JPH02138933U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram of a television receiver embodying the present invention, FIG. 2 is a characteristic example of a UHF electronically tuned tuner, and FIG. 3 is a characteristic example of a VHF electronically tuned tuner. In the figure, 1 is the antenna terminal, 2 is the tuner part,
3 is a low-pass filter, 4 is a control unit, 5 is the same PWM conversion circuit, 6 is the same CPU, 7 is the same ROM, 8 is the same RA
M, 9 is a remote control signal receiving section, 10 is a key input section, and 11 is an input port of the control section.

Claims (1)

[Scope of utility model registration request] A tuner section that selects a channel by changing a DC voltage applied to a variable capacitance diode, a control section that converts tuning data corresponding to a specified channel into a DC voltage and outputs it to the tuner section, and a control command to the control section. In a television receiver equipped with a key input section or a remote control signal receiving section, the television receiver receives in advance radio wave signals of at least two predetermined channels within the receivable range of the television receiver, and performs the control when receiving the radio wave signals. calculating coefficients and constants of a calculation formula representing the relationship between the two from the tuning data of the control unit and the frequency of the radio signal, and storing the coefficients and constants in the memory of the control unit;
The tuning data is calculated from the channel number specified during the channel switching operation using the calculation formula including the coefficient and constant, the tuning data is converted to a DC voltage, and the DC voltage is applied to the variable capacitance diode of the tuner section. A channel selection device for a television receiver, characterized in that it selects the television radio waves of a specified channel.