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Patent US6384759B2 successfully refreshed from Google Patents.
US6384759B2
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Method and apparatus for sample rate pre-and post-processing to achieve maximal coding gain for transform-based audio encoding and decoding
Assignee: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung eV
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Filing: 2001-02-02
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Granted: 2002-05-07
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Expires: 2021-02-02
Abstract
Abstract The invention relates to a method and apparatus for achieving maximal coding gain for audio transmission. More particularly, at a chosen sample rate and frequency range value, an audio input signal is downsampled to the sample rate, encoded and transmitted at a given bit rate. At the receiving end, the downsampled signal is decoded and upsampled to the original or other suitable sample rate. The upsampled signal is then audibly output. Since resampling ratios using “small” numbers prove to be more computationally efficient, this method and apparatus supports resampling ratios which imply both standard and non-standard sampling ratios in the codec.
Inventors
- 👤 James H. Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:26
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/26; G10L19/02; G10L19/0212
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
67 words
A method for preparing audio signals for encoding and transmitting in a multi-media communication network, comprising: receiving an input audio signal; downsampling the input audio signal at a first communications device from an original sampling rate to a predetermined intermediate sampling rate, the downsampled signal including a resampling ratio, resampling the downsampled signal to a predetermined sampling rate , based on the resampling ratio, for subsequent output.
Claim 2
Independent Claim
67 words
A method for preparing audio signals for encoding and transmitting in a multi-media communication network, comprising: receiving an input audio signal; downsampling the input audio signal at a first communications device from an original sampling rate to a predetermined intermediate sampling rate, the downsampled signal including a resampling ratio, resampling the downsampled signal to a predetermined sampling rate , based on the resampling ratio, for subsequent output.
Claim 3
Dependent Claim
12 words
The method of claim 1 , further comprising: storing the encoded signal.
Claim 4
Dependent Claim
17 words
The method of claim 1 , wherein the audio signal is downsampled to a standard sampling rate.
Claim 5
Dependent Claim
17 words
The method of claim 1 , wherein the audio signal is downsampled to a non-standard sampling rate.
Claim 6
Dependent Claim
17 words
The method of claim 1 , wherein the audio signal is upsampled to a standard sampling rate.
Claim 7
Dependent Claim
17 words
The method of claim 1 , wherein the audio signal is upsampled to a non-standard sampling rate.
Claim 8
Dependent Claim
23 words
The method of claim 1 , further comprising determining the sampling rate and a maximum frequency range algorithmically or according to a table.
Claim 9
Dependent Claim
30 words
The method of claim 1 , wherein the transmitting includes transmitting at least one of a given bit rate, a frequency range, and a desired distortion level that is predetermined.
Claim 10
Dependent Claim
32 words
The method of claim 1 , further comprising: creating a header for the encoded signal that includes a downsampling ratio; transmitting the header with the encoded signal to the second communications device.
Claim 11
Dependent Claim
20 words
The method of claim 1 , wherein the input audio signal is downsampled by using computationally efficient integers for downsampling.
Claim 12
Dependent Claim
20 words
The method of claim 1 , wherein resampling the downsampled audio signal comprises using computationally efficient small integers for resampling.
Claim 13
Dependent Claim
16 words
The method of claim 1 , wherein the input audio signal is a baseboard input signal.
Claim 14
Dependent Claim
19 words
The method of claim 1 , wherein the downsampled signal includes side channel information that includes the resampling ratio.
Claim 15
Dependent Claim
26 words
The method of claim 1 , wherein the downsampled signal has a bit stream that includes at least one data packet that includes the resampling ratio.
Claim 16
Independent Claim
78 words
An apparatus for resampling audio signals and transmitting the audio signals in a multi-media communications network, comprising: a first terminal including a downsampler that receives an input audio signal and downsamples the input audio signal from an original sampling rate to a predetermined intermediate sampling rate, the downsampled signal including a resampling ratio; and a second terminal including a resampler that resamples the downsampled signal to a predetermined sampling rate, based on the resampling ratio, for subsequent output.
Claim 17
Independent Claim
78 words
An apparatus for resampling audio signals and transmitting the audio signals in a multi-media communications network, comprising: a first terminal including a downsampler that receives an input audio signal and downsamples the input audio signal from an original sampling rate to a predetermined intermediate sampling rate, the downsampled signal including a resampling ratio; and a second terminal including a resampler that resamples the downsampled signal to a predetermined sampling rate, based on the resampling ratio, for subsequent output.
Claim 18
Dependent Claim
15 words
The apparatus of claim 15 , further comprising: a memory for storing the encoded signal.
Claim 19
Dependent Claim
17 words
The apparatus of claim 15 , wherein the audio signal is downsampled to a standard sampling rate.
Claim 20
Dependent Claim
17 words
The apparatus of claim 15 , wherein the audio signal is downsampled to a non-standard sampling rate.
Claim 21
Dependent Claim
17 words
The apparatus of claim 15 , wherein the audio signal is upsampled to a standard sampling rate.
Claim 22
Dependent Claim
17 words
The apparatus of claim 15 , wherein the audio signal is upsampled to a non-standard sampling rate.
Claim 23
Dependent Claim
27 words
The apparatus of claim 15 , further comprising a determination device that determines the sampling rate and a maximum frequency range algorithmically or according to a table.
Claim 24
Dependent Claim
52 words
The apparatus of claim 15 , further comprising a transmitter that transmits the audio signal from the first terminal to the second terminal at a bit rate, in a frequency range, and at a distortion level, at least one of the bit rate, the frequency range, and the distortion level being fixed.
Claim 25
Dependent Claim
29 words
The apparatus of claim 15 , further comprising an encoder that creates a header for the downsampled signal, and a transmitter that transmits the header with the downsampled signal.
Claim 26
Dependent Claim
16 words
The apparatus of claim 15 , wherein the downsampler uses computationally efficient small integers for downsampling.
Claim 27
Dependent Claim
16 words
The apparatus of claim 15 , wherein the resampler uses computationally efficient small integers for resampling.
Claim 28
Dependent Claim
16 words
The apparatus of claim 15 , wherein the input audio signal is a baseboard input signal.
Claim 29
Dependent Claim
19 words
The apparatus of claim 15 , wherein the downsampled signal includes side channel information that includes the resampling ratio.
Claim 30
Dependent Claim
26 words
The apparatus of claim 15 , wherein the downsampled signal includes a bit stream that includes at least one data package that includes the resampling ratio.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-05-06 | 2005-11-05 | 2006-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-05-06 | 2009-11-05 | 2010-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-05-06 | 2013-11-05 | 2014-05-07 | $7700.00 | Window Closed / Lapsed |