JPH0115232Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a frequency synthesizer receiver in which a station name display board is inserted to select a preset station.

In this type of frequency synthesizer receiver, frequency division ratio data to be supplied to a variable frequency divider constituting a part of the frequency synthesizer is stored in advance in a storage device in correspondence with a plurality of stations listed on a station name display board. By pressing the preset station selection switch provided corresponding to the station name on the inserted station name display board, the frequency division ratio data for the station corresponding to the preset station selection switch is supplied from the storage device to the variable frequency divider. The configuration is such that the preset station is selected and received.

Such conventional frequency synthesizer receivers are configured so that a station name display board can be inserted and the station name written on the inserted station name display board can be seen from the front of the receiver. A preset station selection switch is provided corresponding to the selected station name.

For this reason, in conventional frequency synthesizer receivers of this type, when the number of preset stations is increased, the length of the station name display board becomes longer, and the number of preset station selection switches also increases. The disadvantages are that the volume, especially the surface area, of the material increases, and the cost also increases.

The present invention has been made in view of the above, and it is an object of the present invention to provide a frequency synthesizer receiver that eliminates the above-mentioned drawbacks.

The present invention will be explained below with reference to examples.

Figures 1a and 1b are front and side views of a frequency synthesizer receiver that allows presetting, and a through hole 1 for inserting a station name display plate is provided on the side. The station name display plate inserted through the through hole 1 is guided by a guide member (not shown) provided inside the receiver and is slid into the receiver.
On the other hand, the station name written on the inserted station name display board,
Further, windows 2 are provided in the front of the receiver at predetermined intervals so that the symbol or its abbreviation can be seen from the front of the receiver. A preset station selection switch 3 is provided corresponding to the window 2.

On the other hand, FIG. 2 is a block diagram showing a part of a frequency synthesizer receiver according to an embodiment of the present invention.
In Fig. 2, 4 indicates an antenna, 5 a high frequency stage that amplifies the output of the antenna 4, and 6 mixes the output of the high frequency stage 5 with the output of a frequency synthesizer A consisting of a PLL circuit and converts it into an intermediate frequency. A mixing stage, 7 is an intermediate frequency amplification stage that selectively amplifies the intermediate frequency signal output from the mixing stage 6, 8 is a demodulation stage that demodulates the output of the intermediate frequency amplification stage, and 9 is a stereo demodulation of the composite signal output from the demodulation stage 8. The multiplex stage shown here constitutes a frequency synthesizer type FM stereo tuner.

On the other hand, frequency synthesizer A includes a reference frequency oscillator 10 and a voltage controlled oscillator (hereinafter referred to as VCO).
11. A variable frequency divider 12 that divides the output frequency of the VCO 11, and a phase comparator 1 that compares the phases of the output of the variable frequency divider 12 and the output of the reference frequency oscillator 10.
3. Take the output of the phase comparator 13 as input and the output as
The low pass filter 14 supplies the signal to the VCO 11 and controls the output frequency of the VCO 11. By setting the frequency division ratio of the variable frequency divider 12, the output frequency of the VCO 11, that is, the frequency output to the mixing stage 6, is set, and a broadcasting station is selected and received.

On the other hand, 3A to 3F are preset station selection switches provided corresponding to window 2, and 3A, 3B, . . . correspond sequentially from the left side in FIG.

In addition, 15-1 and 15-2 are variable frequency dividers 1
This is a storage device (hereinafter simply referred to as memory) in which frequency division ratio data for setting a frequency division ratio of 2 is stored. Reference numeral 16 denotes a station name display board identification circuit, which will be described later, and includes a drive circuit 16- in the station name display board identification circuit 16.
The output from memory 15-1 and memory 15-2 is configured to switch and drive a switch circuit 17 that switches between the outputs of memory 15-1 and memory 15-2 and leads them to variable frequency divider 12.

Further, addresses corresponding to the preset station selection switches 3A...3F are set in the memories 15-1 and 15-2, and the addresses corresponding to the preset station selection switches 3A,
..., 3F, the division ratio data stored in the address corresponding to the pressed preset station selection switch 3A, ..., 3F is transferred to the memory 15-3F.
1 and 15-2.

Figures 3a and 3b show the front and back sides of a station name display board used in an embodiment of the present invention.

For example, as shown in FIG. 3A, the station name display board 18 has a notch at one end, and a protrusion 18-1 is provided so that the position of the station name display board 18 is different when the station name display board 18 is turned upside down. Through holes 18-2 are formed of a plate-like rectangular insulator having a preset station selected at predetermined intervals, and are provided at the top and bottom of the station name display board 18 for passing the light of the light emitting diode corresponding to the selected preset station. are arranged on the center line of.
Further, an abbreviation or symbol of the preset station name is written near the through hole 18-2. In addition, station name display board 1
Similarly, on the back side of 8, abbreviations or symbols of other preset station names are written near the through hole 18-2. It goes without saying that the respective station name symbols or abbreviations written on the front and back sides of the station name display board 18 and the through holes are provided corresponding to the windows 2.
Note that the station name display board may be turned over so that the left and right sides are reversed.
It will look like this. In this case, the through hole 18-2 may be provided on an appropriate line parallel to the upper and lower center lines of the station name display board 18. Furthermore, if the front and back sides of the station name display board are made in different colors, it is convenient to know at a glance which side is in use.

On the other hand, FIG. 4 is an explanatory diagram of the configuration of an example of the station name display board identification circuit.

The station name display board identification circuit 16 consists of an insulating plate 19 and a pair of plate-shaped elastic conductors 20 whose ends are fixed to both sides of the insulating plate 19. The plate-shaped elastic conductors 20 normally come into contact with each other due to their elasticity. ing. Further, the width of the plate-shaped elastic conductor 20 is set to be approximately equal to the width of the protrusion 18-1 on one end side of the station name display board 18. Contact or non-contact of the plate-shaped elastic conductor 20 is configured to be detected by a station name display board identification circuit 16.
Further, the drive circuit 16-1 is configured to switch the switch circuit 17 depending on whether the plate-shaped elastic conductor 20 is in contact or not.

Therefore, as shown in FIG. 4a and b, when the station name display board 18 is inserted into the receiver so that the surface of the station name display board 18 is on the window 2 side, the station name display board 1
The protrusion 18-1 of No. 8 is inserted between the plate-like elastic conductors 20 to space them apart.

Therefore, the drive circuit 16-1 includes the plate-like elastic conductor 20
The switch circuit 1 detects that the distance between the
7 to switch the switch circuit 17 to the memory 15-1 side, for example. In addition, when the station name display board 18 is inserted upside down and inserted into the receiver so that the back side of the station name display board 18 faces the window 2 as shown in FIGS. 5a and 5b, the station name display board 18 protruding part 1
8-1 is located at a position apart from the plate-shaped elastic conductor 20, and the plate-shaped elastic conductors 20 are not separated from each other,
Stay connected. Therefore, the drive circuit 16
-1 detects that the plate-shaped elastic conductor 20 is in contact, drives the switch circuit 17, and switches the switch circuit 17 to the memory 15-2 side.

Next, returning to FIG. 2, the contents stored in the memories 15-1 and 15-2 will be explained. memory 1
5-1 stores frequency division ratio data necessary for receiving the broadcast of the station name written on the front side of the station name display board 18, and its correspondence with the address is shown on the left side in Fig. 3a. Frequency division ratio data corresponding to the broadcast frequencies of the station names written from 1 to 3 are stored in addresses corresponding to the preset station selection switches 3A, . . . , 3F, respectively. Similarly, the memory 15-2 stores frequency division ratio data necessary for receiving the broadcast of the station name written on the back side of the station name display board 18.
The frequency division ratio data corresponding to the broadcast frequencies of the station names listed from the left in FIG. 3B are stored in addresses corresponding to the preset station selection switches 3A, . . . , 3F, respectively.

Therefore, if the station name display board 18 is inserted so that its front side faces the window 2, the symbol or abbreviation of the station name written on the surface of the station name display board 18 will be visible through the window 2. become. At the same time, the station name display board identification circuit 16 detects that the front side of the station name display board 18 is selected based on the position of the protrusion 18-1 of the station name display board 18, and its drive circuit 16-
1 switches the switch circuit 17 so that the output of the memory 15-1 is supplied to the variable frequency divider 12.

Therefore, the preset station selection switch 3A, . . .
By pressing F, the frequency division ratio data stored in the address corresponding to the pressed preset station selection switch 3A, . . . or 3F is output from the memory 15-1. Therefore, it is possible to receive the broadcast of a desired preset station from among the preset stations written on the front surface of the station name card 18.

Conversely, if the station name display board 18 is inserted with the front and back sides reversed, the station name or its symbol or abbreviation written on the back side of the station name display board 18 will be visible through the window 2. At the same time, the protrusion 18-1 of the station name display board 18
Based on the position, the station name display board identification circuit 16 detects that the back side of the station name display board 18 is selected,
The drive circuit 16-1 switches the switch circuit 17 so that the output of the memory 15-2 is supplied to the variable frequency divider 12.

Therefore, the preset station selection switch 3A, . . .
By pressing F, the frequency division ratio data stored in the address corresponding to the pressed preset station selection switch 3A, . . . or 3F is output from the memory 15-2. Therefore, it is possible to receive the broadcast of a desired preset station from among the preset stations listed on the back side of the station name display board 18.

As described above, in one embodiment of the present invention, a protrusion 18-1 is provided at one end of the station name display board 18, and the position of the protrusion 18-1 can be changed in the width direction by turning the front and back sides of the protrusion 18-1. Although the front and back sides of the inserted station name display board 18 have been detected by detecting the front and back sides of the inserted station name display board 18, other methods may be used to detect the front and back sides of the station name display board 18.

In addition, since the front and back sides of the station name display board can be detected, if both the front and back sides of the station name display board can be used and the same number of preset stations as the conventional number of preset stations can be selected, the station name display board The length of the station name display board is approximately 1/2 of the conventional station name display board, and the number of preset station selection switches 3 is reduced to 1/2 of the conventional station name display board.
The surface area of the receiver will also be reduced.

FIGS. 6a and 6b are plan views showing a station name display board used in another embodiment of the present invention.

FIGS. 6a and 6b are a surface view of the first station name display board 18A and a surface view of the station name display board 18B in FIG. 2, and one end of the first and second station name display boards 18A and 18B. On each side, a protrusion 18A-1 is provided at a position that is different when the front and back sides are turned upside down and does not overlap on the first and second station name display boards 18A and 18B. and 18B-1 are provided, respectively.

FIG. 7a is a block diagram showing the main parts of a frequency synthesizer receiver according to another embodiment of the present invention using the station name display board shown in FIG. 6.

The memories 15-3 and 15-2 store the frequency division ratio data for setting the frequency division ratio of the variable frequency divider 12, instead of the memories 15-1 and 15-2.
It is divided into four groups such as 4, 15-5 and 15-6, and the memory 15-3 has the first
The frequency division ratio data for receiving the broadcast of the station name written on the surface of the station name display board 18A is stored in the memory 15-4.
The memory 15-5 contains frequency division ratio data for receiving the broadcast of the station name written on the back side, and the frequency division ratio data for receiving the broadcast of the station name written on the front side of the second station name display board 18B is stored in the memory 15-5. Frequency ratio data is stored in the memory 15-6, and frequency division ratio data for receiving broadcasts of the station names written on the back side are stored respectively. Also, preset station selection switches 3A,...3F, memory 15-
The correspondence relationship between the division ratio data stored in the addresses 3 and 15-6 and the corresponding station names is set in the same way as in the embodiment of the present invention, and the preset station selection switch When is pressed, the stored frequency division ratio data in the address corresponding to the pressed preset station selection switch is stored in memories 15-3 to 15-1.
It is configured so that it is output from 6.

On the other hand, the station name display board identification circuit 16A is an identification circuit that detects the front and back sides of the first and second station name display boards 18A and 18B, and a decoder 16 that decodes the outputs of the detection circuit 16B and the detection circuit 16B.
C, the output of the decoder 16C is input and the output of the memory 15-3, 15-4, 15-5, 15-6 is switched, and the memory 15-3, 15-4, 15
A drive circuit 1 that drives a switch circuit 17A that supplies the output of -5 or 15-6 to the variable frequency divider 12.
It consists of 6D. The detection circuit 16B includes light emitting elements 2 arranged at predetermined intervals as shown in FIG. 7b.
3A, 23B, 23C and 23D and light emitting element 2
Light receiving elements 24A to 24D facing 3A to 23D
It consists of a photodetector consisting of light emitting elements 23A~
Projections 18A-1 and 18B-1 of the first and second station name display plates 18A and 18B inserted into the receiver between 23D and the light receiving elements 24A to 24D
By detecting the position of the station name display board 18A-1, the front and back of the first station name display board 18A-1 and the front and back of the first station name display board 18B-1 are detected.

That is, for example, the first station name display board 18A-1
is inserted, and when the front side faces the window 2, the light from the light emitting element 23A is blocked by the protrusion 18A-1, and when the back side faces the window 2, the light from the light emitting element 23D is blocked by the protrusion 18A. -1 blocks light. Also, a second station name display board 18B is inserted,
When the front side faces the window 2, the light from the light emitting element 23B is blocked by the protrusion 18B-1, and when the back side faces the window 2, the light from the light emitting element 23C is blocked by the protrusion 18B-1. be done. Therefore, the type of station name display board inserted into the receiver and its front and back are detected by the output of the detection circuit 16B.

On the other hand, the output of the detection circuit 16B is sent to the decoder 16C.
The signal is input to the switch circuit 17A via the drive circuit 16D. For example, when the first station name display board 18A is inserted and its front side faces the window 2, the switch circuit 17A
selects memory 15-3, and when the back side faces window 2, switch circuit 17A selects memory 15-3.
-4 is selected and the second station name display board 18B is inserted, and its front side faces window 2, the switch circuit 17A selects memory 15-5, and its back side faces window 2. When the memory 15-6 is present, the switch circuit 17A selects the memory 15-6.

Therefore, by inserting the first station name display board 18A or the second station name display board 18B into the receiver, the type of the inserted station name display board and its front and back can be detected. The preset station selection switch operates in the same manner as in the previous case, and the preset station selection switch allows reception of a desired preset station.

Therefore, in another embodiment of the present invention, by using two station name cards, even if the number of preset stations is doubled compared to the conventional one, the length of the station name display boards 18A and 18B is still the same as that of the conventional station name display board. The length will be reduced to 1/2, and the number of preset station selection switches will be reduced to 1/2.

As explained above, according to the present invention, since the station name display board identification circuit is provided to identify the display on the station name display board, and the memory is switched depending on the front and back of the station name display board, the station name display Since both the front and back sides of the board can be used, the length of the station name display board can be shortened even if there are a large number of preset stations, and the number of preset station selection switches can also be reduced.

The volume, in particular the surface area, of the receiver can thus be reduced.

Moreover, the preset function is not impaired because of this.

[Brief explanation of the drawing]

FIGS. 1a and 1b are a front view and a side view of a frequency synthesizer receiver configured to allow insertion of a station name display board. FIG. 2 is a block diagram showing a part of a frequency synthesizer receiver in an embodiment of the present invention. FIGS. 3a and 3b are front and back views of a station name display board used in an embodiment of the present invention. 4 and 5 are configuration explanatory diagrams of the station name display board identification circuit, and FIGS. 4a and 4b are a plan sectional view and a front view when inserted with the front surface of the station name display board. , FIGS. 5A and 5B are a plan view and a front view when the station name display board is inserted with the back side facing the front. FIGS. 6a and 6b are surface views of first and second station name display boards used in another embodiment of the present invention. FIG. 7a is a block diagram showing the main parts of another embodiment of the present invention. FIG. 7b is an explanatory diagram of a detection circuit constituting the station name display board identification circuit in another embodiment of the present invention shown in FIG. 7a. FIGS. 8a and 8b are front and back views of another station name display board used in one embodiment of the present invention. A...Frequency synthesizer, 3, 3A, 3B,
...3F...Preset station selection switch, 12...
Variable frequency divider, 15-1, 15-2,...15-6...
...Memory, 16 and 16A...Station name display board identification circuit, 17 and 17A...Switch circuit, 1
8, 18A and 18B... Station name display board.

Claims (1)

[Scope of utility model registration request] A station name display board for displaying preset station names is configured to be insertable, and a plurality of different preset station names are written on the front and back sides, respectively, and the number of preset stations is written on one side of the station name display board. and a first memory storing frequency division ratio data for the preset stations written on one side of the station name display board at addresses corresponding to the preset station selection switches, respectively. a second storage device storing frequency division ratio data for the preset stations written on the other side of the station name display board at addresses corresponding to the preset station selection switches; A station name display board identification circuit that identifies the front and back sides of a station name display board, frequency division ratio data output from the first storage device based on the output of the station name display board identification circuit, and the second storage device. 1. A frequency synthesizer receiver comprising at least a switch circuit that selects output frequency division ratio data and supplies the selected frequency division ratio data to a variable frequency divider of a frequency synthesizer.