JP2012048089A - Overlap recording apparatus, overlap recording method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a playback level to be appropriately set for overlap recording of input audio and played-back audio overlapping each other.SOLUTION: An overlap recording apparatus comprises a playback processing unit that plays back sound source data in accordance with a set playback level; a recording processing unit that generates recording data on the basis of signals in which input audio signals and played-back audio signals output from the playback processing unit are overlapped and causes the generated recording data to be recorded on a recording medium; an overlap frequency judging unit that judges how many times recording has been overlapped; and a level setting unit that so sets the playback level in the playback processing unit that the playback level increases with an increase in the judged frequencies of overlaps.

Description

  The present invention relates to overdubbing in which input audio is superimposed on recorded audio, and more particularly to overdubbing in which the reproduction level of reproduced audio is set appropriately.

  In music production sites and the like, a mixing operation for superimposing (mixing) a plurality of sounds is widely performed. In a mixing work for the purpose of producing high-quality music such as commercial music, a multi-track recorder (MTR: Multi Track Recorder) configured as shown in FIG. 8A is generally used. In a multi-track recorder, music parts are recorded individually in advance corresponding to a plurality of tracks, and mixing is performed while adjusting the respective volume levels. At this time, timbre processing and sound effects may be applied, multi-channel processing, localization processing, or the like may be performed.

  On the other hand, when high-level mixing is not required to use a multitrack recorder, a technique called overlap recording is often used. Overlap recording does not assign individual parts to independent tracks for mixing, but records input audio superimposed on playback audio. Then, a music file of a polyphonic part can be generated by recording the over-recorded voice as the playback voice and further superimposing the input voice. “Voice part” means a voice of a musical instrument, a song or the like recorded by one over recording.

  Overlapping recording can easily perform mixing work, and as described in Patent Document 1, an overdubbing apparatus for performing overdubbing has been put into practical use. FIG. 8B is a block diagram showing a schematic configuration of a conventional overlap recording apparatus.

  As shown in the figure, the overlap recording device generates an overlap recording file 330 by recording the input sound from the input device 310 such as a microphone and the playback sound of the playback sound source file 320 in a superimposed manner (mixed). To do. By using the superimposed recording file 330 as the reproduction sound source file 320, the input sound can be further superimposed.

  In the overlap recording apparatus, the input sound is level-adjusted by an input level setting unit 340 such as a variable attenuator, and the reproduction sound is also level-adjusted by a reproduction level setting unit 350 such as a variable attenuator and then superimposed by an adder 360.

JP 2004-15461 A

  Overlapping recording is performed by superimposing voices one by one. Therefore, even if the volume balance of each voice part is not appropriate as a result of recording, the level of each voice cannot be adjusted later. For this reason, it is necessary to appropriately set the input level and the playback level during recording.

  However, it is not easy to set the input level and the reproduction level appropriately. In particular, the input level (recording level) is set even in normal recording, whereas the playback level is a setting specific to overlap recording, so the user is often unfamiliar. For this reason, if it is left to the user to set the playback level, repeated recording may be performed through trial and error, increasing the burden on the user. On the other hand, if the playback level is simply fixed, a problem may arise in the volume balance of each voice part in the process of repeating overdubbing. This is because the first recorded voice part is repeatedly re-recorded and buried.

  Accordingly, an object of the present invention is to enable appropriate setting of a playback level in overdubbing in which input audio and playback audio are recorded in an overlapping manner.

  In order to solve the above problems, an overlap recording apparatus according to a first aspect of the present invention includes a reproduction processing unit that reproduces sound source data in accordance with a set reproduction level, an input audio signal, and reproduction audio that is output from the reproduction processing unit. A recording processing unit that generates recording data based on a signal superimposed with the signal, and records the generated recording data on a recording medium; an overlapping number determination unit that determines the number of overlapping recordings; and the determined number of overlappings And a level setting unit for setting the playback level in the playback processing unit so that the playback level increases as the number of playbacks increases.

  The recording data generated by the recording processing unit further includes an overlap number information adding unit for adding information indicating the number of overlaps, and the overlap number determining unit indicates the number of overlaps added to the sound source data. You may make it determine the frequency | count of superposition recording based on information.

  The input level adjustment unit further adjusts the input level of the input audio signal according to the set input level, and the level setting unit is configured to reduce the input level as the determined number of overlaps increases. The input level in the input level adjustment unit can be set.

  At this time, the level setting unit sets the reproduction level and the input level at a ratio with respect to the original signal level. When the number of overlaps is K + 1, the product of the reproduction level up to K + 1 and the input level of K + 1 And the playback level and the input level can be set so that.

  The automatic level adjustment unit further adjusts an input level so that the input audio signal does not exceed a reference value, and the level setting unit adjusts the automatic level adjustment so that the level is reduced as the determined number of overlaps increases. You may make it set the reference value in a part.

  In order to solve the above-described problem, the recording method according to the second aspect of the present invention includes a reproduction step of reproducing sound source data in accordance with a set reproduction level, an input audio signal, and an output of the reproduction processing unit. A recording step for generating recording data based on a signal obtained by superimposing the reproduced audio signal, a recording step for recording the generated recording data on a recording medium, an overlapping number determining step for determining the number of overlapping recordings, and a determined overlapping And a level setting step for setting the playback level in the playback step so that the playback level increases as the number of times increases.

  In order to solve the above-described problem, a computer program according to a third aspect of the present invention includes a reproduction processing unit that reproduces sound source data according to a set reproduction level, an input audio signal, and a reproduction audio signal output by the reproduction processing unit. And a recording processing unit for recording the generated recording data on a recording medium, an overlapping number determining unit for determining the number of overlapping recordings, and the determined number of overlappings. The information processing apparatus is caused to function as a level setting unit that sets the reproduction level in the reproduction processing unit so that the reproduction level increases as the number increases.

  According to the present invention, it is possible to appropriately set the reproduction level in the overdubbing recording in which the input sound and the reproduced sound are superimposed.

It is a block diagram which shows the structure of the overlap recording apparatus which concerns on 1st Embodiment of this invention. It is a figure explaining the setting process of the reproduction level in a reproduction level setting part. It is a flowchart explaining the overlap recording operation | movement of the overlap recording apparatus in 1st Embodiment. It is a block diagram which shows the structure of the overlap recording apparatus which concerns on 2nd Embodiment of this invention. It is a figure explaining the setting process of the input level and reproduction | regeneration level in an input and reproduction | regeneration level setting part. It is a flowchart explaining the overlap recording operation | movement of the overlap recording apparatus in 1st Embodiment. It is a block diagram which shows the structure at the time of using ALC instead of an input level adjustment part. It is a block diagram which shows the structure of a multitrack recorder and the conventional overlap recording apparatus.

<First Embodiment>
Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the overlap recording apparatus according to the first embodiment of the present invention. As shown in the figure, the overlap recording apparatus 10 includes an audio input unit 110, an input level setting unit 120, an input level adjustment unit 130, a reproduction processing unit 140, an overlap number determination unit 150, a reproduction level setting unit 160, and a recording processing unit. 170, an overlap count information adding unit 180, and a recording medium 190.

  The overlap recording device 10 may be configured as a dedicated device such as an IC recorder, or may be configured using an information processing device including a CPU, memory, input / output interface, decoder / encoder, display device, operation keys, power supply, and the like. it can. In this case, the CPU executes various programs described in the first and second embodiments by executing a program recorded in the memory.

  The recording medium 190 is a storage area for storing the overlap recording file 192 and the reproduction sound source file 191. The reproduced sound source file 191 is a sound source file used for overlap recording, and a sound obtained by superimposing the input sound on the sound reproduced based on the reproduced sound source file 191 is recorded as the overlap recording file 192. The recording medium 190 may be a fixed type built in the overlap recording device 10 or may be detachable like a memory card. The format of the sound source of the overlap recording file 192 and the playback sound source file 191 can be any format, for example, an uncompressed format such as linear PCM or a compressed format such as mp3. Alternatively, analog audio data may be used.

  The audio input unit 110 is a block for inputting newly recorded audio. In the present embodiment, the audio input unit 110 includes a microphone 111 and a microphone amplifier 112 that amplifies an audio signal output from the microphone 111 to an appropriate range. The The voice input unit 110 may be built in the overlap recording device 10 or may be configured by connecting an external device.

  The input level adjustment unit 130 can be configured using a variable attenuator or the like, and attenuates and outputs the audio signal input from the audio input unit 110 according to the setting of the input level setting unit 120.

  In the present embodiment, the level of the signal that is attenuated and output by the input level adjustment unit 130 is expressed with reference to the level of the signal input to the input level adjustment unit 130. Specifically, the level of the signal output from the input level adjustment unit 130 is represented by a ratio (input / output ratio) where the level of the signal input to the input level adjustment unit 130 is 100% (= 1). . Therefore, for example, when the input / output ratio in the input level adjusting unit 130 is set to 70% as the input level, the original signal level is attenuated to 70%, and the input / output in the input level adjusting unit 130 is set as the input level. If the ratio is set to 50%, the original signal level will be attenuated to 50%. However, the method of expressing the level of the signal that is attenuated and output by the input level adjustment unit 130 is not limited to the input / output ratio in the input level adjustment unit 130, and an attenuation factor, an attenuation amount, and other indicators may be used.

  The input level setting unit 120 sets the input level, that is, the input / output ratio of the input level adjustment unit 130. In the first embodiment, the input level is set by a user operation. That is, the user can adjust the input level so that the voice to be input is recorded in an appropriate range when performing overdubbing.

  The user sets the input level by, for example, referring to an input level value and a level meter displayed on a display device (not shown) and operating the cursor button to raise or lower the input level value. Generally, the input level is set to be smaller as the input sound is larger, and the input level is set to be larger as the input sound is smaller, so that recording can be performed at as high a level as possible without causing the input sound to overflow. The overlap recording device 10 may be provided with an automatic level controller (ALC) function, and the input bell may be automatically adjusted according to the user's selection. In this case, the input level is automatically adjusted so that the maximum volume of the input sound does not exceed the overflow level.

  The reproduction processing unit 140 reproduces the reproduction sound source file 191 into an audio signal. The reproduced audio signal is output to the recording processing unit 170 and can be output from an earphone or the like, and the user can input the superimposed sound while listening to the reproduced sound.

  In addition, the reproduction processing unit 140 includes a reproduction level adjustment unit 141. The playback level adjustment unit 141 can be configured using a variable attenuator, a digital audio processing device, or the like, and an audio signal that the playback processing unit 140 plays based on the playback sound source file 191 according to the setting of the playback level setting unit 160. Attenuate and output.

  In the present embodiment, the level of the signal that is attenuated and output by the reproduction level adjustment unit 141 is represented with reference to the level of the signal recorded in the reproduction sound source file 191. Specifically, the level of the signal recorded in the reproduction sound source file 191 is expressed as a ratio (input / output ratio) with 100% (= 1). Therefore, for example, when the input / output ratio in the playback level adjusting unit 141 is set to 70% as the playback level, the original signal level is attenuated to 70%, and the input / output in the playback level adjusting unit 141 is set as the playback level. If the ratio is set to 50%, the original signal level will be attenuated to 50%. However, how to express the level of the signal attenuated and output by the reproduction level adjustment unit 141 is not limited to the input / output ratio in the reproduction level adjustment unit 141, and an attenuation factor, an attenuation amount, and other indicators may be used.

  The playback level setting unit 160 sets the playback level, that is, the input / output ratio of the playback level adjustment unit 141. In the first embodiment, the playback level setting unit 160 automatically sets an appropriate playback level value according to the number of overlays in overlay recording. As described above, in the present embodiment, the reproduction level is changed according to the number of overlapping times. Details of the playback level setting of the playback level setting unit 160 will be described later. Note that after the playback level setting unit 160 automatically sets the playback level, the playback level adjustment by the user may be accepted.

  Note that the input level setting unit 120 and the reproduction level setting unit 160 may perform the input level setting and the reproduction level setting in one block instead of separate blocks.

  The recording processing unit 170 includes a speech synthesis unit 171 composed of an adder or the like, and an input speech signal whose level is adjusted by the input level adjustment unit 130 and a playback speech signal whose level is adjusted by the playback level adjustment unit 141. Are superimposed (added) and output, and a superimposed recording file 192 is generated. That is, the recording processing unit 170 generates recording data based on the superimposed signal and stores it in the recording medium 190 as the overlapping recording file 192.

  Note that each processing in the input level adjustment unit 130, the reproduction level adjustment unit 141, the voice synthesis unit 171 and the like may use either a digital voice signal or an analog voice signal. Here, after the analog audio signal from the audio input unit 110 is level-adjusted by the input level adjustment unit 130, it is digitally converted by the recording processing unit 170, and the digital level is adjusted by the reproduction level adjustment unit 141 as it is as a digital audio signal. It is assumed that the reproduction signal is synthesized with the voice synthesis unit 171.

  The overlap number information adding unit 180 adds information indicating the number of overlaps to the overlap recording file 192 generated by the recording processing unit 170. The number of overlaps is the number obtained by adding 1 to the number of overlaps of the reproduction sound source file 191 used for overlap recording.

  Information indicating the number of overlaps can be added, for example, by attaching a file name including the number of overlaps to the overlap recording file 192. Alternatively, the number of overlaps may be recorded in the overlap recording file 192 as tag information.

  The overlap count determination unit 150 determines the overlap count based on the information indicating the overlap count added to the reproduction sound source file 191. At the time of overdubbing, the number of times of overlap is the number obtained by adding 1 to the number of overlaps added to the reproduction sound source file 191 as described above. If the reproduction sound source file 191 does not include information indicating the number of times of overlap, the overlap recording is determined as the first number of overlaps. The determined number of overlaps is output to the playback level setting unit 160. The reproduction level setting unit 160 sets the reproduction level of the reproduction sound source file 191, that is, the input / output ratio in the reproduction level adjustment unit 141 based on the number of overlaps.

  Details of the playback level setting process performed by the playback level setting unit 160 in the first embodiment will be described with reference to FIG. In this example, it is assumed that four original recordings are performed on “original voice 0”. For simplicity, it is assumed that the input sound volume is almost constant each time and is about the same as “original voice 0”. It is also assumed that the input level setting by the user is constant. This is because the input level is generally not changed when recording voice parts having the same volume.

  First, let us consider a case where the input / output ratio in the playback level adjustment unit 141 is fixed at 50% as a playback level setting in order to overlap the playback sound and the input sound at the same rate. The input level is also fixed at an input / output ratio of 50% in the input level adjustment unit 130. That is, the playback level adjustment unit 141 attenuates and outputs the level of the audio signal based on the playback sound source file 191 to 50%, and the input level adjustment unit 130 sets the level of the audio signal input from the audio input unit 110 to 50. The output is attenuated to%.

  As a result, as shown in FIG. 2A, in the first overlap recording, “original voice 0” and “new recording 1 (voice 1)” are recorded at the same rate with respect to the recording result. become. Therefore, “original voice 0” and “voice 1” have the same volume.

  However, in the second overlap recording, since “new recording 2 (voice 2)” is recorded on the first overlapping recording result, “new recording 2 (voice 2)” is recorded on the recording result. Recorded at a rate of 50%, “original voice 0” and “voice 1” are each 1/4 (= 25%: below, in percent and fractional cases as required) )). For this reason, “original voice 0” and “voice 1” have lower volumes than “voice 2”.

  Furthermore, in the third overdubbing recording, “new recording 3 (voice 3)” is recorded at a rate of 50% with respect to the recording result, whereas “voice 2” is a ratio of 1/4, “Original voice 0” and “voice 1” are recorded as small as 1/8. Therefore, “voice 2” has a lower volume than “voice 3”, and “original voice 0” and “voice 1” have a lower volume.

  The same is true for the fourth overlap recording, and as the number of overlaps increases, the previously recorded voice becomes smaller and the volume balance between voice parts becomes worse. As a result, when recording the performance of one musical instrument for each overlap recording, the volume balance between the musical instruments is distorted.

  Therefore, as shown in FIG. 2B, the playback level setting unit 160 of the first embodiment increases the playback level as the number of overlaps increases, that is, sets the input / output ratio in the playback level adjustment unit 141. Increase the setting to reduce the amount of attenuation. As a result, as shown in FIG. 2C, even if the input level does not change, the ratio of the previously recorded voice to the recording result can be relatively increased. For this reason, it can prevent that the volume balance between voice parts worsens as the number of overlapping increases. Since the playback level increases as the number of overlaps increases, if the input level does not change, the volume of the recording result as a whole will increase.

  Even when the input level is changed by the user, the playback level is set higher as the number of overlaps increases, so that it is possible to prevent the previously recorded voice from becoming too small, and as the number of overlaps increases. It is possible to prevent the volume balance between voice parts from being deteriorated.

  The extent to which the input / output ratio in the playback level adjusting unit 141 is increased according to the number of times of overlap can be determined flexibly according to the characteristics such as the dynamic range of the overlap recorder 10 and the purpose of use. Since the input / output ratio in the reproduction level adjustment unit 141 cannot be increased indefinitely, it may be set to a fixed value when a certain number of overlaps is exceeded.

  Next, the overlap recording operation of the overlap recording apparatus 10 in the first embodiment will be described with reference to the flowchart of FIG.

  At the start of the overlap recording operation, the overlap recording apparatus 10 specifies the reproduction sound source file 191 used for the overlap recording (S101). The reproduction sound source file can be specified, for example, by accepting the user's selection from the sound source files recorded on the recording medium 190.

  Then, with reference to the overlap number information added to the selected reproduction sound source file, the overlap number determination unit 150 determines the number of overlaps in the current overlap recording (S102). As described above, the number of overlaps in the current overlap recording is obtained by adding 1 to the number of overlaps indicated by the overlap number information added to the reproduction sound source file 191.

  When the number of overlaps is determined, a playback level is set based on the number of overlaps (S103). The reproduction level is set by the reproduction level setting unit 160 such that the input / output ratio in the reproduction level adjustment unit 141 increases as the number of overlaps increases. At this time, the reproduction level setting unit 160 may set the input / output ratio according to a predetermined relational expression, or may set the input / output ratio according to a table created in advance.

  In addition, an input level setting is received from the user (S104). The input level setting can be accepted at any timing, including during over-recording, and can be reflected in the input level value in real time. If the ALC function is provided, the input level may be automatically set so that the input sound does not overflow. In this case, the user can select automatic setting or manual setting of the input level.

  When the playback level is set by the playback level setting unit 160, playback / recording is started (S105). The reproduced sound is output to an earphone or the like and can be listened to by a user who inputs the sound. In addition, the recording processing unit 170 newly creates an overlapping recording file 192 (S106). At this time, the overlap number information adding unit 180 adds the overlap number information to the overlap recording file 192.

  After that, until an instruction to end overdubbing is received from the user (S109: Yes), voice input via the voice input unit 110 is performed (S107), and the recording processing unit 170 combines the input voice and the reproduced voice. The recording (S108) of the synthesized voice to the overdubbing file 192 is repeated (S109: No).

  At this time, the input level adjustment unit 130 adjusts the level for the input sound according to the input level set by the user, and the playback level according to the playback level set by the playback level setting unit 160 for the playback sound. The reproduction level adjustment unit 141 adjusts the level with the input / output ratio.

  As described above, according to the first embodiment, the playback level is set so as to increase as the number of overlaps increases, so that it is possible to prevent the volume balance between voice parts from becoming worse as the number of overlaps increases. it can. Therefore, it is possible to perform overdubbing with the playback level appropriately set. In the present embodiment, the reproduction level setting unit 160 sets the input / output ratio in the reproduction level adjustment unit 141 so that the input / output ratio increases as the number of overlaps increases. As a result, the reproduction level is set to increase as the number of overlaps increases.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram showing the configuration of the overlap recording apparatus according to the second embodiment of the present invention. The same blocks as those in the first embodiment are denoted by the same reference numerals, and the description is simplified. Also in the second embodiment, the reproduction level is adjusted by changing the input / output ratio in the reproduction level adjusting unit 141, and the input level is adjusted by changing the input / output ratio in the input level adjusting unit 130. Shall be performed in

  As shown in the figure, the overlap recording device 10a includes a voice input unit 110, an input level adjustment unit 130, a reproduction processing unit 140, an overlap number determination unit 150, a recording processing unit 170, an overlap number information addition unit 180, and a recording medium 190. The input / playback level setting unit 200 is provided.

  The overlap recording apparatus 10a according to the second embodiment differs from the overlap recording apparatus 10 according to the first embodiment in that an input / playback level setting unit 200 is replaced with the input level setting unit 120 and the playback level setting unit 160. It is a point that has. That is, the overlap recording apparatus 10a according to the second embodiment sets not only the playback level but also the input level according to the number of overlaps. However, after setting the playback level and input level, it may be possible to accept a change in level value from the user. Further, the input / playback level setting unit 200 may be divided into a block for setting an input level and a block for setting a playback level.

  FIG. 5 shows a reproduction level and input level setting process performed by the input / reproduction level setting unit 200 in the second embodiment, that is, an input / output ratio in the reproduction level adjustment unit 141 and an input / output ratio setting process in the input level adjustment unit 130. Will be described with reference to FIG. Also in this example, it is assumed that four times of “original voice 0” are recorded, and that the volume of the input voice is almost the same every time and is about the same as “original voice 0”.

  Further, in order to surely avoid the overflow of the synthesized speech of the appropriate level of reproduced audio and the appropriate level of input audio, the total value of the input / output ratios corresponding to the reproduced level and the input level is 100% (= 1) ).

  If both the playback audio signal and the input audio signal have a volume up to the overflow limit, if the total value of the input / output ratio corresponding to the playback level and the input level exceeds 100%, an overflow occurs due to the overlay addition. In reality, however, it is rare that the input audio signal and the reproduced audio signal simultaneously have a volume up to the overflow limit. Therefore, even if the total value of the input / output ratios corresponding to the reproduction level and the input level exceeds 100%, it is considered that the signal level after the addition often does not overflow. A case where the total value of the input / output ratio corresponding to the input level is set to 100% will be described as an example.

  Here, the state where each voice part is recorded with substantially the same volume balance as a result of the overlap recording is considered to be ideal. In order to realize such a state, as shown in FIG. 5A, the input / playback level setting unit 200 determines that “original voice 0” and “new recording 1 (voice) in the first overlap recording result. The playback level and the input level may be set so that “1)” is a ratio of 1/2. That is, the input / output ratio is set to 50% for both the reproduction level and the input level.

  In the second overlap recording result, if the playback level and the input level are set so that “original voice 0”, “voice 1”, and “new recording 2 (voice 2)” have a ratio of 1/3, respectively. Good. That is, the input / reproduction level setting unit 200 sets the input / output ratio in the reproduction level adjustment unit 141 to 2/3 (= 66%) and the input / output ratio in the input level adjustment unit 130 to 1/3 (= 33%). ).

  Further, in the third over-recording result, the playback level and the “original voice 0”, “voice 1”, “voice 2”, and “new recording 3 (voice 3)” are set to ¼. The input / output ratio corresponding to the input level is set, and in the fourth overlap recording result, “original voice 0”, “voice 1”, “voice 2”, “voice 3”, and “new recording 4” are respectively What is necessary is just to set the input / output ratio corresponding to a reproduction level and an input level so that it may become a ratio of 1/5.

  In order to perform such level setting, the input / reproduction level setting unit 200 sets the reproduction level and the input level so as to obtain an input / output ratio as shown in FIG. That is, in the first overlap recording, the playback level and the input level are both attenuated to 50% (= 1/2), and thereafter, the input level is set so that the playback level increases as the number of overlaps increases. Is set so that the input / output ratio in the reproduction level adjusting unit 141 and the input / output ratio in the input level adjusting unit 130 are reduced.

  Here, since the total value of the input / output ratios corresponding to the reproduction level and the input level is set to 100% (= 1), the reproduction level is adjusted in the reproduction level adjustment unit 141 as the number of overlaps increases. The input / output ratio is increased to 1/2, 2/3, 3/4, and 4/5, and the input level is set to 1/2, 1/3, and 1/4 in the input level adjustment unit 130. However, the total value of the input / output ratios corresponding to the reproduction level and the input level is not necessarily 100% (= 1).

  The input / reproduction level setting unit 200 is a level for the input level adjustment unit 130 and the reproduction level adjustment unit 141 such that the total value of the reproduction level and the input / output ratio corresponding to the input level is greater than 100% (= 1). Settings may be made. As described above, the input audio signal and the reproduced audio signal rarely have a volume up to the overflow limit at the same time, and the total value of the input / output ratios corresponding to the reproduction level and the input level exceeds 100%. This is because the signal level after addition often does not overflow.

  In addition, when the maximum volume has a margin for the maximum value of the dynamic range, the total value of the input / output ratio corresponding to the playback level and input level is set to exceed 100% within the range where overflow does not occur. By doing so, the dynamic range of the overlap recording result can be expanded.

  Here, for example, a case where the total value of the input / output ratios corresponding to the reproduction level and the input level is set to be +3 dB (= 141.4%) with respect to 100% (= 1) is taken as an example. In this case, a value as shown in FIG. 5C may be set to the input / output ratio corresponding to the reproduction level and the input level. Also in this case, the input level is set to be small so that the reproduction level becomes large as the number of overlapping times increases.

Furthermore, the total value of the input / output ratios corresponding to the reproduction level and the input level may be changed for each overlap count. In this case, it can be generalized as shown in FIG. Here, a _{k is} the input / output ratio corresponding to the playback level at the time of the k + 1th overlap recording (k is a natural number), b _k is the input / output ratio corresponding to the input level, and the input / output ratio and input level are corresponding to the playback level. The total of the input / output ratios corresponding to is A _k .

In order to obtain a good volume balance, the product of the input / output ratio corresponding to the reproduction level up to the (k + 1) th time and the input / output ratio corresponding to the input level of the (k + 1) th time need to be equal. Is obtained.

Further, the input / output ratio a _k corresponding to the reproduction level, the input / output ratio b _k corresponding to the input level, and the total A _k satisfy the relationship of [Equation 2].

From the above, the input / output ratio a _k corresponding to the reproduction level and the input / output ratio b _k corresponding to the input level can be obtained by [Equation 3].

  By using [Equation 3], it is possible to flexibly set the total value of the input / output ratios corresponding to the reproduction level and the input level according to the number of times of overlapping. The value shown in FIG. 5C is determined so that the total value of the input / output ratios corresponding to the reproduction level and the input level is 141.4% (= + 3 dB) each time, and can be obtained from [Equation 3]. .

  When the total value is changed according to the number of overlaps, for example, when the number of overlaps is small, the total of the input / output ratio is set to around 100% (= 1) to avoid overflow as much as possible, and the number of overlaps increases. In such a case, it is possible to avoid a decrease in sound volume by increasing the total of the input / output ratio. The setting of the input / output ratio corresponding to the input level and the playback level may be calculated every time an input of the total value is received from the user for each overlap recording, or a table may be created in advance. .

  Next, the overlap recording operation of the overlap recording apparatus 10a in the second embodiment will be described with reference to the flowchart of FIG. The description of the same operation as the overlap recording device 10 in the second embodiment will be simplified.

  The overlap recording device 10a specifies the reproduction sound source file 191 used for the overlap recording (S201). Then, with reference to the overlap number information added to the selected playback sound source file, the overlap number determination unit 150 determines the number of overlaps in the current overlap recording (S202).

  When the number of overlaps is determined, a playback level and an input level are set based on the number of overlaps (S203). The reproduction level and the input level are set by the input / reproduction level setting unit 200 such that the larger the number of overlaps, the larger the reproduction level and the smaller the input level, that is, the larger the input / output ratio in the reproduction level adjustment unit 141. As such, the input / output ratio in the input level adjustment unit 120 is set to be small.

  Both the playback level and the input level may be changed by the user after automatic setting. As a result, it is possible to cope with the volume of the input sound or to perform overdubbing according to the user's intention to produce music. For example, if the input sound to be newly recorded is a relatively high volume, it is possible to maintain balance with other voice parts by lowering the input level. If the newly recorded input sound is a solo part, it is possible to make the solo stand out by raising the input level. As described above, even when a change by the user is accepted after the automatic setting, the input level setting unit 120 and the playback level setting unit 160 are automatically set to a level appropriate for over recording by the user first. Can be easily changed to a desired level.

  When the input level and playback level are set by the input / playback level setting unit 200, playback / recording is started (S204). In addition, the recording processing unit 170 newly creates an overlap recording file 192 (S205). At this time, the overlap number information adding unit 180 adds the overlap number information to the overlap recording file 192.

  Thereafter, until an instruction to end overdubbing is received from the user (S208: Yes), voice input through the voice input unit 110 is performed (S206), and the recording processing unit 170 combines the input voice and the reproduced voice. The recording (S207) of the synthesized voice to the overdubbing file 192 is repeated (S208: No).

  As described above, according to the second embodiment, since the input level is set to be small so that the playback level increases as the number of overlaps increases, the volume balance between voice parts increases as the number of overlaps increases. In addition to preventing the sound from getting worse, the volume of each voice is made uniform. Therefore, it is possible to perform overdubbing with the playback level appropriately set.

  As shown in the block diagram of FIG. 7, instead of the input level adjustment unit 130, an ALC (auto level control) unit (automatic level adjustment unit) 132 is used, or the input level adjustment unit 130 and the input level adjustment unit 130 according to the user's selection. The ALC unit 132 may be switched.

  The ALC unit 132 automatically adjusts the input level so that the maximum volume of the input sound does not exceed the volume level called the target level. The target level is normally set to a value slightly smaller than the overflow level. However, the ALC unit 132 of the present embodiment is the target level linked to the input level set by the input / playback level setting unit 200. Take control.

  That is, taking the input level shown in FIG. 5B as an example, the ALC unit 132 sets 1/2 of the normal target level as the target level in the first overdubbing, and in the second overdubbing, One third of the normal target level is set as the target level, and in the third overlap recording, 1/4 of the normal target level is set as the target level, and auto level control is performed. The same applies to subsequent times.

  In this way, by setting the target level to be smaller as the number of overlaps increases, it is possible to appropriately set the playback level and to prevent the input sound from becoming too large compared to the playback sound. .

DESCRIPTION OF SYMBOLS 10 ... Overlapping recording apparatus 10a ... Overlapping recording apparatus 110 ... Audio | voice input part 111 ... Microphone 112 ... Microphone amplifier 120 ... Input level setting part 130 ... Input level adjustment part 132 ... ALC part 140 ... Reproduction processing part 141 ... Reproduction level adjustment part 150 ... Overlap count determination section 160 ... Playback level setting section 170 ... Recording processing section 171 ... Speech synthesis section 180 ... Overlap count information addition section 190 ... Recording medium 191 ... Playback sound source file 192 ... Overlap recording file 200 ... Input / playback level setting section 310 ... Input device 320 ... Playback sound source file 330 ... Overlapping recording file 340 ... Input level setting unit 350 ... Playback level setting unit 360 ... Adder

Claims (7)

A playback processing unit for playing back sound source data according to the set playback level;
A recording processing unit that generates recording data based on a signal obtained by superimposing an input audio signal and a reproduction audio signal output by the reproduction processing unit, and records the generated recording data on a recording medium;
An overlapping number determination unit for determining the number of overlapping recordings;
A level setting unit for setting the playback level in the playback processing unit so that the playback level increases as the determined number of overlaps increases;
An overdubbing apparatus characterized by comprising: The recording data generated by the recording processing unit further includes an overlapping number information adding unit for adding information indicating the number of overlapping,
The overlap recording apparatus according to claim 1, wherein the overlap number determination unit determines the number of overlap recordings based on information indicating the number of overlaps added to the sound source data. An input level adjusting unit that adjusts an input level of the input audio signal according to a set input level;
The multi-level recording apparatus according to claim 1, wherein the level setting unit sets the input level in the input level adjustment unit so that the input level becomes smaller as the determined number of superpositions increases. . The level setting unit includes:
Set the playback level and the input level at a ratio to the original signal level,
4. The reproduction level and the input level are set such that when the number of times of overlap is K + 1, the product of the reproduction levels up to K + 1 and the input level of K + 1 are equal. Recording device. An automatic level adjuster for adjusting an input level so that the input audio signal does not exceed a reference value;
The multi-level recording apparatus according to claim 1, wherein the level setting unit sets a reference value in the automatic level adjustment unit such that the reference value in the automatic level adjustment unit becomes smaller as the determined number of overlapping times increases. A playback step of playing back the sound source data according to the set playback level;
A recording step of generating recording data based on a signal obtained by superimposing an input audio signal and a reproduction audio signal output by the reproduction processing unit, and recording the generated recording data on a recording medium;
An overlap count determination step for determining the overlap count of the overlap recording;
A level setting step for setting the playback level in the playback step so that the playback level increases as the determined number of overlaps increases;
A method of over-recording in a recording apparatus, comprising: A playback processing unit for playing back sound source data according to the set playback level;
A recording processing unit that generates recording data based on a signal obtained by superimposing an input audio signal and a reproduction audio signal output by the reproduction processing unit, and records the generated recording data on a recording medium;
An overlapping number determination unit for determining the number of overlapping recordings;
A computer program for causing an information processing apparatus to function as a level setting unit that sets a reproduction level in the reproduction processing unit so that the reproduction level increases as the determined number of overlaps increases.