N:1 bit compression apparatus and method
First Claim
Patent Images
1. An N:
- 1 data compression system for compressing data on N DS1 trunks carrying 4N channels, where N is greater than two, said DS1 data having eight bits per sample, said system comprising;
waveform encoding means coupled to said plurality of DS1 trunks for compressing said DS1 data into x bits per sample and producing encoded data and first control parameters, where x≦
8;
means coupled to said waveform encoding means for receiving said encoded data and first control parameters, further compressing said encoded data by performing digital speech interpolation and producing compressed data and second control parameters; and
means for receiving said compressed data and said second control parameters and producing a plurality of data packets including said compressed data and said second control parameters for transmitting on a single DS1 trunk.
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Abstract
An N:1 data compression system for compressing data on N DS1 trunks carrying 4N channels is disclosed. Waveform encoding circuitry is coupled to the N DS1 trunks for compressing the DS1 data into x bits and producing both encoded data and control parameters, where x≦8. The system further includes circuitry coupled to the waveform encoding circuitry for receiving the encoded data and control parameters, performing digital speech interpolation and producing data packets which may include encoded data and control parameters that are transmittable on a single DS1 trunk.
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Citations
23 Claims
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1. An N:
- 1 data compression system for compressing data on N DS1 trunks carrying 4N channels, where N is greater than two, said DS1 data having eight bits per sample, said system comprising;
waveform encoding means coupled to said plurality of DS1 trunks for compressing said DS1 data into x bits per sample and producing encoded data and first control parameters, where x≦
8;means coupled to said waveform encoding means for receiving said encoded data and first control parameters, further compressing said encoded data by performing digital speech interpolation and producing compressed data and second control parameters; and means for receiving said compressed data and said second control parameters and producing a plurality of data packets including said compressed data and said second control parameters for transmitting on a single DS1 trunk. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 1 data compression system for compressing data on N DS1 trunks carrying 4N channels, where N is greater than two, said DS1 data having eight bits per sample, said system comprising;
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13. A data compression system for compressing data on a plurality of DS1 trunks, each DS1 trunk bit stream including 192 data bits and one framing bit per frame, said system comprising:
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first interfacing means coupled to said plurality of DS1 trunks for receiving a plurality of bit streams therefrom, said first interfacing means extracting said framing bits from each bit stream and outputting said data bits; encoding means coupled to said first interfacing means for receiving said data bits and compressing said data bits, said encoding means producing compressed data bits and compression control parameters; packing means coupled to said encoding means for receiving said compressed data bits and compression control parameters, said packing means packing said compressed data bits and said compression control parameters and producing a packed bit stream for transmitting on a single DS1 trunk; second interfacing means coupled to said packing means for receiving said packed bit stream and inserting a framing bit for every 192 bits, said second interfacing means further coupled to a compressed DS1 trunk for providing said packed bit stream for transmission thereon. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. Apparatus for determining periods of silence in a channel carrying a signal, comprising:
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a bandpass filter for receiving said signal and passing only components of said signal within a predetermined frequency range; a squarer coupled to said bandpass filter for receiving and squaring said signal components; a low pass filter coupled to said squarer for receiving and filtering said squared signal components and producing a power signal representative of the power of said signal; a comparer for receiving said power signal level and comparing said power signal to a predetermined threshold level.
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23. Apparatus for determining data compressibility in a channel carrying a data signal, comprising:
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a low band bandpass filter receiving said data signal and passing only components of said signal within a first predetermined frequency range; first squarer coupled to said low band bandpass filter for receiving, squaring said signal components, and producing first squared signal components; first low pass filter coupled to said squarer for receiving and filtering said squared signal components and for producing a power signal representative of low band power of said data signal; a high band bandpass filter receiving said data signal and passing only components of said data signal within a second predetermined frequency range; second squarer coupled to said high band bandpass filter for receiving and squaring said signal components, and producing second squared signal components; second low pass filter coupled to said squarer for receiving and filtering said second squared signal components and for producing a power signal representative of high band power of said data signal; a comparer coupled to said first and second low pass filters for receiving said low and high band power signals respectively, and determining the relative strengths of said low and high band power signals.
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Specification