CN101227243B

CN101227243B - Fm transmitter supporting broadcast/wireless broadcast data system and channel selecting method

Info

Publication number: CN101227243B
Application number: CN2008100035096A
Authority: CN
Inventors: 真野竜哉
Original assignee: Rohm Co Ltd
Current assignee: Rohm Co Ltd
Priority date: 2007-01-19
Filing date: 2008-01-18
Publication date: 2012-01-18
Anticipated expiration: 2028-01-18
Also published as: JP2008177959A; CN101227243A; JP4728973B2

Abstract

The invention provides a FM transmitter for supporting the RDS/RBDS. A data generating part sets preset value for the data item as reference for selecting the broadcasting station at receiving end and generates the data in RDS/RBDS format. A FM modulator modulates and outputs the frequency of the data in RDS/RBDS format generated by the data generating part. The data item can be program type. The program type is set, without reference to the variety of the data sent by the FM transmitter. The transmitter sets the value of program type as preset value to select the broadcasting station.

Description

Support the FM transmitter and the method for channel selection thereof of broadcast/wireless broadcast data system

Technical field

Radio data system) or RBDS (Radio Broadcast Data System: FM transmitter RBW Radio Broadcast Data System) the present invention relates to support RDS (Radio Data System:.

Background technology

In recent years, the FM broadcasting office in Europe and the radio broadcasting office of the U.S. just send additional informations such as text with the RDS (radio data system) in Europe or RBDS (RBW Radio Broadcast Data System) information of the U.S..If utilize RDS/RBDS, then in the receiver of vehicle-mounted radio, can use the title of the current broadcasting office that is just receiving, the various information such as type of music (patent documentation 1,2).

On the other hand, known have convert audio signal to the stereo mix signal, the frequency of utilization modulator carries out the FM transmitter (patent documentation 3～5) exported after the frequency modulation(FM).If use the FM transmitter, then can be not via wiring ground transmit audio signals such as RCA cables, thereby can be used in the CD recorder changer (changer) of onboard audio and the transmission of the signal between automobile audio body (head unit) etc.Particularly in recent years; Though hard disc audio equipment, memory audio frequency apparatus, the portable telephone terminal with music reproduction function are extensively popularized; But in the purposes of the music data of the miniaturized electronics such, being stored, also using the FM transmitter from the loudspeaker reproduction of fixed component stereo system etc.

Patent documentation 1: the spy opens flat 8-256135 communique

Patent documentation 2: the spy opens flat 8-191232 communique

Patent documentation 3: the spy opens flat 9-069729 communique

Patent documentation 4: the spy opens flat 10-013370 communique

Patent documentation 5: the spy opens flat 9-312588 communique

Non-patent literature 1:NATIONAL RADIO SYSTEMS COMMITTEE, " UNITED STATES RBDS STANDARD ", the U.S., on April 9th, 1998

Summary of the invention

(inventing problem to be solved)

Here, the receive frequency that in the past was the user through manually making radio tuner (receiver) and the transmission frequency of FM transmitter are corresponding to.In this case, the user will discern the frequency of FM transmitter-side, and gives radio tuner side with this frequency setting, so cumbersome.In addition, when the transmission frequency of FM transmitter and other broadcasting office overlaids, need set the transmission frequency of FM transmitter and the receive frequency of radio tuner once more.

The present invention designs in view of such problem, and its overall purpose is to provide a kind of can easily carry out the FM transmitter that channel selection and frequency are harmonized.

(being used to solve the means of problem)

A scheme of the present invention relates to a kind of FM transmitter that sends the signal that meets RDS (Radio Data System) or RBDS (Radio Broadcast Data System) form.This FM transmitter comprises: data generation portion to setting predetermined value as the data items of channel selection benchmark the recipient, generates the data of RDS/RBDS form; Frequency modulator carries out frequency modulation(FM) and output to the data of the RDS/RBDS form that generated by data generation portion.

So-called " can be used as the data items of channel selection benchmark " is meant employed data in the retrieval of harmonizing, and as technological prerequisite, receiver is set certain value in data items after, but Automatic Extraction goes out the frequency that data items has this value.

According to this scheme, when the frequency of receiver being harmonized for the transmission frequency, without incoming frequency, but as long as to data project input predetermined value, receiver just can select data items to have the channel of predetermined value automatically.

Data items can be a program category.For example, as program category, when having set predetermined value " news ", in receiver,, then can make the automatic channel selection of FM transmitter if program category is set at " news ".

Program category can be that the kind with the data of sending from the FM transmitter irrespectively is set.That is, even set predetermined value " news ", the content of the audio signal of sending from the FM transmitter also needs not to be news, can be content arbitrarily.Different with the broadcasting of broadcasting office in this.

Data items can be music/speech (Music/speech) code.Music/language codes can be that the kind with the data of sending from the FM transmitter irrespectively is set.

Data generation portion can be according to user's given settings predetermined value.If make the user can change the value of data items of value and FM transmitter-side of the data items of receiver side, then can be convenient.

The FM transmitter can be integrated on a Semiconductor substrate.So-called " integrating "; All structure important documents that comprise circuit all are formed on the situation on the Semiconductor substrate; And the primary structure important document of circuit situation about being integrated, also can a part of resistance, capacitor etc. be arranged on the outside of Semiconductor substrate for the regulating circuit constant.Through these circuit being integrated into a LSI, can reduce circuit area.

Another program of the present invention is a kind of electronic equipment.This electronic equipment comprises: the FM transmitter of above-mentioned arbitrary scheme; Primary processor links to each other with the FM transmitter via predetermined bus, obtains the specified predetermined value of user, sends the FM transmitter to.The FM transmitter is to the specified predetermined value of data project settings user.

Another scheme of the present invention relates to a kind of automatic channel selection method that utilizes RDS (Radio Data System)/RBDS (Radio Broadcast Data System).This method is carried out in the FM transmitter: the step of the data items of the RDS/RBDS that can in receiver, be set at the channel selection benchmark being set predetermined value; Be created on the step of the data of the RDS/RBDS form of having set predetermined value in the data items; The data of RDS/RBDS form are carried out the step of frequency modulation(FM) and output.In the FM receiver, carry out receiving electric wave, the data of RDS/RBDS form are decoded, extract the channel that the data items that can be used as the channel selection benchmark has predetermined value, and carry out tuning step.

According to this scheme,, can carry out automatic channel selection through making the data items and the predetermined value that set in transmitter and the receiver consistent.

Should be noted that the combination in any of said structure important document or reconfigure etc. all effectively as the embodiment that is proposed, perhaps covered by the embodiment that is proposed.

In addition, this summary of the invention might not have been described whole essential feature, so the present invention can also be the son combination of these described characteristics.

Description of drawings

Followingly execution mode is described with the mode of example with reference to accompanying drawing, these accompanying drawings are intended to example and are unrestricted, and unit identical in each accompanying drawing is marked with identical label, wherein:

Fig. 1 is the integrally-built block diagram of electronic equipment that the FM transmitter of embodiment of the present invention has been installed in expression.

Fig. 2 is the figure of form of the group data of expression RDS.

Fig. 3 is the circuit diagram of FM transmitter and peripheral circuit.

Embodiment

To describe the present invention based on preferred embodiment now, these preferred embodiments are not to be intended to scope of the present invention is limited, but the present invention is carried out illustration.All characteristics described in an embodiment and combination thereof might not be essential for purposes of the invention.

In this manual, so-called " state that components A is connected with part B " comprises the physically direct-connected situation of components A and part B, and the situation that is connected indirectly via the miscellaneous part that status of electrically connecting is not exerted an influence of components A and part B.

Likewise, so-called " parts C is set at the state between components A and the part B " except that components A and parts C or part B and situation that parts C directly links to each other, also comprises the situation that is connected indirectly via the miscellaneous part that status of electrically connecting is not exerted an influence.

Fig. 1 is the integrally-built block diagram of electronic equipment 200 that the FM transmitter 100 of embodiment of the present invention has been installed in expression.This electronic equipment 200 for example is portable telephone terminal, radio receiver, semiconductor storage formula audio player, has the representational role of audio frequency.Electric sound equipment conversion element itself outputs such as loud speaker that the audio signal of being reproduced can carry from electronic equipment 200 or earphone.In addition, electronic equipment 200 can also carry out frequency modulation(FM) to audio signal in order to reproduce the more audio frequency of high tone quality, sends to the outside with the mode of electric wave.The audio player of the enough outsides of user's ability receives the signal that is sent, and reproduces with higher tonequality.

The FM transmitter 100 of this execution mode can also send character data etc. except that voice data.For this reason, FM transmitter 100 generates the signal that meets RDS/RBDS with primary processor 120.In addition, " RDS/RBDS " such expression way representes it can is any one, perhaps also can be both.

Electronic equipment 200 comprises source of sound 110, primary processor 120, FM transmitter 100, antenna 112.Source of sound 110 can be same IC with primary processor 120.

Source of sound 110 output audio signal S1.For example, audio signal S1 receives broadcast wave and demodulation and the signal that obtains, also can be to reproduce to be stored in the resulting signal of data in the memory, and its generation method is not done qualification.Source of sound 110 links to each other with FM transmitter 100 bus 114 in a predefined manner.For example bus 114 is I2S buses.At this moment, between source of sound 110 and FM transmitter 100, audio signal S1 is used as serial data and transmits.

The audio signal S1 that FM transmitter 100 receives from source of sound 110.FM transmitter 100 comprises interface portion 20, stereo modulator 22, frequency modulator 24, power amplifier 26, memory 10, data generation portion 12, as function IC (Integrated Circuit: integrated circuit) integrate on a Semiconductor substrate.In addition, Fig. 1 only extracts main circuit block to represent that other circuit blocks have suitably been omitted.

The audio signal S1 that interface portion 20 receives from source of sound 110 via input terminal 102.Interface portion 20 received audio signal S1 output to stereo modulator 22.22 couples of audio signal S1 of stereo modulator apply stereo modulation, generate stereo mix signal S2.

The details of RDS/RBDS is recorded and narrated in non-patent literature 1 grade to some extent, so get final product with reference to these documents.Primary processor 120 outputs will be as the data D1 of RDS/RBDS transmission.This data D1 that will send itself is not the RDS/RBDS form, only text data.Primary processor 120 is connected with FM transmitter 100 bus 116 in a predefined manner.For example bus 116 is I2C buses.Interface portion 20 receives data D1 via bus 116, input terminal 104.Data D1 is audio signal S1 and the additional data that should send from antenna 112.In addition, preferably only should carry out sending to the data of FM transmitter 100 from the reformed timing of RDS/RBDS data (timing) that antenna 112 sends from primary processor 120.At this moment, the content of updated stored device 10 when data change only.

Memory 10 constitutes the data D1 that memory interface portion 20 is received by register etc.Under the RDS/RBDS form, same data are sent repeatedly.Primary processor 120 will be exported to FM transmitter 100 in the lump as the data of repeatedly unit.

For example, data D1 comprises

1) broadcasting office title

2) character information (Radio Text)

3) music/speech

4) program category

5) PI (program identification)

In at least a code or their combination.1) " broadcasting office title " is included in as text data in.3) data that " music/speech " expression is just being broadcasted are music or voice.4) type of data that " program category " expression is just being broadcasted.For example be set at " 0 does not have definition ", " 1 news ", " 3 physical culture ", " 14 jazz ", " 15 allusion " etc.5) PI makes the code that receives function identification country.

Data generation portion 12 suitably arranges again and is stored in the data D1 in the memory 10, generates the group data G1 that meets the RDS/RBDS form.The generation of group data G1 is that whenever predetermined timing is carried out once, for example is that every 87.6ms generates once.Therefore, group data G1 once outputs to adder 28 repeatedly by every 87.6ms.Adder 28 will be from the stereo mix signal S2 and group data G1 addition of stereo modulation device 22.Frequency modulator 24 as modulation signal, carries out frequency modulation(FM) to carrier wave with group data G1.Amplify by power amplifier 26 from the modulated signals of frequency modulator 24 outputs, output to antenna 112 via lead-out terminal 106 and not shown coupling (matting) circuit.The data that sent out by frequency modulation(FM) from antenna 112.

Fig. 2 representes the form of the group data G1 of RDS.Group data 40 (G1) are made up of 104 bits.Group data G1 is generated once by every 87.6ms, from 12 outputs of data generation portion.Group data G1 comprises four pieces 41～44.Each piece is made up of 26 bits, comprises the information word (word) 50 of 16 bits and the check word 52 of 10 bits.The information word of first piece 41 comprises the PI code.

Information word comprises 4 bits (communication (traffic)

program identification code

62,5 bits of version code 60,1 bit (TP) of group type codes 54,1 bit (B0) of A3～A0) (the program category sign indicating number 64 of PT4～PT0).

The beginning of the 2nd piece 42 of each group is allocated for the group type codes 54 of the purposes of specifying this group.Program category sign indicating number 64, communication program identification code 62 are dispensed on the precalculated position of the 2nd piece 42 of each group.

Check word comprises 10 bits, is the bit that is used for checking and correcting transmit leg, recipient the error code that transmission produces.OFFSET is that the piece that expression comprises it is the data of which piece.Check word generates by the defined pre-defined rule of standard.

The remainder data that should send is dispensed on remaining bit.Each piece can transmit the data of two characters.Every 87.6ms regularly, promptly presses with reference to primary memory 10 by whenever predetermined in the data generation portion 12 of Fig. 1, generates the group data G1 of the form that meets Fig. 2.

As above such FM transmitter 100 that constitutes has following effect.

The first, primary processor 120 needn't generate the data of RDS/RBDS form.Therefore, can continue to use primary processor in the past, as long as utilize bus (for example 12C) in the past to send the data that to send to FM transmitter 100.

The data of sending based on RDS/RBDS as stated in addition, comprise by each piece or by each to be organized by the data of sending repeatedly.Therefore; If in primary processor 120, generate the RDS/RBDS data; Then need generate by whole bits of the group data G1 that sends repeatedly, and press the data that every 87.6ms (f=1.19kHz) once sends 104 bits from primary processor 120 to FM transmitter 100 via bus 116.No matter the mode of bus 116 is how, all can consumed power via its data transmission.Therefore, for the bit that repeats by this way to send, become to resend identical data, so produced unnecessary power consumption at every turn.Different therewith, through the FM transmitter 100 of this execution mode, the data that will send send FM transmitter 100 to from primary processor 120 with being all together, and are kept in the memory 10.As a result, do not need for the second time later data to transmit, the data that can reduce repetition transmit, thereby can reduce power consumption.

And, adopt from primary processor 120 and transmit

1) broadcasting office title

2) character information

3) music/speech

4) program category

5) PI (program identification)

The structure of at least a code, and not from primary processor 120 to the data that FM transmitter 100 transfer check words etc. can generate FM transmitter 100, thus, can further reduce 120 data volumes that transmitted of FM transmitter 100 and primary processor.

In addition, primary processor 120 is handled electronic equipment 200 integral body blanketly.Therefore, if every 87.6ms generates RDS/RBDS data and sends FM transmitter 100 to, then the disposal ability of primary processor 120 is occupied, and this is undesirable.In this execution mode, can alleviate the load of primary processor 120.

In addition; Data transmission via bus 116 might produce noise; Bring bad influence for stereo modulation and frequency modulation(FM), make the characteristic variation of FM transmitter 100, but in this execution mode; The data that can reduce via bus 116 transmit number of times and data volume, so can also improve the characteristic of FM transmitter.

In addition, when primary processor 120 can generate the data of RDS/RBDS form, the common-mode of explanation below also can in FM transmitter 100, installing.

Primary processor 120 portion within it generates the data of RDS/RBDS form, and exports to FM transmitter 100 via bus 116.The data of the RDS/RBDS form of this moment do not comprise check word.12 pairs of additional check words of data from the next RDS/RBDS form of primary processor 120 receptions of data generation portion are exported to adder 28.

If common-mode is installed, then can send the various data beyond the above-mentioned data.In addition, though send the data that 87.6ms regularly produces once via bus 116 and transmit by every, because transfer check data not, so can reduce consumed power.

Next, explain and used the automatic channel selecting technique RDS/RBDS data, adjustment FM transmitter 100 and receiver.The automatic channel selecting technique of this execution mode can use above-mentioned FM transmitter 100, also can use other technologies.Below, be that prerequisite describes with FM transmitter shown in Figure 1 100.

The technical characterictic of RDS/RBDS is that receiver can utilize predetermined data items (the following code that also the abbreviates as) retrieval of harmonizing.That is, in receivers such as radio tuner, the user is to certain code, after for example " program category " set predetermined value " news ", and receiver can all band ground scanning broadcast wave, obtains the RDS/RBDS data of the channel of broadcasting and decodes.Decoded results is that program category comprises the channel of predetermined value " news " and selected automatically.When having a plurality of channel, the user can select any channel.

Specify the automatic channel selecting technique of this execution mode below.

12 pairs in the data generation portion of Fig. 1 can set predetermined value as the data items (keyword of retrieval of harmonizing) of channel selection benchmark the recipient, generates the data of RDS/RBDS form.The group data G1 of the RDS/RBDS form that frequency modulator 24 will be generated by data generation portion 12 and carry out together exporting after the frequency modulation(FM) from the stereo mix signal S2 of stereo modulator 22.

For example, the preference data project is " program category ".The value of program category can have 32 kinds of settings of " 0 no program category " to " 31 alarm ".Can by user's given settings of electronic equipment 200 which value preferably.At this moment, obtain the value of the specified program category of user via user interface (not shown) by primary processor 120.Primary processor 120 is exported the value of the program category of user's appointment as data D1.This program category code is written into memory 10, the data that data generation portion 12 can generate based on user's designated value.

In addition, as other execution modes, program category also can be in the preset FM transmitter 100.

Also can irrespectively set program category with the kind of the data of sending from FM transmitter 100.That is, when the audio signal of being sent was " rock and roll ", the value of the program category that the user sets was that " news " is also out of question.

In addition, also can replace program category and adopt " music/speech " code.At this moment, as value, set " music " perhaps any one of " voice ".In this case, also can irrespectively set the music/speech code with the kind of the data of being sent from FM transmitter 100.

Under common user mode, the user of electronic equipment 200 is identical with the user of radio tuner (receiver).Therefore, the user knows the value of in FM transmitter 100, setting as program category, so can this value be set at the program category of receiver.

That is, in the automatic channel selection method of this execution mode, handle below carrying out.

At first, in FM transmitter 100,

(1) data items (program category, music/speech) that can in receiver, be set at the RDS/RBDS of channel selection benchmark is set predetermined value.Handling main body is primary processor 120, data generation portion 12.

(2) generate the data that data items is set to the RDS/RBDS form of predetermined value.Handling main body is data generation portion 12.

(3) data of RDS/RBDS form are carried out exporting after the frequency modulation(FM).Handling main body is frequency modulator 24.

In addition, in receiver,

(A) receive electric wave, the data of RDS/RBDS form are decoded, extract the channel that data items has predetermined value, carry out tuning.

Through the automatic channel selecting technique of this execution mode, in receiver, program category has the channel of the predetermined value that sets by channel selection automatically.Send the RDS/RBDS data that program category has this predetermined value from FM transmitter 100.Therefore, the user can not realize tuning to the transmission frequency ground of receiver input FM transmitter 100.

In addition, when having extracted a plurality of channel, the user therefrom selects the channel of FM transmitter 100 to get final product.Because with having the situation of equal values and few as program category in the program of constantly being broadcasted, thus the user from two or three channels, select to get final product at the most, so compare channel selection easily with the situation of own setpoint frequency.

In other transmitters outside the FM of this execution mode transmitter 100, general program category is set to " 0 no program category ".Perhaps, the value of program category possibly be the data that meet the content of the signal that sends from FM transmitter 100.Different therewith, in this execution mode, can be on one's own initiative the value of program category be set at certain value, and uses it for automatic channel selection, also can be described as a characteristic in this.

Describe the present invention based on execution mode, but execution mode only is expression principle of the present invention, application, in the scope of the thought of the present invention that does not break away from claims defined, the change that can much be out of shape and dispose execution mode.

In the FM of execution mode transmitter 100, be that the FM transmitter 100 with Fig. 1 is that prerequisite describes, but be not limited to this about the present invention of automatic channel selection.That is, also can be that primary processor 120 itself generates the RDS/RBDS data, every 87.6ms sends once to FM transmitter 100.In this case, the modulated signals that the data items that sends the adjustment searching object from antenna 112 has predetermined value is so can carry out automatic channel selection.

Fig. 3 is the circuit diagram of FM transmitter 100 and peripheral circuit.The IC of FM transmitter 100 has pin～No. 28 pin No. 1.

No. 1 pin, No. 2 pins, No. 7 pins, No. 8 pins, No. 27 pins are provided supply voltage VCC, earthed voltage GND to the analog circuit in the FM transmitter 100.12,13, No. 23 pins are provided supply voltage VDD, earthed voltage GND to digital circuit.

Biasing circuit (BIAS) 326 generates bias voltage, offers each circuit block of FM transmitter.Bias voltage carries out smoothing by the capacitor that links to each other with No. 3 pins.

Adjuster (REG) 304 generates the employed voltage of internal logic of FM transmitter 100.From the voltage of No. 11 pin output by adjuster 304 generations.

19～No. 21 pin connects source of sound 110 via the I2S bus.No. 19 pins are pins that data are used, and No. 20 pins are pins that clock is used, and No. 21 pins are pins that the LR clock is used.I2S bus interface oral area 306 and source of sound 110 transceive data.

17, No. 18 pins connect primary processor 120 via the I2C bus.No. 17 pins are pins that clock signal is used, and No. 18 pins are pins that data-signal is used.

No. 15 pins, No. 16 pins are connected with crystal vibrator 344.Oscillator 302 provides system clock.

No. 14 pin is transfused to chip enable signal.Through chip enable signal, FM transmitter 100 switches the pattern and the energy-saving mode (power down mode) of work usually.Under energy-saving mode, internal circuit is closed, and current sinking almost becomes 0, becomes the state that does not receive the signal that comes the outside.

No. 22 pins are transfused to address of devices and select signal.Be when except that FM transmitter 100, also having the LSI that controls with common I2C bus, they establish in order to distinguish.

No. 24 pins are that terminal is used in test.

No. 25 pins are that RDS is with triggering lead-out terminal.RDS digital modulator (RDS) 312 will send this situation of RDS signal to FM transmitter 100 from the outside and notify to the circuit block beyond the FM transmitter 100 via No. 25 pins.

Stereo modulator 310 receives from source of sound 110 and receives the audio signal of coming, and it is carried out stereo modulation, generates the stereo mix signal.RDS digital modulator 312 reads out the data from primary processor 120 successively, carries out two-phase phase shift (Binary Phase Shift) modulation, exports after the filtering.Adder 314 will be from the RDS/RBDS data and the stereo mix signal plus of RDS digital modulator 312 outputs.

DAC316 carries out digital-to-analogue conversion to the output of adder 314.By the amplitude of the 318 adjusting DAC316 of modulation degree adjusting portion (MODADJ), offer PLL322 via No. 5 pins, outside capacitor C100, No. 6 pins.No. 6 pin is connected with recursive filter (LOOP FIL) 324 with No. 4 pins (PLL time constant switched terminal) via capacitor C102.Through the inner not shown resistance of the capacitor C102 that is connected with No. 4 pins and FM transmitter 100, form recursive filter 324, according to being to change the capacitance of capacitor C102 or changing resistance value regulates time constant.

VCO320 by with from the vibration of the signal correspondent frequency of PLL, the signal after the FM modulation is offered distributor (divider) (DIV) 328.VCO320 connects variable capacitance diode and inductor via 9, No. 10 pins.

FM transmitter 100 has the power amplifier of two systems.Distributor 328 is to power amplifier 330,332 output signals.The output of power amplifier 330 outputs to the outside from No. 26 pins.No. 26 pin is connected with match circuit 340.The output of power amplifier 332 outputs to the outside from No. 28 pins.No. 28 pin is connected with match circuit 342.Through power amplifier and the match circuit that designs two systems, can come the regulating frequency characteristic according to the load (antenna) of each system.

The corresponding relation of Fig. 1 and Fig. 3 is as follows.

Interface portion 20: interface portion 306,308

Stereo modulator 22: stereo modulator 310

The data generation 12:RDS312 of portion

Adder 28: adder 314

Frequency modulator 24:DAC316, modulation degree adjusting portion 318, recursive filter 324, PLL322, VCO320

Power amplifier 26: distributor 328, power amplifier 330,332

In addition, following problem and the method that solves it are disclosed in this specification.

If it is, then can utilize this data, convenient in receiver side except that from the data that can also in the electric wave that sends by the FM transmitter, load the RDS/RBDS form the broadcast wave of broadcasting office.Therefore, according to an execution mode, a kind of FM transmitter that can send the data of RDS/RBDS form is provided.

A scheme of the present invention relates to the FM transmitter that can send the signal that meets RDS (Radio Data System) or RBDS (Radio Broadcast Data System) form.This FM transmitter comprises: interface portion, via predetermined bus from the primary processor of outside receive the data that will send; Memory, the data that memory interface portion is received; Data generation portion utilizes to be stored in the data in the memory, generates the group data that meet form; Frequency modulator carries out frequency modulation(FM) and output to the group data that generated by data generation portion.

According to this scheme, primary processor need not be managed the form of RDS/RBDS, only generates the data that will send and gets final product via bus output.In addition, in RDS/RBDS, send identical data sometimes repeatedly, but only once get final product, can reduce the consumed power of circuit from the data transmission of primary processor to the FM transmitter.

The data that will send that interface portion received can comprise " broadcasting office title ", " RT (RadioText :) ", " music/speech (Music/speech) ", " program category ", " PI (program identification) " to call character information in the following text at least any one.

Also can under common-mode, work, said common-mode is to be received in the RDS that generates in the primary processor or the data of RBDS form, to exporting behind its additional check word.

At this moment, under FM transmitter and situation that the primary processor of the data that can generate the RDS/RBDS form is connected, can effectively utilize the data that generate by primary processor.

The FM transmitter of a scheme also can be integrated on a Semiconductor substrate.So-called " integrating " comprises that all structural elements of circuit all are formed on the situation on the Semiconductor substrate; With the situation that the primary structure key element of circuit is integrated, can also a part of resistance, capacitor etc. be arranged on the outside of Semiconductor substrate for the regulating circuit constant.Through these circuit being integrated into a LSI, can reduce circuit area.

Another program of the present invention is an electronic equipment.This electronic equipment comprises: primary processor generates the additional data beyond the audio signal; Above-mentioned any FM transmitter is connected with primary processor via predetermined bus, is transformed into RDS or RBDS form behind the reception additional data, carries out exporting after the frequency modulation(FM).

According to this scheme, can reduce the number of times of the data transmit-receive of primary processor and electric room, so can reduce the consumed power of electronic equipment.

Although used particular term to describe the preferred embodiments of the present invention, this description only is used for illustrative purposes, and be to be understood that into, under the situation of essence that does not depart from accompanying claims and scope, can make amendment and change.

Claims

1. the FM transmitter that can send the signal that meets RDS (Radio Data System) or RBDS (Radio BroadcastData System) form is characterized in that, comprising:

Data generation portion to setting predetermined value as the data items of channel selection benchmark the recipient, generates the data of RDS/RBDS form;

Stereo modulator applies stereo modulation to audio signal, generates the stereo mix signal;

Adder, the data and the above-mentioned stereo mix signal plus that will generate by above-mentioned data generation portion; With

Frequency modulator carries out frequency modulation(FM) and output to the output of above-mentioned adder.

2. FM transmitter according to claim 1 is characterized in that,

Above-mentioned data items is a program category.

3. FM transmitter according to claim 2 is characterized in that:

Above-mentioned program category is that the kind with the data of sending from the FM transmitter irrespectively is set.

4. FM transmitter according to claim 1 is characterized in that:

Above-mentioned data items is the music/speech code.

5. FM transmitter according to claim 4 is characterized in that:

Above-mentioned music/speech code is that the kind with the data of sending from the FM transmitter irrespectively is set.

6. FM transmitter according to claim 1 is characterized in that:

Above-mentioned data generation portion is according to the above-mentioned predetermined value of user's given settings.

7. FM transmitter according to claim 1 is characterized in that:

Integrated on a Semiconductor substrate.

8. an electronic equipment is characterized in that, comprising:

The described FM transmitter of claim 1; With

Primary processor links to each other with above-mentioned FM transmitter via predetermined bus, obtains the specified above-mentioned predetermined value of user, sends above-mentioned FM transmitter to;

Wherein, above-mentioned FM transmitter is set the specified above-mentioned predetermined value of above-mentioned user to above-mentioned data items.