JPS5825621Y2 - receiving device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a channel selection device for a radio receiver.

In general, car radios and the like are configured so that several preset layers are selected and received using push buttons in order to facilitate tuning while driving.

In addition to this preset channel selection device, some devices are equipped with a so-called auto search channel selection device that automatically searches all reception bands and stops when a broadcast wave is caught.

FIG. 1 is a block diagram of a conventional electronic tuning radio receiver.

In the figure, the data control tuner 1 is a voltage synthesizer composed of a high frequency tuning circuit using a variable capacitance diode and a local oscillation circuit using a VCO (voltage controlled oscillator), or a PLL synthesizer system.
In either case, the tuning frequency is controlled by applying tuning command data from the outside.

This tuning command data T is given in a binary code (binary code) or a BCD code (binary coded decimal code).

In the case of preset tuning, preset data memory 2
Several layers of tuning command preset data Tp corresponding to the frequencies of the preset stations (these are now A, B, and C) are written in advance by the preset tuner 3 to the preset tuner 3. The preset station Tp is selected and called up via the preset tuner 3 and applied to the tuner control tuner 1 to receive the selected preset station.

In addition, in the case of automatic search tuning, the variable tuner 5 sends out a start signal, and the variable data generator 4 receives this signal and sets the broadcasting station at one channel interval (for example, 10K).
Outputs tuning command search data Tv that sequentially counts up or down in units of Hz), and when a broadcast is caught, the receiving detector 6 outputs a stop transmission signal S.
is transmitted, the variable data generator 4 stops counting, and the station is received.

If this receiving station is not the desired station, the variable tuner 5 sends out the start signal again, restarts counting the variable data Tv, and repeats the operation of selecting the next station.

When tuning manually, the variable data generator 4 is counted up or down via the variable tuning device 5 while the transmission of the stop signal S from the reception detector 6 is stopped. The system is configured so that the desired station can be selected.

In the conventional receiver configured in this way, preset stations are selected one by one in both automatic search and manual selection.

Considering that the auto search tuning function is originally a function used when you get tired of listening to the preset stations or the reception is poor and you want to select another station, this feature allows you to catch preset stations that you do not want to receive. As a result, it had the drawback of making it feel very inconvenient.

This invention is configured to skip preset stations and sequentially select stations during search tuning or manual tuning.

FIG. 2 is a block diagram of an embodiment of this invention, in which 7 is a data verification circuit, which searches the preset data Tp from the preset data memory 2 and the variable data generator 4.
Alternatively, the variable data Tv is manually generated.

Both data are collated and verified in a data verification circuit 7, and the data memory is sequentially accessed and verified each time the search or manually variable data Tv is counted.
If p and variable data Tv match, jump signal J
Send out.

The jump signal J generates an increment command signal when the count change of the variable data generator 4 is in the increasing direction, and a decrement command signal when it is in the decreasing direction,
The variable data Tv output by the variable data generator 4 is caused to jump by one unit.

The reception frequency controlled by such discontinuous search data Tv jumps between the preset frequencies A, B, and C, respectively, as shown in FIG.
, C is prevented from being tuned.

It should be noted that the above-mentioned frequency jump can be freely performed for both search and manual tuning, or can be performed only for either one of the tunings.

Further, although the above embodiment uses separate circuits for data memory and data detection, the portion surrounded by broken lines in the figure can be replaced with the microcomputer 10.

When such a microcomputer 10 is used, all controls for obtaining the same functions as in the embodiment described above are performed by software.

FIG. 4 shows an example of a schematic flowchart of a processing program within the microcomputer.

As explained above, this device is configured to skip over preset stations during search tuning or manual tuning, and is particularly applicable to automotive receivers for comfortable tuning. This has the effect of providing functionality.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional electronically tuned radio receiver, Figure 2 is a block diagram showing an embodiment of this invention, and Figure 3 is a block diagram of a conventional electronically tuned radio receiver.
The figure is a diagram showing the relationship between changes in variable data and reception frequency according to this invention, and FIG. 4 is a schematic flowchart of the progera operated by a microcomputer. In the figure, 1 is a data control tuner, 2 is a preset data memory, 3 is a preset tuner, 4 is a variable data generator, 5 is a variable tuner, 6 is a reception detector, 7 is a data verification circuit, 8 is an IF, a detection circuit, 9 is a low frequency output circuit,
10 is a microcomputer. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A data control tuner that determines the reception frequency according to input tuning command data, a preset tuner that sends selected tuning command preset data to this tuner at the time of preset tuning, and a search selector. A variable data generator that sends tuning command data that increases or decreases according to the command when tuning a station or manual tuning, and receiving from the output signal of the tuner when tuning the search station or manual tuning. and a reception detector that detects the presence of a station and sends out a stop signal that instructs the variable data generator to stop increasing or decreasing data, and the tuning command is issued during search tuning or manual tuning. When the preset data value and the tuning command search data or tuning command manual data that is being increased or decreased match the tuning command preset data value, the variable data generator increases or decreases the tuning command by jumping over the preset data value. 1. A receiving device comprising a data verification circuit that sends out a jump signal instructing the user to perform a jump signal.