WO2005096512A1 - 音声信号処理装置 - Google Patents
音声信号処理装置 Download PDFInfo
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- WO2005096512A1 WO2005096512A1 PCT/JP2005/005949 JP2005005949W WO2005096512A1 WO 2005096512 A1 WO2005096512 A1 WO 2005096512A1 JP 2005005949 W JP2005005949 W JP 2005005949W WO 2005096512 A1 WO2005096512 A1 WO 2005096512A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Definitions
- the present invention relates to, for example, an audio signal processing device for processing an audio signal received via a digital transmission system.
- audio, video, various data, and the like are compressed and encoded, subjected to processing such as error correction encoding and interleaving, and modulated by OFDM modulation and the like to perform multiplex transmission. It is possible to demodulate into high-quality audio, video, various data, and the like on the receiving device side.
- the receiving state of the receiving apparatus depends on a change in the environment of the digital transmission path.
- the receiving apparatus may be deteriorated by the influence of fading or the like. It is important to effectively remove the effects of changes in the transmission line environment.
- the broadcast receiving apparatus disclosed in Japanese Patent Application Laid-Open No. 2002-300061 detects the reception state of an incoming broadcast wave based on a bit error rate (BER) obtained in demodulation processing, and performs fading. For example, when the state of good reception is poor, the output level of the received audio signal is reduced to the mute level, and when the state of reception is restored again, the output level is gradually reduced to the original level. By returning the noise, the noise mixed into the audio signal due to fading or the like is reduced, and the uncomfortable feeling given to the user is reduced.
- BER bit error rate
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-300061 Disclosure of the invention
- the above-mentioned conventional broadcast receiving apparatus detects whether the reception state is good or bad based on only the bit error rate, and reduces the noise component in the audio signal only by performing mute control based on the detection result. To do it.
- the present invention has been made in view of such conventional problems, and makes it possible to perform higher quality audio reproduction based on an audio signal received via a digital transmission system.
- An object is to provide an audio signal processing device.
- the invention according to claim 1 is an audio signal processing device that processes an audio signal output from a receiving unit that receives a signal transmitted via a digital transmission path, wherein the audio signal is processed.
- the content of the signal processing is determined by using a plurality of pieces of information indicating the internal state of the receiving means and a plurality of pieces of information indicating the internal state of the receiving means.
- the invention according to claim 13 is an audio signal processing method for processing an audio signal output from a receiving unit that receives a signal transmitted via a digital transmission path, wherein the internal unit of the receiving unit is A receiving state determining step of determining a receiving state using a plurality of information indicating a state; a processing content setting step of setting processing contents of the audio signal based on a result of the determination by the receiving state determining step; A signal processing step of processing the audio signal based on the processing content set in the processing content setting step.
- the invention according to claim 14 is a computer program that causes a computer that processes an audio signal output from a receiving unit that receives a signal transmitted via a digital transmission line to execute the audio signal, wherein the receiving unit Receiving state determining step of determining the receiving state using a plurality of pieces of information indicating the internal state of the receiver, and based on the determination result of the receiving state determining step.
- a recording medium according to claim 15 is characterized in that the computer program according to claim 14 is recorded thereon.
- FIG. 1 is a diagram showing a configuration and functions of an audio signal processing device according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a configuration of an audio signal processing device according to an embodiment.
- FIG. 3 is a diagram illustrating a configuration and functions of an audio signal amount detection unit 6c provided in a decoder unit.
- FIG. 4 is a block diagram showing a configuration of an audio processing unit provided in the audio signal processing device shown in FIG. 2.
- FIG. 5 is a block diagram showing a configuration of a control unit provided in the audio signal processing device shown in FIG. 2.
- FIG. 6 is a diagram for explaining functions of a reception state bad period detecting section and a reception state bad interval detecting section shown in FIG. 5;
- FIG. 7 is a diagram schematically showing control data stored in a table shown in FIG. 5
- FIG. 8 is a flowchart for explaining the operation of the audio signal processing device shown in FIG. 2
- FIG. 9 is a flowchart for explaining the operation of the audio signal processing device shown in FIG. 2.
- FIG. 1A is a block diagram showing a configuration of the audio signal processing device
- FIG. 1B is a functional block diagram showing functions of the audio signal processing device.
- the audio signal processing device 1 includes an audio processing unit 2 and a control unit 3.
- the audio processing unit 2 receives a multiplexed signal transmitted via a digital transmission line such as a digital radio broadcast, a digital television broadcast, or the Internet under the control of the control unit 3. Rx force The output audio signal Sau is processed.
- the receiving unit Rx Upon receiving the above-mentioned digital radio broadcast or the like, the receiving unit Rx amplifies the multiplexed received signal Srx by high-frequency amplification and frequency conversion, further demodulates the frequency-converted signal, and performs information separation and decoding. By performing such decoding processing, the original audio signal Sau or the like before being modulated and multiplexed at the broadcast station or the like is returned to the signal processing unit 2 and output. Further, the receiving unit Rx adjusts the operation timing of the receiving unit Rx and the signal processing unit 2 by temporarily buffering the generated audio signal Sau in a buffer memory or the like (not shown) and outputting the buffered signal. It has become.
- the control unit 3 detects the internal state of the receiving unit Rx, determines the receiving state based on the detection result, and further determines and determines the processing content of the audio processing unit 2 based on the determination result.
- the audio processing unit 2 is controlled according to the processing content.
- control unit 3 includes a reception state determination unit 3a and a processing content determination unit 3b.
- the reception state determination unit 3a generates an AGC voltage, a bit error rate (BER), a CZN value, a CRC determination result based on a CRC (Cyclic Redundancy Check) generated when the reception unit Rx performs AGC control,
- the plurality of parameters such as the RS determination result by the Reed-Solomon error determination process, are input as an internal state signal Ddet indicating the internal state of the receiving unit Rx, and based on the plurality of parameters, the reception electric field strength is reduced and Judgment is made for each reception state, such as a reception state without multipath fading or the like, a stable reception state, a reception state affected by multipath fading or the like, and a weak electric field reception state in which the received electric field strength is reduced.
- the processing content determination unit 3b determines whether or not the audio signal Sau buffered in the above-described buffer memory or the like by the reception unit Rx is to be buffered during a predetermined period when the reception state is good.
- the change of the quantity is included in the internal state signal Ddet and input.
- audio signal amount based on the amount of the audio signal when the reception state is good (hereinafter referred to as “audio signal amount”), a change in the reception state in a predetermined period is analyzed, and the analysis result and the reception state determination unit 3a are analyzed.
- the letter of receipt determined by The content to be processed by the audio processing unit 2 is determined according to the state, and a control signal Sent for operating the processing content determination unit 3b is output according to the determined processing content.
- the audio processing unit 2 performs a process on the audio signal Sau in accordance with an instruction of the control signal Sent supplied from the control unit 3, and performs audio reproduction on a speaker (not shown) according to a reception state. Generates and outputs audio signal Scmp for reproducing high quality sound.
- the audio processing unit 2 has a function of performing various types of processing on the audio signal Sau in accordance with the control signal Sent output from the processing content determination unit 3b shown in FIG. 1 (b).
- a data hold control function that interpolates signal components missing in the audio signal Sau by repeating the audio signal Sau for a predetermined period, and interpolation data that interpolates signal components missing in the audio signal Sau Insertion control function, dummy data insertion control function to insert a dummy data component to reproduce sound that is not harsh when sound is reproduced by the speaker, into the audio signal Sau, frequency characteristic to adjust frequency characteristics by variable filter Control function, ATT amount control function to adjust the amount of attenuation by the attenuator, mute-on control function to cut off the output of the audio signal Sau, if the audio signal Sau is of high quality It has a no-operation control function that does not perform processing in such a case. Then, each control function is performed according to the instruction of the control signal Sent from the control unit 3, and the audio signal Sau is processed to generate
- the reception state is detected based on a plurality of internal states in the reception unit Rx, so that the reception state can be accurately determined.
- the reception state is degraded by performing processing to reproduce high-quality sound with a speaker or the like on the audio signal Sau for which the reception unit Rx power is also output according to the determined reception state. Even in this case, the sound can be reproduced with a speaker or the like without giving the user a feeling of strangeness.
- reception state determination unit 3a and the processing content determination unit 3b shown in FIG. 1B may be formed by a look-up table format storage unit, or the control unit 3 may be a microprocessor (MPU).
- the microprocessor may be formed by a circuit having an operation and determination function such as the above, and the microprocessor may determine the reception state and determine the processing content.
- FIG. 2 is a block diagram showing the configuration of the audio signal processing apparatus according to the present embodiment, in which the same or corresponding parts as those in FIG. 1A are denoted by the same reference numerals.
- the audio signal processing device 1 includes an audio processing unit 2 and a control unit 3, and the audio processing unit 2 performs digital radio broadcasting or
- the audio signal Sau output from the receiving unit Rx that receives the multiplexed signal transmitted via digital television broadcasting, the Internet, etc., is signal-processed, and each speaker 13 forming the multi-channel speaker system is processed. Generates and outputs audio signal Scmp for driving.
- the receiving unit Rx includes a front end unit 4, a demodulating unit 5, a decoding unit 6, a local oscillator 7, an AGC unit 8, and the like to which a receiving antenna ANT is connected.
- the front end unit 4 generates a modulated signal of an intermediate frequency by amplifying the reception signal Srx generated in the reception antenna ANT at a high frequency and mixing the local oscillation signal supplied from the local oscillation unit 7, Further, the modulated signal is amplified and subjected to AZD conversion to output a modulated signal Sa composed of a digital data string.
- the AGC unit 8 automatically adjusts the amplification factor when the front end unit 4 amplifies the above-mentioned intermediate frequency modulated signal. That is, the AGC unit 8 adjusts the AGC voltage based on a bit error rate (BER) described later detected by the demodulation unit 5 and supplies the AGC voltage to the front end unit 4 to automatically adjust the amplification factor. . Further, the AGC unit 8 supplies an internal state signal Ddetl indicating the AGC voltage to the control unit 3.
- BER bit error rate
- the demodulation unit 5 generates and outputs a demodulated signal Sb by performing error correction processing on the modulated signal Sa and performing demodulation processing.
- the demodulation unit 5 performs bit error rate (BER), CZN value, CR
- An internal state signal Ddet2 indicating each parameter such as a C determination result, an RS determination result by the Reed-Solomon error determination process, and an audio signal amount is supplied to the control unit 3.
- the decoding unit 6 separates information such as audio signals, video signals, and various data that are compression-encoded and multiplexed into the demodulated signal Sb for each information, and further separates the separated audio signals and video. By subjecting signals, various data, etc. to decompression processing, it is returned to the original audio signal Sau, video signal Svd, various data, etc. before modulation and multiplexing etc. are performed at the broadcasting station etc. and output .
- the video processing unit 9 Based on the video signal Svd output from the decoding unit 6, the video processing unit 9 generates a composite signal or the like, and the video reproduction unit 10 controls the driving of the display unit 4 based on the composite signal or the like. By doing so, the video transmitted by the broadcasting station or the like is displayed.
- the audio processing unit 2 performs signal processing described later on the audio signal Sau output from the decoding unit 6, thereby generating an audio signal Scmp corrected in accordance with the reception state.
- the sound signal Scmp is DZA-converted and power-amplified and supplied to the speaker 13 so that the sound such as music transmitted from a broadcasting station or the like is reproduced.
- the decoding unit 6 has a video memory 6a as a buffer memory that buffers the video signal Svd and the audio signal Sau, adjusts the timing, and outputs it to the video processing unit 9 and the signal processing unit 2 side. And a voice memory 6b, and among the voice signals Sau buffered in the voice memory 6b, a change in the amount of voice signal when the reception state is good is detected, and the detected voice signal amount is stored in the internal state.
- An audio signal amount detection unit 6c that outputs a signal Ddet3 is provided.
- FIG. 3A is a block diagram showing a configuration of the audio signal amount detection unit 6c
- FIG. 3B is a diagram for explaining a function of the audio signal amount detection unit 6c.
- the audio signal amount detection unit 6c includes a determination unit 6ca, a counter 6cb, and a shift register 6cc.
- the audio memory 6b having a predetermined storage capacity performs the so-called FIFO processing while executing the audio signals Sau (l), Sau (2) to Sau (2). N).
- the determination unit 6ca performs a so-called FIFO process while performing the so-called FIFO processing on each of the audio signals Sau (l) and Sau (2) to Sau (N) in the audio memory 6b.
- Bit error rate BER (l), BER (2) ⁇ : BER (N) is sequentially buffered, and each bit error rate BER (l), BER (2) ⁇ BER (N) is determined by a predetermined judgment reference value.
- the determination unit 6ca determines if the bit error rate is better than a predetermined determination reference value.
- a determination result of logic “H” is output, and when the bit error rate is inferior to a predetermined determination reference value, the reception state is determined. Judges that it is not good, and outputs the judgment result of logic "L”.
- the counter 6cb outputs the judgment result [UG (1), JUG (2) to JUG (N) of the logic “ by counting a determination result of the H ", a total indicating the audio signal Sau (l), Sau (2 ) ⁇ S aU number of reception is good voice signal of (N) (i.e., audio signal amount) Output the numerical value ⁇ ⁇ .
- the shift register 6cc inputs the count value ⁇ i output from the counter 6cb, and counts a predetermined number m of count values ⁇ 1 to While updating ⁇ m, it outputs m count values ⁇ 1 to ⁇ m as the internal state signal Ddet3.
- the shift register 6cc stores a predetermined number m of past power and present (in other words, a predetermined period of time).
- the total value ⁇ 1 to ⁇ m of T) is output as an internal state signal Ddet3 indicating the history of changes in the amount of audio signal in a good reception state.
- the audio processing unit 2 includes a cascade-connected data hold unit 2a, interpolation data insertion unit 2b, dummy data insertion unit 2c, frequency characteristic adjustment unit 2d, A TT amount adjustment unit 2e and a mute unit 2f are provided, and each unit 2a to 2f processes the audio signal Sau according to the instruction of the control signal Sent supplied from the control unit 3, thereby correcting the corrected audio signal. Generate and output Scmp.
- Each of the units 2a to 2f operates individually according to the instruction of the control signal Sent, thereby selectively performing signal processing on the audio signal Scmp.
- a center speaker SPc left and right channel main speakers SPm (L), SPm (R), left and right channel surround speakers SPs (L), SPs (R), subwoofer speaker SP (W), etc.
- a multi-channel audio signal Sau corresponding to a multi-channel speaker system having .
- the signal processing can be performed for each channel.
- the data hold unit 2a interpolates a signal component missing in the audio signal Sau by repeating the audio signal Sau for a predetermined period according to the instruction of the control signal Sent.
- the interpolation data insertion unit 2b performs an interpolation process for interpolating signal components missing in the audio signal Sau according to the instruction of the control signal Sent.
- the dummy data insertion unit 2c inserts a dummy data component into the audio signal Sau for reproducing a sound that is not harsh when the audio is reproduced by the speaker according to the instruction of the control signal Sent.
- the frequency characteristic adjustment unit 2d has a variable filter, and changes the passband and the gain and phase characteristics according to the instruction of the control signal Sent to change the frequency characteristics of the audio signal Sau. Adjust.
- the ATT amount adjustment unit 2e adjusts the attenuation amount according to the instruction of the control signal Sent.
- the mute unit 2f stops the supply of the audio signal Scmp to the audio reproduction unit 12 by cutting off (muting on) the output of the audio signal Sau in accordance with the instruction of the control signal Sent.
- control unit 3 is formed of a circuit having an arithmetic and control function having a microprocessor (MPU) and the like, and allows a user to specify a desired broadcast station or to use a multi-channel speaker system.
- An operation unit 14 for giving an instruction for performing sound reproduction and the like is connected.
- control unit 3 has the same configuration as the reception state determination unit 3a and the processing content determination unit 3b shown in FIG. 1 (b). It has the configuration shown.
- the control unit 3 determines the reception state based on information of the internal state signals Ddetl and Ddet2 supplied from the AGC unit 8 and the demodulation unit 5, that is, the AGC voltage, the bit error rate (BER), and the like. It has a reception state determination unit 3a and a processing content determination unit 3b.
- the processing content determination unit 3b includes a storage unit (hereinafter, referred to as a “table” t) 3ba in a look-up table format and a reception state deterioration interval detection unit. 3bb, a reception state deterioration period detection unit 3bc, a reception state deterioration frequency analysis unit 3bd, a control period detection unit 3be, and an output unit 3bl.
- the reception state detection period detection unit 3bc performs a predetermined period supplied as the internal state signal Ddet3. By comparing the count values ⁇ 1 to ⁇ m at T with a predetermined reference value THDw, a period Tw in which the reception state is deteriorated (hereinafter referred to as “reception state deterioration period”) Tw is detected.
- ⁇ 1 to ⁇ m are parameters indicating the amount of audio signal buffered in the audio memory 6b when the reception state is good, the larger the respective count value, the better the reception state and the respective count value. The smaller the value, the worse the reception condition becomes.
- the reception state degradation period detector 3bc compares the distribution of the count values ⁇ 1 to ⁇ m with the reference value THDw, and determines a period in which the distribution is smaller than the reference value THDw of the reception state degradation. Detected as period Tw.
- the distribution of the count values ⁇ 1 to ⁇ m is narrow in a temporally narrow period. Since the value increases or decreases, the reception state detection period Tw with a narrow time width is detected by comparing with the reference value THDw.
- the reception state detection period detecting unit 3bc compares the distribution based on the count values ⁇ 1 to ⁇ m with the reference value THDw, and thereby determines the period during which the reception state has deteriorated and the cause of the generation. And the like can be detected as the reception state bad period Tw.
- the reception state deterioration interval detecting unit 3bb compares the distribution of the count values ⁇ 1 to ⁇ m in the predetermined period T with the reference value THDw, and as shown in FIG.
- the reception condition deterioration frequency analysis unit 3bd performs the reception condition deterioration interval Tp and the reception condition deterioration period Tw output from the reception condition deterioration interval detection unit 3bb and the reception condition deterioration period detection unit 3bc, respectively.
- the above-mentioned multipath fading occurrence state and the characteristics in the reception state where the electric field strength is weak are detected, and the detection result is used as the text.
- Supply one bull 3ba is used as the text.
- the table 3ba contains signals for causing the audio processing unit 2 to perform signal processing.
- Each control data force is stored in advance as a combination of the respective control contents shown in FIG. 7 (d), and is supplied from the detection result supplied from the reception state degradation frequency analysis unit 3bd and from the reception state determination unit 3a. It is stored in advance in association with each information of the reception state.
- all the control data are not shown in each column of the controls (1) to (7) in FIGS. 7 (a) to 7 (c).
- the control data obtained by combining the respective control contents shown in () is stored in advance corresponding to each column of the controls (1) to (7).
- the control data corresponding to each information is selected. And outputs it to the output unit 3bf.
- table 3ba information indicating a stable reception state, such as a decrease in reception electric field strength or multi-path fusing, from reception state determination section 3a, and information indicating a detection result from reception state deterioration frequency analysis section 3bd are shown. Is supplied, the control data related to the electric field stabilizing sequence shown in FIGS. 7 (a) and 7 (d) is output.
- FIG. Output control data related to the multipath sequence shown in (d).
- the control period detection unit 3be compares the latest numerical value (ie, the latest audio signal amount) ⁇ m supplied to the shift register 6cc shown in FIG. 3A with the reference value THDw, and The period during which the value ⁇ m is smaller than the reference value THDw is supplied to the output unit 3bf as the control period Tent.
- the latest count value ⁇ m is compared with the reference value THDw, the period in which the above-described multipath fading is occurring or the period in which the electric field strength is weak is set as the control period Tent in real time. It is possible to detect.
- the output unit 3df transfers each control data output from the table 3ba to the audio processing unit 2 as a control signal Sent during the period specified by the control period Tent, and outputs the control data from the audio memory 6b in the decoder unit 6.
- the audio signal Sau is subjected to signal processing according to the control signal Sent.
- FIGS. 8 and 9. 8 and 9 show the operation of the audio signal processing unit 2 and the control unit 3.
- FIG. 8 shows the relationship of a so-called main routine
- FIG. 9 shows the relationship of a so-called subroutine.
- step STA8 When executing the “electric field stabilization sequence” shown in step STA8 in FIG. 8, the “multipath sequence” shown in step STA9, and the “weak electric field sequence” shown in step STA13, respectively, FIG.
- the operation is performed according to the flowchart, and when the operation is completed, the process returns to the process of step STA3 in FIG. 8 to repeat the operation.
- the control data shown in FIGS. When the audio processing unit 2 performs processing according to the contents of the data and performs the processing related to the “multi-pass sequence” shown in step STA9 in FIG. 8, the control data shown in FIGS. 7 (b) and (d) When the voice processing unit 2 performs the processing according to the contents, and performs the processing relating to the ⁇ weak electric field sequence '' shown in step STA13 in FIG. 8, according to the contents of the control data shown in FIGS. 7 (c) and (d). The audio processing unit 2 performs the processing.
- the control unit 3 checks the bit error rate (BER) based on the internal state signal Ddet2 in step STA1 in FIG. In STA2, it is determined whether or not the current reception state is good based on the bit error rate. If it is determined that the setting is good, the process proceeds to step STA3. When the setting for the audio signal processing device 1 is completed, such as when the user turns off the power, the operation is completed and the setting must be completed. If so, the processing from step STA1 is repeated. The determination as to whether the current reception state is good or not can be made, for example, by comparing the current bit error rate value with a specified value.
- step STA2 when the control unit 3 determines that the reception state is not good, the process proceeds to step STA4, and reads the AGC voltage Vagc based on the internal state signal Ddetl! Then, in step STA5, it is determined whether or not the current reception state is the state of the weak electric field based on the AGC voltage Vagc. If it is determined that the state is not a weak electric field, the process proceeds to step ST6. If it is determined that the state is a weak electric field, the process proceeds to step STA10. The determination as to whether or not the current reception state is a weak electric field state can be made, for example, by comparing the current AGC voltage Vagc value with a specified value.
- step STA6 the control unit 3 checks the change amount ⁇ age of the AGC voltage Vagc per predetermined time, and further proceeds to step STA7 to determine whether the change amount ⁇ Vagc is larger than the specified value Kagc. . If it is determined in step STA7 that the variation ⁇ Vagc is smaller than the specified value Kagc, it is determined that the received electric field is in a stable state, and the flow shifts to step STA8 to start the processing of FIG. 9 relating to the “electric field stable sequence”. I do.
- step STA7 if it is determined in step STA7 that the variation ⁇ Vagc is larger than the specified value Kagc, it is determined that the receiving state is affected by multipath fading or the like, and the process proceeds to step STA9, where The process in FIG. 9 relating to the “pass sequence” is started.
- step STA10 the control section 3 reads the C / N value Men based on the internal state signal Sdet2, and further, in step STA11, changes the C / N value Men per predetermined time. After confirming the amount ⁇ Men, proceed to step STA12. Then, in step STA12, it is determined whether or not the variation ⁇ Men is larger than the specified value Ken. If the variation ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ cn is larger than the specified value Ken, the reception state is affected by multipath fading or the like. Then, the process shifts to step STA9 to start the process of FIG. 9 relating to the “multipath sequence”.
- step STA12 when the variation ⁇ Men is smaller than the specified value Ken, it is determined that the reception state is in a weak electric field state, and the flow shifts to step STA13 to execute “weak electric field sequence”.
- the processing in FIG. 9 starts.
- the audio signal processing device 1 needs to determine the reception state based on the internal state of the reception unit Rx and perform signal processing on the audio signal Sa. If there is no, the control unit 3 performs no control to keep the current state of the voice processing unit 2 as it is, and repeats the processing of steps STA1 to STA3, while in step ST A2, the control unit 3 receives If it is determined that the state is not good, the reception state is determined, and one of the steps STA8, STA9, and STA13 according to the reception state is started.
- step STB1 in Fig. 9 the control unit 3 confirms the audio reproduction mode in which the user power is also specified. Then, in step STB2, if the audio playback mode (for example, 5.1 channel surround mode) for independently controlling the audio signal supplied to each speaker of the multi-channel speaker system is specified for each channel, The operation of the “independent control mode” of step STB3 is started, and if the audio reproduction mode for performing the same control on the audio signals of all the channels is specified, the “simultaneous control mode” of step STB14 is specified. Start operation.
- the audio playback mode for example, 5.1 channel surround mode
- step STB3 When the operation of the “independent control mode” of step STB3 is started, the audio processing unit 2 switches so as to independently process the audio signal Sau for each channel in accordance with an instruction from the control unit 3.
- step STB4 the reception state deterioration period detection unit 3bc in the control unit 3 confirms the reception state deterioration period Tw.
- step STB5 the reception state deterioration frequency analysis unit 3bd The time width of the reception state degradation period Tw is analyzed by comparing the time average value A (Tw) per period of the reception state degradation period Tw with a predetermined reference value THDtw.
- step STB6 If the time average value A (Tw) is smaller than the prescribed value THDtw, it is determined that the period during which the reception state is deteriorating is short, and the process proceeds to step STB6 where the time average value A (Tw ) Is greater than the prescribed value THDtw, the process proceeds to step STB10, judging that the period during which the reception state is inferior is long.
- step STB6 the reception state degradation interval detection unit 3bb confirms the reception state degradation interval Tp.
- step STB7 the reception state degradation frequency analysis unit 3bd sets the reception state degradation interval The time width of the reception condition deterioration interval Tp is analyzed by comparing the time average value A (Tp) per interval of Tp with a predetermined value THDtp.
- step STB8 If the time average value A (Tp) is smaller than the specified value THDtp, the process proceeds to step STB8. If the time average value A (Tp) is larger than the specified value THDtp, the process proceeds to step STB9.
- control unit 3 analyzes the characteristics between the reception state deterioration period Tw and the reception state deterioration interval Tp by performing the determination processing in steps STB4 to STB7, and according to the analyzed characteristics. Then, the processing of step STB8 or STB9 is performed!
- the reception state deterioration interval detection unit 3bb checks the reception state deterioration interval Tp.
- the reception state deterioration frequency analysis unit 3bd The time width of the reception condition deterioration interval Tp is analyzed by comparing the time average value A (Tp) of the state deterioration interval Tp per interval with a predetermined specified value THDtp. When the time average value A (Tp) is smaller than the specified value THDtp, the process proceeds to step STB12. When the time average value A (Tp) is larger than the specified value THDtp, the process proceeds to step STB13.
- control section 3 analyzes the characteristics between reception state degradation period Tw and reception state degradation interval Tp. Then, according to the analyzed characteristics, the processing of step STB12 or STB13 is performed. Yes.
- step STB8 the control section 3 performs the operations shown in FIGS.
- step STB9 the control data of the control (2) in the "independent control mode" of the "electric field stabilization sequence" shown in Figs. Is performed by the voice processing unit 2.
- step STB12 the control data of the control (3) in the "independent control mode" of the "electric field stabilization sequence" shown in Figs. 7 (a) and 7 (d) during the control period Tent. Is performed by the voice processing unit 2.
- step STB13 the control data of the control (4) in the "common” of the "electric field stabilization sequence" shown in Figs. 7 (a) and (d) during the control period Tent is used.
- the audio processing unit 2 To the audio processing unit 2.
- step STB14 the case where the operation of “simultaneous control mode” in step STB14 is started will be described.
- the audio processing unit 2 is switched to process the audio signal Sau independently for each channel according to the instruction from the control unit 3.
- step STB15 to STB18, STB21, and STB22 similar to steps STB4 to STB7, STBIO, and STB11 described above, a determination process based on the reception state deterioration period Tw and the reception state deterioration interval Tp is performed. Go to step STB19, STB20, STB23,
- step STB 19 the control in the “simultaneous control mode” of the “electric field stabilization sequence” shown in FIGS. 7A and 7D during the control period Tent (5)
- the processing according to the control data is performed by the audio processing unit 2.
- step STB20 when the process proceeds to step STB20, during the control period Tent, the control data of the control (6) in the "simultaneous control mode" of the "electric field stabilizing sequence" shown in Figs. Place Processing is performed by the voice processing unit 2.
- step STB23 when the process proceeds to step STB23, during the control period Tent, according to the control data of the control (7) in the "simultaneous control mode" of the "field stabilization sequence" shown in Figs. 7 (a) and 7 (d). To the voice processing unit 2.
- step STB24 the control data in the "common” control (4) of the "electric field stabilization sequence" shown in FIGS.
- the processing is performed by the audio processing unit 2.
- the control unit 3 When the operation of the "multipath sequence" is started, the control unit 3 also processes the power in step STB1 in Fig. 9, and similarly to the case of the above-mentioned "electric field stable sequence", the reception state deterioration period Tw Then, the judgment process based on the reception state deterioration interval Tp is performed, and any one of the steps STB8, S # 9, STB12, STB13, STB19, STB20, STB23, and STB24 is performed.
- step STB8 the control section 3 performs control (1) in the "independent control mode” of the “multi-sequence” shown in Figs.
- step STB13 the “common” in the “multipath sequence” shown in FIGS. According to the respective control data of the control (4) in the above, the voice processing unit 2 is caused to perform the processing for the control period Tent.
- step STB19 the control (5) in the “simultaneous control mode” of the “multi-sequence” shown in Figs. 7 (b)
- step STB23 the “multi-nos sequence” shown in FIG.
- control (7) in “Simultaneous control mode” of “Pass sequence” see Fig. 7 (b) and (d).
- the audio processing unit 2 performs processing during the control period Tent.
- step STA13 shown in FIG. 8
- the control unit 3 When the operation of the "weak electric field sequence" is started, the control unit 3 performs the processing from step STB1 in Fig. 9, similar to the case of the above-mentioned "electric field stable sequence” or "multipath sequence”. Then, a judgment process based on the reception state deterioration period Tw and the reception state deterioration interval Tp is performed, and any one of steps STB8, STB9, STB12, STB13, STB19, STB20, STB23, and STB24 is performed.
- step STB8 the control section 3 proceeds to the control (1) in the "independent control mode" of the "weak electric field sequence” shown in FIGS.
- the control in the “independent control mode” of the “weak electric field sequence” shown in Figs. 7 (c) and (d) (2) and when the process proceeds to step STB12, Control in the "independent control mode” of the "weak electric field sequence” shown in (3), and when the process proceeds to step STB13, the control in the "common” of the "weak electric field sequence” shown in Figs. 7 (c) and (d)
- the audio processing unit 2 is caused to perform processing during the control period Tent.
- step STB19 the control (5) in the “simultaneous control mode" of the “weak electric field sequence” shown in Figs. 7 (c) and (d), and when the process proceeds to step STB20, In the control (6) in the “simultaneous control mode” of the “weak electric field sequence” shown in FIGS. 7 (c) and (d), when the process proceeds to step STB23, the “ Control in the “simultaneous control mode” of the “weak electric field sequence” (7).
- step STB24 control in the “common” of the “weak electric field sequence” shown in Figs. 7 (b) and (d) (4) According to the respective control data, the audio processing unit 2 is caused to perform processing during the control period Tent.
- step STA3 shown in FIG.
- the receiving state is detected based on the plurality of internal states in the receiving unit Rx, so that the receiving state is accurately determined. Further, according to the determined reception state, the reception state is deteriorated by performing a process of reproducing a high-quality sound with a speaker or the like on the audio signal Sau in which the reception unit Rx force is also output. Even in this case, the sound can be reproduced with a speaker or the like without giving the user a feeling of strangeness.
- control unit 3 determines whether the reception state is good or bad based on the AGC voltage supplied to the front end unit 4 that performs high-speed processing. Therefore, the processing content for controlling the audio processing unit 2 is determined. Processing for determination can be performed quickly, and problems such as delay in processing of the audio signal Sau can be prevented from occurring.
- control unit 3 may control the audio processing unit 2 to perform detailed processing of the audio signal Sau for each channel. Therefore, high-quality sound can be reproduced by a speaker according to the reception state.
- the audio processing unit 2, the control unit 3, and the decoding unit 6 shown in Fig. 2 are implemented by a microprocessor (MPU) or a digital signal processor (DSP).
- MPU microprocessor
- DSP digital signal processor
- the computer program may be recorded on a recording medium such as a CD or a DVD, and may be installed on the microprocessor or the like and executed.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006511689A JPWO2005096512A1 (ja) | 2004-03-31 | 2005-03-29 | 音声信号処理装置 |
US10/594,725 US20070258601A1 (en) | 2004-03-31 | 2005-03-29 | Audio signal processing apparatus |
EP05727897A EP1732233A1 (en) | 2004-03-31 | 2005-03-29 | Sound signal processing device |
Applications Claiming Priority (2)
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JP2004107284 | 2004-03-31 | ||
JP2004-107284 | 2004-03-31 |
Publications (1)
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WO2005096512A1 true WO2005096512A1 (ja) | 2005-10-13 |
Family
ID=35064125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/005949 WO2005096512A1 (ja) | 2004-03-31 | 2005-03-29 | 音声信号処理装置 |
Country Status (4)
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US (1) | US20070258601A1 (ja) |
EP (1) | EP1732233A1 (ja) |
JP (1) | JPWO2005096512A1 (ja) |
WO (1) | WO2005096512A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007259336A (ja) * | 2006-03-24 | 2007-10-04 | Sanyo Electric Co Ltd | 放送受信装置 |
JP2015220475A (ja) * | 2014-05-14 | 2015-12-07 | アルパイン株式会社 | 放送受信機及びそのミュート制御方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101345392B1 (ko) | 2007-04-03 | 2013-12-24 | 삼성전자주식회사 | 데이터 방송 채널을 통해 디지털 컨텐츠를 수신하는 방법및 장치 |
US8306245B2 (en) | 2007-05-25 | 2012-11-06 | Marvell World Trade Ltd. | Multi-mode audio amplifiers |
CN102420536A (zh) * | 2011-12-12 | 2012-04-18 | 西安福安创意咨询有限责任公司 | 一种led隔离型双电源方法 |
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JPH08102686A (ja) * | 1994-09-30 | 1996-04-16 | Toshiba Corp | ミュート回路 |
JP2000174643A (ja) * | 1998-12-08 | 2000-06-23 | Toa Corp | デジタル無線受信機 |
JP2001156656A (ja) * | 1999-11-25 | 2001-06-08 | Fujitsu Ten Ltd | 車載用ディジタル放送受信機 |
JP2003273759A (ja) * | 2002-03-12 | 2003-09-26 | Denso Corp | 移動体用デジタル放送受信装置 |
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US4213129A (en) * | 1978-11-13 | 1980-07-15 | Motorola, Inc. | Delay stabilizing system |
FI86352C (fi) * | 1989-11-14 | 1992-08-10 | Nokia Oy Ab | Digitaliskt radiolaenksystem och foerfarande foer reglering av en saendingseffekt i ett digitaliskt radiolaenksystem. |
JP3272246B2 (ja) * | 1996-07-12 | 2002-04-08 | 株式会社東芝 | デジタル放送受信装置 |
JP3372018B2 (ja) * | 1997-03-13 | 2003-01-27 | ソニー株式会社 | データ受信装置およびデータ受信方法 |
JP2002051273A (ja) * | 2000-08-04 | 2002-02-15 | Pioneer Electronic Corp | 放送信号処理装置 |
US7155654B2 (en) * | 2003-04-04 | 2006-12-26 | Sst Communications, Corp. | Low complexity error concealment for wireless transmission |
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2005
- 2005-03-29 JP JP2006511689A patent/JPWO2005096512A1/ja active Pending
- 2005-03-29 EP EP05727897A patent/EP1732233A1/en not_active Withdrawn
- 2005-03-29 WO PCT/JP2005/005949 patent/WO2005096512A1/ja not_active Application Discontinuation
- 2005-03-29 US US10/594,725 patent/US20070258601A1/en not_active Abandoned
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JPS6387678U (ja) * | 1986-11-28 | 1988-06-08 | ||
JPH08102686A (ja) * | 1994-09-30 | 1996-04-16 | Toshiba Corp | ミュート回路 |
JP2000174643A (ja) * | 1998-12-08 | 2000-06-23 | Toa Corp | デジタル無線受信機 |
JP2001156656A (ja) * | 1999-11-25 | 2001-06-08 | Fujitsu Ten Ltd | 車載用ディジタル放送受信機 |
JP2003273759A (ja) * | 2002-03-12 | 2003-09-26 | Denso Corp | 移動体用デジタル放送受信装置 |
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JP2007259336A (ja) * | 2006-03-24 | 2007-10-04 | Sanyo Electric Co Ltd | 放送受信装置 |
JP2015220475A (ja) * | 2014-05-14 | 2015-12-07 | アルパイン株式会社 | 放送受信機及びそのミュート制御方法 |
Also Published As
Publication number | Publication date |
---|---|
US20070258601A1 (en) | 2007-11-08 |
JPWO2005096512A1 (ja) | 2008-07-31 |
EP1732233A1 (en) | 2006-12-13 |
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