JP2533600Y2 - Audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an audio device, and more particularly, to an audio device that selects and plays a predetermined recording medium from a magazine in which a plurality of recording media are stored.

<Prior Art> There is a recording medium playing device with an auto-change function for storing a plurality of recording media such as CDs (compact disks) or cassette tapes in a magazine, taking out a desired recording medium from the magazine, and playing. According to the recording medium playing apparatus with the auto change function, if a desired recording medium is designated by a number, the recording medium can be taken out of the magazine and set in a CD playing section to reproduce an audio signal.

<Problem to be Solved by the Invention> By the way, the audio signal reproduced by the CD playing section of the recording medium playing device with the auto change function is amplified by an amplifier after the volume is adjusted inside or outside the recording medium playing device. Sound is output from the speaker.

Volume adjustment is usually done using an electronic volume,
The volume control unit controls the volume of the electronic volume according to the volume change operation of the volume up key or the down key.

However, in the case of a recording medium playing device with an auto-change function, it takes about several minutes from when a desired recording medium is designated to when the recording medium is set in the CD playing section and the performance starts, and during this time, the speaker output is required. Is muted, users who are unfamiliar with the operation will mistake the device for malfunction,
An operation such as increasing the volume may be performed.

At this time, when the performance of the recording medium starts, a loud sound is suddenly generated, and there is a problem that the user is surprised.

In view of the above, it is an object of the present invention to provide an audio device which does not generate a loud sound after the start of a performance even if a volume change operation is performed during replacement of a recording medium.

<Means for Solving the Problem> In the present invention, the above-mentioned problem is solved by the volume control unit at least from when a selective performance command is issued until the performance of the recording medium is started during non-performance of the recording medium. This is achieved by a volume control prohibition unit that prohibits volume control.

<Operation> According to the present invention, even if a volume change operation is performed from the time the selection performance command is issued until the performance of the recording medium is started, the volume change control is prohibited. As a result, during the conversion of the recording medium, even if the volume is increased carelessly, the performance starts at the previously listened volume, so that there is no surprise of unexpected loud sounds.

<Embodiment> Fig. 1 is a block diagram of a main part of an in-vehicle audio device according to the present invention, in which a compact disc (CD) is used as a recording medium to be selectively played.

In the figure, reference numeral 1 denotes a CD changer as a recording medium selection performance unit, 2 denotes a magazine in which a plurality of CDs are stored, 3 denotes a CD performance unit, and 4 denotes a CD set in the CD performance unit 12 of the magazine 2. An autochanger for returning to the original position or taking out a predetermined CD from the magazine 2 and setting it in the CD playing section 3;
Is the CD changer control section of the microcomputer configuration,
While communicating with a control unit 12 to be described later, the control unit 12 controls the autochanger 4 and the CD playing unit 3 according to the selected performance command, and outputs a performance start signal and a performance end signal to the control unit 12.

Reference numeral 6 denotes a car stereo unit, 7 denotes a tape playing unit, 8 denotes an audio switch for switching between an audio signal output from the CD changer 1 and an audio signal output from the tape playing unit 7, and 9 denotes a volume constituted by an electronic volume. Adjustment section, 10 is mute circuit, 11 is amplifier, 12
Is a control unit having a microcomputer configuration, and performs switching control for the audio switch 8, volume control for the volume adjustment unit 9, mute control for the mute circuit 10, output of a selected performance command to the CD changer 1, and the like.

Reference numeral 13 denotes a speaker provided on the output side of the car stereo unit 6, which outputs a sound based on an audio signal reproduced from a tape or a CD.

Reference numeral 14 denotes an operation unit, 14a denotes a CD mode key for turning on / off a CD playing mode, and 14b denotes a C for selecting a desired CD.
The D select key, 14c is a volume up key, and 14d is a volume down key.

FIG. 2 is a block diagram of the control unit 12 and 12a.
Is a mode setting section that sets the CD performance mode on / off,
12b is a switching control unit for performing switching control on the audio switch 8 in accordance with ON / OFF of the CD playing mode, and 12c is a switching control unit.
A mute control unit for muting the mute circuit 10 while the CD is not playing in the D playing mode, a volume control unit 12d for controlling the volume of the volume adjusting unit 9 in accordance with a variable volume operation, and 12e for the CD in the CD playing mode. A selection performance command generation unit which generates a selection performance command when a selection operation is performed and outputs the command to the CD changer 1;
A volume control prohibition unit that prohibits volume control by the volume control unit 12d until a performance start signal is input from the D changer 1.

The control section 12 and the CD changer control section 5 of the CD changer 1 are connected by a communication line 15.

FIGS. 3 and 4 are flow charts for explaining the operation of the control unit 12. FIG. 3 shows a main process, and FIG. 4 shows an interrupt process when a volume changing operation is performed. Fig. 5 is CD
5 is a flowchart illustrating the operation of the changer control unit 5;

Hereinafter, the overall operation of the audio apparatus of FIG. 1 will be described with reference to these flowcharts.

The CD playing mode has been turned off (flag CDF = 0) in advance, the audio switch 8 has been set to the tape side, the mute circuit 10 has been set to the mute off state, and the CD playing section 3 has the CD number 1
It is assumed that a CD is set.

When a tape is set in the tape playing section 7, an audio signal reproduced by the tape playing section 7 is inputted and amplified by an amplifier 11 via an audio switch 8, a volume adjusting section 9 and a mute circuit 10, and is amplified. The sound is output.

When the volume up key 14c is pressed to increase the volume, the control unit 12 generates an interrupt, and the volume control unit 12d firstly sets the current volume control inhibition unit 1 according to the flowchart of FIG.
Determine whether volume control is prohibited by 2f (step
201) Since the volume control flag A is 0 and the volume control is not prohibited, it is next determined whether or not the operation is for the volume up key 14c (step 202). Here, since YES, the volume control is performed on the volume adjusting unit 9 to increase the volume by one step (step 203). Similarly, when the volume up key 14c is pressed a plurality of times, the volume is increased by the number of times of pressing.

Conversely, when the volume down key 14d is pressed to decrease the volume, the volume control unit 12d does not currently prohibit the volume control by the volume control prohibition unit 12f (YES in step 201).
Then, it is determined whether the operation is for the volume up key 14c (step 202). Since NO, it is determined whether the operation is for the volume down key 14d (step 204).
Since it is S, volume control is performed on the volume controller 9 to reduce the volume by one step (step 205).

Thus, when listening to the tape performance, the user can freely change the volume.

When the CD performance mode key 14a is pressed to switch from tape performance to CD performance, the CDF is set to 0, and the mode setting unit 12a of the control unit 12 sets the CD performance mode to CDF = 1 (step in FIG. 2). 101-103).

Next, the switching control unit 12b performs switching control on the audio switch 8 to switch the switch to the CD side (step 104), and the mute control unit 12c performs mute-on control on the mute circuit 10 to mute the sound output. (Step 105).

This prevents noise from being output from the speaker 13 when the CD is not playing, such as during CD replacement, which will be described later.

Next, the control unit 12 waits for a CD selection operation (step 106). For example, when the “3” key of the CD select key 14b is pressed, the selected performance command
Selective performance command including D number "3" is sent to CD of CD changer 1.
Output to changer control unit 5 (step 10
7).

Then, the volume control prohibition unit 12f sets the volume prohibition flag A and prohibits the volume control of the volume control unit 13d (step 10).
8).

Thereafter, the control unit 12 waits for a performance start signal to be input from the CD changer 1 (step 109).

The CD changer control unit 5 waits for the input of a selected performance command according to the flowchart of FIG. 5 (step 30).
1) When a selected performance command is input from the control unit 12 of the car stereo unit 6 via the communication line 15, first,
It is determined whether the CD is currently being played (step 302). Since it is NO here, it is determined whether the CD number included in the selected performance command matches the CD currently set in the CD playing section 3 (step 30).
3).

Here, since the discs do not match, the CD changer control section 5 controls the auto changer 4 to return the CD set in the CD playing section 3 to a predetermined position of the magazine 2 and to remove the CD of the CD number "3" instead. To set it in the CD playing section 3 (step 304).

When the exchange of the CD is completed, the CD changer control section 5 outputs a performance start signal to the control section 12 of the car stereo unit 6 via the communication line 15 (step S1).
305), and causes the CD playing section 3 to start playing the CD (step 3).
06). When a CD performance is started, a reproduction signal is output from the CD performance section 3 to the car stereo unit 6.

When the CD number included in the selected performance command matches the CD set in the CD performance section 3, the CD changer control section 5 immediately proceeds to step 305 without performing the CD exchange control and performs the performance start signal. Is output (NO in step 303).

In the control unit 12 to which the performance start signal is input via the communication line 15, the mute control unit 12c controls the mute off of the mute circuit 10 (step 11 in FIG. 3).
0). As a result, the audio signal output from the CD changer 1 is input to the amplifier 11 via the audio switch 8, the volume adjuster 9, and the mute circuit 10, amplified there, and then output to the speaker 13 for sound output. .

Also, the volume control prohibition unit 12f to which the performance start signal is input
Sets the volume prohibition flag A to 0 and releases the volume control prohibition on the volume control unit 12d (step 111).

Since the volume control is prohibited from the issuance of the selection performance command to the end of the exchange of the CD, if the user performs a volume variable operation and interrupts during this time, the volume control prohibition unit 12d
When it is determined that the volume control is currently prohibited by the volume control prohibition unit 12f (step 201), since the volume prohibition flag A is 1 and the volume control is prohibited, the interrupt processing is terminated without performing the volume control. .

For this reason, a user who mistakenly interprets the silent state for several minutes required for replacing a CD as
Even if you press 14c, the sound is output at the same volume as when you were listening to the tape before the CD started playing, so you won't be surprised by the unexpectedly high volume.

On the other hand, after the start of the performance of the CD, the prohibition of the volume control is released, so that the volume control desired by the user can be performed.

When the performance of the CD having the CD number "3" is completed, the CD changer control section 5 outputs a performance end signal to the control section 13 (steps 307 and 308 in FIG. 5). Upon input of the performance end signal, the mute control circuit 12c of the control unit 12 performs mute-on control on the mute circuit 10 to mute the sound output (steps 112 to 1 in FIG. 3).
15).

When the user presses, for example, the "4" key of the CD select key 14b after the end of the CD performance of the CD number "3" or during the performance, the control unit 12 determines that there is a CD selection operation (steps 112 and 113). ), Mute the sound output (step 116). Then, the process proceeds to a step 107, wherein a selected performance command including the CD number “4” is output, and the volume control is prohibited.

This prevents the volume from being erroneously increased during CD exchange.

When the selected change command is input after the end of playing the CD, the CD changer control unit 5 replaces the CD set in the CD playing unit 3 with "4" in the same manner as described above, and sends the selected performance command during the CD play. When the input is made, the CD playing section 3 performs the performance stop control and then exchanges the CD (steps 302, 309, 303 in FIG. 5). Then, after the performance start signal is output, the CD performance is started.

Upon input of the performance start signal, the control unit 12 releases the volume control prohibition in the same manner as described above, and receives a user's volume change operation to control the volume of the volume control unit 9.

When the CD mode key 14a is pressed in the CD playing mode,
The mode setting section 12a of the control section 12 sets the flag CDF to 0 to turn off the CD playing mode (steps 101 and 10 in FIG. 3).
2, 117), if the CD is being played, the command generator 12d outputs a performance stop command to the CD changer controller 5 (steps 118, 119). If the mute is currently on, the mute controller 12c is muted. After the mute is released by performing the off control (steps 120 and 121), the switch control unit 12b switches the audio switch 8 to the tape side (step 122).

As a result, the user can enjoy the original tape performance.

When the CD changer control unit 5 inputs a performance stop command during the CD performance, the CD changer control unit 5 controls the CD performance unit 3 to stop the performance by stopping the performance (steps 309 to 311 in FIG. 5).

In the above-described embodiment, the volume control is prohibited during the period from the issuance of the selected performance command to the input of the performance start signal. However, the volume control is prohibited when the CD is not played in the CD performance mode. (The volume control may be prohibited while the mute control unit 12c performs the mute-on control.)

Mute circuit when CD is not playing in CD playing mode
Although the sound output is muted at 10, when the CD playing section 3 of the CD changer 1 has a function of applying digital mute or analog mute when the CD is not playing, the mute circuit 10 and the mute control section 12 c <Effect of the Invention> According to the present invention, at least during the non-playing of the recording medium, at least until the performance of the recording medium is started after the selection performance command is issued, the volume control unit is controlled. A volume control prohibition unit for prohibiting the volume control by the control unit is configured so that the volume control is prohibited even if the volume variable operation is performed from the time the selection performance command is issued to the time the performance of the recording medium starts. During the replacement, even if the volume is increased carelessly, the performance starts at the volume that was previously listened to, so that you will not be surprised by unexpected loud sounds.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of an audio device according to the present invention, FIG. 2 is a block diagram showing a configuration of a control unit in FIG. 1, and FIGS. 3 and 4 show operations of the control unit in FIG. FIG. 5 is a flowchart for explaining the operation of the CD changer control unit in FIG. 1 CD changer 9 Volume control unit 12 Control unit 12d Volume control unit 12e Command generation unit 12f Volume control prohibition unit 14b CD select key 14c Volume up key 14d Volume down key

Claims (1)

(57) [Scope of request for utility model registration] 1. A recording medium selecting and playing section for storing a plurality of recording media in a magazine and selecting and playing a predetermined recording medium according to a selected playing command, and controlling a volume of an audio signal output from the recording medium selecting and playing section. An audio device having a volume control unit for adjusting the volume and a volume control unit for controlling the volume of the volume control unit in accordance with the volume change operation. An audio device, further comprising: a volume control prohibition unit that prohibits volume control by the volume control unit until the performance of the music starts.