CN104143987B - Device and method for communicating using pulse density modulation - Google Patents

Abstract

The invention discloses a device and a method for communication by pulse density modulation, wherein the device comprises: a pulse density modulation interface; a first circuit for outputting a clock and a data through the pulse density modulation interface; and a second circuit, for receiving the clock and the data through the pulse density modulation interface, and for determining whether the number of times of changing the level of the data reaches a threshold value when the level of the clock remains unchanged, so as to determine whether the clock and the data output by the first circuit conform to a start protocol, wherein the threshold value is equal to or greater than three.

Description

Device and method for communicating using pulse density modulation

technical field

The present invention relates to a device and method utilizing pulse density modulation, in particular to an electronic device, a communication method, an audio device and an amplifying device utilizing pulse density modulation for communication.

Background technique

Pulse Density Modulation (PDM) is a modulation method that expresses analog signals with a stream of one-bit digital signals, which is different from Pulse Code Modulation (PCM) through multi-bit Digital signals are used to quantify analog signals of different amplitudes, and pulse density modulation uses the number density of a digital signal to represent the strength of the corresponding analog signal.

Generally speaking, the interface using pulse density modulation is quite simple. It consists of a clock pin and a data pin. It is usually used in an audio device, wherein the clock pin is used to transmit a clock, and the data pin is used to transmit a clock. The pin transmits the signals of the left and right channels respectively according to the rising and falling edges of the clock pulse. Because the composition of the pulse density modulation interface is quite simple, the early pulse density modulation interface can only be used to transmit data without control function. However, with the evolution of technology, the current pulse density modulation interface can realize writing control by transmitting specific data patterns. More precisely, the current pulse density modulation interface can Sequentially transmit digital data with a specific pattern (such as 11000101 or 10010101 repeated 64 times), so as to write control to the recipient of the digital data (that is, a receiving end) (for example, 11000101 repeated 64 times represents the written value 1; 10010101 repeated 64 times represents the write value 0). However, the above method can only control a preset component in the receiving end, and cannot flexibly select an object to write, and the above method can only control the receiving end in one direction, and cannot allow the receiving end to reversely Provide data to the digital data provider.

Contents of the invention

In view of the deficiencies in the prior art, an object of the present invention is to provide an electronic device, a communication method, an audio device, and an amplification device using pulse density modulation for communication, so as to solve the problems in the prior art.

The invention discloses an electronic device using pulse density modulation for communication. According to an embodiment of the present invention, the electronic device includes: a pulse density modulation interface; a first circuit for outputting a clock and a data through the pulse density modulation interface; and a second circuit for outputting a clock through the pulse density modulation interface The pulse density modulation interface receives the clock and the data, and is used to judge whether the number of changes in the level of the data reaches a threshold value when the level of the clock remains unchanged, so as to judge the first circuit Whether the output clock and the data conform to an initial protocol, wherein the threshold is equal to or greater than three.

In the above embodiment, after the first circuit outputs the clock and data conforming to the initial protocol, the first circuit can output a writing information to the second circuit via the pulse density modulation interface, so that the first circuit The second circuit processes according to the write information, and can output a read request to the second circuit through the pulse density modulation interface, so that the second circuit provides at least one read request through the pulse density modulation interface according to the read request. Read data to the first circuit, so as to achieve two-way communication.

The present invention also discloses a communication method using pulse density modulation, which is realized by the electronic device of the present invention or its equivalent device. According to an embodiment of the present invention, the communication method includes the following steps: a modulation output step; and a reception judgment step. The step of modulating output includes: keeping the level of a clock pulse unchanged, and outputting the clock pulse through a pulse density modulation interface; and changing the level of a data during the period when the level of the clock pulse remains unchanged up to N times, and output the data via the pulse density modulation interface, wherein the N is equal to or greater than three. The receiving judging step is used to receive the clock and the data through the pulse density modulation interface, including: judging whether the level of the data changes up to N times during the period when the level of the clock remains unchanged, so as to determine Whether an initial protocol is satisfied.

The communication method above may further include: an access request step, used to output a write message or a read request via the pulse density modulation interface after the receiving judging step judges that the initial protocol is satisfied; and a The access response step is used to receive the write information or the read request through the pulse density modulation interface, and process according to the write information, or provide at least one via the pulse density modulation interface according to the read request read data.

The present invention also discloses an electronic device using pulse density modulation for communication, which is used for performing an access operation after an initial protocol is satisfied. An embodiment of the electronic device includes: a pulse density modulation interface including a clock path and a data path; a first circuit for outputting a clock via the clock path and outputting data via the data path; and A second circuit, used to receive the clock via the clock path and the data via the data path, and to determine whether the clock and the data conform to the aforementioned initial protocol, wherein if the clock conforms to the data In the initial protocol, the first circuit can output a writing information to the second circuit through the pulse density modulation interface, so that the second circuit can process according to the writing information, and the first circuit can also output a writing information through the pulse density modulation interface. The density modulation interface outputs a read request to the second circuit, so that the second circuit provides at least one read data to the first circuit through the pulse density modulation interface according to the read request.

The present invention further discloses an audio device using pulse density modulation for communication. An embodiment of the audio device includes: a pulse density modulation interface consisting of a clock path and a data path; and an audio circuit for outputting a clock via the clock path and outputting a data via the data path , and used to notify a receiving end to prepare for an access operation through the clock and the data, wherein when the audio circuit is used to notify the receiving end to prepare for the access operation, the audio circuit keeps the level of the clock pulse unchanged , while changing the level of the data for at least three times, so as to notify the receiving end to prepare for the access operation.

Correspondingly, the present invention discloses an amplifying device using pulse density modulation for communication. An embodiment of the amplifying device includes: a pulse density modulation interface formed by a clock path and a data path; and an amplifying circuit for receiving a clock via the clock path and receiving a data via the data path , and is used to judge whether the number of changes of the data level reaches a threshold when the level of the clock remains unchanged, so as to determine whether to execute an access operation, wherein the threshold is equal to or greater than three.

Regarding the characteristics, implementation and effects of the present invention, preferred embodiments are described in detail below in conjunction with the drawings.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of an electronic device for communication using pulse density modulation according to the present invention;

Fig. 2 is a schematic diagram of an embodiment of writing information of the present invention;

Fig. 3 is a schematic diagram of an embodiment of reading information of the present invention;

4 is a schematic diagram of an embodiment of a combination of clock and data conforming to the initial protocol of the present invention;

FIG. 5 is a schematic diagram of an embodiment of the second circuit of FIG. 1;

FIG. 6 is a schematic diagram of an embodiment of a communication method using pulse density modulation to communicate according to the present invention; and

FIG. 7 is a schematic diagram of another embodiment of a communication method using pulse density modulation to communicate according to the present invention.

Wherein, the reference signs are explained as follows:

100: Electronic devices that communicate using pulse density modulation

110: Pulse density modulation interface

112: Clock path

114: Data path

120: First Circuit

130: second circuit

200: write information

210: Write request

212: Write component code

214: memory write address

216: Write instruction

220: Write data

230: interval field

300: read information

310: Read Request

312: Read component code

314: memory read address

316: Read instructions

320: read data

330: interval field

410: Clock

420: data

510: counting unit

520: judgment unit

ID: component code

ADDR: memory address

W: write instruction

T: interval field

WD: write data

R: read instructions

RD: read data

S610: a modulation output step, used to output a predetermined combination of clock and data via a pulse density modulation interface

S620: a receiving judging step, used for receiving the clock and the data through the pulse density modulation interface, and judging whether an initial protocol is satisfied accordingly

S630: an access request step, used to make a write information or a read request

S640: An access response step, used for receiving the write information or the read request through the pulse density modulation interface and responding accordingly

detailed description

The technical terms in the following explanations refer to the customary terms in this technical field. If some terms are explained or defined in this manual, the explanations or definitions of this part of the terms shall prevail. In addition, on the premise that implementation is possible, the meaning of the relative relationship between objects or events described in this specification may include direct or indirect relationship. The so-called "indirect" means that there is still an intermediate object or physical space between objects. Or refers to the existence of intermediate events or time intervals between events. Furthermore, the following content is about the pulse density modulation (Pulse Density Modulation, PDM) technology, and the common technologies or principles in this field will not be described in detail unless the technical features of the present invention are involved. In addition, the shapes, sizes, proportions, and steps of the processes in the illustrations are only illustrative, for those skilled in the art to understand the present invention, rather than limiting the implementation scope of the present invention.

In addition, each embodiment of the following description has one or more technical features respectively, but this does not mean that the inventor must implement all the technical features in any embodiment at the same time, or can only separately implement the technical features in different embodiments. Some or all of the technical features. In other words, as long as the possibility of implementation is not affected, those skilled in the art can selectively implement some or all of the technical features in any embodiment according to the disclosure of the present invention and according to their own needs or design specifications , or selectively implement a combination of some or all of the technical features in multiple embodiments, so as to increase the flexibility of the implementation of the present invention.

The present invention includes devices and methods for communicating using pulse density modulation, which can be applied to an audio system (such as an audio playback system or an audio recording system) or other systems using a pulse density modulation interface ( For example a dimming system). On the premise that the implementation is possible, those skilled in the art can select equivalent elements or steps according to the disclosure in this specification to implement the present invention. Since some components included in the device of the present invention may be known components individually, the details of the known components will be omitted in the following description on the premise of not affecting the disclosure requirements and implementability of the device invention. In addition, the communication method using pulse density modulation of the present invention can be realized by the device of the present invention or its equivalent device. On the premise of not affecting the disclosure requirements and practicability of the method invention, the following description of the method invention will be Focusing on the content of the steps, relevant hardware can be selected by those skilled in the art according to the disclosure of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of an embodiment of an electronic device using pulse density modulation for communication according to the present invention. This embodiment is used to perform subsequent write or read operations after a start protocol (Start Protocol) is satisfied. The electronic device 100 includes: a pulse density modulation interface 110, including a clock path 112 and a data path 114, or only composed of the clock path 112 and the data path 114; a first circuit 120, coupled to the The pulse density modulation interface 110 is used to output a clock via the clock path 112 and output a data via the data path 114; and a second circuit 130 is used to receive the clock via the clock path 112 and the data path 114 respectively. clock and the data, and are used to judge whether the initial protocol is satisfied according to the clock and the data, for example, the second circuit 130 can judge whether the level of the clock remains unchanged The number of flat changes (such as the total number of rising and falling edges of the data) reaches a threshold value, so as to judge whether the clock and data output by the first circuit 120 conform to the initial protocol, wherein the gate The limit is equal to or greater than three in this example.

Based on the above, in this embodiment, the first circuit 120 includes an audio circuit (such as an audio coder/decoder (Audio Coder/Decoder)), which is used to output a digital audio signal; the second circuit 130 includes One or more amplifying circuits are used to amplify the digital audio signal for playback. When the first circuit 120 intends to change at least one setting value of the second circuit 130 to achieve different effects or to read at least one setting value of the second circuit 130 to understand its hardware capabilities to adaptively adjust the output , the first circuit 120 will modulate the aforementioned clock and data and output them, so as to notify the second circuit 130 to prepare for subsequent write or read operations. More precisely, the second circuit 130 will The received clock and data are used to determine whether the aforementioned initial protocol is satisfied, and perform subsequent read and write operations after the initial protocol is satisfied. However, in order to avoid noise during the above-mentioned communication process, the first circuit 120 can transmit a predetermined digital data sequentially according to the level change of the clock before notifying the second circuit 130 to prepare for read and write operations. stream to the second circuit 130 to issue a mute instruction, so that the second circuit 130 enters a mute state, and then the first circuit 120 performs modulation control on the aforementioned clock and data, and The modulated clock and data are output to the second circuit 130 for subsequent operations. Please note that the above mute indication can be replaced by other control indications (such as a low volume indication), as long as the aforementioned noise can be avoided or reduced. Please also note that although the above description takes the audio circuit and the amplifier circuit as examples, this is only for those skilled in the art to understand the application of the present invention, and is not intended to limit the present invention. In other words, the first circuit 120 and the second circuit 120 130 can respectively include other circuits (such as a dimming circuit and a lighting circuit) to realize different applications.

In addition, in order to achieve the above read and write operations, after the first circuit 120 outputs the clock and data conforming to the initial protocol, the first circuit 120 can output a write information to the first circuit 120 through the pulse density modulation interface 110 The second circuit 130 enables the second circuit 130 to process according to the written information, and can output a read request to the second circuit 130 through the pulse density modulation interface 110, so that the second circuit 130 can output a read request to the second circuit 130 according to the read information. It is required to provide at least one read data to the first circuit 120 via the PWM interface 110 . Please refer to FIG. 2, an embodiment of the above-mentioned write information 200 includes: a write request 210, including a write component code (ID) 212, a memory write address (ADDR) 214 and a write instruction (W) 216, the write component code 212 is used to indicate at least one component in the second circuit 130, the memory write address 214 is used to indicate a data storage address corresponding to the at least one component, and the write instruction 216 is used to Inform the second circuit 130 to prepare for a write operation; a write data (WD) 220, used to update the data corresponding to the memory write address 214; and a space field (T) 230, between the write request Between 210 and the write data 220, it is used to correspond to the access transition period (Transition) between the write request 210 and the write data 220. At the same time, another interval field 230 can be set in the write data After 220, it is used as a separation from the next data. Similarly, as shown in FIG. 3, the aforementioned read request 310 includes a read element code (ID) 312, a memory read address (ADDR) 314 and a read instruction (R) 316, the read element code 312 Used to indicate at least one element in the second circuit 130, the memory read address 314 is used to indicate a data storage address corresponding to the at least one element, and the read instruction 316 is used to inform the second circuit 130 to prepare a Read operation, when the second circuit 130 receives the read request 310, it can provide a read data (RD) 320 corresponding to the memory read address 314 to the first circuit 120 accordingly, the read There may also be a gap field (T) 330 between the request 310 and the read data 320 to correspond to an access transition period, and there may also be another gap field 330 after the read data 320 for separation, wherein The read request 310 , the interval field 330 and the read data 320 are included in a read message 300 .

Please note that the above-mentioned formats of the writing information 200 and the reading information 300 are just examples, and other formats should also be adopted by the present invention under the premise that the implementation is possible. For example, when the object to be written or read is the same or fixed, the write component code 212 and the read component code 312 are unnecessary. In other words, the write information 200 may only include the memory write address 214 , write instruction 216 , write data 220 and interval field 230 , and the read information 300 may only include the memory read address 314 , read instruction 316 , read data 320 and interval field 330 . For another example, when the presence or absence of the interval field 230 , 330 does not affect the processing of the writing information 200 or reading information 300 by the second circuit 130 , the interval field 230 , 330 is also unnecessary.

Whether or not the aforementioned initial protocol conforms determines whether subsequent read and write operations are performed. As mentioned above, the embodiment in FIG. 1 defines the initial protocol through the combination of clock and data levels. More precisely, please refer to FIG. 1 and FIG. 4, when the clock 410 remains unchanged (for example, remains at a high level or a low level, the clock 410 remains at a high level in FIG. If the number of changes in the level reaches a threshold value (for example, a value equal to or greater than 3, the threshold value is 3 as indicated by the arrow in FIG. 4 ), the second circuit 130 in FIG. The initial agreement. In order to perform the judgment, as shown in FIG. 5, an embodiment of the second circuit 130 includes: a counting unit 510, which is used to count the level of the data when the level of the clock remains unchanged. The number of times of change, so as to generate a counting result; and a judging unit 520, used to compare the counting result with the aforementioned threshold value, so as to judge whether the clock and the data conform to the initial protocol, in another aspect of the present invention In an embodiment, the judging unit 520 may further reset the counting unit 510 after comparing the counting result with the threshold value for the next judgment. Please note that the above-mentioned embodiment of the second circuit 130 is only an example, and other equivalent circuits must also be adopted by the second circuit 130. For example, the counting unit 510 and the judging unit 520 can also be composed of a ripple counter (Ripple Counter ) to achieve, because the working principle of the ripple counter is to use the output signal of the previous stage as the input clock of the next stage when the input signal of each stage (such as the aforementioned clock) remains unchanged, so when a K stage The output signal of the last stage of the ripple counter has a level change, which represents that the input clock of the first stage of the ripple counter (such as the aforementioned data) has changed multiple times (for example, 2K times). In other words, whether the level of the output signal of the last stage changes can be used to indicate whether the initial protocol is satisfied. Please also note that the initial protocol may also be defined by other combinations of clock and data. For example, the first circuit 120 may transmit data with a specific duty cycle or pattern during the period when the clock remains constant to represent For the initial protocol, because those skilled in the art can adopt the appropriate combination of clock and data according to the disclosure of the present invention, redundant descriptions are omitted here on the premise of meeting the requirements of the disclosure and practicability , to avoid redundant text.

Please refer to FIG. 1 again, the first circuit 120 in FIG. 1 can also be implemented separately. For example, the first circuit 120 can be an audio device using pulse density modulation for communication, including: a pulse density modulation interface, composed of a clock path and a data path; and an audio circuit for Outputting a clock through the clock path and outputting a data through the data path, and using the clock and the data to notify a receiving end (such as the second circuit 130 in FIG. 1 ) to prepare for an access operation, wherein when the audio When the circuit is used to notify the receiving end to prepare for the access operation, the audio circuit keeps the level of the clock pulse unchanged, and at the same time changes the level of the data for at least three times, so as to inform the receiving end to prepare for the access operation. Similarly, the second circuit 130 in FIG. 1 (or FIG. 5 ) can also be implemented separately. For example, the second circuit 130 can be an amplifying device for communication through pulse density modulation, including: a pulse density modulation interface, composed of a clock path and a data path; and an amplifying circuit for A clock is received through the clock path and a data is received through the data path, and is used to determine whether the number of changes in the level of the data reaches a threshold value when the level of the clock remains unchanged, so as to determine whether To perform an access operation, wherein the threshold value is equal to or greater than three, the amplifying circuit may include related components (for example, the counting unit 510 and the judging unit 520 in FIG. 5 ) to judge whether the number of changes in the data level reaches the gate limit. Please note that since those skilled in the art can understand the implementation details and changes of the above-mentioned audio device and amplifying device from the relevant disclosures in FIGS.

Please refer to FIG. 6 , in addition to the electronic device, audio device and amplification device disclosed above, the present invention also discloses a communication method using pulse density modulation for communication. The communication method can be realized by the electronic device of the present invention or its equivalent device, and includes the following steps:

Step S610: a modulation output step for outputting a predetermined combination of clock and data via a pulse density modulation interface. In this embodiment, step S610 includes: keeping the level of a clock constant, and outputting the clock through the pulse density modulation interface; and changing the level of a data while the level of the clock remains constant. Plane N times, and output the data via the pulse density modulation interface, wherein the N is equal to or greater than three; and

Step S620: a receiving judging step, used for receiving the clock and the data via the PWM interface, and judging whether an initial protocol is satisfied accordingly. In this embodiment, step S620 includes: judging whether the level of the data changes N times during the period when the level of the clock remains unchanged, so as to determine whether the initial protocol is satisfied.

The aforementioned step S610 is executed by a first circuit, while step S620 is executed by a second circuit. In this embodiment, the first circuit includes an audio circuit and the second circuit includes an amplifying circuit, so as to realize the application in the audio field; however, those skilled in the art can make the first and second circuits respectively include other circuits (such as a dimming circuit and a lighting circuit), and implement different applications according to the disclosure of the present invention. Please note that when this embodiment is used to implement audio applications, it may further include a mute step to avoid unnecessary noise. Before performing step S610, the mute step outputs a mute through the pulse density modulation interface. indication or a low volume indication to keep the aforementioned second circuit quiet.

Whether the aforementioned initial protocol is satisfied or not is related to whether to perform subsequent access operations. Therefore, after the aforementioned step S620 determines that the initial protocol is satisfied, this embodiment can further perform at least the following steps (as shown in FIG. 7 ):

Step S630: an access request step, used for making a write information or a read request. In this embodiment, step S630 includes: outputting a write message or a read request through the pulse density modulation interface after judging that the initial protocol is satisfied in step S620; and

Step S640: an access response step, used to receive the write information or the read request via the PWM interface and respond accordingly. In this embodiment, step S640 includes: performing processing according to the written information (for example, changing at least one circuit setting value according to the written information), or providing at least one read via the pulse density modulation interface according to the read request data.

Because those skilled in the art can understand the implementation details and changes of the method inventions in FIGS. 6 and 7 through the relevant disclosures in FIGS. 1 to 5 , therefore, without affecting the disclosure requirements and implementability of the method invention Duplicate and redundant descriptions will be omitted under the premise. Please note that in this specification, the steps of the various method inventions are not limited to the order in which they may be implemented.

In summary, the present invention allows a transmitting end (i.e. the aforementioned first circuit) to flexibly select the object to be controlled, and allows a receiving end (i.e. the aforementioned second circuit) to reversely report to the transmitting end To provide data, in short, the present invention achieves the purpose of increasing control flexibility and realizing two-way communication through a limited transmission interface.

Although the embodiments of the present invention are as described above, these embodiments are not intended to limit the present invention, and those skilled in the art can make changes to the technical characteristics of the present invention according to the explicit or implicit content of the present invention. All these changes may belong to the scope of patent protection sought by the present invention. In other words, the scope of patent protection of the present invention shall be subject to what is defined in the claims of this specification.

Claims (19)

1. a kind of electronic installation linked up using impulse density modulation, comprising：

One impulse density modulation interface；

One first circuit, for exporting a clock pulse and a data via the impulse density modulation interface；And

One second circuit, for via the impulse density modulation interface clock pulse and the data, and for judging at this Whether the change number of times of the level of the data with this judges first circuit institute defeated up to a threshold value when level of arteries and veins keeps constant Whether the clock pulse gone out meets a starting agreement with the data, and the wherein threshold value is equal to or more than three；

Wherein meet the clock pulse of the starting agreement in first circuit output and after the data, first circuit is except can be via Impulse density modulation interface output one writes information to the second circuit, make the second circuit according to the write-in information at Reason, and a reading requirement can be exported via the impulse density modulation interface to the second circuit, make second circuit foundation should Reading requirement provides at least one reading data via the impulse density modulation interface and gives first circuit.

2. electronic installation as claimed in claim 1, wherein first circuit include a voicefrequency circuit, the second circuit includes one Amplifying circuit.

3. electronic installation as claimed in claim 2, wherein first circuit in output meet the clock pulse of the starting agreement with Before the data, a Jing Yin instruction or a bass amount instruction are exported to the second circuit via the impulse density modulation interface.

4. electronic installation as claimed in claim 1, wherein the write-in packet contain：

One write-in is required, including a memory write address is indicated with a write-in；And

One write-in data.

5. the requirement of electronic installation as claimed in claim 4, the wherein write-in is also included：One write element code；Wherein, this is write Enter components codes and be used to refer in the second circuit an at least element, the memory write address is used to refer to should at least one One data storage address of element, and the write-in indicate to be used for informing that the second circuit prepares a write operation.

Refer to 6. electronic installation as claimed in claim 1, the wherein reading requirement read address and read with one comprising a memory Show.

7. electronic installation as claimed in claim 6, the wherein reading requirement also include a read element code；Wherein, the reading Components codes are taken to be used to refer in the second circuit an at least element, the memory reads address and is used to refer to should at least one One address data memory of element, and the reading indicate to be used for informing that the second circuit prepares a read operation.

8. electronic installation as claimed in claim 1, the wherein second circuit are included：

One counting unit, in the case of keeping constant in the level of the clock pulse, counts the change number of times of the level of the data, A count results are produced according to this；And

One judging unit, for comparing the count results and the threshold value, judges whether the clock pulse meets this with the data according to this Originate agreement.

9. electronic installation as claimed in claim 1, wherein the impulse density modulation interface is by a clock pulse path and a data road Footpath is constituted.

10. a kind of communication method linked up using impulse density modulation, is linked up by one using impulse density modulation Electronic installation is performed, and is comprised the steps of：

One modulation exports step, comprising：

Keep the level of a clock pulse constant, and the clock pulse is exported via an impulse density modulation interface；And

During the level of the clock pulse keeps constant, the level for changing a data reaches n times, and is connect via the impulse density modulation Mouth exports the data, and the wherein N is equal to or more than three；And

One receives judgment step, for via the impulse density modulation interface clock pulse and the data, comprising：

Judge whether the level of the data during the level holding of the clock pulse is constant changes up to n times, to determine that a starting is assisted Whether view is satisfied；

It is further included：

One access requirement step, comprising：

After the reception judgment step judges that the starting agreement is satisfied, believe via the write-in of impulse density modulation interface output one Breath or a reading requirement；And

One access response step, for via the impulse density modulation interface write-in information or the reading requirement, comprising：

Handled according to the write-in information, or at least one is provided via the impulse density modulation interface according to the reading requirement and read Access evidence.

11. communication method as claimed in claim 10, the wherein modulation output step are performed by one first circuit, the reception Judgment step is performed by a second circuit, and first circuit includes a voicefrequency circuit, and the second circuit includes an amplification electricity Road.

12. communication method as claimed in claim 11, it is further included：

One muting step, in perform the modulation output step before, via the impulse density modulation interface output one it is Jing Yin instruction or One bass amount instruction, makes the second circuit keep quite.

13. communication method as claimed in claim 10, wherein the step of being handled according to the write-in information includes：Foundation should Write information and change an at least circuit configuration value.

14. a kind of electronic installation linked up using impulse density modulation, for carrying out one after a starting agreement is satisfied Accessing operation, comprising：

One impulse density modulation interface, including a clock pulse path and a data path；

One first circuit, for exporting a clock pulse via the clock pulse path and exporting a data via the data path；And

One second circuit, for receiving the clock pulse via the clock pulse path and receiving the data via the data path, is used in combination To judge whether the clock pulse and the data fit starting agreement,

If the wherein clock pulse and the data fit starting agreement, first circuit can be defeated via the impulse density modulation interface Go out one and write information to the second circuit, the second circuit is handled according to the write-in information, first circuit also can A reading requirement is exported to the second circuit via the impulse density modulation interface, the second circuit is passed through according to the reading requirement At least one reading data, which are provided, by the impulse density modulation interface gives first circuit.

15. electronic installation as claimed in claim 14, wherein first circuit include a voicefrequency circuit, and the second circuit bag Containing an amplifying circuit.

16. electronic installation as claimed in claim 14, the wherein second circuit are further utilized to the level holding in the clock pulse Judge whether the change number of times of the level of the data reaches a threshold value in the case of constant, the clock pulse and the data are judged according to this Whether the starting agreement is met.

17. a kind of audio devices linked up using impulse density modulation, comprising：

One impulse density modulation interface, is to be made up of a clock pulse path with a data path；And

One voicefrequency circuit, for exporting a clock pulse via the clock pulse path and exporting a data via the data path, is used in combination To prepare an accessing operation by the clock pulse and the receiving terminal of data notification one,

Wherein when the voicefrequency circuit is used for notifying that the receiving terminal prepares the accessing operation, the voicefrequency circuit keeps the electricity of the clock pulse It is flat constant, while the level for changing the data reaches at least three times, to notify the receiving terminal to prepare the accessing operation；

The wherein voicefrequency circuit is in notifying the receiving terminal to prepare after the accessing operation, further via the impulse density modulation interface Output one writes information or a reading requirement to the receiving terminal to realize the accessing operation.

18. a kind of amplifying device linked up using impulse density modulation, comprising：

One impulse density modulation interface, is made up of a clock pulse path with a data path；And

One amplifying circuit, for receiving a clock pulse via the clock pulse path and receiving a data via the data path, is used in combination Come judge in the clock pulse level keep it is constant when the data level change number of times whether up to a threshold value, determined with this be One accessing operation of no execution；

Wherein the threshold value is equal to or more than three；

Wherein the accessing operation includes：Handled according to by a write-in information of the impulse density modulation interface, or According to the reading requirement by the impulse density modulation interface, provide at least one via the impulse density modulation interface and read Data.

19. amplifying device as claimed in claim 18, the wherein amplifying circuit are further included：

One counting unit, in the case of keeping constant in the level of the clock pulse, counts the change number of times of the level of the data, A count results are produced according to this；And

One judging unit, for comparing the count results and the threshold value, and is equal to or more than the threshold value in the count results When the amplifying device is performed the accessing operation.