JP3675361B2 - Communication terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication terminal such as a mobile phone having a stereo sampling function and a function of reproducing stereo music.
[0002]
[Prior art]
Conventionally, in a mobile communication terminal such as a mobile phone or a PHS, a music file preset in a device, a music file created by a user, or a music file acquired from a server such as a distribution center (SMF (Standard MIDI File), SMAF ( Synthetic music Mobile Application Format) and sequence data files such as MFi) are known to generate ringtones by driving a sound source.
In addition, a sound that has been recorded and registered in advance (the sound to be recorded is not limited to a human voice, but is collectively referred to as “speech” in this specification) is played back as a ringing melody. This is also known (see JP-A-2-78349, JP-A-10-178679, JP-A-10-313351, JP-A-11-88211, etc.).
[0003]
[Problems to be solved by the invention]
When playing a ring melody or the like based on a music file, the music is often selected from the latest hit chart, and the popularity of the music tends to be biased. Therefore, there is a case where it is not possible to identify whether or not the call is received at a place where there is no individuality and many mobile communication terminal owners gather.
In addition, most of the types that play recorded (sampled) voices and use them as incoming ring melodies simply play back the sampled voices as they are. Adding envelopes to the sampled voices and changing the pitch Such processing cannot be performed, and the sampled voice cannot be used as timbre data.
Furthermore, there is no known portable communication device having a function of reproducing stereo-sampled musical tones having a sense of spread.
[0004]
Therefore, an object of the present invention is to provide a communication terminal capable of playing a music having a unique tone and a sense of breadth by making it possible to use stereo-sampled audio as a material of tone color data. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a communication terminal of the present invention is a communication terminal having a control unit, a storage unit, a communication unit, a voice processing unit, a display unit, an operation unit, and a music playback unit. The music playback unit includes a storage means for storing waveform data, an address generator for generating an address signal that changes at a rate corresponding to a specified note number, and an address signal generated from the address generator. An envelope applying unit that adds an envelope to the waveform data read from the storage means , and the audio processing unit has a function of stereo-sampling an audio signal input via two microphones, and the control parts are by storing the voice waveform data the stereo sampling in the storage means, the speech waveform data the stereo sampled from the musical piece reproducing unit Those that are configured to be able to generate a stereo musical sound using.
One of the two microphones is a transmission microphone.
Further, the address generator generates an address signal for repeatedly reading from a predetermined start address to an end address, and the control unit stores the long stream waveform data using the stereo sampled audio waveform data as the material. By sequentially supplying and writing to the already read address area, long stream stereo waveform data can be reproduced from the music reproducing unit .
Still further, there is provided means for generating stereo tone color data using the stereo sampled audio waveform data as a material, and a music piece is reproduced using the generated stereo tone color data.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be applied not only to a mobile communication terminal such as a mobile phone or a PHS but also to a fixed phone, etc. In the following, a case where the present invention is applied to a mobile communication terminal such as a mobile phone or a PHS will be described as an example. .
FIG. 1 is a block diagram showing an example of the overall configuration of a mobile communication terminal according to an embodiment of the present invention.
In this figure, 1 is a central processing unit (system CPU) that controls the entire apparatus, 2 is a control program such as various communication control programs and programs for music playback, preset music files and various constant data, etc. Is stored as a system ROM, 3 is used as a work area and stores various data such as music files and timbre data, 4 is a display unit including a liquid crystal display (LCD), and 5 is a plurality of An operation unit having operation buttons and the like, and a communication unit 6 including a modem unit and the like are connected to the antenna 7. Here, it is desirable that the music file storage area and the timbre data storage area in the system RAM 3 be made non-volatile by using a flash memory or performing battery backup.
Reference numeral 8 is connected to the transmission microphone 9, the microphone 10, and the reception speaker 11, and encodes and decodes an audio signal for a call and simultaneously samples the audio signal input from the microphone 9 and the microphone 10. An audio processing unit (audio CODEC) having a function of capturing, 12 has a sound source, and reproduces music based on a music file stored in the system RAM 3 or the like, and 13 is a speaker used for notification of incoming calls. , 14 is a headphone, 15 is an external interface circuit for exchanging various data with an external device such as a personal computer or another portable communication terminal, and 16 is a bus for transferring data between the components. is there.
[0007]
FIG. 2 shows an example of the internal configuration of the voice processing unit 8. In this figure, 21 is an A / D converter that samples the input voice from the transmission microphone 9 with a sampling clock of a predetermined frequency and converts it into digital data, and 22 is a voice of a predetermined frequency that is input from the microphone 10. An A / D converter that samples by a sampling clock and converts it into digital data, 23, 24, and 25 are buffers, and 26 is audio data from the A / D converter 21 determined by a system such as CELP, VSELP, or ADPCM system. This is a speech encoding unit that encodes the received speech encoding method and outputs it to the communication unit 6.
Reference numeral 27 denotes a voice decoding unit that decodes the voice data demodulated by the communication unit 6 into a baseband signal, and 28 denotes a D / A converter that converts the decoded voice data from the voice decoding unit 27 into an analog signal. , 29 and 30 are buffers, and 31 is a weight for the output audio signal of the D / A converter 28 supplied via the buffer 29 and the music signal from the music playback unit 12 input via the buffer 30. Is an adder that adds and adds to the reception speaker 11.
[0008]
During a call, the transmission voice input from the transmission microphone 9 is sampled by the A / D converter 21 and converted into digital data, and a predetermined encoding is performed by the voice encoding unit 26 via the buffer 23. It is encoded by a method (for example, CELP method) and output to the communication unit 6. The received data from the communication unit 6 is input to the voice decoding unit 27, decoded there, and then converted into an analog signal by the D / A converter 28, and received by the buffer 29 and the adder 31. Output from the speaker 11. At this time, the weight in the adder 31 is, for example, 1 on the buffer 29 side and 0 on the buffer 30 side. The weight of the adder 31 is set to 0.5 for both the buffer 29 side and the buffer 30 side when playing a hold tone, and when the ringing melody is played back in stereo as described later, the buffer 29 side is set to 0. The 30 side is set to 1.
[0009]
Here, in the mobile communication terminal of the present invention, the input sound from the two microphones of the microphone 9 and the microphone 10 can be captured by stereo sampling. That is, for example, an audio signal input from the transmission microphone 9 corresponding to one stereo channel (for example, the left channel (L-ch)) is sampled by the A / D converter 21 at a predetermined sampling period. And convert it to digital data. At the same time, the input signal from the microphone 10 corresponding to the other channel (for example, the right channel (R-ch)) is sampled by the A / D converter 22 and converted into digital data. Each digital data from the A / D converters 21 and 22 is stored as R-ch and L-ch data of stereo audio waveform data in a predetermined area of the system RAM 3 via the corresponding buffer 24 or 25, respectively. Is done. Note that the frequency of the sampling clock of the A / D converter 21 and the A / D converter 22 at this time may be a frequency different from the sampling frequency during the call.
The stereo audio waveform data thus captured is used as a material for creating new timbre data, or as long-stream waveform data after being processed as necessary, as will be described later. It will be.
[0010]
FIG. 3 is a block diagram showing an example of the internal configuration of the music playback unit 12. A music file can be reproduced in stereo using the music reproduction unit 12 to be a ringing melody or a hold sound. It is also possible to listen to music by playing music files in stereo during non-calling.
In FIG. 3, reference numeral 41 denotes an interface unit connected to the bus 16, 42 denotes an FM sound source (polyphonic FM sound source) capable of generating a plurality of channels of musical sounds, and 43 denotes a plurality of channels of musical sounds. Waveform memory type sound source (polyphonic WT sound source), 44 is a timbre ROM that stores timbre data of preset timbres preset in the portable communication device, and 45 is a timbre data of timbres other than preset timbres. This is a tone color RAM that can be used. Here, the WT sound source 43 may be either a PCM system or an ADPCM system. The timbre ROM 44 stores, for example, GM128 tone color data and drum set tone data as preset tone color data.
The FM sound source 42 and the WT sound source 43 generate musical tone waveform data of a timbre designated by a plurality of tone generation channels based on the timbre data stored in the timbre ROM 44 or the timbre RAM 45.
[0011]
The timbre data is unique to each timbre, and includes waveform parameters and other data. The waveform parameter indicates a musical sound waveform. In the case of an FM sound source, the parameter indicates an FM calculation algorithm. In the case of a WT sound source, the tone color waveform data, the start address of the tone color waveform data, the loop start address, For example, an end address. Other data includes envelope parameters that specify attack rate, decay rate, sustain level, release rate, etc., modulation parameters that specify the depth and speed of vibrato and tremolo, effects such as reverb, chorus, and variation. And an identifier indicating whether the tone color is an R channel, an L channel, or a monaural tone color of a stereo tone color.
[0012]
Further, 46 is an L channel mixer that mixes L channel musical sound waveform data among the musical sound waveform data generated by the FM sound source 42 or the WT sound source 43, and the output of the L channel mixer 46 is D / A converted. After being converted to an analog signal by the device 47, it is supplied to the headphone 14 as an L channel output, input to the audio processing unit 8, supplied to the adder 31, and released from the receiving speaker 11 as described above. It will be sounded.
Reference numeral 48 denotes an R channel mixer that mixes R channel musical sound waveform data among the musical sound waveform data generated by the FM sound source 42 or the WT sound source 43, and the output of the R channel mixer 48 is D / A converted. After being converted to an analog signal by the device 49, it is supplied to the headphone 14 as an R channel output and emitted from the speaker 13.
Thus, in this embodiment, the music can be reproduced in stereo using the headphones 14 or the reception speaker 12 and the speaker 13.
[0013]
In the present invention, as described above, the input sound is stereo-sampled using the two microphones 9 and 10. By using the stereo-sampled waveform data in this way as the timbre waveform data of the WT sound source, it is possible to reproduce or generate a musical sound waveform that naturally has a sense of localization and a sense of spread. The tone data created using the R channel and L channel waveform data recorded at the same time as the material includes the same tone name (timbre number) and an identifier (R) identifying whether it is the R channel or the L channel. , L). When using this stereo tone data when playing a musical piece, the tone sound data of the R channel and the L channel having the tone name is used, and the tone is generated using the two tone generation channels of the sound source. It becomes.
In the above description, the transmission microphone 9 is also used for inputting one stereo channel (for example, L channel), but a dedicated microphone may be provided separately. However, the cost can be reduced by using the transmission microphone 9 in common.
[0014]
FIG. 4 is a diagram showing a file format of music data that can be reproduced in the communication terminal of the present invention. As shown in this figure, in the communication terminal of the present invention, three types of music files can be played: (1) a simple sequence file, (2) a sequence file with timbre data, and (3) a stream file. it can.
As described above, these music files are stored in advance in the system ROM 2 as preset melodies or stored in a music file storage area in the system RAM 3. For example, a music file downloaded from a distribution server, a music file read from an external device via the external interface circuit 15, a new music file created using the operation unit 6, or an existing music file is operated. The music file changed or edited using the unit 6 can be stored in a music file storage area in the system RAM 3.
[0015]
(1) The simple sequence file is composed of a header part and a sequence data part. The header part contains information such as the number of tracks contained in this music file and the time base during playback of this music, and the sequence data part contains event information (MIDI events) and the time interval between each event. A set of information (duration data, delta time) to be expressed is included in the order of event occurrence. Also, the song title, comment information, instrument name, lyrics information, etc. of this song can be included. As this simple sequence file, for example, there is a music file in the SMF format.
[0016]
(2) The sequence file with timbre data includes a header portion, a timbre data portion and a sequence data portion as shown in the figure. The timbre data portion includes timbre data used for reproduction of the music and timbre assignment information for designating the timbre to be assigned to each part. The sequence data part is the same as that of the simple sequence file. As the sequence file with tone color data, for example, there is a music file in the SMAF format.
[0017]
(3) Long stream data includes a header part, a long stream data part, and a sequence data part. Here, the long stream data is waveform data sampled for a long time and has a large size. The sequence data section only includes a set of events and duration data relating to the start, end, pitch shift, effect, etc. of the reproduction, which is much higher than in the cases (1) and (2). It is simple data. An example of the long stream file is a SMAF format music file.
[0018]
The following describes how these three music files are played back. In the present embodiment, the system CPU 1 operates as a sequencer, interprets sequence data contained in a music file to be played, and controls the FM sound source 42 or the WT sound source 43 at a timing defined by the sequence data. Although the data is supplied, the sequencer function may be provided by the music playback unit 12, or the system CPU 1 and the music playback unit 12 may cooperate to implement the sequencer function. Since reproduction using stereo-sampled waveform data, which is a characteristic part of the present invention, uses the WT sound source 43, the following description will be made assuming that the WT sound source 43 is used as a sound source.
[0019]
FIG. 5 is a diagram showing how the (1) simple sequence file is reproduced. In this case, playback using a preset tone color is usually performed.
As shown in the figure, sequence data of a simple sequence file (for example, SMF data) selected to be reproduced is sequentially read from the system RAM 3 by the system CPU 1 operating as the sequencer. As described above, the sequence data includes a set of duration data and event data representing the time interval between each event, and the system CPU 1 responds to the event at the timing specified by the duration data. The sound source control data is output to the WT sound source 43.
[0020]
For example, when the read event is a program change message, based on the MIDI channel number and program number (tone number) included in the message, the tone color ROM 44 (or the tone color data of the tone color assigned to the MIDI channel and that channel) (or The address of the timbre data corresponding to the MIDI channel is set in the timbre table storing the correspondence with the address in the timbre RAM 45).
If the read event is a note-on message, the tone generation channel of the WT sound source 43 is assigned to the MIDI channel included in the message, and the tone color ROM 44 (or tone color RAM 45) is referred to the tone color table. The corresponding timbre data is read, the start address of the timbre waveform data is sent to the address generator 52, the end address and loop start address are sent to the phase generator 51, the envelope data is sent to the envelope generator 54, and the effect data is not shown. Set each effector. When the timbre corresponding to the MIDI channel is a stereo timbre, different tone generation channels are assigned to the timbre of the R channel and the timbre of the L channel.
[0021]
The timbre waveform data is read out from the timbre ROM 44 (or timbre RAM 45) at the read address output from the address generator 52 via the memory interface circuit 53. This read address is updated with the phase increment value (F number) converted from the note number included in the note-on message by the output of the phase generator 51, and after reaching the end address, the loop start is performed. It is controlled to set the address as an initial value.
Thereby, a musical tone waveform sample corresponding to the note number can be read out, and the read musical tone waveform sample data is multiplied by the envelope data from the envelope generator 54 in the multiplier 55, and further, if necessary. In response, an effect is applied by an effector (not shown) and input to the L-ch mixer 46 or the R-ch mixer 48 shown in FIG.
[0022]
Next, the reproduction of the sequence file with tone color data (2) will be described with reference to FIG.
As described above, in this case, the timbre assignment information for designating the timbre data and the timbre to be assigned to the part is included in the sequence file. The timbre RAM 45 is written through the circuit 53. When a plurality of tone color data are included, the plurality of tone color data are written in the tone color RAM 45. In the case of a stereo tone color, the R channel tone color data and the L channel tone color data are respectively written in the tone color RAM. Also, based on the timbre assignment information, an address in the timbre RAM 45 of the part and the corresponding timbre data is set in the timbre table. In the case of a stereo tone color, the address of tone color waveform data for each of the R channel and the L channel is set.
[0023]
Then, the sequence data included in this sequence file is reproduced. This process is performed in the same manner as the above (1) simple sequence file reproduction process. That is, after assigning the sound generation channel of the WT sound source based on the note-on message, the timbre data corresponding to the part is read out, set in each part of the sound source, and reading out the timbre waveform data is started. In the case of a program change message, the timbre table is rewritten. In the case of a stereo tone, the R-channel and L-channel tone waveform data are read out respectively, the R-channel musical sound waveform data are sent to the R-ch mixer 48, and the L-channel musical sound waveform data are called the L-ch. It is input to the mixer 46.
[0024]
Next, (3) reproduction of a stream file will be described with reference to FIG. (A) of FIG. 7 is a diagram showing how a stream file is reproduced, and (b) is a diagram for explaining how long stream data is reproduced using the timbre RAM 45.
As described above, (3) a stream file includes long stream data having a large size and sequence data including events that indicate the start, end, pitch shift, and effect of the reproduction of the long stream data.
[0025]
Prior to playback of the stream file, the system CPU 1 first assigns the head portion of the long stream data to an area allocated for the sound generation of the long stream data in the timbre RAM 45 (the start address of this area is As, end The address is set to Ae) through the memory interface circuit 53. In the case of long stream data sampled in stereo, different areas are assigned to the R channel and the L channel, respectively, and read out in synchronization.
Then, processing corresponding to each message is performed according to the sequence data. For example, when a pitch bend message instructing a change in pitch is included, the parameters included in the message are supplied to the phase generator 51. When the note-on message is read, reading of the long stream data from the timbre RAM 45 is started. That is, the read pointer Pr of the address generator 52 is set to the start address As, and reading of long stream data is started while updating the read pointer based on the phase data from the phase generator 51. The read long stream waveform data is output via the memory interface circuit 53 and the multiplier 55.
[0026]
When reading of the long stream data from the timbre RAM 45 proceeds and the value of the read pointer Pr of the timbre RAM 45 exceeds the center position (address Ac) of the area allocated for the sound generation of the long stream data (Pr) > Ac), the address generator 52 detects this and notifies the system CPU 1 by, for example, generating an interrupt. As described above, the address generator 52 has a mechanism for detecting when the read address of the waveform memory reaches the end address and reading from the loop address, and using this mechanism, Pr> Ac Can be detected.
In response to this interrupt, the system CPU 1 starts writing the long stream data that follows the start address As. That is, using the write pointer Pw as the start address As, the subsequent long stream data is written in the area (buffer area 1) up to the central address Ac. This writing is performed in parallel with the reading of the long stream data.
[0027]
When the reading of the long stream data further proceeds and the value of the read pointer Pr reaches the end address Ae, the address generator 52 sets the value of the read pointer Pr to the start address As and follows. Read stream data. At this time, the address generator 52 notifies the system CPU 1 that the read address has reached the end address in the same manner as described above. As a result, the system CPU 1 writes subsequent data into the buffer area 2 of the address Ac to the end address Ae.
In the same manner, long stream data can be reproduced using the timbre RAM 45 by similarly dividing the area of the timbre RAM 45 into two and writing the long stream data alternately and sequentially reading them.
Here, the address of the central part of the area where the timbre data is stored is set as the interrupt point. However, the present invention is not limited to this. For example, the number of reproduced samples is counted, and a predetermined amount of samples is set. May be started, an interrupt for transferring the subsequent sample may be started.
[0028]
In the communication terminal of the present invention configured as described above, a process for reproducing music using the waveform data sampled using the audio processing unit 8 will be described with reference to the flowchart of FIG. That is, since the music file that can be played back in the mobile communication terminal of the present embodiment is the above-mentioned three kinds of music files, in order to use the voice waveform data stereo-sampled by the voice processing unit 8 for playback, Perform the following process.
[0029]
First, the audio data is sampled using the audio processing unit 8 as described above (step S1). At this time, it is possible to select either stereo sampling using both the microphones 9 and 10 or monaural sampling using either one of the microphones. Here, stereo sampling is selected. Has been. The stereo sampled audio data is stored in the system RAM 3 as described above.
Next, timbre data is created using the stereo sampled waveform data as a material, and when the timbre data is used, the process proceeds to step S2, and long stream reproduction is performed for reproducing the stereo sampled waveform data for a long time. If so, the process proceeds to step S6.
[0030]
First, a case where tone color data created using stereo-sampled waveform data as a material is used for reproduction of a music file will be described. In this case, in step S2, a process for creating timbre waveform data using the stereo-sampled audio data as a material is performed, and an identification number for identifying the timbre is attached to the created timbre waveform data. Register as That is, with respect to the audio data stereo-sampled by the audio processing unit 8, the variation of the envelope and pitch is displayed on the display unit 4, and the portion of the displayed audio data used as timbre waveform data is cut out In addition, a loop start point and end point setting process that is the start and end positions of a loop when sounding for a long time, a process of giving a desired envelope, and the like are performed. At this time, the waveform data of both the left and right channels sampled in stereo are displayed on the display unit 4 at the same time, and the cut-out process and the loop start point and end point setting processes are performed in common for the waveform data of both the left and right channels.
Then, the same timbre number is attached to the stereo audio data cut out after such processing and stored as timbre data in the timbre data storage area in the system RAM 3. At this time, identifiers (R, L) indicating whether the timbre is left or right of the stereo are added.
[0031]
Next, proceeding to step S3, the sequence data of the music to be reproduced is obtained using the tone color data registered by stereo sampling in step S2. This sequence data is the sequence data included in the above-mentioned (1) simple sequence file or (2) sequence file with timbre data, and is selected from the music files stored in the music file storage area of the system RAM 3. Or downloaded from an external distribution server or input from an external device via the interface circuit 15.
[0032]
When (1) a simple sequence file (for example, an SMF file) is obtained, the process proceeds to step S4, and the sequence data included in the simple sequence file is used for the tone data newly registered by the stereo sampling. Change to That is, the program change message included in the sequence data is changed so as to specify the tone number of the newly registered tone color data, a new simple sequence file is created, and the music file storage area in the system RAM 3 is created. Remember. By reproducing this simple sequence file as described above, it is possible to reproduce music using the tone color data newly registered by stereo sampling.
[0033]
On the other hand, when (2) the sequence file with timbre data is obtained, the process proceeds to step S5. Here, the timbre data of the obtained sequence file with timbre data is changed to the newly registered timbre data, and new sequence data with timbre data is created and stored in the system RAM 3. That is, the timbre data part of the obtained sequence file with timbre data is replaced with the timbre data created and registered in step S2, and the timbre assignment information is edited to use the timbre data number, and new timbre data is added. Sequence data is created and stored in the music file area in the system RAM 3. By reproducing the sequence data with timbre data as described above, it is possible to reproduce the music using the timbre data newly registered by stereo sampling.
[0034]
When creating a stream file, the process proceeds to step S6 after step S1, and (3) the stream file is created. That is, long stream data is created by cutting out a portion to be long stream data from the audio data stereo-sampled in step S1, or by performing processing such as adding an envelope and adjusting the level. Then, sequence data is created by creating a message for adding the start and end of playback, pitch shift, or an effect, and information indicating the time interval. Next, the created long stream data and sequence data are combined, a header is added, a stream file is created, and stored in the system RAM 3. By reproducing the stream file as described above, it is possible to reproduce the audio data stream that is stereo-sampled by the portable communication terminal.
[0035]
As described above, according to the present invention, by using stereo-sampled audio waveform data in the waveform memory of the WT sound source, it is possible to reproduce a ringing melody or hold tone that has a sense of breadth and is unique. It becomes.
For example, when using timbre data created using stereo-sampled audio waveform data as a material, by assigning the timbre data to a plurality of sound generation channels, a plurality of sounds can be reproduced simultaneously. Various contents such as gospel chorus by voice can be produced.
[0036]
In the above, a music file for playing back stereo-sampled audio data was created in the mobile communication terminal. However, a music file that uses the stereo-sampled audio data is created outside the mobile communication terminal. It may be.
For example, the audio data stereo-sampled by the mobile communication terminal is transmitted to a server provided on the network, and the process of creating or converting the music file shown in FIG. The file may be sent back to the mobile communication terminal. Alternatively, stereo-sampled audio data is transmitted to an external device such as a personal computer connected via the external interface circuit 15 of the mobile communication terminal, and the external device performs conversion or creation processing of the music file. Alternatively, the created music file may be returned to the mobile communication terminal.
In the above description, the portable communication terminal has been described as an example. However, the present invention can be applied in the same manner to a fixed communication terminal.
[0037]
【The invention's effect】
As described above, according to the communication terminal of the present invention, it is possible to process and reproduce stereo-sampled sound, and it is possible to reproduce a unique musical sound while having a sense of breadth.
Moreover, both the generation of a ringing melody based on a sequence data file and the generation of a ringing melody based on stereo-sampled voice can be realized at low cost by sharing hardware.
Furthermore, according to the present invention, stereo-sampled audio can be used as timbre material that can be specified from sequence data. Even when existing sequence data is used, the original timbre is reproduced. It becomes possible.
Furthermore, when used in combination with the multi-channel simultaneous sound generation mechanism of the waveform memory sound source, it is possible to superimpose and reproduce a plurality of stereo-sampled sounds at different locations and times. It is possible to play a simple music.
Furthermore, when used in combination with the multi-channel simultaneous sound generation mechanism of the waveform memory sound source, it is possible to generate chords using one stereo sampled sound, and for example, gospel chorus-like reproduction is possible.
As described above, according to the present invention, it is possible to provide a communication terminal capable of creating various contents and reproducing an incoming melody rich in individuality and highly distinguishable from others.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of a mobile communication terminal which is an embodiment of a communication terminal of the present invention.
2 is a block diagram showing a configuration example of an audio processing unit in the mobile communication terminal shown in FIG.
3 is a block diagram showing a configuration example of a music playback unit in the mobile communication terminal shown in FIG. 1;
FIG. 4 is a diagram for explaining the configuration of a music file.
FIG. 5 is a diagram for explaining how a simple sequence file is reproduced.
FIG. 6 is a diagram for explaining how a sequence file with timbre data is reproduced.
7A and 7B are diagrams for explaining the reproduction of a stream file, where FIG. 7A is a diagram showing how the stream file is reproduced, and FIG. 7B is a diagram showing how long stream data is reproduced using the timbre RAM 45. It is a figure for doing.
FIG. 8 is a diagram for explaining the flow of a music file creation process using sampled audio data.
[Explanation of symbols]
1 system CPU, 2 system ROM, 3 system RAM, 8 audio processing unit (audio CODEC), 9,10 microphone, 11,13 speaker, 12 music reproducing unit, 14 headphones, 21,22 A / D converter, 23, 24, 25, 29, 30 Buffer, 28 D / A converter, 42 FM sound source, 43 Waveform memory sound source (WT sound source), 44 tone ROM, 45 tone RAM, 46 L-ch mixer, 47, 49 D / A conversion , 48 R-ch mixer, 51 phase generator, 52 address generator, 53 memory interface circuit, 54 envelope generator, 55 multiplier

Claims (4)

A communication terminal having a control unit, a storage unit, a communication unit, a voice processing unit, a display unit, an operation unit, and a music playback unit,
The music playback unit includes a storage means for storing waveform data, an address generator for generating an address signal that changes at a rate corresponding to a specified note number, and the storage by the address signal generated from the address generator. An envelope applying unit for applying an envelope to the waveform data read from the means ,
The audio processing unit has a function of stereo-sampling an audio signal input via two microphones,
The control unit is configured to generate stereo musical sounds using the stereo sampled audio waveform data from the music playback unit by storing the stereo sampled audio waveform data in the storage unit. A communication terminal.   The communication terminal according to claim 1, wherein one of the two microphones is a transmission microphone. The address generator generates an address signal that repeatedly reads from a predetermined start address to an end address,
Wherein, by writing by sequentially supplying the waveform data of a long stream of a material speech waveform data the stereo sampled already read address area in the memory means, a long stream from the musical piece reproducing unit 3. The communication terminal according to claim 1, wherein the communication terminal is configured to be able to reproduce stereo waveform data.   3. The communication according to claim 1, further comprising means for creating stereo timbre data using the stereo sampled audio waveform data as a material, and reproducing the music using the created stereo timbre data. Terminal.

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