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AssigneeBradley Telcom Corp.
InventorFrank R. Bradley
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There are disclosed instruments and methods for facilitating the measurement of characteristics of only a selected portion of a transmission channel. In my copending application Ser. No. 661,106, an apparatus located at the remote end of a channel of interest amplifies the received disturbance component relative to the received test tone, and forwards the resulting processed signal over a second channel to a test site. In this manner, the disturbance signal received by the test instrument represents the disturbance signal received at the remote end of the channel of interest, the disturbance introduced by the second channel being insignificant relative to the amplified disturbance component. In accordance with the present invention, an apparatus at the test site attenuates the received disturbance relative to the test tone by the same factor that it is amplified at the remote end of the first channel. In this manner, the composite test tone/disturbance signal applied to the test instrument is the same as that received at the remote end of the channel of interest.
Apparatus for processing a signal consisting of test tone and disturbance components received on a channel and for applying the processed signal consisting of tone and disturbance components to a test instrument comprising means for generating a tone whose frequency and phase are the same as those of the received test tone, and means for operating on the received signal and the generated tone for deriving said processed signal in which the ratio of the level of the disturbance component to the level of the tone component is less by a predetermined factor than the ratio of the level of the disturbance component to the level of the test tone component in the received signal, and the relative phases of the tone and disturbance components are the same as those in the received signal.
Apparatus for processing a signal consisting of test tone and disturbance components received on a channel and for applying the processed signal consisting of tone and disturbance components to a test instrument comprising tracking filter means for operating on the received signal to derive a signal proportional thereto but with the tone component absent, means for attenuating and inverting said derived signal, and means for adding together the attenuated and inverted signal and said received signal.
Apparatus for processing a signal consisting of test tone and disturbance components received on a channel and for applying the processed signal consisting of tone and disturbance components to a test instrument comprising means for operating on the received signal to derive a signal proportional thereto but with a tone level reduced relative to the disturbance level, means for attenuating said derived signal, and means for adding to the attenuated derived signal a tone having the same frequency and phase as those of the test tone contained in the received signal.
A test system for testing the characteristics of a communication channel of interest comprising a test tone generator connected to one end of said channel;
A test system for testing the characteristics of a communication channel of interest comprising a test tone generator connected to one end of said channel;
A test system for testing the characteristics of a communication channel of interest comprising a test tone generator connected to one end of said channel;
A method for processing a signal consisting of test tone and disturbance components received on a channel and for applying the processed signal consisting of tone and disturbance components to a test instrument comprising the steps of generating a tone whose frequency and phase are the same as those of the received test tone, and operating on the received signal and the generated tone for deriving said processed signal in which the ratio of the level of the disturbance component to the level of the tone component is less by a predetermined factor than the ratio of the level of the disturbance component to the level of the test tone component in the received signal, and the relative phases of the tone and disturbance components are the same as those in the received signal.
A method for processing a signal consisting of test tone and disturbance components received on a channel and for applying the processed signal consisting of tone and disturbance components to a test instrument comprising the steps of operating on the received signal to derive a signal proportional thereto but with the tone component level reduced relative to the disturbance component level, attenuating said derived signal, and adding to the attenuated derived signal a tone having the same frequency and phase as those of the test tone contained in said received signal for application to said test instrument.
A method for testing the characteristics of a communication channel of interest comprising the steps of transmitting a test tone from one end of said channel to the other;
A method for testing the characteristics of a communication channel of interest comprising the steps of transmitting a test tone from one end of said channel to the other;
A method for processing a received signal consisting of test tone and disturbance components and applying the processed signal to a test instrument comprising the steps of operating on the received signal to derive a signal proportional thereto but with the tone component level increased relative to the disturbance component level by a predetermined factor, and applying the derived signal to said test instrument.
Apparatus for processing a received signal consisting of test tone and enhanced disturbance components for application of the processed signal consisting of tone and disturbance components to a test instrument comprising means for determining the frequency and phase of the test tone in the received signal, and means responsive to said determining means for operating on the received signal to derive said processed signal in which the ratio of the level of the disturbance component to the level of the tone component is less by a factor than the ratio of the level of the disturbance component to the level of the test tone component in the received signal, and the relative phases of the tone and disturbance components are the same as those in the received signal.
A test system for testing the characteristics of a communication channel of interest comprising a test tone generator connected to one end of said channel;
Dependencies are inferred from the claim text.