JP4893089B2 - Audio processing apparatus and method - Google Patents

Description

  The present invention relates to an audio processing apparatus and method for outputting an interrupt sound such as a guidance sound of a car navigation apparatus from a speaker by interrupting an interrupted sound such as a music reproduction sound.

  In Patent Document 1, when an interrupt sound such as a guidance voice of a car navigation device or a ringing sound of a car telephone system is generated during an output period of a playback sound of a music or the like, a sound obtained by synthesizing the playback sound from the speaker and the interrupt sound is generated. Disclosure of output or switching from a reproduction sound to an interrupt sound for output (paragraph 0007 of Patent Document 1).

  Patent Document 2 is a vehicle-mounted multi-playback device that simultaneously plays a plurality of music pieces on one recording medium and outputs the same to a corresponding user. A predetermined sound or the like is input from an external device such as a car navigation device or a hands-free phone. Then, it is disclosed that the user terminal corresponding to the driver interrupts and outputs the sound from the external device instead of the music reproduction sound (step A1 in FIG. 7 of FIG. 7 and FIG. 6). 103).

  FIG. 8 is a configuration diagram of a conventional in-vehicle audio processing apparatus 100. The in-vehicle audio processing device 100 outputs a guidance voice from the car navigation device 14 when the vehicle reaches a predetermined point during the route guidance period, as in the in-vehicle audio processing device 10 (FIG. 1) described later. It is like that. In the configuration diagram of the in-vehicle audio processing apparatus 100, the same components as those of the in-vehicle audio processing apparatus 10 described later are designated by the same reference numerals, and description thereof is omitted. The main points of the vehicle-mounted audio processing apparatus 100 will be described.

  The DSP (Digital Signal Processor) 11 receives the audio signals of the left and right channels from the A / D converter 18 in a time-division manner through the data line 19 during a reproduction period of music, etc., and performs predetermined processing. The left and right channel audio signals after processing are sent to the data line 27 in a time division manner.

  The car navigation device 14 is configured to output monaural navigation sound (guidance sound) when the vehicle reaches a predetermined point during route guidance. The navigation voice is sent to the A / D converter 24 via, for example, a left channel (Lch) voice Lch signal line 23l. The A / D converter 24 has input terminals dedicated to the left and right channels, A / D (analog / digital) conversion of the input signals to these input terminals in a time division manner, and a single data line 25 in the time division manner. To send.

  FIG. 9 is a timing chart of signals related to the data line 25 of FIG. The LR clock is sent from the DSP 11 to the A / D converter 24 via the LR clock line 41 (FIG. 2). The A / D converter 24 inputs the left or right channel (Rch) based on the LR clock. A signal at the terminal is selected and A / D converted. Data indicates an assigned channel in the data line 25, and the data line 25 transmits a digital signal A / D converted by the DSP 11 from the A / D converter 24 to the DSP 11 in a time division manner. In the in-vehicle audio processing apparatus 100, the right channel input terminal is unused in the A / D converter 24, and therefore, the navigation voice is assigned only to the left channel slot in the data from the A / D converter 24. The right channel slot is empty.

  Returning to FIG. 8, in the in-vehicle audio processing apparatus 100, the voice switching in the DSP 11 is performed by a control signal from the DSP control microcomputer 12 (described as “navigation voice switching” in FIG. 8). Yes. Accordingly, when the car navigation device 14 generates the navigation voice, the car navigation device 14 outputs the navigation voice to the A / D converter 24 via the Lch signal line 23l and also issues a request signal (navigation voice request) for causing the DSP 11 to switch the voice. Send to the DSP control microcomputer 12.

  When the DSP control microcomputer 12 receives the navigation voice request from the car navigation device 14, it sends a navigation voice switching control signal to the DSP 11. When the DSP 11 receives a control signal for switching the navigation voice from the DSP control microcomputer 12 during the period of reproducing music from the data lines of the left and right channels based on the audio signal from the A / D converter 18, for example, The output speaker for the channel is switched to the navigation voice.

  Note that the navigation audio is described in association with the left channel on the assumption that the in-vehicle audio processing device 100 (the same applies to an in-vehicle audio processing device 110 described later) is mounted on a left-hand drive vehicle. In the case of a right-hand drive vehicle, the navigation voice is associated with the right channel.

  FIG. 10 is a block diagram of another conventional in-vehicle audio processing apparatus 110. In FIG. Among the components of the in-vehicle audio processing device 110, the same components as those in the in-vehicle audio processing device 100 described above are designated by the same reference numerals, description thereof will be omitted, and the main points will be described.

  In the in-vehicle audio processing device 110, the GP11 (General Purpose Input / Output) of the DSP 11 is used for switching to the navigation sound in the DSP 11. GPIO is a general-purpose terminal for inputting a high level / low level (High / Low) from the outside to the IC and for outputting the high level / low level to the outside by the IC.

In the in-vehicle audio processing device 110, the DSP 11 has a GPIO 113. The car navigation device 14 has a control signal output terminal connected to the GPIO 113 via a control line 114. When the car navigation device 14 generates the navigation voice, it outputs it to the A / D converter 24 via the Lch signal line 23l and controls a request signal (navigation voice request) for causing the DSP 11 to switch the voice. Send to GPIO 113 of DSP 11 via line 114. When the DSP 11 receives a navigation voice switching control signal from the car navigation device 14 to the GPIO 113 during a period in which music or the like is reproduced from the left and right speakers based on the audio signal from the A / D converter 18, for example, While releasing the music playback sound from the speaker, the navigation voice from the left speaker is output.
JP 2004-320582 A JP 2005-259187 A

  In the in-vehicle audio processing device 100, switching from the reproduction sound of music or the like in the DSP 11 to the navigation sound of the car navigation device 14 is performed via the DSP control microcomputer 12, so that the switching in the DSP 11 is delayed and the navigation sound is output from the speaker. The head breaks easily.

  On the other hand, in the in-vehicle audio processing apparatus 110, the navigation sound request is directly sent from the car navigation apparatus 14 to the DSP 11 by using the GPIO terminal 113 of the DSP 11, and therefore the switching delay to the navigation sound in the DSP 11 is avoided. it can. However, direct control is difficult to adopt for the DSP 11 that is not equipped with a GPIO terminal. Even if the DSP 11 is equipped with GPIO terminals, the number of GPIO terminals is limited, and the GPIO terminals should be left for other direct control of the DSP 11.

  Patent Documents 1 and 2 disclose that the navigation voice of the car navigation device 14 is interrupted during music reproduction, but do not mention the use of the GPIO terminal and make no mention of speeding up the voice switching in the DSP. Absent.

  An object of the present invention is to provide an audio capable of speeding up the sound switching and synchronizing the interrupt sound and the control signal while avoiding the use of general-purpose input / output for the DSP that performs the source switching of the output sound to each speaker. It is to provide a processing apparatus and method.

The audio processing apparatus of the present invention has the following.
A first data line for transmitting a plurality of channels of audio signals from a first audio source by time division multiplexing;
Of the monaural audio signal from the second audio source and the control signal, the monaural audio signal is transmitted on one channel of time division multiplexing, and the control signal is transmitted on the other channel of time division multiplexing. Data lines, and
The first and second data lines are connected to separate first and second audio signal input terminals, and each channel signal input from the first audio signal input terminal and the second The signal of one channel input from the audio signal input terminal is processed as an input audio signal, the signal of the other channel input from the second audio signal input terminal is processed as a control signal, and each input audio signal is processed. And the audio signal output to the speaker corresponding to each channel, the control signal input from the second data line connected to the second input terminal is in an analog signal state before digital conversion. DSP controlled based on the amplitude category to which the amplitude value belongs.

The audio processing method of the present invention includes the following steps.
Transmitting a plurality of channels of audio signals from the first audio source to the DSP via the first data line by time division multiplexing;
Out of the monaural audio signal and the control signal from the second audio source to the DSP via the second data line, the monaural audio signal is transmitted through one channel of time division multiplexing, and the control signal is time division multiplexed. Transmitting on the other channel; and
In a DSP in which the first and second data lines are connected to separate first and second audio signal input terminals, the signal of each channel input from the first audio signal input terminal and the second The signal of one channel input from the audio signal input terminal is processed as an input audio signal, the signal of the other channel input from the second audio signal input terminal is processed as a control signal, and each input audio is processed. The relationship between the signal and the output audio signal to the speaker corresponding to each channel is as follows. The control signal input from the second data line connected to the second input terminal is in an analog signal state before digital conversion. Control based on the amplitude classification to which the amplitude value at the time belongs.

  According to the present invention, attention is paid to the fact that an empty channel is generated because the audio signal is monaural on a data line capable of transmitting a plurality of audio signals in a time-division manner. Sends a control signal to the DSP using the slot for the empty channel. Therefore, it is possible to prevent a delay in switching the output in the DSP, which is likely to occur when a control signal is sent to the DSP via the DSP control microcomputer. In addition, by avoiding the use of general-purpose input / output of the DSP, it can be applied to a DSP that does not have general-purpose input / output. It can be reserved for other control than control.

  FIG. 1 is a schematic configuration diagram of an in-vehicle audio processing apparatus 10. The in-vehicle audio processing device 10 includes a DSP 11, a DSP control microcomputer 12, an audio source 13, a car navigation device 14, and left and right speakers (not shown) as main components.

  The DSP 11 receives various control signals from the DSP control microcomputer 12 and executes corresponding control based on the control signals. The DSP 11 receives the control signal related to the output control of the navigation voice to the speaker not from the DSP control microcomputer 12 but via the A / D converter 24.

  The audio source 13 is an auxiliary input terminal (AUX), a CD player, an MD player, a tuner, or the like that can be freely connected with a cable to a portable digital player or the like. The Lch and Rch signal lines 17l and 17r are connected to the audio source 13. The analog audio signals of the left and right channels are sent to the A / D converter 18. The A / D converter 18 alternately A / D-converts the inputs from the Lch and Rch signal lines 17l and 17r in a time division manner, and sends the left and right channel digital audio signals to one data line 19 in a time division manner. To do. The data line 19 transmits them to the DSP 11.

  The car navigation apparatus 14 sends the navigation voice (guidance voice related to the guidance route) and the navigation control signal as monaural audio signals to the A / D converter 24 via the Lch and Rch signal lines 23l and 23r. The A / D converter 24 alternately A / D-converts the inputs from the Lch and Rch signal lines 23l and 23r in a time division manner, and converts the digital navigation voice and the navigation control signal to a single data line 25 in a time division manner. Send it out. The DSP 11 extracts a control signal together with the monaural audio signal from the car navigation device 14 by the input from the data line 25.

  In the example of FIG. 1, the navigation voice is Lch and the navigation control is Rch, but the navigation voice may be Rch and the navigation control may be Lch.

  The DSP 11 controls output to the data line 27 based on the navigation control signal from the data line 25. The data line 27 transmits the left and right channel digital audio signals from the DSP 11 to the D / A converter 28 in a time division manner. The D / A converter 28 D / A converts the left and right channel audio signals from the data line 27 in a time-sharing manner, and outputs the left and right channel analog audio signals to the Lch and Rch signal lines 29l and 29r. Cables (not shown) to the left and right data lines are connected to the output side terminals of the Lch and Rch signal lines 29l and 29r.

FIG. 2 is a configuration diagram of a main part of the in-vehicle audio processing apparatus 10. The audio signal flows in the order of the analog area 33, the digital area 34, and the analog area 35. The A / D converters 18 and 24 are located at the boundary between the analog area 33 and the digital area 34, and the D / A converter 28 is located at the boundary between the digital area 34 and the analog area 35. The Lch and Rch signal lines 17l, 17r, 23l, and 23r belong to the analog region 33. The DSP 11 belongs to the digital area 34. The Lch and Rch signal lines 29l and 29r belong to the analog region 35. The data lines 19, 25, and 27 correspond to the three-line (data line, LR clock line, and bit clock line) communication adopted for I ² S and the justified communication method.

  Between the DSP 11 and the A / D converter 18, the data line 19 transmits left and right channel digital audio signals (Data) from the A / D converter 18 to the DSP 11. The LR clock signal (LRCK) and the bit clock signal (BCK) are transmitted from the DSP 11 to the A / D converter 18 via the LR clock line 37 and the bit clock line 38. Similarly, between the DSP 11 and the A / D converter 24, the data line 25 transmits the left channel audio signal and the navigation control signal from the A / D converter 24. The LR clock signal and the bit clock signal are transmitted from the DSP 11 to the A / D converter 24 via the LR clock line 41 and the bit clock line 42.

  Between the DSP 11 and the D / A converter 28, the data line 27, the LR clock line 45 and the bit clock line 46 transmit signals from the DSP 11 to the D / A converter 28. The data line 27 transmits the digital audio signals of the left and right channels in a time division manner. An LR clock signal and a bit clock signal are transmitted to the LR clock line 45 and the bit clock line 46, respectively.

  The navigation voice signal on the Lch signal line 23l is a voltage that fluctuates up and down with respect to the reference voltage, as schematically shown in the frame of the analog region 33. The navigation control signal in the Rch signal line 23r associates each control content with a voltage level within a range between the + side maximum amplitude and the − side maximum amplitude with the reference voltage as the center. The reference voltage is typically +2.5 V (reference voltage), and, for example, + side maximum amplitude = + 5 V and −side maximum amplitude = 0 V (GND voltage).

  FIG. 3 is a timing chart of the LR clock signal of the LR clock line 41 and the data signal of the data line 25 in FIG. The LR clock signal is used by the DSP 11 to control the transmission channel of the audio signal that the A / D converter 24 sends to the data line 25 in a time division manner. The LR clock signal indicates the left channel. During the period, the navigation voice assigned to the left channel is sent from the A / D converter 24 to the data line 25. During the period when the LR clock signal indicates the right channel, the navigation control signal assigned to the right channel is sent from the A / D converter 24 to the data line 25.

  By varying the voltage level of the control signal output from the car navigation device 14 to the A / D converter 24 (hereinafter, the voltage level is appropriately represented by α), any control content is associated with α. Can be transmitted to the DSP 11.

  A first control signal mode that associates the voltage level α with each control content will be described. For convenience of explanation, it is assumed that the audio signal input from the audio source 13 to the DSP 11 via the A / D converter 18 relates to a typical music reproduction sound. In practice, the audio source 13 is not limited to a music player such as a CD player, but may be a tuner or the like. An audio signal input from the audio source 13 to the DSP 11 via the A / D converter 18 is Needless to say, the present invention is not limited to the music playback sound, and there are other programs such as program sounds of the left and right channels of FM broadcasting.

  In the first control signal mode, when the car navigation device 14 requests the DSP 11 to output the navigation sound, α is set to an arbitrary amplitude (voltage) on the + side, and does not request the output of the navigation sound. In this case, α is set to a GND voltage as a reference voltage.

  In response to this, when the α = GND voltage, the DSP 11 assigns audio signals related to the music reproduction sound to the slots for the left and right channels of the data line 27, respectively. As a result, left and right music playback sounds are output from the left and right speakers.

  The DSP 11 assigns the navigation sound to the slot for the left channel of the data line 27 on the output side and the audio signal related to the music reproduction sound of the right channel to the slot for the right channel when α is the + side amplitude. As a result, the navigation sound and the right channel music playback sound are output from the left and right speakers. The DSP 11 sends to the D / A converter 28 so that the output from the right speaker is silenced instead of the music playback sound of the right channel or the same navigation sound is output from the left and right speakers. Control audio signals.

  In order to prevent malfunction due to noise, a threshold voltage R that is slightly higher than the noise voltage is set without strictly outputting the music playback sound when α = GND voltage, and the DSP 11 satisfies α ≦ GND voltage + R. In this case, the control signal is defined so that the music playback sound of the left and right channels is output from the left and right speakers, and the output from the speaker is switched from the music playback sound to the navigation sound when α> GND voltage + R. You can also.

  In the description of the first control signal mode, the audio signal and the control signal related to the navigation voice are transmitted through the Lch and Rch signal lines 23l and 23r, respectively. On the contrary, the audio signal and the control signal related to the navigation voice are respectively transmitted. It may be transmitted through the Rch and Lch signal lines 23r and 23l. Further, when α is a negative amplitude, music playback sound may be played from the left and right speakers, and when α = GND voltage, navigation sound may be output from the speaker instead of the music playback sound.

  FIG. 4 shows the relationship between the voltage level α of the navigation control signal and the speaker output in the second control signal mode. In FIG. 4 and FIG. 5 described later, the navigation control signal input for A / D conversion means the voltage level α of the control signal, and Lch (left channel) and Rch (right channel) in the output channel are left speakers. And the type of audio output from the right speaker. In the second control signal mode, the reference voltage is, for example, +2.5 V (reference voltage) when the AD conversion input is 5 V.

  In the second control signal mode, α is higher than the reference voltage + side amplitude (first row in the table of FIG. 4), level equal to the reference voltage (third row of the table in FIG. 4), and lower than the reference voltage. -It is divided into three sections of side amplitude (second row in the table of FIG. 4), and the DSP 11 performs output sound control corresponding to each section.

  When α = reference voltage, the DSP 11 assigns and outputs the processed left and right channel audio signals from the Lch and Rch signal lines 17l and 17r to the left and right channel slots of the data line 27, respectively. As a result, the music reproduction sound of the left and right channels is output from the left and right speakers.

  In order to prevent malfunction due to noise, instead of setting α = reference voltage, an appropriate positive value γ is set, and α is a reference such that reference voltage−γ <α <reference voltage + γ. When the voltage is within a predetermined range centered on the voltage, it is advantageous to perform the same control as α = reference voltage.

  When the α is on the + side amplitude (α> reference voltage), typically α = the maximum amplitude on the DSP 11, the DSP 11 displays the navigation sound and the right channel music playback sound in the left and right channel slots of the data line 27, respectively. An audio signal related to is assigned and output. As a result, navigation sound and right channel music playback sound are output from the left and right speakers, respectively.

  When the α is −side amplitude (α <reference voltage), typically α = −side maximum amplitude, the DSP 11 sets the left channel music playback sound and navigation sound to the left and right channel slots of the data line 27, respectively. An audio signal related to is assigned and output. As a result, the left channel music playback sound and the navigation sound are output from the left and right speakers, respectively.

  In the second control signal mode, the navigation sound is caused to flow from the left speaker when α> reference voltage, in order to cope with the left-hand drive vehicle, and the navigation sound is caused to flow from the right speaker as α <reference voltage. This is to deal with right-hand drive vehicles. The user determines in advance in the car navigation device 14 whether the output speaker of the navigation sound is to be the left or right speaker in the own vehicle.

  FIG. 5 shows the relationship between the voltage level α of the control signal and the speaker output in the third control signal mode. In the third control signal mode, α is divided into a total of seven sections, and the output audio from the left and right speakers is controlled according to which section α is in, and in the speaker that outputs the navigation sound. The volume ratio between the navigation sound and the music playback sound of the interrupted sound is adjusted.

In the table of FIG. 5, α is divided into a total of seven ranges as follows. Note that α = reference voltage in the table of FIG. 5 means that α is in the range between the third division and the fifth division, that is, reference voltage−1V ≦ α ≦ reference voltage + 1V.
First classification: reference voltage + 2V <α ≦ reference voltage + 2.5V
Second category: reference voltage +1.5 V <α ≦ reference voltage +2 V
Third category: reference voltage + 1V <α ≦ reference voltage + 1.5V
Fourth division: α = reference voltage (reference voltage)
Fifth division: reference voltage -1.5V ≦ α <reference voltage-1V
Sixth classification: reference voltage -2V ≦ α <reference voltage -1.5V
Seventh division: reference voltage −2.5 V ≦ α <reference voltage −2 V

  In the first to third classifications, the synthesized sound of the navigation sound and the music reproduction sound of the left channel is output from the left speaker, and the music reproduction sound of the right channel is output alone from the right speaker. The volume ratio between the navigation sound from the left speaker and the music playback sound of the left channel is 100: 0 in the first category, 80:20 in the second category, and 40:60 in the third category.

  In the fifth to eighth sections, the left channel music reproduction sound is output alone from the left speaker, and the synthesized sound of the navigation sound and the right channel music reproduction sound is output from the right speaker. The volume ratio between the navigation voice from the right speaker and the music playback sound of the right channel is 40:60 in the fifth category, 80:20 in the sixth category, and 100: 0 in the seventh category.

  In the fourth category, the music playback sounds of the left and right channels are individually output from the left and right speakers, respectively.

  FIG. 6 is a configuration diagram of the audio processing device 55. The on-vehicle audio processing device 10 described above is a specific example of the audio processing device 55. The audio processing device 55 includes at least first and second data lines 56 and 57 and a DSP 58. Preferably, the audio processing device 55 includes an A / D converter 63. The first and second audio sources 60 and 61 and the speakers 62a and 62b may be any of internal components and external components of the audio processing device 55.

  The first data line 56 transmits a plurality of channels of audio signals from the first audio source 60. The second data line 57 transmits the monaural audio signal and control signal from the second audio source 61 in a time division manner. The DSP 58 controls the relationship between each audio signal input from the first and second data lines 56 and 57 and each output audio signal to the speakers 62a and 62b corresponding to each channel based on the control signal.

  The first audio source 60 is, for example, a CD player, an MD player, a tuner, or a portable HD audio player. The second audio source 61 is, for example, a car navigation device, a hands-free telephone, or an interphone. The monaural audio signal is, for example, a guidance voice of a car navigation device, a ringing tone on a hands-free telephone, a talking voice of a call partner, an interphone ringing tone, or a talking voice of a visitor.

  The audio processing device 55 is not limited to a vehicle-mounted audio processing device. The audio processing device 55 may be an audio processing device deployed at home. The above-described hands-free telephone may be either a mobile phone or a fixed phone.

  The multi-channel audio signals from the first audio source 60 are typically left and right channel audio signals, but may be audio signals of three or more channels. When the audio signal from the first audio source 60 has three or more channels, there are three or more speakers accordingly. The audio signal of each channel on the first data line 56 is typically flowed in a time division manner to a single data line, but may be a dedicated data line for each channel.

  The sounds related to the audio signal of the predetermined channel of the first audio source 60 and the monaural audio signal of the second audio source 61 are defined as interrupted sound and interrupted sound, respectively. Preferably, the control signal includes an interruption period of the interrupt sound, designation of the speakers 62a and 62b that output the interrupt sound, a volume ratio between the interrupted sound and the interrupt sound in the speakers 62a and 62b that output the interrupt sound, and / or an interrupt. This is a control signal related to the volume of the interrupt sound in the speakers 62a and 62b that output the sound alone.

  The A / D converter 63 inputs analog audio signals and control signals from the second audio source 61 to separate input terminals, and A / D-converts these analog inputs in a time-sharing manner to obtain a digital format. The audio signal and the control signal are output to the second data line 57 in a time division manner. A specific example of the A / D converter 63 is the A / D converter 24 (FIG. 1).

  As shown in FIGS. 4 and 5, for example, the control signal represents various control instructions to the DSP 11 by the difference in voltage level.

  Thus, the audio processing device 55 can prevent the control delay of the DSP 58 by sending the control signal of the second audio source 61 in synchronization with the interrupt sound to the DSP 58 in a time division manner. In addition, since the control signal from the second audio source 61 to the DSP 58 is sent using a channel in which the interrupt sound is free for monaural, it is possible to refrain from using the GP58 of the DSP 58. it can.

  FIG. 7 is a flowchart of the audio processing method 66. The audio processing method 66 is applied to the audio processing device 55. In S 67, a plurality of channels of audio signals are transmitted from the first audio source 60 to the DSP 58 via the first data line 56. In S68, the monaural audio signal and the control signal are transmitted from the second audio source 61 to the DSP 58 via the second data line 57 in a time division manner.

  In S69, the input / output relationship between the audio signal input to the DSP 58 from the first and second data lines 56 and 57 and the audio signal output from the DSP 58 to the speakers 62a and 62b corresponding to each channel is input to the DSP 58. Control based on the signal.

  As in the case of the audio processing device 55, also in the audio processing method 66, the control signal includes, for example, the interrupt period of the interrupt sound, the designation of the speaker that outputs the interrupt sound, and the interrupted sound and interrupt in the speaker that outputs the interrupt sound. It is a control signal related to the volume ratio of the sound and / or the volume of the interrupt sound in the speaker that outputs the interrupt sound alone.

  Also in the audio processing method 66, the control signal typically represents various control instructions to the DSP 58 by voltage level differences.

  The audio signal and the control signal on the second data line 57 in S68 are, for example, the A / D converter 63 in which the analog audio signal and the control signal are respectively input from the second audio source to different input terminals. A / D conversion is performed by division, and the data is output to the second data line by time division.

  Although the present invention has been described with respect to various specific embodiments, the present invention is not limited to this, and each component in the various specific embodiments is modified (including deletion) without departing from the gist of the invention. And can be materialized. Various inventions can also be formed by replacing constituent elements between various specific forms or combining a plurality of constituent elements in various specific forms.

It is a schematic block diagram of a vehicle-mounted audio processing apparatus. It is a block diagram of the principal part of a vehicle-mounted audio processing apparatus. 3 is a timing chart of the LR clock signal of the LR clock line and the data signal of the data line in FIG. 2. It is a figure which shows the relationship between the voltage level of the navigation control signal in a 2nd control signal aspect, and a speaker output. It is a figure which shows the relationship between the voltage level of the control signal and speaker output in a 3rd control signal aspect.

It is a block diagram of an audio processing device. It is a flowchart of an audio processing method. It is a block diagram of the conventional vehicle-mounted audio processing apparatus. FIG. 9 is a timing chart of signals related to the data line in FIG. 8. It is a block diagram of another conventional vehicle-mounted audio processing apparatus.

Explanation of symbols

55: Audio processing device, 56: First data line, 57: Second data line, 58: DSP, 60: First audio source, 61: Second audio source, 62a, 62b: Speaker, 63: A / D converter 66: Audio processing method.

Claims (6)

A first data line for transmitting a plurality of channels of audio signals from a first audio source by time division multiplexing;
Of the monaural audio signal from the second audio source and the control signal, the monaural audio signal is transmitted on one channel of time division multiplexing, and the control signal is transmitted on the other channel of time division multiplexing. A data line, and the first and second data lines are connected to separate first and second audio signal input terminals, and each channel signal input from the first audio signal input terminal The signal of one channel input from the second audio signal input terminal is processed as an input audio signal, the signal of the other channel input from the second audio signal input terminal is processed as a control signal, The relationship between each input audio signal and the output audio signal to the speaker corresponding to each channel is represented by the second input terminal. A DSP for controlling based on an amplitude section to which an amplitude value belongs when the control signal input from the second data line connected to the analog signal state before digital conversion belongs ,
An audio processing apparatus comprising: Sounds related to a predetermined channel audio signal of the first audio source and a monaural audio signal of the second audio source are defined as interrupted sound and interrupt sound, respectively.
The control signal is
Interrupt period of interrupt sound,
Designation of a speaker for outputting the interrupt sound;
A volume ratio between an interrupted sound and an interrupt sound in a speaker that outputs an interrupt sound, and / or a volume of the interrupt sound in a speaker that outputs the interrupt sound alone;
The audio processing apparatus according to claim 1, wherein the control signal is a control signal according to claim 1. The analog audio signal and the control signal from the second audio source are respectively input to different input terminals and A / D converted in a time division manner, and the digital audio signal and the control signal are converted into the second data in a time division manner. A / D converter that outputs to the line,
The audio processing apparatus according to claim 1, further comprising:   The audio processing apparatus according to claim 1, wherein the second audio source is a car navigation apparatus, a hands-free telephone, or an interphone.   5. The audio processing apparatus according to claim 1, wherein the control signal represents various control instructions to the DSP by a difference in voltage level. Transmitting a plurality of channels of audio signals from the first audio source to the DSP via the first data line by time division multiplexing;
Out of the monaural audio signal and the control signal from the second audio source to the DSP via the second data line, the monaural audio signal is transmitted through one channel of time division multiplexing, and the control signal is time division multiplexed. Transmitting in the other channel; and in a DSP in which the first and second data lines are connected to separate first and second audio signal input terminals, input from the first audio signal input terminal The signal of each channel to be processed and the signal of one channel input from the second audio signal input terminal are processed as an input audio signal, and the signal of the other channel input from the second audio signal input terminal It is processed as a control signal, the output audio to the speaker for each input audio signals and the channels The relationship between the signal based on the amplitude segment amplitude value belongs when the second of said control signal inputted from said second data lines connected to the input terminal is an analog signal state before digital conversion Step to control,
An audio processing method comprising:

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