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Readbag users suggest that Special Information Tones is worth reading. The file contains 3 page(s) and is free to view, download or print.

Dial tone; Ringtone; Ringback tone; Busy signal; Reorder tone; Disconnect tone; Special information tones; Off-hook tone; Dual-tone multi-frequency; 2600 Hz

Check out some special information tones. LifeHacker cited the "Vacant Circuit" tone as causing a disconnect for auto-dialers. Putting that at the…

Automated phone bots keep interrupting your dinner with their pre-recorded marketing messages? Play the U.S. Special Information Tone signal for "vacant…

Definitions of Special information tones, synonyms, antonyms, derivatives of Special information tones, analogical dictionary of Special information tones (English)

special information tone In Short Description : special information tone In Long Description: Full DVD Ripper Pro 9.3 Adjust the image brightness/ contrast…

Special Information Tones IC – Intercept – Number changed or number disconnected, FTC Robocall Challenge: Consumer Tips & Tricks, A special frequency, a mini "cure…

Using Special Information Tones to Foil Telemarketers!; used by most.telemarketers will take you off their list after hearing these tones.

In telephony, a special information tone is an in-band international standard signal consisting of three rising tones indicating a call has failed.

Special Information Tones and Telemarketing Predictive Dialers are machines used by telemarketing firms to place many telephone calls at a rapid rate.

Special information tones; Off-hook tone; Dual-tone multi-frequency; 2600 Hz; Read in another language. Last edited on 23 August 2015, at 03:09…

Spanish Translation, Synonyms, Definitions and Usage Examples of English Word 'send special information tones'

LINESPECIALINFO_ Constants; Special information tones are defined for advisory messages and are not normally used for billing or supervisory purpose. Requirements.

U.S. SIT (Special Information Tones) signal: Vacant Circuit. out of service or nonexistent phone number. Added: 11/30/08 From…

Special Information Tones (SIT) [link to www.yourhomenow.com] Record these three musical notes (play this WAV file) as the very first part of your telephone answering…

SIT (Special Information Tones) SIT's are the three sequential tones usually followed by a recording like "We're sorry, your call did not go through as…

The high-order 16 bits can be assigned for device-specific extensions. The low-order 16 bits are reserved. Special information tones are defined for advisory messages…

A method and apparatus (10) for returning a false signal substantially similar to at least a first portion of a special information tone (SIT) after a device…

Precise Call Progress and Special Information Tone Generator 1 Features; detector for call progress and special information tones (SIT), as defined by CCITT.

The Telezapper can emit a 'disconnect' tone when your phone line goes off-hook; You can get a set of all three Special Information Tones from Private Citizen.

CMX882 – Baseband Processor IC with GPS Data Signalling for FRS, MURS, PMR446 and; to handle FSK, DTMF, Call Progress and Special Information Tones…

System and method for privacy screening with special information tones Abstract. A system and method delivers an audible tone to an unidentified caller who places a…

MX643P datasheet, MX643P pdf, MX643P data sheet, datasheet, data sheet, pdf, MXCOM, Call progress tone detector with special information tones (SIT)

System and method for privacy screening with special information tones. United States Patent 7079638. Abstract: A system and method…

SIT tones are the "Special Information Tones" that are used in the telecommunications industry to facilitate the communication of a message to a computer or similar…

Video

Dial-Normal Transmission Signal

The Dial-Normal Transmission Signal is a second dial tone returned to an operator between digits indicating that he/she may dial the remainder of the number. For example, when an operator reaches a link-type Community Dial Office via a step-by-step office after dialing a routing code, he/she must pause until an idle link at the Community Dial Office returns dial tone. This method of operation is not recommended or considered standard.

Dial-Normal Transmission Signal is a steady Low Tone.

Output Transformer Saturation

An undersized output transformer can be saturated (maxed out) by the guitar signal coming off the power tube plates. When this happens the loudest passages will be capped causing compression. This dynamic compression can add to the character of an amp by adding note bloom and sustain. This tends to make an amp sound more round and tubey and less sterile. A smaller output transformer can help a modern amp sound more vintage. Most high gain amps do not use undersized transformers.

A "right sized" or oversized output transformer will let you get the maximum volume out of your amp and enhance dynamics, especially the low end.

Line Busy Tone

The Line Busy Tone indicates that the called customer’s line has been reached but that it is busy, being rung, or on permanent signal. When an operator applies a line busy signal, it is sometimes called a busy-back tone.

Line Busy Tone is a Low Tone that is on and off every .5 seconds.

Intentional Phase Inverter Mismatch

Howard Dumble added a phase inverter balance control to his Tweedle Dee tweed Deluxe amplifier. The control allows intentional mismatch between the two phase inverter output signals which generates sweet sounding even order harmonic distortion and intermodulation distortion to fatten up the amp’s tone. Anytime harmonic distortion is created intermodulation is also created. The phase inverter balance control lets you thicken your clean tone but also maintain control when pushing the amp hard into overdrive.

The Baxandall Tone Control Circuit

The circuit discussed here is an example of the Ba

The circuit discussed here is an example of the Baxandall tone control circuit, illustrated in Fig. 4.2.2, which is an analogue circuit providing independent control of bass and treble frequencies; both bass and treble can be boosted or cut and with both controls at their mid positions, provides a relatively flat frequency response, as illustrated by the blue ‘Level response’ graph line in Fig. 4.2.5. The original design, proposed by P. J. Baxandall in 1952, used a valve (tube) amplifier and feedback as part of the circuit to reduce the considerable attenuation (about −20dB) introduced by the passive network, and to provide true bass and treble boost. There are still many variants of the circuit in use, both as active circuits (with amplification as originally proposed), and as passive networks without an incorporated amplifier. In passive variants of the Baxandall circuit, extra stages of amplification may be used to make up for the approximately −20bB attenuation caused by the circuit.

Read the original 1952 paper “Negative-Feedback Tone Control” by P. J. Baxandall B.Sc.(Eng.) published in “Wireless World” (Now Electronics World)

5# Classic Low noise Pre Tone control circuit using 3 transistors

See image below, the preamplifier tone control circuit diagram of the home audio stereo is very well. It low noise and sound is beautiful. Because using the quality transistors.

 The Schematic Diagram of Mono Classic Preamplifie

The Schematic Diagram of Mono Classic Preamplifier Tone control using 3 transistors

It has three transistors, C945 ( Equivalents of C829 , C1815 or C458). They are old electronic components but useful now.

This circuit is the Mono form, if you want stereo system. You need to make 2 channel R+L.

The VR1 is 100kB for adjusting the treble tone sound. The VR2 is 100K for adjusting the bass tone audio as well.

The VR3 is 100Ka for control volume output. The VR4 is 100KW for control balane sound fo other channel.

The power Supply Voltage used min 12V and min than 10mA. We hope this circuit will do you are enjoying home audio. Good luck.

How to build

You may build this project on universal PCB or Perforated PCB. Or if you want to make a PCB. See below!

PCB layout of 3 transistor Pre tone control projec
PCB layout of 3 transistor Pre tone control project

The PCB layout of Classic Tone control using 3 Low noise transistors  

And Here is wiring and assembly guide below.

Components list

Resistors ¼ watts +5%

  • R1, R8: 22K
  • R2, R3: 47K
  • R4: 68K
  • R5, R10: 1.5K
  • R6, R9: 220K
  • R7: 5.6K
  • R8:22K
  • R11, R13, R15: 10K
  • R12, R17: 330K
  • R14: 4.7K
  • R18: 3.3K
  • R19: 5.6K
  • R20: 2.7K
  • R21: 100K

Potentiometers

  • VR3: 100K(A) Dual Audio Potentiometer
  • VR1, VR2: 100K(B) Dual Audio Potentiometer
  • VR4: 100K (MN) Bal Audio Potentiometer

Capacitors

  • C1: 0.22μF Ceramic or Mylar
  • C2, C12: 47pF 50V Ceramic
  • C3, C13: 47μF 25V Electrolytic
  • C4, C10, C11: 10μF 25V Electrolytic
  • C5: 470μF 25V Electrolytic
  • C6: 33μF 25V Electrolytic
  • C7: 0.0015μF 50V Ceramic or Mylar
  • C8,C9: 0.047μF 50V Ceramic or Mylar
  • C14: 3.3μF 25V Electrolytic

Semiconductor

  • Q1, Q2, Q3: 2SC945 or 2SC1815, 2SC828 NPN transistors
  • Other PCB, jacks RCA, jack DC, adapter, etc.

Call States

Table 1. Analyzer Event Sequences

Event

Purpose

Next Event Expected: Y= Accepted, N= Not Accepted

new

ivr-

conn

ected

ivr-

done

parked

connect

conn

ected

on-

hold

hold-

done

consu

lting

consu

lt-done

confer

encing

confe

rence-

done

ended

recor

ding-

started

transf

erred

monit

oring-

reque

sted

moni

toring-

started

moni

toring-

ended

wrapup

-done

update

-csr-attr

ibutes

no

contact

No interaction

with the customer

Y N N N N N N N N N N N N N N N N N N

new

New interaction

starts with the

customers

N Y Y Y Y N Y Y N N N Y N N N N N N Y

ivr-

connected

ivr instance

is connected

N N Y N N N N N N N N N N N N N N N Y

ivr-

done

ivr instance

is completed

N Y N Y Y N N N N N N Y Y N N N N N Y

parked

Call is kept in

parked state

N Y Y Y Y N N N N N N Y Y N N N N N Y

connect

New call starts

with the

customer

N N N Y Y N N N N N N Y Y N N N N N Y

connected

Call in-progress

with the customer

N N N N N Y N N N Y N Y Y Y Y N N Y Y

on-hold

Call is on-hold

with the customer

Y N N Y Y N Y Y N Y N Y N Y N N N Y Y

hold-done

Call is put

back to in-progress

state from on-hold state

Y N N N N Y N N N Y N Y Y Y Y N N Y Y

consulting

Call is put in

consulting state

N N N N N N N N Y Y N N N Y N N N Y Y

consu

lt-done

Call is put back to

in-progress state

from consulting state

N N N Y Y N Y Y N Y N Y N Y N N N Y Y

confer

encing

Call is put in

conference state

N N N N N N N N N Y Y N N N N N N Y Y

confer

ence-done

Call is put back to

in-progress state from

conference state

N N N N N N Y N N N N Y N Y N N N Y Y

ended

Call with the

customer is ended

N N N N N N N N N N N N N N N N N Y Y

recor

ding-

started

Call reco

rding started

N N N Y Y N N N N N N N N N N N N N Y

transf

erred

Call is trans

ferred

N N N N Y N N N N N N Y N N N N N Y Y

moni

toring

-reque

sted

Call monitoring

is requested

N N N N Y Y Y Y Y Y Y Y Y Y N Y N N Y

moni

toring-

started

Call monitoring

is started

N N N N Y Y Y Y Y Y Y Y Y Y N N Y N Y

moni

toring-

done

Call monitoring

is ended

N N N N Y Y Y Y Y Y Y Y Y Y Y Y Y N Y

wrap

-up done

Wrapup done by

the agent

N N N N Y N N N N N N N N N N N N Y Y

update

-csr-attri

butes

update

csr-attr

ibutes

N Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y

Note

Flow Developer uses the Flow Designer UI to create and publish call control scripts to manage the inbound telephony contacts. The administrator maps the published flow scripts against the routing strategy. When an inbound call lands at the entry point, the flow control engine identifies the routing strategy and executes the corresponding flow script, invoking the individual flow control activities that are part of the flow script.

v.21

  • Data transmission may take place at low data signalling rates on telephone calls set up on switched telephone circuits (or on leased telephone circuits).
  • The communication circuit for data transmission is a duplex circuit whereby data transmission in both directions simultaneously is possible at 300 bit/s or less. The modulation is a binary modulation obtained by frequency shift, resulting in a modulation rate being equal to the data signalling rate.
  • The nominal characteristic frequencies; channel №1 (FA = 1180 Hz and Fz = 980 Hz) channel №2 (FA = 1850 Hz and Fz= 1650 Hz)

Tone Options

There is a Dialogic option for each type of tone, that the Genesys configuration environment recognizes. These tone options are as follows:

  • busy-tone-1
  • busy-tone-2
  • disconnect-tone
  • extra-dial-tone
  • fax-tone-1
  • fax-tone-2
  • forth-tone
  • intl-dial-tone
  • local-dial-tone
  • ring-back-tone-1
  • ring-back-tone-2
  • sit-tone

Tone Parameters provides more details about each of these tone options.

CNG Calling Tone

To indicate a calling non-speech terminal or that the terminal is in the transmit mode, it shall transmit a continuous 1100 Hz ± 38 Hz tone for a duration of 0.5 second ON and 3 seconds OFF ± 15%.

Active Baxandall Circuit

To overcome the substantial losses in the passive version of this circuit, which give a level response (with both controls at mid way setting) but at -20dB below the input voltage, it is common to incorporate an amplifier in the designs. Nowadays an op-amp would be a reasonable choice, with the Baxandall network forming a negative feedback loop to give the required gain figures over the necessary bandwidth. Various designs are possible with different values for resistors R1 to R4 and C1 to C4 in the network, depending to some extent on the output impedance of the previous, and input impedance of the following circuits.

With active circuits such as that shown in Fig. 4.2.6 the aim is to have the level response at 0dB so there is no gain and no loss due to the tone control circuit. The maximum amount of boost possible should not be sufficient to overload any stage following the tone control if distortion is to be avoided. The design of such control circuits is usually therefore, an integral part of the overall design of an amplifier system.

7# High-quality Tone Control Mono using 5 Transist

7# High-quality Tone Control Mono using 5 Transistors C945

Imagine you are listening to a very beautiful song. You hear every detail of the instrument, clear voice Softly. You can stay with it all day long.

This circuit may be the best choice for you. It is a high gain of preamplifier tone control circuit using 5 transistors.

Look at the circuit diagram.

Circuit Diagram of High-quality Tone Control Mono

Circuit Diagram of High-quality Tone Control Mono using 5 Transistors C945

A Designer adds a preamplifier section. It consists of transistor Q1, R1-R6, C1, and C2. It gives this circuit a higher gain, can get tiny low-level audio signals of about 1mV. While still responding to sound frequencies as well and has low distortion.

Other details Still the same as the three transistors pre tone control circuit (previous circuit).

Also, See in the circuit is mono form. If you want a stereo. You need to build other one.

We can use many number of NPN transistors like C945 or C1815 or C828. The pin configuration is the same.

Making this project

I have built this project and found that the strength and sound quality are good when compared with IC op-amp circuits.

But to build this project requires high neat. Because it uses a lot of components.

Also, you can use perforated PCB. Or make a normal PCB.

PCB layout of 5 transistors High quality Pre tone
PCB layout of 5 transistors High quality Pre tone control circuit

Then assemble all parts on PCB as layout below.

Components layout of 5 transistors Pre tone contro
Components layout of 5 transistors Pre tone control Project

And see Wiring and assembly guide of this project.

Wiring layout
Wiring layout

Download This

All full-size images of this post are in this Ebook: Elec Circuit vol. 2 below. Please support me. 🙂

Components list

Resistors ¼ watts +5%

  • R1, R13, R25: 2.2K
  • R2: 220K
  • R3: 56K
  • R4, R8: 82K
  • R5: 27Ω
  • R6: 3.9K
  • R7: 100K
  • R9: 15K
  • R10: 2K
  • R11: 12K
  • R12: 10K
  • R14: 180Ω
  • R15: 3.9K
  • R16, R18, R24: 3.3K
  • R17, R28: 22K
  • R19, R27, R29: 220Ω
  • R20, R22: 18K
  • R21: 47K
  • R23: 330Ω
  • R26: 620Ω

Potentiometers

  • VR1: 50K(A) Dual Audio Potentiometer
  • VR2, VR3: 50K(B) Dual Audio Potentiometer
  • VR4: 100K (MN) Bal Audio Potentiometer

Capacitors

  • C1: 1μF 50V Electrolytic
  • C2: 0.01μF Ceramic or Mylar
  • C3, C5, C7, C15: 22μF 25V Electrolytic
  • C4, C6, C13, C14, C16: 10μF 25V Electrolytic
  • C8: 1000μF 25V Electrolytic
  • C9, C10: 0.1μF 50V Ceramic or Mylar
  • C11: 0.001μF 50V Ceramic or Mylar
  • C12: 220pF 50V Ceramic

Semiconductor

  • Q1, Q2, Q4, Q5: 2SC945 or 2SC1815, 2SC828 NPN transistors, or better read below.
  • Q3: 2SA561 PNP transistor or better read below.
  • Other PCB, jacks RCA, jack DC, adapter, etc.

Alternate Of C945 and A561 Transistor

If you cannot find the transistors. You can use alternate transistors. But Its pin configuration is different see in the diagram below before replacing in the circuits.C945: 2N3904, BC547A561: 2N3906, BC557

Its performance is similar. May be higher as well

Its performance is similar. May be higher as well Because it has more collector current (IC) and higher frequency response.

18V Regulator circuit

These classic pre-tone control circuits (Circuit 1, 2, 5, 6, and 7) require a 12V to 24V DC power supply. Since they use low current. But it should be a DC regulator circuit only. I recommended this circuit below.

It is a series voltage regulator using Zener and t

It is a series voltage regulator using Zener and transistor. So easy and cheap. However, they are enough for our pre-tone control circuits.

Here is PCB layout and components layout.

PCB layout 18V regulator

Components layout of 18V regulator

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