Double Talk Research Articles

A DSP-based lattice-pole-zero acoustic ECHO canceller

In this paper, a practical pole-zero lattice adaptive acoustic echo canceller (AEC) for hands-free telephone is proposed. The proposed algorithm consists in two parts: forward lattice and inverse lattice. Collectively, they are referred to as LATIN (Lattice and Inverse Lattice) configuration. While the forward lattice is responsible for acoustic echo cancellation, the inverse lattice is employed in the double-talk (DT) mode only as to undo the distortion of the near-end speech brought about by the forward lattice filter when suppressing the acoustic echo. Assuming M poles and M zeros for the proposed AEC, the complexity of the proposed algorithm is approximately twice the complexity of an M-tap FIR gradient lattice algorithm. Real-time experimentation conducted on a floating-point DSP chip and simulation results attest to the stability, fast convergence, and high acoustic echo suppression of the proposed pole-zero algorithm.

The echo shaping approach to acoustic echo control

This paper describes and analyses algorithms for hands-free telephony which use an acoustic echo canceller combined with an additional FIR filter in the sending path of the hands-free telephone. We describe two different methods to adapt the additional FIR filter (called “the echo shaping filter”) which are highly effective and easy to implement. It is shown that these algorithms allow to reduce the order of the compensator significantly and still provide high echo attenuation and only little distortions of the near speech signal during double talk.

An Adaptive Acoustic Echo Canceler for Hands-Free Teleconferencing

Porayath, R., Doherty, J. F., and Russell, S. F., An Adaptive Acoustic Echo Canceler for Hands-Free Teleconferencing,Digital Signal Processing6(1996), 29–36.A new technique for high quality acoustic echo cancellation in teleconference and speaker phone systems has been developed. The new echo canceler is based on an enhanced adaptive filtering algorithm and uses a spread-spectrum-based technique to mitigate the effects of double talk. The test facility used to develop this new acoustic echo canceler and the system design of echo canceler are described.

Scripts, Talk and Double Talk

This paper is about the role of talk in the creation, development and instating of a new script within an organization. For a long time I have been interested in how we recognize the patterns of behaviour that we have become accustomed to, how we sustain them and how, if we so choose, we modify them. Elsewhere I have made extensive use of the metaphor of the theatre in characterizing these processes, depicting the social world we inhabit as a place of settings, scenes, acts and scripts and ourselves as dramatists/dramaturges, performers, audiences and critics (Mangham, 1978, 1987, 1988; Mangham and Overington, 1986). In my work with members of organizations, I have utilized this frame to invite them to step back from their own performances, appraise them, rewrite them, try out the new scripts and work towards a long run of their new creations. Here I report on the role of talk in one such intervention.

Double Talk: Andrei Siniavskii's Dissertation

Double Talk: Andrei Siniavskii's Dissertation

Comments on Lipski's Review of Double Talk

Comments on Lipski's Review of Double Talk

Double Talk: Asturias's America in Cuculcán

Double Talk: Asturias's America in Cuculcán

Not in heaven: coherence and complexity in biblical narrative

Acknowledgments Introduction Jason P. Rosenblatt and Joseph C. Sitterson, Jr. Biblical Imperatives and Literary Play Robert Alter Double Cave, Double Talk: The Indirections of Biblical Dialogue Meir Sternberg Princely Characters James C. Nohrnberg Understanding the Bread: Disruption and Aggregation, Secrecy and Revelation in MarkOs Gospel Joh Drury Literary Exegesis of Biblical Narrative: Between Poetics and Hermeneutics Adele Berlin The Right Chorale: From the Poetics to the Hermeneutics of the Hebrew Bible Bernard M. Levinson The Integrity of Biblical Pluralism James A. Sanders Genesis 22: The Sacrifice of Sarah Phyllis Trible The Histories of David: Biblical Scholarship and Biblical Stories Regina M. Schwartz Esther Passes: Chiasm, Lex Talio, and Money in the Book of Esther William T. McBride Notes Contributors

Woolard, K. (1989). Double Talk. Bilingualism and the Politics of Ethnicity in Catalonia

Ressenya de l'obra de K. Woolard apareguda el 1989, Double Talk. Bilingualism and the Politics of Ethnicity in Catalonia. California: Stanford University Press.

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia

Double talk: Bilingualism and the politics of ethnicity in Catalonia By Kathryn A. Woolard (review)

Double talk: Bilingualism and the politics of ethnicity in Catalonia By Kathryn A. Woolard (review)

Not Available

Double talk: The Twins and Multiple Births Association last week launched a new twinline' telephone listening service for parents who are feeling under stress.

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia. Kathryn A. Woolard. Stanford: Stanford University Press, 1989. 183 pp. $29.50 (cloth

Kathryn A. Woolard, Double talk: Bilingualism and the politics of ethnicity in Catalonia. Stanford, CA: Stanford University Press, 1989, Pp. xiv + 18

Kathryn A. Woolard, Double talk: Bilingualism and the politics of ethnicity in Catalonia. Stanford, CA: Stanford University Press, 1989, Pp. xiv + 18

Full‐duplex speakerphone with acoustic and line echo cancelers

In this paper, a complete speakerphone is implemented with an AT&T WE DSP16A microprocessor. This single chip implementation has the advantage of low cost and hence can be applied to the speakerphone installed in a small conference room or a hands‐free cellular phone. A robust speech detector is developed to classify four different operation modes; a corresponding gain regulation algorithm is then applied to guarantee the stability of local acoustic and electronic loop. More specifically, it reduces signal levels on both channels when in idle mode, freezes acoustic (or line) echo canceler during the transmit (or receive) mode, and freezes both echo cancelers when double talk mode occurs. The performance of the system is evaluated by computer simulation and tested by real time experiment.

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia. KATHRYN A. WOOLARD

<i>Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia.</i> KATHRYN A. WOOLARD

Diglossie et double langage. Langues et langages d'honneur en Grèce

Couroucli Maria - "Diglossia and double talk. Languages and speech about honour in Greece". Linguistic situation of modern Greece is characterised as diglossia: coexistence of a highly dialectalised "folk" language (dimotiki) and of a "purified" language (katharevousa), which is both official and written. Some speech habits involving demotics are transcribed-translated into katharevousa within official reports. So, by analysing the records of hearings of a county court in Crete, one can display those moments when folk language irrupts into the translation, in relation with the latent conflict between official law and customary law. An anthropological study of "crimes of honour" and of their proceeding within the universe of modern law can be derived, and shows the mediating role of the popular jury.

`Boy!': The Hinge of Colonial Double Talk

The French colonial enterprise in Africa enforced racial segregation, yet encouraged Africans to assimilate the French language, culture, and religion. The essay questions these contradictory policies through readings of Ferdinand Oyono's novels. It argues that a figure that embodies undecidability—the colonial servant known as the "boy"—is the locus of the denaturalization of the identities that were simultaneously institutionalized and denied by the Manichaean colonial world.

: Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia . Kathryn A. Woolard.

: Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia . Kathryn A. Woolard.

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia.

Double Talk: Bilingualism and the Politics of Ethnicity in Catalonia.