JPH02128508A - Audio amplifier - Google Patents

Abstract

PURPOSE:To obtain at the time of turning on the power source of an audio amplifier a piece of information of an input device and a sound volume different from those at the time of turning off the power so as to use the amplifier as an alarm clock by providing the audio amplifier with a second selection switch and a second sound volume switch which output designated information of the set input device and level information of the audio output only at the time when the power is turned on. CONSTITUTION:When a first select switch 13 and a first sound volume switch 15 are operated, the output of a designated input device 2 is obtained in a designated level. A mode switch 17 is set to the second mode, and a second select switch 14 and a second sound volume switch 16 are operated to set another input device 2 and level. Then, selected connection information and level information set to the second select switch 14 are inputted to a connecting circuit 10 and a sound volume circuit 11 when the power source of the audio amplifier is turned on. Thus, the output of the held and designated input device 2 is obtained in the designated level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio amplifier, and particularly to an audio amplifier that selects a plurality of input devices and obtains an output.

[Conventional technology]

Conventionally, this type of audio amplifier has a selection switch that selects multiple input devices such as a tuner and a chipboard;
A connection circuit that holds the connection information output from the selection switch and connects the input device, a volume switch, a volume circuit that holds the level information output from the volume switch and adjusts the volume, and an amplifier. The input selected by the selection switch and the volume selected by the volume switch are always maintained, and these states do not change even if the power is turned on or off.

[Invention or problem to be solved]

In the conventional audio amplifier described above, it is not possible to specify that the input device connected by the selection switch and the volume set by the volume switch be changed from the respective settings when the power is turned on. Therefore, when using a timer to perform a disconnect->turn-on operation, if you set the desired input device and volume before disconnecting, you will not be able to obtain a different input device and volume when turning on instead of an alarm. There are drawbacks.

[Means to solve the problem]

The audio amplifier of the present invention includes a connection circuit that holds connection information for connecting one of a plurality of input devices sent out from a selection switch and connects the input device specified by this information, and a level output from a volume switch. In an audio amplifier that has a volume circuit that holds information and adjusts the volume to the volume specified by this information, there is a mode switch that specifies a specific operation mode, and a mode switch that specifies a specific operation mode when the power is turned on. a second selection switch that sends connection information for connecting one of the plurality of input devices set when the input device is connected to the connection circuit; and the mode switch specifies a specific operation mode and the power is turned on. and a second volume switch that outputs the set level information to the volume circuit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which an audio amplifier 1, a plurality of input devices 2, a speaker 3, and a timer switch 4 for turning on and off the power of the audio amplifier 1 are shown.

The audio amplifier 1 includes a connection circuit 10 that holds selected connection information and selectively connects the input device 2, and a volume circuit that holds level information and adjusts the output level from the connection circuit 10 to a specified level and outputs it. 11, an amplifying section 12 that amplifies the output of the volume circuit 11 and supplies it to the speaker 3, a first selection switch 13 that outputs this information every time selection connection information is set, and a selection connection that is set only when the power is turned on. A second selection switch 14 that outputs information, a first volume switch 15 that outputs level information every time this information is set, a second volume switch 16 that outputs level information that has been set only when the power is turned on, and a second selection switch 14 that outputs level information each time it is set. A mode switch 17 for switching between the first mode and the second mode, and a mode switch 1
7 is in the first mode, the information from the first selection switch 13 is always transmitted to the connection circuit 10, and when the mode switch 17 is in the second mode, the information from the second selection switch 14 is transmitted only when the power is turned on. When the mode switch 17 is in the first mode, the information from the first volume switch 15 is always transmitted to the volume circuit 11, and the mode switch 17 is in the second mode. , the switching section 19 transmits information from the second volume switch 16 to the volume circuit 11 only when the power is turned on.

In the above configuration, the first selection switch 13 and the first
By operating the volume switch 15, the output of the designated input device 2 can be obtained at the designated level. Next, the mode switch 17 is set to the second mode, and the second selection switch 14 and second volume switch 16 are operated to set another input device 2 and the level. When the power is turned on to the audio amplifier, the selection connection information and level information set in the second selection switch 14 are input to the connection circuit 10 and the volume circuit 11, and are held and output from the specified input device 2. Obtained at the specified level. After this, regardless of the designation of the mode switch 17, the first selection switch 13 and the first
The input device 2 and level can be set using the volume switch 15.

〔Effect of the invention〕

As explained above, the present invention provides a conventional audio amplifier with a second selection switch and a second volume switch that output input device designation information and audio output level information set only when the power is turned on. By supplying these information to the input device's connection circuit and volume circuit, for example, you can specify the timer switch to turn off and on, and if you listen to the radio at a low volume when you go to bed, and then turn on the tape in the morning. This has the effect of being able to be output at a high volume for visual purposes, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1... Audio amplifier, 2... Input device, 3... Speaker, 4... Timer switch, 10... Connection circuit,
11...Volume circuit, ]2... Amplifying section, 13... First selection switch, ]4 ・2nd i! ! Selection switch, 15
...First volume switch, 16...Second volume switch,
17...Mote switch, 18.19...Switching section.

Claims (1)

[Claims] A connection circuit that holds connection information for connecting one of the plurality of input devices sent out from the selection switch and connects the input device specified by this information, and a connection circuit that holds the level information output from the volume switch and stores this information. In an audio amplifier that has a volume circuit that adjusts the volume to a volume specified by a mode switch that specifies a specific operation mode, and a mode switch that specifies a specific operation mode and a plurality of settings that are set when the power is turned on. a second selection switch that sends connection information for connecting one of the input devices to the connection circuit; and a second selection switch that sends connection information for connecting one of the input devices to the connection circuit; and a second volume switch that outputs to the volume circuit.