Emphasis-adding system and emphasis-adding method

摘要

A display part is provided with a display screen with a horizontal axis representing a time and a vertical axis representing an amount of modulation and a pre-emphasis waveform image is displayed on the display screen. In the pre-emphasis waveform image, a cursor can be arranged on a tap which corresponds to a portion in which a bit can be emphasized. An emphasis waveform addition part generates an emphasis waveform corresponding to the pre-emphasis waveform image on the display screen, based on an amount of amplitude changed according to movement of the cursor, and adds the emphasis waveform to the test signal. Thus, a user is allowed to make a setting with intuitive operation.

主权项

1. An emphasis-adding system for giving pre-emphasis to a digital test signal that is input to a device-under-test, the emphasis-adding system comprising:
a processor; a memory; a display part that displays a pre-emphasis waveform image on a display screen with a horizontal axis representing a time and a vertical axis representing an amount of modulation, a cursor being arranged at a portion where an intensity of the pre-emphasis is changeable in the pre-emphasis waveform image; a manipulating part with which the cursor is moved; an emphasis waveform addition part that generates an emphasis waveform corresponding to the pre-emphasis waveform image on the display screen, based on an amount of amplitude changed according to movement of the cursor, and adds the emphasis waveform to the test signal; a position information detecting part that detects position information about the cursor moved with the manipulating part; an information storing part that stores waveform information about a plurality of types of reference waveform patterns defined in advance, a changeable range of each cursor arranged at the tap of the reference waveform pattern, an amount of amplitude per dot on the display screen, and a time per dot on the display screen; and a setting value calculating part that calculates a setting value for generating an emphasis waveform corresponding to the pre-emphasis waveform image on the display screen, based on the information stored in the information storing part and the position information of the cursor detected by the position information detecting part, wherein the emphasis waveform addition part generates an emphasis waveform corresponding to the pre-emphasis waveform image on the display screen, based on the setting value calculated by the setting value calculating part, and adds the emphasis waveform to the test signal.