Television monitor control apparatus

Claim 2

Television monitor control apparatus comprising: standard signal input means (3, 4); signal processing means (6) supplied with a standard television signal from said standard signal input means (3, 4); and a colour cathode ray tube (8) supplied with a processed colour signal obtained from said signal processing means (6); characterised by: reference signal memory means (14) for storing at least one set of reference signals; and signal control means (9) connected to said signal processing means (6) and said reference signal memory means (14) for adjusting the operation of said signal processing means (6) in response to a relation between said standard television signal and at least a selected one of said reference signals.

Claim 3

Television monitor control apparatus according to claim 1 wherein said signal processing means (6) includes a colour gain control amplifier (22), a colour hue control circuit (23), and drive bias and drive gain control circuits (7).

Claim 4

Television monitor control apparatus according to claim 2 wherein said standard signal input means (3, 4) includes colour bar generator means (3) which generates a colour bar signal supplied as said standard television signal to said signal processing means (6) when adjusting a colour gain and a colour hue of said signal processing means (6) by said signal control means (9).

Claim 5

Television monitor control apparatus according to claim 3 wherein said signal control means (9) includes level detecting and comparing means (9), means operating said level detecting and comparing means (9) to compare the level of a blue colour portion of said colour bar signal as processed by said signal processing means (6) with the level of the blue component of a white portion of the processed colour bar signal, means for adjusting the gain of said colour gain control amplifier (22) in response to an output of said level detecting and comparing means (9) so as to achieve coincidence of the levels of the compared blue portion and blue component of the white portion of said processed colour bar signal, means coperating said level detecting and comparing means (9) to compare the level of said blue component of the white portion of the processed colour bar signal with the level of the blue component of a cyan or magenta portion of the processed colour bar signal, and means for adjusting said colour hue control circuit (23) in response to an output of said level detecting and comparing means (9) so as to achieve coincidence of the levels of the compared blue components of the white portion and of the cyan or magenta portion of the processed colour bar signal.

Claim 6

Television monitor control apparatus according to claim 2 wherein said standard signal input means (3, 4) includes white signal generator means (4) which generates high level white and low level white signals each comprised of respective three primary colour signals and being selectively supplied as said standard television signal to said signal processing means (6) when adjusting a white balance of said signal processing means (6) by said signal control means (9).

Claim 7

Television monitor control apparatus according to claim 5 wherein said signal control means (9) includes brightness detecting means (12) for detecting a brightness of said colour cathode ray tube (8), and means for controlling said drive bias and drive gain control circuits (7) on the basis of a comparison of said one selected reference signal from said reference signal memory means (14) with a signal corresponding to the detected brightness of said colour cathode ray tube (8).

Claim 8

Television monitor control apparatus according to claim 6 wherein said reference signal memory means (14) stores high and low level sets of red, green and blue colour reference signals, said signal processing means (6) is operative, during said adjusting of its white balance, individually to apply processed red, green and blue colour signals in sequence tosaid colour cathode ray tube (8) so that said brightness detecting means (12) detects only red, green and blue colours, respectively, displayed, in sequence, by said colour cathode ray tube (8), and said red, green and blue colour reference signals of the high and low level sets are selected for comparison with a detected output of said brightness detecting means (12) when said signal processing means (6) applies processed red, green and blue colour signals in response to said high level and low level white signals, respectively.