KR970003037B1 - Apparatus ane method for real-time dubbing in camcorder shooting - Google Patents

Abstract

A apparatus for a camcoder which can simultaneously dub background sound while the recording operation of the camcoder is operated is disclosed. The apparatus includes a key input part(26) for selecting a background sound and an inserting type of that; a microcomputer(19) for performing an inserting control of the background sound according to the inserting type selected by the key input part; a memory part(21) for memorizing the background sound and outputting data of background sound under the control of the microcomputer; a parallel/serial converting part(22) for converting the data of background sound into serial data; a data buffer part(22) for temporarily memorizing the serial data; a D/A converting part(24 and 25) for converting the data of background sound into an analogue signal; and a mixing part(17 and 18) for mixing the analogue signal with a signal from a microphone.

Description

Dubbing Device and Method for Simultaneous Background Sound Effects on Camcorder

1 is a block diagram showing an audio recording circuit configuration of a conventional camcorder.

Figure 2 is a circuit diagram showing a background music dubbing device when shooting the camcorder of the present invention.

3 is a flowchart showing a method of dubbing a background effect sound when a camcorder of the present invention is photographed.

* Explanation of symbols for main parts of the drawings

17, 18: mixer 19: microcomputer

21: memory 22: parallel / serial converter

23: data buffer section 24, 25: D / A converter section

26: key input unit

The present invention relates to an apparatus and a method for simultaneously dubbing a background effect sound of a camcorder suitable for enhancing sound effects by performing dubbing at the same time by separately inserting music into a microphone signal when shooting a camcorder.

As shown in FIG. 1, a conventional camcorder includes an amplifier (3) (4) for amplifying audio signals input through the left (L) and right (R) microphones (1) and (2), respectively, and amplification. The matrix unit 5 adds / subtracts the left and right audio signals and outputs them, and the signal processing unit 6 processes the added / subtracted output audio signals. Reference numerals C1 to C4 denote capacitors.

In the case of recording using the microphone recording circuit of the conventional camcorder configured as described above, as shown in FIG. 1, the audio signal input through the left and right microphones 1 and 2 is input to the amplifying unit 3 and 4, After each amplification is applied to the matrix portion (5).

The audio signal input to the matrix unit 5 is added / subtracted for each channel (R / L) and processed by the signal processing unit 6, and then outputs a recording radio frequency (R / F) signal to the tape through the head. To record. However, since the conventional camcorder records only the audio signal input through the left and right microphones 1 and 2 on the tape, if the user wants to obtain a sound effect, the user must dub a separate background music (sound) using an editor. There was a problem with discomfort.

In order to solve the conventional problems, the present invention stores various contents of music, sound, and voice in a memory, and inserts music, sound, and voice signals stored in the memory when necessary during camcorder shooting, thereby enabling simultaneous recording and dubbing. The constitution and operation of the present invention will be described with reference to the accompanying drawings for the purpose of adding convenience to and improving the sound effect.

First, as shown in FIG. 2, the background music dubbing apparatus of the camcorder of the present invention includes an amplifier for amplifying a voice signal input through the left (L) and right (R) microphones 11 and 12, respectively. 13) 14, a mixer unit 17 and 18 for mixing the amplified output audio signal and the memorized effect sound signal under the control of the microcomputer 19, and a matrix unit for adding / subtracting the mixed audio signal. (15), a signal processor (16) for processing the audio signal added / subtracted from the matrix unit (15), a microcomputer (19) for selecting and inserting a background effect sound, and the microcomputer (19) of the microcomputer (19). OSD unit 20 for displaying a list of effect sound signals to be selected under control, a memory unit 21 for storing various effect sound signals and outputting a specific sound effect signal under the control of the microcomputer 19, and the memory unit 21 A parallel / serial conversion section 22 for converting the sound effect data output from the serial data into serial data; The buffer unit 23 for buffering and amplifying the serial data and the effect sound signal output from the buffer unit 23 are converted into analog signals, respectively, so as to be mixed with the voice signals input through the microphones 11 and 12. A key for supplying a selection signal to the microcomputer 19 to select a desired song among the D / A converters 24 and 25 applied to the mixers 17 and 18 and the effect sound signals stored in the memory 21. The key input unit 26 is composed of an input unit 26, and the key input unit 26 fades the selection switch SW1 (SW2) for selection, the insertion switch SW3 for inserting the selected voice signal, and the inserted BGM signal. ), A fade switch (SW4) for processing, and a recording switch (SW5) for requesting the start of the record (REC) of the selected effect sound signal. Reference numerals C5 to C10 are capacitors, R1 to R6 are resistors, and Xr is a crystal.

As shown in FIG. 2 and FIG. 3, the effect of the present invention configured as described above is a selection switch SW1 in order to improve the sound effect of the voice signal input through the left and right microphones 11 and 12 during camcorder shooting. When (SW2) is turned on, the microcomputer 19 displays a list of desired songs among various sound effect (music, sound, voice) signals stored in the memory unit 21 through the OSD unit 20, and the photographer views the list. Select. Thereafter, when the on / off state of the recording switch SW5 for recording the selected song is judged to be on, the on / off state of the insertion switch SW3 is determined to determine the insertion level of the selected song signal. That is, the on / off state of the fade switch SW4 for fading the selected audio signal FADE (gradual level increase) is determined.

If the fade switch SW4 is turned on, the gain is determined through the output terminals A and B of the microcomputer 19 and inserted into the mixer unit 17 (l8) with the volume gradually increasing from the volume of the very low signal. When the fade switch SW4 is turned off, the fade switch SW4 is inserted into the mixer unit 17 and 18 at a predetermined level through the output terminals A and B of the microcomputer 19.

That is, when the insertion switch SW3 is turned on, the microcomputer 19 selects a desired music from among various music, sound, and voice signals stored in the memory 21, and the serial data is output through the parallel / serial conversion unit 22. Is converted to and amplified by the buffer unit 23.

Each amplified serial data is converted into an analog signal by the D / A converters 24 and 25 and input to the left and right microphones 11 and 12 through the mixer units 17 and 18. (Signal amplified by amplifiers 13 and 14). At this time, the audio signal mixed with the dubbing process as described above by the mixer unit 17 and 18 is added / subtracted through the matrix unit 15 and then recorded and processed by the signal processor 16. The signal is recorded in the tape through the head, and then reproduced by the signal processor 16 when necessary to output a sound signal with improved sound effect through the left and right speakers.

As described above, various music, sound, and voice signals are stored in the memory of the camcorder, and when necessary during the camcorder shooting, various audio signals stored in the memory are reproduced and inserted, thereby maximizing the sound effect.

Claims (5)

A key input unit 26 for selecting a background effect sound and an inserting form, a microcomputer 19 for controlling the insertion of the background effect sound in accordance with the music and an insertion form selected from the key input unit 26, and a background effect sound are stored. And a memory unit 21 for outputting background effect sound data under the control of the microcomputer 19, a parallel / serial conversion unit 22 for converting the output background effect sound data into serial data, and the serial background effect sound data. A data converter 23 for temporarily storing the data, a D / A converter 24 and 25 for converting the background effect sound data output from the data buffer unit 23 into an analog background effect signal, and the analog background effect sound. Simultaneous dubbing device for recording a background effect sound when the camcorder is composed of a mixer unit (17) (18) which mixes a signal with an audio signal input from a microphone and simultaneously dubs it. The apparatus of claim 1, further comprising a OSD unit (20) for displaying a list of the background effect sounds stored in the memory unit (21) on the screen under the control of the microcomputer (19). . The key input unit 26 is a selection switch SW1 (SW2) for selecting the background effect sound, an insertion switch (SW3) for instructing the insertion of the background effect sound, and a fade (background effect sound). A fade switch (SW4) for selecting a fade) and a recording switch (SW5) for selecting whether or not to simultaneously record a background effect sound. A first process of selecting a sound to be inserted while displaying a list of background effect sounds according to the selection of a photographer's height, a second process of selecting an insertion type of the background effect sound selected in the first process, and the first process The background during the shooting of the camcorder comprising a third process of outputting the background effect sound selected in the step and mixing the audio signal input from the microphone and controlling the insertion background effect sound level according to the insertion type of the background effect sound selected in the second process. Simultaneous dubbing of sound effects. The method of claim 4, wherein the insertion pattern in the second process is divided into a fade insertion in which a background effect sound gradually increases with time and reaches a predetermined level, and a form in which mixing is performed at a predetermined level from the insertion step. And, in the third process, controlling the background gain sound level by controlling the mixed gain of the background effect sound with the gain corresponding to this insertion type.