JPS6119177B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel selection device, and particularly to a channel selection device suitable for application to an operation panel of a vehicle-mounted radio receiver.

In recent years, frequency synthesizers have been put into practical use to control in-vehicle radio receivers. According to this method, PLL (Phase Locked
Arbitrary channel selection can be performed by setting digital values in the Loop) circuit. Therefore, not only manual channel selection but also automatic channel selection can be easily performed, and various functions can be provided. A digital control IC (integrated circuit) performs these functions. The input section of this IC is provided with a large number of input control switches. In this case, a large number of input control switches are arranged in a matrix to simplify the bus line of the digital control IC. However, as will be described later, even with such a matrix arrangement, the number of input control switches is, for example, ten or more, and the shape of the operation panel on the car's instrument panel becomes considerably large. Moreover, the selection operation of the switch becomes complicated. Furthermore, an inconvenient problem arises in that the number of input control switches must be increased each time the functions other than channel selection are increased.

Therefore, an object of the present invention is to reduce the number of input control switches and downsize the operation panel.
It is an object of the present invention to propose a channel selection device that facilitates switch selection operations and can increase various functions as needed while keeping the number of switches unchanged.

In accordance with the above object, the present invention comprises a matrix located at the input part of a digital control IC for controlling a frequency synthesizer type radio receiver, and a plurality of horizontal signal lines of the matrix are used for scanning an input control switch. A plurality of phase-shifted time signals are transmitted, while a plurality of vertical signal lines of the matrix transmit on/off information of an input control switch, and each intersection of the horizontal and vertical signal lines is connected to the input control switch. In the channel selection device comprising connected control switches, each input control switch has at least two
It is set in advance so that more than one type of different input control information can be selected, while each of the horizontal signal lines is connected to any one of the plurality of time signals via a changeover switch.
Which of the input control information is selected by each input control switch is determined by switching the changeover switch to transmit a desired one of the time signals to the corresponding one of the horizontal signal lines. It is characterized by the fact that it is done by doing things.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a circuit diagram showing an example of a conventional channel selection device. In this figure, the channel selection device 10 is a digital
It is roughly divided into a control IC 11 and a matrix 12. Among these, the present application particularly refers to the matrix 12. Furthermore, IC1
1 performs various functions such as supplying digital values to the PLL circuit described above and displaying the received frequency and time. The matrix 12 includes a plurality of horizontal signal lines 13-1 to 13-4, a plurality of vertical signal lines 14-1 to 14-4, and input control switch groups arranged at each intersection of these signal lines. Consists of (ASU,...SCA). Horizontal signal line 1
3-1 to 13-4 are connected to the corresponding T ₁ to _{T 4} outputs at the input section of the IC 11, respectively, and vertical signal lines 14-1 to 14-4 are connected to the corresponding K ₁ outputs at the input section of the IC 11, respectively. ~ Connect to _K4 input. The _T1 to _T4 outputs output time signals whose phases are sequentially shifted from each other. On the other hand, the _K1 to _K4 inputs receive on/off information of the input control switches, and determine which switch is turned on. For example, if a time signal with a timing of _T1 is received at the _K2 input, it will be known that the switch ASD has been turned on. Also, for example, if a time signal with timing _T4 is received at the _K3 input, it will be known that the switch MA has been turned on. Here, the meanings of the symbols for these input control switches will be clarified.

ASU: Automatic tuning "up" direction switch ASD: Automatic tuning "down" direction switch MSU: Manual tuning "up" direction switch MSD: Manual tuning "down" direction switch CH1 to CH7: Channels 1 to 7 preset Set switch MEM: Switch for writing channels 1 to 7 to memory PT: Switch for setting minutes and seconds RA: Time adjustment switch MA: Time adjustment switch SCA: Automatic channel selection switch Switches for Stop Sweep As is clear from Figure 1, when configuring the channel selection device, there are actually 16 switches (ASU,...
SCA) is required, which increases the size of the car's control panel and complicates its operation. or,
If additional functions were needed, the only option was to increase the number of signal lines in vertical and horizontal pairs and install new input control switches at the intersections created there.

Therefore, the present invention provides the following channel selection device in order to solve the above-mentioned problems. Note that the same reference numbers or symbols used in the drawings that appear in the following description indicate the same components.

FIG. 2 is a circuit diagram showing a first embodiment of a channel selection device based on the present invention. In this figure, the channel selection device 20
is IC11, matrix 22 and changeover switch 2
3, and the horizontal signal lines are two signal lines 13-12, 13-34 compared to the case of FIG.
has been reduced to Therefore, the number of input control switches is halved from 16 to 8.
In this case, each switch must have twice as many functions as its number has been halved. That is, as shown in the figure, the input control switch selectively sends out at least two types of input control information. For example, ASU/CH1, ASD/CH2...
...Like SCA/MEM. When one switch is turned on, which of the upper and lower information is selected is determined by the time signal applied to the horizontal signal line of the switch. This channel selection is performed by the changeover switch 23. In the illustrated case, the changeover switch 23 is a two-circuit interlocking switch.
Turn switch 23 on (or on).
When connected to the off) side, time signals T ₂ (or T ₁ ) and T ₃ (or T ₄ ) are transmitted to signal lines 13-12 and 13-34, respectively. Therefore, if the switch 23 is connected to the left side, for example, and a signal is received at the input _K2 , then when corresponding to FIG.
This means that out of ASD/CH2, ASD was selected.

Also, connect the switch 23 to the right side, for example, and input
If the signal is received at _K4 , then when compared to FIG. 1, it means that MEM is selected among SCA/MEM.

As described above, according to the present invention, the number of switches can be reduced and the operation panel can be downsized, and the operation is also easy and there is no fear of erroneous operation.
An example of a simplified operation panel of a car instrument panel is shown in FIG. FIG. 3 is a front view showing an example of the configuration of an operation panel realized when the channel selection device shown in FIG. 2 is used. In this figure,
ASU/CH1, ASD/CH2……SCA/MEM
is the input control switch also shown in FIG. 2, and consists of eight independent switches. The changeover switch 23 determines which input control information to select for each switch. In addition, 31 in this figure is an indicator,
Also displays AM or FM frequency (Hz),
Depending on the channel selected, the time will also be displayed. 32 is volume,
33 is a tone. However, these arrangements may be arbitrary. Further, it may be arbitrarily determined which input control information each switch should be paired with. Practically speaking, the top (or bottom) of each switch stores frequently used functions (CH1 to CH7, etc.), and the bottom (or top) of each switch stores less frequently used functions (MEM, etc.).
RT etc. may be arranged. Furthermore,
The selector switch 23 is a non-lock switch, and the function of operating one input control switch while switching the switch 23 to one side is used infrequently, and when each switch is turned on,
A frequently used function may be selected.

FIG. 4 is a circuit diagram showing a second embodiment of the channel selection device according to the present invention. In this figure, only the input control switches connected to the signal lines 13-34 of the matrix 42 each have two types of functions. That is, RT/CH1, HA/CH6, MA/CH7, SCA/
It is MEM. Which one is selected is determined by a single circuit changeover switch 43. If it corresponds to the case in Fig. 1, switch 43
When connected to _T3 side, select CH5~CH7, MEM
When connected to _T4 side, RT, HA,
MA and SCA are selected. In this embodiment, only the least frequently used RT, HA, MA, etc. are switched to switch 4.
Since it is selected in step 3, it is considered to be the most practical. Therefore, switch 43 is preferably a non-lock switch.

In the above description, the case where a one-circuit or two-circuit changeover switch is used as a changeover switch has been shown, but the present invention is not limited to this, and it can also be realized by, for example, a set of a rotary switch and a changeover switch linked thereto. This is illustrated in the fifth
It is a diagram. Traditionally, manual tuning on radio receivers
MSU and MSD rotated a dial knob (rotary switch). In other words, electronic tuning
Digital value to be supplied to the PLL circuit (dividing ratio N)
was turned on and off using a switch, increasing and decreasing its value. This method can also be applied to the changeover switch of the present invention, and for example, the MSU and MSD can be provided with HA and MA, respectively. Now, if you interlock the interlocking rotary switches MSU/MA and MSD/HA and step them counterclockwise, the first
The changeover switch 51 captures the rotary switch MSD/HA. Conversely, by stepping clockwise, rotary switch MSU/MA is captured. Furthermore, rotary switch MSD/HA (or MSU/M
To select MSU or MA with A) captured, the T input is connected to one side by the second changeover switch 52. To select MSD or HA with rotary switch MSD/HA captured, press the switch 5.
2 to the other T input. If switching is performed using this method, especially in the case of HA or MA, the hour or minute stage will advance by one each time the step is advanced, making adjustment operations easier. I mean,
This is because, in normal cases, the hour or minute stand continues to advance automatically during the switch-on period, which sometimes causes it to run too far beyond the desired stop position, making it difficult to make adjustments.

As explained above, according to the present invention, the number of input control switches can be reduced by up to half compared to the conventional one,
This makes panel operation easier, and since the input control switches connected to signal lines 13-1 and 13-2 are not dual-function switches according to the example in Fig. 4, new switches can be added if necessary. It is easy to combine these functions. However, the configuration of the changeover switch 43 must be changed.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a conventional channel selection device.
FIG. 2 is a circuit diagram showing a first embodiment of the channel selection device according to the present invention, FIG. 3 is a front view showing an example of the configuration of an operation panel when the channel selection device of FIG. 2 is used, and FIG. The figure is a circuit diagram showing a second embodiment of the channel selection device according to the present invention, and FIG. 5 is a diagram showing another example of the configuration of the changeover switch. In the figure, 11 is the digital control
IC, 12, 22, 42 are matrices,
13-1 to 13-4, 13-12, and 13-34 are horizontal signal lines, 14-1 to 14-4 are vertical signal lines, and 23, 43, 51, and 52 are changeover switches.

Claims (1)

[Claims] 1. A matrix is formed at the input part of a digital control IC that controls a frequency synthesizer type radio receiver, and a plurality of horizontal signal lines of the matrix are arranged in a phase direction for input control switch scanning. The plurality of vertical signal lines of the matrix transmit on/off information of the input control switch, and the input control switch is transmitted at each intersection of the horizontal and vertical signal lines. In a channel selection device including switches, each of the input control switches is set in advance to select at least two or more different types of input control information, and each of the horizontal signal lines is connected via a changeover switch. Any one of the plurality of time signals can be transmitted, and which input control information is selected by each input control switch is determined by switching the changeover switch.
A channel selection device characterized in that the channel selection is carried out by transmitting one desired time signal to a corresponding one of the horizontal signal lines. 2. The device according to claim 1, wherein the changeover switch is composed of a single circuit changeover switch and selectively selects the time signal to be transmitted to any one of the horizontal signal lines. 3. The changeover switch is composed of a two-circuit changeover switch, and the time signal to be transmitted to any two of the horizontal signal lines is selectively selected from the two on each signal line. equipment. 4 Claims 2 or 3 in which the changeover switch is a non-locking momentary switch
The device described in any of the paragraphs. 5 The always-on contact in the changeover switch is
5. The device according to claim 4, which passes a frequently used time signal. 6. The changeover switch has a first rotary switch and a second rotary switch that are interlocked, a first changeover switch whose contact point is switched according to the rotational direction of the first and second rotary switches, 2. The device according to claim 1, further comprising a second changeover switch that applies an arbitrary time signal to the common contact of the first changeover switch.