KR100499222B1 - Generation apparatus for ring-back tone of telephone - Google Patents

Abstract

The present invention relates to a technique for generating a soft three-note double batting sound by synthesizing a sound tone and a harmonic sound in a specific format when a ring tone is generated in a telephone such as a video phone or an interphone. The present invention includes a control unit 41 for reading out a digital signal for sound generation from the memory 42, separating the synthesized sound into a sound and a harmonic, and outputting it; A D / A converter 43 for converting the digital signal into an analog signal and outputting the digital signal to an output terminal OUT; The low control signal output unit 44 and the high control signal output unit 45 outputting the low control signal L_CTL, the high control signal H_CTL for controlling the amplifier under the control of the controller 41 are achieved. .

Description

Phone ringer {GENERATION APPARATUS FOR RING-BACK TONE OF TELEPHONE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a technique for generating a ring tone in a telephone such as a videophone or an interphone. More particularly, the present invention relates to a ring tone generating apparatus for a telephone, which is capable of generating a soft three-tone double-twist sound by synthesizing a sound and a harmonic in a specific format. .

In general, most video phones and interphones are used as two-note double batters. 1 is a circuit diagram of an apparatus for generating a ring tone of a telephone according to the prior art, which will be described with reference to FIG. 2 as follows.

When the 'high' signal is input to the key port KEY of the melody integrated device 11, the output ports A1, A2 and B1, B2 have a predetermined frequency (for example, A: 440 Hz, B: 352 Hz). The signal is output, and the output time, interval and frequency of the signal are determined by the value of the resistor Rx.

In the state where the oscillation signal corresponding to the value of the resistor Rx is output to the output port A1, the output port A2, the resistor and the diodes R1, D2 are connected to the capacitor C1 side. When the high 'voltage is output, the square wave shown in FIG. 2 is output to the output terminal OUT. Subsequently, when the 'high' voltage output to the output port A2 is blocked, the signal output to the output terminal OUT becomes small as shown in FIGS. 3A and 3B.

As a result, in the state in which a predetermined oscillation signal is output to the output port A1 as described above, the envelope is generated by adjusting the charge / discharge time of the capacitor C1 through the output port A2. .

The principle of generating an envelope through the output ports B1 and B2 for the frequency B: 352 Hz is also the same as the principle of generating an envelope through the output ports A1 and A2 for the frequency B 440 Hz. .

In the conventional ring tone generating technology of the conventional telephone, a basic oscillation sound is generated by using a melody integrated device and two envelopes of two frequencies, and an envelope is generated by adjusting a charge and discharge time of a capacitor. Because it is the basic sound, the sound quality is not smooth and there is a defect of having the same tone regardless of the manufacturer.

Accordingly, it is an object of the present invention to provide a ring tone generating apparatus for a telephone that generates a soft three tone double batter sound by separating and synthesizing a memorized digital signal into a sound tone and a harmonic.

FIG. 4 is a block diagram showing an embodiment of an apparatus for generating a ring tone of a telephone according to the present invention. As shown therein, a digital signal for generating a sound stored in a memory 42 is read, and a Fourier transform is performed. A control unit 41 for synthesizing and outputting the harmonics; A D / A converter 43 for converting the synthesized digital signal into the analog signal and outputting it to an output terminal OUT; The low control signal output unit 44 and the high control signal output unit 45 for outputting a low control signal (L_CTL), a high control signal (H_CTL) for controlling the amplifier under the control of the control unit 41, Referring to Figure 5 attached to the operation of the present invention configured as described above in detail as follows.

In the memory 42, a digital signal for sound generation is stored. The controller 41 reads out the signals, performs Fourier transform, and separates and synthesizes the sound into a fundamental sound and a harmonic sound to perform a D / A converter. Output to side (43). The D / A converter 43 converts the digital signal, which is processed and input as described above, into an analog signal and outputs the melody signal of the original sound type as shown in FIGS. 5A and 5B.

The controller 41 generates envelope values by properly combining the sound and harmonics when generating the first, second, and third signals, so that a soft three-tone double-hit sound is output. To this end, when setting the frequency of the melody signal, the last frequency (e.g., C: 528Hz) of the three notes is set so that the first frequency (e.g., A: 792Hz) is "the last frequency. 3/2 "and the second frequency (e.g. B: 660Hz) is the" last frequency 5/4 ".

On the other hand, the control unit 41 controls the transistors Q1 and Q2 for the amplifier control, so that the low control signal L_CTL and the high control signal H_CTL for controlling the amplification degree of the three sound double batter sound signal. By selectively supplying, it is not necessary to implement a timer circuit or an amplifier control circuit separately.

As described in detail above, the present invention has the effect of separating and synthesizing the memorized digital signal into a sound tone and a harmonic to generate a soft three-tone double-hit sound, and thus can generate a distinctive call tone distinctly from a normal call tone. There is an effect that can give convenience in use.

1 is a circuit diagram of a ring tone generating device of a conventional telephone.

FIG. 2 is an exemplary view of a square wave output from FIG. 1. FIG.

3A and 3B are diagrams illustrating another square wave output from FIG. 1.

Figure 4 is a block diagram of a ring tone generating device of the telephone according to the present invention.

5A and 5B are waveform diagrams of melody signals output from FIG. 4.

*** Description of the symbols for the main parts of the drawings ***

41: control unit 42: memory

43: D / A converter 44: row control signal output unit

45: high control signal output unit

Claims (2)

When reading the digital signal for sound generation from the memory 42 and setting the frequency of the melody signal, after setting the last frequency of the three notes, the first frequency is " last frequency. &Quot; 3/2 ", the second frequency is" last frequency A control unit 41 for synthesizing the sound into a sound and a harmonic by synthesizing 5/4 "and outputting a three sound double batting sound; and a digital three sound double sounding signal output from the control part 41 as an analog signal. A D / A converter 43 for converting and outputting the output signal to the output terminal OUT, a low control signal L_CTL and a high control for controlling the amplification degree of the 3 sound double batter sound signal under the control of the controller 41; And a low control signal output section (44) for outputting a signal (H_CTL) and a high control signal output section (45). delete