JP6659949B2 - Audio processing device - Google Patents

Description

  The present invention relates to an audio processing device that performs audio processing such as amplification on an audio signal.

  As an audio processing device that performs audio processing such as amplification on an audio signal, there is an AV receiver having an ARC (Audio Return Channel) function of outputting an audio signal input from a television to a speaker (for example, see Patent Document 1). The TV and the AV receiver are connected by an HDMI (registered trademark) cable. Also, a digital audio signal is input from the television to the AV receiver via an HDMI (registered trademark) cable. The AV receiver D / A converts a digital audio signal into an analog audio signal and outputs the analog audio signal to a speaker.

JP 2011-199693 A

  Here, if a problem occurs in the AV receiver even though the digital audio signal is normally output from the television to the AV receiver, there is a problem that audio is not output from the speaker.

  An object of the present invention is to solve the problem that no sound is output from a speaker in a sound processing device having an ARC function of outputting a sound signal input from a television to a speaker.

  An audio processing device according to a first aspect of the present invention is an audio processing device having an ARC function of outputting an audio signal input from a television to a speaker, the audio processing device conforming to a standard for transferring between devices input from the television. A conversion unit for converting one digital audio signal into a second digital audio signal according to a standard for serial transfer, a signal processing unit for performing digital signal processing on the second digital audio signal, and a control unit If it is determined that the speaker is in an abnormal state in which no sound is output from the speaker, a command for turning off the ARC function is transmitted to the television, and the power supply line connected to the television is set to low level, and then to high level. And transmitting an ARC function ON command to the television.

  In the present invention, when the control unit determines that the speaker is in an abnormal state in which no sound is output from the speaker, the control unit transmits an ARC function OFF command to the television, and sets the power supply line connected to the television to a low level. Thereafter, the level is set to the high level, and the command for turning on the ARC function is transmitted to the television. As a result, the television determines that the audio processing device has been reconnected, and temporarily stops the output of the digital audio signal and then restarts. Therefore, the signal processing unit relocks the second digital audio signal. The signal processing unit is likely to be able to lock the second digital audio signal by re-locking, and if the signal processing unit locks the second digital audio signal, sound is normally output from the speaker. As described above, according to the present invention, it is possible to solve the problem that no sound is output from the speaker due to the problem of the sound processing device.

  The audio processing device according to a second aspect of the present invention is the audio processing device according to the first aspect, wherein the control unit communicates with the television according to a predetermined standard, and the internal state of the own device executes the ARC function. A state in which the conversion unit locks the first digital audio signal and the signal processing unit does not lock the second digital audio signal for a predetermined period of time, It is characterized in that it is determined to be in a state.

  A sound processing device according to a third invention is the sound processing device according to the second invention, wherein the predetermined standard is a CEC standard.

  According to a fourth aspect of the present invention, in the audio processing device according to any one of the first to third aspects, the first digital audio signal is an SPDIF signal.

  According to a fifth aspect of the present invention, in the audio processing device according to any one of the first to fourth aspects, the second digital audio signal is an I2S signal.

  According to the present invention, it is possible to solve the problem that no sound is output from the speaker due to the problem of the sound processing device.

FIG. 1 is a block diagram illustrating a configuration of an AV receiver according to an embodiment of the present invention. 5 is a flowchart illustrating an operation of the AV receiver when no sound is output from the speaker.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a block diagram illustrating a configuration of the AV receiver according to the present embodiment. The AV receiver 1 (audio processing device) is connected to the television 100 by an HDMI (registered trademark) cable. The AV receiver 1 has an ARC (Audio Return Channel) function of outputting an audio signal input from the television 100 to the speaker 200. The AV receiver 1 has a function of performing communication in accordance with the CEC (Consumer Electronics Control) standard.

  As shown in FIG. 1, the AV receiver 1 includes a control unit 2, a storage unit 3, a display unit 4, an operation unit 5, a digital signal input terminal 6, a DIR (Digital Audio Interface Receiver) 7, and a DSP (Digital Signal Processor) 8. , A D / A converter (hereinafter, referred to as “DAC”) 9, a volume adjustment unit 10, an amplification unit 11, and a speaker terminal 12.

  The control unit 2 controls each unit constituting the AV receiver 1 according to a program stored in the storage unit 3. The storage unit 3 includes a RAM (Random Access Memory) that functions as a main memory of the control unit 2 and a ROM (Read Only Memory) that stores a program. Note that the storage unit 3 is not limited to the illustrated configuration, and may include a flash memory, a hard disk drive (HDD), and the like.

  The display unit 4 displays a setting screen or the like, and is an LCD (liquid crystal display), a fluorescent display tube, or the like. The operation unit 5 is for receiving a user operation, and is an operation button or a remote controller provided on the housing of the AV receiver 1. By operating the operation unit 5, the user can specify, for example, the volume value of the audio signal.

  The television 100 is connected to the digital signal input terminal 6 via an HDMI (registered trademark) cable. An SPDIF signal is input from the television 100 to the digital signal input terminal 6. The DIR 7 (converter) converts an SPDIF signal (first digital audio signal) input from the television 100 into an I2S signal (second digital audio signal). The converted I2S signal is output to the DSP 8. The DSP 8 (signal processing unit) performs digital signal processing such as equalizer processing on the I2S signal. The digital signal processed I2S signal is output to the DAC 9. The DAC 9 performs D / A conversion of the I2S signal into an analog audio signal. The D / A converted analog audio signal is output to the volume adjustment unit 10.

  The volume adjustment unit 10 adjusts a volume value of the analog audio signal. The analog audio signal whose volume value has been adjusted is output to the amplifier 11. The amplifier 11 amplifies the analog audio signal whose volume value has been adjusted. The amplified analog audio signal is output to the speaker terminal 12. A speaker 200 is connected to the speaker terminal 12. The speaker 200 outputs sound based on the analog sound signal.

Hereinafter, the operation of the AV receiver 1 when no sound is output from the speaker 200 will be described. When all of the following conditions are satisfied, the control unit 2 determines that the speaker 200 is in an abnormal state in which no sound is output.
1. CEC communication (exchange of commands related to the ARC function) with the television 100 is normally performed.
2. The internal state of the AV receiver 1 is a state in which the ARC function is executed, the DIR 7 locks the SPDIF signal, and the DSP 8 does not lock the I2S signal.
3.2 The state of 2 has continued for a predetermined time.

When the control unit 2 determines that the state is abnormal, the control unit 2 executes the following processing.
1. A CEC command for turning off the ARC function is transmitted to the television 100.
2. After the power supply line (5 V) connected to the television 100 is set to low level, it is set to high level.
3. A CEC command for turning on the ARC function is transmitted to the television 100.

  Through the processes 1 to 3, the television 100 determines that the AV receiver 1 has been connected again, temporarily stops the output of the digital audio signal, and restarts the output of the digital audio signal.

  FIG. 2 is a flowchart showing the operation of the AV receiver 1 when no sound is output from the speaker 200. First, the control unit 2 determines whether or not the internal state of the AV receiver 1 is a state for executing the ARC function (S1). When the control unit 2 determines that the internal state of the AV receiver 1 is a state in which the ARC function is executed (S1: Yes), the control unit 2 determines whether the DIR 7 locks the SPDIF signal (S2). While the DIR 7 determines that the SPDIF signal is not locked (S2: No), the control unit 2 repeatedly executes the process of S2.

  When the control unit 2 determines that the DIR 7 locks the SPDIF signal (S2: Yes), the control unit 2 determines whether the DSP 8 locks the I2S signal (S3). When the control unit 2 determines that the DSP 8 has not locked the I2S signal (S3: No), the control unit 2 determines whether a timer for monitoring an abnormal state has been activated (S4). When the control unit 2 determines that the abnormal state monitoring timer has not been started (S4: No), it starts the abnormal state monitoring timer (S5). The timer for monitoring an abnormal state is, for example, a timer that times out in 10 seconds.

  When the control unit 2 determines that the timer for monitoring the abnormal state is activated (S4: Yes), or determines whether the timer for monitoring the abnormal state has timed out after the process of S5 ( S6). While determining that the timer for monitoring an abnormal state has not timed out (S6: No), the control unit 2 repeatedly executes the processing of S6. When determining that the timer for monitoring the abnormal state has timed out (S6: Yes), the control unit 2 transmits a CEC command to turn off the ARC function to the television 100 (S7). Next, the control unit 2 sets the power supply line connected to the television 100 to a low level and then to a high level (S8). Next, the control unit 2 transmits a CEC command to turn on the ARC function to the television 100 (S9).

  When the control unit 2 determines that the internal state of the AV receiver 1 is not a state in which the ARC function is executed (S1: No), when the DSP 8 determines that the I2S signal is locked (S3: Yes), The process ends.

  As described above, in the present embodiment, when the control unit 2 determines that an abnormal state where sound is not output from the speaker 200, the control unit 2 transmits a CEC command to turn off the ARC function to the television 100, and After the power supply line connected to is turned to a low level, the power supply line is turned to a high level, and an ARC function ON command is transmitted to the television. As a result, the television 100 determines that the AV receiver 1 has been reconnected, restarts the digital audio signal after temporarily stopping the output. Therefore, the DSP 8 re-locks the I2S signal. The DSP 8 is likely to be able to lock the I2S signal by re-locking. If the DSP 8 locks the I2S signal, sound is normally output from the speaker 200. As described above, according to the present embodiment, it is possible to solve the problem that no sound is output from the speaker 200 due to the problem of the AV receiver 1.

  As described above, the embodiment of the present invention has been described, but the form to which the present invention can be applied is not limited to the above-described embodiment, and may be appropriately set within the scope of the present invention as illustrated below. It is possible to make changes.

  In the above-described embodiment, an AV receiver has been exemplified as the audio processing device. The present invention is not limited to this, and may be another audio processing device.

  INDUSTRIAL APPLICATION This invention can be employ | adopted suitably for the audio | voice processing apparatus which performs audio | voice processing, such as amplification, on an audio signal.

1 AV receiver (audio processing device)
2 Control unit 7 DIR (Conversion unit)
8 DSP (signal processing unit)
100 TV 200 Speaker

Claims (1)

An audio processing device having an ARC function of outputting an audio signal input from a television to a speaker,
A conversion unit that converts an SPDIF signal according to a standard for transferring between devices input from the television into an I2S signal according to a standard for serial transfer;
A signal processing unit that performs digital signal processing on the I2S signal;
And a control unit,
The control unit includes:
Communication with the television according to the CEC standard,
The internal state of the own device is a state in which the ARC function is executed,
When a state in which the conversion unit locks the SPDIF signal and the signal processing unit does not lock the I2S signal continues for a predetermined time , transmits an ARC function off command to the television, An audio processing apparatus, wherein a power supply line connected to the television is set to a low level and then to a high level, and an ARC function ON command is transmitted to the television.

Images