JPH088512B2 - Electronic tuner - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electronic tuner, and particularly to an electronic tuner suitable for use as a car tuner.

“Prior Art” Most of the car tuners in recent years employ an electronic tuner. Some of these electronic tuners can preset the desired station for several stations, and from the ease of tuning,
The demand is increasing.

In this kind of preset tuner, the desired station is searched by automatic scanning by the frequency synthesizer,
The scanning is stopped when the station is synchronized with the corresponding station, and a predetermined preset operation is performed. And
After presetting, the preset switch corresponding to the desired station is pressed to immediately tune to the station.

[Problems to be Solved by the Invention] The final characteristic of a tuner is determined by the sum of various characteristics such as high-cut control characteristic, stereo noise control characteristic, and frequency characteristic. Therefore, depending on what the final characteristics are,
It is necessary to determine individual characteristics such as frequency characteristics. In the conventional electronic tuner, the manufacturer determines the final characteristic, and the individual characteristics such as the frequency characteristic are set to match the final characteristic.

However, since the tuner reception status varies depending on the user's local environment, the size of the broadcast output of the station, and the distance from the station, it is desirable that the final characteristics of the tuner also correspond to the reception status. . Therefore, it is ideal if various characteristics of the tuner can be set on the user side and for each station, but in the conventional electronic tuner, the final characteristics of the tuner are fixed characteristics set by the manufacturer. , The above request could not be met.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide an electronic tuner in which the user can set the characteristic for each station and the characteristic setting operation is easy.

[Means for Solving the Problems] In order to solve the above problems, in the invention according to claim 1, when the preset switch is operated in the preset mode, the preset area is stored in the storage area corresponding to the preset switch. In an electronic tuner that stores frequency data of a tuned station and that tunes according to the frequency data read from the corresponding storage area when the preset switch is operated in the read mode, at the preset switch operation time in the preset mode. A reception mode is selected in accordance with the reception mode data, and mode data indicating the selected reception mode is stored in the corresponding storage area together with the frequency data, and the reception mode data is stored from the storage area corresponding to the preset switch in the read mode. Read and receive this And a characteristic control means for controlling the characteristic of each part of the circuit constituting the tuner in accordance with the received data.

In the invention according to claim 2, when the preset switch is operated in the preset mode, the frequency data of the station tuned at that time is stored in the storage area corresponding to the preset switch, In the electronic tuner that tunes according to the frequency data read from the corresponding storage area when the preset switch is operated in the read mode, the receive mode is selected depending on which preset switch is operated in the preset mode, and the selected receive mode Receiving mode data indicating the reception mode data stored in the corresponding storage area together with the frequency data, and the reception mode data is read from the storage area corresponding to the preset switch in the read mode, and a tuner is set according to the reception mode data. Configure It has and a characteristic control means for controlling the characteristics of the road sections.

[Operation] In the invention of claim 1, the reception mode is set according to the time (for example, the time during which the preset switch is pressed) during which the preset switch is operated.

In the invention of claim 2, the reception mode is selected depending on which preset switch is operated. Therefore, the operator automatically sets the reception mode by operating the preset switch corresponding to the desired reception mode.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a front end, which is composed of a high frequency amplifier circuit, a local oscillation circuit and a mixing circuit. In this case, the local oscillator uses a PLL synthesizer, and when the frequency data is supplied, the oscillation frequency is controlled so as to tune to the frequency. Next, 2 is an intermediate frequency amplification / detection circuit including an intermediate frequency amplification circuit that amplifies the intermediate frequency signal output from the mixing circuit of the front end 1 and a detection circuit that detects the intermediate frequency output. The output signal is supplied to the multiplex circuit 3. Further, the intermediate frequency amplification / detection circuit 2 supplies the control circuit 7 with the signal S1 corresponding to the level of the received signal and the signal S2 indicating the level of the multipath noise. The multiplex circuit 3 is a circuit that demodulates a stereo signal, and the L channel signal and the R channel signal separated in this circuit are supplied to the equalizer circuit 4.

Here, the characteristics of the multiplex circuit 3 are shown in FIGS. FIG. 4A shows the high cut control characteristic, and two types of characteristics, characteristic A and characteristic B, can be selected. Here, the characteristic A has a low response to a low input level and is used in the normal mode (mode when the reception state is not so good). The characteristic B is used in the HiFi mode, which has a high response even at a low input level. Figure 2 (b)
Shows a stereo noise control characteristic, and the characteristic can be selected from either A or B shown in the figure. Characteristic A has a low degree of separation with respect to a low input level, and the reproducibility of stereo is not good. However, when there is a lot of noise in the received signal, it is preferable to lower the degree of separation because the noise is less noticeable. This characteristic A is used in the normal mode. Further, the characteristic B has a high degree of separation even at a low input level, and therefore has good stereo reproducibility, and is used in the HiFi mode. For the above characteristics, either the A or B characteristic is selected by the signal S3 supplied to the terminal HCC for the high cut control characteristic, and the signal S4 supplied to the terminal SNC for the stereo noise control characteristic. Either A or B characteristics are selected by.

Next, the equalizer circuit 4 shown in FIG. 1 is a circuit for performing de-emphasis and other frequency component adjustment, and either of the two frequency characteristics shown in FIG. 2 (C) can be selected. . The characteristic A shown in this figure is a characteristic that attenuates in the high frequency range, and the reproducibility on the high frequency side is not good. However, when there is noise in the high frequency range, the noise is reduced, which is preferable. This characteristic A is used in the normal mode. Further, the characteristic B has a flat characteristic from the low range to the high range, has good sound reproducibility, and is used in the HiFi mode. The selection of the characteristic in the equalizer circuit 4 is performed by the signal S5 supplied to the terminal F.
Done by The signal output from the equalizer circuit 4 is amplified by the amplifier 5 and supplied to the speaker 6.

Next, 7 shown in FIG. 1 is a control circuit that outputs the above-described signals S3, S4, and S5. Memory 11 in this control circuit 7
Is a program ROM in which programs used by the CPU 10 are stored, a RAM having a working area in which various data are temporarily stored and a preset data storage area in which preset data for stations (data contents are described later) are stored. It consists of in this case,
A portion of the preset data storage area is packed up with a battery so that the stored content is retained. In addition, the CPU 10 has a built-in timer so that it can perform timekeeping processing. Next, 12, 13 and 14 are I /
Reference numeral 15 is an O interface, and reference numeral 15 is a piezoelectric element that is activated by a signal supplied from the CPU 10.

20 stores the preset data for the desired station in the memory 11
It is a memory keyboard that is operated when it is stored in
It has push switches SW1 to SW6. The ON / OFF signals of these switches SW1 to SW6 are supplied to the CPU 10 via the I / O interface 12. The preset data storage area of the memory 11 is composed of a plurality of storage areas corresponding to the switches SW1 to SW6.

Next, the operation of this embodiment having the above configuration will be described.

First, an automatic scanning switch (not shown) is pressed to sequentially change the local oscillation frequency of the front end 1 to search for a desired station. When tuning to the desired station, fix the local oscillation frequency and press one of the switches SW1 to SW6. Which switch SW1 to SW6 is pressed depends on which number the currently tuned station is preset to. If you want to preset to number "1", switch SW1
Press. Then, when any of the switches SW1 to SW6 is pressed, the CPU 10 performs the processing of the subroutine shown in FIG. First, in step SP1, it is determined whether or not the switch SW1 has been pressed for 2 seconds or more. The timing in this case is CP
This is done by the timer provided in U10. Then, if the determination in step SP1 is “YES”, the process proceeds to step SP2, a drive signal is supplied to the piezoelectric element 15, and a buzzer sound “beep” is generated. Next, in step SP3, the frequency data of the currently tuned station and the data for selecting the characteristic A shown in each of FIGS. 2 (a), (b) and (c) are set as a set of preset data. Is stored in the memory 11. In this case, the preset data is stored in the area corresponding to the switch SW1 in the memory 11. Next, in step SP4, it is determined whether or not the switch SW1 has been pressed for another 2 seconds. If this determination is “NO”, the process returns, and if “YES”, the process proceeds to step SP5, the drive signal is supplied to the piezoelectric element 15, and the buzzer sound “beep” is generated, step SP2 In the step SP5, the "peeping" sound was generated once, but the "peeping" sound was generated twice. Next, in step SP6, the frequency data of the currently tuned station and the data for specifying the characteristic B shown in FIGS.
Write to the memory 11 as a set of preset data. In this case, the preset data is written in the area corresponding to the switch SW1 in the memory 11. Although preset data has already been written in this area in step SP3, the characteristic B is rewritten by the preset data to be instructed by the processing in step SP6. Then, when the processing of step SP6 ends, the process returns and the third
The subroutine shown in the figure ends.

As can be seen from the above description, the operator may press and hold the switch SW1 for 2 seconds to receive the desired station with the A characteristic, and press the switch SW1 for 4 seconds to receive the desired station with the B characteristic. Which characteristic is set can be identified by the difference in the buzzer sound emitted by the piezoelectric element 15. This operation is the same for the other switches SW2 to SW6.

Next, an operation for receiving the preset station as described above will be described. First, the switches SW1 to SW6
Press the switch with the number corresponding to the desired station. As a result, the subroutine shown in FIG. 3 is activated, and step SP
A judgment of 1 is made. Now, if the switch SW1 is pressed and the pressing time is within 2 seconds, the determination in step SP1 becomes "NO", and the process proceeds to step SP7. This step SP7
In, the preset data is read from the area in the memory 11 corresponding to the pressed switch, that is, switch SW1 in this case. Then, the frequency data in the preset data is supplied to the PLL synthesizer of the front end 1, and if the preset data indicates the characteristic A or B, the values of the signals S3 to S5 are changed to the characteristic A or B.
Is a value that indicates. As a result, the frequency synthesizer in the front end 1 is controlled to have the local oscillation frequency corresponding to the frequency of the desired station. Also, the multiplex circuit 3 and the equalizer circuit 4 are set to the characteristic indicated by the preset data, that is, the desired characteristic of the A characteristic or the B characteristic. In this way, by pressing any one of the switches SW1 to SW6 within 2 seconds, the preset station is tuned with a desired characteristic (A or B).

However, even if the B characteristic (HiFi mode) is set, the CPU 10 may change to the A characteristic based on the signal S1 or S2 supplied via the I / O interface 13. That is, if the reception condition is poor and the input signal level is low, or if there is a lot of multipath noise, B
The HiFi mode due to the characteristics is stopped and changed to the normal mode due to the characteristics A, and then the normal mode is maintained until the reception condition becomes better.

In the above embodiment, the characteristics are selected according to the time when the switches SW1 to SW6 are pressed, but instead of this, for example, when presetting is performed by the switches SW1 to SW4, the characteristics A and the switch SW5 are used. If B6 is preset by SW6, the B characteristic may be automatically selected. That is, the reception mode is selected depending on which preset switch is pressed.

Further, as shown in FIG. 1, a mode switch SWM is provided, and when the preset operation is performed when the mode switch SWM is on, the B characteristic is selected, and when the preset operation is performed, the B characteristic is selected. The characteristics may be selected. The mode switch SWM is configured to repeat ON / OFF each time it is pressed, for example.

Also, in the above embodiment, the reception mode is Hi
Two kinds of Fi mode and normal mode were set,
The number of modes is not limited to two, and other modes may be set. In other words, the characteristics of each part of the circuit are set more, and the characteristics are selected.In addition, another mode is set according to the reception state and one of the modes is selected in relation to the preset operation. To configure.

Furthermore, the present invention is suitable for use in a car tuner whose usage environment changes with movement, but can of course be applied to an installation type audio tuner. This is because the use environment differs depending on the aza, and it is necessary to set the characteristics on the user side for each station.

[Advantages of the Invention] As described above, according to the invention of claim 1 or 2, the reception mode is set in accordance with the operation mode of the preset switch or the operation of the dedicated switch for selecting the reception mode. Since the characteristic control means controls the characteristic of each part of the circuit so as to correspond to the selected reception mode, the characteristic can be set for each station on the user side, and the characteristic setting is related to the preset operation. Therefore, there is an advantage that the operability can be made extremely good.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing the structure of an embodiment of the present invention, and FIG.
FIG. 3 is a characteristic diagram showing characteristics of each part of the circuit in the same embodiment, and FIG. 3 is a flow chart showing operation of the same embodiment. 10: CPU (reception mode selection means: characteristic control means), 11
...... Memory (storage means), SW1 to SW6 …… Preset switch, SWM …… Mode switch.

Claims (2)

[Claims] 1. When a preset switch is operated in the preset mode, frequency data of a station which is tuned at that time is stored in a storage area corresponding to the preset switch, and the preset switch is operated in the read mode. Then, in the electronic tuner that tunes according to the frequency data read from the corresponding storage area,
In the preset mode, the receiving mode is selected according to the operation time of the preset switch, and the receiving mode selecting means for storing the mode data indicating the selected receiving mode in the corresponding storage area together with the frequency data, and the preset switch in the reading mode. An electronic tuner, comprising: characteristic control means for reading the reception mode data from a corresponding storage area and controlling the characteristics of each part of the circuit constituting the tuner according to the reception mode data. 2. When the preset switch is operated in the preset mode, the frequency data of the station that is tuned at that time is stored in the storage area corresponding to the preset switch, and the preset switch is operated in the read mode. Then, in the electronic tuner that tunes according to the frequency data read from the corresponding storage area,
Reception mode selecting means for selecting a reception mode depending on which preset switch is operated in the preset mode and storing reception mode data indicating the selected reception mode in a corresponding storage area together with the frequency data, and a preset switch in the read mode An electronic tuner, comprising: a characteristic control unit that reads the reception mode data from a storage area corresponding to, and controls a characteristic of each part of a circuit that configures the tuner according to the reception mode data.