JPS59169213A - Sound volume varying device - Google Patents

Abstract

PURPOSE:To exclude a volume for sound volume and to obtain a compact and highly reliable sound volume varying device by digitizing the sound volume varying information and storing the digital information to a nonvolatile memory after controlling the information with a sound volume key. CONSTITUTION:A sound volume key 111 is provided on a keyboard 112 for volume control of an alarm sound or an input confirmation sound. The output of the key 111 is applied to a sound volume key control circuit 109 in the form of an ON/OFF signal 110 and converted into a digital sound volume writing signal 108 to be applied to a nonvolatile sound volume memory 107. The signal read out of the memory 107 is applied to a sound volume varying circuit 103 in the form of a digital sound volume reading signal 106 to control the amplitude of a sound signal 102 which is an output of a sound generating circuit 101 and to sound a speaker 105 as an output 104. In such a way, a volume for sound volume can be excluded to obtain a compact and highly reliable sound volume varying device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a volume variable device, and more particularly to a circuit that generates an alarm sound, an input confirmation sound, etc. for a terminal device used in information processing.

Conventional volume control devices of this type use volume as a means of varying the volume of the generated sound, and therefore require installation space and dedicated wiring for the volume.
It had drawbacks such as low volume reliability and easy breakage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a volume variable device which eliminates the above-mentioned drawbacks and is inexpensive and reliable.

The present invention provides a sound generation circuit, a volume variable circuit that can vary the amplitude of a sound signal output from the sound generation circuit using a digital volume readout signal, a speaker for generating sound by the output of the volume variable circuit, and a volume control circuit that can vary the amplitude of a sound signal output from the sound generation circuit. One 0NOFF key to change the volume and ON/OFF of the volume key.
A volume variable device comprising: a volume key control circuit that converts an F signal into a digital volume write signal; and a nonvolatile volume memory that stores the digital volume write signal and outputs it as a digital foreground read signal. It is in.

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram illustrating a volume variable device according to an embodiment of the present invention. In FIG. 1, the volume variable device according to the embodiment of the present invention has a volume key 111 on a keyboard 112 for varying the volume of an alarm sound or an input confirmation sound, and the output of this volume key 111 is ON/OFF. It is applied as a signal 110 to the volume key control circuit 109, converted to a digital volume signal (write) 108, and applied to the nonvolatile volume memory 107. The signal read out from this non-volatile volume memo 1, 1107 is applied to the volume variable circuit 103 as a digital volume signal (readout) 106, and the sound signal 102 which is the output of the sound generation circuit 101
The amplitude of the signal is controlled, and the speaker 105 is sounded as the output 104. The volume key 111 may simply be a 0NOFF key, and the output ON OFF signal is a signal that remains at a high level only while the volume key 111 is being pressed, for example. The volume key control circuit 109 is ON
The FF signal 110 is converted into a 4-bit parallel digital volume signal (written) 108, for example. The state of this digital volume signal (written) 108 is stored in the non-volatile volume memo 17107, and the set state will remain the same the next time you use it after turning off the power! Yes, it is preserved. As the non-volatile volume memo 17107, a battery-backed complementary metal oxide semiconductor (0MO8) memory or the like can be used. The contents of the nonvolatile volume memory 107 are constantly read out and given to the volume variable circuit 103 as a digital volume signal (readout) 106. The sound generation circuit 101 is composed of a multi-vibrator or the like, and generates a sound signal 102. The sound number 102 passes through a volume variable circuit 103 and is output as an output 104.
However, at this time, the digital volume signal (readout) 1o6
The amplitude is adjusted by controlling .

Next, in FIG. 2, the circuit of the volume variable circuit i03 of FIG. 1 is shown. Referring to FIG. 2, the circuit includes a sound signal 10
2 is applied to the buffer 210 through the first resistor 201 and generates the output 104. The input of the buffer 210 includes the second . Third. 4th. Fifth resistor 2
02, 203°, 204, 205 are connected and pl 1st, 2nd, respectively. Third. Fourth transistor 206,2
It is grounded by 07°208.209. Also, the first transistor 206 to the fourth transistor 20
A digital volume signal (readout) 106 is connected to the base of 9 to a 4-bit parallel input terminal. here,
Depending on the combination of voltage levels of each terminal of the digital volume signal (readout) 106, the first to fourth transistors 206 to 4
The combination of ON and OFF of the transistor 209 is determined, and the combination of the first resistor 201 and the second resistor 202 to the fifth resistor 209 is determined.
The amplitude of the sound signal 102 is determined by a resistor network made up of resistors 205 .

Next, according to FIG. 3, the volume key control circuit 109 of FIG.
Explain the circuit. Referring to FIG. 3, in this circuit, the clock output 302 of the variable volume clock oscillation circuit 301 and the 0NOFF signal 110 are input to an AND gate 305, which generates a counter clock 303 as an output, and the clock input of a 4-bit counter 304. It is given as Outputs 1 to 4 of the 4-cut counter 304 become a digital volume signal (written) 108. Here, the volume variable clock oscillation circuit 301 oscillates at a frequency of about 3 to 10 Hz, and only while the ON OFF signal 110 is at a high level, the 4-bit counter 304 is operated to count, and the digital volume signal (write) is generated. 108 and changes the volume.

According to the present invention, as explained above, the volume variable information is digitalized, the volume variable information is controlled from the volume key, and is stored in a non-volatile memory, so that the volume for volume can be deleted, and a compact and highly reliable This provides the advantage that the device can be configured.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a volume variable device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a volume variable circuit shown in FIG. 1, and FIG. 3 is a circuit diagram showing a volume key control circuit shown in FIG. FIG. In the figure, 101... sound generation circuit;
1o2...Par° sound signal, 103...Volume variable circuit, 104...Output, 105°゛°°°・Speaker, 106...Digital volume signal (readout) ), 107...Non-volatile volume memory, 108.
...Digital volume signal (writing), 109...
...Volume key control circuit, 110...0NOF
F signal, 111...Volume key, 112...
...Keyboard, 201...Ro, 201 to 205...Resistor, 206 to 209...
...Transistor, 210...Buffer, 30
1...Volume variable clock oscillation circuit, 302°°
°・Backclock output, 303...Counter clock, 304...4-bit counter, 305...
・. ...and gate. Figure 2 and Figure 3

Claims (1)

[Claims] A sound generation circuit that generates a sound signal, a volume variable circuit that can vary the amplitude of the sound signal output from the sound generation circuit using a digital volume readout signal, a speaker that generates sound by the output of the volume variable circuit, and a volume control circuit. a volume key control circuit that converts the 0NOFF signal from the key into a digital volume write signal, and a nonvolatile volume that stores the digital volume write signal and outputs it as the digital volume read signal. A volume variable device characterized by being equipped with a memory.