Signal-to-noise ratio measurement

Claim 1

A method of measuring the signal-to-noise ratio of a wave form having repetitive portions of substantially constant amplitude comprising the steps of: a. adding to the wave form a square wave signal having a repetition rate that is many times that of said wave form to produce a resultant signal having successive repetitive portions of the wave form at two different amplitude levels, b. displaying the resultant signal upon an oscilloscope as two vertically separated traces, c. varying the amplitude of the square wave to a predetermined fraction of the wave form maximum amplitude, d. measuring the adjusted square wave amplitude as a measure of wave form amplitude, e. further varying the square wave amplitude to bring said vertically separated traces into tangential relation, f. measuriNg the further varied square wave amplitude, and g. dividing the measurement of step d by the measurement of step f as a measure of signal-to-noise ratio.

Claim 2

A method of measuring the signal-to-noise ratio of a wave form having repetitive portions of substantially constant amplitude comprising the steps of: a. adding to the wave form a square wave signal having a repetition rate that is many times that of said wave form to produce a resultant signal having successive repetitive portions of the wave form at two different amplitude levels, b. displaying the resultant signal upon an oscilloscope as two vertically separated traces, c. varying the amplitude of the square wave to a predetermined fraction of the wave form maximum amplitude, d. measuring the adjusted square wave amplitude as a measure of wave form amplitude, e. further varying the square wave amplitude to bring said vertically separated traces into tangential relation, f. measuriNg the further varied square wave amplitude, and g. dividing the measurement of step d by the measurement of step f as a measure of signal-to-noise ratio.

Claim 3

A method of measuring the signal-to-noise ratio of a demodulated television signal wave form comprising the steps of: a. adding to the wave form a square wave signal to produce a resultant signal having successive repetitive portions of the wave form at two different amplitude levels, b. displaying the resultant signal upon an oscilloscope as two vertically separated traces, c. varying the amplitude of the square wave to align the vertical blanking level of one oscilloscope trace with the vertical synchronizing level of the other trace at an adjusted square wave amplitude, d. applying the adjusted square wave to a meter and setting the meter to full scale reading at twice the adjusted square wave amplitude, e. further varying the square wave amplitude to bring said vertically separated traces into tangential relation, and f. applying the further varied square wave of step (e) to said meter to provide a meter reading as the signal-to-noise ratio of the wave form.

Claim 4

A method of measuring the signal-to-noise ratio of a demodulated television signal wave form comprising the steps of: a. adding to the wave form a square wave signal to produce a resultant signal having successive repetitive portions of the wave form at two different amplitude levels, b. displaying the resultant signal upon an oscilloscope as two vertically separated traces, c. varying the amplitude of the square wave to align the vertical blanking level of one oscilloscope trace with the vertical synchronizing level of the other trace at an adjusted square wave amplitude, d. applying the adjusted square wave to a meter and setting the meter to full scale reading at twice the adjusted square wave amplitude, e. further varying the square wave amplitude to bring said vertically separated traces into tangential relation, and f. applying the further varied square wave of step (e) to said meter to provide a meter reading as the signal-to-noise ratio of the wave form.

Claim 5

A method of measuring the signal-to-noise ratio of a demodulated television signal wave form comprising the steps of: a. adding to the wave form a square wave signal to produce a resultant signal having successive repetitive portions of the wave form at two different amplitude levels, b. displaying the resultant signal upon an oscilloscope as two vertically separated traces, c. varying the amplitude of the square wave to align the horizontal blanking level of one oscilloscope trace with the horizontal synchronizing level of the other trace at an adjusted square wave amplitude, d. applying the adjusted square wave to a meter and setting the meter to full scale reading at twice the adjusted square wave amplitude, e. further varying the square wave amplitude to bring said vertically separated traces into tangential relation, and f. applying the further varied square wave amplitude of step (e) to said meter to provide a meter reading as the signal-to-noise ratio of the wave form.

Claim 6

A method of measuring the signal-to-noise ratio of a demodulated television signal wave form comprising the steps of: a. adding to the wave form a square wave signal to produce a resultant signal having successive repetitive portions of the wave form at two different amplitude levels, b. displaying the resultant signal upon an oscilloscope as two vertically separated traces, c. varying the amplitude of the square wave to align the horizontal blanking level of one oscilloscope trace with the horizontal synchronizing level of the other trace at an adjusted square wave amplitude, d. applying the adjusted square wave to a meter and setting the meter to full scale reading at twice the adjusted square wave amplitude, e. further varying the square wave amplitude to bring said vertically separated traces into tangential relation, and f. applying the further varied square wave amplitude of step (e) to said meter to provide a meter reading as the signal-to-noise ratio of the wave form.

Claim 7

A method of measuring the signal-to-noise ratio of a wave form including noise signals, and having at least two repetitive portions of substantially constant difference in amplitude with such difference having a substantially constant relationship to the maximum amplitude of the wave form, comprising the steps of: a. adding to the wave form a variable amplitude square wave signal having a frequency substantially in excess of the frequency of said wave forms to form a combined signal, b. displaying the combined signal on an oscilloscope to form two vertically separated traces of the wave form, c. adjusting the amplitude of said square wave signal to equal the difference in amplitude of said repetitive portions of said wave form, d. indicating the adjusted square wave amplitude of step (c), e. varying the amplitude of said square wave signal to bring the vertically separated traces on said oscilloscope into tangential relationship, and f. indicating the ratio of the varied square wave amplitude to adjusted square wave amplitude as a measure of signal-to-noise ratio of said wave form.

Claim 8

A method of measuring the signal-to-noise ratio of a wave form including noise signals, and having at least two repetitive portions of substantially constant difference in amplitude with such difference having a substantially constant relationship to the maximum amplitude of the wave form, comprising the steps of: a. adding to the wave form a variable amplitude square wave signal having a frequency substantially in excess of the frequency of said wave forms to form a combined signal, b. displaying the combined signal on an oscilloscope to form two vertically separated traces of the wave form, c. adjusting the amplitude of said square wave signal to equal the difference in amplitude of said repetitive portions of said wave form, d. indicating the adjusted square wave amplitude of step (c), e. varying the amplitude of said square wave signal to bring the vertically separated traces on said oscilloscope into tangential relationship, and f. indicating the ratio of the varied square wave amplitude to adjusted square wave amplitude as a measure of signal-to-noise ratio of said wave form.