from the USB bus. The invention provides a solution for this problem by adding a sample rate converter before mixing the different signals.

Description

Audio peripheral device
The invention relates to an audio peripheral device comprising an USB interface.
The invention further relates to a method for supplying a digital audio signal.
USB (universal serial bus) has been developed by the PC industry for interfacing I/O peripherals to a main system for example a personal computer with loudspeakers.
For further information on the USB standard, see Universal Serial Bus, version xx, published by Intel Corporation, Santa Clara, California, USA.
Such audio peripheral devices are known in the art.
A disadvantage of the known audio peripheral devices is that it is difficult to mix a stereo PCM stream with an encoded (audio) signal as received from the USB bus.
It is inter alia an object of the invention is to overcome the disadvantages of the prior art.
To this end a first aspect of the invention provides an USB audio peripheral device as claimed in claim 1. A second aspect of the invention provides a method for supplying a digital audio signal as claimed in claim.
In order to be able to mix this information digitally, a sample rate converter is necessary. Both streams are not synchronized. The sample rate converter makes it possible to synchronize the PCM stream to the encoded audio stream.
In this way it is possible to combine a stereo PCM signal with an encoded signal such as AC3, MPEG2 et al.
Embodiments of a device according to the invention are described in the dependent claims. The invention and additional features, which may be optionally, be used to implement the invention to advantage, will be apparent from and elucidated with references to the examples described below hereinafter and shown in the figure. Herein shows:
The figure a block schematic example of an USB audio peripheral device,
In the figure a block schematic example of an USB audio peripheral device D according to the invention is shown.
An input I is coupled to an USB bus USB for receiving a signal from the bus. The input I is coupled to an USB interface l.The USB interface supplies in this example two signals, that is a first signal SI being a stereo PCM stream and a second signal S2 being an encoded audio stream.
The signal SI is supplied to a sample rate converter 3 for amending the sample rate of this signal into a signal SI', to synchronize this signal with signal S2.
The signal S2 is supplied to a decoder 5 for decoding the encoded audio stream into a signal S2'.
The converted signal SI' and the decoded signal S2' are supplied to inputs of a mixer 7 for mixing these signals into an output signal So to be supplied at an output O. the output can be coupled to loudspeakers for example.
It is to be noticed that above an audio peripheral device according to the invention has been described on the basis of an example. The man skilled in the art will be well aware of a lot of variations, which fall within the scope of the invention.

Claims

CLAIMS:
1. Audio peripheral device comprising an USB interface for receiving a signal from a USB bus and for supplying a first signal being a PCM stream signal and a second signal being an encoded signal, decoding means for decoding the encoded signal, sample rate conversion means for converting the sample rate of the PCM stream signal and mixing means for mixing the decoded signal and the converted PCM stream signal, and output means for supplying a digital audio output signal.
2. Audio peripheral device according to claim 1, characterized in that the received signal from the USB bus also comprises control parameters for controlling the mixing of the decoded signal and the converted PCM stream signal.
3. Audio peripheral device according to claim 1, characterized in that the mixing means are digital mixing means.
4. Method for supplying a digital audio signal receiving a signal from a USB bus, comprising a first signal being a PCM stream signal and a second signal being an encoded signal, decoding the encoded signal, converting the PCM stream signal and mixing the decoded signal and the converted PCM stream signal and supplying the digital audio signal.
EP00914164A 1999-04-06 2000-03-21 Audio peripheral device comprising usb interface and digital audio mixer Withdrawn EP1095538A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00914164A EP1095538A2 (en) 1999-04-06 2000-03-21 Audio peripheral device comprising usb interface and digital audio mixer

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99201035 1999-04-06
EP99201035 1999-04-06
PCT/EP2000/002575 WO2000060901A2 (en) 1999-04-06 2000-03-21 Audio peripheral device comprising usb interface and digital audio mixer
EP00914164A EP1095538A2 (en) 1999-04-06 2000-03-21 Audio peripheral device comprising usb interface and digital audio mixer

Publications (1)

Publication Number Publication Date
EP1095538A2 true EP1095538A2 (en) 2001-05-02

Family

ID=8240059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00914164A Withdrawn EP1095538A2 (en) 1999-04-06 2000-03-21 Audio peripheral device comprising usb interface and digital audio mixer

Country Status (5)

Country Link
EP (1) EP1095538A2 (en)
JP (1) JP2002541572A (en)
KR (1) KR20010052623A (en)
CN (1) CN1304597A (en)
WO (1) WO2000060901A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2889898B1 (en) * 2005-08-18 2008-02-22 Dolphin Integration Sa ANALOGUE AND DIGITAL SIGNAL MIXER
WO2011091171A1 (en) 2010-01-20 2011-07-28 Ikingdom Corp. Midi communication hub
US9524141B2 (en) 2012-12-21 2016-12-20 Ikingdom Corp. System and method for audio pass-through that has at least two USB ports between multiple host computing devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5647008A (en) * 1995-02-22 1997-07-08 Aztech Systems Ltd. Method and apparatus for digital mixing of audio signals in multimedia platforms
JPH11150788A (en) * 1997-11-14 1999-06-02 Yamaha Corp Audio system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0060901A2 *

Also Published As

Publication number Publication date
WO2000060901A3 (en) 2001-01-25
CN1304597A (en) 2001-07-18
KR20010052623A (en) 2001-06-25
WO2000060901A2 (en) 2000-10-12
JP2002541572A (en) 2002-12-03

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