KR950008790Y1 - Apparatus for reproducing digital voice data using a computer - Google Patents

Abstract

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Description

Digital voice data playback device by computer

1 is a circuit diagram of the present invention.

2 is a diagram illustrating voice data of the present invention.

3 is a flow chart of the present invention

* Explanation of symbols for main parts of the drawings

1: Program down counter 2: J / K flip flop

3: speaker 4: central processing unit

5: AND gate 6: latch circuit

The present invention relates to reproducing a digital voice signal using an existing computer. In particular, the digital voice data (DATA) can be reproduced in a pulse width modulation method using a timer (TIMER) function built in a program down counter. A device for reproducing digital audio data by a computer.

The IMB personal computer has three 16-bit timers, one of which adjusts the tone of the speaker by adjusting the pulse rate.

In other words, the three types of timers include a clock (RTC) function attached to the system itself, a function for giving a REREFHH function to RAM, or a timer for adjusting a ratio of pulses to drive a speaker.

In this case, the present invention uses only a timer that can be used when there is no clock function, that is, a speaker driving timer, so that the program down counter circuit counts twice for voice data and its reward data, and by this signal, J / K. It is an object of the present invention to provide a device capable of reproducing digital voice data by a computer by driving a flip-flop circuit to reproduce voice data in a pulse width modulation method and outputting the same through a speaker.

Hereinafter, described in detail by the accompanying drawings as follows.

As shown in FIG. 1, the program down counter 1 having a function of adjusting the tone rate of the speaker 3 by adjusting the pulse ratio is a J / K flip-flop in which the state is reversed according to the pulse output from the program down counter 1. In combination with the latch circuit 6 and the end gate 5 for applying an interrupt signal to the central processing unit 4, the end gate 5 is connected to the central processing unit 4 to generate an interrupt. The program down counter 1 can be preset by the output signal of the central processing unit 4, while the digital audio data by a computer connected to the output terminal of the J / K flip-flop 2 by the speaker 3 is connected. It is a playback device.

Referring to the operation and effects of the present invention made of the configuration as described above are as follows.

First, the central processing unit 4 generates data in which the preceding value complement is inserted between the audio data, and when the audio reproduction time comes from the central processing unit 4, the data is pre-stored in the program down counter 1 one by one. When set and the count value becomes "0", it receives an interrupt and processes the next data in this way.

In other words, the voice data is counted by the program down counter 1, and a pulse is output at the time when the counter is completed and simultaneously applied to one end of the J / K flip-flop 2 and the AND gate 5.

At this time, the output of the J / K flip-flop 2 is inverted to drive the speaker 3 while sending an interrupt signal to the central processing unit 4 in combination with the signal of the latch circuit 6 at the AND gate 5. This will repeat the same operation for the next data.

As a result, the output of the J / K flip-flop appears in the form of pulse width modulated voice data.

Therefore, the central processing unit 4 presets the program down counter 1 each time it receives an interrupt signal to change the contents of the counter, and simultaneously converts the audio data as a J / K flip-flop 2 output signal to pulse width modulation (PWM). It can be reproduced in the same way.

For example, the data stored in the program down counter 1 may have voice clock data of 140, 199, 100... As shown in FIG. … And the percentage is 200, the complement of clock data is 60, 1, 100, respectively. … Becomes

(a degree)

Therefore, when the voice output command of the central processing unit 4 is issued, when the clock data counted by the program down counter 1 is 140, the AND gate 5 frees the program down counter 1 by the AND gate 5. By setting it, the complement for the clock data 140, i.e., 60 is countered again and when the counting is completed, the program down counter 1 is preset.

Each time the reward of the clock data is counted by repetition of this state, the program down counter 1 outputs a pulse (b degree) and changes the J / K flip-flop 2 output by the signal.

That is, the J / K flip-flop 2 outputs a "high" signal for voice data and a "low" signal if the counted data is a complement (c degree). This is to be played.

The present invention, which operates as described above, utilizes a timer function built in the program down counter 1, but provides a digital voice data reproducing apparatus by a computer which reproduces the digital voice data in a pulse width modulation method. It is a useful design that can reproduce a more stable voice.

Claims (1)

In a conventional system in which the program down counter 1 is connected to the central processing unit 3 of an existing computer, the output terminal of the program down counter 1 is applied to the clock CK terminal of the J / K flip-flop 2. And the latch circuit 6 is connected to the other end of the AND gate 5 while the output signal thereof is transmitted to the central processing unit 4 while the central processing unit 4 is connected. And a speaker (3) connected to the output terminal (Q) of the J / K flip-flop (2).