JP2005236644A - Recording/reproducing device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a sound zoom function by one kind of microphone and zoom to left and right pictures. <P>SOLUTION: There are provided a signal processor 9 for recording for separately performing signal processing to sound in the front and sound providing spatial impression in the left and right directions by one kind of omnidirectional microphone, and a signal processor 12 for reproduction for independently generating right and left sounds when the sound is zoomed in reproduction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing apparatus and a recording / reproducing method, and relates to audio signal processing.

Some conventional recording apparatuses have been subjected to audio zoom during reproduction (see, for example, Patent Document 1). Hereinafter, conventional audio zoom during reproduction will be described. Conventionally, a recording apparatus uses two types of directional microphones and undirected microphones, records two types of audio, and outputs the audio while changing the mixing ratio during reproduction so as to synchronize with the video signal.
JP 2001-268504 A

  However, in the above conventional example, two types of microphones must be mounted. Also, there is only a zoom function for the front, and zooming for the left and right images is impossible.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a recording / reproducing apparatus and a recording / reproducing method capable of performing an audio zoom function with one type of microphone and zooming with respect to left and right images.

  In order to achieve the above object, a recording / reproducing apparatus of the present invention includes a plurality of microphones, an audio signal processing unit that generates three or more types of audio signals from a plurality of audio signals from the plurality of microphones, and the three types. It comprises a means for separately recording the above audio signals and a reproduction audio signal processing means for reading out the three or more types of recording signals during reproduction and generating two or more types of signals.

  The recording / reproducing apparatus of the present invention includes a plurality of microphones, an audio signal processing means for generating three or more types of audio signals from two or more types of audio signals from the plurality of microphones, and a video input for inputting a video signal. Means, recording means for separately recording the video signal input from the video input means and the three or more types of audio signals, and zoom means for performing zoom processing of the video signal recorded in the recording means during reproduction And a reproduction audio signal processing means for generating two or more kinds of signals by reading out three or more kinds of audio signals recorded in the recording means from the zoom means based on a zoom signal and changing a mixing ratio. And

  The recording / reproducing method of the present invention is a recording / reproducing method of audio signals from a plurality of microphones, and an audio signal processing step of generating three or more types of audio signals from the plurality of audio signals from the plurality of microphones; The method further comprises a step of separately recording the three or more types of audio signals and a reproduction audio signal processing step of reading the three or more types of recording signals during reproduction and generating two or more types of signals.

  The recording / reproducing method of the present invention is a method for recording / reproducing an audio signal from a plurality of microphones and a video signal from an image input means, and includes at least three types of two or more types of audio signals from the plurality of microphones. An audio signal processing step for generating an audio signal, a recording step for separately recording the video signal input from the video input means and the three or more types of audio signals, and a video signal recorded in the recording step during reproduction A zoom step for performing the zoom process, and a reproduction audio signal processing step for reading out the three or more types of recorded audio signals based on the zoom signal from the zoom step and generating two or more types of signals by changing the mixing ratio It is characterized by having.

  According to the present invention, it is possible to reduce the size and weight by realizing the audio zoom function with one type of microphone, and it is possible to realize the function at low cost. In addition, even when the left and right images are zoomed, it is possible to perform optimum audio zoom.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
The first embodiment is based on FIGS. 1, 2, 3, 4, 5, 6, and 7, taking as an example the left / right spread / recording by front sound + change sound directivity during playback + display method. explain.

  FIG. 1 is a block diagram of a recording / reproducing apparatus to which the present invention is applied. In FIG. 1, reference numeral 1 denotes an Lch microphone unit that takes in a left audio signal, 2 denotes an Rch microphone unit that takes in a right audio signal, and 3 denotes an audio signal. The microphone amplifiers 1 and 4 for amplifying the sound signal are the microphone amplifier units 2 and 5 for amplifying the sound signal, and the sound signal processing unit for dividing the output signal of the microphone amplifier part into right sound, left sound and front sound, 6 is an audio A / D unit for A / D converting the output signal of the audio signal processing unit, 7 is a display unit for informing the user of the direction of audio during playback, and 8 is for controlling peripheral circuits. The microcomputer unit 9 is a recording signal processing unit that outputs the output signal of the audio A / D unit to the recording medium according to the format of the recording medium, and 10 is that the user changes the directionality of the audio during playback. The operation unit 11 is capable of reproducing the output signal from the reproduction signal processing unit, the audio D / A unit for D / A, and the reproduction unit 12 is for collecting the output signal of the recording unit into the right audio and the left audio. The signal processing unit 13 is a recording unit for recording audio data, 14 is an amplifier unit for amplifying the output signal of the audio D / A unit, and 15 is an audio unit for outputting the output signal of the amplifier unit as audio. It is an output unit.

  FIG. 2 shows a specific example of signal processing in the recording system when two microphones are used. In FIG. 2, 16 is a left audio signal processing unit that generates left audio from the output signals of the 3 microphone amplifier unit 1 and 4 microphone amplifier unit 2, and 17 is a right audio from the output signals of the 3 microphone amplifier unit 1 and 4 microphone amplifier unit 2. The right audio signal processing unit 18 generates front audio from the output signals of the 3 microphone amplifier unit 1 and the 4 microphone amplifier unit 2, and 19 performs A / D on the 5 left signal signal processing unit. Audio A / D units 1 and 20 are audio A / D units 2 for A / D 6 right audio signal processing units, and audio A / D unit 3 for A / D 7 front audio signal processing units.

  FIG. 3 shows a specific example of the recording signal processing unit. 22 is a digital data input unit for inputting a signal of the audio A / D unit 1, 23 is a digital data input unit 2 for inputting a signal of the audio A / D unit 2, and 24 is a signal of the audio A / D unit 3. The digital data input units 3 and 25 are memory units for temporarily storing 1 digital data input unit 1, 2 digital data input unit 2 and 3 digital data input unit 3.

  FIG. 4 shows a specific example of the reproduction signal processing unit. 26 is a memory unit that temporarily stores audio data output from the recording unit during reproduction, 27 is an Rch data output unit 1 that outputs an Rch audio signal, and 28 is an Lch that outputs an Lch audio signal. The data output units 2 and 29 output front audio, and the Cch data output units 3 and 30 generate Rch signals in FIG. 1 from the signals of the 2 digital data output units 1 and 4 digital data output unit 3. The data MIX unit 31 is an Lch data MIX unit that generates an Lch signal from the signals of the 3 digital data output unit 2 and the 4 digital data output unit 3.

  5 and 6 are graphs of specific MIX ratios of the Rch data MIX unit 30 and the Lch data MIX unit 31 in FIG. 4, and a plane XZ in FIG. 5 is a plane when the audio zoom is not performed. The Y-axis direction is the audio zoom direction, the side FG in FIG. 5 is a specific position when audio zoom is not performed, the side DE in FIG. 5 is the maximum audio zoom position, and O in FIG. 5 is X = Y = 0. 5, point A in FIG. 5 is the position where the audio zoom is desired, H in FIG. 5 is the intersection of the lines OA and DEFG, B in FIG. 5 is a point on the side GH and is OA⊥AB, Point C is a point on the side FH and is OAＯAC, and the lengths of OB and OC in FIG. 5 are equal. At this time, the vector OB in FIG. 5 is generated and output from the RchMIX section in FIG. 4, and the vector OC in FIG. 5 is output from the LchMIX section in FIG. The vector OB is composed of the Rch data vector OJ and the Cch data vector OL shown in FIG. 6, and the vector OC is composed of the Lch data vector OI and the Cch data vector OK shown in FIG.

  FIG. 7 is a display example for a device equipped with an audio-only zoom function. The 32 display screen 1 in FIG. 7 is a display screen without zooming, and the 33 display screen 2 in FIG. It is a figure at the time of zooming the rectangular frame part in a display screen. The 34 rectangular frame at the lower right of the 33 display screen 2 in FIG. 7 is superimposed on the image to indicate the zoomed position of the 32 display screen 1 in FIG.

  Hereinafter, the operation of each part of the voice directivity changing function will be described with reference to FIG. The operation of each unit is controlled by the microcomputer unit 8 according to the procedure shown in FIG.

  First, when an audio signal is input to the 1Lch microphone unit of FIG. 1 and the 2Rch microphone unit of FIG. 1, it is converted into an electrical signal, and the signal is converted by the 3 microphone amplifier unit 1 of FIG. 1 and the 4 microphone amplifier unit 2 of FIG. Amplified and transmitted to the five audio signal processing unit in FIG. 1, the left audio is generated by the 16 left signal signal processing unit of FIG. 2, the right audio is generated by the 17 right audio signal processing unit of FIG. 2, and the 18 front audio signal of FIG. A front voice is generated by the generation unit (S101).

  Three types of signals are converted into digital signals by the 6-voice A / D unit shown in FIG. 1, and transmitted to the 9 recording signal processing unit shown in FIG. In the 9 recording signal processing unit of FIG. 1, three types of signals are received by the 22 digital data input unit 1 of FIG. 3, the 23 digital data input unit 2 of FIG. 3, and the 24 digital data input unit 3 of FIG. 3 is recorded in the 25 memory section, and is recorded in the 13 recording section in FIG. 1 according to the recording format by the control signal from the 8 microcomputer section in FIG. 1 (S102).

  When the user selects a playback command using the 7 operation unit in FIG. 1 and changes the sound directivity during playback (S103), the 8 microcomputer unit in FIG. 1 adds the playback command and zoom to the 12 playback signal processing unit in FIG. Send control signals for magnification and voice position. In the 12 reproduction signal processing unit in FIG. 1, the audio signal sent from the 13 recording unit in FIG. 1 is once stored in the 26 memory unit in FIG. 4, and the right audio signal is sent to the 27Rch data output unit in FIG. The left audio signal is simultaneously output to the 28Lch data output unit in FIG. 4, and the front audio signal is simultaneously output to the 29Cch data output unit in FIG. The left and right voices are transmitted in the 30Rch data MIX part of FIG. 4 and the 31Lch data MIX part of FIG. 4 according to the zoom magnification and the voice position information received from the 8 microcomputer part of FIG. Generate. The signal is amplified by the 14 amplifier unit of FIG. 1, and the signal is output by the 15 audio output unit of FIG. 1 (S104). At this time, a display like the 32 display screen of FIG. 7 is displayed on the 7 display section of FIG. 1 to inform the user of the audio position information.

(Second Embodiment)
A second embodiment that changes the directivity of sound in conjunction with a video signal will be described with reference to FIG. In FIG. 8, 34 is a video signal input unit for inputting a video signal, 35 is a recording signal processing unit for outputting three or more types of audio signals and video signals to the recording medium according to the format of the recording medium, and 36 is an audio signal. A recording unit for recording data and video data.

  Hereinafter, the operation of each part of the voice directivity changing function linked to the camera image will be described with reference to FIG. When an audio signal is input to the 1 Lch microphone unit of FIG. 8 and the 2Rch microphone unit of FIG. 8, it is converted into an electrical signal, and the signal is amplified by the 3 microphone amplifier unit 1 of FIG. 8 and the 4 microphone amplifier unit 2 of FIG. Then, it is transmitted to the five audio signal processing unit in FIG. 8, the left audio is generated by the 16 left signal signal processing unit of FIG. 2, the right audio is generated by the 17 right audio signal processing unit of FIG. 2, and the 18 front audio signal of FIG. Front generation voice is generated by the generation unit. The three types of signals and the video signal are converted into digital signals by the 6 audio A / D unit in FIG. 8 and transmitted to the 9 recording signal processing unit in FIG. The video signal input simultaneously with the sound is input to the 35 recording signal processing unit in FIG.

  The 35 recording signal processing unit in FIG. 8 records three types of audio signals and video signals in the 36 recording unit in FIG. 8 in accordance with the recording format by the control signal from the 8 microcomputer unit in FIG. When the user selects a playback command with the 7 operation unit in FIG. 8 and performs video zoom during playback, the 8 microcomputer unit in FIG. 8 sends the playback command, zoom magnification, and audio position to the 12 playback signal processing unit in FIG. Send a control signal. In the 12 reproduction signal processing unit in FIG. 8, the audio signal sent from the 13 recording unit in FIG. 8 is once stored in the 26 memory unit in FIG. 4, and the audio signal in the right direction is sent to the 27Rch data output unit in FIG. The left audio signal is simultaneously output to the 28Lch data output unit in FIG. 4, and the front audio signal is simultaneously output to the 29Cch data output unit in FIG. 8 according to the zoom magnification and the audio position information received from the 8 microcomputer unit in FIG. 8 and the left and right audios in the 30 Lch data MIX unit in FIG. 4 and the 31 Lch data MIX unit in FIG. Generate. The signal is amplified by the 14 amplifier unit of FIG. 8, and the signal is output by the 15 audio output unit of FIG. At this time, the display as shown in FIG. 7 is displayed on the 7 display section of FIG. 8 to inform the user of the audio position information.

It is a block diagram of a recording / reproducing apparatus to which the present invention is applied. It is a figure which shows the specific example of the signal processing of the recording system at the time of using two microphones. It is a figure which shows the specific example of the signal processing part for recording. It is a figure which shows the specific example of the signal processing part for reproduction | regeneration. 5 is a graph of a specific MIX ratio of the 30Rch data MIX portion of FIG. 5 is a graph of a specific MIX ratio of the 31Lch data MIX portion of FIG. It is an example of a display for showing a zoom position to a user. FIG. 6 is a diagram illustrating a second embodiment. It is a flowchart which shows the control procedure of the voice directivity change function which concerns on this invention.

Explanation of symbols

1 Lch microphone part 2 Rch microphone part 3 Microphone amplifier part 1
4 Microphone amplifier 2
5 Audio signal processing unit 6 Audio A / D unit 7 Display unit 8 Microcomputer unit 9 Recording signal processing unit 10 Operation unit 11 Audio D / A unit 12 Playback signal processing unit 13 Recording unit 14 Amplifier unit 15 Audio output unit 16 Left signal Signal processing unit 17 Right signal signal processing unit 18 Front audio signal processing unit 19 Audio A / D unit 1
20 Voice A / D part 2
21 Voice A / D part 3
22 Digital data input section 1
23 Digital data input part 2
24 Digital data input section 3
25 Memory Unit 26 Memory Unit 27 Rch Data Output Unit 28 Lch Data Output Unit 29 Cch Data Output Unit 30 Rch Data MIX Unit 31 Lch Data MIX Unit 32 Display Screen 1
33 Display screen 2
34 Video signal input unit 35 Recording signal processing unit 36 Recording unit

Claims (8)

Multiple microphones,
Audio signal processing means for generating three or more types of audio signals from a plurality of audio signals from the plurality of microphones;
Means for separately recording the three or more types of audio signals;
A recording / reproducing apparatus comprising a reproduction audio signal processing means for reading out the three or more types of recording signals during reproduction and generating two or more types of signals.   2. The recording / reproducing apparatus according to claim 1, wherein the audio signal processing means generates three or more types of audio signals having different directivity characteristics.   3. The recording / reproducing apparatus according to claim 2, wherein the reproduction signal processing means has means for selecting two or more mixing ratios having two or more kinds of mixing ratios.   The recording / reproducing apparatus according to claim 1, wherein the plurality of microphones are two or more microphones having no directivity. Multiple microphones,
Audio signal processing means for generating three or more types of audio signals from two or more types of audio signals from the plurality of microphones;
Video input means for inputting a video signal;
Recording means for separately recording the video signal input from the video input means and the three or more types of audio signals;
Zoom means for zooming the video signal recorded in the recording means during reproduction;
A reproduction audio signal processing means for generating two or more kinds of signals by reading out three or more kinds of audio signals recorded in the recording means based on a zoom signal from the zoom means and changing a mixing ratio is provided. Recording / playback device.   6. The recording / reproducing apparatus according to claim 5, wherein the plurality of microphones are two or more microphones having no directivity. A method for recording and reproducing audio signals from a plurality of microphones,
An audio signal processing step of generating three or more types of audio signals from a plurality of audio signals from the plurality of microphones;
Recording the three or more types of audio signals separately;
A recording / reproduction method comprising a reproduction audio signal processing step of reading out the three or more types of recording signals during reproduction and generating two or more types of signals. A method of recording and reproducing audio signals from a plurality of microphones and video signals from video input means,
An audio signal processing step of generating three or more types of audio signals from two or more types of audio signals from the plurality of microphones;
A recording step of separately recording the video signal input from the video input means and the three or more types of audio signals;
A zoom step of performing zoom processing of the video signal recorded in the recording step during reproduction;
A recording / reproduction comprising a reproduction audio signal processing step of reading out the three or more types of recorded audio signals based on a zoom signal from the zoom step and generating two or more types of signals by changing a mixing ratio Method.

Images