WO1996032805A1 - Method and apparatus for transmitting coded audio signals through a transmission channel with limited bandwidth - Google Patents
Method and apparatus for transmitting coded audio signals through a transmission channel with limited bandwidth Download PDFInfo
- Publication number
- WO1996032805A1 WO1996032805A1 PCT/US1996/004835 US9604835W WO9632805A1 WO 1996032805 A1 WO1996032805 A1 WO 1996032805A1 US 9604835 W US9604835 W US 9604835W WO 9632805 A1 WO9632805 A1 WO 9632805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- audio
- digital
- analog
- decoder
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0421—Circuit arrangements therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/005—Details of transducers, loudspeakers or microphones using digitally weighted transducing elements
Definitions
- An object of the present invention is to provide for the transmission of high quality wideband speech over existing telephone networks.
- a further object of the present invention is to provide for the transmission of high quality audio signals in the range of 20 Hz to at least 5,500 Hz over existing telephone networks.
- a still further object of the present invention is to accomplish data compression on wideband speech signals to produce a transmission rate of 28.8 kbit/s or less without significant loss of audio quality.
- Fig. 4 is a detailed circuit diagram of the audio input portion of Fig. 3.
- Fig. 5 is a detailed circuit diagram of the level
- the combined analog signal from the analog mixer 20 is sent to the encoder 32 where the analog signal is first converted to a digital signal.
- the sampling rate used for the analog to digital conversion is preferably ultimately be transmitted to the second CODEC 14 (shown in Fig. 1).
- the digital signal is then compressed using a modified version of the ISO/MPEG algorithm.
- the ISO/MPEG compression algorithm is modified to produce a transmission rate of 28.8 kbit/s. This is accomplished by the software routine that is disclosed in the software appendix.
- the compressed and error protected digital signal is then sent to an analog modem 36 where the digital signal is converted back to an analog signal for transmitting. As shown in Fig. 1, this analog signal is sent via a standard copper telephone line 16 through a telephone network 17 to the second CODEC 14.
- the analog modem 36 is preferably a V.34 synchronous modem. This type of modem is commercially available.
- the CODEC 12 includes a control processor 48 for controlling the various functions of the CODEC 12 according to software routines stored in memory 50. A more detailed description of the structure of the control processor appears below with respect to Figs. 7, 8, 9, 10, and 11.
- One software routine executed by the control processor allows the user of the CODEC 12 to initiate calls and enter data such as phone numbers. When a call is initiated the control processor sends a signal including the phone number to be dialed to the analog modem 36. Data entry is accomplished via a keypad 52 and the entered data may be monitored by observation of an LCD 54.
- the keypad 52 also includes keys for selecting various modes of operation of the CODEC 12.
- the audio input signal 310 is fed into the record monitor level control 324, where its level is adjusted before being mixed with the audio output signal 336 from the digital /analog converter 442 (shown in Fig. 16 and 20) .
- the audio output signal 336 is fed to the local monitor level control 326 before it is fed into the headphone mixer amplifier 334.
- the resulting output signal from the headphone mixer amplifier 334 goes to a headphone output connector 338 on the exterior of the CODEC 12 where a pair of headphones may be connected.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Telephonic Communication Services (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Telephone Function (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU53880/96A AU5388096A (en) | 1995-04-10 | 1996-04-10 | Method and apparatus for transmitting coded audio signals th rough a transmission channel with limited bandwidth |
EP96910781A EP0870394A4 (en) | 1995-04-10 | 1996-04-10 | Method and apparatus for transmitting coded audio signals through a transmission channel with limited bandwidth |
BR9609866-0A BR9609866A (en) | 1995-04-10 | 1996-04-10 | Method and apparatus for transmitting encoded audio signals over a transmission channel with limited bandwidth |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/419,199 US5706335A (en) | 1995-04-10 | 1995-04-10 | Method and appartus for transmitting coded audio signals through a transmission channel with limited bandwidth |
US08/419,199 | 1995-04-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1996032805A1 true WO1996032805A1 (en) | 1996-10-17 |
WO1996032805A9 WO1996032805A9 (en) | 1996-11-28 |
Family
ID=23661220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/004835 WO1996032805A1 (en) | 1995-04-10 | 1996-04-10 | Method and apparatus for transmitting coded audio signals through a transmission channel with limited bandwidth |
Country Status (5)
Country | Link |
---|---|
US (3) | US5706335A (en) |
EP (1) | EP0870394A4 (en) |
AU (1) | AU5388096A (en) |
BR (1) | BR9609866A (en) |
WO (1) | WO1996032805A1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4111131C2 (en) * | 1991-04-06 | 2001-08-23 | Inst Rundfunktechnik Gmbh | Method of transmitting digitized audio signals |
US6700958B2 (en) * | 1995-04-10 | 2004-03-02 | Starguide Digital Networks, Inc. | Method and apparatus for transmitting coded audio signals through a transmission channel with limited bandwidth |
US5706335A (en) | 1995-04-10 | 1998-01-06 | Corporate Computer Systems | Method and appartus for transmitting coded audio signals through a transmission channel with limited bandwidth |
US6301555B2 (en) * | 1995-04-10 | 2001-10-09 | Corporate Computer Systems | Adjustable psycho-acoustic parameters |
EP0845176A4 (en) * | 1995-08-16 | 2001-09-12 | Starguide Digital Networks Inc | Dynamic allocation of bandwidth for transmission of audio signals and a video signal |
AU720245B2 (en) * | 1995-09-01 | 2000-05-25 | Starguide Digital Networks, Inc. | Audio file distribution and production system |
US5881317A (en) * | 1996-09-30 | 1999-03-09 | Intel Corporation | Adaptive operation of audio peripherals based on the functionality of analog audio interface |
WO1998015887A2 (en) * | 1996-10-09 | 1998-04-16 | Starguide Digital Networks | Aggregate information production and display system |
US6101180A (en) | 1996-11-12 | 2000-08-08 | Starguide Digital Networks, Inc. | High bandwidth broadcast system having localized multicast access to broadcast content |
US7194757B1 (en) | 1998-03-06 | 2007-03-20 | Starguide Digital Network, Inc. | Method and apparatus for push and pull distribution of multimedia |
US8284774B2 (en) * | 1998-04-03 | 2012-10-09 | Megawave Audio Llc | Ethernet digital storage (EDS) card and satellite transmission system |
US6160797A (en) * | 1998-04-03 | 2000-12-12 | Starguide Digital Networks, Inc. | Satellite receiver/router, system, and method of use |
US6219730B1 (en) * | 1998-06-20 | 2001-04-17 | Nghi Nho Nguyen | Method and apparatus for producing a combined data stream and recovering therefrom the respective user input stream and at least one additional input signal |
US6226618B1 (en) * | 1998-08-13 | 2001-05-01 | International Business Machines Corporation | Electronic content delivery system |
US6311161B1 (en) * | 1999-03-22 | 2001-10-30 | International Business Machines Corporation | System and method for merging multiple audio streams |
TW452956B (en) | 2000-01-04 | 2001-09-01 | Siliconware Precision Industries Co Ltd | Heat dissipation structure of BGA semiconductor package |
US6754295B1 (en) | 2000-04-07 | 2004-06-22 | Comrex Corporation | Method and apparatus for synchronizing data transmission and reception over a network |
WO2002069073A2 (en) * | 2000-11-13 | 2002-09-06 | Starguide Digital Networks, Inc. | Ethernet digital storage (eds) card and satellite transmission system including faxing capability |
US6694474B2 (en) * | 2001-03-22 | 2004-02-17 | Agere Systems Inc. | Channel coding with unequal error protection for multi-mode source coded information |
EP1433166B8 (en) * | 2001-09-28 | 2008-01-02 | Nokia Siemens Networks Gmbh & Co. Kg | Speech extender and method for estimating a broadband speech signal from a narrowband speech signal |
JP2004272563A (en) * | 2003-03-07 | 2004-09-30 | Fujitsu Ltd | Communication control program, content distribution program, terminal equipment, and content server |
US20080294446A1 (en) * | 2007-05-22 | 2008-11-27 | Linfeng Guo | Layer based scalable multimedia datastream compression |
US8265099B2 (en) * | 2008-12-22 | 2012-09-11 | Gn Resound A/S | Error correction scheme in a hearing system wireless network |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5325423A (en) * | 1992-11-13 | 1994-06-28 | Multimedia Systems Corporation | Interactive multimedia communication system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3639753A1 (en) * | 1986-11-21 | 1988-06-01 | Inst Rundfunktechnik Gmbh | METHOD FOR TRANSMITTING DIGITALIZED SOUND SIGNALS |
NL8901032A (en) * | 1988-11-10 | 1990-06-01 | Philips Nv | CODER FOR INCLUDING ADDITIONAL INFORMATION IN A DIGITAL AUDIO SIGNAL WITH A PREFERRED FORMAT, A DECODER FOR DERIVING THIS ADDITIONAL INFORMATION FROM THIS DIGITAL SIGNAL, AN APPARATUS FOR RECORDING A DIGITAL SIGNAL ON A CODE OF RECORD. OBTAINED A RECORD CARRIER WITH THIS DEVICE. |
US5389965A (en) * | 1993-04-01 | 1995-02-14 | At&T Corp. | Video telephone station having variable image clarity |
US5706335A (en) * | 1995-04-10 | 1998-01-06 | Corporate Computer Systems | Method and appartus for transmitting coded audio signals through a transmission channel with limited bandwidth |
-
1995
- 1995-04-10 US US08/419,199 patent/US5706335A/en not_active Expired - Lifetime
-
1996
- 1996-04-10 WO PCT/US1996/004835 patent/WO1996032805A1/en not_active Application Discontinuation
- 1996-04-10 EP EP96910781A patent/EP0870394A4/en not_active Withdrawn
- 1996-04-10 AU AU53880/96A patent/AU5388096A/en not_active Abandoned
- 1996-04-10 BR BR9609866-0A patent/BR9609866A/en unknown
-
1997
- 1997-12-11 US US08/988,709 patent/US6128374A/en not_active Expired - Lifetime
-
2000
- 2000-06-16 US US09/595,521 patent/US6373927B1/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5325423A (en) * | 1992-11-13 | 1994-06-28 | Multimedia Systems Corporation | Interactive multimedia communication system |
Non-Patent Citations (1)
Title |
---|
See also references of EP0870394A4 * |
Also Published As
Publication number | Publication date |
---|---|
AU5388096A (en) | 1996-10-30 |
EP0870394A1 (en) | 1998-10-14 |
US6373927B1 (en) | 2002-04-16 |
EP0870394A4 (en) | 2001-07-11 |
BR9609866A (en) | 2001-10-23 |
US6128374A (en) | 2000-10-03 |
US5706335A (en) | 1998-01-06 |
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