JP5488977B2 - Musical sound generator and program - Google Patents

Description

  The present invention relates to a musical sound generating apparatus and program for controlling a reproduction mode of a digital audio signal or changing a musical sound modification mode in accordance with a digital audio signal transported from the outside.

  A technique for receiving a digital audio signal and rewriting internal data of the device itself is known. For example, Patent Document 1 discloses a reproduction process in which a bit clock and a word clock are extracted from a digital audio signal supplied to an SPDIF input terminal, and stored in a memory based on upgrade data generated from the extracted bit clock and word clock An apparatus for updating a reproduction processing function by updating a program and coefficient data for use is disclosed.

JP2002-149428

  By the way, the technique disclosed in Patent Document 1 simply receives the upgrade data transferred by the digital audio signal and updates the device function. Therefore, according to the digital audio signal transported from the outside, the digital There is a problem that it is impossible to control the reproduction mode of the audio signal and change the musical sound modification mode.

  The present invention has been made in view of such circumstances, and controls the reproduction mode of the digital audio signal or changes the tone modification mode according to the digital audio signal transported from the outside. An object of the present invention is to provide a musical sound generating apparatus and program capable of performing the above.

  In order to achieve the above object, according to the first aspect of the present invention, in a musical sound generator having a sound source composed of various modules for modifying a musical sound, a transfer signal encoded by the biphase mark method is received and decoded. Receiving means, a transfer mode determining means for determining whether or not the receiving means is in a normal mode synchronized with a transfer signal at a normal transfer rate, and when the transfer mode determining means determines the normal mode, An input means for inputting received data decoded and output from the receiving means to a sound source designating module; and a transfer rate different from the normal transfer rate when the transfer mode determining means determines that the mode is not normal mode. Mode transition means for transitioning to a control mode that is synchronized with the transfer signal, and the mode transition means. Parameter updating means for interpreting and executing a control command included in reception data decoded and output from the receiving means that has transitioned to a mode, and updating a parameter for specifying a tone modification mode of a sound source designation module; To do.

  In the invention according to claim 2, which is dependent on claim 1, the receiving means generates a lock output when synchronized with an SPDIF signal having a normal transfer rate corresponding to a sampling rate of general PCM audio data. An output generation unit is provided, wherein the transfer mode determination unit determines whether or not the normal mode is set based on whether or not a lock output is generated.

  In the invention according to claim 3, which is dependent on claim 1, the mode transition means changes the reception setting of the reception means until it synchronizes with an SPDIF signal having a transfer rate different from the normal transfer rate. It is characterized by comprising.

  In the invention according to claim 4, which is dependent on claim 1, the parameter update means is a control command in which received data decoded and output from the receiving means synchronized in a control mode includes a parameter for specifying a musical tone modification mode. It is characterized by comprising discrimination means for discriminating whether or not there is.

  According to the fifth aspect of the present invention, there is provided a program to be executed by a musical sound generator having a sound source composed of various modules for modifying a musical sound, receiving a transfer signal encoded by the biphase mark method, and performing decoding output A transfer mode determining step for determining whether or not the receiving unit is in a normal mode synchronized with a transfer signal at a normal transfer rate, and when the normal mode is determined by the transfer mode determining step, a decoding output from the receiving unit When the received data is input to the sound source designation module and the transfer mode determining step determines that the received mode is not the normal mode, the receiving unit is synchronized with a transfer signal having a transfer rate different from the normal transfer rate. A mode transition step for transition to the control mode, and transition to the control mode at the mode transition step. Characterized in that to execute a parameter updating step of running interprets a control command contained in the received data to be decoded output to update a parameter which specifies the tone modification aspects of the specification module of the sound source to the computer from the reception unit.

  In the present invention, according to a digital audio signal transported from the outside, the reproduction mode of the digital audio signal can be controlled, or the musical sound modification mode can be changed.

It is a block diagram which shows the whole structure of the musical tone generator 100 by one Embodiment. 4 is a diagram illustrating a format of an SPDIF signal input to an SPDIF receiving unit 16. FIG. 3 is a block diagram showing a configuration of an SPDIF receiving unit 16. FIG. 3 is a block diagram showing a configuration of a sound source 17. FIG. It is a flowchart which shows the operation | movement of the SPDIF input process which CPU10 performs. It is a figure for demonstrating operation | movement of a SPDIF input process. It is a block diagram which shows the structure of other embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A. Configuration (1) Overall configuration
FIG. 1 is a block diagram showing the overall configuration of a musical sound generating apparatus 100 according to an embodiment of the present invention. In this figure, the CPU 10 controls each part of the apparatus according to a switch event generated by the operation unit 14 and an event generated by the SPDIF receiving unit 16. The characteristic processing operation of the CPU 10 according to the gist of the present invention will be described in detail later. The ROM 11 stores various program data loaded into the CPU 10. The various programs referred to here include SPDIF input processing described later.

  The RAM 12 temporarily stores various register / flag data used for processing of the CPU 10. The keyboard 13 generates performance information such as a key-on / key-off signal, a key number, and velocity according to a performance operation (press / release key operation). The operation unit 14 has various operation switches arranged on the apparatus panel, and generates a switch event corresponding to the operated switch type.

  The display unit 15 displays the operation state and setting state of the apparatus on the screen in accordance with the display control signal supplied from the CPU 10. The SPDIF receiver 16 receives and demodulates the SPDIF signal (digital audio signal) transported from the outside, and outputs it to the CPU 10 and the sound source 17. The CPU 10 determines the “normal mode” when the SPDIF receiver 16 synchronizes with an SPDIF signal having a normal transfer rate corresponding to a general PCM audio data sampling rate (for example, 44.1 kHz or 48 kHz). On the other hand, the control mode is determined when synchronized with an SPDIF signal having a transfer rate different from the normal transfer rate.

  The sound source 17 is configured by a well-known waveform memory reading method, and includes a plurality of sound generation channels that perform time-division operation. In the sound source 17, the operation mode is changed according to the mode (the above-described “normal mode” or “control mode”) determined by the CPU 10. That is, when the CPU 10 determines that the “normal mode” is selected, the PCM audio data decoded and output from the SPDIF receiving unit 16 is subjected to user-specified tone control (tone control, volume control, and effect addition), and the next-stage sound. Output to system 18.

  On the other hand, when the CPU 10 determines “control mode”, the parameter of a predetermined module (described later) constituting the sound source 17 is updated based on a control command (described later) decoded and output from the SPDIF receiver 16. Change the tone modification mode. The sound system 18 performs filtering such as removing unnecessary noise from the analog output signal obtained by D / A converting the output of the sound source 17, and then amplifies the signal to generate sound from the speaker.

(2) Signal Format of SPDIF Signal Next, the signal format of the SPDIF signal input to the SPDIF receiver 16 will be described with reference to FIG. FIG. 2 is a diagram illustrating an example of an SPDIF format for transporting 2ch stereo data. The SPDIF signal is divided into block units, and one block is composed of 192 frames.

  One frame period corresponds to a sampling period (1 / fs) of data to be transferred. One frame is composed of two subframes (Lch subframe and Rch subframe). One subframe has a 32-bit width of 0SB to 31SB. Among them, a 0-bit to 3SB includes a 4-bit synchronization code Sync Code called a preamble, and an audio sample Audio Sample with a maximum length of 24 bits of 4SB to 27SB. And a 4-bit control signal of 28SB to 31SB. The transfer data of 4SB to 31SB, excluding the synchronization code Sync Code (preamble) in the subframe, is encoded (BMC encoded) by the biphase mark method in which 1 bit is represented by 2 bits.

  The synchronization code Sync Code in the first subframe in frame # 0 is “B” corresponding to the start bit, the synchronization code Sync Code in the next subframe is “W”, and the synchronization code Sync in the first subframe in the next frame # 1 The code is “M”, and thereafter “W” and “M” are alternately repeated until the frame # 191 is reached.

  The audio sample Audio Sample is usually 20-bit data per sample. However, if 4-bit spare AUX is used, even 24-bit data can be handled. As will be described later, when transferring a 16-bit control command (described later), as shown in the figure, 4SB to 11SB of 4SB to 27SB audio samples are all set to “0”, and the rest 16SB control commands set to the right are set to 12SB to 27SB.

  The 4-bit control signal is composed of the 28SB validity V, the 29SB user data U, the 30SB channel status C, and the 31SB even parity P. The validity V is a bit indicating validity / invalidity of the audio sample Audio Sample, and is “0 (L)” if valid, and “1 (H)” if invalid. The user data U is user-defined information, and is used, for example, to represent time information such as an elapsed time from the beginning at the time of CD recording or an elapsed time in a song with 192 bits in one block.

  The channel status C is used to indicate an audio sample Audio Sample or an attribute relating to a frame (for example, information indicating a sampling period or copyright). In the even parity P, the parity check value of the transfer data from 4SB to 31SB excluding the synchronization code Sync Code (preamble) in the subframe is set.

(3) Configuration of SPDIF Receiver 16 Next, the configuration of the SPDIF receiver 16 will be described with reference to FIG. The SPDIF receiving unit 16 includes a synchronization unit 20, a change point detection unit 21, a strobe signal generation unit 22, a strobe count value setting unit 23, a data capture unit 24, an input state determination unit 25, a preamble detection unit 26, a rate setting unit 27, Preamble cycle count value setting unit 28, preamble detection cycle determination unit 29, lock output 1 generation unit 30, decoder unit 31, C / P / U / V processing unit 32, channel status Fs comparison value setting unit 33, parity check unit 34 , A status check unit 35 and a lock output 2 generation unit 36.

  The synchronization unit 20 synchronizes the SPDIF signal transported from the outside with the internal clock CLK on the reception side. The change point detector 21 generates a detection signal when a change point (frame or subframe) of the SPDIF signal synchronized with the internal clock CLK on the receiving side is detected. The strobe signal generation unit 22 compares the time counter value that starts timing from the time when the change point detection unit 21 generates the detection signal and the strobe counter value generated by the strobe counter value setting unit 23, and the time counter value is When it matches the counter value, a strobe signal is generated and output to the data fetch unit 24. The strobe counter value setting unit 23 generates a strobe counter value in accordance with an instruction from the rate setting unit 27.

  The data capture unit 24 shifts and outputs the output of the synchronization unit 20 captured in the shift register every time the strobe signal is supplied from the strobe signal generation unit 22. The input state determination unit 25 supplies the rate setting unit 27 and the CPU 10 with the result of determining whether or not the SPDIF signal is input based on the detection signal output from the change point detection unit 21. The preamble detection unit 26 detects a synchronization code Sync Code (preamble) of “B” indicating a start based on a comparison between the data shifted from the data acquisition unit 24 in the previous stage and the preamble pattern. When a synchronization code Sync Code (preamble) of “B” indicating start is detected, a preamble detection signal is generated and output to the preamble detection period determination unit 29.

  When the input state determination unit 25 determines that there is a signal input, the rate setting unit 27 generates a strobe count value, a preamble cycle count value, and a channel status Fs comparison value under the control of the CPU 10, respectively. The setting unit 23, preamble cycle count value setting unit 28, and channel status Fs comparison value setting unit 33 are instructed. The preamble cycle count value setting unit 28 generates a preamble cycle count value in accordance with an instruction from the rate setting unit 27.

  The preamble detection cycle determination unit 29 detects the preamble cycle every time the preamble detection signal is supplied from the preamble detection unit 26, and the detected preamble cycle matches the preamble cycle count value supplied from the preamble cycle count value setting unit 28. Judge whether to do. When the detected preamble cycle matches the preamble cycle count value, the lock output 1 generator 30 is instructed to output the lock output 1 signal. On the other hand, if the detected preamble cycle does not match the preamble cycle count value, the lock output 1 generator 30 is instructed to reset. The lock output 1 generator 30 stops outputting the lock output 1 signal in response to the reset instruction.

  The decoder unit 31 decodes and outputs the BMC-encoded audio sample Audio Sample and the 4-bit control signal (validity V, user data U, channel status C, and even parity P). The decoded audio sample Audio Sample is supplied to the CPU 10 and the sound source 17, while the decoded validity V, user data U, channel status C, and even parity P are supplied to the C / P / U / V processing unit 32. Is done.

  The C / P / U / V processing unit 32 instructs the CPU 10 to invalidate the audio sample Audio Sample when the validity V is “1 (H)”. In addition, the C / P / U / V processing unit 32 extracts time information such as the elapsed time in the music based on the user data U. Further, the C / P / U / V processing unit 32 outputs the even parity P to the parity check unit 34 and outputs the channel status C to the status check unit 35.

  The channel status Fs comparison value setting unit 33 generates a channel status Fs comparison value in accordance with an instruction from the rate setting unit 27. The parity check unit 34 performs a parity check based on the even parity P supplied from the C / P / U / V processing unit 32, and instructs the lock output 2 generation unit 36 to reset if there is a parity error. The lock output 2 generator 30 stops outputting the lock output 2 signal in response to the reset instruction.

  The status check unit 35 extracts the sampling period of the audio sample Audio Sample from the status information represented by the channel status C for a predetermined frame. Further, the status check unit 35 compares the extracted sampling period with the channel status Fs comparison value supplied from the channel status Fs comparison value setting unit 33, and if they match, the lock output 2 is output to the lock output 2 generation unit 36. On the other hand, if the signal does not match, the lock output 2 generator 36 is instructed to reset.

(4) Configuration of Sound Source 17 Next, the configuration of the sound source 17 will be described with reference to FIG. The sound source 17 is composed of a known DSP. Therefore, FIG. 4 illustrates functional blocks in which each function of the microprogram executed in the DSP is regarded as a hardware image. In FIG. 4, a waveform generator 50 is configured by a well-known waveform memory reading method for storing waveform data of various timbres, and the waveform data of a specified tone color is specified to a specified pitch according to a musical tone parameter generated by the CPU 10 according to performance information. Read with.

  The filter unit 51 is composed of a well-known DCF (digital control filter), and changes the low-pass characteristics by changing the cutoff frequency of the DCF, for example, according to the parameter (filter coefficient) supplied via the demultiplexer 55. Thus, the tone of the waveform data output from the waveform generator 50 is controlled.

  The envelope generation unit 52 generates an envelope waveform for volume control according to the parameter (ADSR type envelope level / rate) supplied via the demultiplexer 55 and multiplies the waveform data input from the filter unit 51 by the waveform data. And output. The above components 50 to 52 are configurations corresponding to one tone generation channel, and simultaneous tone generation (polyphonic tone generation) from a plurality of tone generation channels is realized by operating the configuration in a time-sharing manner.

  The mixer unit 53 outputs musical tone data obtained by mixing the waveform data for each tone generation channel output from the envelope generation unit 52 according to the parameters (mixing ratio) supplied via the demultiplexer 55. The effect applying unit 54 generates a musical sound output in which the effect of the type specified by the parameter (effect type) supplied via the demultiplexer 55 is applied to the output of the mixer unit 53.

  The demultiplexer 55 inputs the reception data decoded and output by the SPDIF receiver 16 to any one of the above-described components 51 to 54 in accordance with a user operation for designating an input destination or an instruction from the CPU 10. Specifically, the SPDIF receiver 16 synchronizes with a SPDIF signal having a normal transfer rate corresponding to a general PCM audio data sampling rate (for example, 44.1 kHz, 48 kHz, etc.). If it is determined, the demultiplexer 55 performs a user operation (switch operation) for designating an input destination among the modules of the sound source 17 (the filter unit 51, the envelope generating unit 52, the mixer unit 53, and the effect applying unit 35). The received data (audio sample Audio Sample) is input to the module specified by.

  On the other hand, when the SPDIF receiver 16 synchronizes with an SPDIF signal having a transfer rate different from the normal transfer rate, and the CPU 10 determines that the control mode is “control mode”, the CPU 10 interprets the control command transferred as received data. The demultiplexer 55 supplies the parameters included in the control command to the designated module. That is, as described above, if the designated module is the filter unit 51, the filter coefficient is selected. If the envelope generating unit 52 is used, the ADSR type envelope level / rate is selected. If the mixer unit 53 is used, the mixing ratio is selected. Supply each.

B. Operation Next, the operation of the musical tone generator 100 having the above-described configuration will be described with reference to FIGS. In the musical sound generating device 100, the CPU 10 executes the SPDIF input process shown in FIG. 5 at predetermined intervals by a timer interrupt. When it is time to execute the SPDIF input process, the CPU 10 advances the process to step S1 to determine whether the SPDIF receiver 16 is synchronized in the normal mode. Whether or not synchronization is performed in the normal mode is determined by the presence or absence of the lock outputs 1 and 2 described above.

  When synchronized in the normal mode, the determination result in step S1 is “YES”, and the process proceeds to step S2. In step S2, according to the user operation (switch operation) for designating the input destination, the SPDIF receiving unit 16 is assigned to the designated module (one of the filter unit 51, the envelope generating unit 52, the mixer unit 53, and the effect applying unit 35) in the sound source 17. Gives a path instruction to the demultiplexer 55 so as to input the audio sample Audio Sample to be decoded and output, and this processing is completed.

  For example, when the user instructs input to the filter unit 51, the sound source 17 performs tone color control, volume control, and effect addition on the audio sample Audio Sample (PCM audio data) decoded and output by the SPDIF receiving unit 16. Can be played back. That is, according to the digital audio signal transported from the outside, it is possible to control the reproduction mode of the digital audio signal.

  On the other hand, if the SPDIF receiver 16 is not synchronized in the normal mode, the determination result in step S1 is “NO”, and the process proceeds to step S3 to determine whether or not the control mode is valid. That is, it is determined whether or not the input state determination unit 25 (see FIG. 3) of the SPDIF reception unit 16 determines that there is a signal input. If there is no signal input, the control mode is invalidated, so the determination result is “NO”, and the present process is terminated.

  On the other hand, if there is a signal input, the determination result in step S3 is “YES”, and the process proceeds to step S4. In step S4, the strobe count value set in the strobe count value setting unit 23 via the rate setting unit 27 (see FIG. 3), the preamble cycle count value set in the preamble cycle count value setting unit 28, and the channel status Fs comparison are performed. The reception setting is changed to change the channel status Fs comparison value set in the value setting unit 33.

  Subsequently, in step S5, it is determined whether or not the SPDIF receiver 16 is synchronized in the control mode in response to the reception setting change performed in step S4. If the control mode is not synchronized, the determination result is “NO”, the process returns to step S4, and the reception setting change for changing the strobe count value, preamble cycle count value, and channel status Fs comparison value is repeated. When the SPDIF receiving unit 16 synchronizes with the SPDIF signal having a transfer rate different from the normal transfer rate in accordance with the repetition of the reception setting change, the determination result in Step S5 is “YES”, and the process proceeds to Step S6.

  In step S6, it is determined whether or not the received data decoded and output from the SPDIF receiver 16 synchronized with the SPDIF signal having a transfer rate different from the normal transfer rate is a control command based on a predetermined format. In the present embodiment, as shown in FIG. 6, a control command is formed by command strings C0 to C5 for Lch 6 subframes in an SPDIF signal having a transfer rate different from the normal transfer rate.

  That is, the format of the control command is specified by a command string C0 indicating the start of the command, command strings C1 to C2 indicating addresses (upper address A1 and lower address A2) specifying the module of the sound source 17, and command strings C1 and C2. A command string C3 to C4 representing parameters (upper data D1 and lower data D2) to be set in the module to be executed, and a command string C5 representing command execution (parameter writing).

  If the received data decoded and output from the SPDIF receiver 16 synchronized with the SPDIF signal having a transfer rate different from the normal transfer rate does not match the above-described format, it is regarded as invalid data that is not a control command, and the determination in step S6 is performed. The result is “NO”, and the present process ends.

  On the other hand, if the received data is a control command that matches the above-described format, the determination result of step S6 is “YES”, and the process proceeds to step S7. In step S7, the received control command (command string C0 to C5) is interpreted and executed. That is, a route instruction is given to the demultiplexer 55 so as to select a module in the sound source 17 designated by the command sequence C1 to C2, and parameters (upper data D1 and lower data D2) represented by the command sequences C3 to C4 are designated. Set the module and finish this process.

  For example, when the filter unit 51 of the sound source 17 is specified by the command sequence C1 (upper address A1) and the sound generation channel and the cut-off parameter are specified by the command sequence C2 (lower address A2), the specified sound channel of the filter unit 51 is specified. The cut-off parameters at are updated to parameters represented by command strings C3 to C4. This makes it possible to change the musical sound modification mode in accordance with the digital audio signal transported from the outside.

C. Other Embodiments Next, other embodiments will be described with reference to FIG. In FIG. 7, the same number is given to the same component as the above-described embodiment (see FIG. 4), and the description thereof is omitted. The other embodiment shown in FIG. 7 is different from the above-described embodiment in that a command generating unit 60 is provided between the SPDIF receiving unit 16 and the sound source 17. The command generator 60 implements a function corresponding to the SPDIF input process of the CPU 10 in the above-described embodiment by hardware.

  That is, the command generator 60 determines whether the SPDIF receiver 16 is synchronized in the normal mode based on the presence or absence of the lock outputs 1 and 2 signals. When the SPDIF receiver 16 is synchronized in the normal mode, the command generator 60 generates a signal SEL corresponding to a user operation (switch operation) for designating an input destination and outputs the signal SEL to the demultiplexer 55 of the sound source 17.

  In addition, the command generation unit 60 supplies reception data DATA (audio sample Audio Sample) decoded by the SPDIF reception unit 16 to the demultiplexer 55. The demultiplexer 55 supplies the received data DATA to a module (one of the filter unit 51, the envelope generation unit 52, the mixer unit 53, and the effect applying unit 35) in the sound source 17 specified by the signal SEL. Thereby, according to the digital audio signal transported from the outside, the reproduction mode of the digital audio signal can be controlled.

  On the other hand, when the SPDIF receiver 16 is not synchronized in the normal mode, the command generator 60 determines whether or not a signal is input based on the output of the input state determination unit 25 (see FIG. 3) of the SPDIF receiver 16. If there is a signal input, it is set in the strobe count value setting unit 23 via the rate setting unit 27 (see FIG. 3) until the SPDIF receiving unit 16 synchronizes with the SPDIF signal having a transfer rate different from the normal transfer rate. The reception setting change for adjusting and changing the strobe count value, the preamble cycle count value set in the preamble cycle count value setting unit 28, and the channel status Fs comparison value set in the channel status Fs comparison value setting unit 33 is repeated.

  When the SPDIF receiver 16 synchronizes with the SPDIF signal having a transfer rate different from the normal transfer rate, the command generation unit 60 receives the received data DATA decoded from the SPDIF receiver 16 from the command sequence C0 to C5. It is determined whether or not the control command has (see FIG. 6). If it is a control command, the command generator 60 interprets and executes the received control command (command string C0 to C5).

  That is, a signal SEL for specifying a module in the sound source 17 specified by the command sequence C1 to C2 is supplied to the demultiplexer 55, and parameters (upper data D1 and lower data D2) expressed by the command sequences C3 to C4 are supplied. A designated module is set via the demultiplexer 55. Thereby, since the parameter of the designated module is updated and the operation mode is changed, the tone modification mode can be changed according to the digital audio signal transported from the outside.

  As described above, in the present embodiment, it is determined whether the SPDIF receiver 16 is in the normal mode synchronized with the SPDIF signal having the normal transfer rate corresponding to the general PCM audio data sampling rate. The audio sample Audio Sample decoded and output by the SPDIF receiving unit 16 is supplied to the designated module of the sound source 17, while if not in the normal mode, the SPDIF receiving unit 16 synchronizes with an SPDIF signal having a transfer rate different from the normal transfer rate. Since the operation mode of the designated module of the sound source 17 is updated by changing to the control mode and interpreting and executing the control command included in the reception data decoded and output by the SPDIF receiver 16 in the control mode, the digital audio transported from the outside Depending on the signal To control the reproduction manner of the digital audio signal, and can change the tone modification manner.

  In the above-described embodiment, an example in which the filter coefficient of the filter unit 51 is changed as a parameter to be updated in the control mode has been described. However, the parameter that can be updated is not limited thereto, and the ADSR envelope level of the envelope generation unit 52 is not limited thereto. It is possible to change the tone modification mode desired by the user by selectively changing the rate, the mixing ratio of the mixer unit 53, or the effect type of the effect applying unit 54.

10 CPU
11 ROM
12 RAM
DESCRIPTION OF SYMBOLS 13 Keyboard 14 Operation part 15 Display part 16 SPDIF receiving part 17 Sound source 18 Sound system 100 Musical sound generator

Claims (5)

In a musical sound generator with a sound source composed of various modules for modifying musical sounds,
Receiving means for receiving and decoding and outputting a transfer signal encoded by the biphase mark method;
Transfer mode determining means for determining whether or not the receiving means is in a normal mode synchronized with a transfer signal at a normal transfer rate;
An input means for inputting received data decoded and output from the receiving means to a sound source designation module when the transfer mode determining means determines the normal mode;
A mode transition means for transitioning the receiving means to a control mode synchronized with a transfer signal having a transfer rate different from the normal transfer rate when the transfer mode determining means determines that the mode is not the normal mode;
Parameter updating means for interpreting and executing a control command included in reception data decoded and output from the receiving means that has been shifted to the control mode by the mode transition means, and updating a parameter that specifies a tone modification mode of a sound source designation module; A musical sound generator characterized by comprising. The receiving means includes a lock output generating means for generating a lock output when synchronized with an SPDIF signal having a normal transfer rate corresponding to a sampling rate of general PCM audio data,
2. The musical sound generating device according to claim 1, wherein the transfer mode determining means determines whether or not the normal mode is set based on whether or not a lock output is generated.   2. The tone generator according to claim 1, wherein the mode transition means comprises reception setting change means for changing the reception setting of the reception means until the mode transition means is synchronized with an SPDIF signal having a transfer rate different from a normal transfer rate. .   The parameter update means comprises a determination means for determining whether or not the received data decoded and output from the reception means synchronized in the control mode is a control command including a parameter for designating a musical tone modification mode. The musical tone generator according to claim 1. A program to be executed by a musical sound generator having a sound source composed of various modules for modifying musical sounds,
A transfer mode determination step of determining whether or not the receiving unit that receives and decodes the transfer signal encoded by the biphase mark method is a normal mode synchronized with the transfer signal of the normal transfer rate;
When it is determined that the normal mode is determined by the transfer mode determination step, an input step for inputting reception data decoded and output from the reception unit to a sound source designation module;
A mode transition step for transitioning the receiving unit to a control mode synchronized with a transfer signal having a transfer rate different from the normal transfer rate when it is determined in the transfer mode determining step that the mode is not the normal mode;
A parameter updating step for interpreting and executing a control command included in the reception data decoded and output from the receiving unit that has transitioned to the control mode in the mode transition step, and updating a parameter that specifies the tone modification mode of the sound source designation module; A program characterized by being executed by a computer.

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