JPS62277686A - Compact disk player with tuner - Google Patents

Abstract

PURPOSE:To use a display part for reception frequencies, etc., and the display part for reproduction time, etc. of a CD reproduction circuit in common, by using a display part which is controlled by the signal inputted from a 2nd microcomputer and a changeover switch which supplies the switch signal to the 1st microcomputer. CONSTITUTION:A tuner microcomputer 22 monitors the operating state of each switch, therefore can discriminate whether a tuner/CD player changeover switch 27 is connected to a tuner or a CD player to perform the processing changeover in response to the result of said decision. While a CD player microcomputer 24 is controlled by the data received from the microcomputer 22, therefore receives the input of the transfer data including the data on the connection state of the switch 27. Then the microcomputer 24 can decide the processing changeover. As a result, those three types of working states can be displayed on a single display part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a compact disc player with a tuner, which is a compact disc player with a tuner function added thereto.

2. Description of the Related Art Conventionally, this type of compact disc player with a tuner has a configuration as shown in FIGS. 6 and 7. In FIG. A CD player microcomputer that controls the CD playback circuit; 3 a group of CD player operation switches that give commands to the CD player microcomputer 2; 4 a CD player display unit that receives instructions from the CD player microcomputer 2 and displays playback time, etc. , 6 is an AM receiving circuit, 6 is an FM receiving circuit, 7 is an AM receiving circuit
A tuner operation switch group 8 for operating the receiving circuits and the FM receiving circuit 6 is a dial-type tuner display unit that displays the FM receiving circuit 6 and the tuning frequency of the FM receiving circuit 6.

Another possible configuration is shown in FIG. That is, the components indicated by numerals 1 to 4 are the same as the configuration of the conventional example described above, 9 is a tuner reproducing circuit, 10 is a tuner microcomputer that controls the tuner reproducing circuit 9, and 11 is a system that gives commands to the tuner microcomputer 10. Is the tuner operation switch group 12 instructed by the tuner microcomputer 10? The receiver is a tuner display section that displays the reception frequency, etc., and the numeral 13 is a changeover switch that switches between the CD player and the tuner.

Problems to be Solved by the Invention However, the above conventional configuration has the following problems.

That is, two display sections, a tuner display section and a CD player display section, are required, and especially in portable CD players, the display section occupies a considerable space, making it difficult to miniaturize.

The present invention has been made to solve the above-mentioned conventional problems, and includes a display unit that displays the reception frequency of the tuner, etc.
The purpose of this invention is to double the display section for displaying the reproduction time and the like of the D reproduction circuit so that the display can be displayed on one display section.

Means for Solving the Problems In order to achieve the above object, the present invention includes the following means. That is, the present invention includes a first reproducing circuit, a first microcomputer that controls the eleventh reproducing circuit, and receives a signal representing the reproducing state of the first reproducing circuit;
a group of operation switches connected to the first microcomputer and inputting operation signals to the first microcomputer; a second microcomputer inputting signals output from the first microcomputer;
a second reproduction circuit controlled by the microcomputer; a display section controlled by a signal output from the second microcomputer; and a display section connected to the first microcomputer and switched to the first microcomputer. It is equipped with a changeover switch for inputting a signal.

For production The effects of the present invention using the above means are as follows.

That is, the first microcomputer controls the first reproducing circuit based on the operation signal inputted to the first microcomputer from the operation switch group, and receives a signal representing the reproducing state of the first reproducing circuit.

Further, the first microcomputer outputs a signal to the next second microcomputer, and the second microcomputer that inputs this output signal controls the second reproducing circuit and also controls the second reproducing circuit. A signal indicating the playback status is received, and the first . This displays the reproducing state of the second reproducing circuit.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, 21 commands the reception frequency of the tuner,
9 for commanding FM/AM switching, or a group of operation switches 2 for commanding the playback order of songs on a CD player;
Reference numeral 2 denotes a tuner microcomputer into which operation signals are input from the operation switch group 21; 23 a tuner reproducing circuit controlled by the tuner microcomputer 22;
4 is a CD player microcomputer controlled by the signal output from the tuner microcomputer 22, 2s is a CD playback circuit controlled by the CD player microcomputer, 26 is a display section controlled by the CD player microcomputer 24, and 27 is a This switch is connected to the tuner microcomputer and inputs a switching signal between the tuner and the CD player to the tuner microcomputer 22.

The operation of one embodiment of the present invention configured as above will be explained. When the tuner microcomputer is powered on, it monitors the operating states of the operation switch group 21 and changeover switch 27, and scans the switch keys in order to accept switch inputs to the switch group 21 and changeover switch 27.

Now, assuming that the changeover switch 27 is connected to the tuner side, the tuner microcomputer 22 receives operation signals from the operation switch group 21 and controls the tuner regeneration circuit 23 accordingly.
It receives a signal regarding the playback state of the tuner playback circuit 23 from the tuner playback circuit 23 and creates display data such as reception frequency to be displayed on the display unit 26. Tuner microcomputer 22
The display data created is transferred to the next CD player microcomputer 24, and the CD player microcomputer 24 outputs the transferred display data to the display section 26 for display.

Next, assuming that the changeover switch 27 is connected to the CD player side, the tuner microcomputer 22 receives the operation signal from the operation switch group 21, and the receiver inputs the operation signal attached and the changeover signal from the changeover switch 27 to the switch. CD player microcomputer 24 as data
Transfer to.

The CD player microcomputer 24 receives the transferred switch input data and controls the CD playback circuit 26 in accordance with the operation signals from the operation switch group 21.
Receives a signal regarding the playback status of the CD playback circuit 25 from the CD playback circuit 26, creates display data such as playback time to be displayed on the display unit 26, and outputs it to the display unit 26;
indicate.

The above operations can be summarized as shown in Table 1.

Table 1 Here, the processing within each microcomputer differs depending on whether the selector switch 27 is connected to the tuner side or the CD player side. The switching is determined as follows. First, the tuner microcomputer 22 scans the switch keys of the operation switch group 21 and the changeover switch 27 and monitors the operating status of each switch. It is possible to easily determine whether it is connected to the tuner side or the CD player side, and the processing can be switched accordingly.

Furthermore, since the CD player microcomputer 24 is controlled by the data transferred from the tuner microcomputer 22, data regarding the connection state of the changeover switch 27 is included in the data transferred from the tuner microcomputer 22, and the transferred data is By inputting this into the CD player microcomputer, the CD player microcomputer can determine whether to switch the processing.

FIG. 2 shows an example of the display form of the display section 26 according to this embodiment, and FIG. This is an example of the situation, and shows that the 12th song is currently being played and 66 minutes and 39 seconds have passed since the start of playback. (in the figure) is an example of the display section when the changeover switch 27 is connected to the tuner side, that is, when used as a tuner, and shows that AM frequency 1629 KHz is currently being received. Similarly, (C) in the same figure shows that the FM frequency of 106.75 MHz is currently being received. As described above, according to this embodiment, a single display section can display three types of states: when used as a CD player, when used as an AM tuner, and when used as an FM tuner.

Further, the tuner microcomputer 22 processes the operation signals from the operation switch group 21 differently depending on the connection state of the changeover switch 27, thereby combining the tuner operation switch group and the CD player operation switch group into one operation switch group. It is possible to combine the functions of That is, when the changeover switch 27 is connected to the tuner side, the operation signal from the operation switch group 21 is processed as an operation signal related to the tuner, and when the changeover switch 27 is connected to the CD player side, the operation signal from the operation switch group 21 is processed as an operation signal related to the tuner. By processing the operation signals from the operation switch group 21 as operation signals related to the CD player, one operation switch group can serve both the functions of the tuner operation switch group and the CD player operation switch group. FIG. 3 shows an example of a group of operation switches. As shown in the figure, one key in the operation switch group has two types of operation functions, and the tuner microcomputer determines the operation function of each key depending on the switching state of the changeover switch 27. The number of keys in a switch group can be halved.

FIG. 4 is a block diagram showing a second embodiment of the present invention, in which the tuner playback circuit and CD playback circuit are replaced in the first embodiment, and the tuner microcomputer and CD player microcomputer are replaced. The configuration is exactly the same as the first embodiment. Regarding the operation, the CD accepts the switch input which was done by the tuner microcomputer in the first embodiment.
This embodiment is exactly the same as the first embodiment except for what the player microcomputer performs on its behalf.

Next, the crystal oscillator that drives the tuner microcomputer 22 and the CD player microcomputer will be explained.

Generally, the tuner microcomputer 22 has 4 or 5 M
Driven by a crystal oscillator with an oscillation frequency of Hz, the microcomputer for the CD player has a frequency of 4.233Hz.
It is driven by a crystal oscillator with an oscillation frequency of 6 MHz, but when oscillating crystal oscillators with different oscillation frequencies, it is necessary to provide sufficient shielding from interference, especially in the tuner reproducing circuit 23 and CD reproducing circuit 25. A phenomenon occurs in which noise enters the audio circuit (beatdown). In order to solve such problems, a configuration as shown in FIG. 5 is effective.

That is, 31 is connected to the power supply line through an interlocking switch 32 that is turned on/off in conjunction with the changeover switch 27.
Crystal oscillator with oscillation frequency of 336 MHz, 33
is a 4 or 5 MHz signal connected to the power supply line via an interlocking switch 34 that is turned on/off in conjunction with the changeover switch 27.
A crystal oscillator having an oscillation frequency of
Fixed terminals are tuner microcomputer 22 and CD
It is connected to the player microcomputer 24, and the switching terminal is connected to the tuner side when the changeover switch 27 is connected to the tuner side, and connected to the CD player side when the changeover switch 27 is connected to the CD player side. .

Table 2 shows the connection relationship of each switch.

Table 2 With this configuration, when the changeover switch 27 is connected to the tuner side, the interlocking switch 32 is turned off, the interlocking switch 34 is turned on, and the interlocking switch 35 is connected to the tuner side, so that the 4.5MHz Only the crystal oscillator 33 having the oscillation frequency operates, and a 4.5 MHz pulse signal is applied to the tuner microcomputer 22 and CD player microcomputer 24 via the interlocking switch 36 to drive each microcomputer. Further, when the selector switch 27 is connected to the CD player side, the interlocking switch 32 is turned on.

Since the interlock switch 34 is turned off and the interlock switch 35 is connected to the CD player side, only the crystal oscillator 31 with an oscillation frequency of 4.2336 MHz operates, and the tuner microcomputer 22 and the CD microcomputer are connected via the interlock switch 36. A 4.2336 MHz pulse signal is applied to 24 to drive each microcomputer.

Note that when the selector switch 27 is connected to the tuner side, C
D player microcomputer 24 also has 4.5MH
z pulse signal is applied, but as shown in Table 1, when the selector switch 27 is connected to the tuner side, that is, when used as a tuner, the CD player microcomputer 24 controls the CD reproducing circuit 25. Since it only outputs display data to the display unit 26 instead of displaying data, it operates without any problem. Also, when the selector switch 27 is connected to the CD player side, the tuner microcomputer 2
A 4.2336 MHz pulse signal is also applied to the tuner microcomputer 22, but as shown in Table 1, when the selector switch 27 is connected to the CD player side, that is, when used as a CD player, the tuner microcomputer 22 performs tuner playback. Since the circuit 23 is not controlled and only receives the switch input, it operates without any problem.

In this manner, only one crystal oscillator out of a plurality of crystal oscillators having different oscillation frequencies is operated by switching the changeover switch 27, so that beatdown can be reliably prevented.

As described above, according to this embodiment, the following various effects can be obtained.

(1) Data is transferred from one microcomputer to the next microcomputer, and the next microcomputer controls one display, so a compact disc player with a tuner can be used as a CD player or an AM
tuner.

When used as an FM tuner, displays corresponding to each function can be displayed on a single display section, and the display can also be used.

(2) Processing for switch input in the microcomputer is different depending on the connection state of the selector switch, so a compact disc player with a tuner can be
When used as a D player, AM tuner, or FM tuner, the operation as a CD player, AM tuner, or FM tuner can be performed with only one operation switch group without providing separate operation switch groups for each case.

(3) When operating one crystal oscillator,
Since all the microcomputers are driven by pulse signals from the crystal oscillator which is in oscillation mode while other crystal oscillators are stopped, beatdown can be reliably prevented.

In the above embodiment, two microcomputers are installed separately.
I used these tuner microcomputers,
A single microcomputer may have the functions of a compact disc player microcomputer.

Effects of the Invention As is clear from the embodiments described above, the present invention includes a first reproducing circuit and a first microcomputer that controls the first reproducing circuit and receives a signal representing the reproducing state of the first reproducing circuit. a group of operation switches connected to the first microcomputer and inputting operation signals to the first microcomputer; and a second microcomputer inputting signals output from the first microcomputer.
a second reproduction circuit controlled by the second microcomputer; a display section controlled by a signal output from the second microcomputer; Therefore, according to the present invention, whether the tuner compact disc player is used as a tuner or as a compact disc player, one Since the display section can display information according to its function and the volume occupied by the display section can be halved, this is extremely effective in a portable compact disc player with a tuner.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a compact disc player with a tuner according to an embodiment of the present invention, Fig. 2 is a front view showing the display state of the display section of the player, and Fig. 3 is a front view of the operation switch group of the player. 4 is a block diagram of another embodiment of the present invention, and FIG. 6 is a block diagram showing the relationship between the microcomputer and crystal oscillator of the same player.
The figure is a block diagram of a conventional example, and FIG. 7 is a block diagram of another conventional example. 21... Operation switch group, 22... Tuner microcomputer, 23... Tuner playback circuit, 24... CD player microcomputer/computer, 25... ...CD playback circuit, 26...
... Display section, 27 ... Selector switch. Toshio Tsuchinakao and 1 other figure 1 figure 2 figure 2 FM time reception M number figure 4 pukyo switch
zbFigure 5

Claims (4)

[Claims] (1) a first reproducing circuit; a first reproducing circuit that controls the first reproducing circuit and receives a signal representing the reproducing state of the first reproducing circuit;
a microcomputer, a group of operation switches connected to the first microcomputer and inputting operation signals to the first microcomputer, and a second microcomputer inputting signals output from the first microcomputer. , a second reproducing circuit controlled by the second microcomputer, a display section controlled by a signal output from the second microcomputer, and a first reproducing circuit connected to the first microcomputer. A compact disc player with a tuner and a changeover switch that inputs a changeover signal to a microcomputer. (2) The compact disc with tuner according to claim 1, wherein the first microcomputer processes the operation signals input from the operation switch group differently depending on the switching signal input from the changeover switch. player. (3) A compact disc player with a tuner according to claim 1 or 2, wherein the first microcomputer is a tuner microcomputer and the second microcomputer is a compact disc player microcomputer. (4) A compact disc player with a tuner according to claim 1 or 2, wherein the first microcomputer is a compact disc player microcomputer, and the second microcomputer is a tuner microcomputer.