Data communications system
First Claim
1. A data communications system for communicating digital data between a digital data source and a digital data sink, said data communications system comprising a standard telecommunications apparatus which includes an encoder which operates in accordance with a data rate adaptation process to generate transport digital signals from pre-transport digital signals representative of analogue signals, a data transmissions system for communicating said transport signals, and a decoder which operates in accordance with said data rate adaptation process to substantially re-generate the pre-transport signals from said transport signals communicated by said data transmission system, characterised in thatsaid data communication system further comprises a mapping data processor coupled to said data source and to said encoder which mapping data processor operates to generate coded symbols representative of the data from said data source in accordance with a predetermined mapping function, said coded symbols conforming to said pre-transport signals and an unmapping data processor connected to said decoder and to said data sink which unmapping data processor operates to substantially re-generate the data from communicated transport signals in accordance with said mapping function, wherein each of said coded symbols represents at least one digit of the data from said data source and said coded symbols are arranged in combination with said data rate adaptation process to substantially increase a rate of data communication over that achieved with the standard telecommunication system alone.
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Accused Products
Abstract
A data communications system includes a standard telecommunications apparatus (1) arranged to transport analogue signals in a form of Adaptive Differential Pulse Code Modulated (ADPCM) digital signals generated from Pulse Code Modulated (PCM) digital signals representative of the analogue signals. A mapping data processor (13) coupled to a source (14) of digital data and to an ADPCM encoder (3) of the standard telecommunications apparatus (1), generates PCM coded symbols representative of the digital data in accordance with a predetermined mapping function. An unmapping data processor (15) connected to an ADPCM to PCM decoder (10) of the apparatus (1) operates to re-generate the digital data from communicated PCM signals. The mapping and unmapping data processes are arranged in combination with the PCM and ADPCM encoding and decoding operations to provide a substantial increase in a rate of data communication, with respect to a data rate which would be achieved if the digital data were to be converted into analogue signals and fed to a PCM encoder of the standard telecommunications equipment.
20 Citations
9 Claims
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1. A data communications system for communicating digital data between a digital data source and a digital data sink, said data communications system comprising a standard telecommunications apparatus which includes an encoder which operates in accordance with a data rate adaptation process to generate transport digital signals from pre-transport digital signals representative of analogue signals, a data transmissions system for communicating said transport signals, and a decoder which operates in accordance with said data rate adaptation process to substantially re-generate the pre-transport signals from said transport signals communicated by said data transmission system, characterised in that
said data communication system further comprises a mapping data processor coupled to said data source and to said encoder which mapping data processor operates to generate coded symbols representative of the data from said data source in accordance with a predetermined mapping function, said coded symbols conforming to said pre-transport signals and an unmapping data processor connected to said decoder and to said data sink which unmapping data processor operates to substantially re-generate the data from communicated transport signals in accordance with said mapping function, wherein each of said coded symbols represents at least one digit of the data from said data source and said coded symbols are arranged in combination with said data rate adaptation process to substantially increase a rate of data communication over that achieved with the standard telecommunication system alone.
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8. A method of communicating data using a standard telecommunications apparatus, the standard telecommunications apparatus including an encoder which operates in accordance with a data rate adaptation process to generate transport digital signals from pre-transport digital signals representative of analogue signals, a data transmissions system for communicating said transport signals, and a decoder which operates in accordance with said data rate adaptation process to substantially re-generate the pre-transport signals from said transport signals communicated by said data transmission system, said method comprising the steps of
mapping the data to be communicated on to coded symbols, which coded symbols conform to said pre-transport data symbols, feeding said coded symbols to said encoder, using said standard telecommunications apparatus to communicate said coded symbols to the decoder, and unmapping the coded symbols to re-generate the data, wherein the steps of mapping and unmapping are effected in accordance with at least one digit of said data being communicated in combination with said data rate adaptation process performed by said encoder and said decoder.
Specification