KR920004816Y1 - Voice Mode Switching Circuit Using Pulse Width Modulation - Google Patents

Abstract

No content.

Description

Voice Mode Switching Circuit Using Pulse Width Modulation

1 is a circuit diagram of a conventional design.

2 is a circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Pulse Oscillator 2: Mode Switching Decoder

3: PWM signal generating unit 5: inverting unit

10: rectifier IC1: micom

IC2: Voice Multiple IC R1-R6: Resistance

C1, C2: capacitor Q1: transistor

D1: diode

The present invention provides a voice mode switching circuit using a pulse width modulation to convert a voice multiple mode into a pulse width modulation (PWM) pulse having a different duty ratio according to the voice multiple mode selection signal. It's about.

Conventionally, as shown in FIG. 1, the transistors Q1-Q4 are selected to be driven by the outputs of the output terminals P1-P3 of the microcomputer IC1, and the resistors connected to the collector side of the transistors Q1-Q4 ( The power B ⁺ distributed to R8) (R4) (R3) is applied to the voice multiplexer IC2 to switch the voice multiplexer mode.

That is, according to the prior art, the voice output mode P1-P3 is changed to the "low / high" level and output to the voice multiplex IC (IC2) by selecting the voice multiple mode (local language, foreign language, national language + foreign language, stereo). The voice multiple mode selection voltage is changed to switch the voice multiple mode.

Looking at this by selecting the voice multiple mode as follows.

First, when the national language mode is selected, the outputs of all the output terminals P1-P3 of the microcomputer IC1 are output at the "low" level, and the transistors Q2 are "turned off" each of the transistors Q1, Q3, and Q4. Only "turns on".

Therefore, since the power supply B ⁺ through the resistor R8 flows to the ground through the transistor Q2, the voltage applied to the voice multiplex IC IC2 becomes 0V.

In addition, when the stereo mode is selected, only the output of the output terminal P1 of the output terminals P1-P3 of the microcomputer IC1 is output at the "high" level and the output of the output terminals P2 and P3 is "low". By outputting at the level, only the transistor Q1 is "turned on" and the transistors Q3 and Q4 are "turned off" by the "high" level output of the output terminal P1 through the diode D1, while the transistor Q1 is turned on. Transistor " Turn off "

Therefore, all the voltages of 12 V, the power source B ⁺ applied to the resistor R8, are applied to the voice multiplexer IC2 as the voice multiple mode selection voltage.

When the national language + foreign language mode is selected, only the output of the output terminal P2 of the output terminals P1-P3 of the microcomputer IC1 is output at the "high" level, and the output of the output terminals P1, P3 is " The transistors Q1 and Q3 that are output at the low level and are applied to the "high" level output of the output terminal P2 through the diode D2 and the resistor R1 are " turned on " and the transistors Q2 and Q4. Enters the "turn off" state.

Therefore, a voltage of 4 V, which is the power source B ⁺ divided by the resistor R8 and the resistor R4, is applied to the voice multiplex IC IC2 as the voice multiple mode selection voltage to the voice multiplexer IC2.

Finally, when the foreign language mode is selected, only the output of the output terminal P3 of the output terminals P1-P3 of the microcomputer IC1 is output to the "high" level, and the output of the output terminals P1 and P2 is "low". The transistors Q1 and Q4 that are output at the "level" and have the "high" level output of the output terminal P3 applied through the diode D3 and the resistor R2 are "turned on" and the transistors Q2 and Q3 are turned on. It will be in the "turn off" state.

Therefore, a voltage of 8 V, which is the power supply B ⁺ divided by the resistor R8 and the resistor R3, is applied to the voice multiplex IC IC2 as the voice multiple mode selection voltage to the voice multiplexer IC2.

Such a microcomputer IC1 outputs a "low / high" level output from the output terminals P1-P3 to change the level of the voice multiple mode selection voltage input to the voice multiplex IC (IC2). The voice multiple mode is switched according to the voice multiple mode selection voltage input from

However, in this conventional design, the voice supplied to the voice multiplex IC (IC2) is controlled by changing the output level of the output terminals P1-P3 of the microcomputer IC1 for each voice multiple mode to control the driving of the transistors Q1-Q4. Although the multiple mode switching voltage was selected, this caused a problem in that the price of the circuit was increased due to a complicated circuit configuration.

Therefore, the purpose of this security is to output PWM pulses with different duty ratios by the voice mode selection signal according to voice multiple mode selection, and then reverse rectify them so that the voice multiple ICs are supplied with voice multiple mode selection voltage. A PWM pulse generator for generating PWM pulses having different duty ratios according to the multiple mode selection, and converting means for inverting and rectifying the PWM pulses generated in the PWM pulse generator to a DC value.

The present invention is described in detail by the accompanying drawings as follows.

FIG. 2 is a circuit diagram of the present invention, in which a voice multiplex mode selection circuit is configured with a voice multiplexer IC (IC2) for switching a voice multiplex mode to a voice multiple mode switching voltage input having different levels. The microcomputer IC1 outputs PWM pulses having different duty ratios, the inverter 5 for inverting the PWM pulse output of the microcomputer IC1 and the PWM pulses inverted by the inverter 5 to DC voltage. After the conversion is composed of a rectifier 10 for applying to the voice multiple mode switching voltage of the voice multiplex IC (IC2).

Here, the inverting unit 5 and the rectifying unit 10 apply a PWM pulse of the PWM signal generating unit 3 to the base side of the transistor Q1 through the capacitor C1 of the resistors R2 and R3 and at the same time, the resistor ( R1) for applying a power supply (B ⁺⁾ through and collector side the output of the resistor (R4) power supply (B ⁺⁾ transistor (Q1) which is applied through the sikimyeo is a resistance (R5) of the parallel-connected diode (D1) the The output of the diode D1 and the resistor R5 is configured to be integrated through the capacitor C2 and the resistor R6 and then applied to the voice multiplexer IC2 as the voice multiple mode switching voltage.

Hereinafter will be described the effect of the present invention. First, the pulse oscillator 1 configured in the microcomputer IC1 generates a pulse of a constant frequency and applies it to the mode switching decoder 2.

At this time, if the voice multiple mode selection signal is inputted to the microcomputer according to the voice multiple mode (local language, foreign language, national language + foreign language, stereo) selection, the mode switching decoder 2 configured in the microcomputer IC1 recognizes this and then the pulse oscillator The control signal for controlling so as to generate a pulse of a constant frequency oscillated in (1) and a PWM pulse having a different duty ratio in the PWM signal generator 3 is outputted.

That is, the pulse of the constant frequency oscillated by the pulse oscillator 1 is continuously applied to the PWM signal generator 3 with the mode switching decoder 2 while the PWM signal generator according to the voice multiple mode selection signal. The control signal to be output to (3) is a mode switching decoder (2) that recognizes the voice multiple mode selection signal input according to the voice multiple mode selection by selecting a control signal according to the selected voice multiple mode PWM signal generator (3) Will be printed as

In this way, the oscillating pulse is input to the pulse oscillator 1 through the mode switching decoder 2, and the control signal of the mode switching decoder 2 which recognizes the voice multiple mode selection signal according to the voice multiple mode selection is input and the PWM signal. Although not shown in the drawing, the generator 3 includes a ROM capable of storing a program, and has a duty ratio different from the pulse oscillated by the pulse oscillator 1 according to a control signal input from the mode switching decoder 2. It converts into PWM pulses.

As the voice multiplex mode of the national language, foreign language, national language + foreign language, and stereo is selected, if the voice multiplex mode selection signal is the national language selection mode, the local language selection signal selected by the mode switching decoder (2) recognizes the PWM signal. The control unit 3 outputs a control signal.

The PWM signal generator 3 selects a program according to the native language mode selection among programs stored in a ROM configured in the PWM signal generator 3 by recognizing the control signal according to the selected native language mode as described above. ) Generates a PWM pulse for national language mode switching.

That is, the PWM signal generation unit 3 that recognizes the voice multiple mode selection signal according to the native language mode selection through the mode switching decoder 2 selects a program according to the native language mode switching among the programs stored in the ROM, The pulse of the oscillated constant frequency is converted into a PWM pulse having a 100% duty ratio and outputted without converting the frequency.

In addition, when the voice multiple mode selection signal is a foreign language mode, it recognizes the national language selection signal selected by the mode switching decoder 2 and outputs a control signal to the PWM signal generator 3.

The PWM signal generator 3 recognizes the input control signal according to the foreign language mode selection by the PWM signal generator 3 and selects the program according to the foreign language mode selection among the programs stored in the ROM configured in the PWM signal generator 3. ) Generates a PWM pulse for foreign language mode switching.

That is, the PWM signal generator 3 which recognizes the voice multiple mode selection signal according to the foreign language mode selection through the mode switching decoder 2 selects a program according to the foreign language mode switching among programs stored in the ROM, The pulse of the oscillated constant frequency is converted into a PWM pulse having a duty ratio of 33% without outputting a frequency.

When the voice multiple mode selection signal is a native language + a foreign language mode, the control unit outputs a control signal to the PWM signal generator 3 by recognizing the native language + foreign language selection signal selected by the mode switching decoder 2.

The PWM signal is recognized by the PWM signal generator 3 by recognizing the input control signal according to the selected national language + foreign language mode and selecting the program according to the national language + foreign language mode selection among the programs stored in the ROM configured in the PWM signal generator 3. The generator 3 generates a PWM pulse for switching between the native language and the foreign language mode.

That is, the PWM signal generation unit 3 that recognizes the voice multiple mode selection signal according to the national language + foreign language mode selection through the mode switching decoder 2 selects the program according to the national language + foreign language mode switching among the programs stored in the ROM and generates the pulse oscillation unit. The pulses of the constant frequency oscillated in (1) are converted into PWM pulses having 67% duty ratio by converting only the duty ratio to 67% without changing the frequency in the same language as described above in the native language and foreign language mode.

Finally, when the voice multiple mode selection signal is a stereo mode, the control signal is output to the PWM signal generator 3 by recognizing the stereo selection signal selected by the mode switching decoder 2.

The PWM signal generator 3 selects a program according to the stereo mode selection among the programs stored in the ROM configured in the PWM signal generator 3 and recognized by the control signal PWM signal generator 3 according to the input stereo mode. Will generate a PWM pulse for stereo mode switching.

That is, the PWM signal generation unit 3 that recognizes the voice multiple mode selection signal according to the stereo mode selection through the mode switching decoder 2 selects a program according to the stereo mode switching among the programs stored in the ROM, Instead of the frequency-converted pulse of the oscillated constant frequency, only the duty ratio is converted to 0%, unlike the native language, foreign language, and national language + foreign language mode described above, and is converted into a PWM pulse having a duty ratio of 0%.

Here, the duty ratio of the PWM pulses output at different duty ratios according to the control signal of the mode switching decoder 2 in the PWM signal generator 3 is a PWM pulse. Is the ratio of period (T) to high level (T1). Since the frequency of PWM pulse is constant, period (T) is output at a constant value at any time, but the ROM program is selected according to the voice multiple mode switching. By converting the (T1) value, the duty ratio (T1 / T) is converted.

In this way, the microcomputer IC1 generates PWM pulses having different duty ratios according to the voice multiple mode as the voice multiple mode selection signal input according to the voice multiple mode selection, and applies them to the inverting unit 5.

As such, the PWM pulses having different duty ratios output from the microcomputer IC1 are added to the power supply B ⁺ through the resistor R1 and then the transistors Q1 through the resistors R2 and R3 and the capacitor C1. Is applied to the base side to drive transistor Q1.

At this time, when the high level T1 of the PWM pulse is applied, the transistor Q1 is "turned on" so that the power supply B ⁺ through the resistor R4 flows to the ground through the transistor Q1, so that the transistor Q1 is turned on. If the collector-side output is output at the "low" level while the low level T2 of the PWM pulse is applied, it is "turned off" so that the power supply B ⁺ through the resistor R4 is grounded through the transistor Q1. Since it is blocked, the collector-side output of transistor Q1 is output at the "high" level.

That is, the PWM pulse output from the microcomputer IC1 is inverted through the transistor Q1 and is applied to the rectifier 10 as a PWM pulse having a duty ratio of 0% when selecting a native language mode, and a duty of 67% when selecting a foreign language mode. It is applied to the rectifier 10 with a PWM pulse having a ratio, while it is applied to the rectifier 10 with a PWM pulse having a duty ratio of 33% when a national language + a foreign language mode is selected, and finally a duty ratio of 100% when a stereo mode is selected. It is applied to the rectifier 10 as a PWM pulse having a.

The excitation resistor R3 and the capacitor C1 accurately drive the transistor Q1 to control the collector output of the transistor Q1 to be output as a PWM pulse in which the input PWM pulse is completely inverted.

As such, the PWM pulse output from the collector side of the transistor Q1 has a voice having a different level converted to a DC value through the rectifier 10 composed of the diode D1, the resistors R5, R6, and the capacitor C2. The multiple mode switching voltage is applied to the voice multiplex IC (IC2).

At this time, while charging is performed quickly through the PWM pulse diode D1 output from the inverting unit 5, the pulse pulse is converted into a DC value because the discharge is slow by the time constant of the resistor R5 and the capacitor C2.

That is, the PWM pulse inverted by the inverting unit 5 is rectified through the rectifying unit 10 and applied to the voice multiplexing IC (IC2) as a negative multiple mode switching voltage. The rectified value is applied with a voltage of 0V (the maximum value of the PWM pulse output from the inverting unit 5 is 12V and the minimum value is 0V), and the present invention is applied, and has a duty ratio of 67% when selecting a foreign language mode. 8V voltage is applied to rectify the PWM pulse, while 4V voltage is applied to rectify the PWM pulse having a duty ratio of 33% when selecting the national language + foreign language mode. The voltage of 12V rectifying the PWM pulse with

In this way, PWM pulses with different duty ratios are generated and inverted according to the voice multiple mode selection signal and applied to voice multiple mode switching voltages of different levels (0V, 8V, 4V, 12V) to the voice multiplex IC (IC2). In the voice multiplexing IC (IC2), the voice multiplexing mode is switched according to the voice multimode switching voltage level.

That is, the voice multiplex IC (IC2) recognizes different levels of voice multiple mode switching operation as in the conventional design and switches to the selected voice multiple mode.

As described above, the present invention generates a PWM pulse having a different duty ratio according to the voice multiple mode selection, converts it to a DC voltage by inverting it, and then applies the voice multiple mode switching voltage to the voice multiple IC to apply the voice multiple mode. Switching eliminates complex circuitry, reducing production costs while providing accurate voice multiple mode switching using PWM pulses.

Claims (2)

In a voice multiple mode selection circuit configured with a voice multiple IC (IC2) for switching a voice multiple mode to a voice multiple mode switching voltage input having different levels, a PWM pulse having a different duty ratio is generated according to the voice multiple mode selection signal. After converting the microcomputer IC1 to be output, the inverting unit 5 for inverting the PWM pulse output of the microcomputer IC1, and the PWM pulse inverted and outputted by the inverting unit 5 to a DC voltage, a voice multiplex IC ( A voice mode switching circuit using pulse width modulation comprising a rectifying section 10 configured to apply IC2) to a voice multiple mode switching voltage. 2. The inverter 5 and the rectifier 10 apply a PWM pulse of the PWM signal generator 3 to the base side of the transistor Q1 through the resistors R2 and R3 and the capacitor C1. Sikkim and simultaneously applying the power (B ⁺⁾ through a resistor (R1) and through a resistor (R4) power supply (B ⁺⁾ the collector of the transistor (Q1) which is applied to the side output of a parallel connected diode (D1) and a resistor (R5 Pulse width configured to be applied as a negative multiple mode switching voltage to the voice multiplexer IC (IC2) after integrating the output of the resistor R5 of the diode D1 through the capacitor C2 and the resistor R6. Voice mode switching circuit using modulation.