Apparatus and method for measuring signal quality
AssigneeSamung Electronics Co., Ltd.
InventorsHyun-soo Park, Jae-seong Shim, Jae-wook Lee, Jung-hyun Lee, Eun-jin Ryu, Eing-seob Cho
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Abstract
An apparatus and method for measuring the quality of a signal on an optical disc based on level information of a viterbi decoder are provided. The signal quality measuring apparatus includes: a binary unit that generates binary signals from input RF signals; a channel identifier that receives the input RF signals and the binary signals output from the binary unit and outputs reference level values corresponding to the binary signals; and an information calculator that receives the reference level values and detects a signal quality value.
Claims18
A signal quality measuring apparatus, comprising:
- an analog-to-digital converter configured to convert input radio frequency signals into digital signals;
- an equalizer configured to equalize output signals from the analog-to-digital converter and output an equalized signal;
- a binary unit configured to generate and output binary signals from the equalized signal;
- a channel identifier configured to receive input signals of the equalizer and the binary signals output from the binary unit and output level values to be used as reference levels for the binary unit;
- and
- an information calculator configured to receive the level values and detect a signal quality value of the input radio frequency signals, the signal quality value comprising an asymmetry value of the input radio frequency signals,
- wherein the channel identifier is further configured to detect the level values on the basis of the input signals of the equalizer input during a predetermined time period.
A signal quality measuring method, comprising:
- converting input radio frequency signals into digital signals;
- equalizing the converted signals;
- generating binary signals from the equalized signals;
- receiving the converted signals and the generated binary signals and outputting level values to be used as reference levels for a binary unit;
- and
- receiving the level values and detecting a signal quality value of the input radio frequency signals,
- wherein the signal quality value comprises an asymmetry value of the input radio frequency signals.
A method of measuring signal quality of a signal reproduced from a medium according to at least one feature of the signal, the method comprising:
- converting the signal reproduced from the medium into a digital signal;
- equalizing the digital signal;
- coding the equalized signal into a binary format;
- obtaining a level average value according to both the digital signal and the binary coded signal;
- and
- calculating the quality of the signal reproduced from the medium according to the obtained level average values,
- wherein the calculating includes calculating at least one of an asymmetry value and a modulation ratio to measure the signal quality of the signal reproduced from the medium.
Dependencies are inferred from the claim text.