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AssigneeBell Telephone Laboratories, Incorporated
InventorsJames O. Edson, Theodore F. Gleichmann, Charles O. Mallinckrodt
Estimating the term…
1. In a multichannel communication system in which the intelligence waves are transmitted by pulse code modulation, means for producing a plurality of series of pulses interleaved in their time of occurrence and the pulses of each series being modulated in duration in proportion to successive samples of the intelligence wave of a corresponding channel, a source of oscillations of constant frequency, a gate controlled by the duration modulated pulses for transmitting oscillations from said source for the duration of each of said pulses, a binary counter having a plurality of tandem connected stages each of two conditions of stability, means for supplying to said counter the oscillations transmitted by said gate, a storage circuit for each stage of said binary counter except the first, a switching circuit connecting each of said storage circuits to the corresponding stage of the binary counter to supply to the storage circuit an electrical quantity under control of the condition of stability of the respective counter stage, a timing circuit for producing a sequence of pulses corresponding to the pulse intervals of each pulse code group, a pulse circuit under control of the first stage of said counter, connections for supplying the first pulse of each of said sequences to said pulse circuit to render it operative for transmitting a pulse when the first stage of said counter is in a predetermined one of said conditions of stability, other connections for supplying said first pulse of each of sequences to said switching circuits for registering on said storage circuit the condition of stability of the respective counter stage, a pulse circuit under control of each of said storage circuits, and connections for supplying to the last-mentioned pulse circuits in succession corresponding subsequent pulses of each of said sequences to render the pulse circuits operative for transmitting a pulse under control of the condition of the corresponding storage circuit.
In a multichannel communication system in which the intelligence waves are transmitted by pulse code modulation, means for producing a plurality of series of pulses interleaved in their time of occurrence and the pulses of each series being modulated in duration in proportion to successive samples of the intelligence wave of a corresponding channel, a source of oscillations of constant frequency, a gate controlled by the duration modulated pulses for transmitting oscillations from said source for the duration of each of said pulses, a binary counter having a plurality of tandem connected stages each of two conditions of stability, means for supplying to said counter the oscillations transmitted by said gate, a storage circuit for each stage of said binary counter except the first, a switching circuit connecting each of said storage circuits to the corresponding stage of the binary counter to supply to the storage circuit an electrical quantity under control of the condition of stability of the respective counter stage, a timing circuit for producing a sequence of pulses corresponding to the pulse intervals of each pulse code group, a pulse circuit under control of the first stage of said counter, connections for supplying the first pulse of each of said sequences to said pulse circuit to render it operative for transmitting a pulse when the first stage of said counter is in a predetermined one of said conditions of stability, other connections for supplying said first pulse of each of sequences to said switching circuits for registering on said storage circuit the condition of stability of the respective counter stage, a pulse circuit under control of each of said storage circuits, and connections for supplying to the last-mentioned pulse circuits in succession corresponding subsequent pulses of each of said sequences to render the pulse circuits operative for transmitting a pulse under control of the condition of the corresponding storage circuit.
In a multichannel communication system in which the intelligence waves are transmitted by pulse code modulation, means for producing pulses modulated in length in proportion to the amplitude of successive samples of each of the intelligence waves, a source of oscillations of constant frequency, a gate controlled by said length modulated pulses for transmitting oscillations from said source for the duration of each of said pulses modulated in length, a binary counter having a plurality of tandem connected stages each of two conditions of stability, means for supplying to said counter the oscillations transmitted by said gate, a plurality of storage circuits normally inoperative, means each adapted when operative to impress on a respective one of said storage circuits an electric quantity indicative of the condition of stability of the corresponding stage of said counter, means for rendering momentarily operative said lastmentioned means for a short interval subsequent to the termination of each length modulated pulse, and means for transmitting a series of code modulated pulses under control of the condition of said storage circuits while said counter is being operated by the oscillations being transmitted by said gate under control of a subsequent modulated pulse.
In a system in which waves are transmitted by pulse code modulation by producing pulses modulated in length in proportion to the amplitude of successive samples of the wave to be transmitted and a binary code group of pulses representing each sample amplitude is determined by counting in a binary counter the number of half cycles of a standard frequency wave occurring during each length modulated pulse, means for regulating the average length of the length modulated pulses comprising means for comparing the number of amplitude samples with the number of counts of the counter stage registering the highest denominational order of the binary code, means for producing a voltage representative of said comparison and means for regulating the average length of said length modulated pulses in accordance with said voltage.
In a system for producing permutation code groups of pulses representative of length modulated pulses, a source of oscillations of constant frequency, a gate controlled by said length modulated pulses for transmitting said oscillations for the duration of each of said pulses, a binary counter having a plurality of tandem connected stages each of two conditions of stability, means for supplying to said counter the oscillations transmitted by said gate, means responsive to the operation of all the stages of said counter except the first to one of said two conditions of stability for preventing a supply of oscillations to the first stage for actuating it to the other of said two conditions of stability.
In a signaling system for transmitting complex signaling waves, apparatus for sampling said signaling waves at recurring instants of time, a binary counter comprising a plurality of stages, means for controlling the number counted by said counter in accordance with the magnitude of each of the samples of the complex wave, apparatus controlled by one of the stages of said counter for transmitting a pulse, other equipment operating to store the condition of the other stages of said counter, means for transmitting the stored information by pulses transmitted in succession, each representing a different denominational order of the number counted by a binary count, and means for controlling the number counted by said couner in accordance with the magnitude of another complex wave sample while said pulses are being transmitted.
In a communication system for the transmission of complex waves, apparatus for sampling a complex wave at a recurring instant of time, other equipment for generating permutation code groups of pulses representing each of said samples and means operated in response to the operation of said coding equipment for varying the magnitude of said samples so that the average magnitude of all the samples is in the middle of the coding range of said coding equipment.
In a communication system apparatus for sampling complex signaling waves at successive instants of time, a binary counter for controlling the magnitude of each of said samples and apparatus operative incident to the counting of said counter beyond half of its total possible maximum count for reducing the magnitude of said samples to maintain the average magnitude of said samples at a value to cause said counter to operate to half of its maximum count in response to such average magnitude.
In a communication system apparatus for sampling complex signaling waves at successive instants of time, a binary counter for controlling the magnitude of each of said samples and apparatus operative incident to the counting of said counter less than half of the total possible count for increasing the magnitude of said samples to maintain the average magnitude of said samples at a value to cause said counter to operate to half of its maximum count in response to such average magnitude.
Dependencies are inferred from the claim text.