JP2007316396A - Audio control circuit, and method, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio control IC in which synchronous control of both of speech and light emission is possible. <P>SOLUTION: The audio control IC 100 is mounted on an electronic apparatus and controls a speech output section 24 disposed in the electronic apparatus, and controls the luminance of an LED 26 disposed in the electronic apparatus. A data acquisition section 40 acquires the speech data to be outputted from the speech output section 24, and control data Dcnt associated to the speech data and including the lighting pattern of the LED 26 and the light emission data relating to the light emission luminance. An audio control section 50 including an arithmetic processing section 42 and an audio processing section 44 outputs speechs from the speech output part 24 based on the speech data of the acquired control data Dcnt. A light emission control section 52 including the arithmetic processing section 42 and the light emission driving section 46 subjects the luminance of the LED 26 to multi-level control by pulse width modulation based on the light emission data in the acquired control data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an audio control circuit that is mounted on an electronic device and controls an audio output and controls a light emitting state of a light emitting element.

  One technique for playing back music on an electronic device is to play back waveform data of sampled sound. 2. Description of the Related Art In recent years, technologies for executing sound reproduction and light emission of a light emitting element in an electronic device have been developed. As a technique for controlling the light emission intensity of a light emitting element based on audio data, there is a technique that proposes an infrared wireless microphone that controls the light emission intensity of an infrared light emitting LED using a modulated carrier wave signal corresponding to an acoustic signal input to a microphone (for example, a patent). Reference 1).

When the waveform data of music is distributed to an electronic device via a wireless network or a wired network, there is a problem that the transmission time becomes long because the waveform data size of the sound is large. As another method for distributing music data, there is a method in which music data is generated according to an expected standard represented by the MIDI (Musical Instruments Digital Interface) standard, and music data describing sound information is transmitted. MIDI files are not sound waveform data, but only information such as sound tone, pitch, sound on / off, and volume, so the data size is small compared to waveform data, and it is suitable for distribution There is. For example, in mobile phones, it is common to download incoming melody via a wireless network. In that case, the music data can be composed of MIDI files to reduce the amount of data transmission.
Registered Utility Model No. 30671197

  In recent years, electronic devices such as mobile phones are provided with various additional functions, and the additional functions often attract popularity from users. For example, an electronic device such as a mobile phone is provided with a light emitting diode (hereinafter abbreviated as LED) that visually informs a user of an incoming call or is used as a camera flash. Some of these mobile phones change the brightness of the light emitting diodes in synchronization with the incoming melody played from the speaker at the time of the incoming call.

  The present invention has been made in view of these problems, and an object thereof is to provide an audio control circuit capable of controlling a sound output unit such as a speaker and driving a light emitting element.

  One embodiment of the present invention relates to an audio control circuit that is mounted on an electronic device, controls an audio output unit provided in the electronic device, and controls luminance of a light emitting element provided in the electronic device. The audio control circuit includes: a data acquisition unit that acquires control data including audio data to be output from the audio output unit; and light emission data associated with the audio data and related to a lighting pattern of the light emitting element and light emission luminance; and Among the obtained control data, the audio control unit that outputs the sound from the sound output unit based on the sound data, and the luminance of the light emitting element based on the light emission data among the acquired control data is multi-ordered by pulse width modulation. A light emission control unit that performs tone control.

  According to this aspect, the control data includes dedicated light emission data for controlling the light emitting element in addition to the audio data, and therefore the light emission control unit performs light emission of the light emitting element based on the light emission data. The state can be controlled in synchronization with the audio data.

  In one aspect, the light emission data included in the control data may include at least luminance data for setting the luminance of the light emitting element and timing data for instructing timing for changing the luminance. The light emission control unit may execute time management for updating the luminance of the light emitting element at the instructed timing.

  According to this aspect, since the management of the luminance update timing is executed in the light emission control unit, in the external circuit that outputs the light emission data to the audio control circuit, the timing for changing the luminance of the light emitting element is managed. There is no need to do it. Since the audio control circuit has a time management function for processing the audio signal, the light emission luminance can be suitably controlled by using this function.

  In one aspect, the audio data is MIDI data, and the time management of the timing indicated by the timing data and the time management of the delta time specifying the time between events of the MIDI data are executed using the same counter. May be.

  In this case, since the time management of the luminance of the light emitting element and the time management of the audio signal are executed using the same counter, the processing can be performed efficiently.

  In one aspect, the audio data and the light emission data included in the control data are acquired as a FIFO (First In First Out) command including data instructing the timing at which the command is to be executed. The timing instructed by the command may be time-managed and a predetermined process may be executed.

  In a certain aspect, the light emission control part may update the brightness | luminance of a light emitting element for every unit processing time of control by an audio control part. The unit processing time may be a frame time.

  In one embodiment, the light emitting element may be a three-color light emitting diode.

  In one aspect, the light emission control unit includes a correction data acquisition unit that acquires correction data of pulse width modulation that is set in advance for each electronic device on which the audio control circuit is mounted, and a luminance that is instructed by the light emission data. A data correction unit that corrects the pulse width with the correction data acquired by the correction data acquisition unit, and a pulse width modulation unit that controls the light emitting element by pulse width modulation according to the output of the data correction unit may be included. .

  According to this aspect, the luminance control according to the sound data is executed by the emission data that changes every moment according to the time, and the correction data given in a fixed manner is used for correcting the luminance variation of the light emitting element. be able to.

  Another embodiment of the present invention is an electronic device. This electronic apparatus includes an audio output unit that outputs audio, a light emitting element, and the audio control circuit according to any one of the above-described modes for controlling the audio output unit and the light emitting element.

  It should be noted that any combination of the above-described constituent elements, or those obtained by replacing constituent elements and expressions of the present invention with each other among methods, apparatuses, systems, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, while controlling audio | voice output parts, such as a speaker, the audio control circuit which can drive a light emitting element is provided.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 shows an external configuration of an electronic device 10 having a light emission control function according to an embodiment of the present invention. The electronic device 10 shown here is configured to have a communication function, an audio output function, and a light emission control function. The electronic device 10 is, for example, a mobile phone, and includes an incoming call display unit 1, a speaker 2 that is an audio output unit, and an LCD monitor 20 that is a video output unit. Here, a two-foldable mobile phone is shown as the electronic device 10, but it may not be a foldable. In addition to the mobile phone, the electronic device 10 may be a mobile terminal device such as a PDA (Personal Digital Assistance) or a portable game machine, or may be an alarm clock, a radio, an audio device, or the like. In any case, the electronic device 10 is configured to have at least an audio output function and a light emission control function, and may or may not be portable.

  The incoming call display unit 1 includes a light emitting element such as a light emitting diode (hereinafter referred to as “LED”). The incoming call display unit 1 has LEDs of three colors, red (R), green (G), and B (blue). When an incoming call is detected, these LEDs are lit in a predetermined manner, and this light emission Notify users of incoming calls. These LEDs emit light in a manner synchronized with the ring tone output from the speaker 2. Various colors can be created by causing each of the three color LEDs to emit light independently.

  The LCD monitor 20 includes an LED as a light source for the backlight, and displays a time using, for example, a clock during non-calling. The LCD monitor 20 may display the same display as that of the incoming call display unit 1 when receiving an incoming call, for example, and may control the output light in synchronization with the ringing tone output from the speaker 2.

  FIG. 2 shows functional blocks of the electronic device 10 according to the embodiment. The electronic device 10 includes an operation unit 12, a light emitting unit 14, a processing unit 18, an LCD monitor 20, a communication processing unit 22, an audio output unit 24, and an audio control IC 100.

  The operation unit 12 includes a button for the user to input a telephone number or the like. The light emitting unit 14 includes a plurality of light emitting elements, that is, LEDs 26 of three colors of red, green, and blue, and is incorporated in the incoming call display unit 1 in FIG. The light emitting unit 14 may be incorporated as a backlight of the LCD monitor 20.

  The communication processing unit 22 is a communication unit that executes processing necessary for communication. Specifically, the communication processing unit 22 detects an incoming call from an external telephone or server, or transmits to an external telephone or server. Here, the term “incoming call” includes not only incoming calls but also incoming calls of packet communication from a server via a network. The same applies to outgoing calls. As the mobile phone system, a PDC (Personal Digital Cellular System) system may be adopted, and a simple mobile phone system, a CDMA (Code Division Multiple Access) system, or a GSM mobile communication system may be used. Also good.

  The communication processing unit 22 downloads the incoming melody from the external server via the network. At this time, in order to reduce the data transmission amount, the communication processing unit 22 downloads a music file in which music data is described. The music file describing the music data is typically a MIDI file, and may be constituted by the GM standard that is now a de facto industry standard. Note that music files described in other standards may be used, and in any case, there is an advantage that the transmission amount is small as compared with the case where the waveform data of music is downloaded. The downloaded music file is stored in the memory 32. In the following, as an example, the case where the ring tone data is described in the MIDI standard will be described.

  The processing unit 18 comprehensively controls the entire process of the electronic device 10 and includes a CPU (Central Processing Unit) 30 and a memory 32. The memory 32 may be configured to use an external memory. The CPU 30 corresponds to a baseband IC, and controls the sound output by the sound output unit 24 and the LED light emission by the light emitting unit 14 by outputting the control data Dcnt to the audio control IC 100 when there is an incoming call. It has.

  In the present embodiment, the control data Dcnt includes audio data Daud and light emission data Dlum. The audio data Daud includes information related to audio to be output from the audio output unit 24. The light emission data Dlum is data associated with the audio data Daud, and is data related to the lighting pattern and light emission luminance of the light emitting unit 14. As will be described later, the light emission data Dlum has the same data format as the audio data Daud.

  When notified by the communication processing unit 22 that there is an incoming call, the CPU 30 analyzes the control data Dcnt stored in the memory 32, breaks it into commands, and transmits it to the audio control IC 100. The commands are MIDI control tone-on and tone-off, commands for changing the light emission luminance of the light emitting element, and the like. Accordingly, the audio control IC 100 can control the light emission of the light emitting unit 14 in accordance with the music sound output from the audio output unit 24. As a result, it is possible to control the light emission timing of each color at a timing suitable for the music, and it is possible to simultaneously enjoy the user's vision and hearing.

  FIG. 3 is a block diagram showing a configuration of the audio control IC 100 according to the embodiment. As described above, when the communication processing unit 22 receives an incoming call, the audio control IC 100 controls the audio output unit 24 to reproduce a predetermined ringtone for the purpose of notifying the user of the incoming call. The audio control IC 100 controls the light emission of the light emitting unit 14 in synchronization with the reproduction of the ring tone. These controls are executed based on the control data Dcnt output from the processing unit 18.

  The audio control IC 100 includes a data acquisition unit 40, an arithmetic processing unit 42, an audio processing unit 44, and a light emission driving unit 46.

  The data acquisition unit 40 acquires the control data Dcnt output from the processing unit 18. The data acquisition unit 40 is, for example, a FIFO, and the control data Dcnt is input as a FIFO command. The control data Dcnt input to the data acquisition unit 40 is read by the arithmetic processing unit 42 in order from the oldest.

  The arithmetic processing unit 42 is a unit that executes predetermined arithmetic processing based on a loaded program or as a state machine. The arithmetic processing unit 42 executes processing according to the control data Dcnt input to the data acquisition unit 40. As described above, in the present embodiment, the control data Dcnt includes the audio data Daud and the light emission data Dlum. However, when the control data Dcnt is the audio data Daud, the arithmetic processing unit 42 performs audio signal processing. When the control data Dcnt is the light emission data Dlum, the light emitting element is controlled.

  In the present embodiment, the function as the audio control unit 50 that outputs audio from the audio output unit 24 based on the audio data Daud is realized by a part of the function of the arithmetic processing unit 42 and the function of the audio processing unit 44. The

  For example, when voice data Daud, which is a MIDI command, is input, the arithmetic processing unit 42 executes processing according to the command. As an example, the arithmetic processing unit 42 analyzes a MIDI command and executes assigner processing, pitch envelope processing, filter envelope processing, amplifier envelope processing, or the like. Details of these processes are common sense for those skilled in the art, and thus the description thereof is omitted here.

  The audio processing unit 44 at the subsequent stage reads WAVE data stored in a ROM (Read Only Memory) or the like according to the data obtained by the arithmetic processing unit 42, generates a digital signal for each voice, and generates a plurality of voice signals. Perform the mixing process. Further, the audio processing unit 44 may execute DA converter processing for converting a digital audio signal into an analog audio signal, and effect processing such as reverberation and chorus.

  Note that the processing of the arithmetic processing unit 42 described here and the processing of the audio processing unit 44 are examples, and the function of the audio processing unit 44 described here may be realized in the arithmetic processing unit 42, or the arithmetic processing The function of the unit 42 may be realized by the audio processing unit 44.

  Hereinafter, an example of a data format in a MIDI file is shown as a music file in which music data is described.

FIG. 4A shows a note-on message format. Hereinafter, items included in the format will be described.
Delta Time indicates the elapsed time from the event immediately before the music data.
Track Number (track number) specifies the track number to be used, and indicates 0, 1, 2,...
Voice Number indicates the voice number in the track as 0, 1, 2, 3 in the order of appearance.
Tone ON indicates that the sound is on. Tone on is assigned 1 as the value. Therefore, when the tone-on bit is 1, it indicates that there is a sound to be output. In this embodiment, audio output is performed when a tone-on bit is present.
Key [6: 0] (key) indicates the scale of pronunciation.

The timbre indicates the timbre of the sound source. For example, a timbre number 1 is assigned a piano timbre, and a timbre number 2 is assigned a guitar timbre. This assignment is determined by the MIDI sound source to be used.
L-Volume indicates the volume of the left channel.
R-Volume indicates the volume of the right channel.

  FIG. 4B shows a note-off message format. Here, Tone OFF (tone off) indicates sound off. Tone off is assigned a value of 0. In the present embodiment, audio output is stopped when the tone-off bit exists.

  Upon receiving the note-on message, the arithmetic processing unit 42 and the audio processing unit 44 read out the WAVE data of the specified tone color from the track specified in the data format, and the signal of the specified scale and volume is converted into the Delta Time Output at the timing indicated by (delta time). Note that a circuit for processing a MIDI file such as the arithmetic processing unit 42 and the audio processing unit 44 in the present embodiment has a function for measuring the instructed timing. This function is generally realized by counting clock signals.

  On the other hand, in the present embodiment, the function as the light emission control unit 52 that performs multi-gradation control of the luminance of a plurality of LEDs by pulse width modulation based on the light emission data Dlum is a part of the function of the arithmetic processing unit 42 and the light emission. This is realized by the function of the drive unit 46.

For example, when the light emission data Dlum is input, the arithmetic processing unit 42 analyzes the command and executes a process according to the analyzed content. As an example, the light emission data Dlum desirably has a format including at least the following two data.
(1) Luminance data for setting the luminance of the light emitting element (2) Timing data for instructing the timing for changing the luminance

  The luminance data of (1) is a value associated with the pulse width when the luminance of the LED 26 is controlled by pulse width modulation described later. The timing data (2) is, for example, data for designating the time from the previous event until the luminance is updated by the input light emission data Dlum. In this case, the delta time (delta time) of the MIDI data is used. ). The previous event may be an event generated by the light emission data Dlum or an event (note-on, note-off, etc.) generated by the audio data Daud. However, in the following, in order to simplify the description, it is assumed that the timing data designates the time from the luminance update by the previous light emission data Dlum to the next luminance update.

  The light emission control unit 52 including the arithmetic processing unit 42 measures the timing indicated by the timing data of (2), updates the luminance of the LED 26 according to the luminance data of (1), and then acquires the light emission data Dlum. Until that time, the brightness is maintained. The data of (1) and (2) may be input as commands separately for each of the three color LEDs, or data for controlling the three color LEDs may be included in one command.

  That is, the measurement of the timing instructed by the timing data in the light emission control unit 52 and the measurement of the delta time designated between the MIDI data events in the audio control unit 50 are performed in the same manner. Furthermore, these time managements may be executed while sharing the same counter.

  Next, the timing at which the luminance of the LED 26 is updated in the light emission control unit 52 will be described. In general, in a processing unit for processing a MIDI file, when the sampling period of the audio signal is Ts, various signal processings are performed using a frame time Tfr given by Tfr = N · Ts (N is a natural number) as one unit processing time. It is carried out. Various values such as 256, 512, and 1024 are selected as N.

  The light emission control unit 52 may update the luminance of the LED 26 for each frame time Tfr. If the timing indicated by the timing data does not match the frame time Tfr, the luminance may be updated at the nearest frame time Tfr. By updating the luminance of the LED 26 in association with the frame time Tfr, time management in the light emission control unit 52 can be simplified.

  The light emission drive unit 46 is configured to include a switch element provided on the current path of the LED 26, and based on the output from the arithmetic processing unit 42, the switch element is repeatedly turned on and off by pulse width modulation, so that the LED The light emission luminance is controlled by controlling the ratio between the on time and the off time.

  The operation of the audio control IC 100 configured as described above will be described. FIGS. 5A and 5B are timing charts of luminance control by the audio control IC 100 according to the embodiment. FIG. 5A shows the timing at which the light emission data Dlum is output as a command from the processing unit 18, and FIG. 5B shows the luminance set by the light emission control unit 52. Here, the luminance update of one LED will be described, but the same processing is performed for the other LEDs. In the time chart, the horizontal axis is shown differently from the actual signal.

  The timing at which the light emission data Dlum is output from the processing unit 18 is irrelevant to the luminance update timing, and is not particularly temporally managed in the processing unit 18. Audio data Daud exists between the respective light emission data Dlum, but is not shown.

  Assume that the luminance is updated to X0 at time t0. Hereinafter, the luminance data of the i-th light emission data Dlumi will be described as Xi, and the timing data will be described as Δti.

  Next, the light emission data Dlum1 is input to the data acquisition unit 40 at time t1. Thereafter, at a certain timing, the arithmetic processing unit 42 reads the light emission data Dlum2 from the data acquisition unit 40. Assuming that the timing data Δt1 of the light emission data Dlum1 is 8 ms, the brightness is updated to X1 at the previous brightness update, that is, at time t2 after 8 ms has elapsed from time t0.

  Next, at time t3, the light emission data Dlum2 is input. When the timing data Δt2 is 16 ms, the luminance is updated to X2 at the time t5 after 16 ms has elapsed from the time t3 when the previous luminance update occurred.

  Here, the time interval of the luminance update timing shown at times t0, t2, t5, and t6 is set to an integral multiple of the frame time Tfr.

  If the timing data Δt3 of the luminance data Dlum3 input at time t4 is a time different from the frame time, for example, 10 ms, the arithmetic processing unit 42 updates the luminance every frame time, so the nearest frame time And the luminance is updated at time t6.

  In this example, the timing data has been described with respect to the case where the time from the previous luminance update to the next luminance update is specified. However, the timing data may specify the elapsed time from the previous MIDI event.

  According to the audio control IC 100 according to the present embodiment, by adding the emission data Dlum that controls the luminance of the LED 26 to the control data Dcnt output from the processing unit 18 to the audio control IC 100, in addition to the MIDI data, the audio data Light emission control synchronized with the sound reproduced from the output unit 24 can be realized.

  Further, since the light emission data Dlum has data instructing the timing of updating the luminance of the light emitting element, the time management of the light emission control can be executed by the audio control IC 100. Since the audio control IC 100 is originally designed to perform processing such as MIDI data, it has excellent time management, and as a result, the light emission control can be well synchronized with the sound.

  If the time management of the light emission control is executed on the processing unit 18 side, the CPU 30 measures the luminance update timing, outputs luminance data to the audio control IC 100 at each timing, and emits the luminance. Will be updated. In this case, the processing in the CPU 30 becomes very heavy. On the other hand, according to the audio control IC 100 according to the present embodiment, by providing timing data, it is not necessary to perform time management of light emission control by the external processing unit 18, and the processing of the processing unit 18 can be performed. There is an advantage that the burden can be reduced. That is, the CPU 30 can output the light emission data Dlum to the data acquisition unit 40 that is a FIFO without any particular restriction on timing.

  FIG. 6 is a circuit diagram illustrating a configuration example of the light emission drive unit 46, the LED 26, and peripheral circuits. The light emission drive unit 46 includes a first light emission control unit 106, a second light emission control unit 108, a switch unit 110, and a main drive circuit 112.

  The first light emission control unit 106 includes a PWM control unit 132, a first PWM circuit 134 a that is collectively referred to as a PWM circuit 134, a second PWM circuit 134 b, a third PWM circuit 134 c, and a data acquisition unit 133. The second light emission control unit 108 includes a setting control unit 138, a first setting circuit 140a that is collectively referred to as a setting circuit 140, a second setting circuit 140b, and a third setting circuit 140c. The switch unit 110 includes a transistor Tr1, a transistor Tr2, and a transistor Tr3. The main drive circuit 112 includes a first variable current circuit 144a, a second variable current circuit 144b, and a third variable current circuit 144c, which are collectively referred to as a variable current circuit 144. including.

  The voltage generator 102 is a switching regulator or a charge pump circuit, and boosts and outputs the output voltage of the battery.

  The first LED 26a emits green light, the second LED 26b emits blue light, and the third LED 26c emits red light. Here, since the first LED 26a and the second LED 26b generally operate at a driving voltage of about 4.5V, the aforementioned boosted voltage Vod is set to 4.5V. On the other hand, since the third LED 26c generally operates with a driving voltage of about 2.5V, Vr is set to 2.5V. In order to drive the LED 26, a main drive circuit 112, which will be described later, passes a current of about 25 mA at maximum.

  The transistor Tr2 to the transistor Tr4 are switch elements provided on the path of the LED 26, and block or conduct between the LED 26 and the main drive circuit 112. That is, when the voltage applied to the gate of the transistor Tr2 becomes H level and the transistor Tr2 is turned on, the first LED 26a and a first variable current circuit 144a described later are brought into conduction. The transistors Tr3 and Tr4 operate in the same manner, and the corresponding LEDs 26 are lit during the period in which the transistors Tr2 to Tr4 are ON. Here, the transistors Tr2 to Tr4 are assumed to be independently turned on by a first light emission control unit 106 described later.

  The setting control unit 138 controls the magnitude of the drive current that flows through the variable current circuit 144. In order to increase the luminance of the LED 26, the operation of the setting circuit 140 is controlled so that the drive current passed through the variable current circuit 144 is increased.

  The data acquisition unit 133 acquires the pulse width control data output from the arithmetic processing unit 42. This pulse width control data corresponds to the luminance data in FIG. 5B, and is input at each luminance update timing (time t1, t2, t5, t6) shown in FIG. 5B. The PWM control unit 132 generates a pulse signal having a pulse width (duty ratio) designated by the pulse width control data, and outputs the pulse signal to the PWM circuits 134a to 134c. A pulse signal is generated for each LED. The PWM circuits 134a to 134c control on / off of the transistors Tr2 to Tr4 based on the input pulse signal, and adjust the luminance of the LEDs 26a to 26c.

In order to reduce variation in luminance for each LED, the light emission drive unit 46 may have the following configuration.
FIG. 7 is a block diagram illustrating a configuration example of the first light emission control unit 106 of the light emission driving unit 46. The first light emission control unit 106 includes a correction data acquisition unit 70 and a data correction unit 72 in addition to the configuration of FIG.

  The data acquisition unit 133 acquires, from the arithmetic processing unit 42, data X (also referred to as pulse width data) indicating a pulse width corresponding to the luminance specified by the light emission data Dlum. The pulse width data X may be composed of two data indicating the rising and falling timings of the pulse signal.

  The correction data acquisition unit 70 acquires pulse width modulation correction data set in advance for each electronic device on which the audio control circuit is mounted. For example, the correction data acquisition unit 70 is configured as a register. The correction data Y includes, for example, data that shifts the rising and falling timings of the pulse width data X back and forth.

  The data correction unit 72 corrects the pulse width data X corresponding to the luminance with the correction data Y acquired by the correction data acquisition unit 70. Data Z corrected by the data correction unit 72 is output to the PWM control unit 132. The pulse width correction process is executed for each color of the LED.

  In one embodiment, the correction data Y can be used to correct individual variations in the brightness of the LEDs 26. That is, the luminance of the LED 26 is measured in advance under a predetermined condition, a correction value that decreases the pulse width is set for a bright LED, and a correction value that increases the pulse width is set for a dark LED. Set. As a result, the duty ratio of the pulse for actually turning on and off the transistors Tr2 to Tr4 of the switch unit 110 can be corrected, and the luminance of the LEDs can be made uniform.

  In the present embodiment, since the correction process is executed by the first light emission control unit 106, there is no need to consider the variation in the luminance of the LED in the calculation processing unit 42 or further in the previous processing unit 18, and the calculation process It is possible to reduce the calculation processing amount of the unit 42 and the processing unit 18.

  In the present embodiment, each element described as a functional block for performing various processes can be configured with a CPU, a memory, and other LSIs in terms of hardware, and in a memory in terms of software. Realized by a loaded program. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof, and is not limited to any one.

  In the above, this invention was demonstrated based on the Example. The embodiments are exemplifications, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. .

  For example, in the embodiment, the case where MIDI data is used as audio data has been described. However, the present invention is not limited to this, and data formats corresponding to various formats used at present or in the future may be used.

It is a figure which shows the external appearance structure of the electronic device which has the light emission control function based on an Example. It is a figure which shows the functional block of an electronic device. It is a block diagram which shows the structure of the audio control IC which concerns on embodiment. 4A shows a note-on message format, and FIG. 4B shows a note-off message format. FIGS. 5A and 5B are timing charts of luminance control by the audio control IC according to the embodiment. It is a circuit diagram which shows the structural example of a light emission drive part, LED, and a peripheral circuit. It is a block diagram which shows the structural example of the 1st light emission control part of the light emission drive part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Electronic device, 14 Light emission part, 24 Audio | voice output part, 40 Data acquisition part, 50 Audio control part, 52 Light emission control part, 133 Data acquisition part

Claims (10)

An audio control circuit that is mounted on an electronic device, controls an audio output unit provided in the electronic device, and controls the luminance of a light emitting element provided in the electronic device,
A data acquisition unit for acquiring control data including audio data to be output from the audio output unit, and light emission data associated with the audio data and relating to a lighting pattern and light emission luminance of the light emitting element;
Among the acquired control data, an audio control unit that outputs sound from the sound output unit based on the sound data; and
Among the acquired control data, based on the light emission data, a light emission control unit that performs multi-tone control of the luminance of the light emitting element by pulse width modulation;
An audio control circuit comprising: The audio control circuit according to claim 1.
The light emission data included in the control data is at least:
Luminance data for setting the luminance of the light emitting element;
Timing data for instructing the timing of changing the brightness,
Including
The said light emission control part performs the time management for updating the brightness | luminance of the said light emitting element at the instruct | indicated timing, The audio control circuit characterized by the above-mentioned. The audio control circuit according to claim 2.
The audio data is MIDI (Musical Instrument Digital Interface) data,
An audio control circuit, wherein time management at a timing indicated by the timing data and time management at a delta time for designating a time between MIDI data events are executed using the same counter. The audio control circuit according to claim 1.
The audio data and the light emission data included in the control data are acquired as a FIFO (First In First Out) command including data instructing the timing at which the command should be executed.
The audio control circuit according to claim 1, wherein the audio control unit and the light emission control unit time-control timing designated by a FIFO command and execute a predetermined process. The audio control circuit according to any one of claims 1 to 4,
The said light emission control part updates the brightness | luminance of the said light emitting element for every unit processing time of the control by the said audio control part, The audio control circuit characterized by the above-mentioned. The audio control circuit according to claim 5.
The audio processing circuit according to claim 1, wherein the unit processing time is a frame time. The audio control circuit according to any one of claims 1 to 4,
The audio control circuit according to claim 1, wherein the light emitting element is a light emitting diode of three colors. An audio control circuit according to any one of claims 1 to 4,
The light emission control unit
A correction data acquisition unit that acquires correction data of pulse width modulation that is set in advance for each electronic device in which the audio control circuit is mounted;
A data correction unit that corrects the pulse width according to the luminance instructed by the light emission data by the correction data acquired by the correction data acquisition unit;
In accordance with the output of the data correction unit, a pulse width modulation unit that controls the light emitting element by pulse width modulation;
An audio control circuit comprising: An audio output unit for outputting audio;
A light emitting element;
An audio control circuit for controlling the sound output unit and controlling the light emission luminance of the light emitting element;
With
The audio control circuit
A data acquisition unit for acquiring control data including audio data to be output from the audio output unit, and light emission data associated with the audio data and relating to a lighting pattern and light emission luminance of the light emitting element;
Among the acquired control data, an audio control unit that outputs voice from the voice output unit based on voice data;
Among the acquired control data, based on the light emission data, a light emission control unit that performs multi-tone control of the luminance of the light emitting element by pulse width modulation;
An electronic device comprising: A control method for controlling a sound output unit mounted on an electronic device and controlling luminance of a light emitting element provided in the electronic device,
Obtaining control data including sound data to be output from the sound output unit, and light emission data associated with the sound data and relating to a lighting pattern and light emission luminance of the light emitting element;
Of the acquired control data, based on the sound data, a sound control step of outputting sound from the sound output unit;
Among the acquired control data, based on the light emission data, a light emission control step of controlling the luminance of the light emitting element by multi-gradation by pulse width modulation,
A control method comprising:

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