JPS6138282Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a preset receiver having a preset memory in which a tuning voltage value output from a manually operated tuning volume is stored, and in particular relates to a preset receiver having a preset memory that stores a tuning voltage value output from a manually operated tuning volume. The system is designed to store the corrected optimum tuning voltage value.

Manually operate the tuning volume to achieve a tuning state, convert the tuning voltage at this time into a digital value and store it in a preset memory, and convert the read output of this preset memory into a digital-to-analog converter. A preset receiving device that enables preset reception by using a tuning voltage is well known. By the way, when manually operating the tuning volume, it is not always possible to obtain the optimal tuning voltage, and the digital value related to the optimal tuning voltage may not be preset in the preset memory. That is _, if the tuning voltage range in which a good reception condition can _be obtained in _FIG . In this case, even if the voltage changes from V _t1 to V _t2 due to temperature changes, etc., it remains within the range of V ₁ to _{V 2} and a good reception condition can be maintained. By the way, when the tuning volume is operated manually, it is not necessarily possible to obtain the optimum tuning voltage V ₀ . That is, in the range of V ₁ to _{V 2} a good reception condition is achieved, so there is a strong possibility that the operation will be stopped when the tuning voltage reaches V ₀ ', for example (see FIG. 1b). In this case, if the tuning voltage fluctuates from V' _t1 to V' _t2 due to temperature changes, etc., a good reception condition will not be achieved in the range V ⁰ ' _t1 to V ₁ ). Therefore, in the present invention, even if the manually set tuning voltage deviates from the optimum tuning voltage V _{0, the optimum tuning voltage V 0 is} always preset when presetting. be.

The present invention will be described in detail below with reference to the embodiment shown in FIG. Reference number 1 in the figure is a tuning volume, and the tuning voltage obtained from this tuning volume 1 is written into a buffer memory 2 consisting of a capacitor. The tuning voltage once written in the buffer memory 2 is applied to a tuner circuit 3 having a voltage controlled oscillator. The output of the tuner circuit 3 is applied to an intermediate frequency amplifier 4,
The signal is further detected and turned into an audio signal, which is applied to a speaker (not shown). On the other hand, the output of the intermediate frequency amplifier 4 is applied to an automatic frequency control circuit 5, and an output corresponding to the tuning state is derived. The output signal corresponding to this tuning state is buffer memory 2.
The tuning voltage applied to the buffer memory 2 and stored in the buffer memory 2 is corrected to obtain the optimum tuning voltage. This optimum tuning voltage is converted into a digital value by an analog-to-digital converter 6 and applied to a preset memory 7.

By operating both the memory switch 8 and the address designation switch 9, a desired tuning voltage can be written to a desired address.

When selecting a channel, a desired address is specified in the preset memory 7 by the address designation switch 9, and the read digital value is converted into a tuning voltage by the analog-to-digital converter 6.
By applying the signal to the tuner circuit 3 via the buffer memory 2, preset reception is achieved.

In the above explanation, the tuning voltage was once converted to a digital value and stored in the preset memory, but if the preset memory is configured with an analog memory using MOS/FET, the tuning voltage may be stored in the preset memory as an analog quantity.

According to the present invention described above, even when manually operating the tuning volume to obtain the tuning voltage, the optimum tuning voltage analog value or digital value can always be written into the preset memory. Even if the stored value slightly fluctuates due to temperature changes, etc., good preset reception can be achieved.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the fluctuation range of tuning voltage.
FIG. 2 is a block diagram of a preset receiving device according to the present invention. 1 is a tuning volume, 2 is a buffer memory, 3 is a tuner circuit, 5 is an automatic frequency control circuit, 6 is an analog-to-digital converter, and 7 is a preset memory.

Claims (1)

[Scope of utility model registration request] A tuner that includes a tuning volume for obtaining a tuning voltage, a buffer memory in which the tuning voltage output from the tuning volume is written, and a voltage controlled oscillator to which the readout output of the buffer memory is applied as the tuning voltage. a circuit, an automatic frequency control circuit that outputs a signal according to the tuning state and uses this output signal to correct the tuning voltage stored in the buffer memory, and a preset circuit in which the corrected optimum tuning voltage value is preset. A preset receiving device characterized by having a set memory.