JPH01108820A - Compact disk player with electronic tuning radio set - Google Patents

Abstract

PURPOSE:To improve the operability and space factor by using a 1st switch and a 2nd switch for a feeding switch and a returning switch of a playing music number of a compact disk player respectively. CONSTITUTION:In selecting a function changeover switch S3 to the position of a radio receiver, a voltage is applied to a PLL operation on/off control terminal 12 and a PLL circuit 1 is in normal operation. Thus, the channel selection of the electronic tuning radio receiver is attained by the 1st and 2nd switches S1, S2 for setting a reception frequency connected to the circuit. In selecting a function switch S3 to the position of the CD player, a power is supplied to the channel control circuit 13 of the CD player side by the function switch S3 to operate the circuit 13. Thus, the 1st switch S1 and the 2nd switch S2 act like music selection switches. Thus, the operability and the space factor are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a composite electronic device that integrates an electronically tuned radio and a compact disc player (hereinafter referred to as a CD player) into one device.

(Prior Art) Conventionally, a radio and a CD player are integrated into one device, and a function switch is used to select either the audio from the radio or the audio from the CD player.
Composite electronic equipment is available on the market that produces sound from a commonly provided audio amplifier. Furthermore, in the above-mentioned composite electronic device, it can be easily proposed that radio tuning be electronically tuned.

On the other hand, conventional electronically tuned radios use a PLL frequency synthesizer circuit 1 as one local oscillator and a voltage controlled oscillator 2 as shown in FIG. 2 to control the local oscillation frequency.
is used. PLL frequency synthesizer circuit (hereinafter referred to as P
The LL circuit (abbreviated as LL circuit) 1 includes a crystal oscillator 4 that oscillates a constant frequency using a crystal 3, and this constant oscillation frequency is
The frequency is divided by a reference divider 5. This division ratio is given a constant value by the controller 6. The reference frequency after this frequency division is assumed to be f.

Next, the oscillation voltage having the frequency f oscillated by the voltage controlled oscillator 2 is applied to the programmable divider 7 of the PLL circuit, where it is frequency-divided. This frequency division ratio can be changed and set using a switch Sze switch S connected to the controller 6. For example, if it is set to 1/N, the output frequency of the programmable divider 7 will be f o /N.

The output of this programmable divider 7 and the output of the reference divider 5 mentioned above are applied to a phase comparator 8 and compared in frequency and phase, and this difference output is sent to a low-pass filter 9.
is applied to the voltage controlled oscillator 2 through the voltage controlled oscillator 2. Finally, f,
The oscillation frequency f of the voltage controlled oscillator 2 is controlled so that =f,/N. By pressing the switch S□, the division ratio N of the programmable divider 7 is increased in sequence, and by pressing the switch S3, N is decreased in sequence, then by pressing the switch S1, the reception frequency is increased,
By pressing the switch S2, the receiving frequency is selected to be low, thereby making it possible to select a channel.

In addition, a power supply terminal l that supplies power to each part of the PLL circuit 1 is provided.
Power is supplied to O through a backflow prevention diode D1. When the power is cut off, it is necessary to retain the information of the controller, etc., so a backup battery 11 is supplied to the power terminal 10 through a backflow prevention diode D2. However, if this continues, the switch S1. Alternatively, if the switch S2 is pressed, the information on the controller 6 changes, so a PLL operation on/off control terminal 12 is provided, and if the voltage applied to this terminal is high, it will operate normally, and if it is low, the signals of the switches S, , S, etc. The controller 6 does not accept this and does not perform PLL operation.

Next, FIG. 3 shows a conventional music selection control circuit for a CD player.

In FIG. 3, the switch S4 connected to the music selection control circuit 13 is for setting the song number that is larger than the currently performed song number (S is the one that is smaller). or S is pressed, the controller 14 outputs information to the tracking control circuit 15, and the tracking control circuit 15 drives the optical pickup 16 to fast forward mode. During this time, the optical pickup 16 reads the track number information (subcoding) recorded on the disc. Then, this read information is subjected to signal processing by the signal processing circuit 17, and the sub-coding detection circuit 1
Send to 8. With this sub-coding information, controller 1
4 judges whether it is the specified song number or not, and if it is the specified song number,
It acts on the tracking control circuit 15 to stop the fast forwarding of the optical pickup 16. The terminal 19 is a power supply terminal of the music selection control circuit 13.

(Problems to be Solved by the Invention) When the above-mentioned conventional electronically tuned radio and CD player are integrated into one device, operation switches for both are arranged, making operations difficult to understand and easy to make mistakes. .

It is impossible to listen to the radio and CD player at the same time. For example, when listening to the radio, the switches for selecting various functions on the CD player are inactive. Therefore, since there are unused switches, the space factor becomes worse.

In particular, it has the disadvantage that it is unsuitable when it is intended to be configured into a small device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a CD player with an electronically tuned radio that simultaneously improves the operability space factor.

(Means for Solving the Problems) A compact disc player with an electronically tuned radio according to the present invention provides: - a PLL frequency synthesizer circuit of the electronically tuned radio and a tune selection control circuit of the compact disc player, each connected to a PLL frequency synthesizer circuit and a tune selection control circuit of the compact disc player; 1 switch, a second switch for reducing the radio reception frequency, the common terminal to the DC power supply, and the radio side terminal to the PLL function operation/non-operation control terminal of the PLL frequency synthesizer circuit.
A third switch for selecting a function for selecting a radio or a compact disc player is connected to the power supply terminal of the music selection control circuit at the terminal on the compact disc player side, and the first switch and the second switch are connected to the compact disc. It is constructed so that it can be used as a switch for forwarding and reversing the playback number of a player.

(for production) In the CD player with electronic tuning radio of the present invention.

When the function selector switch is set to the radio side, P
A voltage is applied to the LL operation on/off control terminal, the PLL circuit enters normal operation, and the first and second switches for setting the reception frequency connected to this circuit enable tuning of the electronically tuned radio.

On the other hand, although the first switch and the second switch are also connected to the music selection control circuit of the CD player, the third switch (for switching functions) does not supply power to the music selection control circuit and does not function. , Therefore, the original function of the first switch and the second switch, which is radio station selection, is not affected.

Next, when the function switch is on the CD player side, no voltage is applied to the PLL operation on/off control terminal, so the first and second switches do not participate in the tuning function of the electronically tuned radio, and the PLL There is no influence from the circuit side.

On the other hand, the channel selection control circuit on the CD player side is supplied with power by the function switch and becomes operational. Therefore, the first switch and second switch connected thereto can act as a music selection switch.

(Example) The present invention will be described in detail below. FIG. 1 shows a main block diagram of a CD player with electronic tuning radio according to the present invention.

Components that are the same as those in FIGS. 2 and 3 described in the prior art section are given the same numerals and redundant explanations will be omitted.

The switch S1 and the switch S2 are connected to the controller 6 of the PLL circuit 1 through anti-reverse diodes D3 and D4, respectively, and at the same time, the anti-reverse diodes D, D,
It is also connected to the controller 14 of the music selection control circuit 13 through the music selection control circuit 13.

The switch S1 is a function changeover switch for selecting whether to listen to the radio or the CD player, and its common terminal is connected to the DC power source of the device. The radio side terminal of the switch S is connected to the PLL through the backflow prevention diode D.
It is connected to the power supply terminal 1O of the circuit 1, and at the same time, it is also connected to the PLL operation on/off control terminal 12 of the PLL circuit 1. When a high voltage is applied to this terminal 12, that is, when the common terminal of the switch S3 is connected to the radio side, the PLL circuit 1 performs normal PLL operation and receives the operations of the switch S□ and the switch S2. Attach. Conversely, when no voltage is applied to terminal 12, that is, switch S
When the common terminal of , is on the CD player side, the PLL circuit 1 stops the PLL operation, does not accept the operation of the switch S1 and the switch S2, and the information of the controller 6 is held.

On the other hand, the CD player side terminal of the switch S is connected to the power supply terminal 19 of the music selection control circuit 13.

When function switch S is on the radio side, PL
L circuit 1 performs normal operation, and by pressing switch S1, the reception frequency can be changed to a higher side (UP), and conversely, by pressing switch S2, it can be changed to a lower side (DOWN). At this time, switch S1 and switch S2 is connected to the music selection control circuit 13 of the CD player, but power is not supplied to it, so there is no influence from the controller 14.

Next, when the function switch S is on the CD player side, power is supplied to the power terminal of the song selection control circuit 13 of the CD player, so it becomes operational, and if you press the switch S1, you can select a song with a higher number than the currently played song. It can be set and changed as desired.

Conversely, by pressing switch S2, the song number is set to the lower one.
Can be changed. At this time, the PLL operation of PLL circuit 1 is turned on.
No voltage is applied to the off control terminal 12, and the controller 6
is not affected by switch S2 and switch S3, and does not affect switch S1 and switch S,
In this way.

When the function switch S1 is on the radio side, the switch S1 and the switch S2 function for receiving frequencies <UP> and <DOWN> of the electronically tuned radio, respectively.
When the switch S is on the CD player side, the switch S1 and the switch St function respectively for selecting, forwarding, and returning tracks of the CD player.

Furthermore, to improve the space factor, the display can be used as both a radio and a CD player.

That is, by switching the function switch S3, the selected frequency of the radio or the selected song number of the CD player is displayed on the display (not shown), and by moving the switch S1 and the switch S3, the displayed frequency or song number can be increased or decreased. You can also make it possible.

(Effects of the Invention) As described above, according to the present invention, by simply selecting a function switch, when the same switch selects radio, the receiving frequency is
When selecting a player, it can be used for forwarding (or forwarding) the selection of songs, so the number of switches can be reduced.
The space factor can be improved.

Further, according to the present invention, when operating the switch, although there are differences in frequency and song number, the operating concept of changing the numerical value is the same, so there is no strange feeling and the operability is improved.

Furthermore, according to the present invention, the advantages of the present invention can be further increased by displaying the reception frequency and the song number in the same display.

In addition, according to the present invention, the function switch includes:
To select the audio signal of the radio and the audio signal of the CD player and input them into a common audio amplifier.

An audio amplifier was originally required. Therefore, since the CD player circuit is simply added to the radio circuit,
The space factor can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a CD player with an electronically tuned radio according to the present invention, FIG. 2 is a block diagram of main parts of a conventional electronically tuned radio, and FIG. 3 is a song selection diagram of a conventional CD player. FIG. 2 is a block diagram of a control circuit. l...PLL frequency synthesizer circuit, 13...
Music selection control circuit, Sz*Sx*5itS4. S...Switch, 12...PLL operation on/off control terminal, 6
, 14...controller, Dl-Ds-D=-Dl-DI-
DI...Diode, 11...Backup battery. Figure 1 Figure 2 D2 DI
Denkumi Figure 3

Claims (2)

[Claims] (1) The first switch for increasing the radio reception frequency, the second switch for decreasing the radio reception frequency, and the common terminal connected to the PLL frequency synthesizer circuit of the electronically tuned radio and the music selection control circuit of the compact disc player are connected to a DC power supply. Then, the radio side terminal is connected to the PLL function operation/non-operation control terminal of the PLL frequency synthesizer circuit,
A third switch for selecting a function for selecting a radio or a compact disc player is connected to the power supply terminal of the music selection control circuit at the terminal on the compact disc player side, and the first switch and the second switch are connected to the compact disc. A compact disc player with an electronically tuned radio, characterized in that it is configured to be used as a switch for forwarding and returning a song number to be played on the player. (2) The compact with an electronically tuned radio according to claim (1), wherein the first to third switches are connected to a single display that is displayed according to the operation thereof. disc player.