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EP0425964A2
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EP
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Asynchronous voice reconstruction for a digital communication system
Assignee: Motorola Solutions Inc
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Filing: 1990-10-22
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Granted: —
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Expires: 2010-10-22
Abstract
Abstract A method and means of performing the asynchronous reconstruction of a digital data stream is disclosed. An input data stream having an input rate, such as digitized speech, is stored in a circular buffer (250). Within the buffer (250), read and write marker positions (300 and 301) are determined. Upon subsequent retrieval of the data stream at an output rate, data is taken from the position of the read marker (301) each time data is written to the position of the write marker (300). Of importance, the read and write marker positions (300 and 301) are determined such that they provide a delay (A) greater than the difference between the input rate and the output rate over the length of the buffer (250). The data stream processing is then modified by ignoring at least some of the data stream when the input rate is faster than the output rate, and repeating at least some of the data stream when the input rate is slower than the output rate. In this manner a method of digitized voice reconstruction without reliance upon network synchronization is achieved.
Inventors
- 👤 Gregory J. Bedlek
- 👤 Richard E. White
- 👤 Thomas A. Freeburg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:45
CPC Classifications
G; G06; G06F; G06F5/00; G06F5/06; G06F5/10; H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/062; H04J3/0626; H04L; H04L25/00; H04L25/02; H04L25/05; G06F2205/00; G06F2205/06; G06F2205/062; G06F2205/10; G06F2205/104
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
67 words
In a communications system (100), a method of performing the asynchronous reconstruction of a digital data stream characterized by the steps of: storing an input data stream at an input rate; retrieving the stored data stream at an output rate; and modifying the processing of at least a portion of the data stream as a function of the difference between the input rate and the output rate.
Claim 2
Dependent Claim
67 words
In a communications system (100), a method of performing the asynchronous reconstruction of a digital data stream characterized by the steps of: storing an input data stream at an input rate; retrieving the stored data stream at an output rate; and modifying the processing of at least a portion of the data stream as a function of the difference between the input rate and the output rate.
Claim 3
Dependent Claim
58 words
The method of claim 1, wherein the step of modifying the processing of the data stream further comprises the steps of: ignoring at least some of the data stream when the input rate is faster than the output rate; and repeating at least some of the data stream when the input rate is slower than the output rate.
Claim 4
Dependent Claim
90 words
A data receiver (120) capable of asynchronously reconstructing a digital data stream into an analog representation comprising: storing means (250) for accepting an input data stream at an input rate; and retrieving means (254) connected to the storing means for accessing the stored data at an output rate; wherein the improvement is characterized by: altering means (300, 301, 302 and 303) operably coupled to the retrieving means (254) for modifying the processing of the data stream as a function of the difference between the input rate and the output rate.
Claim 5
Dependent Claim
90 words
A data receiver (120) capable of asynchronously reconstructing a digital data stream into an analog representation comprising: storing means (250) for accepting an input data stream at an input rate; and retrieving means (254) connected to the storing means for accessing the stored data at an output rate; wherein the improvement is characterized by: altering means (300, 301, 302 and 303) operably coupled to the retrieving means (254) for modifying the processing of the data stream as a function of the difference between the input rate and the output rate.
Claim 6
Dependent Claim
73 words
The data receiver (120) of claim 3, wherein the altering means (300, 301, 302 and 303) for modifying the processing of the data stream further comprises: means (300 and 301) for ignoring at least some of the stored stream when the input rate is faster than the output rate; and means (300 and 301) for repeating at least some of the stored stream when the input rate is slower than the output rate.
Claim 7
Dependent Claim
15 words
The data receiver (120) of claim 3, wherein the input data stream is digitized speech.
Claim 8
Dependent Claim
26 words
The data receiver (120) of claim 3, wherein the storing means comprises a circular buffer (250) having a read pointer (303) and a write pointer (302).
Claim 9
Dependent Claim
26 words
The data receiver (120) of claim 6, wherein the circular buffer (250) has a predetermined read marker location (301) and a predetermined write marker location (300)
Claim 10
Dependent Claim
20 words
The data receiver (120) of claim 3, further including postponing means (A) for delaying the retrieval of the stored stream..
Claim 11
Dependent Claim
42 words
The data receiver (120) of claim 3, wherein the read marker location (301) and the write marker location (300) are determined as a function of the difference between the input rate and the output rate over the time to fill the buffer.
Claim 12
Dependent Claim
16 words
The data receiver (120) of claim 3, wherein the retrieving means (254) is a digital-to-analog converter.
Claim 13
Independent Claim
126 words
A method of performing the asynchronous reconstruction of digital speech into an analog representation comprising the steps of: storing an input data stream in a buffer (250) at an input rate wherein the improvement is characterized by: establishing a read marker location (301) within the buffer (250); establishing a write marker location (300) within the buffer (250); initiating data stream retrieval from the read marker location (301) at an output rate when data is written to the write marker location (300); ignoring at least some of the stored stream when the input rate is faster than the output rate; repeating at least some of the stored stream when the input rate is slower than the output rate; and converting the data stream into an analog representation.
Claim 14
Independent Claim
126 words
A method of performing the asynchronous reconstruction of digital speech into an analog representation comprising the steps of: storing an input data stream in a buffer (250) at an input rate wherein the improvement is characterized by: establishing a read marker location (301) within the buffer (250); establishing a write marker location (300) within the buffer (250); initiating data stream retrieval from the read marker location (301) at an output rate when data is written to the write marker location (300); ignoring at least some of the stored stream when the input rate is faster than the output rate; repeating at least some of the stored stream when the input rate is slower than the output rate; and converting the data stream into an analog representation.
References Cited (Backward Citations)
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